Catch mechanism

Details Catch mechanism Catch mechanism

1975-09-30

1977-04-05

Staab, Lawrence J.

Closure fasteners

Keepers

With movable dog, catch or striker

292DIG66, 49 7, E05B 1502

Patent

active

040158691

ABSTRACT:
A catch mechanism for installation in a door frame to cooperate with a door lock on a fire door. The mechanism includes a catch member pivotable between an operative position in which to serve as a door catch and an inoperative position to enable release of the door no matter what the condition of the door lock. The mechanism includes a heat responsive locking device which locks the catch member in its catch position in the event of a fire generating high temperatures. The locking device may comprise a biased locking plunger mounted in a cavity within the catch member and normally held in a retracted position by a heat fusible metal plug but extendible on melting of the plug to engage the catch body and so lock the catch member.

REFERENCES:
patent: 1288532 (1918-12-01), Drummond
patent: 1551687 (1925-09-01), Peelle
patent: 2598067 (1952-05-01), O'Brien
patent: 2767011 (1956-10-01), Buckley
patent: 3094199 (1963-06-01), Wallmann
patent: 3116398 (1963-12-01), Welch
patent: 3325941 (1967-06-01), Prucha
patent: 3390909 (1968-07-01), Nagel
patent: 3705739 (1972-12-01), Adler
patent: 3811717 (1974-05-01), Floyd et al.
patent: 3819215 (1974-06-01), Fuss

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