Latchbolt rim lock

Details Latchbolt rim lock Latchbolt rim lock

1978-11-30

1981-10-13

Lyddane, William E.

Locks

Special application

For closures

70151A, 70448, 70462, 70DIG6, 29216918, E05B 5500

Patent

active

042940893

ABSTRACT:
A latchbolt rim lock of simple sturdy construction with smooth effective operation and long life. A die cast case forms guides for a bolt having a head and draw plate, and has U-shaped ribs on its rear wall to define seats for springs biasing the bolt forward, in which the springs are held by a rear flange on the back plate. A rearward boss on the front wall forms a retraction stop for the bolt and contains a headed holdback plunger which is manually movable into a hole in the bolt where it is latched by its head to hold the bolt retracted. The draw plate contains a cam opening which defines opposite cam faces which are engaged by a crank pin to retract the bolt. The cam opening also has a central pin-passing throat which allows cammed retraction of the latchbolt relative to the crank pin, and defines supplemental cam faces for moving the bolt to release the holdback plunger. For deadlocking the latchbolt, an auxiliary bolt is mounted beside the latchbolt and biased to projected position by a spring mounted on the case. The bolt is connected to be retracted with the latch bolt, but to be held retracted by a strike while the latchbolt is projected. A bell crank lever pivoted on a post of the case has a blocker arm movable into and out of the path of the bolt head, respectively to block and permit its retraction, and has a control arm by which the lever is swung to retraction-permitting position when the auxiliary bolt is projected. When the auxiliary bolt is retracted, the control arm swings against the crank pin so as to be cammed to retraction-permitting position when the crank pin is manually actuated to retract the bolt. To permit changing the hand of the lock, the bolt is made symmetrical except for the bevel on its head so that it can be turned over in the case, and the auxiliary bolt head is mounted for rotation on a draw bar to reverse the position of its bevel face.

REFERENCES:
patent: 168986 (1875-10-01), Griscom
patent: 227301 (1880-05-01), Reinhart
patent: 2136539 (1938-11-01), Brinton
patent: 2279591 (1942-04-01), Heyer
patent: 2379810 (1945-07-01), Ledin et al.
patent: 2656207 (1953-10-01), Russell et al.
patent: 2787155 (1957-04-01), O'Connell
patent: 3211486 (1965-10-01), Crandell
patent: 3337250 (1967-08-01), Russell et al.
patent: 3361464 (1968-01-01), Foster
patent: 3971239 (1976-07-01), Lavis

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