Title of Invention	"A LEVER-TYPE CONNECTOR"
Abstract	A lever-type connector, comprising: a housing (1) connectable with a mating housing (2), a lever (3) rotatably provided in or on the housing (1) and having a cam member (12) formed in at least one side surface thereof, the cam member (12) being engageable with a mating cam member (11) provided in or on the mating housing (3) to display a cam action to perform or assist a connection of the housing (1) with the mating housing (2), wherein the housing (1) is formed with at least one rotation supporting portion (24) having a clearance that can be widened as the lever (3) is assembled and is narrowed after the lever (3) is assembled, so that the rotation supporting portion (24) rotatably supports a central part of rotation of the lever (3) by holding the lever (3) substantially in thickness direction (TD), characterized in that the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction (AD) of the lever (3).

Title of Invention

"A LEVER-TYPE CONNECTOR"

Abstract

A lever-type connector, comprising: a housing (1) connectable with a mating housing (2), a lever (3) rotatably provided in or on the housing (1) and having a cam member (12) formed in at least one side surface thereof, the cam member (12) being engageable with a mating cam member (11) provided in or on the mating housing (3) to display a cam action to perform or assist a connection of the housing (1) with the mating housing (2), wherein the housing (1) is formed with at least one rotation supporting portion (24) having a clearance that can be widened as the lever (3) is assembled and is narrowed after the lever (3) is assembled, so that the rotation supporting portion (24) rotatably supports a central part of rotation of the lever (3) by holding the lever (3) substantially in thickness direction (TD), characterized in that the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction (AD) of the lever (3).

Full Text	A Lever-Type Connector And Connector Assembly The present invention relates to a lever-type connector and connector assembly. A lever-type connector is known from Japanese Unexamined Patent Publication No. 2003-36932. This connector is assembled in a state where a lever for connecting a male and a female connector housings is accommodated in a pocket-shaped lever accommodating chamber formed in a side surface of one connector housing. The lever accommodating chamber has a double wall structure comprised of an inner and an outer walls. The lever is rotatably assembled by being pushed into the lever accommodating chamber from an end surface side and fitting a supporting shaft projecting into the lever accommodating chamber into a mount hole penetrating the lever. In order to fit the supporting shaft into the mount hole of the lever, the supporting shaft has to be pushed up in a direction opposite to a projecting direction thereof to provide a clearance (corresponding to the thickness of the lever) necessary to assemble the lever. For this, a large operation force is necessary to assemble the lever because of a reaction force resulting from this deformation to widen the clearance. The clearance may be simply set to have a large width in order to reduce the operation force, but it leads to a likelihood that the lever easily comes out of the accommodating chamber. Accordingly, it has not been conventionally easy to reduce the operation force during the assembling while preventing the lever from coming out. The present invention was developed in view of the above situation, and an object thereof is to provide a lever-type connector and connector assembyl capable of reducing an operator's burden during the assembling while preventing a lever from coming out. This object is solved according to the invention by the features of the independent claims, preferred embodiments of the invention are subject of the dependent claims. According to the invention, there is provided a lever-type connector, comprising: a housing connectabie with a mating housing, a lever rotatably or pivotably provided in or on the housing and having a cam member formed in or on at least one side surface thereof, the cam member being engageable with a mating cam member provided in or on the mating housing to display a cam action to perform or assist a connection of the housing with the mating housing, wherein the housing is formed with at least one rotation supporting portion having a clearance that can be widened as the lever is assembled and is narrowed after the lever is assembled, so that the rotation supporting portion rotatably or pivotably supports a central part of rotation or pivotal movement of the lever by holding the lever substantially in thickness direction, and the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction of the lever. Accordingly, a peripheral edge portion of the lever is pushed into the clearance of the rotation supporting portion upon at least partly assembling the lever into the housing. At this time, the clearance is resiliently deformed to be widened, thereby permitting the assembling of the lever and is resiliency at least partly restored to be narrowed thereafter, so that the rotation supporting portion rotatably or pivotably supports the lever by holding the substantially central part of rotation or pivotal movement of the lever. With the lever completely assembled, the clearance of the rotation supporting portion is narrower at the exit side than at the entrance side with respect to the assembling direction. This is effective in preventing the detachment of the lever. Conversely, since the clearance is wider at the entrance side, resistance during the assembling of the lever can be suppressed low. According to a preferred embodiment of the invention, there is further provided a lever-type connector assembly, comprising: a first housing, a lever rotatably provided in a first housing and having a cam groove formed in a side surface thereof, a second hQusing connectable with the first housing, and a cam pin formed on the second housing and guidable along the cam groove as the lever is rotated, thereby connecting the first and second housings, wherein the first housing is formed with a rotation supporting portion having a clearance that can be widened as the lever is assembled and is narrowed after the lever is assembled, so that the rotation supporting portion rotatably supports a central part of rotation of the lever by holding the lever in thickness direction, and the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction of the lever. Accordingly, a peripheral edge portion of the lever is pushed into the clearance of the rotation supporting portion upon assembling the lever into the first housing. At this time, the clearance is resiliency deformed to be widened, thereby permitting the assembling of the lever and is resiliency restored to be narrowed thereafter, so that the rotation supporting portion rotatably supports the lever by holding the central part of rotation of the lever. With the lever completely assembled, the clearance of the rotation supporting portion is narrower at the exit side than at the entrance side with respect to the assembling direction. This is effective in preventing the detachment of the lever. Conversely, since the clearance is wider at the entrance side, resistance during the assembling of the lever can be suppressed low. Preferbly, the cam member is arranged before the central part of rotation with respect to the assembling direction. Further preferably, a specified (predetermined or predeterminable) lengthwise area of the cam member is formed to extend substantially along the assembling direction of the lever when the lever is assembled into the housing. Most preferably, the cam groove is arranged before the central part of rotation with respect to the assembling direction, and a specified lengthwise area is formed to extend along the assembling direction of the lever when the lever is assembled into the first housing. Upon being assembled, the lever is gradually moved from the peripheral edge portion toward the central part of rotation relative to the clearance. According to the above, an operator's burden during the lever assembling operation can be reduced since the bored or thinned part (specified lengthwise area of the cam groove) of the lever is arranged substantially on an assembling line of the lever to shorten the length of the thick part passing the clearance as much as possible. According to a further preferred embodiment of the invention, the lever is recessed substantially at the central part of rotation to form a mount hole. Preferably, the rotation supporting portion includes at least one pair of projections substantially opposed to each other in the thickness direction of the lever in the housing and at least partly fittable into the mount hole while defining the clearance therebetween. Further preferably, the rotation supporting portion, preferably the projections, is/are formed with one or more detachment preventing surfaces that come substantially into contact with the wall of the mount hole when a force is exerted from the mating cam member to the cam member to push back the lever in a direction opposite to the assembling direction as the lever is rotated. Still further preferably, the lever is recessed at the central part of rotation to form a mount hole, the rotation supporting portion includes a pair of projections opposed to each other in the thickness direction of the lever in the first housing and fittable into the mount hole while defining the clearance therebetween, and the projections are formed with detachment preventing surfaces that come into contact with the wall of the mount hole when a force is exerted from the cam pin to the cam groove to push back the lever in a direction opposite to the assembling direction as the lever is rotated. A force trying to displace the lever in a detaching direction may be exerted from the cam pin to the wall of the cam groove upon connecting or 5 separating the first and second housings by rotating the lever. According to the above, the detachment preventing surfaces formed on the projections come into contact with the wall of the mount hole of the lever. This can avoid such a movement of the lever as to come out of the first housing during the rotating operation, thereby ensuring a smooth lever operation. Further preferably, the cam member comprises a cam groove, wherein the entrance of the cam groove preferably is located on the axis of symmetry passing the mount hole of the lever with the lever located at the standby position. Still further preferably, one or more resilient locking pieces are provided for holding the lever at the standby position, wherein the resilient locking pieces are arranged preferably at a position of the lever adjacent to the entrance of the cam groove. Most preferably, one or more disengagement ribs project at the (preferably substantially opposite) widthwise side(s) of the mating cam member, wherein the disengagement rib(s) function(s) to free the lever partly locked in its standby state, and preferably extend substantially in a connecting direction of the connector housing with the mating connector housing. According to the invention, there is further provided a lever-type connector assembly comprising a lever-type connector according to the invention or a preferred embodiment thereof and a mating connector housing connectable therewith. According to a further aspect of the invention, there is provided a method of assembling lever-type connector assembly, in particular according to the invention or a preferred embodiment thereof, comprising the following steps: providing a first housing, assembling a lever rotatably in or on the first housing, the lever having a cam groove formed in a side surface thereof, providing a second housing connectable with the first housing having a cam pin formed thereon, rotating or pivoting the lever, thereby guiding the cam pin along the cam groove and connecting the first and second housings or assisting their connection, wherein in the assembling step a clearance of a rotation supporting portion of the first housing is widened and is narrowed after the lever is assembled, so that the rotation supporting portion rotatably supports a central part of rotation of the lever by holding the lever in thickness direction, wherein the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction of the lever. These and other objects, features and advantages of the present invention will become more apparent upon reading of the following detailed description of preferred embodiments and accompanying drawings. It should be understood that even though embodiments are separately described, single features thereof may be combined to additional embodiments. FIG. 1 is a plan view showing a state where a lever is at a standby position, FIG. 2 is a plan view showing a state where the lever is at a connecting position, FIG. 3 is a front view of a female connector housing, FIG. 4 is a rear view of the female connector housing, FIG. 5 is a side view in section showing an assembling construction of the lever, FIG. 6 is a plan view of a male connector housing, FIQ. 7 is a front view of the male connector housing, FIG. 8 is a side view in section of the male connector housing, FIG. 9 is a plan view of the lever, and FIG. 10 is a side view of the lever. One preferred embodiment of the present invention is described with reference to FIGS. 1 to 10. A lever-type connector according to this embodiment is such that a female connector housing 1 (corresponding to % preferred first housing) and a male connector housing 2 (corresponding to a preferred second housing) are connected and separated (or their connection and separation is assisted) along a connecting direction GD by means of a lever 3 (as a preferred operable member) provided in the female connector housing 1. First, the male connector housing 2 is described with reference to FIGS. 6 to 8. The male connector housing 2 is integrally or unitarily made e.g. of a synthetic resin material and, a receptacle 6 preferably substantially in the form of a rectangular tube having an open front side is formed before a terminal accommodating portion 5 for at least partly accommodating one or more male terminal fittings 4. One or more, preferably a multitude of cavities 7 are formed to penetrate the terminal accommodating portion 5 substantially in forward and backward directions, and the one or more respective male terminal fittings 4 can be at least partly accommodated thereinto from an insertion side, preferably substantially from behind. Preferably, a plurality of kinds of cavities 7 are set because a plurality of kinds of male terminal fittings 4 are mounted thereinto in this embodiment. In each cavity 7, a locking portion 8 is resiliency deformably provided to be engaged with the corresponding male terminal fitting 4 to retain it. The male terminal fitting 4 preferably is connected, preferably crimped into connection, with a waterproof rubber plug 9 (as a preferred fluidproof resilient plug) mounted on a wire, and sealing is provided between the wire and the wall surface of the cavity 7 by the close contact of the waterproof rubber plug 9 with the inner wall surface of each cavity 7. As shown in FIG. 8, a retainer 10 preferably is mounted into (preferably a front end side of) the terminal accommodating portion 5 (preferably from front) to at least partly enter deformation spaces for the locking portions 8, thereby preventing the locking portions 8 from being resiliency deformed in a disengaging direction from the male terminal fittings 4. It should be understood that the retainer may be also of the side-insertion type e.g. in case of a nonwaterproof connector or may be omitted completely e.g. if no fluid-tightness is necessary. A cam pin 11 projects at a widthwise intermediate position (preferably substantially at a widthwise center position) of the lateral (upper) surface of the receptacle 6 preferably near or at the front end. The cam pin 11 preferably is substantially cylindrical, and a flange edge 11A bulges out along at least part of the circumference, preferably the substantially entire circumference at or near the leading end thereof. The flange edge 11A is engaged with the substantially opposite edges of a cam groove 12 while the cam pin 11 is displaced in the cam groove 12 to be described later. Further, one or more, preferably a pair of disengagement ribs 13 project at the (preferably substantially opposite) widthwise side(s) of the cam pin 11. The (preferably both) disengagement rib(s) 13 function to free the lever 3 partly locked in its standby state, and extend substantially in a connecting direction CD of the two connector housings 1, 2. The female connector housing 1 is integrally or unitarily made e.g. of a synthetic resin material and includes an inner tubular portion 15 formed with one or more, preferably a multitude of cavities 14 penetrating the inner tubular portion 15 substantially in forward and backward directions. There are as many kinds of the cavities 14 of the inner tubular portion 15 as the cavities 7 of the male connector housing 2, wherein each cavity 14 has a locking portion 16 resiliency deforrnable at least partly into the cavity 14 to be engaged with a female terminal fitting 17. Each female terminal fitting 17 is comprised of a (preferably substantially rectangular) tube portion 17A for the connection with the male terminal fitting 4 and a wire connecting portion (preferably comprising a barrel portion 17B) continuously provided behind the (rectangular) tube portion 17A to connected (preferably be crimped or bent or folded into connection) with a wire. A waterproof rubber plug 18 (as a preferred fluid-proof resilient plug) is to be mounted on an insulation coating of the wire behind or adjacent to the barrel portion 17B, and sealing is provided between the wire and the inner surface of the cavity 14 by the substantially close contact of the outer circumferential surface of the waterproof rubber plug 18 with the inner circumferential surface of the cavity 14. A (preferably substantially cap-shaped) retainer 19 is mountable on or to a front end portion of the inner tubular portion 15 preferably substantially from front, and the resilient deformations of the locking portions 16 can be prevented by the at least partial entrance of leading end portions of this retainer 19 into deformation spaces for the locking portions The receptacle 6 of the male connector housing 2 is at least partly insertable into a clearance between the above described inner tubular portion 15 and an outer tubular portion 20. A (preferably substantially tubular) seal ring 22 made of rubber or resilient material is mounted on or to the outer circumferential surface of the inner tubular portion 15 preferably at an intermediate position (preferably near a substantially middle part) of the inner tubular portion 15 with respect to forward and backward directions. In a shown example, one or more, preferably three lips are formed on the outer circumferential surface of the seal ring 22 to be brought substantially into close contact with the inner circumferential surface of the receptacle 6, thereby providing sealing between the female and male connector housings 1, 2. A lever accommodating space 21 for at least partly accommodating the lever 3 is formed at a lateral (preferably upper) side of the outer tubular portion 20. This lever accommodating space 21 penetrates substantially in forward and backward directions, and a (preferably substantially rectangular) cutout 23 is formed at or near a front side of the inner (preferably lower) surface of the lever accommodating space 21 of the outer tubular portion 20 to substantially communicate the lever accommodating space 21 with an inner space of the outer tubular portion 20. At the time of connecting the female and male connector housings 1, 2, both the cam pin 11 and the two disengagement ribs 13 are displaceable at least partly in this cutout 23. Further, a rotation supporting portion 24 for rotatably or pivotably supporting the lever 3 is provided in or at the lever accommodating space 21. The rotation supporting portion 24 is described in detail later. First, the lever 3 is described. The lever 3 is made e.g. of a synthetic resin material and preferably includes a main plate 25 having an arcuate peripheral edge, for example, as shown in FIGS. 9 and 10. An operable portion 26 slightly bulging out backward and/or radially outward is provided at or near one corner portion at or near the rear edge of the main plate 25. In this embodiment, the lever 3 preferably substantially is vertically symmetrically shaped so as to be mountable into the lever accommodating space 21 even if being turned upside down. Thus, a rotating direction of the lever 3 can be selected depending on an installed state and the like of the connector. Regardless of its mounting posture, the lever 3 is rotatably mountable between a standby position SP and a connecting position CP in the lever accommodating space 21. Here, the standby position SP is a position of the lever 3 where the cam pin 11 can be received substantially straight into the cam groove 12 of the lever 3 as the female and male connector housings 1, 2 are initially connected as shown in FIG. 1, and the connecting position CP is a position of the lever 3 where the two connector housings" 1, 2 are substantially completely connected as shown in FIG. 2. A (preferably substantially round) mount hole 27 is formed to recess or penetrate the main plate 25 preferably substantially in the center. The cam groove 12 is formed before (closer to the arcuate peripheral edge) the mount hole 27 in the main plate 25. The cam groove 12 has an open end at the arcuate peripheral edge of the main plate 25. An introducing path 12A extends preferably substantially straight from this open end toward the mount hole 27 and then a cam action path 12B follows substantially in parallel with a straight section of the peripheral edge of the main plate 25 while being at an angle different from 0° or 180° to the introducing path 12A. The back end of the cam action path 12B is located at a position slightly beyond the mount hole 27. One or more resilient locking pieces 28 for holding or positioning the lever 3 at the standby position SP are arranged preferably at a position of the main plate 25 adjacent to the entrance of the cam groove 12. The resilient locking pieces 28 preferably are in the form of cantilevers projecting in substantially opposite directions along the thickness direction TD of the main plate 25, wherein one end of each resilient locking piece 28 is coupled and the other end thereof is a free end, and are resiliency deformable substantially along vertical direction (thickness direction TD). The free end of one resilient locking piece 28 is engaged or engageable with a part of the inner wall surface of the lever accommodating space 21 to prevent the lever 3 from rotating or pivoting or moving toward the connecting position CP when the lever 3 i§ at the standby position SP. Further, the resilient locking piece 28 preferably is located on the entrance path of the corresponding disengagement rib 13 of the male connector housing 2 when the lever 3 is at the standby position SP, and is automatically disengaged from the inner wall surface of the lever accommodating space 21 by the disengagement rib 13 when the female and male connector housings 1, 2 are lightly fitted to each other. A lock piece 29 is arranged at a position of the main plate 25 adjacent to the operable portion 26. This lock piece 29 preferably is in the form of a cantilever extending substantially toward the operable portion 26, and is resiliency deformable along vertical direction (thickness direction TD of the 13 main plate 25). One or more lock projections 30 project upward and downward in an intermediate part (preferably substantially in the longitudinal middle part) of the lock piece 29. When the lever 3 is at the connecting position CP, one lock projection 30 is engaged with one of a pair of return preventing portions 31 formed at substantially symmetrical positions in the lever accommodating space 21, whereby the lever 3 can be held or positioned at the connecting position CP. One or both upper and lower surfaces of the main plate 25 are recessed inwardly with respect to the thickness direction TD of the main plate 25 in areas where a front end portion of the lock piece 29 are formed, thereby forming one or more holding step portions 32. When the lever 3 is at the standby position SP, one holding step portion 32 is engaged with the corresponding return preventing portion 31 so that the lever 3 can be held or positioned at the standby position SP. Further, one or both upper and lower surfaces of the main plate 25 are recessed from an intermediate position of the cam action path 12B of the cam groove 12 toward the mount hole 27, i.e. on an axial line substantially connecting the introducing path 12A of the cam groove 12 and the mount hole 27, thereby forming escaping grooves 33. These one or more escaping grooves 33 are provided for letting supporting shafts 34 to be described later at least partly escape before reaching the mount hole 27 upon mounting the lever 3 into the lever accommodating space 21. Further, a slant 35 having an upward or downward inclination preferably is formed at an end of each escaping groove 33 toward the mount hole 27, so that the supporting shaft 34 can smoothly move onto the main plate 25. Furthermore, one or more escaping grooves 36 14' for letting the return preventing portions 31 at least partly escape upon at least partly mounting the lever 3 into the lever accommodating space 21 are formed at positions of the upper and/or lower surfaces of the main plate 25 slightly before the holding step portions 32. These escaping grooves 36 are formed substantially in an assembling direction AD of the lever 3 by recessing, and one or more slants 37 for smoothing movements of the return preventing portions 31 onto the main plate 25 are formed at or near ends of the escaping grooves 36 near the holding step portions 32. On the other hand, one or more recesses 38 are formed at a side of the rear edge of the lever 3 substantially opposite to the operable portion 26. These recesses 38 function to let the corresponding return preventing portions 31 at least partly escape when the lever 3 is mounted into the lever accommodating space 21. Further, one recess 38 is engaged with the corresponding return preventing portion 31 when the lever 3 is at the connecting position CP, whereby the lever 3 can be held or positioned at the connecting position, The rotation supporting portion 24 arranged in or at the leve/ accommodating space 21 preferably is at a relatively back position on the widthwise center line of the female connector housing 1. The lever accommodating space 21 preferably is substantially transversely symmetrically formed with respect to this widthwise center line. The rotation supporting portion 24 is formed by one or more (substantially cylindrical) supporting shafts 34 coaxially projecting from the upper and/or lower surfaces of the lever accommodating space 21 preferably so as to be substantially opposed to each other. Both supporting shafts 34 are at least partly fitted into the mount hole 27 to make the entire lever 3 rotatable or pivotable about the supporting shafts 34. Upon being mounted into the lever accommodating space 21, the lever 3 is inserted from a lever insertion side, preferably substantially from behind, such that the plate surfaces thereof substantially are vertically opposed to each other while forcibly deforming the lever accommodating space 21 to widen the clearance between the supporting shafts 34. When the supporting shafts 34 come to be substantially aligned with the mount hole 27, the supporting shafts 34 at least partly return and the lever 3 is at least partly accommodated into the lever accommodating space 21. As shown in FIG. 5, one or more slants 39 preferably having the substantially same inclination are formed at end surfaces of both supporting shafts 34 so that the clearance between the tips of the supporting shafts 34 becomes gradually narrower from the entrance side toward the exit side along the assembling direction AD (direction of an arrow in FIG. 5). The clearance between the supporting shafts 34 at the entrance side preferably is set such that an operation force exerted to the lever 3 is about the same as before, and the clearance therebetween at the exit side is set maximally narrow while ensuring the sufficient strength of a mold pin of a mold in view of the operation force during the assembling. With the (preferably both) upper and/or lower supporting shafts 34 at least partly fitted in the mount hole 27, the outer circumferential surfaces of the supporting shafts 34 are substantially in close contact with the hole wall of the mount hole 27. Particularly, parts of the supporting shafts 34 that are substantially in contact with the wall of the mount hole 27 and resist the detachment of the lever 3 function as detachment preventing surfaces 40. Next, functions and effects of this embodiment constructed as above are specifically described. When the receptacle 6 of the male connector housing 2 16 is initially lightly fitted into the female connector housing 1 with the lever 3 held or positioned at the standby position SP, the cam pin 11 at least partly enters the entrance of the introducing path 12A of the cam groove 12. At this time, one disengagement rib 13 comes substantially into contact with the corresponding resilient locking piece 28, which is resiliency deformed by moving onto the disengagement rib 13 to disengage the resilient locking piece 28 and the inner wall surface of the lever accommodating space 21. Thus, the lever 3 can rotate or pivot in a rotation direction RD (in counterclockwise direction in FIG. 1). If the operable portion 26 is pushed to rotate or pivot the lever 3 about the supporting shafts 34 in this state, the lever 3 reaches the connecting position CP shown in FIG. 2. In the meantime, the cam pin 11 is guided by the cam groove 12, whereby the connecting operation of the two connector housings 1, 2 progresses or is assisted. When the lever 3 substantially reaches the connecting position CP, the two connector housings 1, 2 are substantially completely connected and one lock projection 30 of the lock piece 29 is engaged with the corresponding return preventing portion 31 to lock the lever 3. Converse to the above, in the case of separating the two connector housings 1, 2, the operable portion 26 is gripped to rotate or pivot the lever 3 in a direction substantially opposite to the rotation direction RD (clockwise) while the lock piece 29 is pushed down to be disengaged from the return preventing portion 31. In this way, the cam pin 11 is guided by the cam groove 12 to separate (or assist the separation of) the two connector housings 1, 2. Upon assembling the lever 3 into the female connector housing 1, the lever 3 is located at an insertion side of, preferably substantially behind, the lever accommodating space 21. More specifically, the lever 3 is at least partly inserted into the lever accommodating space 21 while being oriented such that the entrance of the cam groove 12 is located substantially in the widthwise center of the female connector housing 1 and the introducing path 12A of the cam groove 12 extend substantially along the connecting direction CD of the two connector housings 1, 2. Then, both supporting shafts 34 relatively move along the introducing path 12A of the cam groove 12 to come substantially into contact with the starting point of the ascent of the escaping groove 33. If the lever 3 is strongly pushed in this state, a part of the lever 3 between the bottom surfaces of the escaping grooves 33 in the upper and/or lower surfaces of the lever 3 thrusts itself between the two supporting shafts 34 while resiliency and vertically widening the clearance between the supporting shafts 34. When the facing surfaces of the supporting shafts 34 pass the bottom surfaces of the escaping grooves 33 and come to be substantially aligned with the mount hole 27, the supporting shafts 34 resiliency at least partly return. As a result, the supporting shafts 34 are at least partly fitted into the mount hole 27 to rotatably or pivotably mount the entire lever 3. As described above, the clearance between the supporting shafts 34 preferably is formed to become narrower from the entrance side toward the exit side with respect to the assembling direction AD of the lever 3. Specifically, the entrance side of the clearance is set wide to such a degree as not to burden an operator's pushing operation, whereas the exit side thereof is set narrow to such a degree as to ensure the minimum strength of the mold pin. Thus, a function of preventing the detachment of the lever 3 can be improved without increasing the burden on the assembling operation of the lever 3. Further, in this embodiment, the operator's burden is also mitigated by maximally shortening a moving distance of the supporting shafts 34 to the mount hole 27 by locating the introducing path 12A of the cam groove 12 along an assembling path of the lever 3. On the other hand, when the lever 3 is rotated or pivoted in a direction to separate the two connector housings 1, 2 as described above, the cam pin 11 is pulled toward the inner one of the inner and outer edges of the cam groove 12 that is closer to the supporting shafts 34, thereby exerting a pushing force on this groove edge. This pushing force acts to detach the lever 3 from the supporting shafts 34. However, in this embodiment, the detachment of the lever 3 that might occur during the separating operation can be securely avoided since the detachment preventing surfaces 40 of the supporting shafts 34 and the cam pin 11 are in surface contact in a direction at an angle different from 0° or 180°, preferably substantially normal to a detaching direction of the lever 3. Although the lever 3 is so assembled into the female connector housing 1 as to rotate or pivot counterclockwise from the standby position SP toward the connecting position CP in the above description, the lever 3 may be assembled in a transversely reversed posture in this embodiment. To this end, the lever 3 preferably substantially is vertically symmetrically shaped, the entrance of the cam groove 12 is located on the axis of symmetry passing the mount hole 27 of the lever 3 with the lever 3 located at the standby position SP, and/or the constructions of the housings such as the return preventing portions 31 and the disengagement ribs 13 are also substantially symmetrically arranged. By enabling the lever 3 to be assembled in a transversely reversed posture, an operating direction of the lever 3 can be selected in consideration of operational convenience according to an installation environment of the connector. Accordingly, to facilitate the assembling of a lever while improving a function of preventing the detachment of the lever, a female connector housing 1 is formed with a lever accommodating space 21, One or more, preferably a pair of supporting shafts 34 substantially coaxially project from the upper and/or lower inner surfaces of the lever accommodating space 21 to substantially face each other while defining a clearance therebetween, and a lever 3 is formed with at least one mount hole 27. Upon assembling the lever 3, the supporting shaft(s) 34 is/are at least partly fitted into the mount hole 27 while forcibly widening the clearance between the supporting shafts 34, whereby the lever 3 is rotatably or pivotably held. Since the clearance between the supporting shafts 34 preferably is formed to be wider at an entrance side and narrower at an exit side with respect to an assembling direction, the detachment of the lever can be strongly resisted while resistance during an assembling operation is maximally suppressed. Other EmbodimentsThe present invention is not limited to the above described and illustrated embodiment. For example, the following embodiments are also embraced by the technical scope of the present invention as defined by the claims. Beside the following embodiments, various changes can be made without departing from the scope and spirit of the present invention as defined by the claims. (1) Although the lever 3 is formed with the mount hole 27 and the supporting shafts 34 project in the lever accommodating space 21 to rotatably or pivotably support the lever 3 in the foregoing embodiment, a projectionrecess relationship may be reversed, i.e. the supporting shafts 34 may project 20 from the lever 3 and recesses for receiving the supporting shafts 34 may be formed in the wall surfaces of the lever accommodating space 21. In such a case, a clearance between the wall surfaces where the recesses are formed is made wider at an entrance side. (2) The lever 3 is not limited to the form of a single plate, and may be U-shaped as a whole by coupling a pair of plate members each formed with the cam groove 12 by an operable portion. (3) Although a pair of supporting shafts are formed on the upper and lower inner surfaces of the lever accommodating space in the foregoing embodiment, one supporting shaft may be formed on either one of the upper and lower surfaces. LIST OF REFERENCE NUMERALS 1 ... female connector housing (housing) 2 ... male connector housing (mating housing) 3 ... lever (movable member) 11 ... cam pin (mating cam member) 12 ... cam groove (cam member) 13 ... disengagement rib(s) 21 ... lever accommodating space 24 ... rotation supporting portion 27 ... mount hole 34 ... supporting shaft 37 ... slant 40 ... detachment preventing surface 22 WE CLAIM: 1. A lever-type connector, comprising: a housing (1) connectable with a mating housing (2), a lever (3) rotatably provided in or on the housing (1) and having a cam member (12) formed in at least one side surface thereof, the cam member (12) being engageable with a mating cam member (11) provided in or on the mating housing (3) to display a cam action to perform or assist a connection of the housing (1) with the mating housing (2), wherein the housing (1) is formed with at least one rotation supporting portion (24) having a clearance that can be widened as the lever (3) is assembled and is narrowed after the lever (3) is assembled, so that the rotation supporting portion (24) rotatably supports a central part of rotation of the lever (3) by holding the lever (3) substantially in thickness direction (TD), characterized in that the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction (AD) of the lever (3). 2. A lever-type connector as claimed in claim 1, wherein the cam member (12) is arranged before the central part of rotation with respect to the assembling direction (AD). 3. A lever-type connector as claimed in one or more of the preceding claims, wherein a specified lengthwise area (12A) of the cam member (12) is formed to extend substantially along theassembling direction (AD) of the lever (3) when the lever (3) is assembled into the housing (1). 4. A lever type connector as claimed in one or more of the preceding claims, wherein the lever (3) is recessed substantially at the central part of rotation to form a mount hole (27). 5. A lover-type connector as claimed in claim 4, wherein the rotation supporting portion (24) includes at least one pair of projections substantially opposed to each other in the thickness direction (TD) of the lever (3) in the housing (1) and at least partly fittable into the mount hole (27) while defining the clearance there between. 6. A lever-type connector as claimed in claim 4 or 5, wherein the rotation supporting portion (24), preferably the projections, is/are formed with one or more detachment preventing surfaces (40) that come substantially into contact with the wall of the mount hole (27), when a force is exerted from the mating cam member (11) to the cam member (12) to push back the lever (3) in a direction opposite to the assembling direction (AD) as the lever (3) is rotated. 7. A lever-type connector as claimed in one or more of the preceding claims, wherein the cam member (12) comprises a cam groove (12), wherein the entrance of the cam groove (12) preferably is located on the axis of symmetry passing the mount hole (27) of the lever (3) with the lever (3) located at the standby position (SP). 8. A lever-type connector as claimed in one or more of the preceding claims, wherein one or more resilient locking pieces (28) are provided for holding the lever (3) at the standby position (SP), wherein the resilient'locking pieces (28) are arranged preferably at a position of the lever (3) adjacent to the entrance of the cam groove (12). 9. A lever-type connector as claimed in one or more of the preceding claims, wherein one or more disengagement ribs (13) project at the widthwise side(S) of the mating cam member (11), wherein the disengagement rib(s) (13) function(s) to free the lever (3) partly locked in its standby state, and preferably extend substantially in a connecting direction (CD) of the connector housing (1) with the mating connector housing (2).

Full Text

A Lever-Type Connector And Connector Assembly
The present invention relates to a lever-type connector and connector
assembly.
A lever-type connector is known from Japanese Unexamined Patent
Publication No. 2003-36932. This connector is assembled in a state where a
lever for connecting a male and a female connector housings is accommodated
in a pocket-shaped lever accommodating chamber formed in a side surface of
one connector housing. The lever accommodating chamber has a double wall
structure comprised of an inner and an outer walls. The lever is rotatably
assembled by being pushed into the lever accommodating chamber from an
end surface side and fitting a supporting shaft projecting into the lever
accommodating chamber into a mount hole penetrating the lever.
In order to fit the supporting shaft into the mount hole of the lever, the
supporting shaft has to be pushed up in a direction opposite to a projecting
direction thereof to provide a clearance (corresponding to the thickness of the
lever) necessary to assemble the lever. For this, a large operation force is
necessary to assemble the lever because of a reaction force resulting from this
deformation to widen the clearance. The clearance may be simply set to have a
large width in order to reduce the operation force, but it leads to a likelihood
that the lever easily comes out of the accommodating chamber. Accordingly, it
has not been conventionally easy to reduce the operation force during the
assembling while preventing the lever from coming out.
The present invention was developed in view of the above situation, and
an object thereof is to provide a lever-type connector and connector assembyl
capable of reducing an operator's burden during the assembling while
preventing a lever from coming out.
This object is solved according to the invention by the features of the
independent claims, preferred embodiments of the invention are subject of the
dependent claims.
According to the invention, there is provided a lever-type
connector, comprising:
a housing connectabie with a mating housing,
a lever rotatably or pivotably provided in or on the housing and having a
cam member formed in or on at least one side surface thereof, the cam
member being engageable with a mating cam member provided in or on the
mating housing to display a cam action to perform or assist a connection of the
housing with the mating housing,
wherein the housing is formed with at least one rotation supporting
portion having a clearance that can be widened as the lever is assembled and
is narrowed after the lever is assembled, so that the rotation supporting portion
rotatably or pivotably supports a central part of rotation or pivotal movement of
the lever by holding the lever substantially in thickness direction, and the
clearance is formed to be gradually narrowed from an entrance side toward an
exit side with respect to an assembling direction of the lever.
Accordingly, a peripheral edge portion of the lever is pushed into the
clearance of the rotation supporting portion upon at least partly assembling the
lever into the housing. At this time, the clearance is resiliently deformed to be
widened, thereby permitting the assembling of the lever and is resiliency at
least partly restored to be narrowed thereafter, so that the rotation supporting
portion rotatably or pivotably supports the lever by holding the substantially
central part of rotation or pivotal movement of the lever. With the lever
completely assembled, the clearance of the rotation supporting portion is
narrower at the exit side than at the entrance side with respect to the
assembling direction. This is effective in preventing the detachment of the lever.
Conversely, since the clearance is wider at the entrance side, resistance during
the assembling of the lever can be suppressed low.
According to a preferred embodiment of the invention, there is further
provided a lever-type connector assembly, comprising:
a first housing,
a lever rotatably provided in a first housing and having a cam groove
formed in a side surface thereof,
a second hQusing connectable with the first housing, and
a cam pin formed on the second housing and guidable along the cam
groove as the lever is rotated, thereby connecting the first and second
housings,
wherein the first housing is formed with a rotation supporting portion
having a clearance that can be widened as the lever is assembled and is
narrowed after the lever is assembled, so that the rotation supporting portion
rotatably supports a central part of rotation of the lever by holding the lever in
thickness direction, and the clearance is formed to be gradually narrowed from
an entrance side toward an exit side with respect to an assembling direction of
the lever.
Accordingly, a peripheral edge portion of the lever is pushed into the
clearance of the rotation supporting portion upon assembling the lever into the
first housing. At this time, the clearance is resiliency deformed to be widened,
thereby permitting the assembling of the lever and is resiliency restored to be
narrowed thereafter, so that the rotation supporting portion rotatably supports
the lever by holding the central part of rotation of the lever. With the lever
completely assembled, the clearance of the rotation supporting portion is
narrower at the exit side than at the entrance side with respect to the
assembling direction. This is effective in preventing the detachment of the lever.
Conversely, since the clearance is wider at the entrance side, resistance during
the assembling of the lever can be suppressed low.
Preferbly, the cam member is arranged before the central part of rotation
with respect to the assembling direction.
Further preferably, a specified (predetermined or predeterminable)
lengthwise area of the cam member is formed to extend substantially along the
assembling direction of the lever when the lever is assembled into the housing.
Most preferably, the cam groove is arranged before the central part of
rotation with respect to the assembling direction, and a specified lengthwise
area is formed to extend along the assembling direction of the lever when the
lever is assembled into the first housing.
Upon being assembled, the lever is gradually moved from the peripheral
edge portion toward the central part of rotation relative to the clearance.
According to the above, an operator's burden during the lever assembling
operation can be reduced since the bored or thinned part (specified lengthwise
area of the cam groove) of the lever is arranged substantially on an assembling
line of the lever to shorten the length of the thick part passing the clearance as
much as possible.
According to a further preferred embodiment of the invention, the lever is
recessed substantially at the central part of rotation to form a mount hole.
Preferably, the rotation supporting portion includes at least one pair of
projections substantially opposed to each other in the thickness direction of the
lever in the housing and at least partly fittable into the mount hole while defining
the clearance therebetween.
Further preferably, the rotation supporting portion, preferably the
projections, is/are formed with one or more detachment preventing surfaces
that come substantially into contact with the wall of the mount hole when a
force is exerted from the mating cam member to the cam member to push back
the lever in a direction opposite to the assembling direction as the lever is
rotated.
Still further preferably, the lever is recessed at the central part of rotation
to form a mount hole,
the rotation supporting portion includes a pair of projections opposed to
each other in the thickness direction of the lever in the first housing and fittable
into the mount hole while defining the clearance therebetween, and
the projections are formed with detachment preventing surfaces that
come into contact with the wall of the mount hole when a force is exerted from
the cam pin to the cam groove to push back the lever in a direction opposite to
the assembling direction as the lever is rotated.
A force trying to displace the lever in a detaching direction may be
exerted from the cam pin to the wall of the cam groove upon connecting or
5
separating the first and second housings by rotating the lever. According to the
above, the detachment preventing surfaces formed on the projections come
into contact with the wall of the mount hole of the lever. This can avoid such a
movement of the lever as to come out of the first housing during the rotating
operation, thereby ensuring a smooth lever operation.
Further preferably, the cam member comprises a cam groove, wherein
the entrance of the cam groove preferably is located on the axis of symmetry
passing the mount hole of the lever with the lever located at the standby
position.
Still further preferably, one or more resilient locking pieces are provided
for holding the lever at the standby position, wherein the resilient locking pieces
are arranged preferably at a position of the lever adjacent to the entrance of the
cam groove.
Most preferably, one or more disengagement ribs project at the
(preferably substantially opposite) widthwise side(s) of the mating cam member,
wherein the disengagement rib(s) function(s) to free the lever partly locked in its
standby state, and preferably extend substantially in a connecting direction of
the connector housing with the mating connector housing.
According to the invention, there is further provided a lever-type
connector assembly comprising a lever-type connector according to the
invention or a preferred embodiment thereof and a mating connector housing
connectable therewith.
According to a further aspect of the invention, there is provided a method
of assembling lever-type connector assembly, in particular according to the
invention or a preferred embodiment thereof, comprising the following steps:
providing a first housing,
assembling a lever rotatably in or on the first housing, the lever having a
cam groove formed in a side surface thereof,
providing a second housing connectable with the first housing having a
cam pin formed thereon,
rotating or pivoting the lever, thereby guiding the cam pin along the cam
groove and connecting the first and second housings or assisting their
connection,
wherein in the assembling step a clearance of a rotation supporting
portion of the first housing is widened and is narrowed after the lever is
assembled, so that the rotation supporting portion rotatably supports a central
part of rotation of the lever by holding the lever in thickness direction, wherein
the clearance is formed to be gradually narrowed from an entrance side toward
an exit side with respect to an assembling direction of the lever.
These and other objects, features and advantages of the present
invention will become more apparent upon reading of the following detailed
description of preferred embodiments and accompanying drawings. It should be
understood that even though embodiments are separately described, single
features thereof may be combined to additional embodiments.
FIG. 1 is a plan view showing a state where a lever is at a standby
position,
FIG. 2 is a plan view showing a state where the lever is at a connecting
position,
FIG. 3 is a front view of a female connector housing,
FIG. 4 is a rear view of the female connector housing,
FIG. 5 is a side view in section showing an assembling construction of
the lever,
FIG. 6 is a plan view of a male connector housing,
FIQ. 7 is a front view of the male connector housing,
FIG. 8 is a side view in section of the male connector housing,
FIG. 9 is a plan view of the lever, and
FIG. 10 is a side view of the lever.
One preferred embodiment of the present invention is described with
reference to FIGS. 1 to 10. A lever-type connector according to this
embodiment is such that a female connector housing 1 (corresponding to %
preferred first housing) and a male connector housing 2 (corresponding to a
preferred second housing) are connected and separated (or their connection
and separation is assisted) along a connecting direction GD by means of a
lever 3 (as a preferred operable member) provided in the female connector
housing 1.
First, the male connector housing 2 is described with reference to FIGS.
6 to 8. The male connector housing 2 is integrally or unitarily made e.g. of a
synthetic resin material and, a receptacle 6 preferably substantially in the form
of a rectangular tube having an open front side is formed before a terminal
accommodating portion 5 for at least partly accommodating one or more male
terminal fittings 4. One or more, preferably a multitude of cavities 7 are formed
to penetrate the terminal accommodating portion 5 substantially in forward and
backward directions, and the one or more respective male terminal fittings 4
can be at least partly accommodated thereinto from an insertion side,
preferably substantially from behind. Preferably, a plurality of kinds of cavities 7
are set because a plurality of kinds of male terminal fittings 4 are mounted
thereinto in this embodiment. In each cavity 7, a locking portion 8 is resiliency
deformably provided to be engaged with the corresponding male terminal fitting
4 to retain it. The male terminal fitting 4 preferably is connected, preferably
crimped into connection, with a waterproof rubber plug 9 (as a preferred
fluidproof resilient plug) mounted on a wire, and sealing is provided between
the wire and the wall surface of the cavity 7 by the close contact of the
waterproof rubber plug 9 with the inner wall surface of each cavity 7.
As shown in FIG. 8, a retainer 10 preferably is mounted into (preferably a
front end side of) the terminal accommodating portion 5 (preferably from front)
to at least partly enter deformation spaces for the locking portions 8, thereby
preventing the locking portions 8 from being resiliency deformed in a
disengaging direction from the male terminal fittings 4. It should be understood
that the retainer may be also of the side-insertion type e.g. in case of a nonwaterproof
connector or may be omitted completely e.g. if no fluid-tightness is
necessary.
A cam pin 11 projects at a widthwise intermediate position (preferably
substantially at a widthwise center position) of the lateral (upper) surface of the
receptacle 6 preferably near or at the front end. The cam pin 11 preferably is
substantially cylindrical, and a flange edge 11A bulges out along at least part of
the circumference, preferably the substantially entire circumference at or near
the leading end thereof. The flange edge 11A is engaged with the substantially
opposite edges of a cam groove 12 while the cam pin 11 is displaced in the
cam groove 12 to be described later. Further, one or more, preferably a pair of
disengagement ribs 13 project at the (preferably substantially opposite)
widthwise side(s) of the cam pin 11. The (preferably both) disengagement rib(s)
13 function to free the lever 3 partly locked in its standby state, and extend
substantially in a connecting direction CD of the two connector housings 1, 2.
The female connector housing 1 is integrally or unitarily made e.g. of a
synthetic resin material and includes an inner tubular portion 15 formed with
one or more, preferably a multitude of cavities 14 penetrating the inner tubular
portion 15 substantially in forward and backward directions. There are as many
kinds of the cavities 14 of the inner tubular portion 15 as the cavities 7 of the
male connector housing 2, wherein each cavity 14 has a locking portion 16
resiliency deforrnable at least partly into the cavity 14 to be engaged with a
female terminal fitting 17. Each female terminal fitting 17 is comprised of a
(preferably substantially rectangular) tube portion 17A for the connection with
the male terminal fitting 4 and a wire connecting portion (preferably comprising
a barrel portion 17B) continuously provided behind the (rectangular) tube
portion 17A to connected (preferably be crimped or bent or folded into
connection) with a wire. A waterproof rubber plug 18 (as a preferred fluid-proof
resilient plug) is to be mounted on an insulation coating of the wire behind or
adjacent to the barrel portion 17B, and sealing is provided between the wire
and the inner surface of the cavity 14 by the substantially close contact of the
outer circumferential surface of the waterproof rubber plug 18 with the inner
circumferential surface of the cavity 14. A (preferably substantially cap-shaped)
retainer 19 is mountable on or to a front end portion of the inner tubular portion
15 preferably substantially from front, and the resilient deformations of the
locking portions 16 can be prevented by the at least partial entrance of leading
end portions of this retainer 19 into deformation spaces for the locking portions
The receptacle 6 of the male connector housing 2 is at least partly
insertable into a clearance between the above described inner tubular portion
15 and an outer tubular portion 20. A (preferably substantially tubular) seal ring
22 made of rubber or resilient material is mounted on or to the outer
circumferential surface of the inner tubular portion 15 preferably at an
intermediate position (preferably near a substantially middle part) of the inner
tubular portion 15 with respect to forward and backward directions. In a shown
example, one or more, preferably three lips are formed on the outer
circumferential surface of the seal ring 22 to be brought substantially into close
contact with the inner circumferential surface of the receptacle 6, thereby
providing sealing between the female and male connector housings 1, 2.
A lever accommodating space 21 for at least partly accommodating the
lever 3 is formed at a lateral (preferably upper) side of the outer tubular portion
20. This lever accommodating space 21 penetrates substantially in forward and
backward directions, and a (preferably substantially rectangular) cutout 23 is
formed at or near a front side of the inner (preferably lower) surface of the lever
accommodating space 21 of the outer tubular portion 20 to substantially
communicate the lever accommodating space 21 with an inner space of the
outer tubular portion 20. At the time of connecting the female and male
connector housings 1, 2, both the cam pin 11 and the two disengagement ribs
13 are displaceable at least partly in this cutout 23. Further, a rotation
supporting portion 24 for rotatably or pivotably supporting the lever 3 is provided
in or at the lever accommodating space 21. The rotation supporting portion 24
is described in detail later.
First, the lever 3 is described. The lever 3 is made e.g. of a synthetic
resin material and preferably includes a main plate 25 having an arcuate
peripheral edge, for example, as shown in FIGS. 9 and 10. An operable portion
26 slightly bulging out backward and/or radially outward is provided at or near
one corner portion at or near the rear edge of the main plate 25. In this
embodiment, the lever 3 preferably substantially is vertically symmetrically
shaped so as to be mountable into the lever accommodating space 21 even if
being turned upside down. Thus, a rotating direction of the lever 3 can be
selected depending on an installed state and the like of the connector.
Regardless of its mounting posture, the lever 3 is rotatably mountable between
a standby position SP and a connecting position CP in the lever
accommodating space 21. Here, the standby position SP is a position of the
lever 3 where the cam pin 11 can be received substantially straight into the cam
groove 12 of the lever 3 as the female and male connector housings 1, 2 are
initially connected as shown in FIG. 1, and the connecting position CP is a
position of the lever 3 where the two connector housings" 1, 2 are substantially
completely connected as shown in FIG. 2.
A (preferably substantially round) mount hole 27 is formed to recess or
penetrate the main plate 25 preferably substantially in the center. The cam
groove 12 is formed before (closer to the arcuate peripheral edge) the mount
hole 27 in the main plate 25. The cam groove 12 has an open end at the
arcuate peripheral edge of the main plate 25. An introducing path 12A extends
preferably substantially straight from this open end toward the mount hole 27
and then a cam action path 12B follows substantially in parallel with a straight
section of the peripheral edge of the main plate 25 while being at an angle
different from 0° or 180° to the introducing path 12A. The back end of the cam
action path 12B is located at a position slightly beyond the mount hole 27. One
or more resilient locking pieces 28 for holding or positioning the lever 3 at the
standby position SP are arranged preferably at a position of the main plate 25
adjacent to the entrance of the cam groove 12. The resilient locking pieces 28
preferably are in the form of cantilevers projecting in substantially opposite
directions along the thickness direction TD of the main plate 25, wherein one
end of each resilient locking piece 28 is coupled and the other end thereof is a
free end, and are resiliency deformable substantially along vertical direction
(thickness direction TD). The free end of one resilient locking piece 28 is
engaged or engageable with a part of the inner wall surface of the lever
accommodating space 21 to prevent the lever 3 from rotating or pivoting or
moving toward the connecting position CP when the lever 3 i§ at the standby
position SP. Further, the resilient locking piece 28 preferably is located on the
entrance path of the corresponding disengagement rib 13 of the male
connector housing 2 when the lever 3 is at the standby position SP, and is
automatically disengaged from the inner wall surface of the lever
accommodating space 21 by the disengagement rib 13 when the female and
male connector housings 1, 2 are lightly fitted to each other.
A lock piece 29 is arranged at a position of the main plate 25 adjacent to
the operable portion 26. This lock piece 29 preferably is in the form of a
cantilever extending substantially toward the operable portion 26, and is
resiliency deformable along vertical direction (thickness direction TD of the
13
main plate 25). One or more lock projections 30 project upward and downward
in an intermediate part (preferably substantially in the longitudinal middle part)
of the lock piece 29. When the lever 3 is at the connecting position CP, one
lock projection 30 is engaged with one of a pair of return preventing portions 31
formed at substantially symmetrical positions in the lever accommodating space
21, whereby the lever 3 can be held or positioned at the connecting position
CP.
One or both upper and lower surfaces of the main plate 25 are recessed
inwardly with respect to the thickness direction TD of the main plate 25 in areas
where a front end portion of the lock piece 29 are formed, thereby forming one
or more holding step portions 32. When the lever 3 is at the standby position
SP, one holding step portion 32 is engaged with the corresponding return
preventing portion 31 so that the lever 3 can be held or positioned at the
standby position SP.
Further, one or both upper and lower surfaces of the main plate 25 are
recessed from an intermediate position of the cam action path 12B of the cam
groove 12 toward the mount hole 27, i.e. on an axial line substantially
connecting the introducing path 12A of the cam groove 12 and the mount hole
27, thereby forming escaping grooves 33. These one or more escaping grooves
33 are provided for letting supporting shafts 34 to be described later at least
partly escape before reaching the mount hole 27 upon mounting the lever 3 into
the lever accommodating space 21. Further, a slant 35 having an upward or
downward inclination preferably is formed at an end of each escaping groove
33 toward the mount hole 27, so that the supporting shaft 34 can smoothly
move onto the main plate 25. Furthermore, one or more escaping grooves 36
14'
for letting the return preventing portions 31 at least partly escape upon at least
partly mounting the lever 3 into the lever accommodating space 21 are formed
at positions of the upper and/or lower surfaces of the main plate 25 slightly
before the holding step portions 32. These escaping grooves 36 are formed
substantially in an assembling direction AD of the lever 3 by recessing, and one
or more slants 37 for smoothing movements of the return preventing portions
31 onto the main plate 25 are formed at or near ends of the escaping grooves
36 near the holding step portions 32. On the other hand, one or more recesses
38 are formed at a side of the rear edge of the lever 3 substantially opposite to
the operable portion 26. These recesses 38 function to let the corresponding
return preventing portions 31 at least partly escape when the lever 3 is mounted
into the lever accommodating space 21. Further, one recess 38 is engaged with
the corresponding return preventing portion 31 when the lever 3 is at the
connecting position CP, whereby the lever 3 can be held or positioned at the
connecting position,
The rotation supporting portion 24 arranged in or at the leve/
accommodating space 21 preferably is at a relatively back position on the
widthwise center line of the female connector housing 1. The lever
accommodating space 21 preferably is substantially transversely symmetrically
formed with respect to this widthwise center line. The rotation supporting
portion 24 is formed by one or more (substantially cylindrical) supporting shafts
34 coaxially projecting from the upper and/or lower surfaces of the lever
accommodating space 21 preferably so as to be substantially opposed to each
other. Both supporting shafts 34 are at least partly fitted into the mount hole 27
to make the entire lever 3 rotatable or pivotable about the supporting shafts 34.
Upon being mounted into the lever accommodating space 21, the lever 3 is
inserted from a lever insertion side, preferably substantially from behind, such
that the plate surfaces thereof substantially are vertically opposed to each other
while forcibly deforming the lever accommodating space 21 to widen the
clearance between the supporting shafts 34. When the supporting shafts 34
come to be substantially aligned with the mount hole 27, the supporting shafts
34 at least partly return and the lever 3 is at least partly accommodated into the
lever accommodating space 21. As shown in FIG. 5, one or more slants 39
preferably having the substantially same inclination are formed at end surfaces
of both supporting shafts 34 so that the clearance between the tips of the
supporting shafts 34 becomes gradually narrower from the entrance side
toward the exit side along the assembling direction AD (direction of an arrow in
FIG. 5). The clearance between the supporting shafts 34 at the entrance side
preferably is set such that an operation force exerted to the lever 3 is about the
same as before, and the clearance therebetween at the exit side is set
maximally narrow while ensuring the sufficient strength of a mold pin of a mold
in view of the operation force during the assembling. With the (preferably both)
upper and/or lower supporting shafts 34 at least partly fitted in the mount hole
27, the outer circumferential surfaces of the supporting shafts 34 are
substantially in close contact with the hole wall of the mount hole 27.
Particularly, parts of the supporting shafts 34 that are substantially in contact
with the wall of the mount hole 27 and resist the detachment of the lever 3
function as detachment preventing surfaces 40.
Next, functions and effects of this embodiment constructed as above are
specifically described. When the receptacle 6 of the male connector housing 2
16
is initially lightly fitted into the female connector housing 1 with the lever 3 held
or positioned at the standby position SP, the cam pin 11 at least partly enters
the entrance of the introducing path 12A of the cam groove 12. At this time, one
disengagement rib 13 comes substantially into contact with the corresponding
resilient locking piece 28, which is resiliency deformed by moving onto the
disengagement rib 13 to disengage the resilient locking piece 28 and the inner
wall surface of the lever accommodating space 21. Thus, the lever 3 can rotate
or pivot in a rotation direction RD (in counterclockwise direction in FIG. 1). If the
operable portion 26 is pushed to rotate or pivot the lever 3 about the supporting
shafts 34 in this state, the lever 3 reaches the connecting position CP shown in
FIG. 2. In the meantime, the cam pin 11 is guided by the cam groove 12,
whereby the connecting operation of the two connector housings 1, 2
progresses or is assisted. When the lever 3 substantially reaches the
connecting position CP, the two connector housings 1, 2 are substantially
completely connected and one lock projection 30 of the lock piece 29 is
engaged with the corresponding return preventing portion 31 to lock the lever 3.
Converse to the above, in the case of separating the two connector
housings 1, 2, the operable portion 26 is gripped to rotate or pivot the lever 3 in
a direction substantially opposite to the rotation direction RD (clockwise) while
the lock piece 29 is pushed down to be disengaged from the return preventing
portion 31. In this way, the cam pin 11 is guided by the cam groove 12 to
separate (or assist the separation of) the two connector housings 1, 2.
Upon assembling the lever 3 into the female connector housing 1, the
lever 3 is located at an insertion side of, preferably substantially behind, the
lever accommodating space 21. More specifically, the lever 3 is at least partly
inserted into the lever accommodating space 21 while being oriented such that
the entrance of the cam groove 12 is located substantially in the widthwise
center of the female connector housing 1 and the introducing path 12A of the
cam groove 12 extend substantially along the connecting direction CD of the
two connector housings 1, 2. Then, both supporting shafts 34 relatively move
along the introducing path 12A of the cam groove 12 to come substantially into
contact with the starting point of the ascent of the escaping groove 33. If the
lever 3 is strongly pushed in this state, a part of the lever 3 between the bottom
surfaces of the escaping grooves 33 in the upper and/or lower surfaces of the
lever 3 thrusts itself between the two supporting shafts 34 while resiliency and
vertically widening the clearance between the supporting shafts 34. When the
facing surfaces of the supporting shafts 34 pass the bottom surfaces of the
escaping grooves 33 and come to be substantially aligned with the mount hole
27, the supporting shafts 34 resiliency at least partly return. As a result, the
supporting shafts 34 are at least partly fitted into the mount hole 27 to rotatably
or pivotably mount the entire lever 3.
As described above, the clearance between the supporting shafts 34
preferably is formed to become narrower from the entrance side toward the exit
side with respect to the assembling direction AD of the lever 3. Specifically, the
entrance side of the clearance is set wide to such a degree as not to burden an
operator's pushing operation, whereas the exit side thereof is set narrow to
such a degree as to ensure the minimum strength of the mold pin. Thus, a
function of preventing the detachment of the lever 3 can be improved without
increasing the burden on the assembling operation of the lever 3. Further, in
this embodiment, the operator's burden is also mitigated by maximally
shortening a moving distance of the supporting shafts 34 to the mount hole 27
by locating the introducing path 12A of the cam groove 12 along an assembling
path of the lever 3.
On the other hand, when the lever 3 is rotated or pivoted in a direction to
separate the two connector housings 1, 2 as described above, the cam pin 11
is pulled toward the inner one of the inner and outer edges of the cam groove
12 that is closer to the supporting shafts 34, thereby exerting a pushing force on
this groove edge. This pushing force acts to detach the lever 3 from the
supporting shafts 34. However, in this embodiment, the detachment of the lever
3 that might occur during the separating operation can be securely avoided
since the detachment preventing surfaces 40 of the supporting shafts 34 and
the cam pin 11 are in surface contact in a direction at an angle different from 0°
or 180°, preferably substantially normal to a detaching direction of the lever 3.
Although the lever 3 is so assembled into the female connector housing
1 as to rotate or pivot counterclockwise from the standby position SP toward the
connecting position CP in the above description, the lever 3 may be assembled
in a transversely reversed posture in this embodiment. To this end, the lever 3
preferably substantially is vertically symmetrically shaped, the entrance of the
cam groove 12 is located on the axis of symmetry passing the mount hole 27 of
the lever 3 with the lever 3 located at the standby position SP, and/or the
constructions of the housings such as the return preventing portions 31 and the
disengagement ribs 13 are also substantially symmetrically arranged. By
enabling the lever 3 to be assembled in a transversely reversed posture, an
operating direction of the lever 3 can be selected in consideration of operational
convenience according to an installation environment of the connector.
Accordingly, to facilitate the assembling of a lever while improving a
function of preventing the detachment of the lever, a female connector housing
1 is formed with a lever accommodating space 21, One or more, preferably a
pair of supporting shafts 34 substantially coaxially project from the upper and/or
lower inner surfaces of the lever accommodating space 21 to substantially face
each other while defining a clearance therebetween, and a lever 3 is formed
with at least one mount hole 27. Upon assembling the lever 3, the supporting
shaft(s) 34 is/are at least partly fitted into the mount hole 27 while forcibly
widening the clearance between the supporting shafts 34, whereby the lever 3
is rotatably or pivotably held. Since the clearance between the supporting
shafts 34 preferably is formed to be wider at an entrance side and narrower at
an exit side with respect to an assembling direction, the detachment of the lever
can be strongly resisted while resistance during an assembling operation is
maximally suppressed.
Other EmbodimentsThe present invention is not limited to the above described and
illustrated embodiment. For example, the following embodiments are also
embraced by the technical scope of the present invention as defined by the
claims. Beside the following embodiments, various changes can be made
without departing from the scope and spirit of the present invention as defined
by the claims.
(1) Although the lever 3 is formed with the mount hole 27 and the
supporting shafts 34 project in the lever accommodating space 21 to rotatably
or pivotably support the lever 3 in the foregoing embodiment, a projectionrecess
relationship may be reversed, i.e. the supporting shafts 34 may project
20
from the lever 3 and recesses for receiving the supporting shafts 34 may be
formed in the wall surfaces of the lever accommodating space 21. In such a
case, a clearance between the wall surfaces where the recesses are formed is
made wider at an entrance side.
(2) The lever 3 is not limited to the form of a single plate, and may be
U-shaped as a whole by coupling a pair of plate members each formed with the
cam groove 12 by an operable portion.
(3) Although a pair of supporting shafts are formed on the upper and
lower inner surfaces of the lever accommodating space in the foregoing
embodiment, one supporting shaft may be formed on either one of the upper
and lower surfaces.
LIST OF REFERENCE NUMERALS
1 ... female connector housing (housing)
2 ... male connector housing (mating housing)
3 ... lever (movable member)
11 ... cam pin (mating cam member)
12 ... cam groove (cam member)
13 ... disengagement rib(s)
21 ... lever accommodating space
24 ... rotation supporting portion
27 ... mount hole
34 ... supporting shaft
37 ... slant
40 ... detachment preventing surface
22

WE CLAIM:
1. A lever-type connector, comprising:
a housing (1) connectable with a mating housing (2),
a lever (3) rotatably provided in or on the housing (1) and having a cam member (12) formed in at least one side surface thereof, the cam member (12) being engageable with a mating cam member (11) provided in or on the mating housing (3) to display a cam action to perform or assist a connection of the housing (1) with the mating housing (2),
wherein the housing (1) is formed with at least one rotation supporting portion (24) having a clearance that can be widened as the lever (3) is assembled and is narrowed after the lever (3) is assembled, so that the rotation supporting portion (24) rotatably supports a central part of rotation of the lever (3) by holding the lever (3) substantially in thickness direction (TD), characterized in that
the clearance is formed to be gradually narrowed from an entrance side toward an exit side with respect to an assembling direction (AD) of the lever (3).
2. A lever-type connector as claimed in claim 1, wherein the cam member (12) is arranged before the central part of rotation with respect to the assembling direction (AD).
3. A lever-type connector as claimed in one or more of the preceding claims, wherein a specified lengthwise area (12A) of the cam member (12) is formed to extend substantially along theassembling direction (AD) of the lever (3) when the lever (3) is assembled into the housing (1).
4. A lever type connector as claimed in one or more of the preceding claims, wherein the lever (3) is recessed substantially at the central part of rotation to form a mount hole (27).
5. A lover-type connector as claimed in claim 4, wherein the rotation supporting portion (24) includes at least one pair of projections substantially opposed to each other in the thickness direction (TD) of the lever (3) in the housing (1) and at least partly fittable into the mount hole (27) while defining the clearance there between.
6. A lever-type connector as claimed in claim 4 or 5, wherein the rotation supporting portion (24), preferably the projections, is/are formed with one or more detachment preventing surfaces (40) that come substantially into contact with the wall of the mount hole (27), when a force is exerted from the mating cam member (11) to the cam member (12) to push back the lever (3) in a direction opposite to the assembling direction (AD) as the lever (3) is rotated.
7. A lever-type connector as claimed in one or more of the preceding claims, wherein the cam member (12) comprises a cam groove (12), wherein the entrance of the cam groove (12) preferably is located on the axis of symmetry passing the mount hole (27) of the lever (3) with the lever (3) located at the standby position (SP).
8. A lever-type connector as claimed in one or more of the preceding claims, wherein one or more resilient locking pieces (28) are provided for holding the lever (3) at the standby position (SP), wherein the resilient'locking pieces (28) are arranged preferably at a position of the lever (3) adjacent to the entrance of the cam groove (12).
9. A lever-type connector as claimed in one or more of the preceding claims, wherein one or more disengagement ribs (13) project at the widthwise side(S) of the mating cam member (11), wherein the disengagement rib(s) (13) function(s) to free the lever (3) partly locked in its standby state, and preferably extend substantially in a connecting direction (CD) of the connector housing (1) with the mating connector housing (2).

Documents:

344-DEL-2007-Abstract-(05-08-2011).pdf

344-del-2007-abstract.pdf

344-DEL-2007-Claims-(05-08-2011).pdf

344-del-2007-claims.pdf

344-DEL-2007-Correspondence Others-(05-08-2011).pdf

344-DEL-2007-Correspondence-Others-(20-10-2010).pdf

344-del-2007-correspondence-others-1.pdf

344-DEL-2007-Correspondence-Others.pdf

344-del-2007-description (complete).pdf

344-DEL-2007-Drawings-(05-08-2011).pdf

344-DEL-2007-Drawings.pdf

344-DEL-2007-Form-1-(05-08-2011).pdf

344-del-2007-form-1.pdf

344-del-2007-form-18.pdf

344-DEL-2007-Form-2-(05-08-2011).pdf

344-del-2007-form-2.pdf

344-DEL-2007-Form-3-(05-08-2011).pdf

344-DEL-2007-Form-3-(20-10-2010).pdf

344-DEL-2007-Form-3.pdf

344-DEL-2007-Form-5-(05-08-2011).pdf

344-del-2007-form-5.pdf

344-DEL-2007-GPA-(05-08-2011).pdf

344-del-2007-gpa.pdf

344-DEL-2007-Petition-137-(20-10-2010).pdf

344-DEL-2007-Petition-138-(20-10-2010).pdf

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Patent Number

253879

Indian Patent Application Number

344/DEL/2007

PG Journal Number

36/2012

Publication Date

07-Sep-2012

Grant Date

30-Aug-2012

Date of Filing

20-Feb-2007

Name of Patentee

SUMITOMO WIRING SYSTEMS, LTD.

Applicant Address

1-14, NISHISUEHIRO-CHO, YOKKAICHI-CITY, MIE 510-8503, JAPAN

Inventors:

#	Inventor's Name	Inventor's Address
1	YUKIHIRO FUKATSU AND HIROSHI SHIMAHATA	C/O SUMITOMO WIRING SYSTEMS, LTD.,1-14, NISHISUEHIRO-CHO, YOKKAICHI-CITY, MIE 510-8503, JAPAN

PCT International Classification Number

H01R13

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	JP2006-056798	2006-03-02	Japan