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Obstruction-responsive brake actuator for fire door or the like

  • US 5,743,320 A
  • Filed: 06/11/1996
  • Issued: 04/28/1998
  • Est. Priority Date: 12/29/1995
  • Status: Expired due to Term
First Claim
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1. An obstruction-responsive brake actuator for a fire door safety barrier comprising a rollable fire door curtain having a leading edge which, when the curtain is closing, faces the direction of travel such that an object obstructing closure of the curtain is brought in close proximity to the leading edge, the safety barrier further including a brake operatively engageable with the curtain for preventing closure thereof, the brake being biased against operative engagement with the curtain, the curtain being biased to close when it is out of operative engagement with the brake, said obstruction-responsive brake actuator comprising:

  • a support;

    a bumper carried by said support and movable relative thereto in a direction parallel to the direction of travel of said curtain between an operative position and an inoperative position, said bumper having a lower surface which contacts said object obstructing closure of the curtain; and

    a load-carrying linkage carried by said support and including actuating means connected to the brake and moveable into and out of an actuating position relative to said support so that when a force is applied to said bumper sufficient for movement of said bumper to said operative position, the force is transmitted through said linkage to the brake for causing operative engagement of the brake with the curtain, thereby preventing further closure of the curtain.

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