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Fire damper

  • US 4,084,744 A
  • Filed: 05/05/1976
  • Issued: 04/18/1978
  • Est. Priority Date: 05/05/1976
  • Status: Expired due to Term
First Claim
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1. A fire damper comprising a housing having a first side open to receive gases from a first area, a second side normally open to permit said gases to flow to a second area, and a third side normally closed;

  • a door pivotally connected to said housing in a first position so as normally to effect the closing of said third side while said first and said second sides are open, said door being swingable by gravity to a second position in which said normally open second side is closed by said door and in which said normally closed third side is open so as to permit said gases to flow from said housing through said third side only;

    releasable latch means to normally maintain said door in said first position; and

    heat sensitive means to actuate said releasable latch means in response to temperature changes in said first area whereby to permit said door to swing from said first position to said second position, said heat sensitive means including pneumatic means to actuate said latch means, and a heat sensor in the region of said first area, said heat sensor being electrically connected to said pneumatic means, whereby said releasable latch means are actuated in response to a temperature increase in said first area.

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