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Clamp

  • US 3,964,738 A
  • Filed: 08/06/1975
  • Issued: 06/22/1976
  • Est. Priority Date: 05/24/1974
  • Status: Expired due to Term
First Claim
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1. In combination with a clamping device for workpieces or the like having a pair of operatively interconnected jaws and force multiplying means for displacing the jaws relative to each other;

  • the improvement including a work engaging element movably mounted on one of the jaws in confronting relation to the other of the jaws, over-center linkage means mounted on said one of the jaws and engageable with said work engaging element for displacement thereof from a retracted position toward the other of the jaws, operating means mounted on said one of the jaws for actuating the linkage means in response to over-center movement, spring means operatively engageable with the work engaging element for yieldably resisting said over-center movement of the operating means, release means selectively engageable with said one of the jaws for imparting over-center movement to the operating means against the bias of the spring means to return the work engaging element to the retracted position, said force multiplying means including a pair of links, means pivotally connecting each of said links between the jaws, each of said links having arcuate sections of opposite curvature, means pivotally interconnecting said links between the arcuate sections, a pair of nut elements, pin and slot connecting means interconnecting said nut elements with overlapping arcuate sections of said links, and actuating screw means threadedly engageable with said nut elements.

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