Abstract:
A windshield wiper adjustment assembly for eliminating chatter and squeak and effecting smooth travel of a windshield wiper as it is drawn across a windshield. The adjustment assembly allows the angular displacement of the wiper retainer to be selectively varied.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates in general to windshield wipers and in particular to a windshield wiper adjustment assembly. 
     The type of windshield wiper in use today does not allow a great deal of relative motion between the drive arm and the wiper retainer. Thus, for the most part, the wiper retainer maintains the same position with respect to the windshield as the wiper is drawn across the windshield. The seal between the wiper blade and the windshield is due to the flexibility of the wiper blade; a portion of the side of the blade is pressed to the windshield. As the wiper blade becomes worn, a greater portion of the side of the blade is pressed to the windshield and the blade increasingly fatigues. As the blade becomes more fatigued, the glade material becomes more flexible. When the direction of the windshield wiper is reversed, a greater portion of the blade must also reverse its direction. Thus, the blade moves in the opposite direction without alternating the side of the blade lying upon the windshield. The chances of chatter and squeak occurring are increased as the blade becomes worn. 
     Accordingly, this invention has the following objects: 
     To eliminate chatter and squeak and effect smooth travel of the windshield wiper; 
     To allow the angular displacement to the wiper retainer to be selectively adjusted; 
     To reduce the wear and fatigue of the wiper blade; and 
     To increase the effectiveness of the windshield wiper in maintaining good visibility herein. 
    
    
     These and further objects will become more apparent upon consideration of the accompanying drawings in which: 
     FIG. 1 is a top elevational view of the windshield wiper assembly with the adjustment assembly included; 
     FIG. 2 is a front elevational view of the windshield wiper assembly with the adjustment assembly included; 
     FIG. 3 is a side cross-sectional view of the windshield wiper assembly with the adjustment assembly; 
     FIG. 4 is a side elevational view of the windshield wiper and adjustment assemblies when the windshield wiper is drawn across the windshield; 
     FIG. 5 is a side elevational view of the windshield wiper and adjustment assemblies as the windshield wiper is drawn across the windshield in the opposite direction of FIG. 4; 
     FIG. 6 is a side view of the adjustment assembly extending angularly; 
     FIG. 7 is a side view of the adjustment assembly extending angularly; 
     FIG. 8 is a side view of the adjustment assembly extending horizontally. 
     FIG. 9 is a partial side sectional view of a second embodiment of the windshield wiper adjustment assembly; 
     FIG. 10 is a partial top view of the adjustment assembly having flexible flaps and wings; and 
     FIG. 11 is a partial side view of the wiper asssembly of FIG. 10. 
    
    
     Consistent with the foregoing objects, Applicant herein provides a windshield wiper adjustment assembly 10 pivotally connected to drive arm 11 and to wiper retainer 13. Adjustment assembly 10 has two flaps 15, each of which has a projection 16 extending from the flap toward the upper surface of wiper retainer 13 such that projection 16 contacts upper surface 18 limiting the maximum angular displacement of the wiper retainer with respect to the drive arm while the wiper is drawn across the windshield. 
     DETAILED DESCRIPTION 
     While this invention is susceptible of embodiment in many different forms, there are shown in the drawings and will herein be described in detail, several specific embodiments, with the understanding that the present disclosure is to be considered an exemplification of the principles of the invention and is not intended to limit the invention to the embodiments illustrated. 
     The windshield wiper and adjustment assemblies are shown in FIG. 1 of the drawings, with adjustment assembly 10 pivotally connected to drive arm 11 at pivot point 12. Adjustment assembly 10 is in turn pivotally connected to wiper retainer 13 at pivot point 14. Flap 15 is shown with two threaded fasteners 16 as part of adjustment assembly 10. 
     FIG. 2 shows adjustment assembly 10, drive arm 11, wiper retainer 13, and wiper 17. In this embodiment, adjustment assembly 10 is shown connected to drive arm 11 at pivot 12. Adjustment assembly 10 is shown consisting of flap 15, threaded fasteners 16, and limiting arm 18 which, in this embodiment, is the upper surface of wiper retainer 13. Wiper 17 is held by wiper retainer 13; wiper retainer 13 is connected to adjustment assembly 10 at pivot 19. 
     In FIG. 3, drive arm 11 is shown connected to adjustment assembly 10 by pivot 12. Adjustment assembly 10 is shown connected to wiper retainer 13 by pivot 14. Two threaded fasteners 16 are shown extending through flap 15. 
     In FIG. 4 of the drawings, windshield wiper 17 is shown drawn across windshield 20 pivoting windshield wiper 17 and wiper retainer 13 about pivot connection 14 until threaded fastener 16 contacts limiting arm 18. Angle α is shown as the angle at which wiper retainer 13 is maintained with respect 20 to drive arm 11 while wiper 17 is drawn across windshield 20 in one direction. Angle α can be selectively adjusted by lowering or raising one of threaded fasteners 16 in flap 15. 
     FIG. 5 shows wiper retainer 13 at Angle β with respect to drive arm 11 as windshield wiper 17 is drawn across windshield 20 in the direction opposite to that shown in FIG. 4. Angle β need not be the same as Angle α as threaded fasteners 16 may be individually positioned. 
     FIG. 6 shows flaps 15 extending angularly outward from wiper retainer 13. Each flap 15 has a threaded fastener 16 extending therethrough and when wiper retainer 13 is pivoted, threaded fasteners 16 will contact limiting arms 18 which extend angularly from drive arm 11. In FIG. 7, flaps 15 are shown extending angularly from drive arm 11 and limiting arms 18 extend angularly from wiper retainer 13. 
     In the embodiment shown in FIG. 8, both limiting arms 18 extending from drive arm 11 and flaps 15 extending from wiper retainer 13 are horizontal. 
     FIG. 9 shows another embodiment of the windshield wiper in which drive arm 11 is parallel to and above wiper retainer 13. This embodiment could exist on cars having windshield wipers that do not disappear below the hood edge. Adjustment assembly 10 is pivotally connected to drive arm 11 at pivot 12 and is in turn pivotally connected to wiper retainer 13 at pivot 14. Adjustment assembly 10 has flexible flaps 21 extending outward from the upper portion of adjustment assembly 10 and 22 extending outward from wiper retainer 13. Flexible flaps 21 and flexible arms 22 can be bendably positioned so as to limit the maximum angular displacement of wiper retainer 13 with respect to drive arm 12. Additionally, flexible flaps 21 or flexible arms 22 can be used in conjunction with limiting arm 18 as shown in FIGS. 5 through 8 to limit the maximum angular displacement. Thus, for instance, flexible flaps 21 may extend from wiper retainer 13 and limiting arms 18 may extend from drive arm 11 or flexible flaps 21 may extend from drive arm 11 and limiting arms from wiper retainer 13. Also, it is possible for flexible flaps 21 an arms 22, limiting arms 18, and flaps 15 with projections 16 to be used in many combinations together. 
     FIGS. 10 and 11 show adjustment assembly 10 with drive arm 11 mounted parallel to and above wiper 17. Adjustment assembly 10 is attached to drive arm 11 at pivot 12, and to wiper retainer 13 at pivots 19, in an arrangement intended for wipers which do not travel below the hood edge. 
     While the principles of the invention have been described above in connection with specific apparatus and applications, it is to be understood that this description is made by way of example only and not as a limitation on the scope of the invention.