Patent GB-789873-A (GB)
Title: Improvements in or relating to windshield wipers
IPC: B60S1/38
Filed: 1954-10-12
Abstract: 789,873. Windscreen cleaners. PRODUCTIVE INVENTIONS, Inc. Oct. 12, 1954 [June 1, 1954], No. 29357/54. Class 138(1). A windshield wiper assembly includes a wiper blade assembly 1, 2, Fig. 2, and a pressure distributing assembly 18, 19, 20 for applying depressure of a wiper arm to the assembly 1, 2, the pressure distributing assembly comprising a pair of secondary yokes 18, 19 and a primary yoke 20 each secondary yoke being provided with a pair of slots 28, Fig. 7, each end of the primary yoke 20 being provided with a pair of inturned corresponding fingers 26 disposed in the slots 28, and resilient means 31 carried by each secondary yoke for detachably holding the fingers 26 in the slots 28. As shown in Fig. 2, the wiper blade assembly comprises a flexible squeegee 2, having a flexible support 1. The channelled primary yoke 20 is provided with a connector 21 for attachment to a wiper arm and the two secondary yokes 18, 19, are slidably connected at their ends by inturned fingers 23, 25, to the support 1. The support 1, Fig. 3, comprises a strip having reduced extremities 3, 4 and provided with a longitudinal slot 8. The longitudinal side portions 10 of the strip maybe pulled apart so as to hinge about end portions 9 in order that the portions 10 may engage in side grooves 11 in the squeegee 2. Apertures shown in the portions 10 are provided to receive a tool to assist in spreading the portions apart. Shoulders 6, 7 between the reduced extremities 3, 4 and the central portion 5 of the strip serve as stops for limiting the inward movements of the inner ends of the secondary yokes along the extremities 3, 4. Referring to Figs. 5, 6 and 7 each secondary yoke is provided with a pair of openings 27 to receive the inturned fingers 26 on the corresponding end of the primary yoke 20. The openings 27 lead into the slots 28. The resilient means is a T-shaped spring 31 secured to the inside base wall of the secondary yoke, by a rivet 32, and has a pair of arms 34 which extend across the openings 27 and are normally aligned with the slots 28. When the fingers 26 of the yoke 20 are inserted in the portions 29 of the openings 27 and pressed downwardly, the arms 34 are flexed towards the bases 30 of the openings, whereafter the fingers may be slid into the slots 28. Immediately the fingers are engaged in the slots the arms 34 snap back into their normal positions and lock the fingers in the slots. To facilitate removal of the fingers 26 from the slots 28 and openings 27, a pin or nail may be inserted into an aperture 37 in the base wall of the secondary yoke to engage and depress an arm 35 of the spring 31. The side walls of the yokes 18, 19 straddle the sides of the extremities 3, 4 of the support and substantially prevent entry of foreign matter between the yokes and the support. Moreover, shroud-like end walls 24 of the secondary yokes conceal the ends 91 of the support 1. The arcuate base wall 22 of the inner end of each secondary yoke engages the rear edge 13 of the squeegee and the base wall of each secondary yoke also engages the edge 13 near the outer end of the secondary yoke. Specifications 666,473, 666,474, 750,704 and 789,874 are referred to.