Flexible or portable closure – partition – or panel – Automatic control – With starting or driving means
Reexamination Certificate
2004-11-29
2008-11-11
Johnson, Blair M. (Department: 3634)
Flexible or portable closure, partition, or panel
Automatic control
With starting or driving means
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
Bucknam & Archer
Johnson Blair M.
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