Dual backset latch

Details Dual backset latch Dual backset latch

1987-10-16

1989-05-30

Smith, Gary L.

Closure fasteners

Bolts

Sliding

292337, 292DIG60, E05C 116

Patent

active

048344320

ABSTRACT:
The dead bolt assembly of this invention features a novel cam activating assembly which permits election of one of two door knob spindle backsets which are in standard usage without the need for substituting different operating assemblies or reversing cylinder or thumbturn spindle components. The cam activating assembly features two parallel rotatably mounted cams which operate about two separate and parallel axes which are the centers of the two spindle backset in common industry usage. The two cams accept the door cylinder drive bar in one of the two predetermined backset positions. Each cam is capable of independently operating the latchbolt in either direction of rotation through coupled opposed cam surface which coact with the latch operating plate in conjunction with a coupling idler to convert the rotary motion of the cams to the reciprocating motion required to extend or retract the bolt.

REFERENCES:
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patent: 4427224 (1984-01-01), Bergen
patent: 4489576 (1984-12-01), Mullich et al.
patent: 4593542 (1986-06-01), Rotondi et al.
patent: 4602490 (1986-07-01), Glass et al.
patent: 4615549 (1986-10-01), Couture
patent: 4639025 (1987-01-01), Fann et al.
patent: 4653787 (1987-03-01), Fang
patent: 4656849 (1987-04-01), Rotondi et al.
patent: 4664433 (1987-05-01), Solovieff
patent: 4687239 (1987-08-01), Lin
patent: 4708379 (1987-11-01), Ching
patent: 4711477 (1987-12-01), Fann et al.
patent: 4718706 (1988-01-01), Fang

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