Abstract: A device for the synchronized actuation of sliding doors, provided for two sliding doors moving indistinctly in the same plane or in two planes forming any angle, consisting of two pairs of cogwheels (8-8?) and (9-9?) between which there is arranged, inside of each pair, an also cog belt (10-10?), a connection part (13-13?) fixed to the corresponding suspension grip (6-6?) of the respective sliding door being joined to each one of these belts. Joined to the two neighboring cogwheels (9-9?) there are respective cogwheels (18-18?) of a larger diameter, directly meshing with one another, to synchronously transmit motion from one cog belt (10-10?) to the other, cogwheels (18-18?) which are kept joined by means of parts (20) bridging their shafts (19-19?) and maintaining the drive transmission both when the doors are coplanar and when they form any angle.

Abstract: An emergency unlocking device for locking and unlocking systems for swinging sliding doors, in particular of rail vehicles. The emergency unlocking device has a traction device that engages on a first spring-loaded pivoted lever that is connected via a second lever to a third lever. The third lever is attached to the axial shaft of a spring-loaded rotary magnet and has elongate holes in which a bolt is displaceably mounted. When the traction device is subjected to tensile stress, the bolt engages with a fourth lever that is pivotably mounted on a shaft, and moves the fourth lever. The fourth lever is operatively connected via a coupling rod and deflection unit to a locking rod that moves the vertical direction. A rod, via which a force component that brings about the locking and unlocking of the door leaves can be applied, engages on the fourth lever.

Abstract: Elevator doors have operating bars that are pivoted on a car door and that serve to actuate shaft-door actuating rollers that operate shaft doors. These doors are operated by an apparatus having an actuating device that changes a spacing between the operating bars and that has an actuating lever coupled with a door actuator. This actuating lever is coupled with a first link pivoted on the operating bars. The actuating lever and the first link are pivotal through a predetermined angle. A latch for the car doors is provided with a tension element connected between one operating bar and the actuating lever.

Abstract: An apparatus for manufacturing or inspecting semiconductors comprising a main body, an opening arranged in the main body, and a safety door. The safety door includes a first door element for covering a first portion of the opening and a second door element for covering a second portion of the opening, the first door element having a movement direction along which the first door element is driven by a driving device, the second door element being urged toward the first door element along the movement direction of the first door element by an external force. If a part of a person's body should be caught between the first and second door elements, the second door element is urged against the external force by the force generated by the part of the person's body to protect the part of the person's body.

Abstract: An automated garage door opener for opening an outwardly swinging door pivotally mounted about a vertical axis. The garage door opener includes a track, a trolley slidably mounted on the track, and at least one push bar having a first end and a second end. The push bar pivotally couples with the trolley at the first end and with the outwardly swinging door at the second end. A trolley coupling is provided for pivotally connecting the first end of the at least one push bar with the trolley. A door coupling for pivotally connecting the second end of the least one push bar with the outwardly swinging door is also provided. The door coupling is mountable on the outwardly swinging door. The push bar includes a spring biased slip joint for automatically adjusting the length of the push bar as the door opener is operated.

Abstract: Closure for closing one or more openings (O) of an air-conditioning system, in particular ducts or air-guiding elements that form part of an air-conditioning system. The closure (1) has a plurality of closing elements (3a to 3z) that are arranged (when viewed in a common displacement direction (V)) essentially in one plane (P), so as to be displaceable in parallel with one another, either together in the same direction and/or in opposite directions with respect to one another, in the displacement direction (V).

Abstract: A gear shaft assembly for actuating linear movement of an object, including a lower channel assembly, which includes: (a) a threaded rod; (b) a first gear adjacent an end of the threaded rod; (c) a second gear engageable with the first gear and attached to the end of the threaded rod; (d) a mechanism for driving the first gear against the second gear; (e) at least one threaded journal bearing threaded on the correspondingly threaded rod; (f) at least one bearing housing supporting the at least one journal bearing; (g) a movable carrier arm mounted on the threaded rod and attachable to the object; wherein, when the drive mechanism activated, the first gear drives the second gear, rotating the threaded rod, and moving the carrier arm on the threaded rod. A tandem gear shaft assembly and a method for installing a gear shaft assembly and shutter on a window are also included.

Abstract: A door suspension assembly includes a ferromagnetic flat plate horizontally extending from a support rail adapted to be attached to a door frame above a doorway or entrance portal. Two supporting blocks each have an opening in which a cylindrical bearing with an axial hole is located. The supporting blocks are attached to a door panel. Connectors extend downwardly from the flat plate and support a tube that extends through the holes in the bearings. A magnet array is supported by an upper plate attached to upper ends of the supporting blocks with a small magnetic gap between the magnet array and the flat plate such that the magnet array generates a magnetic force lifting the supporting blocks and the door panel. A primary of a linear motor is attached to the upper plate between the supporting blocks and cooperates with a secondary located in the interior of the tube to move the door panel relative to the flat plate.

Abstract: A door system for a cold storage locker has increased resistance to damage by including resilient door panels that flex when hit by a forklift. A high degree of insulation is achieved by the choice and thickness of the resilient foams therein. Also, the resilient door panels are magnetically attracted to a gasket seal on a doorframe to provide an affirmative seal. Active magnetic control may enhance the attraction or repulsion of the door panel. Frost control is realized by warming air from the cold storage locker and passing it through air channels in the door panel proximate to the gasket seal and down an astragal interface between door panels.

Abstract: A vehicular sliding window assembly of the present invention includes first and second spaced apart fixed window panes and a polymeric member provided on perimeter portions of the fixed window panes. The polymeric member forms a gasket and includes at least one lower guide track molded in the polymeric member. At least one sliding window pane is positioned in the guide track and is positionable between a closed position and at least one open position. The window assembly further includes a support rail, which supports the sliding window pane above a lower surface of the lower guide track whereby the weight of the sliding window pane is borne by the support rail and not the lower guide track to reduce the friction between the guide track and the sliding window pane to provide a smooth sliding action when the sliding window pane is moved along the guide track between its closed and open positions.

Abstract: An electric drive motor drives a door to move in an open/close direction. A pulse encoder outputs a series of pulses. Each pulse has a pulse duration sized to correspond to a rotation speed of the motor. The number of the pulses corresponds to the number of revolution of the motor. A door jamming detecting device for detecting a jamming of the door is configured to carry out calculating a total duration time (Tn) of a given number (n) of the series pulses outputted from the pulse encoder; detecting a given condition wherein the total duration time (Tn) is greater than a threshold value (Ts); and making a judgment of the door jamming when the given condition is kept for a given time (Tm).

Abstract: A device for urging a door into a first position includes a spring apparatus (16) including a winding drum (22) having a conical outer peripheral surface (27) and a torsional spring (24) for imparting a relatively constant urging force to a cable 23 secured to the door in the direction of the first position.

Abstract: A door suspension system includes a rail support attachable to a crosspiece of a door and having a part shaped as a rigid substantially flat plate that supports a rail. A pair of brackets, each having a connector, are attached to support block having an opening in which the rail is partially received. The connectors have a substantially C-profile embracing the flat plate and the rail. A support strip is attached to the connectors and is provided with a connection device for suspending the door of an elevator. A magnetic way is attached to the plate and an elongated primary of a linear motor is attached to the strip in such a manner that the attraction force between the magnetic way and the primary cancels at least partially the weight of the door. The door suspension system further includes a bearing of substantially cylindrical shape with an axial recess. The bearing is mounted in the opening of the support block to guide the rail.

Abstract: A power sliding assembly for moving a windowpane within a track within a window frame between an open position and a closed position. The power sliding assembly includes a motor fixedly secured to the window frame. The motor generates a rotational force. The power sliding assembly also includes a lead screw that is operatively connected to the motor to translate the rotational force to axial movement. In addition, the power sliding assembly includes a bracket secured to the lead screw and the windowpane. The bracket travels with the lead screw as the lead screw is driven axially along the track to move the windowpane between the open and closed positions.

Abstract: A door operator having a door hanger comprising a pair of double trolley assemblies disposed for linear movement within a hanger rail, wherein each trolley assembly further comprises two rollers mounted substantially opposite one another and engaging roller cavities within said hanger rail. Said door hanger is integrated with the drive system or is mounted independently of the drive system for replacement of the door hanger of the prior art or in new application requiring such independency between the door hanger and drive system.

Abstract: A sliding door operating mechanism for a vehicle to provide access to the vehicle through an opening in a wall thereof, includes at least one sliding door and a reciprocating power mechanism and a transmission mechanism for transmitting movement of power to the door for performing opening, closing and locking movements thereof. A beam structure carries the door, the power mechanism and the transmission mechanism. The beam structure extends across and is accommodated within an upper portion of the opening so as to be slidingly movably driven by the power mechanism between a relatively retracted position within the opening, in which the door is located in a first plane in a closed position confirmed within the opening, and a relatively less retracted position, in which the door is located in a second plane exteriorly of the opening allowing movement of the door along the second plane.

Abstract: A door system for a cold storage locker has increased resistance to damage when by including resilient door panels that flex when hit by a forklift. A high degree of insulation is achieved by the choice and thickness of the resilient foams therein. Also, the resilient door panels are magnetically attracted to a gasket seal on a doorframe to provide an affirmative seal. Active magnetic control may enhance the attraction or repulsion of the door panel. Frost control is realized by warming air from the cold storage locker and passing it through air channels in the door panel proximate to the gasket seal and down an astragal interface between door panels. Door panels of laminate, bagged poured foam formation, and self-skinning foam formation give further reduced cost of manufacture and shipping.

Abstract: A sliding door for selectively opening and closing an opening is disclosed. The door comprises a first guide track defining a first linear guide path and a second guide track defining a second linear guide path. The second guide track is spaced from the first guide track. The door further comprises a door panel having a top edge, a bottom edge, a leading edge and a trailing edge. The door panel is adapted to translate laterally relative to the opening between a closed position and an open position. A first portion of the door panel is attached to the first guide track and a second portion of the door panel is attached to the second guide track.

Abstract: The present invention teaches a powered door operator for passenger transit vehicles having a drive nut assembly engaging a door hanger bracket substantially connected to a door disposed within an aperture of the vehicle structure. Such drive nut further engaging a drive screw to move a door for covering and uncovering an aperture for ingress and egress of passengers in a wall of a transit vehicle upon rotation of the drive screw enabled by a rotary prime mover. The drive assembly comprises a housing having an internal cavity, at least one drive nut insert having a helix portion substantially identical to the drive screw helix and disposed within said internal cavity, and a retaining clip engaging said at least one drive nut insert for substantial retainment thereof. Retaining clip further provides for simple replacement of such at least one drive nut insert during maintenance cycles thereby substantially eliminating periodic lubrication generally employed with powered door operators of the prior art.

Abstract: A drive unit for doors, especially doors having a non-rectilinear profile formed by wings (26, 26′, 24, 24′, 124, 126) comprises a motor (10) whose rotary shaft (20) engages with at least a bar or section (12, 14) connected to at least one of said wings. The drive unit is located either on the roof or the external front of the lower basis or between the wings of an elevator car of story doors. In case of telescopic movement superposed wings, one of the wing is moved by the drive unit, and a transmission unit (100) transmits the rotation of a wing (124) to the other one (126).

Abstract: A tandem of independent powered door operators for passenger transit vehicles having a central lock mechanism and enabling each of the doors to be moved with a force of less than 80 N. Such door operators can be used on vehicles where the cross-sectional area within which to accommodate a door operator is limited. The door operator comprises an electric motor, a helical drive screw rotatably connected to such electric motor with a universal joint, a drive nut assembly engaged with such drive screw, a door hanger rod, a first door hanger bracket connected to a door and engaging the drive nut, a second door hanger bracket connected to a door and engaging a centrally located lock mechanism enabling locking of such door in a fully close position.

Abstract: A lock mechanism enabling locking of a bi-parting set of right hand and left hand door panels respectively suspended from a right hand and left hand door operators, to be driven by the door operators for covering and uncovering an aperture disposed within a passenger transit vehicle. Such lock mechanism disposed intermediate the door operators. The lock mechanism is capable of operating in a pushback and non pushback arrangement providing a fully-locked state, for each of the two bi-parting doors of a passenger transit vehicle. The integrated design allows the central lock mechanism to be installed and/or maintained over a doorway with only minimal adjustments needed to assure that the door lock assemblies operate in unison. As compared to separate door lock assemblies for each door panel as is typical of prior art designs, the central lock mechanism enables the door panels to be closed and locked more reliably and with better sealing against weather and noise.

Abstract: A sliding door operating mechanism for a vehicle to provide access to the vehicle through an opening in a wall thereof, includes at least one sliding door and reciprocating power means and transmission means for transmitting movement of the power means to the door for performing opening, closing and locking movements thereof. A beam structure carries the door, the power means and the transmission means. The beam structure extends across and is accommodated with an upper portion of the opening so as to be slidingly movably driven by the power means between a relatively retracted position within the opening, in which the door is located in a first plane in a closed position confined within the opening, and a relatively less retracted position, in which the door is located in a second plane exteriorly of the opening allowing movement of the door means along the second plane.

Abstract: A vehicular sliding window assembly of the present invention includes first and second spaced apart fixed window panes and a polymeric member provided on perimeter portions of the fixed window panes. The polymeric member forms a gasket and includes at least one guide track molded in the polymeric member. At least one sliding window pane is positioned in the guide track and is positionable between a closed position and at least one open position. The window assembly further includes a support rail, which supports the sliding window pane above a lower surface of the lower guide track whereby the weight of the sliding window pane is borne by the support rail and not the lower guide track to reduce the friction between the guide track and the sliding window pane to provide a smooth sliding action when the sliding window pane is moved along the guide track between its closed and open positions.

Abstract: A door apparatus for opening and closing two doors supported on a horizontal door rail includes an actuator connected to one of the two doors for driving the same, a direction conversion mechanism connected to the other of the two doors for transmitting a movement of the actuator to the other door to move the same and having an engaging portion formed of a first stage and a second stage, and a locking mechanism having a latch engaging the direction conversion mechanism for locking the two doors and non-engaging the direction conversion mechanism for allowing the two doors to open. The latch engages the first stage of the engaging portion to semi-lock the doors to be able to open manually, and engages the second stage of the engaging portion to lock the doors completely.

Abstract: A door suspension system includes a rail support attachable to a crosspiece of a door and having a part shaped as a rigid substantially flat plate that supports a rail. A pair of brackets, each having a connector, are attached to support block having an opening in which the rail is partially received. The connectors have a substantially C-profile embracing the flat plate and the rail. A support strip is attached to the connectors and is provided with a connection device for suspending the door of an elevator. A magnetic way is attached to the plate and an elongated primary of a linear motor is attached to the strip in such a manner that the attraction force between the magnetic way and the primary cancels at least partially the weight of the door. The door suspension system further includes a bearing of substantially cylindrical shape with an axial recess. The bearing is mounted in the opening of the support block to guide the rail.

Abstract: A door operator having a door hanger comprising a pair of double trolley assemblies disposed for linear movement within a hanger rail, wherein each trolley assembly further comprises two rollers mounted substantially opposite one another and engaging roller cavities within said hanger rail. Said door hanger is integrated with the drive system or is mounted independently of the drive system for replacement of the door hanger of the prior art or in new application requiring such independency between the door hanger and drive system.

Abstract: A tandem of independent powered door operators for passenger transit vehicles having a central lock mechanism and enabling each of the doors to be moved with a force of less than 80 N. Such door operators can be used on vehicles where the cross-sectional area within which to accommodate a door operator is limited. The door operator comprises an electric motor, a helical drive screw rotatably connected to such electric motor with a universal joint, a drive nut assembly engaged with such drive screw, a door hanger rod, a first door hanger bracket connected to a door and engaging the drive nut, a second door hanger bracket connected to a door and engaging a centrally located lock mechanism enabling locking of such door in a fully close position.

Abstract: A lock mechanism enabling locking of a bi-parting set of right hand and left hand door panels respectively suspended from a right hand and left hand door operators, to be driven by the door operators for covering and uncovering an aperture disposed within a passenger transit vehicle. Such lock mechanism disposed intermediate the door operators. The lock mechanism is capable of operating in a pushback and non pushback arrangement providing a fully-locked state, for each of the two bi-parting doors of a passenger transit vehicle. The integrated design allows the central lock mechanism to be installed and/or maintained over a doorway with only minimal adjustments needed to assure that the door lock assemblies operate in unison. As compared to separate door lock assemblies for each door panel as is typical of prior art designs, the central lock mechanism enables the door panels to be closed and locked more reliably and with better sealing against weather and noise.

Abstract: The present invention teaches a powered door operator for passenger transit vehicles having a drive nut assembly engaging a door hanger bracket substantially connected to a door disposed within an aperture of the vehicle structure. Such drive nut further engaging a drive screw to move a door for covering and uncovering an aperture for ingress and egress of passengers in a wall of a transit vehicle upon rotation of the drive screw enabled by a rotary prime mover. The drive assembly comprises a housing having an internal cavity, at least one drive nut insert having a helix portion substantially identical to the drive screw helix and disposed within said internal cavity, and a retaining clip engaging said at least one drive nut insert for substantial retainment thereof. Retaining clip further provides for simple replacement of such at least one drive nut insert during maintenance cycles thereby substantially eliminating periodic lubrication generally employed with powered door operators of the prior art.

Abstract: Door operator for opening, closing and locking at least one door panel on a transit vehicle. It has at least one base portion for mounting on the vehicle and at least one fixed support member attached to the base portion(s) . It has door hanger(s) for attachment of the door panel(s) and moveable door support member(s) attached to the door hanger(s). The moveable door support member(s) engage the fixed support member(s) to support the door panel(s) while permitting opening and closing motions of the panel(s) . The operator includes at least one door drive having base mounted portion(s) and hanger mounted portion(s), the hanger mounted portion(s) engaging the base mounted portion(s) to be moved thereby to move the panel(s) in opening and closing direction(s).

Abstract: Door operator for opening, closing and locking at least one door panel on a transit vehicle. The door operator has at least one base portion for mounting on the vehicle and at least one fixed support member attached to the base portion. The door operator has door hangers for attachment of the door panel to the fixed support member and moveable door support members attached to the door hangers. The moveable door support members engage the fixed support member to support the door panel while permitting opening and closing motions of the panel. The operator includes at least one door drive having a base mounted portion and a hanger mounted portion engaging the base mounted portion to be moved thereby to move the panel in opening and closing directions.

Abstract: A mine door system including at least two doors positioned in a mine passageway in spaced relation forming an airlock. The doors include at least one leaf movable between open and closed positions to allow passage into and out of the airlock. A control system controls operation of leaf movement actuators such that in normal operation, at least one door is always closed to control flow of air in the mine. A power source is included to effect movement of the leafs by the actuators.

Abstract: A transmission system installed in the track of a motor-driven blind and controlled to move vertical slats of the motor-driven blind between a received position and an extended position and to rotate the vertical slats in regulating the light after the vertical slats have been moved to the extended position. The transmission system includes a first power drive controlled to rotate the vertical slats to the desired angle through a transmission shaft and worm and worm gear sets, and a second power drive controlled to move the vertical slats from the ends of the track toward the middle or from the middle of the track toward the ends between the extended position and the received position through two reversed screws.

Abstract: An adapter for electric garage door openers including a sliding portion adapted for coupling with the track of the electric garage door opener. A pair of support bars extend between the sliding portion and the pair of outwardly opening garage doors.

Abstract: A door support and drive mechanism for a door can be mounted either over or in a door opening in a transit vehicle or other structure. The mechanism includes a tube which has a longitudinal slot. The mechanism also has mounts attached to the tube for mounting the mechanism to the structure over the door opening, so that the tube is substantially horizontal and the slot is along a lower portion of the tube. The mechanism includes at least one door hanger which has an upper portion movably disposed within the tube and a depending portion passing through the slot, the depending portion being for attachment to the door. The mechanism has a drive nut attached to the door hanger. A drive screw is positioned in the tube, engaging a threaded inner portion of the drive nut. The drive screw is connectable to a rotary power device to be rotated thereby. Rotation of the drive screw causes longitudinal movement of the drive nut and the hanger to which the drive nut is attached, so that the door is moved longitudinally.

Abstract: The invention relates to a locking device, in particular for a door, a tailgate, a trunk lid or the like of a vehicle, with at least one actuating drive which is capable of being activated in order to set functions of the locking device and which is operatively connected to an element of the locking device via at least one transmission element, according to the invention means being provided which detect the continuous movements and functional positions of the actuating drive or of the transmission element.

Abstract: Method of facilitating release of an object caught by one or more closing transit vehicle door(s) in a motorized door system having a two stage lock, the two stage lock having a fully locked position and a pushback lock position. The method includes detecting the presence of the object by the effect of the object on either the position or the velocity of the door(s). The method also includes determining whether the door(s) are in a pushback range between the fully locked position and the pushback lock position. If an object is detected and the door(s) are in the pushback range, then one or more signals are supplied to a motor of the door(s) to move the door(s) in the door opening direction to or toward the pushback lock position.

Abstract: A sliding door arrangement with at least one door leaf mounted in a door frame includes a drive for moving the at least one door leaf. The at least one door leaf has a lateral closing edge and a running surface at the lateral closing edge. The door frame has a counter-support surface, wherein, in a closed position of the at least one door leaf, the running surface is located essentially immediately below the counter-support surface and the counter-support surface rests on the running surface for preventing lifting of the door leaf.

Abstract: A one-leaf or two-leaf sliding door, swinging/sliding door or pocket door, particularly for vehicles, has an electric, pneumatic or hydraulic drive. A nut is attached to the at least one door leaf and a spindle extends through the nut. A drive for moving the at least one door leaf is provided either to rotate the spindle directly or to linearly move the at least one door leaf. A freewheel is mounted on an end of the spindle, wherein the freewheel has a component which is stationary relative to but capable of rotating together with the spindle. A releasable brake or clutch is provided for preventing rotation of the freewheel component.

Abstract: A power door for a transit vehicle includes a door panel, a base and hanger unit, a door support, a drive member and a motor. The door support is attached to the door panel and includes at least one roller which engages a hanger portion of the base and hanger unit for motion along the base and hanger unit. The hanger portion includes a longitudinal cavity and a slot communicating with the cavity. The drive member is disposed within the cavity and a drive member connector passes through the slot to connect the drive member to the door support.

Abstract: A window regulator for moving a pair of slidable window panes toward and away from one another utilizes three flexible, inextensible members such as cables to achieve a pull open/pull closed mode of operation of the slidable panes. First and second of the flexible members are attached to respective first and second pane carriers and to a drive drum, and the third flexible member connects the first and second pane carriers. The first and third flexible members are routed around pulleys located at outboard ends of a guide rail along which the pane carriers travel such that rotation of the drive drum in one direction pulls the panes toward an open position, and rotation of the drum in the opposite direction pulls the panes toward a closed position.

Abstract: A power drive system for driving the sliding rear windows in a pick-up truck includes a rack and pinion drive. In one embodiment, there are two sliding window portions, each associated with individual racks. Preferably, the single pinion drives both racks. In a second embodiment a single central window is utilized. Again, a rack and pinion preferably drives the window.

Abstract: A sliding door assembly for a clean room for manufacturing precision parts, chemicals and special foods or for carrying out surgical procedures. The door assembly includes a pair of parallel vertically spaced guide shafts which are inclined at an angle to a horizontal and serve to guide the sliding door as it moves from an upper open position into a closed lower position. A door closing and opening actuator includes an actuator shaft extending between the guide shafts. A sealing arrangement of the door assembly becomes operational upon movement of the sliding door to the closed position.

Abstract: A safety fence for a square hatched formed in a slab of a building is provided. The fence has lids pivotable about opposed sides of the hatch, and has such a size that about half of the opening of the hatch is closed by each of the lids. Side frames having a predetermined height are pivotable about opposed sides of the hatch. A plurality of gear mechanisms is provided, with each mechanism comprising a first gear and a second gear in mesh with each other, a first shaft supporting the first gear, a second shaft supporting the second gear, the first and second shafts extending parallel to the opposed ends of the hatch, the first gears being secured to lower ends of the lids, and counterweights mounted to one of the second shafts. The safety fence is set up by erecting the lids and the side frames. A plurality of brackets each having a pair of bracket portions secured to the inner wall of the hatch.

Abstract: The present invention is a bi-parting door system for transit vehicles. It has two doors mounted for movement in opposite directions and a motor for opening and closing them. It has at least one lock having a lock member for locking the doors in a closed position. The lock member is biased toward the locking position and moveable to an unlocking position by an actuator controlled by a control system which also controls the motor. When the doors are closed they experience a biasing force tending to open them and this biasing force is reacted by the lock member to generate a load on the lock member which prevents it from moving as a result of a spurious signal to the actuator. Unlocking of the doors requires a door closing signal to be received by the motor to remove the load from the lock member, as well as an unlocking signal to the actuator. Hence, the doors cannot be opened by any one spurious signal to either the motor or to the actuator.

Abstract: A revolving door has at least one night closing panel that runs concentric to at least one barrel-type wall. The night closing panel or panels slide or roll on a guide rail which is located on the ceiling structure or on attachments to the ceiling structure. The night closing panels can be moved with respect to the barrel-type wall by at least one flexible, endless tension or motive device. The flexible tension device is located in a runner, whereby the two strands of the flexible tension device are restrictively guided one above the other in the runner.

Abstract: A single linear motor has two sets of active sides with windings, secondaries and backirons. The front of the motor drives one load and the rear of the motor selectively drives another load. The windings on the two sides may have their phases reversed so as to drive the load in opposite directions in response to the same three-phase, U, V, W drive signals; or, only one load need be drive at any one time. The loads may be double, center-opening or two-speed elevator doors.

Abstract: A powered operator for sliding plug doors mounted on a movable carriage mounted overhead of an opening in the side wall of a transit vehicle, said doors including a single electric prime mover driving dual helical drives, each operating a door hanger attached to a single door panel over and away from said opening and for moving said carriage out of said side wall pocket. Door hangers used provide controlled deflection of door panels when in a fully open position. Drive linkages lock door panels when in a plugged position. The operator also provides guidance for the lower edge of said door panels during plugging and unplugging operations. Control elements and a central controller provides sequential door panel movement into and out of a pocket in the transit car side wall.

Abstract: An electronic motor drive produces a required motion profile for an elevator door operator actuated by a three-phase, line-powered linear induction motor (LIM) by means of an array of TRIAC switches producing selected forces from the LIM. The TRIAC drive is capable of producing acceleration, deceleration or free coast in either the open or close direction of door operation. When controlled by an algorithm such as a "time-optimal switch point" or "bang-bang" control, the TRIAC drive produces the required motions from the linear induction motor for elevator door operation. The motor windings may be switchable between delta and wye hookups to provide two distinct thrust levels. Phase angle modulation may be used to provide finer control of thrust.