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| Number | Title | Issue Date |
| 8100163 | Apparatus and method for controlling barrier movement An apparatus for controlling the movement of a barrier is provided. The apparatus includes a governor with a preload member. The preload member provides a preload force that releasably and magnetically couples the preload member to the governor. The preload member i... | 01/24/2012 |
| 7762304 | Device for detecting an obstacle and limiting the force of an apron in a goods-handling door The invention relates to a device for detecting an obstacle and limiting the force from the primary edge or sill nosing (10) of a flexible apron or curtain (5) in a goods-handling door (1) when the latter comes into contact with an obstacle (... | 07/27/2010 |
| 7254868 | winding and anti-drop assembly for door counterbalance system A counterbalance system (25) for a door (D) movable between a closed position and an open position having an axle (20), a cable drum (15) attached to the axle, a winding shaft (35) interconnected with the axle by a counterbalance spring (... | 08/14/2007 |
| 7246648 | Friction device for rolling up curtains and the like A friction device for rolling up curtains and the like includes a tubular roller (1), on which a curtain (1a) is wound. The roller (1) is rotatably carried by a support (10) and a threaded stem (2) is situated axially inside... | 07/24/2007 |
| 7174941 | One-way drive for window coverings An actuation system for use with an adjustable covering for a fenestration product. The actuation system coupled to an operator for controlling adjustment of extension and contraction of the covering. The actuation system including at least one lift mechanism config... | 02/13/2007 |
| 7144051 | Method and apparatus for providing for fail safe condition for an automatic security gate A method and apparatus for locking a security gate operating shaft contained in a security gate operating mechanism having a housing from which extends the operating shaft, which may comprise: a locking collar, having at least one engageable protrusion extending rad... | 12/05/2006 |
| 7086441 | Hydraulic governor device for use with a rotational shaft, and door assembly including the same A hydraulic governor device for use with a rotational shaft of a door assembly for controlling a rotation of said rotational shaft. The device includes a sleeve; first and second end coverings mounted respectively onto first and second ends of the sleeve so as to de... | 08/08/2006 |
| 6550597 | Emergency brake mechanism In an emergency brake mechanism of the present invention, a rotation input shaft is increased in rotation speed by a planetary set-up gear to centrifuge weights. Through the action of the centrifugal force of the weights, linings of the brake shoes are br... | 04/22/2003 |
| 6223802 | Control system for coverings for architectural openings A control system for a vertically moveable covering for an architectural opening includes a uni-directional drive assembly that is operated with a single pull element such that upon pulling of the pull element, the covering can be raised in increments. A ... | 05/01/2001 |
| 6129131 | Control system for coverings for architectural openings A control system for a vertically moveable covering for an architectural opening includes a uni-directional drive assembly that is operated with a single pull element such that upon pulling of the pull element, the covering can be raised in increments. A ... | 10/10/2000 |
| 6123134 | Method and apparatus for regulating the closing speed of a rolling fire door A mechanism for regulating the closing speed of a rolling fire door during an emergency condition. The speed regulating mechanism includes a viscous speed governor which is operatively connected to the support shaft of the fire door for providing a speed ... | 09/26/2000 |
| 6082433 | Control system and method for roll-up door A flexible curtain rollup door is driven between open and closed positions by an adjustable frequency AC electric drive motor including a controller which is operable to accelerate and decelerate the motor by supplying AC electrical power at variable freq... | 07/04/2000 |
| 6059008 | Braking device for shutter for building A device for preventing a shutter curtain from falling by its own weight and allowing the shutter curtain to descend in a braked manner, is provided such that separate space for the device does not need to be provided. A viscous clutch 9, which provides b... | 05/09/2000 |
| 5832665 | Sensing edge A sensing edge is provided for causing a door to open by actuating a device upon force being applied to the sensing edge. The sensing edge includes an elongate outer sheath with a first strip of resiliently compressible material affixed to one of the inne... | 11/10/1998 |
| 5803150 | Device for operating a closure element moving at least approximately vertically The operating device comprises a drive shaft (1) driven by a geared motor unit (4) via a transmission mechanism allowing the closure element being lowered to be disengaged when a resistive force opposes the lowering thereof. The device has no brake. By co... | 09/08/1998 |
| 5743320 | Obstruction-responsive brake actuator for fire door or the like 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 betwee... | 04/28/1998 |
| 5706875 | Mechanism for detecting an obstacle preventing the proper operation of a roller-type door with sectional shutters A mechanism for detecting an obstacle preventing the proper operation of a sectional shutter of a warehouse-type door which includes a detection member mounted in the vicinity of a horizontal shaft around which the sectional shutter is wound by the operat... | 01/13/1998 |
| 5642767 | Up closing fire door A fire door system is disclosed wherein the fire door is up closing in that it includes an up closing partition. Further, the fire door is fail-safe in that in the absence of continuous controls indicating that the fire door should remain open, counterwei... | 07/01/1997 |
| 5634507 | Driving device for vertically movable shutters The invention relates to a driving device for a roller shutter 1. For driving the roller shutter 1 into the open position there is provided a motor 8 with a drive 7 and a chain drive 5 which acts on the bearing shaft 3 of the roller 2 winding up the rolle... | 06/03/1997 |
| 5355927 | Self-closing fire door The present invention is provided with a mechanism for controlling the opening and closing of a door comprising a speed reduction means for reducing a rotational speed. A high speed shaft is connected to the speed reduction means and is connectable to a m... | 10/18/1994 |
| 5022452 | Rolling fire door A rolling fire door consists of a plurality of interconnected fireproof slats forming a curtain which is received by a pair of tracks along the sides of an opening to be secured. A torsion spring assembly assists in the raising and lowering of the curtain... | 06/11/1991 |
| 4794973 | Door safety bar A safety braking device for a roll up or sliding door having a door curtain guided for movement by guide channels engaging its edges, the safety braking device comprising a tilt bar hingedly attached to the leading edge of the door curtain, and brake mean... | 01/03/1989 |
| 4727919 | Safety and emergency actuator device for a concertina type door A counterweight (12) provided at the end of a shaft (8) for winding up the door-raising belts (3) of a concertina type door. The counterweight (12) is designed to open the door to a fraction of its height. It co-operates with the motor (7) when the door i... | 03/01/1988 |
| 4664170 | Rolling firedoor A rolling firedoor having a closure drum on which a closure is wound, and a chaindrive for rotating the drum to raise or lower the closure. The chaindrive is disconnected from the drum during a fire. Means are provided for reconnecting the chaindrive to t... | 05/12/1987 |
| 4404768 | Arrangement for releasing a fire curtain in a theater An improved arrangement for releasing a theatrical fire curtain is described having a mechanical coupling including a gear means which is automatically disengaged upon the occurrence of combustion to enable a fire curtain to descend and cover a proscenium... | 09/20/1983 |
| 4147197 | Fire door and operator therefor There is provided a roll-type door having horizontally positioned slats which is normally held by operator means in an open position against gravity. Said operator means includes fusible means responding to a predetermined heat level for releasing said do... | 04/03/1979 |
