Patent ID: 6105199
Filing Date: 2000-08-22
Classification: B60S

Abstract:
A windshield wiper comprising:an elongate wiper arm having a top end and bottom end;a wiper blade, connected to the top end of the wiper arm for wiping a windshield;a four-link linkage defined by said bottom end of wiper arm, link members, pivotally connected to said bottom end of the wiper arm and a stationary frame, said linkage for changing a wiping radius of the wiper arm;a drive mechanism, connected to the four-link linkage, for giving the wiper arm a wiping motion, a direction of which is switched to a downward motion at an upper position of the wiper arm and to an upward motion at a bottom position of the wiper arm; anda passive resilient biasing member disposed between and coupled to at least one of the link members and an axis supporting that link member, exerting a twisting force on that link member by a resilient force of the biasing member to reduce a maximum driving load imposed on the drive mechanism.