Emergency release latch mechanism for smoke hatch

Details Emergency release latch mechanism for smoke hatch Emergency release latch mechanism for smoke hatch

1998-06-22

1999-07-27

Redman, Jerry

Movable or removable closures

With specified means to effect emergency release to closure

49 7, 49366, E05B 6510

Patent

active

059270128

ABSTRACT:
An emergency release latch mechanism for a hinged cover of a hatchway construction, wherein the cover is heavily spring biased to open position but is normally restrained in closed position by the latch mechanism. The mechanism includes an emergency-actuated release member such as a low-temperature fusible metal link which, through a release mechanism which reduces the tensile load on the link, retains a latching dog in engagement with a shackle pin on the cover but assures positive disengagement therefrom to release the cover to open position in the event of actuation of the emergency-actuated release member. The latch mechanism is typically positioned at the center of the hatch but the release member and emergency-actuated release members are disposed near a wall of the hatch so that the latch mechanism may easily be set or reset by a person at the periphery of the hatch by securing a cable connecting the latch mechanism and release mechanism.

REFERENCES:
patent: 2983343 (1961-05-01), Lyons
patent: 3516197 (1970-06-01), Lyons
patent: 3516198 (1970-06-01), Lyons
patent: 3601437 (1971-08-01), Lyons
patent: 3830016 (1974-08-01), Levine
patent: 4090437 (1978-05-01), Bogaert
patent: 4517765 (1985-05-01), Mucha
patent: 5638645 (1997-06-01), Lipton
Bilco's DSH Series Automatic Fire Vents, Data Sheet, 1994.
How to Reset THERMOLATCH.TM. Control Mechanism with a New Fusible Link, Data Sheet, 1984.

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