Title of Invention | A FITTING FOR A VEHICLE SEAT |
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Abstract | The invention relates to a fitting (10) for a vehicle seat, more particularly for a motor vehicle seat, comprising a first fitting part (11), a second fitting part (12) that is in geared connection with the first fitting part (11), a cam (27a, 27b: 127:327) that is rotatably mounted on the first fitting parts (11, 12) for driving a rolling movement of the first fitting part (11) the second fitting part (12), a driver (21) for driving the cam (27a, 27b; 127; 327) and a brake for locking the fitting (10) against torque introduced at the output side in the rest state, at least one wrap-spring brake (44) being provided as brake, said brake controlling the driver (21) and the cam (27a, 27b; 127; 327). |
Full Text | The invention relates to a fitting for a vehicle seat with the features of the precharacterizing clause of claim 1. In a fitting of this type known from DE 103 52 630 Al, a brake is placed on the outside and, in the inoperative position of the fitting, fixes the drive shaft in relation to the first fitting part. Torques which are introduced on the output side, for example due to the weight of the backrest, a specific loading of the same or due to vibrations, are therefore blocked. When the fitting is driven, the brake is released, and therefore the fitting parts can execute their rolling movement without hindrance. The invention is based on the object of improving a fitting of the type mentioned at the beginning. This object is achieved according to the invention by a fitting with the features of claim 1. Advantageous refinements are the subject matter of the subclaims. Owing to the fact that at least one wrap spring brake which is activated by the driver and/or the eccentric is provided as the brake, it is possible for the brake to be functionally integrated into the fitting, with components of the geared fitting being used in a dual function also to activate the brake. The activation can take place directly, i.e. by direct bearing of the driver and/or eccentric against wrap spring arms, which are preferably provided for activating the wrap spring brake, and subsequently acting upon said arms, or indirectly, i.e. with the use of intermediate components, such as disks or separate cams. The functional integration is preferably accompanied by structural integration, for example by arrangement of the wrap spring arms in the center of the fitting or the accommodation of a separately designed wrap spring bushing, which is provided as a counterpart for the braking action, by a fitting part or the integral formation of the wrap spring bushing with a fitting part, for example as a collar extension, step or wider bearing 2 bore of the fitting part. In this case, the inner side or the outer side can be the relevant surface for producing the braking action. A fitting of this type, which is provided on at least one side of the vehicle seat, is safe with regard to running-down as well as favorable with regard to efficiency. "Running-down" is to be understood as meaning that, by means of regular or irregular mechanical excitation (vibration or shaking), the two fitting parts bring about a rotation of the eccentric which leads, under the torque of the weight of the backrest, to a rolling movement of the fitting parts with the backrest pivoting backwards. A brake of the mentioned type does not need to be provided in the fitting on the other side of the vehicle seat, but a brake is preferably provided on both sides of the vehicle seat. The wrap spring brake supplies a high locking moment on the output side, but rotates with a freewheeling moment which is low in relation to the locking moment if a torque is introduced on the drive side. Since torques on the drive side are introduced via the driver, the driver is preferably designed in such a manner that it acts on the wrap spring brake in an opening manner and releases the latter during driving, for example by the driver having at least one driver cam which, upon bearing against a wrap spring arm and subsequently acting upon the latter, acts on the wrap spring brake in an opening manner. Alternatively, the driver can have a receptacle - if appropriate affected by play - for a wrap spring arm. Since the eccentric, on account of its mounting, firstly on the first fitting part and secondly on the second fitting part - is situated in the force flux and, in addition to the toothings between the fitting parts, receives the forces and torques introduced on the output side, including the fluctuations thereof, due to mechanical excitation, the eccentric is preferably designed in such a manner that it acts on the wrap spring brake in a closing manner such that 3 the latter can produce its locking moment and therefore its braking action, for example by the eccentric having a control cam which, upon bearing against a wrap spring arm with subsequent action upon the latter, acts on the wrap spring brake in a closing manner. Alternatively, the eccentric can have a receptacle - if appropriate affected by play - for a wrap spring arm. The mounting of the eccentric on a fitting part is to cover all variants of the relative mounting of eccentric and fitting part, i.e. the eccentric can be mounted, for example, in (radially within) a collar extension or step of the fitting part or on (radially outside) the same. The wrap spring brake produces its locking moment preferably by bearing against a wrap spring bushing which is rotationally fixed with respect to the second fitting part, preferably by means of a positive fit between suitable projections, for example radially protruding arms, of the wrap spring bushing and an inner toothing (present because of the production process) of the second fitting part. The wrap spring brake is preferably arranged within the wrap spring bushing, and therefore bears against the inner wall thereof and its wrap spring arms protrude radially inward. The eccentric is preferably mounted at least partially, for example an individual wedge segment of the same, with little friction both on the first fitting part and on the second fitting part, in particular by means of a sliding bearing and/or rolling bearing and/or surface processing and/or surface treatment. Since the friction between the sliding bearing (or rolling bearing) and the component sliding relative to the latter is lower than the direct friction between the wedge segments and the fitting parts, the losses during driving of the fitting, i.e. during the adjustment movement, are reduced, thus increasing the efficiency of the fitting. For the same output power, a lower driving power is therefore necessary. The freedom from play and the strength are maintained. 4 The lower friction of the sliding bearing in relation to conventional steel is based on special surface processing and/or surface treatment. Such surface processing (for example mechanical) or surface treatment (for example chemical) including application of a coating can also take place directly on the fitting parts. The lower friction of the rolling bearing in relation to the sliding friction of conventional steel is based on the rolling friction of the rolling bodies. The sliding bearings or rolling bearings etc. can also be provided in a mixed combination. The eccentric can have two wedge segments which are spread apart and, as a result, position the fitting in the inoperative state in a manner free from play. The wedge segments preferably move in the axially identical plane which is parallel to the planes of movement of the fitting parts. The wedge segments within the context of the invention may also each be formed on a disk, with the two (eccentric) disks then being arranged offset axially with respect to each other. The eccentric may also be in a single part - omitting the position in which it is free from play, for example may be designed as a sickle element or disk-shaped fixed eccentric, which simplifies production and installation. The driver may be in a single part or a number of parts. Since the backrest is loaded more to the rear than to the front, one wedge segment is subjected to a higher load, and therefore basically a higher degree of friction occurs thereon. The wedge segment which is subjected to a higher load is preferably therefore the wedge segment mounted on both sides by means of sliding bearings. However, the other wedge segment or - likewise preferably - both wedge segments may also be mounted on both sides by means of sliding bearings. It is possible for a wrap spring brake to be provided for each of the two 5 directions of rotation of the driver. As a result, the wedge segment which is subjected to the stronger load (running wedge) is immediately and directly locked in both directions during a running-down movement without first a deviation due to an idling path which is present until it bears against the associated wrap spring arm taking place. The wedge segment which is subjected to less load (locking wedge) then takes on the position which is free from play in the inoperative state of the fitting. The fitting according to the invention can be operated both manually and also by motor and can be used in vehicle seats, preferably for an angle- adjustable seat component, in particular seat part or backrest, for adjusting an angle within the seat component, for example the inclination of the seat cushion relative to a base, the inclination of a thigh support relative to the seat frame or the inclination of rockers, which serve to adjust the seat height, with respect to the seat frame or with respect to a base, or for adjusting an angle relative to another seat component, for example the inclination of the backrest relative to the seat part. The invention is explained in more detail below with reference to five exemplary embodiments with modifications, illustrated in the accompanying drawing, in which: Fig. 1 shows an exploded illustration of the first exemplary embodiment, Fig. 2 shows a partial view of the first exemplary embodiment with the driver only partially indicated, Fig. 3 shows a longitudinal section of a fitting according to the invention, 6 Fig. 4 shows a schematic illustration of a vehicle seat, Fig. 5 shows an exploded illustration of the second exemplary embodiment, Fig. 6 s hows a partial view of the second exemplary embodiment without a driver, Fig. 7 shows an exploded illustration of the third exemplary embodiment, Fig. 8 shows an exploded illustration of the fourth exemplary embodiment without the second fitting part, Fig. 9 shows a view of the fourth exemplary embodiment without a driver, Fig. 10 shows an exploded illustration of the fifth exemplary embodiment, Fig. 11 shows a view of the fifth exemplary embodiment with the driver only partially indicated, Fig. 12 shows a schematic diagram of the modification with two wrap spring brakes, and Fig. 13 shows a perspective partial view of the modification with two wrap spring brakes. A vehicle seat 1 for a motor vehicle has a seat part 3 and a backrest 4 which can be adjusted in its inclination relative to the seat part 3. A hand wheel 5, which can be actuated manually in order to adjust the inclination, on one side of the vehicle seat 1 rotates a drive shaft (not illustrated specifically) which is arranged horizontally in the transition region between seat part 3 and backrest 4 and, on both sides of the vehicle seat 1, engages in a rotationally fixed manner in a respective fitting 10. The backrest 4 is connected to the seat part 3 by means of the two fittings 10. The fitting 10 is designed as a geared fitting, in which a first fitting part 11 and a second fitting part 12 are connected to each other for adjustment and fixing via a gear designed as an eccentric epicyclic gear. The two fitting parts 11 and 12 have an essentially flat shape and are composed of steel. The first fitting part 11 is connected fixedly to the structure supporting the hand wheel 5 and the drive shaft (in the present case, the structure of the backrest 4), for which reason, in the exemplary embodiment, the first component 11 is illustrated in a manner fixed on the backrest and therefore at the top in the drawing. Accordingly, in the exemplary embodiment, the second fitting part 12 is fixed on the seat part, i.e. is connected to the structure of the seat part 3, and is illustrated at the bottom in the drawing. The positions of the fitting parts 11 and 12 may be interchanged, depending on requirements, i.e. the direction of the force flux through the fitting 10 may be the opposite way around to the previously mentioned arrangement of the fitting parts 11 and 12. The terms "mounting" and "supporting" used below are therefore not intended to be limiting with regard to the direction of the force flux. In order to form the gear, a toothed wheel 16 with an outer toothing is embossed on the second fitting part 12 and a toothed ring 7 with an inner toothing is embossed on the first fitting part 11, said toothings meshing with each other. The diameter of the outside circle of the outer toothing of the 8 toothed wheel 16 is smaller by at least one tooth height than the diameter of the root circle of the inner toothing of the toothed ring 17. The corresponding difference in the number of teeth of toothed wheel 16 and toothed ring 17 permits a rolling movement of the toothed ring 17 on the toothed wheel 16. On the side facing the toothed wheel 16, the first fitting part 11 has an integrally formed collar extension 19 concentrically with respect to the inner toothing of the toothed ring 17. To this extent, all of the exemplary embodiments agree. The first and the second exemplary embodiments are first of all described together below. A driver 21 is mounted with play by means of a hub 22 in the collar extension 19. The driver 21, which is composed of plastic and the arrangement of which defines the direction details used, is provided centrally with a bore 23 which matches the external splines of the drive shaft and runs axially. Furthermore, the driver 21 has an integrally formed driver segment 25 which is arranged in a curved manner about part of the collar extension 19. Two wedge segments 27a and 27b are supported, at least indirectly by means of their curved inner side, on the collar extension 19 and, by means of their curved outer sides, support a first sliding bearing 28 which is pressed into the second fitting part 12 in a rotationally fixed manner. The friction between the outer side of the metallic wedge segments 27a and 27b and the inner side of the bushing-shaped, first sliding bearing 28 is significantly lower than the direct friction between the wedge segments 27a and 27b in the fitting parts 11 or 12 would be. The driver segment 25 grasps with play between the narrow sides of the wedge segments 27a and 27b while the mutually facing wide sides of the wedge segments 27a and 27b each support an angled end finger of a spring coiled annularly, referred to below as omega spring 30. The omega spring 9 30 pushes the wedge segments 27a and 27b apart in the circumferential direction and therefore positions the fitting 10 in a manner free from play in the inoperative state. The driver 21 is secured axially on the outer side of the first fitting part 11 by means of a securing ring 31 which is clipped on. In order to absorb the axially acting forces, a respective holding plate (not illustrated in the drawing) is welded in a manner known per se onto the two fitting parts 11 and 12 and engages over the other fitting part in each case without obstructing the adjustment movement. The wedge segments 27a and 27b define an eccentric which is located in the force flux between the fitting parts 11 and 12 and is mounted thereon. The driver segment 25, which can also be classed as the eccentric, is located outside the force flux. The eccentric as an extension of the direction of eccentricity, presses the toothed wheel 16 and the toothed ring 17 into each other at an engagement point defined in this manner. During driving by means of the rotating drive shaft, a torque is first transmitted to the driver 21 and then to the eccentric which is defined in this manner and which slides along the first sliding bearing 28, shifting the direction of eccentricity and therefore shifting the engagement point of the toothed wheel 16 in the toothed ring 17, which is depicted as a wobbling rolling movement of the fitting parts 11 and 12 on each other. Owing to the weight of the backrest 4, which is customarily situated obliquely, and a pressure exerted on the backrest 4 by the occupant, a differentiation can be made in the case of the wedge segments 27a and 27b between a first wedge segment 27a, which is subjected to a higher load and is in front during an upward movement of the backrest 4, and a second wedge segment 27b which is subjected to a lower load. The efficiency of the fitting 10 depends noticeably on the friction between the first wedge segment 27a and the collar extension 19. According to the invention, in 10 order to reduce this friction, a second sliding bearing 41 is provided which sits in a more or less immovable manner (adhering) on the first wedge segment 27a and slides with little friction on the collar extension 19, i.e. corresponds functionally to the first sliding bearing 28. In the first exemplary embodiment, the second sliding bearing 41 is designed as a ring segment which extends over somewhat less than the inner side of the first wedge segment 27a, while, in the second exemplary embodiment, the second sliding bearing 41 is designed as a ring which is more or less completely closed and on which the wedge segment 27b which is subjected to a lower load also sits. Since the two exemplary embodiments otherwise correspond - apart from geometrical adaptations to the shape of the second sliding bearing 41, components which are identical and act in an identical manner bear the same reference numbers. In a modification to both exemplary embodiments, the second sliding bearing 41 on the inner side of the collar extension 19 is arranged in a region free from the hub 22, and the first wedge segment 27a which is subjected to a stronger load is mounted therein by means of an extension arm. The friction between the first wedge segment 27a and the collar extension 19 not only has an effect on the efficiency but also on the self-locking of the gear of the fitting 10. So that at least one of the two fittings 10 of the vehicle seat 1 remain self-locking in spite of the first wedge segment 27a being mounted in a sliding manner on two sides and, in the inoperative state, is locked against torques introduced on the output side, according to the invention, in the case of this fitting 10, a brake which is effective in the inoperative state of the fitting 10 is provided, namely a wrap spring brake 44, which is arranged in a wrap spring bushing 46 and, on account of its prestress, bears frictionally against the inner wall thereof. The wrap spring bushing 46, which is produced, for example, from an aluminum alloy or 11 from plastic, is arranged in a rotationally fixed manner on the second fitting part 12 by three groups of three radially (and/or axially) protruding wrap spring bushing arms 48 which are offset with respect to one another by 120° in each case engaging with a positive fit in the inner toothing produced on the rear side of the toothed wheel 16 by the embossing operation. For activation, the wrap spring brake 44 has a radially inwardly protruding wrap spring arm 50 at each of its ends. The first wedge segment 27a is provided with an axially protruding control cam 51 which is arranged between the two wrap spring arms 50 with play in the circumferential direction. "Between" or "within" is to be understood in each case as meaning an arrangement which relates to the smaller of the two possible angular ranges in the circumferential direction while "outside" relates to the larger of the two possible angular ranges in the circumferential direction. A bearing of the control cam 51 against a wrap spring arm 50 with subsequent action upon the latter acts in a closing manner on the wrap spring brake 44, i.e. brakes the wrap spring brake 44 - owing to an increasing outside diameter of the same and increased friction on the wrap spring bushing 46 - and prevents rotation of the components defining the eccentric relative to the second fitting part 12. With blockage of the eccentric, the first fitting part 11 is also fixed relative to the second fitting part 12. In order to cancel the braking action of the wrap spring brake 44 during driving of the driver 21, firstly, at the end of the driver segment 25 which is assigned to the first wedge segment 27a, a first driver cam 53 is provided on the driver 21 and, secondly, a second driver cam 55 is provided in the region which is arranged at approximately identical radial spacing between the ends of the driver segment 25, said driver cams both protruding axially. The wrap spring arms 50 together with the control cam 51 are arranged with play between the two driver cams 53 and 55 (within the context of the above 12 definition), i.e. the driver cams 53 and 55 are arranged in the circumferential direction outside the wrap spring arms 50. When the driver 21 is rotated, first of all one of the driver cams 53 or 55 passes to bear against a wrap spring arm 50 and acts upon the latter, which acts in an opening manner (releasing) on the wrap spring brake 44 - owing to a slightly reducing outside diameter of the same with reduced friction at the wrap spring bushing 46 - and cancels the braking action. As the movement continues, the eccentric drives the above-described rolling movement of the fitting parts 11 and 12 on each other. The third exemplary embodiment according to fig. 7 is identical to the previous exemplary embodiments, in particular to the second exemplary embodiment, unless described differently below, for which reason components which are identical or are essentially identical bear the same reference numbers. The driver 21, which is not changed in design, is mounted in the collar extension 19 of the first fitting part 11 while a sickle segment 127 is supported on the collar extension 19 (i.e. on the outer side thereof), said sickle segment being arranged in a sickle-shaped manner about a part of the collar extension 19 and, by means of its curved outer side, supporting the first sliding bearing 28, which is pressed into the second fitting part 12 in a rotationally fixed manner. In terms of its shape and function, the sickle segment 127 corresponds to an integral combination of the two wedge segments 27a and 27b. The driver segment 25 grasps with play between the narrow sides of the sickle segment 127. The securing ring 31 and the holding plates (not illustrated in the drawing) correspond to the previous exemplary embodiments. The sickle segment 127 defines an eccentric which is located in the force 13 flux between the fitting parts 11 and 12 and is mounted thereon. In an extension of the direction of eccentricity, the eccentric presses the toothed wheel 16 and the toothed ring 17 into each other at an engagement point defined in this manner. During driving by means of the rotating drive shaft, a torque is first of all transmitted to the driver 21 and then to the eccentric which is defined in this manner and which slides along the first sliding bearing 28 shifting the direction of eccentricity and therefore shifting the engagement point of the toothed wheel 16 in the toothed ring 17, which is depicted as a wobbling rolling movement of the fitting parts 11 and 12 on each other. Analogously to the previous exemplary embodiments, the efficiency of the fitting 10 depends noticeably on the friction between the sickle segment 127 and the collar extension 19. As in the second exemplary embodiment, the second sliding bearing 41, which is designed as a more or less completely closed ring, is provided to reduce this friction. The second sliding bearing 41 is either mounted immovably on the collar extension 19, for example is pressed in in a slotted embodiment or is adhering in a closed embodiment, and allows the sickle segment 127 to slide along with little friction, or the second sliding bearing 41 sits more or less immovably (adhering) on the sickle segment 127 and slides with little friction along the collar extension 19, i.e. corresponds in each case functionally to the first sliding bearing 28. So that, in the inoperative state, the fitting 10 remains self-locking and is locked against torques introduced on the output side, the wrap spring brake 44 is again provided. The wrap spring bushing 46 which receives it and holds it frictionally has wrap spring bushing arms 48 protruding radially all around, which can also be realized in the two previous exemplary embodiments. The wrap spring bushing arms 48 engage with a positive fit in the inner toothing produced on the rear side of the toothed wheel 16 by the 14 embossing operation. For activation, the wrap spring brake 44 again has the two wrap spring arms 50 while the sickle segment 127 is provided with the axially protruding control cam 51 which is arranged between the two wrap spring arms 50. The abovementioned definition for "between", "within" and "outside" applies. A bearing of the control cam 51 against a wrap spring arm 50 with subsequent action upon the latter acts on the wrap spring brake 44 in a closing manner. In order to cancel the braking action of the wrap spring brake 44 during driving of the driver 21, a first driver cam 53 and a second driver cam 55 are again provided on the driver 21 and receive the wrap spring arms 50 between them. When the driver 21 is rotated, first of all one of the driver cams 53 or 55 comes to bear against a wrap spring arm 50 and acts upon the latter, this acting on the wrap spring brake 44 in an opening (releasing) manner and canceling the braking action. During continued movement, the eccentric drives the above-described rolling movements of the fitting parts 11 and 12 on each other. The fourth exemplary embodiment according to figures 8 and 9 is similar to the previous exemplary embodiments, in particular the second exemplary embodiment, unless described differently below, for which reason components which are identical or are essentially identical bear the same reference numbers. The driver 21 firstly comprises a hub 22 for mounting with play in the collar extension 19 of the first fitting part 11 and for receiving the drive shaft in a central bore 23, the hub 22 having a covering disk on the end side which faces outward. Secondly, the driver 21 comprises a separately formed, perforated driver disk 224 which is connected in a rotationally fixed manner to the hub 22 and has two integrally formed driver segments 25 which are 15 arranged in a semicircular manner around part of the collar extension 19 and have a gap between them. An eccentric ring 226 is supported on the collar extension 19 and the two wedge segments 27a and 27b are supported in turn, by means of their curved inner side, on said eccentric ring and, by means of their curved outer sides, support a first sliding bearing 28 which is pressed into the second fitting part 12 in a rotationally fixed manner. The friction conditions are as in the previous exemplary embodiments. The two driver segments 25 grasp with play between the narrow sides of the wedge segments 27a and 27b while the mutually facing wide sides of the wedge segments 27a and 27b each support an angled end finger of an omega spring 30, the omega spring 30 being arranged on the other side of the driver disk 224 and the end fingers reaching through a slotted guide of the driver disk 224. The omega spring 30 pushes the wedge segments 27a and 27b apart in the circumferential direction and therefore positions the fitting 10 in the inoperative state in a manner free from play. The securing ring 31 and the holding plates (not illustrated in the drawing) correspond to the previous exemplary embodiments. The wedge segments 27a and 27b and the eccentric ring 226 define an eccentric which is located in the force flux between the fitting parts 11 and 12 and is mounted on the latter. As an extension of the direction of eccentricity, the eccentric pushes the toothed wheel 16 and the toothed ring 17 into each other at an engagement point defined in this manner. During driving by means of the rotating drive shaft, a torque is first of all transmitted to the driver 21 and then to the eccentric which is defined in this manner and slides along the first sliding bearing 28 shifting the direction of eccentricity and therefore shifting the engagement point of the toothed wheel 16 in the toothed ring 17, which is depicted as a wobbling rolling movement of the fitting parts 11 and 12 on each other. 16 Analogously, to the previous exemplary embodiments, the efficiency of the fitting 10 depends noticeably on the friction between the eccentric ring 226 and the collar extension 19. As in the second exemplary embodiment, the second sliding bearing 41, which is designed as a more or less completely closed ring, is provided to reduce this friction. The second sliding bearing 41 is either pressed onto the collar extension 19 and allows the eccentric ring 226 to slide along with little friction, or the second sliding bearing 41 sits more or less immovably on the eccentric ring 226 and slides with little friction on the collar extension 19, i.e. corresponds in each case functionally to the first sliding bearing 28. So that the fitting 10 remains self-locking in the inoperative state and is blocked against torques introduced on the output side, the wrap spring brake 44 is again provided. The wrap spring bushing 46 which receives it and holds it frictionally has wrap spring bushing arms 48 protruding radially all the way around. The wrap spring bushing arms 48 engage with a positive fit in the inner toothing produced on the rear side of the toothed wheel 16 by the embossing operation. For activation, the wrap spring brake 44 again has the two wrap spring arms 50 while the eccentric ring 226 is provided with the axially protruding control cam 51 which reaches through an opening in the driver disk 224 and is arranged in the circumferential direction between the two wrap spring arms 50. The abovementioned definition for "between", "within" and "outside" applies. A bearing of the control cam 51 against a wrap spring arm 50 with subsequent action upon the latter acts on the wrap spring brake 44 in a closing manner. In order to cancel the braking action of the wrap spring brake 44 during driving of the driver 21, a first driver cam 53 and a second driver cam 55 are again provided on the hub 22 and hold the wrap spring 17 arms 50 between them. When the driver 21 is rotated, one of the driver cams 53 or 55 first of all comes to bear against a wrap spring arm 50 and acts upon the latter, which acts on the wrap spring brake 44 in an opening (releasing) manner and cancels the braking action. During the further movement, the eccentric drives the above-described rolling movement of the fitting parts 11 and 12 on each other. The fifth exemplary embodiment according to figures 10 and 11 is similar to the previous exemplary embodiments, in particular the third exemplary embodiment, unless described differently below, for which reason parts which are identical or are essentially identical bear the same reference numbers. A solid eccentric 327 has a basic body which is in the shape of a cylindrical disk and which, by means of its outer side, supports the first sliding bearing 28, which is pressed into the second fitting part 12 in a rotationally fixed manner, and an integrally formed hub which is arranged eccentrically with respect to the center of the basic shape and is mounted in the collar extension 19 of the first fitting part 11 by means of the second sliding bearing 41. The second sliding bearing 41 is pressed, for example, into the collar extension 19 and allows the solid eccentric 327 to slide along with little friction (and is designed in this case as a closed ring) or sits more or less immovably on the solid eccentric 327 and slides with little friction in the collar extension 19 (and is designed in this case as a more or less completely closed ring). The second sliding bearing 41 corresponds in each case functionally to the first sliding bearing 28 and, owing to the reduced friction, influences the efficiency of the fitting 10 analogously to the previous exemplary embodiment. The driver 21 is mounted rotatably by means of its hub 22 within the hollow 18 hub of the solid eccentric 327 and is coupled to it for carrying it along by an idling path, i.e. the driver 21 carries along the solid eccentric 327 in the circumferential direction after passing through the idling path. The securing ring 31 and the holding plates (not illustrated in the drawing) correspond to the previous exemplary embodiments. The solid eccentric 327 forms an eccentric which is located in the force flux between the fitting parts 11 and 12 and is mounted on the latter. As an extension of the direction of eccentricity, the eccentric pushes the toothed wheel 16 and the toothed ring 17 into each other at an engagement point defined in this manner. During driving by means of the rotating drive shaft, a torque is first of all transmitted to the driver 21 and then to the eccentric which is defined in this manner and slides along the first sliding bearing 28 shifting the direction of the eccentricity and therefore shifting the engagement point of the toothed wheel 16 in the toothed ring 17, which is depicted as a wobbling rolling movement of the fitting parts 11 and 12 on each other. So that the fitting 10 remains self-locking in the inoperative state and is blocked against torques introduced on the output side, a wrap spring brake 44 is again provided. The wrap spring bushing 46 which receives it and holds it frictionally has wrap spring bushing arms 48 protruding radially all the way around. The wrap spring bushing arms 48 engage with a positive fit in the inner toothing produced on the rear side of the toothed wheel 16 by the embossing operation. For activation, the wrap spring brake 44 again has the two wrap spring arms 50 while the solid eccentric 327 is provided with the axially protruding control cam 51 which is arranged between the two wrap spring arms 50. The abovementioned definition for "between", "within" and "outside" applies. A 19 bearing of the control cam 51 against a wrap spring arm 50 with subsequent action upon the latter acts on the wrap spring brake 44 in a closing manner. In order to cancel the braking action of the wrap spring brake 44 during driving of the driver 21, a first driver cam 53 and a second driver cam 55 are again provided on the driver 21 and hold the wrap spring arms 50 between them. When the driver 21 is rotated, first of all one of the driver cams 53 or 55 comes to bear against a wrap spring arm 50 and acts upon the latter, which acts on the wrap spring brake 44 in an opening (releasing) manner and cancels the braking action. During further movement, the eccentric drives the above-described rolling movement of the fitting parts 11 and 12 on each other. For all of the exemplary embodiments, a modification is possible, according to which one wrap spring brake 44 is provided per direction of rotation, said wrap spring brakes closing in opposite directions. A wrap spring arm 50 of each wrap spring brake 44 is then fitted or attached in some other way, preferably in a manner free from play, on the first wedge segment 27a, sickle segment 127, solid eccentric 327 or the respective control cam 51 while the two other wrap spring arms 50 are acted upon by a respective driver cam 53 or 55 - after passing through a small idling path, which is illustrated schematically in fig. 12. During driving of the driver 21, one of the two wrap spring brakes 44 is opened (released) by the driver cam 53 or 55 and the other by the first wedge segment 27a etc. The two wrap spring brakes 44 are preferably arranged axially next to each other in the same wrap spring bushing 46, as illustrated in fig. 13. For all of the exemplary embodiments, a further modification is possible, according to which the wrap spring bushing is formed integrally with the second fitting part 12 by the material region which forms the bearing opening to receive the first sliding bearing 28 being somewhat extended 20 axially in the manner of a collar extension and, by means of its outer side, i.e. its rear side which faces away from the supporting side, holding the wrap spring brake 44. With the arrangement of the wrap spring brake 44 on the outer side of the wrap spring bushing, the manner of operation of the wrap spring brake 44 is reversed, i.e. an increase of the diameter acts in an opening (releasing) manner while a contraction with reduction of the diameter acts in a closing (braking) manner. Accordingly, two radially outwardly protruding control cams 51 are provided on the first wedge segment 27a, sickle segment 127 or solid eccentric 327 and hold the wrap spring arms 50 between them (within the meaning of the abovementioned definition for "between", "within" and "outside") and the driver cam 53 is then arranged between said wrap spring arms 50. In the case of two wedge segments 27a and 27b, the already mentioned mounting of the first wedge segment 27a is by means of an extension arm in the collar extension 19 (on its inner side) and of the second wedge segment 27b on the collar extension 19 (on its outer side). 21 List of reference numbers 1 Vehicle seat 3 Seat part 4 Backrest 5 Hand wheel 10 Fitting 11 First fitting part 12 Second fitting part 16 Toothed wheel 17 Toothed ring 19 Collar extension 21 Driver 22 Hub 23 Bore 25 Driver segment 27a First wedge segment 27b Second wedge segment 28 First sliding bearing 30 Omega spring 31 Securing ring 41 Second sliding bearing 44 Wrap spring brake 46 Wrap spring bushing 48 Wrap spring bushing arms 50 Wrap spring arm 51 Control cam 53 First driver cam 55 Second driver cam 127 Sickle segment 22 224 Driver disk 226 Eccentric ring 327 Solid eccentric 23 WE CLAIM: 1. A fitting for a vehicle seat, in particular for a motor vehicle seat, with a first fitting part (11), a second fitting part (12) in geared connection with the first fitting part (11), an eccentric (27a, 27b; 127; 327) which is mounted rotatably on the fitting parts (11, 12) and is intended for driving a rolling movement of first fitting part (11) and second fitting part (12), a driver (21) for driving the eccentric (27a, 27b; 127; 327) and a brake for locking the fitting (10) in the inoperative state against torques introduced on the output side, characterized in that at least one wrap spring brake (44) is provided as the brake and is activated by the driver (21) and/or the eccentric (27a, 27b; 127; 327). 2. The fitting as claimed in claim 1, characterized in that, for activation, the wrap spring brake (44) has two wrap spring arms (50). 3. The fitting as claimed in one of the preceding claims, characterized in that the driver (21) acts on the wrap spring brake (44) in an opening manner and releases the latter during driving. 4. The fitting as claimed in claims 2 and 3, characterized in that the driver (21) has at least one driver cam (53, 55) which, upon bearing against a wrap spring arm (50) and acting upon the latter, acts on the wrap spring brake (44) in an opening manner. 5. The fitting as claimed in one of the preceding claims, characterized in that the eccentric (27a, 27b; 127; 327) acts on the wrap spring brake (44) in a closing manner. 6. The fitting as claimed in claims 2 and 5, characterized in that the 24 eccentric (27a, 27b; 127; 327) has a control cam (51) which, upon bearing against a wrap spring arm (50) and acting upon the latter, acts on the wrap spring brake (44) in a closing manner. 7. The fitting as claimed in one of the preceding claims, characterized in that the wrap spring brake (44) bears against a wrap spring bushing (46) which is rotationally fixed with respect to the second fitting part (12), or bears against a wrap spring bushing (46) formed integrally with the second fitting part (12). 8. The fitting as claimed in claim 7, characterized in that the separately formed wrap spring bushing (46) has a plurality of radially protruding wrap spring bushing arms (48) which engage with a positive fit in an inner toothing of the second fitting part (12). 9. The fitting as claimed in claim 7, characterized in that a collar extension, which serves to support the eccentric (27a, 27b; 127; 327), serves with its rear side, which faces away from the supporting side, as the integrally formed wrap spring bushing. 10. The fitting as claimed in one of the preceding claims, characterized in that the wrap spring brake (44) is integrated structurally into the fitting (10). 11. The fitting as claimed in one of the preceding claims, characterized in that the eccentric (27a, 27b; 127; 327) is mounted with little friction both on the first fitting part (11) and on the second fitting part (12), in particular by means of a sliding bearing (28, 41) and/or rolling bearing and/or surface processing and/or surface treatment. 25 12. The fitting as claimed in one of the preceding claims, characterized in that the eccentric (27a, 27b; 127; 327) is defined at least by two wedge segments (27a, 27b) or by a sickle segment (127) or is designed as a solid eccentric (327). 13. The fitting as claimed in one of the preceding claims, characterized in that a respective wrap spring brake (44) is provided for both directions of rotation of the driver (21). 14. An angle-adjustable seat component (3, 4) of a vehicle seat, in particular motor vehicle seat, with a fitting (10) as claimed in one of the preceding claims for adjusting an angle within the seat component (3, 5) or relative to another seat component (3, 4). 15. A vehicle seat, in particular motor vehicle seat, with at least one angle-adjustable seat component (3, 4) as claimed in claim 14. 26 The invention relates to a fitting (10) for a vehicle seat, more particularly for a motor vehicle seat, comprising a first fitting part (11), a second fitting part (12) that is in geared connection with the first fitting part (11), a cam (27a, 27b: 127:327) that is rotatably mounted on the first fitting parts (11, 12) for driving a rolling movement of the first fitting part (11) the second fitting part (12), a driver (21) for driving the cam (27a, 27b; 127; 327) and a brake for locking the fitting (10) against torque introduced at the output side in the rest state, at least one wrap-spring brake (44) being provided as brake, said brake controlling the driver (21) and the cam (27a, 27b; 127; 327). |
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01859-kolnp-2007-correspondence others 1.1.pdf
01859-kolnp-2007-correspondence others 1.2.pdf
01859-kolnp-2007-correspondence others 1.3.pdf
01859-kolnp-2007-correspondence others.pdf
01859-kolnp-2007-description complete.pdf
01859-kolnp-2007-form 1 1.1.pdf
01859-kolnp-2007-form 3 1.1.pdf
01859-kolnp-2007-form 5 1.1.pdf
01859-kolnp-2007-international publication.pdf
01859-kolnp-2007-international search report.pdf
01859-kolnp-2007-priority document 1.1.pdf
01859-kolnp-2007-priority document.pdf
1859-KOLNP-2007-(01-06-2012)-CORRESPONDENCE.pdf
1859-KOLNP-2007-ABSTRACT 1.1.pdf
1859-KOLNP-2007-AMANDED CLAIMS.pdf
1859-KOLNP-2007-CORRESPONDENCE 1.1.pdf
1859-KOLNP-2007-CORRESPONDENCE 1.2.pdf
1859-kolnp-2007-correspondence-1.3.pdf
1859-KOLNP-2007-CORRESPONDENCE.pdf
1859-KOLNP-2007-DESCRIPTION (COMPLETE) 1.1.pdf
1859-KOLNP-2007-DRAWINGS 1.1.pdf
1859-KOLNP-2007-EXAMINATION REPORT REPLY RECIEVED.pdf
1859-KOLNP-2007-EXAMINATION REPORT.pdf
1859-KOLNP-2007-FORM 1-1.1.pdf
1859-KOLNP-2007-FORM 1-1.2.pdf
1859-KOLNP-2007-FORM 13-1.1.pdf
1859-KOLNP-2007-FORM 2-1.1.pdf
1859-KOLNP-2007-FORM 3-1.1.pdf
1859-KOLNP-2007-FORM 5-1.1.pdf
1859-KOLNP-2007-FORM 5-1.2.pdf
1859-KOLNP-2007-FORM 5-1.3.pdf
1859-KOLNP-2007-GRANTED-ABSTRACT.pdf
1859-KOLNP-2007-GRANTED-CLAIMS.pdf
1859-KOLNP-2007-GRANTED-DESCRIPTION (COMPLETE).pdf
1859-KOLNP-2007-GRANTED-DRAWINGS.pdf
1859-KOLNP-2007-GRANTED-FORM 1.pdf
1859-KOLNP-2007-GRANTED-FORM 2.pdf
1859-KOLNP-2007-GRANTED-LETTER PATENT.pdf
1859-KOLNP-2007-GRANTED-SPECIFICATION.pdf
1859-KOLNP-2007-OTHERS 1.1.pdf
1859-KOLNP-2007-OTHERS 1.2.pdf
1859-KOLNP-2007-PRTITION UNDER RULE 137.pdf
1859-KOLNP-2007-REPLY TO EXAMINATION REPORT-1.1.pdf
Patent Number | 248341 | |||||||||||||||||||||||||||
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Indian Patent Application Number | 1859/KOLNP/2007 | |||||||||||||||||||||||||||
PG Journal Number | 27/2011 | |||||||||||||||||||||||||||
Publication Date | 08-Jul-2011 | |||||||||||||||||||||||||||
Grant Date | 05-Jul-2011 | |||||||||||||||||||||||||||
Date of Filing | 24-May-2007 | |||||||||||||||||||||||||||
Name of Patentee | KEIPER GMBH & CO. KG | |||||||||||||||||||||||||||
Applicant Address | HERTELSBRUNNENRING 2, 67657 KAISERSLAUTERN | |||||||||||||||||||||||||||
Inventors:
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PCT International Classification Number | B60N 2/225 | |||||||||||||||||||||||||||
PCT International Application Number | PCT/EP2006/005255 | |||||||||||||||||||||||||||
PCT International Filing date | 2006-06-02 | |||||||||||||||||||||||||||
PCT Conventions:
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