Lock assembly for automatically dead bolting a closure

Details Lock assembly for automatically dead bolting a closure Lock assembly for automatically dead bolting a closure

1975-10-28

1977-03-15

Britts, Ramon S.

Closure fasteners

Keepers

With silencing or anti-rattle means

49 7, 292 38, 292DIG66, E05B 1502

Patent

active

040120660

ABSTRACT:
A lock assembly for automatically dead bolting a closure to a closure frame when the ambient temperature is raised above a predetermined temperature by fire comprises a striker plate, which defines a bolt hole, mounted on the closure frame. A cooperating latching mechanism, installed in the closure, includes a housing and a bolt assembly mounted in housing for reciprocal movement to and from a latched position projecting into the striker plate bolt hole and for movement to an extreme dead bolted position projecting further into the bolt hole beyond the latched position. A stop pin mechanism associated with the bolt assembly prevents the bolt assembly from being moved out of the dead bolted position once this position is assumed and a spring urges the bolt toward the dead bolted position. The bolt assembly is reciprocated to and from its latched position and is ultimately moved to its dead bolted position by a bolt actuator mechanism which includes a crank, and a cable interconnecting the crank and the bolt assembly. A roller, which is disintegratable at the predetermined temperature, guides the cable through a first nonlinear path of active length sufficient only to permit the bolt assembly to assume its latched position. However, when the roller disintegrates at the predetermined temperature in a fire, the cable traverses a second path of active length sufficient to permit the bolt assembly to assume its dead bolted position.

REFERENCES:
patent: 144288 (1873-11-01), Rand
patent: 809628 (1906-01-01), Pretsman
patent: 2238266 (1941-04-01), Johnson
patent: 2389315 (1945-11-01), Kerr
patent: 2812835 (1957-11-01), Smiley
patent: 3811717 (1974-05-01), Floyd

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