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Time delay release mechanism for a fire barrier

DC
  • US 5,893,234 A
  • Filed: 09/30/1997
  • Issued: 04/13/1999
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
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1. A time delay release mechanism controlled by an electrical power source and connected to a fire barrier biased to close when power to said time delay release mechanism is interrupted for a predetermined time period, said time delay release mechanism comprising:

  • an actuation member movable between an engaged position and a released position, said actuation member being operatively engageable with the fire barrier such that when said actuation member is in said engaged position said actuation member prevents closure of the fire barrier and when said actuation member is in said released position, said actuation member allows closure of the fire barrier;

    magnetic means mechanically connected to said actuation member for maintaining said actuation member in said engaged position when power is supplied to said magnetic means and for moving said actuation member to said released position when power is no longer supplied to said magnetic means; and

    an energy storage timer electrically connected to the electrical power source and to said magnetic means for providing power to said magnetic means such that when one of (a) said timer receives power for a duration less than the predetermined time period, and (b) when power to said timer is interrupted for a duration less than the predetermined time period, said magnetic means maintains said actuation member in said engaged position, and when power to said timer is interrupted for a duration greater than the predetermined time period, said magnetic means causes said actuation member to move to said released position to allow closure of the fire barrier, said magnetic means returning said actuation member to said engaged position when power is restored to said timer, thereby automatically resetting said brake actuation member.

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