| 摘要 |
PURPOSE: A four-joint wiper arm for a vehicle is provided to improve durability and lengthen the life span by fixing an arm head on a connecting line using a plastic bush. CONSTITUTION: A four-joint wiper arm comprises a first arm head(20), a second arm head, a connecting link(10) movably combined to the first and the second arm heads by a first hinge pin(22) and a second hinge pin, a retainer combined to the connecting link and a wiper blade via an arm piece, and an arm spring keeping the wiper blade stuck on the surface of a windshield. A plastic bush(40) including a cap(44) for preventing the invasion of foreign materials and a spring(56) for pressurizing a washer(54) is inserted to the combined portion of the first and the second arm heads and the connecting link. According to the plastic bush, the wiper arm is operated smoothly while friction is minimized. Therefore, the durability of the wiper arm is improved.
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