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Deadbolt backset latch with interlock

  • US 4,979,768 A
  • Filed: 08/28/1989
  • Issued: 12/25/1990
  • Est. Priority Date: 08/28/1989
  • Status: Expired due to Fees
First Claim
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1. A backset latch mechanism adjustable before installation having a housing, including a cylindrical housing and a casing housing movable in the cylindrical housing, a swivel mounted in the casing housing, a housing back plate attached to the cylindrical housing and a face plate adjacent to the back plate and a bolt train including a deadbolt reciprocal within the casing housing for movement by the swivel, the improvement for accomplishing backset adjustment prior to installation comprisinga. an internal recess in the deadbolt;

  • b. an adjustment plug reciprocally mounted within the deadbolt recess;

    c. locking means locking the plug to the deadbolt in at least two positions;

    d. turnable shuttle means positioned between the deadbolt and the cylindrical housing to prevent axial movement of such shuttle means relative to the cylindrical housing at all times and to selectively engage the deadbolt during backset adjustment to prevent deadbolt axial movement and also causing the locking means to release and unlock the adjustment plug from the deadbolt to accomplish backset adjustment.

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