Apparatus for closing fireproof doors

Details Apparatus for closing fireproof doors Apparatus for closing fireproof doors

1986-08-01

1987-12-29

Aschenbrenner, Peter A.

Movable or removable closures

Thermal releaser or actuator

16 485, 49 2, E05F 1520

Patent

active

047151463

ABSTRACT:
An apparatus is disclosed for releasably locking a fireproof door in an open position. A latch mechanism includes a hook connected to the door. The hook is releasably engaged with an actuator plate swingable between a latching position and a release position. Its motion is restricted by resilient means having bias adjustment means. A toggle mechanism keeps the actuator plate in its latching position until the toggle mechanism is struck by a remote-controlled solenoid plunger to release the door and let it close. If the solenoid malfunctions, the door can be closed manually with a force dependent on the setting of the bias adjustment means.

REFERENCES:
patent: 2171365 (1939-08-01), Harding
patent: 2352843 (1944-07-01), Lewis
patent: 2665129 (1954-01-01), Durbin et al.
patent: 3729770 (1973-05-01), Lasier
patent: 3771823 (1973-11-01), Schnarr
patent: 3964125 (1976-06-01), Tansley
patent: 4040143 (1977-08-01), Lasier

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