Time delay release mechanism for a fire barrier
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United States of America Patent
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Apr 13, 1999
Issued Date -
N/A
app pub date -
Sep 30, 1997
filing date -
Sep 29, 1995
priority date (Note) -
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status (Latency Note)
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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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