Engaging/disengaging fail-safe door closing device for...

Details Engaging/disengaging fail-safe door closing device for... Engaging/disengaging fail-safe door closing device for...

2007-10-02

2007-10-02

Lorence, Richard M (Department: 3681)

192 clutches and power-stop control

Transmission and brake

Electromagetic

C188S164000, C160S009000

Reexamination Certificate

active

11012545

ABSTRACT:
There is disclosed an engaging/disengaging fail-safe door closing device for a rolling fire door, provided between a power device and a speed reducing device of a door machine, including an electromagnet fixed inside a housing of the door machine and disposed around the outside of a shaft of the power device; a brake device including a shaft sleeve, loosely embracing around the outside of the shaft of the power device and being capable of sliding between the shaft and the electromagnet, on one end of which, there is provided an attracted plate facing the magnet and coming off the magnet by way of the biasing force of an elastic element, while on the other end there is radially formed a brake disk; a driving plate fixed on the shaft of the power device and facing a position where the brake disk is allowed to contact; and a circuit used to control the electromagnet to be electrified to excite in order for actuating the brake when the door reaches a predetermined position, or to release the brake when the power is cut off.

REFERENCES:
patent: 5245879 (1993-09-01), McKeon
patent: 5850865 (1998-12-01), Hsieh
patent: 6092582 (2000-07-01), Liu
patent: 6155324 (2000-12-01), Elliott et al.
patent: 2004/0113574 (2004-06-01), Hsieh
patent: 2005/0172559 (2005-08-01), Hsieh
patent: 2827164 (1980-01-01), None

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