Importance

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Abstract

A wiping radius of a wiper arm having a wiper blade connected to its top end is changed by a four-link linkage so that the wiper blade can clean a far corner of a windshield. The four-link linkage is constituted by two links pivotally connected to the wiper arm and to both axes fixed to a stationary frame, the wiper arm, and a stationary link formed between both axes. The wiper arm with the four-link linkage is driven by a drive mechanism including a motor and swings between upper and bottom positions. A passive biasing member is connected to the four-link linkage, so that the upward movement of the wiper arm from the bottom position is assisted and the downward movement toward the bottom position is resisted by the biasing member, thereby making driving load imposed on the motor substantially equal in both movements.

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First Claim