Fire responsive safety door assembly

Closure fasteners – Bolts – Emergency operating means

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Details

292279, 292DIG66, E05B 6510, E05C 336

Patent

active

048241504

ABSTRACT:
A door retention assembly locks a door in closed position in response to high temperature as during a fire, the door element having an edge portion closable into adjacent relation to an edge portion defined by a header element, and there being a strike carried by one of the elements. The assembly includes:

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patent: 4709950 (1987-12-01), Zortman
patent: 4726613 (1988-02-01), Foshee

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