Device for holding a door firmly closed

Details Device for holding a door firmly closed Device for holding a door firmly closed

1978-12-26

1980-07-01

Husar, C. J.

Closure fasteners

Bolts

Double acting

16 84, 16DIG32, 292201, 292DIG49, 292DIG71, E05C 1902

Patent

active

042103495

ABSTRACT:
A device for holding a door firmly closed includes a bracket for attachment to a door and a bistable assembly for attachment to the door jamb. A spring-biased piston within the bistable assembly presses one arm of a rotatable bell-crank against the tip of the bracket to hold the door firmly closed against the door jamb. Opening the door against the urging of the spring-biased piston rotates the bell crank to a standby position in which it is held stably by the spring-biased piston.
In a preferred embodiment, a solenoid within the housing of the bistable assembly rotates the bell crank from engaged position to standby position in response to an external signal, thereby moving the door away from the door jamb automatically.

REFERENCES:
patent: 2394878 (1946-02-01), Slopa
patent: 2598958 (1952-06-01), Wood
patent: 2601983 (1952-07-01), Schoelkopf
patent: 2606052 (1952-08-01), Soreng et al.
patent: 2833578 (1958-05-01), Burke
patent: 3659886 (1972-05-01), Andrews
patent: 3825215 (1974-07-01), Borglum
patent: 3905626 (1975-09-01), Myers
patent: 4056276 (1977-11-01), Jarvis

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