Windshield wiper with an automatic pressure means

摘要

A windshield wiper includes a master wiper arm, a rubber blade operatively connected to the master wiper arm and a pressure mechanism mounted at a top portion of the master wiper arm for pressing the rubber blade against a windshield. The pressure mechanism includes a wing, a pivot fastened to one side of the wing, and a gear fastened to the pivot. A prestressing mechanism is mounted on the master wiper arm and engaged with the pressure mechanism. This prestressing mechanism includes a gear meshed with the gear of the pressure mechanism, a threaded member fixed to said gear of the prestressing mechanism, an adjusting screw and an elastic element between the threaded member and the adjusting screw. The screw encloses the prestressing mechanism and exerts prestress force to the elastic element, such that the force is transmitted to the gear of the prestressing mechanism via the threaded member. The rubber blade is connected to the master wiper arm by two assemblies, wherein each assembly includes an auxiliary wiper arm which provides three end portions at which the rubber blade is connected to the assembly. Clamps are provided at the ends of the auxiliary wiper arms. These clamps clamp onto a blade holder of the rubber blade. Each clamp includes a clamping body for clamping onto the blade holder, and a cylindrical rib is raised from a top of the clamping body.