Abstract: In an apparatus for storing and automatically delivering cassette and/or pallets containing cassettes to a reader. The apparatus includes a plurality of cassette retaining sites. A door assembly is provided adjacent the portal for allowing access to the plurality of cassette retaining sites. The door assembly has at least one door slideably mounted to the apparatus for movement between a closed position and an open position. A door safety system is provided.

Abstract: A vehicle-mounted motor drive apparatus which stops the rotation of a motor immediately after an object obstructs a movable part driven by the motor. The drive apparatus includes a motor drive device for selectively driving and stopping a motor, an electric current measuring device for measuring a value of electric current flowing through the motor, a change-in-current-value detecting device for detecting an incremental change in the motor current, and a motor control device for supplying a first control signal or a second control signal to the motor drive device. The motor drive device continuously drives the motor according to the polarity of the detected increment of the current value in response to the first control signal, and immediately stops driving the motor in response to the second control signal.

Abstract: The invention relates to an apparatus for interrupting the closing operation of an electric motor driven movable closing element, such as a vehicle sunroof when an obstacle which obstructs the closing operation is detected. A pressure-sensitive sensor strip is arranged on the closing edge of the moved closing part and the sensor signal is transmitted in accordance with the transponder principle by an attenuation modulation of an electromagnetic alternating field. The wireless sensor signal which is thus transmitted controls the control device for the electric drive of the closing part. When an obstacle is detected, the drive is switched off or reversed, depending on the sensed pressure applied to the sensor strip. The sensor strip is preferably implemented by a resistive foil pressure sensor.

Abstract: A sliding door system employs an electric power link. The electric link includes a ribbon conductor which is enclosed in a protective chain-like guard to provide electrical communication between the sliding door and the door header. Electrical modules such as electromagnetic locks, switches and sensors are mounted directly on the sliding door. Safety sensors are mounted at the leading and trailing edges of the sliding door panels to sense whether an obstacle or traffic has cleared.

Abstract: This device comprises mechanical link including a pawl (25) establishing a rigid drive link between a driving input member (2) and an output member (22), interacting with a prestressed element (31) which tends to hold the pawl in connection with the driving input member or with the driven output member, for so long as the force transmitted by the pawl remains below a predetermined value; this system automatically interrupts the kinematic drive chain of the movable member in the case of a force exceeding a predetermined value. This arrangement makes the device practically insensitive to friction and eliminates the uncertainty on the threshold of the triggering force.

Abstract: An automatic door assembly has a closure or door which is driven across a portal by an operator with automatic control. An extruded plastic retainer strip is screwed to the leading edge of the door. The retainer has two inwardly angled tabs which engage with a safety edge gasket assembly in snap-fit relation. The gasket assembly has an extruded resilient plastic gasket assembly with two legs which are engaged within a generally rigid extruded PVC base. A pneumatic sensing tube is supported on a single rib within the gasket assembly. The tube is connected to a conventional treadle sensor which has a switch responsive to deflection of a diaphragm to signal the door controller to reverse direction of the door when an obstacle is encountered by deflection of the gasket and the attached sensing tube. The safety edge assembly when used with bi-part or overhead doors also serves as a gasket to prevent air or other infiltration past the closure.

Abstract: A garage door operator which senses obstructions and takes corrective action before entrapment can occur. Yieldable gears are utilized as a failsafe mechanism such that when the applied torque exceeds certain limit, the gears disengage so that the garage door can be manually moved. The yieldable gears may also be disengaged by remote control or by hand. Solid state circuitry is provided to achieve soft starts and stops of the electric motor. Test circuitry is provided that tests the operational readiness of the electrical components by simulating an abnormal torque condition. During operation of the electric motor, the torque load is electronically calculated and if an abnormal torque load is encountered, the electric motor reverses direction.

Abstract: Horizontally hinged covers for use in ceiling/floors are provided which are highly fire resistant and which in the event of fire automatically close. The door preferably utilizes a multi-layer construction comprising an intumescent lower (inner) layer, an intermediate structural layer and a top (outer) layer of a cementitious material. The horizontally hinged door utilizes an automatic closing system in the event of fire comprising a fusible link which activates a pressurized gas source to close the door and which pressurized gas source is automatically purged when the door is closed to prevent explosion of the pressurized gas source. The fusible link also actuates (opens) a hydraulic valve to allow the flow of hydraulic fluid from a pneumatic/hydraulic housing which is used with a movable rod to open and close the door.

Abstract: A reversing mechanism for an overhead door opener is described. The reversing mechanism includes a channel-form trolley track. A centrally positioned longitudinal slot extends for the length of a bottom of the trolley track. Side openings are provided at a first end and the second end of the trolley track. A trolley plate is positioned in the trolley track with a control arm edge extending through the slot. A chain/cable return guide having an axial chain/cable receiving passage is secured to one of the opposed faces of the trolley plate. Channel engaging guide blocks project from opposed faces of the trolley plate to engage a top and the bottom of the trolley track thereby preventing the trolley plate from being withdrawn through the slot. A chain/cable is extended through the axial chain/cable receiving passage of the chain/cable return guide, looped into the trolley track from the first end and the second end and secured to the trolley plate.

Abstract: The invention relates to a motor-driven roller blind comprising, on the one hand, an apron rolling up onto and unrolling from a winding shaft inside which is accommodated a tubular-type driving gear-motor and, on the other hand, means providing an electrical signal representative of the movement of the apron and an electrical-signal processing unit capable of acting on the running of the driving gear-motor, viz. to control the stopping of same in the event an obstacle is present. As a matter of fact, said means providing an electrical signal representative of the movement of the apron are comprised of at least one inductive sensor extending at least partly along the path followed by the apron, this inductive sensor being capable of creating an electromotive force under the action of the passing of a permanent magnet associated with the lower portion of the apron, which electromotive force is detected by the processing unit.

Abstract: This invention prevents a power window from trapping a hand or the like during manual opening and closing of the window as well as during automatic opening and closing of the window. A current-flowing unit 56 flows a current in a closing direction in a power window motor 58 by turning on a sub-switch 57 for a passenger's seat window. While a catching detector 61 generates a detecting signal when an obstacle is present, a breaker 63 breaks a current flowing in a closing direction in the motor 58 through the unit 56 by turning off a master switch 39 for the passenger's seat. A reversing unit 65 rotates the motor 58 in a reverse direction by flowing a current in an opening direction in the motor 58. Even if an obstacle is present during an operation of closing the manual sub-switch 57, it is possible to release window, thereby freeing the obstacle.

Abstract: A passenger van tailgate hinged for swinging movement about a horizontal axis at its upper edge is forced upward to open by a pair of spring devices under the control of a powered actuator operating through cables. The actuator is mounted on the tailgate and includes an electric motor drivingly connected by a worm shaft and worm gear and additional reduction gearing to a pulley on which the cables are wound. The cables are secured at one end to the vehicle structure, extend along side the respective spring devices, and are wound at their other end in the same direction on the pulley. The tailgate is opened by operating the actuator motor to unwind the cables and allow the spring devices to open the tailgate at a rate determined by the speed of the motor. The tailgate is closed by operating the actuator motor in reverse to rewind the cables and compress the spring devices.

Abstract: A control system for use with a bidirectional motor connected to a motorized vehicle accessory to move the accessory a distance from a first position to a second position. The control system includes a detector responsive to control signals emitted from the motor during rotation, where the control signals indicate the amount of motor rotation. The control system also includes a memory that stores information used to represent the position of the accessory. Additionally, this control system includes a controller responsive to the memory and the detector. The controller provides an output signal to operate the motor based on the distance between a first position and a second position of the accessory as well as control signals that indicate the amount of motor rotation. The controller includes an adjustment routine that determines a correction factor that is applied to the output signal to compensate for inaccuracies in control signal detection.

Abstract: An apparatus for driving and controlling a motor which moves a movable portion of a vehicle by driving force of the motor. The apparatus includes a drive stopping circuit for comparing a value of current detected by a current detection circuit, which detects drive current of the motor when the movable portion is being moved, with a predetermined comparison current value, and for stopping driving of the motor at a time when a detected current value exceeds the comparison current value. The apparatus also includes a comparison current varying circuit for varying the comparison current value based on a temperature of an environment of the movable portion. Since it is possible to carry out temperature compensation based on ordinary drive current and lock current of the motor, the comparison current value can be set within a wide range.

Abstract: This safety device for electric window lifters of the Bowden cable (3) type comprises electromechanical means for detecting and measuring the force exerted on the cable (3); a compression spring (11), housed in a sheath (9) coaxial to the cable (3) bears, on the one hand, on a stationary support (8) and, on the other hand, on a tubular component (12) mounted so as to slide inside the sheath (9) and carrying a tab (13) which interacts with an electric switch (14) forming part of an electric circuit for controlling the motor capable of automatically reversing the direction of rotation of the motor when the force (F) exerted on the window and the cable (3) gives rise to a movement of the tubular component (12), which opens the switch (14). This electromechanical safety device is of simple and inexpensive construction.

Abstract: A safety device for electric glass-winders of the cable type employs a guide rail movably mounted on the door panel of a vehicle so as to be capable of being driven downwardly in vertical translation by the cable upon encountering a force opposing travel of the glass which exceeds a predetermined value. The rail is maintained in its normal position by, for example, a magnet which attracts a tab of ferromagnetic material fixed to the rail. A switch forming part of the electrical supply circuit for the winder motor cooperates with the rail and reverses the direction of rotation of the motor when the rail is displaced from its normal position to a lower position. The electromechanical safety device is inexpensive and simple to manufacture.

Abstract: In a window lifter of the cable type, comprising a motor for driving the cable bearing a slide (6) linked to a second slide (7) supporting the window, the two slides (6, 7) may be coupled via an elastic tension element (16) and one (6) of the slides is fitted with an electrical switch (17), associated with the second slide (7) so as to change state when the load on the slide (7) carrying the window (8) exceeds a predetermined value and when the elastic element (16) undergoes an extension corresponding to the separation between the slides; the switch (17) forms part of an electrical supply circuit for the motor, capable of reversing its direction of rotation when this switch (17) changes state, so as to free the movable member from an obstacle in its path. This electromechanical safety device has a simple structure and a low manufacturing cost.

Abstract: Power-operated closing devices, particularly electrically operated windows and sunroofs of motor vehicles, have two electrical conductors being spaced apart from each other for disengaging a switching process of a drive unit when brought into contact. For the purposes of simple manufacture and reliable contact-making, a trapping protector is provided, which includes a flexible hollow profile made of an elastomer or plastic material having a flat base area and a mounted arched profile area enclosing a hollow chamber. The base area and a zenith area of the arched profile area include conductive material and are separated from each other by insulating profile areas.

Abstract: A centrifuge for dewatering a fluent aggregate material such as sand. Sand slurry is conducted into a rotating cylindrical drum which has a perforated lateral wall against which a screen is placed. The drum is oriented with the axis disposed vertically. When the centrifuge operates, centrifugal action slings slurry poured into the drum outwardly. Upon contacting the lateral wall, the slurry builds up. When a certain quantity of the slurry has built up at the bottom or floor of the cylinder, additional material cannot resist migrating upwardly. Thickness of the trapped layer varies, being greater at the floor, near the source of the incoming slurry. This trapped layer forms a bed having an inclined wall. Thickness of the bed at the top of the cylinder is determined by a circumferential, inwardly projecting flange or dam located at the top of the cylindrical drum. The sand bed protects metal parts of the centrifuge from abrasion, and also enables water to diffuse therethrough.

Abstract: A method for operating power window apparatus with a safety device which stops the closing operation of the window in response to the detection of an object-caught state, which prevents the incomplete close of the window, and can accurately detect the object-caught state. The opening/closing position of the window is detected by counting pulses generated as the window moves. A region where a safety control can be carried out is determined on the basis of the detected opening/closing position. When the window reaches a position near a position where the window is fully closed, the count indicative of the opening/closing position detector is reset. The resetting operation is carried out so that a time point where the relative speed of the window is reduced is set at the fully closed position of the window.

Abstract: A cash pocket for an automatic teller machine (ATM) comprises a housing having a rear wall with a slot for receiving banknotes from the dispensing mechanism of the ATM into the housing, and a base upon which the dispensed banknotes come to lie upon being dispensed into the housing. The housing also has a front panel having an opening for the withdrawal of notes by a user of the ATM, the opening having a door which pivots about an axis substantially parallel to the longitudinal axis of the slot from a first position in which the front opening is closed to a second position in which the front opening is open for the withdrawal of dispensed banknotes. The door includes a pair of flanges which block access to the slot from the front opening when the door is open or partially open.

Abstract: A tailgate is hinged to a passenger van type vehicle body above a substantially vertical rear access opening for swinging movement about a horizontal hinge axis. The tailgate is counterbalanced through its range of movement by spring devices and is opened and closed by a powered actuator mounted on a rear vehicle body pillar. The actuator includes a reversible electric motor driving a worm shaft that drives a worm gear to pivot a crankarm about an axis parallel to the hinge axis. A roller mounted on the crankarm is received in a guide channel that is fixed to the tailgate and extends at right angles to the hinge axis with the pivoting movement of the crankarm thereby translated into swinging tailgate opening and closing movement. The motor is connected with torque sensing circuitry that detects an excessive motor torque demand when the tailgate encounters an obstacle and stops the motor.

Abstract: A safety edge assembly, for a movable closure such as a garage door, automatically reverses the direction of travel of the door when the door encounters an obstruction. The safety edge assembly includes an electrically conductive mounting rail fixed to the door, and a deformable tubular member supported on the mounting rail. A conductive member on the tubular member is movable, upon deformation of the tubular member, from a first position normally spaced from the conductive mounting rail into a second position in engagement with the conductive mounting rail to complete an electrical circuit for controlling the direction of movement of the door. An end plug for closing the open end of the tubular member has a nonconductive portion for insertion between the end of the conductive member, which may fray or otherwise move out of position while being cut to length in the field, and the end of the conductive mounting rail to provide electrical insulation therebetween.

Abstract: A power window system employs a computer based control that receives signals from a window position sensor. As the window moves, the position sensor produces periodic signals as an output. The computer cyclically looks for a change in the frequency of the signals as an indication that the window is obstructed and decelerating. Based on the instantaneous deceleration, the computer recalls a stored value for motor force. The recalled forces are accumulated in synchronism with the position sensor output during the deceleration, manifesting the force applied to the obstruction as the window presses on it. The window is reversed when the accumulated force exceeds a stored value. The uppermost window position is a stored value for the position sensor output obtained when the window is closed for the first time. Each time the window is closed thereafter, an offset is added to that value, the sum defining the point at which the window engages the window seal.

Abstract: The light beam in an obstruction detector is coded into packets of pulses by a transmitter according to a code generated only by the transmitter. When the light beam is received, the receiver recovers the code signal and supplies it to a code detection circuit. In one preferred embodiment, to detect the code, the code detection circuit supplies the code signal and a delayed version of the code signal to an "exclusive or" gate. In another embodiment, a frequency detection circuit determines whether the code signal detected by the receiver is within a predetermined permissible range. If the code is not present, the door operator system reverses the door if it is closing, and prevents the door from closing if it already is in the up position, or if it is opening. The door operator system will operate in this way not only in response to obstructions, but also, in response to errors and malfunctions in the wiring to the transmitter and receiver, and in the transmitter and receiver themselves.

Abstract: A swinging door operating mechanism includes a hydraulic cylinder having a piston coupled to the door to open the door with the piston advance, opposite ends of the cylinder being connected through a solenoid actuated four way reversing valve to the input and output respectively of an electric motor driven hydraulic pump. A pressure responsive switch is exposed to the hydraulic fluid delivered to the door opening end of the cylinder and is actuated when the pressure exceeds an adjustable value to deenergize the pump motor and switch the advancing end of the cylinder to the pump inlet. The door opening cycle is initiated by the momentary local or remote closing of a start switch. The cylinder piston is connected to the door by a one way advancing linear to rotary motion coupling.

Abstract: A power window apparatus for carrying out a safety control operation when an object is caught in the window, which apparatus is capable of setting a safety control mode disabling region to within the required distance exactly. The power window apparatus includes a motor rotation sensor for sensing a state of rotation of the motor, and a window movement sensor for sensing the amount of movement of the window. The object-caught state is detected on the basis of the rotational rate of the motor, and the absolute position of the window is detected on the basis of the detected amount of movement of the window. The safety control mode is disabled in response to the detected absolute position of the window. A reference value for detecting the object-caught state may be varied as the window approaches its fully closed position.

Abstract: A sensing device for use with a door movable in a first direction by an actuator is employed to stop or reverse the direction of movement of the door upon a force being applied to the sensing device by an object in the path of movement of the door. The sensing device comprises a sensing edge for being secured to the door. The sensing edge includes a generally flexible elongated sheath and a pair of generally parallel spaced contact members disposed within the sheath. The contact members are electrically connected to the actuator. A termination circuit is electrically connected to the contact members for generally continuously generating an installer selected predetermined output which is applied through the contact members to the actuator to enable operation of the actuator for movement of the door in the first direction.

Abstract: A door operation control system has a door opening for moving a door between open and closed positions. A door operator control circuit selectively operates the drive means to move the door between the open and closed positions. An obstruction detection device detects whether there is an obstruction in the path of the door between the open and closed positions and generates a signal in response thereto. The obstruction detection device is connected to the control circuit by wiring to permit operation of the door opener in the absence of a signal from the obstruction detection device and to prevent certain operations of the door opener in the presence of a signal from the obstruction detection device. An error detection circuit detects faults or errors in the wiring and generates a signal to prevent certain operations of the door operator when the faults or errors are detected.

Abstract: A power window apparatus with a safety device capable of taking a safety measure when it detects the neck or hand of a passenger being caught in the window, which device can exactly detect such a dangerous state and take a reliable safety measure to correct for the same, irrespective of variations of ambient temperature. A temperature sensor provided which senses the temperature of the motor acting as a drive source for moving the window. This temperature is closely related to the ambient temperature. A reference value for the motor speed for detecting an object-caught state is altered according to the detected temperature, thereby providing exact detection of the object-caught state irrespective of temperature variations. Preferably, the power transmission for the window, the temperature sensor, and a controller structure are mounted on an inner side of a single housing.

Abstract: An automatically actuated door arrangement is provided. The arrangement includes a plurality of slidable doors which are opened and closed by an electric motor/cable arrangement. Open and close switches control the opening and closing of the doors. A sensor device provides the open doors/close doors signals to the controller, and eventually to the motor. The motor is connected to the cable drive by a clutch arrangement which allows slippage should the movement of the doors become obstructed. The door travel path may be arranged in a slight V-shape, to allow for more efficient sealing of the door bottoms. A controller is provided to receive, process, and distribute electronic signals for controlling the extent of the door opening, the speed of opening and closing, and other operating parameters. The controller includes a series of indicators for monitoring the status of the door arrangement, and also includes inputs for altering the operating parameters of the door arrangement.

Abstract: A power operated door which fits into a wall opening with an outer surface flush with the outer wall surface and displaceable upwardly to a horizontal open position by tilting the top of the door inwardly and then sliding it in vertical and horizontal tracks to the open position. A first drive mechanism on the door tilts it about a lower bearing and a second drive mechanism drives the door upwardly and downwardly by means of flexible connectors which pull upwardly and downwardly on the bottom of the door.

Abstract: A sensing edge for a gate to protect persons, equipment and the gate from impact damage. The sensing edge includes a mounting member which is snap-fit to the leading member of the gate and extends around a portion of the external surface of the leading member of the gate. An elongate outer sheath surrounds the mounting member and a switch is positioned between the sheath and mounting member for actuation of the device upon application of pressure to the exterior surface of the sheath. The sensing edge extends sufficiently around the leading and side edges of the leading member to permit the device to be actuated in response to forces which approach the leading member at an angle.

Abstract: A safety gate assembly is provided for use at a loading dock to prevent accidental or inadvertent movement of a loading dock vehicle through an access passageway provided on the loading dock. The assembly includes a pair of laterally spaced, upright, stationary support members positioned on opposite sides of the passageway and a housing removably mounted on one support member. An elongate gate segment is hingedly connected to the housing for movement between operative passageway-blocking and inoperative passageway-unblocking modes. When in the operative mode, the gate segment spans the distance between the support members. Movement of the gate segment is effected by a motor driven element connected to the segment and disposed within the housing. A stop is mounted for engaging the gate segment only when the latter is in the operative mode.

Abstract: A safety edge switch which may be utilized to sense an obstruction present in a window opening upon closure of the respective window of an automotive vehicle. The switch may be secured to a window opening by adhesive attachment. The switch includes an outer peripheral portion preferably shaped as an oval and constructed of a resilient material which defines a central aperture. A second smaller structure constructed of conductive elastomer is located in the central aperture and secured to an internal wall thereof. A portion of the outer peripheral member opposite the second smaller oval shaped structure features a conductive elastomeric portion extending parallel thereto and maintained separate therefrom by the resilient physical properties of the outer peripheral portion.

Abstract: A system for detecting objects in the path of a power operated, movable door operating in a mass transit vehicle, which would obstruct door closing. The system also includes an integral method for detection of a "free wheeling" door occasioned by failure of the door mechanical drive. Method and apparatus disclosed utilize door handle locating devices such as electrical switches located at predetermined points along the door closure track. A combination of door locations along the closure track centrally define positions signaling either door linkage failure with attendant "free wheeling" door, and/or door obstruction, in each case, the system disclosed prevents train motion until the improper door condition is remedied. The combination provides a reduction in passenger hazards occasioned by train movement with defective operator linkage and/or door obstruction due to trapped passengers or other impediments to door closure.

Abstract: A safety top modular door closure system is provided for a vapor degreaser and consists of a mechanism for mounting an open bottom of an enclosure to a top access area of a solvent fluid holding tank of the vapor degreaser. A horizontal sliding double door assembly is affixed to an open top of the enclosure and structure is available for operating the horizontal sliding double door assembly. The horizontal sliding double door assembly can go from a closed position into an open position to allow the insertion of articles therethrough into the tank of the vapor degreaser and from the open position back to the closed position to significantly reduce solvent vapor emissions from the tank of the vapor degreaser.

Abstract: A door operator for a reversibly operable door includes a frame and a carriage movably mounted on the frame and attached to a door for moving the door between open and closed positions. A drive member, specifically a roller chain, extends along the frame and moves the carriage. A drive train is provided within a housing and is connected for moving the drive member, and a control circuit is provided for controlling the drive train to open and close the door. A pair of limit switches is mounted within the housing and connected to the control circuit for stopping the drive train when the door has reached a completed position. A pair of limit cams are adjustably mounted on a limit wheel within the housing and separate from the carriage for engaging the limit switches. The limit wheel, which is separate from the drive member, is connected to the drive train to rotate when the drive train moves the carriage.

Abstract: A revolving door with a passage space (3) enclosed by a housing (1) in which the door panels (4) are mounted onto a central rotatable support (5). One or more sensors (6) are present which, at the presence of an object within a certain distance of a door panel (4) may emit a signal. The signal serves to actuate a controlling device so as to operate the drive of the revolving door.

Abstract: A gate opening and closing apparatus for moving a gate between a gate closed position which covers an access opening and a gate opened position. The apparatus comprises an electric motor for driving the gate between the open position and the closed position. A connecting arrangement connects the electric motor to the gate in order to enable powered movement of the gate between the gate opened and gate closed positions. A control unit in the form of a microprocessor control unit is operatively connected to the electric motor for control of the same and hence control of the movement of the gate. The gate normally remains unlocked at the closed position and is only locked when a force is applied to the gate tending to move same to the open position. In one embodiment, a positive locking mechanism, such as a solenoid lock may be provided and which is automatically locked when an opening force is applied to the gate.

Abstract: A symmetrical cell door and operating system comprises a vertically shiftable locking bar mounted in a center column of a cell opening. A cell door is movable in either direction relative to the central column and has upwardly facing locking notches in a lower horizontal frame element to receive the lower end of the locking bar to lock the cell door when moved either to the extreme right or to the extreme left of the center column. An elongated rack is secured to the top of the cell door by a lost motion connection and defines a cam slot engagable with a horizontally projecting actuator on the locking rod to cam the locking bar into and out of the respective locking notch. The rack is reciprocated by a pinion driven by a DC motor.

Abstract: A safety arrangement for a motor-driven door or gate used to close building ntrances or doorways, in which a vertically movable overhead door consists of one part or a multiple number of parts. An elastically deformable hollow rubber section is provided at the closing edge of the door, and this hollow rubber section has an interior hollow space with first and second ends. At the first end of this hollow space, there is an air pressure-wave receiver signal transformer, whereas an air pressure-wave transmitter is connected to the second end. This transmitter generates a continuous air pressure oscillation having a first pulse duration and a first pulse frequency when the closing edge is freely movable through a path of motion of the door. The continuous oscillation has a second pulse duration which differs from the first pulse duration, and a second pulse frequency differing from the first pulse frequency when the closing edge strikes against an object positioned in the path of motion of the door.

Abstract: Safety device for motorized rolling shutter comprising a generator of a signal representing the displacement of the rolling shutter and a logic processing unit (10) capable of working in learning mode and in operating mode for recording and processing signal samples and for comparing the values obtained in operating mode with the values obtained in learning mode in order to control the stopping of the motor (5) of the rolling shutter when there is an obstacle and for providing, if necessary, other functions such as the automatic stopping in the high position and in the low position, or the triggering of an alarm. The generator comprises a pulley on which is wound a flexible element (9) whose other end is connected to the end (8) of the rolling shutter, such that the unrolling of the rolling shutter (1) drives the pulley whose axis is mechanically connected to a signal generator, for example a synchronous motor.

Abstract: An electric operator for a sliding door mounted for sliding movement along a track, comprising a motor having an iron cooling flywheel disposed on a drive shaft thereof, the flywheel being provided for imparting a predetermined amount of inertia for starting and stopping of the motor such that the operation of the motor is characterized by a soft start and stop. A worm gear reducer is connected to the drive shaft for effecting a predetermined reduction ratio of rotation. A limit switch is coupled to the reducer for limiting rotation of the drive shaft to a predetermined number of rotations, and apparatus is provided for coupling rotation of the drive shaft to the linear movement of the sliding door along the track.

Abstract: A revolving door, particularly for the protection of the access to a room, comprises a rotating shaft, a number of door wings spaced around it and mounted thereto and a pair of opposite panels bordering the door wings and defining a partly closed zone with a first and a second opening. Further a drive motor for the shaft and a control unit for the drive motor are provided. The revolving door is provided with a detection means for detecting a person authorized or unauthorized to access the room, and a first sensor for detecting an unauthorized person entering the zone through the first or the second opening respectively. The control unit turns off the drive motor in response to the first sensor. A second sensor is adapted to detect the presence of an unauthorized person outside said zone in or close to the first or second opening respectively, wherein the control unit turns off the drive motor in response to said second sensor.

Abstract: A safety arrangement for an automatic door operator wherein the door edge has mounted thereon a stretched electrically conductive cable which, when deflected upon encountering an obstruction, will change the inductance of a loop of which the cable forms a part. A capacitor is in parallel with this loop so that the capacitor together with the inductance of the loop form a resonant tank circuit. The tank circuit is electrically driven by a voltage controlled oscillator. The phase of the loop current is compared with the phase of the voltage across the capacitor and the phase difference is utilized to control the voltage controlled oscillator to maintain the tank circuit in resonance (i.e, zero phase difference). The detection of a sudden change in phase difference, which occurs when the loop inductance is suddenly changed due to the encountering of an obstruction by the door edge, results in the generation of an obstruction signal for activating the safety feature of the door operator.

Abstract: A pneumatically-powered traffic control gate is disclosed. This gate contains a cylinder and piston for raising and lowering its gate arm, a means for adjusting the alignment of the traffic gate arm, a pneumatic means for sensing the presence of an obstruction to the movement of said traffic gate arm, and a means for reversing the movement of the piston and the gate once the obstruction has been sensed.

Abstract: A gate opening and closing apparatus for moving a gate between a gate closed position which covers an access opening and a gate opened position. The apparatus comprises an electric motor for driving the gate between the open position and the closed position. A connecting arrangement connects the electric motor to the gate in order to enable powered movement of the gate between the gate opened and gate closed positions. A control unit in the form of a microprocessor control unit is operatively connected to the electric motor for control of the same and hence control of the movement of the gate. The gate normally remains unlocked at the closed position and is only locked when a force is applied to the gate tending to move same to the open position. In one embodiment, a positive locking mechanism, such as a solenoid lock may be provided and which is automatically locked when an opening force is applied to the gate.

Abstract: An apparatus for controlling a power window capable of maintaining an energized state of the motor to move a window glass, detecting a locked-rotor current flowing through the motor when the window glass reaches a limit position, and de-energizing the motor to stop the movement of the window glass when the locked-rotor current becomes larger than a predetermined value. The period of time for energization of the motor is longer than a period of time from a moment at which the "ON" operation of the automatic mode switch is cancelled to a moment at which the window glass reaches the limit position. It is thereby possible to automatically de-energize the motor when the window glass reaches the limit position, even if the locked-rotor current does not become larger than the predetermined value at this time due to the influence of temperatures or other causes.

Abstract: An anti-jamming device for a security screen arrangement, in which a security screen is able to be rapidly fired from a rest position to an upper position at which passage of a person from one side of the screen to another is not possible, includes sensors for detecting whether the screen is at the rest position or the upper position. The device also includes a valve for lowering a screen when it does not reach the upper position, due to the screen having been jammed, and for reactivating the firing of the screen. The screen may be repeatedly fired until the obstruction is cleared.