Variable pressure wiper arm for vehicle windscreen - has drive linkage forming swivel lever for elongation member which is outside movement path of movable components

摘要

The drive linkage (4) of the arm also forms the swivelling lever for the connection of an elongation member (19). The linkage point (21) of the elongation member is situated between the bearing axis (7) of the drive member and the connection axis (10) with the coupling (6). In each working position of the wiper blade the elongation member lies outside the movement path of the movable parts (4,6,13) of the wiper arm. The coupling member connects the driving and driven linkages (4,5). ADVANTAGE - Has lower production costs and higher wear resistance without losing the ability to vary the force of the blade against the screen, depending on the angle of the blade.