Title of Invention

WIPER BLADE FOR CLEANING THE PANES OF A MOTOR VEHICLE

Abstract

The present invention relates to the proposal which is for a wiper blade which is used for cleaning windows, preferably of motor vehicles. The wiper blade has an elongate rubber-elastic wiper strip which can be placed against the window and is arranged parallel to the longitudinal axis on an elongate, resilient supporting element, to which a device for connecting the wiper blade to a driven wiper arm is directly connected. The supporting element has to band-type spring rails, which are arranged in a plane situated in front of the window and essentially parallel to the window, whose one, lower band surfaces (sic) face the window, whose mutually adjacent inner longitudinal edges each enter a longitudinal groove, which is assigned to each longitudinal edge and is open towards each longitudinal side of the wiper strip, at a distance from one another and are connected to one another by at least two transverse webs arranged at a distance from one another in the longitudinal direction.

Full Text

The invention relates to wiper blades for windows of preferably motor vehicles where, the supporting element is intended to ensure that the wiper-blade contact pressure on the window emanating from a wiper are connected to the wiper blade is distributed as uniformly as possible over the entire are wiped by the wiper blade. By means of an appropriate curvature of the unloaded supporting element - i.e. when the wiper blade is not resting on the window - the ends of the wiper strip, which rests fully on the window when the wiper blade is in wiping mode, loaded towards the window by the supporting element, which is then stressed, even if the radii of curvature of spherically curved vehicle windows vary in each position of the wiper blade. The curvature of the wiper blade has therefore to be somewhat sharper than the sharpest curvature measured in the wiped are on the window to be wiped. The supporting element thus replaces the complex supporting-bracket structure with two spring rails arranged in the wiper strip, as employed in conventional wiper blades (DE-A 15 05 357). The invention starts from a wiper blade in accordance with the precharacterizing clause of claim 1. In the case of a known wiper blade of this kind (German Utility Model 29611722.6), the two spring rails are connected integrally by transverse webs arranged at their two ends. Since these transverse webs are situated in the plane of the spring rails, the slot situated between the mutually facing longitudinal edges and surrounded by the spring rails and the transverse webs has to be widened sufficiently in one of its end sections to allow the wiper strip to be mounted correctly in the slot. However, this widening for mounting purposes may have a disadvantageous effect on the spring properties of the supporting element as regards the wiping outcome to be achieved. The manual insertion of the wiper strip into the slot via this widened portion is also costly. Advantages of the invention In the case of the wiper blade according to the invention, it is possible to introduce the wiper strip rectilinearly between the two mutually facing longitudinal edges of the spring rail from one end of the supporting element, the inner, free edge strips of the said spring rail entering into the longitudinal grooves of the wiper strip. This simple movement for mounting purposes can be executed without any problem by an automatic mounting machine, thereby considerably lowering costs. The disadvantageous widening of the slot for mounting purposes can also be omitted because the bridge-type transverse webs make it possible for the wiper strip to be moved rectilinearly for mounting purposes from one end of the supporting element. If the transverse webs are designed as separate components and are connected fixedly to the spring rails, advantages in the manufacturing of the wiper blade arise. For the connection between the spring rails and the transverse webs, it is expedient if the transverse webs are fastened on the upper band surfaces of the two spring rails. A stable, durable connection between the spring rails and the transverse webs is achieved by welding these individual components together. In order for it to be possible for the wiper blade and its wiper strip to be adapted during the wiping mode to the particular curvature of the window without any * trouble, itater than the length of the wiper strip because then, by means of appropriate configurations, a certain, advantageous ability of the wiper strip to move lonan be ensured. A stable supporting elegitudinally with respect to the supporting element c has proven advantageous if the length of the spring rails is grement with hardly any twisting is achieved if a transverse web is arranged at least on each end section of the two spring rails belonging to each other. However, it is entirely conceivable, depending on the length of the wiper blade, to connect the two spring rails to each other by means of further, bridge-type transverse webs. In the case of short wiper blades, it has been proven that the arrangement of a single transverse web on each end section of the supporting element is sufficient in order to achieve a stable, twist-free wiper blade. The supporting element is further stabilized if a transverse web arranged in the central region of the two spring rails belonging to each other is designed as part of a connecting device for connecting the wiper blade to the wiper arm. In a development of the invention, at least one of the two transverse webs arranged on one of the end sections of the spring rails has a stop which is connected to the central section thereof and partially covers over that end side of the wiper strip which is adjacent to it. This prevents the wiper strip from migrating out of the supporting element in the longitudinal direction of the wiper blade. In the case of the arrangement of a transverse webs [sic] , which are each provided with a stop, at the two ends of the supporting element, in order for the wiper strip to be readily adapted to the particular curvature of the window, the distance between the two stops is greater than the length of the wiper strip. In order to reduce the risk of injury when handling the window wiper, each transverse web arranged on the end sections of the two spring rails is provided with a covering cap, which is preferably manufactured from plastic. Further advantages during the wiping mode of the window wiper according to the invention arise by virtue of the fact that the thickness of a wall or web strip between the two longitudinal grooves in the wiper strip is less than the distance between the mutually adjacent longitudinal edges of the two spring rails belonging to each other. In conjunction with the longitudinal play of the wiper strip in the supporting element, a "freely floating", stress-free wiper strip is therefore produced, which can be adapted continuously without any adverse effect to the profile of the window during the wiping mode by means of a clamping-type mount. A particularly advantageous development of the wiper blade is produced if the wiper strip, which has a constant cross section over its longitudinal extent, has a strip-type wiping lip, which can be placed against the window and is connected via a narrow web strip, that is formed by groove-type constrictions arranged opposite one another, to a covering strip held on the supporting element, and each of the two mutually adjacent, inner longitudinal edges of the spring rails is arranged in one of the two groove-type constrictions of the wiper strip. This considerably reduces the overall height of the wiper blade. Since the width of the constricting groove in one subregion is wider than the thickness of the spring rails, the wiping lip can always tilt into the required dragging position during the wiping mode. In this case, it is particularly advantageous if the lateral boundary surfaces of the groove-type constrictions diverge from the web strip to the longitudinal sides of the wiper strip. Thus, with appropriate coordination, the spring rails can guide the wiper strip on the web strip and can simultaneously enable the wiping lip to undergo its necessary tilting movement in the dragging position. One development of the invention makes provision for the one lateral boundary surface of the groove-type constrictions to have a spherical profile, as seen in cross section. This enables a favourable and low-noise rolling movement of this side wall along the band surface, which faces it, of the relevant spring rail. This advantage can be improved still further if the two lateral boundary surfaces of the groove-type constrictions have a spherical profile, as seen in cross section. In order to assist in an optimum resting of the wiper strip against the preferably spherically curved window to be wiped, according to one embodiment of the invention the wiping lip has a longitudinal channel closed all the way around. In order to render superfluous particular measures for the fastening of a connecting device for a wiper arm moving the wiper blade, each of the two spring rail [sic] protrudes at least with a central edge strip out of its groove-type constriction, so that the connecting device can be fastened on the exposed edge strips. Further advantageous developments and refinements of the invention are given in the following description of exemplary embodiments illustrated in the associated drawing. Drawing In the drawing, Figure 1 shows a side view of a wiper blade according to the invention, Figure 2 shows an extended illustration of the wiper blade shown in Figure 1, drawn in perspective and in scale [sic], Figure 3 shows, in an enlarged, extended, perspective illustration, a supporting element which belongs to the wiper blade according to the invention and is illustrated in shortened form, Figure 4 shows, in an enlarged illustration, the cut surface of a section along the line IV-IV in Figure 2, Figure 5 shows, in an enlarged illustration, a detail which is denoted by V in Figure 2, Figure 6 shows the cut surface of a section shown in Figure 4 through another embodiment of the wiper blade according to the invention, Figure 7 shows a detail, corresponding to Figure 5, of the wiper blade shown in Figure 6, Figure 8 shows the cut surface of a section shown in Figures 4 and 6 through a further embodiment of the wiper blade according to the invention, Figure 9 shows, in an enlarged illustration, a basic illustration of the cut surface of a section along the line IX-IX in Figure 2 through a wiper blade according to the invention, where the latter has been placed onto the surface of the window to be wiped, Figure 10 shows the wiper blade shown in Figure 9 during the wiping mode in the one wiping direction, and Figure 11 shows the wiper blade in Figure 9 during the wiping mode in the other wiping direction. Description of the exemplary embodiments A wiper blade 10 shown in Figures 1 and 2 has a resilient supporting element 12, which is elongate in the manner of a band and on the underside 13 of which an elongate, rubber-elastic wiper strip 14 is arranged parallel to the longitudinal axis. Arranged on the upper side 11 of the supporting element 14, which may also be referred to as a spring beam, in the central section of the latter, is the wiper-blade part 16 of a • connecting device, with the aid of which the wiper blade 10 can be connected releasably in an articulated manner to a driven wiper arm 18, which is indicated in chain-dotted lines in Figure 1. For this purpose, the wiper arm 18 is provided at its free end wi th the wiper-arm part of the connecting device. The wiper arm 18 is loaded in the direction of the arrow 20 towards the window to be wiped - towards the windscreen of a motor vehicle, for example - whose surface to be wiped is indicated in Figure 1 by a chain-dotted line 22. Since the line 22 is intended to illustrate the sharpest curvature of the window surface, it is clearly apparent that the curvature of the as yet unloaded wiper blade 10, which rests with its two ends on the window, is sharper than the maximum curvature of the window (Figure 1). Under the contact pressure (arrow 20) , the wiper blade 10 comes to rest against the window surface 22 over its entire length by means of its wiping lip 24. At the same time, a stress builds up in the resilient supporting element 12, which is manufactured from metal for example, this stress ensuring proper contact of the wiper strip 14 or wiping lip 24 with the window over its entire length and ensuring uniform distribution of the contact pressure. A first embodiment of the wiper blade 10 will be explained in greater detail below with reference to Figures 3 to 5. From Figure 4 it can be seen that the supporting element 12 of the wiper blade 10 lies in front of the window 22 to be wiped, at a distance 26. At the same time, its arrangement is such- that its band surfaces 11 and 13 are in a plane extending essentially parallel to the window surface 22 to be wiped. The particularly advantageous construction of the supporting element 12 is especially apparent from Figures 3 and 4. The said supporting element has two band-type spring rails 2 8 and 30 which lie in a common plane and are aligned parallel to one another. The mutually facing inner longitudinal edges 32 are at a distance 34 from one another. At each of the two ends of the spring rai 1 s 28, 30, they are connected to one another by a bridge-type transverse web 36 or 38; for example, are welded to one another. In this arrangement, each bridge-type transverse web rests with its end sections 40 on the upper side 11 of the supporting element 12 or on its spring rails 28, 30. Each of the two transverse webs 36 or 28 [sic] has a central section 42, which is at a distance 44 from the upper band surface 11 of the spring rails and thus forms the basis of its bridge-type form. Since the longitudinal extent 46 of the central sections 42 is greater than the distance 34 between the mutually facing inner longitudinal edges 32, the two spring rails 28 and 30 extend with inner edge strips 48 into the region of the central portions 42, the edge strips 48 being arranged underneath the central sections 42, at a distance 44. Apart from the already-mentioned tasks of the supporting element 12 as regards distribution of the bearing force, is also intended to ensure correct, stress-free guidance of the wiper strip 14 during the wiping mode. This also ensures a low-noise wiping mode. The wiper strip 14 of this first embodiment has a cross section which will be made clear with reference to Figure 4. If it has a top strip 50, to which the wiping lip 24, which performs the actual wiping work, is connected by means of a narrow web strip 52. The arrangement of the web strip 52 allows the wiping lip 24 to tilt into a dragging position, which promotes the wiping work and will be explained later on. The top strip 50 is provided on its mutually opposite longitudinal sides with longitudinal grooves 54 and 56, which are open at the edges to the said longitudinal sides. The longitudinal grooves 54 and 56 serve to accommodate the inner edge strips 48 of the spring rails 28 and 30. The depth of the longitudinal grooves 54 and 56 is chosen in such a way that a wall 58 * remains between the two longitudinal grooves. The top strip 50 thus has a base strip 60 and a covering strip 62, which are both connected to each other by the wall 58. The thickness 64 of the wall 58 is less than the distance 34 between the inner longitudinal edges 32 of the spring rails 28, 30 or less than the distance between the inner edge strips 48 thereof. The width of the two longitudinal grooves 54 and 56 in the top strip 50 is matched to the thickness of the spring rails 28, 30 or their inner edge strips 48 in such a way that stress-free retention of the wiper strip on the supporting element 12 is ensured when the wiper strip shown in Figure 4 is assembled with the supporting element 12 shown in Figure 3. Since the width 66 of the covering strip 62 is also somewhat less than the longitudinal extent 46, which is also referred to as bridge width, of the central section 42, and its thickness 67 is less than the distance 44 between the central section 42 and the upper sides 11 of the spring rails 28, 30, the wiper strip 14, which has a constant cross section over its entire longitudinal extent, can be inserted into the supporting element 12 in the longitudinal direction without difficulty and can thus be connected to the latter. A further characteristic of the wiper blade according to the invention is illustrated in Figure 5. This shows that the transverse web 70, which is arranged at one end of the supporting element, is provided on its side facing the end of the wiper blade, in its central section, with a stop 74 which is connected to it and at least partially covers over the end side 72 adjacent to it. In this arrangement, the stop 74 is formed by a bent-over, tab-type extension of the central section 42. If each of the two ends of the wiper blade or each of the two ends of the supporting element is provided with a transverse web 70 shown in Figure 5, care should be taken to ensure that the distance between the mutually facing inner walls 75 of the stop tabs 74 is somewhat greater than the length 76 of the wiper strip 14 (Figure 2) . This may, for example, also be achieved by the length 78 of the supporting element 12 being slightly greater than the length 76 of the wiper strip 14. Arrangement of the stops 74 on both sides therefore forms an effective means of securing the wiper strip 14 from migrating out of its supporting element 12 in the longitudinal direction during the wiping mode. Of course, in such a case the bending over of at least one of the two stop tabs 74 is undertaken only after the wiper strip 14 has been introduced into the supporting element 12 . That part 16 of the connecting device for the wiper arm which is arranged in the central section of the wiper blade 10 reaches around the respective outer, outer [sic] edge strips 80 of the spring rails 28, 30 or supporting element 12, which edge strips 80 protrude over the longitudinal grooves 54 and 56. The connection between the part 16 and the supporting element 12 can be form- and/or force-locking. Given an appropriate length of the wiper blade, it may also be expedient if further corresponding transverse webs are arranged between the two transverse webs 36 and 38 arranged at the ends. To avoid injury in handling the wiper blade, especially to the end user, a covering cap 82, which is preferably manufactured from plastic, is arranged on the two spring rails 28, 30 and the transverse webs 36, 38 at the ends, preferably being snapped on, preferably being snapped on [sic] (Figures 1 and 2). Further embodiments of the wiper blade according to the invention are illustrated in Figures 6 to 8. The supporting elements of these embodiments fully correspond to the supporting elements 12 from Figures 3 to 5 which have already been mentioned, and so the reference numbers used for them in these figures can be directly transferred. However, the configuration of the • wiper strip 100 in this embodiment differs fundamentally from the construction of the wiper strip 14 in the embodiment which has already been described. As Figure 6 in particular shows, the wiper strip 100 has just one wiping lip 101 which is connected integrally to a covering strip 104 via a web strip 102. The basic strip 60 present in Figures 4 and 5 in the case of the exemplary embodiment which has already been described is therefore omitted. The inner edge strips 48 of the spring rails 28 and 30 lie in groove-type constrictions 106 of the wiper strip 100, which constrictions are necessary to form the narrow web strip 102. The lateral boundary surface 108 of the constriction 106, which surface is formed on the covering strip 104, therefore faces the upper band surface 11 of the supporting element 12. The other lateral boundary surface 110 of the groove-type constriction 106 therefore lies directly opposite the lower band surface 13 of the supporting element 12. It is therefore apparent that each of the two inner longitudina1 edges 32 of the two spring rails 28, 30 or the supporting element 12 is arranged in one of the two groove-type constrictions 106 of the wiper strip 100. It is furthermore apparent, particularly from Figure 6, that the two lateral boundary surfaces 110 of the constrictions 106 are of spherical design and are arranged in such a way that the extent of the width of the groove-type constrictions 106 is wider, at least over an outer subregion, than the thickness of the spring rails 28, 30. It is thus possible for the wiping lip 101 to be able to tilt into the sought after, advantageous dragging position during the wiping mode. In the case of this embodiment of the wiper blade according to the invention too, the width 112 of the web strip 102 is coordinated in such a manner with the distance 34 between the mutually facing, inner longitudinal edges 32 of the spring rails 28, 30 that an air gap is left between the web strip and the spring rails. Furthermore, in this case too the thickness 114 of the covering strip 104 is somewhat less than the distance 44 between the central section 42 of the transverse web 36 and the inner edge strip 48. The width 116 of the covering strip 104 is also somewhat less than the longitudinal extent 46 of the central section 42 of the bridge-type transverse webs 36. It is thereby possible to introduce the wiper strip 100, which has a constant cross section over its entire length, in its longitudinal extent into the supporting element 112 without any impediment, with the result that the mounting position illustrated in Figure 6 is attained. In this embodiment too, the plane into which the supporting element 12 extends is situated at a distance 26 from the surface 22 of the window 22 to be wiped. As already described with reference to Figure 5, in the case of this embodiment of the wiper blade according to the invention too, each of the two bridge-type transverse webs 7 0 can be provided with a bent-over stop 74 at its outer ends, as seen in the longitudinal extent of the wiper blade, and so after the wiper strip 14 has been introduced into the supporting element 12 and the stop flaps 74 have been bent over, a reliable means of securing the wiper strip 100 longitudinally in the supporting element 12 is ensured. It is clear that even - in this embodiment, the distance between the mutually facing inner walls 75 of the stop tabs 74 has to be somewhat greater than the length 76 of the wiper strip. A further embodiment of the wiper blade according to the invention will be explained with reference to Figure 8. The embodiment according to Figure 8 corresponds in its basic construction to the construction of the embodiment described with reference to Figure 6. However, in a deviation from the embodiment according to Figure 6, in the case of this embodiment, not only are the lateral boundary surfaces * 110 of spherical design, but so too are the other lateral boundary surfaces 108 of the groove-like constrictions 106, which surfaces 108 are formed on the covering strip 104. Furthermore, the embodiment according to Figure 8 also differs from the embodiment according to Figure 6 by a continuous longitudinal channel 118 which is arranged in the wiping lip 101 and is closed all the way around. The arrangement of the longitudinal channel 118 in the wiping lip can ensure, by itself or in conjunction with further longitudinal grooves, that the wiping lip turns over gently and in a manner low in noise during the wiping mode. Also, the arrangement of the said longitudinal channel is not necessarily required in conjunction with the spherical design of the boundary surfaces 108, 110. As can be seen from Figures 2 and 3, the width of the supporting element 12 is the same over the entire longi tudinal extent. However, it is also conceivable for the supporting element to taper towards the end sections of the wiper blade. In order for it to be possible for the part 16 to be fastened on the wiper blade, it suffices if each spring rail 28, 30 protrudes with at least one central, outer edge strip 80 out of its groove-type constriction, with the result that part 16 of the connecting device can be fastened on this edge strip 80. It is also conceivable that instead of a supporting element 12 according to Figure 3, the two spring rails can be designed as separate components and can be arranged in the groove-type constrictions of the wiper strip. The ensuring particularly of1 the extent of the distance 34 can be taken over by other components which are not illustrated. Figures 9 to 11 show basic cut-surface illustrations of the wiper blade according to Figures 6 and 7, cut along the line IX-IX in Figure 2, the wiper blade 10 in Figure 9 being placed only by its wiping lip 101 onto the window surface 22 to be wiped. The wiper strip 100 is held with play between the inner longitudinal edges 32 of the two spring rails 28, 30 (cf. Figures 3 and 4 too) . Since the length 76 of the wiper strip 100 is also somewhat less than the length 78 of the supporting element 12 or less than the extent between the mutually facing inner walls 75 of the stops 74 at the two ends of the supporting element 12, what is referred to as "free-floating", stress-free, but operationally secure retention of the wiper strip 100 in the supporting element 12 results. If, during the wiping mode, the wiper blade 10 is moved under loading by the contact pressure (arrow 20 in Fig. 1) over the window 22 in the direction, of the arrow 122 in Fig. 10, the wiping lip 101 tilts in the region of the web strip 102 into an advantageous dragging position, in which case the supporting element 12 comes somewhat nearer the window (arrow 123) . The tilting movement is restricted by the fact that the one lateral boundary surface 110 of the one groove-type constriction 106 is supported on the underside 13 of the one spring rail 30. When the wiper blade 10 has reached its reversing position and is moved in the opposite direction (arrow 124 in Fig. 11) by the wiper arm 18, the wiping lip 101 tilts via an intermediate position, which can be seen in Figure 9, into its other dragging position (Fig. 11), in which case the wiping lip 101 is supported with the lateral boundary surface 110 of the other groove-type constriction 106 on the underside 13 of the other spring rail 28. If the dragging positions of the wiping lip 101 in the vicinity of its reversing positions comes [sic] closer to the window - on account of the customarily spherical curvature of the windscreen 22, the boundary surfaces 110, which are of spherical design, roll noiselessly along the undersides 13 of the spring rails 28, 30. Correspondingly, it is also possible - if necessary - for the other spherical boundary surfaces 108 of the groove-type constrictions 106 to roll along the upper sides 11 of the spring rails 28 and 30. WE CLAIM : 1. A wiper blade (10) for windows, preferably of motor vehicles, having an elongate, rubber-elastic wiper strip (14) which can be placed against the window (22) and is arranged parallel to the longitudinal axis on an elongate, resilient supporting element (12), to which a device for connecting the wiper blade to a driven wiper arm (18) is directly connected, the supporting element (12) having two band-type spring rails (28, 30), which are arranged in a plane situated in front of the window and essentially parallel to the window and whose lower band surfaces (13) face the window, whose mutually adjacent inner longitudinal edges (48) each enter a longitudinal groove (54, 56 or 106), which is assigned to each longitudinal edge and is open towards the longitudinal side of the wiper strip (14), at a distance from one another and are connected to one another by at least two transverse webs (36, 38) arranged at a distance from one another in the longitudinal direction, each transverse web (36, 38) having a central section (42) which extends at a distance (44) from the upper band surfaces (11) of the spring rails (28, 30), resulting in bridge-type transverse webs (36,38) and the distance (34) between the two longitudinal rails (28, 30) being less than the bridge width (46), wherein the transverse webs (36, 38) are fastened on the upper band surfaces (11) of the two spring rails (28, 30) and are welded to the two spring rails (28, 30), so that the wiper strip can be introduced rectilinearly between the two mutually facing longitudinal edges of the spring rails from one end of the supporting element. 2. The wiper blade as claimed in claim 1, wherein the transverse webs (36, 38) are separate components and are connected fixedly to the two spring rails (28, 30). 3. The wiper blade as claimed in claim 1 to 2, wherein the length (78) of the spring rails is greater than the length (76) of the wiper strip (14). 4. The wiper blade as claimed in claim 1 to 3, wherein a transverse web (36, 38) is arranged at least on each end section of the two spring rails (28, 30) belonging to each other. 5. The wiper blade as claimed in claim 4, wherein a transverse web arranged in the central region of the two spring rails (28, 30) belonging to each other is designed as part (16) of a connecting device for connecting the wiper blade (10) to the wiper arm(18) 6. The wiper blade as claimed in either of Claims 4 and 5, wherein at least one of the two trans verse webs (70) arranged on an end section of the spring rails (28, 30) is provided with a stop (74), which is connected to the central section (42) there of and at least partially covers over that end side (72) of the wiper strip which is adjacent to it. 7. The wiper blade as claimed in claim 6, wherein the two transverse webs (36, 38) which are arranged at the ends of the supporting element (12) are provided with a stop (74). 8. The wiper blade as claimed in claim 1 to 7, wherein each transverse web (36, 38 or 70) arranged on the end sections of the two spring rails (28, 30) is provided with a covering cap (82), which is preferably manufactured from plastic. 9. The wiper blade as claimed in claim 1 to 8, wherein the thickness (64) of a wall (58) between the two longitudinal grooves (54, 56) in the wiper strip (14) is less than the distance (34) between the mutually adjacent longitudinal edges (32) of the two spring rails (28, 30) belonging to each other. 10. The wiper blade as claimed in claim 1 to 9, wherein the wiper strip (100), which has a constant cross section over its longitudinal extent, has a strip-type wiping lip (101), which can be placed against the window and is connected via a narrow web strip (102), that is formed by groove- type constrictions (106) arranged opposite one an other, to a covering strip (104) held on the supporting element (12), and in that each of the two mutually adjacent, inner longitudinal edges (32) of the spring rails (28, 30) is arranged in one of the two groove-type constrictions (106) of the wiper strip (100). 11. The wiper blade as claimed in claim 10, wherein the lateral boundary surfaces (108, 110) of the groove-type constrictions (106) diverge from the web strip (102) to the longitudinal sides of the wiper strip. 12. The wiper blade as claimed in claim 11, wherein the one lateral boundary surface (110) of the groove-type constrictions (106) has a spherical pro file, as seen in cross section. / 13. The wiper blade as claimed in claiml 1, wherein the two lateral boundary surfaces (108, 110) of the groove-type constrictions (106) have a spherical profile, as seen in cross section. 14. The wiper blade as claimed in claim 10 to 13, wherein the wiping lip (101) has a longitudinal channel (118) closed all the way around. 15. The wiper blade as claimed in claim 10 to 14, wherein each spring rail (28, 30) protrudes at least with a central edge strip out of its groove-type constriction (106)

Documents:

in-pct-2002-0172-che abstract granted.pdf

in-pct-2002-0172-che claims granted.pdf

in-pct-2002-0172-che description (complete) granted.pdf

in-pct-2002-0172-che drawings granted.pdf

in-pct-2002-172-che-abstract.pdf

in-pct-2002-172-che-claims .pdf

in-pct-2002-172-che-correspondance others.pdf

in-pct-2002-172-che-correspondance po.pdf

in-pct-2002-172-che-description complete.pdf

in-pct-2002-172-che-drawings.pdf

in-pct-2002-172-che-form 1.pdf

in-pct-2002-172-che-form 18.pdf

in-pct-2002-172-che-form 26.pdf

in-pct-2002-172-che-form 3.pdf

in-pct-2002-172-che-form 5.pdf

in-pct-2002-172-che-pct.pdf