Door holder power supply access member

Details Door holder power supply access member Door holder power supply access member

1990-09-05

1991-09-03

Gall, Lloyd A.

Closure fasteners

Extension link

Swinging catch

49 31, 49379, E05C 1708

Patent

active

050446800

ABSTRACT:
A door hold open device for use with fire doors connected to a door closer unit. The hold open device has a latching means that automatically unlatches if the power supply drops below a predetermined threshold or a person attempts to disconnect the power supply. The device includes an electrical actuating means for unlatching the held open door. The actuating means allows a door to be latched open without constant current being supplied to the actuating means, so battery power is possible. The invention may be used with any door closer unit, does not require special wiring, and may include a self-contained power supply and an integral smoke detector.

REFERENCES:
patent: 1994940 (1935-03-01), Butters
patent: 3153774 (1964-10-01), Mylie
patent: 3771823 (1973-11-01), Schnaar
patent: 4040143 (1977-08-01), Lasier et al.
patent: 4506407 (1985-03-01), Downey

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