Matches 1 - 50 out of 75 1 2 >


Match Document Document Title
6363575 Door actuating system  
A door actuating system for the leaf of a fire door includes a safety fuse that detaches the fixture between the housing of the door actuating system and an arm on the door or the door frame, which...
6250326 Dual temperature fire damper releasing system  
A mechanical dual temperature damper closing mechanism having a primary link that separates when the ambient temperature reaches approximately 74° F., closing the damper. The new mechanism ...
6092334 Door locking device for a door closer having a fire actuated mechanism for unlocking the door locking device  
A door locking device for locking a door in predetermined, opened positions and automatically unlocking the door from the open positions in the event of a fire. The door locking device comprises a...
5864920 Door closer for the non-fire side of a fire-door safety installation  
A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and...
5674027 Exaggerated actuation and bearing-free rotational mobility in smart hinges  
The implementation of smart materials (shape-memory alloys (SMA) or piezoceramics) as integral actuating devices for single degree-of-freedom (DOF) hinges, thereby providing mobility as well as...
5645128 Fire safety grease seal  
The invention is a grease and dirt seal that is interposed in the connection between a flared tube and an adapter for engaging a support frame. The seal is circular with flat planar surfaces and a...
5393263 Access door eliminator for curtain fire dampers  
A mechanism is provided to engage a resettable link in a curtain-type fire damper and release and reset that link so that the blades of the damper can unfold. The mechanism is actuated remotely and...
5222277 Intermittently and reversibly operable hot wax energized hinge  
A powered hinge powered by a hot wax linear actuator, which can provide for bi-directional rotation of the hinge as the consequence of sequential and intermittent energizing and deenergizing...
4967444 Device for damping the closing movement of a dual door spring-loaded or closure and closure control therefor  
A double-winged door spring is biased for closing with a mechanism for damping of the closure movement and includes a closure sequence control, particularly of a fire-resistant door, in which the...
4905344 Heat actuated link  
A resettable heat actuated link having an associated releasable member comprises first and second gripping portions for acting cooperatively to engage the releasable member in a normal position and...
4842106 Rate controllable damping mechanism  
A rate controllable damping mechanism is disclosed. The mechanism includes a chamber disposed within a housing; an element mounted for movement within the chamber; a damping material, preferably a...
4842136 Dust-proof container having improved construction for holding a reticle therein  
A dust-proof container for keeping therein a mask or reticle usable to transfer a pattern onto a semiconductor wafer for the manufacture of integrated circuits, is disclosed. The container includes...
4817912 Bi-metal operator for smoke, fire and air control damper  
A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a bi-metallic element provided with a heating pad...
4805261 Resettable fire link  
A resettable fire link includes a first member (12) that pivotally supports a latch arm (20) thereon with a bi-metallic coil spring (30) interposed between the first member and the free end of the...
4796420 Fusible link construction  
A fusible link has a tubular housing having a recess in one side thereof in communication with a bore at one end of which one end of a thermally sensitive strut is seated. A yoke has at one end...
4763711 Fire damper  
A fire damper having a temperature-sensitive link assembly designed to permit ease of maintenance of the damper. In one embodiment, the link assembly includes a fusible link that extends across and...
4715146 Apparatus for closing fireproof doors  
An apparatus is disclosed for releasably locking a fireproof door in an open position. A latch mechanism includes a hook connected to the door. The hook is releasably engaged with an actuator plate...
4706330 Automatic closing activator  
This invention concerns a traction device such as a door closure made from memory alloy. In the preferred form the traction device comprises an elongated length of memory alloy, heating means...
4656690 Fireproof door closer and holder having a solenoid and a toggle mechanism  
In an apparatus for closing a fireproof door, a holding device comprises a latch mechanism and a slider. The latch mechanism comprises an actuator member swingably supported in a housing which is...
4598494 Apparatus for closing fireproof doors  
In an apparatus for closing a fireproof door in case of emergency, the fireproof door and a release, which is secured to a door frame, are interconnected by a link mechanism comprising first,...
4536916 Door holder-closer having a control signal operated hold-open function and a mechanical override facility  
A door closing apparatus is described which embraces a unit for generating a closing force, a lever attached thereto via a releasable clutch for actuating the door and a controllable blocking...
4506407 Releasable hold-open device for a door closer  
A releasable hold-open device for a spring-impelled, regulated door closer has a door motion follower adapted to be releasably held in a door-open position. An actuator is arranged to retain or...
4487214 Damper blade actuating mechanism  
Damper blade actuator assembly for use in association with a damper having damper frame means adapted to be associated with an air duct system, and defining an air flow opening, and movable damper...
4483043 Automatic door closer  
An automatic door closer has an elongated fluid-filled housing having a closed end and an opposite open end, a plug closing the open end of the housing, a first piston reciprocatably arranged in...
4474167 Latch for a butterfly damper  
An air/smoke/fire damper including a frame and a pair of damper blades pivoted for rotation within the frame between an open and a closed position, and comprising a heat responsive latch including...
4472999 Damper operator for use with air, smoke and fire dampers  
A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a drive rod; a pair of lever arms which are pivotally...
4432609 Radiation protection louver  
An improved radiation protection louver system is described which comprises a movable louver panel hinged to a rotatable shaft through a thermally sensitive closure hinge member comprising a...
4346554 Fusible link construction  
A fusible link having two body members separably coupled to one another and normally prevented from separating by a collapsible strut. One body member has an opening in which the other body member...
4301569 Quadrant operator  
A novel operator for use with a damper is disclosed comprising a plurality of pivotally interconnected damper operator members which are pivotally associated with the damper blade linkage and...
4292707 Frictional retainer for holding a door open  
A door in combination with a retainer which uses a frictionally restricted rotating disc to hold the door open. Closing of the door causes the disc to rotate and release the door.
4287638 Inside/outside link  
A releasable link is mounted on the wall of a duct, plenum, chamber or the like. The link releases in response to a predetermined increase of temperature within the duct. The link is resettable...
4287639 Door closer permitting free-swing and regular-closer modes  
Door closer of the type which holds the door open until an associated electric circuit is opened or closed. Provides means for free swinging of the door when the door closer is "cocked". This is...
4267619 Controlled release door holder  
A controlled release door holder comprises a housing having a portion defining a cylinder for containment of a fluid, a piston received in the cylinder for movement axially thereof and dividing the...
4237578 Releasable retaining means and fire door control system  
Means are provided for retaining fire doors in the open position against the action of spring or other automatic door closers, with remote control release which can be actuated if a fire is...
4219041 Electro-thermal fire protection locking clip  
A novel locking clip is disclosed for use with either fire or smoke dampers, which locking clip normally does not interfere with the operation of those dampers but, which under activation...
4213227 Telescoping heat responsive releasing means  
A novel telescoping heat responsive releasing device is described wherein a mounting member on which a bimetallic means is mounted slidingly engages a pawl member which is movable between a first...
4195384 Self-resetting, cable operated translating drive link  
A novel telescoping heat responsive releasing device is described wherein a mounting member on which heat responsive and locking means are mounted slidingly enages a pawl member which is movable...
4161804 Heat-actuated door latch  
A door control comprising a heat-actuated door latch and a combination door-closing-arm holder and release. An optional smoke detector is located within a holder-release housing. During normal...
4121319 Releasable retaining means  
Means are provided for retaining fire doors in the open position against the action of the spring or other automatic door closers, with remote control release which can be actuated if a fire is...
4074388 Resettable, heat actuatable fire link  
A resettable fire link is described comprising a releasable member, gripping means for engaging said releasable member in the normal position and for releasing said releasable member in the...
4069544 Electrically actuated door holder and release  
This disclosure relates to an electrically actuated door holder and release for the multi-point holding of a pivoted door at selected door opening angles, and for the release of a held door either...
4050114 Door closer assembly  
A door closer hold open assembly connectable to a door for closing a held open door in response to a control signal includes a housing, a linkage assembly connectable to the door, biasing means...
4040143 Releasable door hold-open device  
A releasable door hold-open device or assembly is mounted on the header over a door panel. The assembly has a track channel with a top web and depending flanges. A door panel connector arm has a...
4034437 Pressure-free fail-safe emergency door closer  
A normally pressure-free, failsafe, emergency door closer for use in hospitals, nursing homes or other locations where handicapped persons are housed, comprising an actuating mechanism triggered by...
3983599 Temperature actuated keying device for use in an automatic door closing mechanism  
A temperature actuated keying device for use in an automatic door closing mechanism which comprises a pair of thin, long plates for clamping members pivotally connected to each other at overlapping...
3964125 Electromagnetic door holding device  
An electromagnetic door holding device for a door closer of the type having a spring operated rotating spindle operatively connected by an arm to a slider mounted for reciprocal movement in a track...
3935614 Electromechanical door holder-closer  
An electromechanical door holder-closer includes a conventional door closer which has a shaft rotatable in response to movement of a door between its open and closed positions and resilient means...
3934306 Door closure device  
A safety device for automatically closing a door in response to a predetermined condition, such as fire, is provided by a selectively disengageable brake operatively associated with a pivotable...
3905063 Condition responsive door holder-closer  
A surface-mounted door holder-closer responsive to the particulate products of combustion passing through multiple passageways formed in a holder-closer housing cover, a holder-closer assembly...
3889314 Heat actuated link  
A releasable link is provided to open under predetermined conditions; said link having the capacity to reset under predetermined temperature conditions. The link includes a novel tapered,...
Matches 1 - 50 out of 75 1 2 >