DRIVE MECHANISM FOR WINDSHIELD WIPERS

摘要

In a preferred form, this disclosure relates to a windshield wiper apparatus having a pair of windshield wipers which are adapted to be oscillated across a windshield between inboard and outboard positions during running operation and which are adapted to be moved to a depressed park position when wiper operation is being terminated. The windshield wiper apparatus includes a pair of oscillatable drive pivots to which the wipers are drivingly connected, a drive mechanism having a rotatable output shaft and a crank arm connected to the output shaft and a drive transmission or linkage operatively connected with the crank arm and the drive pivot for oscillating the same to oscillate the wipers. The drive mechanism is operable to rotate the crank arm through a first orbit of the given radius during running operation and is operable to eccentrically move the crank arm to increase the throw thereof to effect movement of the wipers from their inboard position toward their park position when wiper operation is being terminated. The crank arm is a generally U-shaped member having one leg connected to the output shaft and its other leg to the drive linkage and the legs are longitudinally movable relative to each other upon the wiper encountering an obstruction when being moved from their inboard position toward their park position.