Pressure-free fail-safe emergency door closer

Details Pressure-free fail-safe emergency door closer Pressure-free fail-safe emergency door closer

1975-09-19

1977-07-12

Downey, Kenneth

Miscellaneous hardware (e.g., bushing, carpet fastener, caster,

Thermally released check or closer

49 2, 49 31, E05F 1520

Patent

active

040344371

ABSTRACT:
A normally pressure-free, failsafe, emergency door closer for use in hospitals, nursing homes or other locations where handicapped persons are housed, comprising an actuating mechanism triggered by a sensing device such as a smoke detector, a spring-loaded arm with a bumper on one end to engage the door and the other end of the arm rotatably attached to the wall adjacent to and above the door and free to rotate in a horizontal plane. The spring-loaded arm is retained in an open position by a vertical pin engaging the horizontal closer arm. The pin is mechanically linked to the armature of an electromagnet opposed by a coil spring. On signal from the sensing device the electromagnet releases the armature and the coil spring urges the pin upwards releasing the closer arm, the end of which engages the door and closes it.

REFERENCES:
patent: 834681 (1906-10-01), Peters
patent: 2651074 (1953-09-01), Slopa et al.
patent: 3284840 (1966-11-01), Ulman
patent: 3908309 (1972-09-01), Coulter et al.
patent: 3915377 (1975-10-01), Sutton, Jr.
patent: 3934306 (1976-01-01), Farris

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