Lock with facility for preventing unauthorized entry

Details Lock with facility for preventing unauthorized entry Lock with facility for preventing unauthorized entry

1990-06-08

1992-04-14

Smith, Gary L.

Closure fasteners

Operators with knobs or handles

292DIG66, 292 36, 70DIG10, 70483, 70369, E05B 1502

Patent

active

051041642

ABSTRACT:
The invention provides a lock with a forward and reverse action bolt element and a lock cylinder which precedes the operating region of the bolt element into which the force for shifting the bolt element is to be introduced. The lock comprises an arresting element which can be fused at least locally by the effect of heat on the lock cylinder and which, after fusion, arrests the bolt element against reverse lock actuation.
In an alternative embodiment, the lock may comprise a coupling between the operating region and a lock-actuating element spatially separated from it and protected by the lock cylinder, which coupling can be broken by fusion due to the effect of heat on the lock cylinder.

REFERENCES:
patent: 1269311 (1918-06-01), Rixson
patent: 2942449 (1960-06-01), White
patent: 3111022 (1963-11-01), Maynard
patent: 4015869 (1977-04-01), Horvath
patent: 4065164 (1977-12-01), Bartels
patent: 4183565 (1980-01-01), Allemann
patent: 4437693 (1984-03-01), Godec

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