Door latch assembly with backset adjustment

Details Door latch assembly with backset adjustment Door latch assembly with backset adjustment

1994-11-14

1996-10-08

Kannan, Philip C.

Closure fasteners

Adjustable backset

137165, 137337, E05C 116

Patent

active

055623140

ABSTRACT:
A latch assembly for mounting in a bore extending in from a side edge of a door has a backset adjustment for different distances between rotational axis of a handle or keylock and the side edge of the door. The bolt has a concentric aperture into which a bolt adjuster slidably mates with a close tolerance to prevent lateral movement between the bolt and the bolt adjuster. The latch assembly comprises a casing assembly having a bolt assembly longitudinally reciprocal therein between a retracted position and an extended position, the bolt assembly including a bolt with a cylindrical aperture therein, the bolt rotatable and reciprocal relative to a non-rotational cylindrical bolt adjuster and having a sliding fit thereon. A helical groove in one of the bolt or the bolt adjuster engages with a projection of the other of the bolt or bolt adjuster. The casing assembly is in two parts with a non-rotational rear casing integral with a hollow cylindrical portion with a non-helical serpentine shaped slot, and a forward hollow cylindrical casing rotatable and slidable about the front portion of the rear casing, with the forward casing having an internal protrusion to engage in the non-helical serpentine shaped slot. Thus the forward casing and bolt can be rotated together but through significantly different patterns of movement to change the backset with the bolt moving longitudinally ahead of the forward casing midway through simultaneous rotation of both.

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