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Door closer

  • US 3,284,841 A
  • Filed: 06/10/1964
  • Issued: 11/15/1966
  • Est. Priority Date: 06/10/1964
  • Status: Expired due to Term
First Claim
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1. IN A HYDRAULIC FLUID DAMPED DOOR CLOSER DEVICE OF THE TYPE WHEREIN A PISTON HAVING A PISTON ROD RECIPROCATES WITHIN THE BORE OF A CYLINDER, WITH THE HYDRAULIC FLUID CONTACTING SAID ROD, MEANS FOR ADJUSTING THE CLOSING SPEED OF THE DOOR AND FOR HOLDING THE DOOR AT A SELECTED OPEN POSITION, COMPRISING (A) A CENTRAL APERTURED END CAP MEMBER THROUGH WHICH SAID ROD SLIDABLY EXTENDS, SAID DEVICE HAVING YIELDABLE SEALING MEANS ADJACENT SAID END CAP MEMBER SLIDABLY ENGAGING SAID ROD FOR PREVENTING LEAKAGE OF HYDRAULIC FLUID FROM BETWEEN SAID ROD AND SEALING MEANS, SAID APERTURE OF SAID END CAP MEMBER BEING OF A GENERALLY FRUSTO-CONICAL SHAPE, WITH THE APEX OF SAID APERTURE DIRECTED TOWARD SAID PISTON, SAID END CAP MEMBER INCLUDING A THREADED PORTION,

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