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Windshield wiper with an automatic pressure means

  • US 5,463,790 A
  • Filed: 05/31/1994
  • Issued: 11/07/1995
  • Est. Priority Date: 05/31/1994
  • Status: Expired due to Fees
First Claim
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1. A windshield wiper for wiping a windshield, said wiper comprising:

  • an elongated master wiper arm;

    two auxiliary wiper arms fastened to opposite ends of said master wiper arm, such that each auxiliary wiper arm includes a first presser end, a second presser end and a third presser end;

    a clamp provided at and coupled to each presser end of each auxiliary wiper arm;

    a double-strip rubber blade connected to the clamp at each presser end; and

    two pressure mechanisms mounted at a top portion of said master wiper arm to press the rubber blade against the windshield, wherein each of said pressure mechanisms includes a wing having spaced lateral edges, a pivot pivotally connecting said wing along one edge to said master wiper arm, and a pivot gear fastened to said pivot proximate a mid point of said master wiper arm, wherein each of said pressure mechanisms further includes a prestressing mechanism mounted on said master wiper arm and respectively engaged with said pressure mechanisms to rotatably bias a respective wing about said pivot;

    each of said prestressing mechanisms including a prestress gear meshed with the pivot gear of an associated pressure mechanism, a threaded member fixed to said prestress gear and threadingly engaged with said master wiper arm, an adjusting screw threadingly engaged with said master wiper arm and an elastic element stopped between said threaded member and the adjusting screw;

    said adjusting screw being adjustable for exerting prestress force to the elastic element, such that the force is transmitted to said prestress gear of said prestressing mechanism via said threaded member.

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