Safety door central release device

Details Safety door central release device Safety door central release device

2007-11-13

2007-11-13

Glessner, Brian E. (Department: 3676)

Closure fasteners

Bolts

Swinging

C292S092000, C292S093000, C292SDIG065, C049S001000, C049S002000, C049S005000, C160S009000

Reexamination Certificate

active

11451256

ABSTRACT:
This invention relates to a type of safety door central release device which can be used to close the safety door automatically when electric power is disrupted. It comprises a cord that is tied to a mechanism having potential energy on one end, and extended to a far distance on the other end; a pair of crank arms of which one end molded as a grip and gripping the cord, and the other end is connected to a sliding bar, having potential energy which assists the grip in release the cord. When electric power is supplied, the sliding bar will be attracted to an electromagnet. As a result, while electric power is disrupted, the release device can immediately release the cord. Due to release of the cord, a brake for a door operator is released by means of the mechanism such that the safety door slides down and then it is closed.

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patent: 5901992 (1999-05-01), Winkler
patent: 6484784 (2002-11-01), Weik et al.

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