Fire protection door lock having a heat sensitive safety device

Details Fire protection door lock having a heat sensitive safety device Fire protection door lock having a heat sensitive safety device

1994-10-20

1996-06-18

Meyers, Steven N.

Closure fasteners

Bolts

Sliding

292DIG62, 292DIG66, 292 21, 292 34, 292 92, E05C 102

Patent

active

055270743

ABSTRACT:
Disclosed is a door lock for locking a double-swinging type fire protection door. The door lock has a safety device controlled by a melting heat sensitive element to lock the spring bolt of the lock bolt in the locked position when the ambient temperature is sharply increased due to a fire.

REFERENCES:
patent: 4005886 (1977-02-01), Lirette
patent: 4099292 (1978-07-01), McCabe
patent: 4099753 (1978-07-01), Gwozdz et al.
patent: 4145900 (1979-03-01), Ohno
patent: 4445717 (1984-05-01), Imhoff

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