Closure fasteners – Bolt casings
Patent
1986-05-12
1987-05-12
Moore, Richard E.
Closure fasteners
Bolt casings
292DIG60, 292173, E05C 116
Patent
active
046644334
ABSTRACT:
The door latch construction is of the usual type wherein a bolt is reciprocal in a casing between extended and projecting positions with latch operating means forwardly operably connected to the bolt for causing such motion. In such latch construction, the longitudinal distance between the forward extremity of the casing and the operator axis constitutes backset. According to the present invention, the casing and bolt are each comprised of relatively longitudinally movable forward and rearward parts with a substantially helical slot on one of the parts and engaged by a projection on the other of the parts in each case. The slot and projection of each provides helical longitudinal movement for each of the determined same amount between a forward backset and a rearward backset, with interconnection means between certain of the bolt parts and certain of the casing parts for requiring substantially the same helical longitudinal movement of one upon such movement of the other. Otherwise, the bolt is reciprocal relative to the casing in either of the forward and rearward backsets. The bolt and casing interconnection means may be common formation permitting longitudinal movement but not permitting relative rotational movement. Furthermore, the casing helical slot may be formed at either end to retard movement over the bolt helical slot, resiliently urged stops may be installed to stop helical slot movement at either end of movement, and anti-adjustment projections may be installed only permitting helical slot movement when the bolt is in extended position.
REFERENCES:
patent: 294560 (1884-03-01), Woodrich et al.
patent: 365152 (1887-06-01), Simson
patent: 1661454 (1926-08-01), Wilson
patent: 1672076 (1924-01-01), Munson
patent: 2586066 (1948-06-01), Larson
patent: 2822202 (1958-02-01), Welch
patent: 2937897 (1958-01-01), Soderberg
patent: 4372594 (1983-02-01), Gater
Deutsch Barry E.
Kwikset Corporation
Moore Richard E.
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