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Fail-safe zero-load hinge/pivot

  • US 4,435,100 A
  • Filed: 12/21/1981
  • Issued: 03/06/1984
  • Est. Priority Date: 12/21/1981
  • Status: Expired due to Term
First Claim
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1. A fail-safe hinge for joining linkage members comprising:

  • a primary sleeve inserted through the linkage members having a flange on one end and threads on the opposite end and an axial bore;

    a primary nut threaded on the sleeve that captures and holds the linkage members in juxtaposition;

    a secondary support member axially inserted inside the primary sleeve, and having a diameter with a predetermined clearance therein and having a head on one end and threads on its opposite end; and

    a secondary nut in threaded engagement with said secondary support member, limited travel of said nut limited on said support member to provide axial clearance between said secondary support member and nut and the combined primary sleeve and nut said secondary support member and secondary nut being of such a size that upon failure of the primary sleeve and nut combination said secondary support member and nut maintain the linkage members in juxtaposition and hold the primary sleeve and nut combination in their relative position.

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