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Latch helical backset adjustment

  • US 4,664,433 A
  • Filed: 05/12/1986
  • Issued: 05/12/1987
  • Est. Priority Date: 05/12/1986
  • Status: Expired due to Term
First Claim
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1. In a latch construction for mounting in doors and the like of a type having a bolt longitudinally reciprocal in a normally stationary casing between a forward extended position projecting from the casing and a rearward retracted position substantially fully within the casing, latch operating means forwardly operably connected to said bolt and rearwardly operably connected to an operator thereof, said operating means operator being movable about a transverse axis actuating said actuating means to reciprocate said bolt, longitudinal distance between forward extremity of said casing and said operator axis constituting backset;

  • the improvements including;

    said bolt and said casing each being comprised of relatively longitudinally movable forward and rearward parts;

    a substantially helical slot on one of said parts engaged by a projection on the other of said parts of each of said bolt and casing, said slot and projection providing helical longitudinal movement for each of a determined same amount between a forward backset and a rearward backset;

    interconnection means between certain of said bolt parts and certain of said casing parts for requiring substantially the same helical longitudinal movement of one upon such movement of the other;

    said bolt being reciprocal relative to said casing in either of said forward and rearward backsets.

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