Time delay release mechanism for a fire barrier

Movable or removable closures – Time controlled – Predetermined delay governs start of closure movement

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Details

49 7, 160 7, E05F 1520

Patent

active

058932348

ABSTRACT:
A time delay release mechanism has a brake actuator including an actuation member movable between engaged and released positions. The actuation member, when in the engaged position, operatively engages a fire barrier for preventing closure thereof. The actuation member, when in the released position, is operatively disengaged from the fire barrier such that the release mechanism does not prevent closure thereof. A timer includes a magnet which is powered by voltage applied to a capacitor. The magnet is, in turn, connected to the actuator member. When power is interrupted, the capacitor disengages for a predetermined time period. At the conclusion of the time period the magnet releases the actuator which, in turn, releases the brake and causes the fire barrier to close.

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patent: 5673514 (1997-10-01), McKeon

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