Failsafe door closing device of a fire proof rolling door

Flexible or portable closure – partition – or panel – Automatic control – With starting or driving means

Reexamination Certificate

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Details

C160S009000, C160S310000

Reexamination Certificate

active

07448426

ABSTRACT:
A power-off door closing device of fire proof rolling door in which the rolling door slides down to close by its own weight under abnormal power-off condition by brake-releasing action or by brake-applied action of a braking pin actuated by a energized solenoid, through successive movement of the first end of a sliding lever of a solenoid with a bent arm, a clamp member and a brake actuating rod. This device can be easily changed into non-failsafe door closing fire proof type with original configurations wherein the solenoid is reverse located so that the brake-released action caused by an energized solenoid or the brake-applied action under abnormal power-off condition applies. A reserved power supply temporarily energizes the solenoid to maintain a temporary brake-releasing under abnormal power-off condition, to enable the rolling door sliding down to close by its own weight.

REFERENCES:
patent: 5203392 (1993-04-01), Shea
patent: 5245879 (1993-09-01), McKeon
patent: 5386891 (1995-02-01), Shea
patent: 5850865 (1998-12-01), Hsieh
patent: 5893234 (1999-04-01), McKeon
patent: 6014307 (2000-01-01), Crimmins

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