Miscellaneous hardware (e.g. – bushing – carpet fastener – caster – Thermally released check or closer
Patent
1978-08-25
1980-12-09
Feldbaum, Ronald
Miscellaneous hardware (e.g., bushing, carpet fastener, caster,
Thermally released check or closer
16 66, 16 84, E05F 1520
Patent
active
042375789
ABSTRACT:
Means are provided for retaining fire doors in the open position against the action of spring or other automatic door closers, with remote control release which can be actuated if a fire is detected. In use, one part thereof is mounted on the wall and has holding means for engagement with another part which is mounted on the door. The wall mounted part also includes pneumatically operated actuating means for actuating the holding means when a gas pressure differing from atmospheric pressure is applied thereto so that the door is released when such pressure is removed. The pneumatically operated actuating means of a number of such door holders may be connected to a common gas pressure source together with means for releasing the gas pressure on occurrence of a fire.
REFERENCES:
patent: 2190653 (1940-02-01), Dunn
patent: 2813294 (1957-11-01), Civitelli
patent: 3219374 (1965-11-01), Snell
patent: 3394427 (1968-07-01), Vietz
patent: 3553984 (1971-01-01), Grumbach
patent: 3764172 (1973-10-01), Standke
patent: 3852846 (1974-12-01), Slaybaugh
patent: 3875612 (1975-04-01), Poitras
patent: 3934306 (1976-01-01), Farris
patent: 4050114 (1977-09-01), Zunkel
patent: 4127966 (1978-12-01), Schmidt
Dorgard Limited
Feldbaum Ronald
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