Obstruction-responsive brake actuator for fire door or the like
First Claim
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.
1 Assignment
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Accused Products
Abstract
A brake actuator for use in conjunction with a door barrier for preventing closure of the door barrier when the actuator comes in contact with an obstruction. The brake actuator includes a bumper mounted on a leading edge of the barrier and movable between an operative position and an inoperative position. A load carrying linkage is provided which is activated when the bumper is moved to the operative position. The linkage is connected to a brake which becomes engaged when the linkage is activated, thus preventing movement of the door barrier to a closed position when the bumper contacts the obstruction.
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Citations
10 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification