Abstract: A hinge arrangement having a first hinge part and having a second hinge part, which are connected to one another such that they can pivot, a first hinge pin being formed on the first hinge part, on which a first hinge sleeve is pivotably mounted, which forms a first sliding bearing with the first hinge pin, a dimensionally stable support part being connected to the first hinge sleeve. A first axial protrusion is formed on a first axial end face of the first hinge pin, which engages in an arcuate first groove of the first hinge sleeve, wherein a circumferential first side wall of the first groove together with the first axial end face and an inner side of an end cover fixed at the end of the first hinge sleeve delimits a working space which is filled with a damping fluid for damping a relative movement of the first axial protrusion with respect to the first groove.

Abstract: A door damper assembly that includes a housing, a damper that includes a fixed end and a movable end disposed within the housing, a carriage assembly that is movable within the housing between a closed position and an open position, a claw assembly pivotably attached to the carriage assembly, and a spring positioned to bias the carriage assembly to the closed position. The movable end of the damper is secured to the carriage assembly. The claw assembly is movable with the carriage assembly between the closed position and the open position. The claw assembly is movable relative to the carriage assembly between a non-toggle position and a toggle position. The claw assembly includes a pin receiving space defined therein that defines a claw axis that is generally vertical when the claw is in the non-toggle position and not vertical when the claw assembly is in the toggle position.

Abstract: A safety switch (2) with a latching unit (12), by means of which an associated actuator (3) is held in a latched position. The latching unit (12) has an opening (9) and a blocking element. In a latched position, the blocking element projects into the opening (9) and rear-engages an actuator head (8) of the actuator (3), which is in the latched position. The blocking element is held in the latched position by means of a positioning element with a setting force. When the actuator head (8) is inserted into or removed from the opening (9), the actuator head (8) pivots the blocking element out against the setting force.

Abstract: An aircraft propulsor with a thrust reverser with a pressure relief system is disclosed herein. The aircraft propulsor can include a flow path and a blocker door configured to block the flow path to divert airflow within the flow path to generate reverse thrust. The blocker door can include a main door and a pressure relief door. The pressure relief door can be coupled to the main door and configured to move from a closed position to an open position in response to flow path pressure greater than a threshold pressure. Moving the pressure relief door to the open position can relieve flow path pressure.

Abstract: A device that equalizes an aircraft pressure difference has a separating wall, fixable to the aircraft, and a decompression valve. The wall is for fluidically separating first and second spaces, and has a flow opening that fluidically connects the spaces. The valve closes the flow opening. A securing element on the valve or wall enables a release of the valve when a pressure gradient between the spaces is exceeded, such that there is a fluidic connection between the spaces. The receiving element on the wall or valve is connected to the receiving element. The securing element has a rotary element and fixing elements. The rotary element is rotatably mounted about a rotational shaft. The rotary element is receivable in the receiving element. The fixing elements non-rotatably fix the rotary element beneath the predetermined pressure gradient. At least one of the fixing elements is a spring.

Abstract: A magnetic duct access door provides for frequent access to a variety of different kinds of duct. The access door allows for an efficient magnetic attraction to a metallic duct and easy manual removal of the access door by tilting the access door via handles on its front surface. The access door includes: an access door base; a plurality of magnets arranged around the periphery of the back surface of the access door base; a compressible sealing member located between the magnetic attachment pads on the back surface of the access door base; at least one handle portion extending from the front surface of the access door base.

Abstract: An apparatus for latching a door having a latching member; a retention cam wherein the retention cam further comprises an extended face and is rotatable about its axis; a spring; a locking member; an actuator; a push out member; and a driving member; wherein the actuator drives the driving member to remove the locking member from contact with the retention cam and the driving member drives the push out member to push the latching member away from the retention cam. The apparatus is capable of assisting both in the latching and unlatching of the device.

Abstract: Certain embodiments relate to a hold-open assembly for a door closer including a pinion operable to rotate in a closing direction and an opposite opening direction. The hold-open assembly includes a ratchet wheel, a pawl, a controller, and a driver. The ratchet wheel is structured to be mounted to the pinion for joint rotation therewith. The pawl has an engaged position in which the pawl prevents rotation of the ratchet wheel in the closing direction, and has a disengaged position in which the pawl permits rotation of the ratchet wheel in both the opening direction and the closing direction. The controller is operable to determine a release condition and is configured to transmit a release signal in response to determining the release condition. The driver is configured to move the pawl from the engaged position to the disengaged position in response to the release signal.

Abstract: A method and apparatus for a gas turbine engine including a core engine a nacelle surrounding at least a portion of the core engine and defining an interior with an opening. An access door for the opening to provide selective access to the opening where the access door provides pressure relief for the interior.

Abstract: A positioning element permits the panel or engine bonnet of a motor vehicle to be brought from the closed position into a position in which a gap forms between the upper edge of the opening and the lower edge of the panel. The panel can thus easily be unlocked and fully opened. The positioning element with inner lever and outer lever is connected to a drive component, which via the drive element and the drive pawl with a detent ensures that the panel is brought in a simple manner via the levers into the first raised position, for which purpose the detent is pushed into the recess of the outer lever and thus brings the outer lever and the inner lever into the first raised position. Once the panel has been brought by spring loading into the second raised position with the aid of the spring-loaded inner lever, the upward travel is completed, so that by means of the spring force associated with the outer lever, said outer lever then quickly pivots both levers back into the initial position.

Abstract: The disclosure discloses a door device including a panel, a pivoting arm module, and a door. The pivoting arm module includes a holder and a panel-pivoting arm. The holder is located in a doorway of the panel and fixed to the panel. The holder has an entrance and an accommodating trough. The panel-pivoting arm is slidably accommodated in the accommodating trough and can present a received status or an ejected status relative to the holder. The door is pivotally connected to the panel-pivoting arm. When the panel-pivoting arm presents the received status, the door abuts against the panel and closes the doorway, and the appearance surface of the door is flush with that of the panel. When the panel-pivoting arm presents the ejected status, the door leaves the panel and can rotate relative to the panel-pivoting arm to open the doorway.

Abstract: Provided is a door opening and closing device wherein the device width can be made small and wherein the movement of a retraction arm can be stabilized. In a body case (102) which is slender and extends in one direction, there is provided an arm block (121) for a retraction arm (104) which rotates from the open state to the closed state. On one side of the body case (102), there is provided a first slider (134) which, being interlocked with the rotation of the arm block (121), makes linear movements in one direction. In the body case (102), there is provided an arm shaft (105) which serves as the center of rotation of the arm block (121). A second slider (131) which, being interlocked with the rotation of the arm block (121), makes linear movements in one direction, is provided opposite the first slider (134), in such a way as to have the arm shaft (105) held between the first and second sliders (134, 131).

Abstract: Provided is a door opening and closing system capable of returning to a return state where a catch and a retractable arm are engaged with each other even if the retractable arm is closed completely as a result of incorrect usage such as a prank. A catch has a catch base which is mounted on either one of the door and a frame and a catch shaft which is installed in the catch base slidable in an axial direction and engaged with a retractable arm. At a tip end of the catch shaft, a small-diameter part is provided as a step part. The step part of the catch shaft and the retractable arm are engaged with each other in a state where the retractable arm is further rotated in the closing direction after a main body part of the catch shaft and the retractable arm are engaged with each other.

Abstract: A hood stay apparatus for an engine room in heavy construction equipment. The hood stay apparatus can safely keep an engine hood in an open state even if an external force is abruptly generated due to vibration, wind, and the like. The hood stay apparatus can also facilitate an opening/closing operation of the engine hood.

Abstract: The present invention relates to a method of operating a panel system including a moveable panel and an opening, the method characterised by the steps of aligning the panel with respect to the opening in an alignment plane so that the panel is capable of moving across the opening in the alignment plane, and positioning a panel release mechanism such that a user pushing on the panel along the alignment plane causes the panel release mechanism to release the panel from a fixed position within the panel system.

Abstract: In an acceleration and deceleration device which includes at least one energy storage device and a cylinder with at least one piston movably disposed in the cylinder and moved therein by a carrier element and a sliding door including a slidable door panel provided with an acceleration and deceleration device, a second carrier element is provided guiding either the first piston or the second piston for movement in the cylinder so as to control the movement of pistons and of the sliding door near its end positions.

Abstract: An opening device including an elongate ejector ram mounted in a longitudinally displaceable manner in a housing and pretensioned at one end by a spring into a position in which it protrudes out of the housing and pushable back into the housing counter to the pretensioning. A releasable locking device locks the ejector ram in a position retracted in the housing. A tensioning device is provided forcibly displaces the ejector ram. When the movable furniture part is completely opened, a tensioning device forcibly displaces the ejector ram into the locking position retracted within the housing. The tensioning device converts the opening movement of the movable furniture part in the interior of the housing via a tensioning member having one end guided out of the housing into a movement pulling the ejector ram back into the retracted position.

Abstract: A catcher member is provided to be movable between a standby position and a retracted position, and at the standby position, while being urged by an urging device, the catcher member is positioned in the standby position by a holding device. When a movable body is moved forward a predetermined movement position, a striker member is caught and engaged with the catcher member positioned in the standby position, and subsequently, holding by the holding device is released, and the catcher member is moved or relatively moved up to the retracted position by being urged by the urging device, so that the urging force is applied to the movable body up to position where the movement ends. An operation device is provided so as to be able to operate to move the catcher member which was moved to the retracted position without catching the striker member, toward the standby position.

Abstract: A sliding assistance mechanism for helping a switching operation of a moving body on a main body side, includes a case attached to the main body side; first and second moving members slidably placed in the case, respectively; a pair of latches pivotally supported at each moving member, respectively, and releasably locked to corresponding parts of a case side; an urging device provided between both moving members; and a guide groove provided in the case for moving the latches along the same; and first and second operational members spaced apart from each other and provided in the moving body. When the moving members are at a halfway position, an engagement of one of the latches with the second operational member provided in the second moving member is released, and the moving body is pulled by the urging device to the second position.

Abstract: An assembly for securing a hinged building window (11) in closed position relative to an aperature defined by a main frame (12). The assembly includes a compressible gasket disposed between the hinged building window (11) and the main frame (12) defining the aperature. The hinged building window (11) and the main frame (12) each includes a respective portion (20) of a magnetic means for securing the hinged building window said (11) to the frame (12), where the magnetic means for securing includes a two magnetic magnets that are magnetically attracted to one another.

Abstract: A door system includes a structural member and a door that is movably mounted with respect to the structural member for movement between an open position and a closed position. A spring is mounted with respect to the structural member or the door and being sufficiently positioned to bias the door toward its open position when the door is in its closed position. Active material based actuators may selectively compress the spring prior to door closure to minimize door closing effort.

Abstract: A door opening and closing mechanism in which a door to be attached to a body having an opening is separated from, and made in contact with the periphery of the opening so that the opening is opened and closed, is provided with: a handle that is shaft-supported on the door and allowed to pivot with an operation portion being held; and a lever member that has a supporting portion that is attached to the door so as to freely pivot thereon, a connecting portion that is connected to the handle so as to freely pivot thereon on the same side as the operation portion with respect to the rotation axis of the handle, and a contact portion that is placed on the side opposite to the connecting portion with respect to the supporting portion, and arranged face to face with the periphery of the opening, and in this structure when the operation portion is pulled, the contact portion is allowed to press the body so that the door is separated from the periphery of the opening with a predetermined distance.

Abstract: A window or door assembly having a secondary sash hinged to a prime sash and movable between a closed position and an open position toward an interior region. The prime sash is coupled to a frame. A compressible member biases the secondary sash toward the open position. A latch assembly is provided including a plurality of retractable latching elements each biased to an extended position to retain the secondary sash in the closed position. The latch assembly includes a sliding operator accessible from the interior region and slidable along an edge of the secondary sash to sequentially displace the retractable latching elements to a retracted position sufficient for the compressible member to move the secondary sash toward the open position.

Abstract: A barrier release mechanism (1) for a barrier (3) including at least one barrier latch (170), a latch actuation device (7) disposed adjacent the barrier (3) and coupled to the barrier latch (170), the latch actuation device being movable between an engaged position in which the latch actuation device (7) causes the barrier latch to be engaged thereby latching the barrier (3) and a disengaged position in which the latch actuation device (7) causes the barrier latch (17) to disengage thereby allowing the barrier (3) to be moved, the latch actuation device (7) being resiliently biased by a spring (6) into the disengaged position. A source of fluid pressure is in fluid communication with the latch actuation device (7) and a pressure control valve disposed intermediate the latch actuation device and the source of fluid pressure.

Abstract: A security door closure system for cruise ships and other similar public entrance points to prevent terrorist attack or ship take-over is needed. Cruise ship passenger and ship provisioning entrance gangplanks pass through large hydraulically operated shell doors. The gangplank must be removed to close the shell door. The quick close security door system (Door-Gate) is a portable bullet resistant rapid close door system that is placed in conjunction with the gangplank or other entry system, which when closed prevents forced entry. A single lever either remotely or manually operated immediately closes the doors, which then cannot be forced opened from the entrance side.

Abstract: A closure panel arrangement is provided in which a closure panel 6 can only be retained when appropriately aligned with engagement between clasp hooks 8 and pins 9 is achieved along with association between latch hooks 10 and pins 11. If there is not appropriate association and alignment then a bias 12, 22, 32, 42 creates an outward bias force upon the closure panel 6 whereby the panel 6 will continue to fall out. In such circumstances, the panel 6 cannot remain in position due to simply key fit interference/friction association of sufficient strength for non-operational conditions but which will fail during operation due to vibration or stresses.

Abstract: This invention relates to a closure arrangement for closing an opening in a base component. In particular—but not exclusively—this invention relates to a closure arrangement for a container, to serve as an openable lid for the container.

Abstract: A door hold open and controlled release mechanism is designed for usage in a doorway system having an inner door, an outer door and a door closer. It includes a catch mechanism and a catch release mechanism. The catch mechanism holds the outer door, typically a screen door or storm door, in an open position against the closing tendency of the door closer. Movement of the inner door to an open position then toward a closed position triggers the catch release mechanism which allows the outer door to close under the urging of the door closer.

Abstract: An opening flap comprises a frame and a flap articulated thereto. A lift arm is provided, which is articulated by a principal energy accumulator. A secondary energy accumulator is articulated between the lift arm and the flap. The principal energy accumulator delivers the opening motion of the flap into a position before the dead center thereof. The secondary energy accumulator, which is distinctly weaker, delivers the subsequent opening motion.

Abstract: An aircraft servicing pit that defines a subsurface chamber below a surface across which aircraft travel when not airborne is formed of a prefabricated pit body atop which a pit lid is mounted for rotation. Within the enclosure of the pit beneath the surface across which the aircraft travel a counterweight system is connected by gears to pit lid supporting arms. The pit lid supporting arms have proximal ends rigidly joined to pit lid gears, which are meshed with counterweight gears rigidly joined to counterweight arms supporting counterweights within the enclosure of the pit. The pit lid and counterweight arms move in counterrotation when the pit lid is opened and closed, with the gravitational force acting upon the counterweights acting in opposition to the force of gravity upon the pit lid.

Abstract: A self-closing access door for use with external umbilicals in aerospace launch vehicles is provided. The self-closing access door comprises two door panels joined by a spring-loaded hinge, the latter of which is attached to surrounding structure of the vehicle. When an external source is applied to the door panels, the panels are opened such that fluid flow, i.e. air conditioning, may enter the vehicle from the external umbilical. When the external source is removed, the spring-loaded hinge forces the door panels closed. The self-closing access door further comprises latches on each door panel that firmly secure the door panels to the surrounding structure. A cover plate is also provided that includes an outer lip for attachment to the surrounding structure and an inner lip, which is engaged by the latches. The spring-loaded hinge also comprises a door stop that limits the distance that the door panels may be opened.

Abstract: An emergency opening device for a swinging folding door or a swinging folding gate, using an electric motor drive with a switchable electromagnetic coupling for closing and opening the door panels. The door has an emergency opening device, whereby the emergency opening device consists of an elastic tension or compression device to which a pre-load can be applied during the closing of the door. The tension or compression device can be engaged in the drive shaft of the outer panel or in the vicinity of the main closing edge of the inner panel.

Abstract: A device for automatically closing a closure installation (such as a window or a door) includes a drive device, a traction mechanism, a spring, an actuating device and a locking device. The closure installation is mounted in a frame supported by a building. The traction mechanism is located between the closure installation and the frame, and is driven by the drive device to close the closure installation. The spring is tensioned when the closure installation is placed in the open position, and supplies the energy to the drive device which is required to close the closure installation. The actuating device is used to initially place the closure installation in the open position. The actuating device tensions the spring when the closure installation is placed in the open position. The locking device is initially released to permit the closure installation to be placed in the open position.

Abstract: An enclosure has an outer surface and an inner surface and an opening extending between the outer and inner surfaces. The outer surface of the enclosure includes a curved region surrounding the opening; the curved region having a radius. The enclosure includes a resilient cover which is hingedly secured to the enclosure for selectively covering the opening. The resilient cover moves between a first open position and a second closed position. The resilient cover is molded to normally have a first radius which is greater than the radius of the curved region of the enclosure. When in the first open position, the resilient cover defines an arch having the first radius. When in the second closed position, the resilient cover is compressed and flexes so as to conform to the shape of the curved region of the enclosure. Thus, in the second closed position, the resilient cover defines an arch having a second radius which is smaller than the first radius.

Abstract: A door opening and closing mechanism, wherein a swinging door to cover an opening for loading, unloading, or exchanging discs comprises two doors, an upper door (14) and a lower door (13), each of which is supported by pivots (14a) and (13a). The opening is covered, when closing the doors, with the two doors, the upper door (14) and the lower door (13), by an interlocking motion by engaging a sliding guide (14b) provided on the upper door (14) and a sliding pin (13b) provided on the lower door (13). When opening the doors, the lower door (13) is nested inside the upper door (14) guided by pivots (14a), (13a), the sliding guide (14b), and the sliding pin (13b), whereby the amount of the projection of the doors when open corresponds to the projection only of the upper door (14).

Abstract: An improved access lid assembly is provided for a subsurface chamber used to service aircraft. A lift assembly is provided for elevating the lid upwardly from an opening in a surrounding mounting frame disposed atop the subsurface chamber while maintaining the lid in a horizontal disposition. A hinge assembly connects the lift assembly to the lid at a peripheral location thereon on the underside of the lid, without any connection to the peripheral edge of the lid. The hinge assembly allows the lid to rotate about a horizontal axis to an open position through an arc of at least ninety degrees. By avoiding any connection to the peripheral edges of the lid, an elastomeric, annular seal can be mounted to completely encircle the lid and provide a water-tight barrier about the access opening. The seal is mounted between the upper and lower surfaces of the lid within a groove, preferably with a dovetail connection, to securely grip and hold the seal upon the edge of the lid.

Abstract: Racks (20) supported on a transfer cart (38) in a decontamination area (18) are loaded with contaminated articles. The carts are wheeled to a washer (14) into which the racks of contaminated articles are placed for washing. After washing, the racks are removed from the washer in a preparation and packing or clean room (12) and unloaded. The empty racks are moved through a rack return (28) back to the decontamination area. The rack return includes a rack supporting surface (32) on which glide strips (42) are mounted for sliding the racks from the clean room to the decontamination area. Guide strips (44) guide the racks to a pair of vertically pivoted polycarbonate doors (34) which the racks push open by engaging bumpers (58). After the rack has passed through the doors, a self-closure mechanism (60) closes the doors automatically. The rack return assembly includes stops (76, 78) on both sides for aligning a rack carrying cart of any of a plurality of sizes accurately with the rack return assembly.

Abstract: An electromechanical locking mechanism for door leaves whose holding force can be adjusted continuously and which at the same time offers the possibility, when the locking mechanism is energized, of also releasing the closed door from and returning it to the locked position.

Abstract: The subject invention is a delay door closer that is to be used in conjunction with a dual door arrangement such as a screen door mounted in conjunction with an entry door of a house or other building. A catch mechanism is mounted on the door jamb with the catch mechanism functioning to lock and hold the screen door in an open position when the entry door is in the closed position. Upon opening of the entry door a sufficient amount to where the user is now able to enter the building, the catch mechanism is disengaged which will cause the screen door to be moved from its open position to a closed position.

Abstract: A door closer includes a casing fixedly fastened to a door leaf, a shaft turned in axle holes in the casing, a spiral spring mounted around the shaft within the casing and having one end fixed to the shaft and an opposite end fixed to the casing and adapted for returning the door leaf to the close position each time it is opened, a rack fixedly fastened to a door frame to which the door leaf is hinged, a bevel gear fixedly mounted on one end of the shaft and turned with it along a 90-degree arc toothed bar section of the rack, and a curved springy holding down plate fastened to the rack and adapted for holding down the bevel gear to keep the door leaf to be retained in an open position.

Abstract: A fiberglass, insulated bulkhead door assembly overcomes the limitations of conventional wooden and metallic storm doors. A preassembled bulkhead door assembly is positioned atop a preexisting concrete foundation. Once in place, the bulkhead forms a liquid tight barrier. As an insulated, lockable structure, the bulkhead door assembly provides a means of ingress into and egress out of a basement of a dwelling structure. The base support and door of the bulkhead door assembly incorporate an insulative layer sandwiched between a pair of molded fiberglass panels, which are then covered by a durable gel coat finish. The combination of insulation and fiberglass maintains an effective thermal barrier between the basement of the dwelling structure and an exterior environment. A pair of pneumatic struts counterbalance the door into an upright position.

Abstract: An apparatus is disclosed for mounting a chamber door between open and closed positions relative to the opening of a sterilizer or autoclave chamber. The apparatus is adapted to be used in either motorized or non-motorized embodiments. The weight of the chamber door is offset by a counterweight and suspended using a cable and pulley system. In the non-motorized embodiment, the door/counterweight system is held in place by a securement, which, when disengaged, permits free motion of the door. In the motorized embodiment, a second cable and pulley system is used to connect the door and counterweight. The cable from this second system is looped around a sheave which is adapted to provide a predetermined frictional force. The sheave is then connected to and rotated by a motor, and upon activation of the motor, the rotating sheave displaces the cable, which respectively raises or lowers the door and counterweight.

Abstract: A closure apparatus for a subsurface pit for servicing an aircraft located beneath an aircraft servicing surface across which aircraft travel is provided with an improved spring biasing arrangement. The system employs separate springs interposed between the hollow body of the pit and the lid so as to urge the pit lid from its horizontal seated position toward a fully raised position. Obstructions are provided for separately intercepting and disengaging the springs from acting against the pit lid as the pit lid is opened through intermediate angular positions between the horizontal seated position and the fully raised position. By sequentially isolating the pit lid from the action of each of the springs, one at a time, the moment of spring force opposing closure of the lid more closely follows the moment of the force of gravity tending to close the lid. This substantially reduces the maximum manual force that is thereby required to overcome gravity in opening the pit lid.

Abstract: The welding frame (3) of a film-welding device (2) is at the start of its pivoting movement motor-driven in positive manner over a few radians and is then released from the drive, so that only on the basis of its flywheel energy and weight force is it moved on to the locked closed position. Thus, accident risks can be avoided without separate control means, because for stopping the welding frame (5) it is essentially only necessary to dissipate the relatively low flywheel energy.

Abstract: Remote control equipment for remotely opening a vehicle door. A manual operated remote control transmitter transmits a signal to a receiver mounted on the vehicle which causes door mounted motor actuators to unlock and unlatch the door after which a prebiased mechanical door opener functions to open the door wide enough to permit ready access to the vehicle.

Abstract: A heavily insulated emergency smoke hatch door is equipped with an operating mechanism which is located external to a cooler and/or freezer. This external location of the operating mechanism provides for the accommodation of heavier weight doors without effecting the venting area or access to the interior of the cooler and/or freezer. A latching mechanism keeps the door in the closed position and may be equipped with an automatic release device which will release the door upon sensing of a fire for heat within the cooler and/or freezer. Once the hatch door is released, the operating mechanism is operable to open the door for venting and access.

Abstract: A power door operator for multi-passenger mass transit vehicles, typically buses, features electric actuation of dual swinging doors. A manual activator having an ergonometrically correct actuating plunger, for emergency door opening, operates a sleeved clutch. Fixed to the sleeve clutch is a drive bar with arms having individually adjustable lengths. The drive arms actuate outboard door shaft levers on individual door leaf through door drive rods intermediate the door arms and drive arms. Each rod incorporates spherical rod ends. The drive arms also actuate limit switches establishing door opened and door closed circuitry for energizing the electric drive system. The adjustable length clutch door drive arms provide a convenient device for controlling door leaf closing sequence and residual or door holding force when the doors are in a closed position.

Abstract: A device for fastening an ajar door of the operator's cab of a construction machine, which is small in size, presents a good appearance, and is easy to unfasten, has a plate support element (5) fixed to the outer surface of the operator's cab (2), a tubular support element (6) to hold the plate support element, a U-shaped striker (10) fixed to the plate support element, a lock (20) for holding the striker when the door is ajar, and a releasing lever (30) for releasing the lock from inside the operator's cab.

Abstract: A fire door closure reset system including a fire door movable between an opened position and a closed position relative to an opening through a wall; a lock for being pivotally attached relative to the wall for movement between a locked position and an unlocked position and for allowing the fire door to move to the closed position when in the unlocked position; a spring for urging the lock to the unlocked position; a cable having a first end for being attached to the lock and having a second end for being fixedly attached relative to the wall; the lock being held in the locked position when the cable is taut; the spring urging the lock to the unlocked position when slack is placed in the cable; occurrence responsive structure for placing slack in the cable in the event of a predetermined occurrence; and a test-reset mechanism for allowing the operation of the fire door closure reset system to be tested by placing slack in the cable and for allowing the slack in the cable to be subsequently removed after the

Abstract: A door closing mechanism, preferably mounted on a counterbalanced door assembly, which provides a mechanical advantage to close the door and overcome the forces of friction, inertia and any counterbalancing forces. A slot plate with a curved control slot is mounted to the door. A control arm, pivotally mounted at one end to the door frame, has a handle and slot engager mounted at the other end. The slot engager slides along the control slot and pulls the door closed as the handle is pulled. The control slot is preferably curved only along a first portion and straight in a second portion to provide greater mechanical advantage at the beginning of its motion.