Dual Control Circuits Alternately Energized Patents (Class 318/267)
  • Patent number: 10723549
    Abstract: Various trash can assemblies are disclosed. The trash can assembly can include a body and a lid that is movable between open and closed positions. The trash can assembly can be provided with a resistive load control system that controls the rate of movement of the lid from the open position toward the closed position and/or from the closed position toward the open position. The trash can assembly can be provided with an energy recapture system that translates mechanical energy into electrical energy through an electric generator. The electrical energy can be provided to other components of the trash can assembly, such as an ion generator that discharges ions into an interior of the trash can assembly to provide odor control.
    Type: Grant
    Filed: November 10, 2017
    Date of Patent: July 28, 2020
    Assignee: simplehuman, LLC
    Inventors: Frank Yang, David Wolbert, Guy Cohen, Phillip Yee, Teddy Bryant
  • Patent number: 10124878
    Abstract: A door arrangement for an aircraft interior and an aircraft with such door arrangement, including a frame portion and a door blade hinged to the frame portion and pivotable between a closed position, where the door blade closes a door opening, and an open position, where the door blade allows access. The door arrangement includes a lever arm and an actuator mounted to the frame portion and operable to selectively move the door blade between the open and closed positions via the lever arm engaging the door blade and the actuator. The actuator is movable into a first actuator position and into a second actuator position. The actuator is movable into the second actuator position such that the door blade is able to move from the closed position towards the open position independent of the actuator while the actuator remains in the second actuator position.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: November 13, 2018
    Assignee: Airbus Operations GmbH
    Inventor: Maik Buttelmann
  • Patent number: 9423867
    Abstract: A power supply control circuit includes: a power supply unit that outputs the DC voltage for the load operation; a first switch of which opening/closing is controlled by applying the DC voltage from the power supply unit; a second switch which is manually operated to switch over the power supply; and a control unit. The second switch achieves a first state when not manually operated, and achieves a second state when manually operated. The control unit closes the first switch, if the second switch is changed to the second state and thereafter changed to the first state, when the second switch is in the first state and the DC voltage output from the power supply unit is not less than a predetermined value.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: August 23, 2016
    Inventor: Takahiro Ushiro
  • Patent number: 9281769
    Abstract: A motor control circuit and associated techniques can drive an electric motor in a start-up mode of operation followed by a normal mode of operation. The motor control circuit and techniques can receive a selection signal provided by a user that can select one of a plurality of sets of parameter values that determine characteristics of drive signals applied to the motor during the start-up mode of operation. The motor control circuit and associated techniques can synchronize operation between the start-up mode of operation and the normal mode of operation.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: March 8, 2016
    Assignee: Allegro Microsystems, LLC
    Inventors: Timothy Reynolds, Chengyi Jin
  • Patent number: 9041323
    Abstract: An apparatus for controlling asymmetrical coasting of an endodontic reciprocating motor includes a controller operatively connected to the endodontic motor. The controller may include a processing unit that is configured to direct the rotation of the endodontic motor in the forward direction for a coast time and configured to direct the rotation of the endodontic motor in the reverse direction for a coast time. The forward coast time is separately calculated from the reverse coast time. A method for asymmetrically coasting a reciprocating endodontic motor includes rotating an endodontic motor in a forward direction and calculating a forward coast time for the forward direction and coasting the endodontic motor in the forward direction for the calculated forward coast time. After coasting the endodontic motor in the forward direction, the endodontic motor is rotated in a reverse direction. The reverse coast time is different than the forward coast time.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: May 26, 2015
    Assignee: Ormco Corporation
    Inventors: Erik Brown, Carlos Aloise, James Shipley, Gianluca Gambarini, Gary Glassman, Gary Garman
  • Patent number: 7931068
    Abstract: A motorized shade control system includes electronic drive units (EDUs) having programmable control units directing a motor to move an associated shade in response to command signals directed to the control units from wall-mounted keypad controllers or from alternate devices or control systems connected to a contact closure interface (CCI). Each of the EDUs, keypad controllers and CCIs of the system is connected to a common communication bus. The system provides for initiation of soft addressing of the system components from any keypad controller, CCI or EDU. The system also provides for setting of EDU limit positions and assignment of EDUs to keypad controllers from the keypad controllers or CCIs. The system may also include infrared receivers for receiving infrared command signals from an infrared transmitter.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: April 26, 2011
    Assignee: Lutron Electronics Co, Inc.
    Inventors: Lawrence R. Carmen, Jr., Michael E. Lockley, Justin J. Mierta, David J. Dolan, Stephen M. Ludwig, Jr., Thomas W. Brenner
  • Patent number: 7526371
    Abstract: The present invention concerns a method for the position-dependent control of a mobile element in a motor vehicle, wherein the element is movable in a drive movement by an electrically powered positioning device, wherein the positioning device has several different operational modes, and characteristics of a drive signal of the positing device, in particular a waviness of a drive current, are used for the determination of the position of the element. According to the invention, a characteristic variable, which influences the drive movement of the positioning device, and/or a specific value, which characterizes the positioning device, are evaluated for the determination of an error value of the determined position of the mobile element, and that the operating modes of the positioning device are controlled in dependence of the determined error value.
    Type: Grant
    Filed: June 10, 2005
    Date of Patent: April 28, 2009
    Assignees: Brose Fahrzeugteile GmbH & Co., Kommanditgesellschaft, Hallstadt
    Inventors: Jürgen Seeberger, Carsten Abert
  • Patent number: 7323842
    Abstract: A rotating electrical machine has a housing with a shaft mounted rotatably in it. A rotor is fixed to the shaft and has a plurality of magnetic poles. A stator is positioned about the rotor and has a winding. A switch is mounted within the housing and has a first position for allowing current in one direction through the winding and a second position for allowing current in an opposite direction through the winding. A mechanical activator is movable with or by the shaft and acts on the switch to move it between the first and second positions.
    Type: Grant
    Filed: November 27, 2003
    Date of Patent: January 29, 2008
    Assignee: Dolphin Electric Holdings, Inc.
    Inventors: Tony Elijah Muldowney-Colston, Thomas Mahon Shaw
  • Patent number: 7268511
    Abstract: A drive arrangement for positioning a positioning element is disclosed that includes an electric servo motor for driving the positioning element, a potentiometer for presetting a setpoint, an actual value sensor disposed at the servo motor, and a motor driver with an integrated evaluation and control unit comparing the setpoint and actual value, whereby a pulse-shaped signal is superposed on the setpoint and the pulse-shaped signal exceeds the motor driver hysteresis in the evaluation and control unit.
    Type: Grant
    Filed: June 5, 2006
    Date of Patent: September 11, 2007
    Assignee: PREH GmbH
    Inventors: Harald Ment, Markus Peschel
  • Patent number: 7154377
    Abstract: In a movable barrier operator, data that corresponds to force requirements to effect desired movement of a movable barrier is compressed and stored for later retrieval. Multiple compression schemes and/or compression rates can be made available. Selection of a given scheme or rate can be determined on a user-directed or an automatic basis. Automatic selection in turn can be based on various criteria including, for example, presently available memory resources.
    Type: Grant
    Filed: December 30, 2003
    Date of Patent: December 26, 2006
    Assignee: The Chamberlain Group, Inc.
    Inventor: Eric Gregori
  • Patent number: 6674255
    Abstract: An improved window covering and lighting system for a window in a room includes a plurality of cornices, each cornice including a window covering supported by the cornice and movable between an open position and a closed position, an actuator supported by the cornice for moving the window covering between the open position and the closed position, a lighting system mounted to the cornice, and a programmable logic unit for operating at least one of the actuator and the lighting system independently from one another upon demand. The system also includes a remote control unit providing a signal selectively to the programmable logic unit to operate at least one of the plurality of cornices. Each of the plurality of cornices further includes a light sensor for sensing ambient light conditions in the room, and a motion detector for detecting occupance of the room. The programmable logic control unit is responsive to the sensed ambient light conditions and the detected occupance.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: January 6, 2004
    Assignee: Decotex 2000 Corporation
    Inventors: John T. Schnebly, Kevin C. Martin, Randy Koleda, Leo Litto
  • Patent number: 6483267
    Abstract: A auxiliary vehicular window recessing system for providing a secondary means of recessing the electrically-controlled windows of a vehicle in the event of submergence in a body of water. The auxiliary vehicular window recessing system includes a secondary motor for moving the window of the vehicle. A secondary gear member driven by the secondary motor is engaged with the main drive gear such that rotary motion of the secondary gear member biases the primary window drive system thereby recessing the window when the secondary motor is activated. An auxiliary, waterproof battery provides power, while a sealed fuse electrically protects the secondary motor. Optionally or in conjunction, a manual crank apparatus engages the primary window drive system for manually recessing the window.
    Type: Grant
    Filed: September 27, 2001
    Date of Patent: November 19, 2002
    Inventor: John K. Jurney
  • Patent number: 6433500
    Abstract: An apparatus (10) for detecting a window open condition comprises a first photoelectric cell (60) mountable to the window (20) for providing a reference output signal (61) independent of the window open condition. The apparatus (10) also comprises a second photoelectric cell (62) mountable to the window and providing a signal (63) having a first characteristic if the window (20) is open and a second characteristic if the window is not open. The apparatus (10) further comprises comparison means (82) for comparing the reference output signal (61) with the signal from the second photoelectric cell (63). The comparison is indicative of the open condition of the window. The apparatus (10) comprises means (88) responsive to the comparison means (82) for indicating if the vehicle window (20) is in the open condition.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: August 13, 2002
    Assignee: TRW Inc.
    Inventor: Albert DeBoni
  • Patent number: 6366040
    Abstract: An apparatus 10 for controllably moving a vehicle window, which is deployed upon a vehicle 12 of the type having a cab 14 including a rear or “backlight” window 16. Apparatus 10 includes a conventional controller 22 having a memory unit 24, a conventional window actuating motor 26, which is operatively coupled to window 16 and to controller 22, and a user operated switch 28, which is coupled to controller 22. Controller 22 receives signals from switch 28 and utilizes the received signals, in combination with data describing the current state/position of the ignition switch 36 and of motor 26, to selectively provide commands to motor 26, thereby selectively and controllably moving and/or positioning window 16.
    Type: Grant
    Filed: December 20, 1999
    Date of Patent: April 2, 2002
    Assignee: Ford Global Tech., Inc.
    Inventors: Brian M. McLennan, David J. Jaworski, Gwen L. Woods, Robin Lynn Rivard, Steven M Sundberg, Scott W. Westermann, Fred Lupton
  • Patent number: 6246194
    Abstract: A method and system for directly determining the presence of an object between a window and its respective frame during closing of the window is disclosed. A sensor is provided within the frame to determine a length of the frame being compressed when the window is closed against the frame. This length is compared to a predetermined value. If the compressed length is less than the predetermined value, an object is detected so that the window can be controlled to stop and change direction so as to release the object before injury or damage occurs.
    Type: Grant
    Filed: September 7, 1999
    Date of Patent: June 12, 2001
    Assignee: Meritor Light Vehicle Systems, Inc.
    Inventors: Timothy Davies, Charles Hopson, Christos Kyrtsos, Joseph Tyckowski, Francois Breynaert, Pascal Bonduel
  • Patent number: 6211637
    Abstract: Soiled and/or contaminated objects often have to be collected before they are specifically disposed of. According to the invention, in order to prevent blockages in toilets and sewers, a contactlessly operating container (1) is used which has a lid (2) which opens when a hand or an object approaches a proximity detector (50). The container (1) is suspendable from a supporting housing (12) accommodating the entire control means, the drive and the power supply. A preferred use of the device is the disposal of sanitary towels (14) which are immersed in a gel (15). The container (1) is periodically replaced by a clean container so that satisfactory hygiene conditions can also be maintained in frequently used toilet areas.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: April 3, 2001
    Inventor: Hans-Jörg Studer
  • Patent number: 6111373
    Abstract: A power window apparatus for a vehicle, which can open or close a door window by manual operation of a power window switch for energizing either of window-opening and closing relays for rotating a motor in the forward or reverse direction or by automatic operation of the same switch to cause an auto-latching circuit or a control unit to maintain either of the relays in an energized state until the window becomes fully opened or closed. The apparatus is provided with a switch for deenergizing a coil of the window-closing relay by disconnecting the control circuit for latching the energized window-closing relay, thus enabling the opening of the window by manual switch operation whenever an abnormal operation of the auto-latch control system occurs with simultaneous energization of both the window-opening and closing relays in an accident such as the vehicle sinking into water.
    Type: Grant
    Filed: August 18, 1998
    Date of Patent: August 29, 2000
    Assignee: Toyo Denso Kabushiki Kaisha
    Inventor: Nobuaki Ohashi
  • Patent number: 6049748
    Abstract: An electronic control system is an in-line module for addition to or partial replacement of automotive vehicle seat control systems for providing massage and improved features of functional control, especially human lumbar massage and diagnostics. The module provides the following improved functions and features: an enhanced driver for automatic lumbar massage, or user taught lumbar massage cycle, and a transparency simulator for low power standby operation, motor stall protection, open motor circuit detection, short motor circuit protection, motor low current protection, motor over current protection, seat position sensor malfunction detection, electrical motor noise attenuation, electrical noise filtering, and also other options. These improvements do not require alternative wiring harness changes and do not affect existing operations of a memory or non-memory seat control mechanism.
    Type: Grant
    Filed: September 18, 1997
    Date of Patent: April 11, 2000
    Assignee: Nartron Corporation
    Inventors: Todd Newman, David Shank, John Washeleski
  • Patent number: 5455494
    Abstract: A method and device for controlling a lumbar support device, wherein a motor is controlled its drive under a repeated reversal drive operation to provide a fore-and-aft reciprocation of a lumbar plate within a predetermined operation time in a periodic way, so as to provide a massage effect to the lumbar part of an occupant on the seat. A manual control mode for giving a static lumbar support and in addition thereto, an automatic control mode for giving a dynamic lumbar support to the occupant's lumbar part.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: October 3, 1995
    Assignee: Tachi-S Co., Ltd.
    Inventor: Hiromitsu Ogasawara
  • Patent number: 5402047
    Abstract: A device for controlling a motor unit which displaces a screening unit which includes a power supply with at least one controlled electronic switch designed to feed a regulated electrical output to the motor unit and a control loop with a circuit which detects the difference between the value of the electrical output produced by the power supply and a reference value, and wherein the reference value is selected for the electrical output as a function of input signals received by the device.
    Type: Grant
    Filed: July 21, 1993
    Date of Patent: March 28, 1995
    Assignee: SIMU
    Inventors: Rene G. Bresson, Thierry J. Genin, Jean E. Giraud
  • Patent number: 4962337
    Abstract: A circuit for controlling bi-directional operation of a vehicle window lift motor having a toroidal coil sensing counter-emf perturbations in the motor current line. An EXPRESS mode switch, upon momentary actuation, latches an electronic switch to operate a relay to provide continuous motor rotation for lowering the window. Subsequent momentary switch actuation unlatches the electronic switch to cut interrupt window motor current. Window lift motor stall is detected by a toroidal coil which senses loss of motor line perturbations and unlatches the electronic switch to open circuit the motor relay.
    Type: Grant
    Filed: February 23, 1990
    Date of Patent: October 9, 1990
    Assignee: Eaton Corporation
    Inventor: Brian T. Creed
  • Patent number: 4881460
    Abstract: A postage meter having a rotable print drum also has a control arrangement ensuring that power is fed to the motor which drives the print drum via at least two parallel paths. One of these paths is operative to cause the motor to be driven until an envelope trip switch signifies that the envelope is fully discharged from the meter, irrespective of whether the other path is electrically conductive or not.
    Type: Grant
    Filed: August 26, 1987
    Date of Patent: November 21, 1989
    Assignee: Pitney Bowes Inc.
    Inventors: Ray L. Bannister, Frederick C. Close, Peter J. Coeber
  • Patent number: 4628234
    Abstract: A window regulator device for automatically elevating or lowering a window glass of an automobile is equipped with a safety device that operates when a human arm, for example, is sandwiched between the glass and its window frame. The regulator device consists of a motor for moving the glass up or down, a detector circuit for sensing whether the motor is locked, a reversing circuit connected to the detector circuit for reversing the motor, a latching circuit for maintaining the motor energized, and an operated switch for permitting the motor to move the glass up or down.
    Type: Grant
    Filed: August 14, 1985
    Date of Patent: December 9, 1986
    Assignee: Alps Electric Co., Ltd.
    Inventors: Ken Mizuta, Shiro Kondo
  • Patent number: 4527663
    Abstract: An apparatus for controlling an AC powered elevator and for improving the safety of the operation of the elevator includes: a three-phase AC power source; a drive device connected to the three-phase AC power source for converting an AC signal into an AC power having a variable frequency, thereby enabling the controlling of an induction motor; a winding induction motor connected to and controlled by the drive device for driving the cage of the elevator; a door induction motor connected to and controlled by the drive device for opening or closing the cage door provided at the cage of the elevator; and a motor control command device having an operation command generator which generates a command for starting or stopping the cage of the elevator so as to control the drive device and a door command generator which generates a command for opening or closing the cage door so as to control the drive device for independently controlling the winding induction motor and the door induction motor.
    Type: Grant
    Filed: May 25, 1983
    Date of Patent: July 9, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Masami Nomura
  • Patent number: 4496942
    Abstract: Apparatus and method for door operation remote control. A radio transmitter transmits a door operation command signal for a predetermined time when the operator operates a switch, irrespective of a turn-on time of the switch. Upon receipt of the door operation command signal from the radio transmitter, a door operation control signal is generated to effect the operation of a door.
    Type: Grant
    Filed: March 5, 1982
    Date of Patent: January 29, 1985
    Assignee: Hitachi, Ltd.
    Inventor: Shigeru Matsuoka
  • Patent number: 4455517
    Abstract: An improvement in door activating control apparatus including a short delay between the time the door is stopped during its closing direction of travel and starts moving in the opening direction when any one of any switch or button for opening the door is activated, prevents the stress incurred when the door is required to instantly reverse its direction of travel while closing, demonstrates a distinct advantage especially when controlling large heavy doors, or for door openings that require a high volume of traffic and in emergency situations, includes a means to by-pass the delayed reversing when the door is in the closed position. Features a novel means of using a single pole double throw switch which will serve to defeat a safety edge device and by-pass the delayed reversing, embodied in a single enclosure along with the door closing limit switch, all actuated by a single mechanical actuating device at the door closed position, demonstrates distinct advantages in door operator design.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: June 19, 1984
    Inventor: Donald A. Mitchell
  • Patent number: 4328451
    Abstract: The device comprises for each window an electric driving motor and a selector which is adapted to ensure the selective supply of current to the motor, in one direction or the other, through a control circuit acting on a supply source. The supply source is of the type capable of delivering at least two distinct energy levels. The control circuit comprises means for applying to an input of the supply source an energy level control signal which produces, as a function of the position of the selector, the application of a torque to the motor when raising the window which is higher than the torque applied when descending the window.
    Type: Grant
    Filed: June 25, 1980
    Date of Patent: May 4, 1982
    Assignee: Aciers et Outillage Peugeot
    Inventor: Jean A. Barge
  • Patent number: 4247806
    Abstract: A garage door opener includes a radio receiver and a push button each operable to initiate a pulse for effecting a switching device which in turn energizes a latching relay. Operation of the latching relay completes an energizing circuit to the appropriate winding of a reversible motor which moves the door toward an open or closed position. A sensing circuit is operable for effecting the reversal of the latching relay to change the direction of motor operation in the event the door engages an object in its path. A foot switch may also be provided for positively sensing an obstacle and reversing the drive motor. A transmitter may be provided with an impulse circuit to limit the duration of the system actuating signal regardless of how long the transmitter push button is depressed.
    Type: Grant
    Filed: April 6, 1978
    Date of Patent: January 27, 1981
    Assignee: Holmes-Hally Industries
    Inventor: Carl E. Mercier
  • Patent number: 4167694
    Abstract: A control device is disclosed for controlling the drive means and consequently the oscillation range of a periodically oscillating member particularly when it is necessary to maintain the speed of the periodic oscillation movement such that it corresponds to the average speed of another drive unit. Two movably mounted sensors are located near opposite ends of a predetermined oscillation range of the oscillating member. When either of the sensors senses the presence of the oscillating member beyond the predetermined oscillation range, a signal is generated by the sensor which is transmitted to control means adapted to adjust the speed of the drive means operating the oscillating member.
    Type: Grant
    Filed: December 2, 1977
    Date of Patent: September 11, 1979
    Assignee: Hergeth KG Maschinenfabrik und Apparatebau
    Inventors: Eduard Hille, Jurgen Andermann
  • Patent number: 4142137
    Abstract: A control system for a power driven operator for garage doors and the like comprising an operator control circuit having a DC voltage source operating as the power supply for an electronic flip-flop device responsive to successively applied input signals to alternatively establish circuits of opposite direction through a reversible electric motor; i.e. one actuation causes the motor to run in one direction and the next actuation causes it to run in the opposite direction. The operator is subject to actuation by both a hard wired push button or an auxiliary device such as a radio receiver which is responsive to signals from a remote transmitter. The operator control circuit includes a feature which electronically prevents the simultaneous energization of the reversible electric motor in both directions.
    Type: Grant
    Filed: December 22, 1977
    Date of Patent: February 27, 1979
    Assignee: Multi-Elmac Company
    Inventors: Kenneth F. Umpleby, Maurice R. Brackney
  • Patent number: 4140952
    Abstract: An offset compensated electronic current sensor and controller for automatically controlling the extension and retraction of a power antenna with the energization and de-energization of an automobile electronic search tune radio receiver.
    Type: Grant
    Filed: March 23, 1977
    Date of Patent: February 20, 1979
    Assignee: Chrysler Corporation
    Inventor: Kenneth L. Miller
  • Patent number: 4134050
    Abstract: Improved door activating motor control apparatus employs a self latching safety edge relay which is selectively energized by any of "open", one-button universal or obstruction-sensing safety edge contacts. A motor controlling contactor switch has its "open" direction coil and contact portion operated by safety edge relay contacts, and its "close" relay portion operated under control of a "close" or the one-button switch.The composite control apparatus of the instant invention exhibits significant operational advantages over prior art structures including, inter alia, frequency exercise of safety edge relay contacts, responsiveness to the "open" switch in an emergency situation, and retention of an obstruction sensing signal to cause door opening.
    Type: Grant
    Filed: January 25, 1977
    Date of Patent: January 9, 1979
    Inventor: Dan Sibalis
  • Patent number: 4001661
    Abstract: A one-touch action type power window having a retaining circuit which continuously actuates a motor for raising or lowering window glass in response to a one-touch operation on a switch. A pick-up coil is located in the vicinity of a wire through which the motor operating current flows to generate a voltage varying in proportion to the rotational speed of the motor thereby to control the retaining circuit.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: January 4, 1977
    Assignee: Toyota Jidosha Kogyo Kabushiki Kaisha
    Inventor: Gosaku Terabayashi
  • Patent number: 3993940
    Abstract: By actuating a momentary contact switch, an energizing circuit applies an AC voltage directly to one of the two field windings of a two-phase reversible AC induction motor to drive that motor in one of its two directions. As the motor begins to rotate, the shifted phase voltage appearing at the other field winding has a relatively high magnitude and this is employed to energize a neon photo coupler which then completes a holding or latching circuit for maintaining the motor energized so that it continues to rotate. If the motor stalls or if its rotation is purposely stopped, which may be caused by a limit-of-travel switch actuated by apparatus driven by the motor, the magnitude of the shifted phase voltage decreases and the neon photo coupler de-energizes, thereby disabling the holding circuit. By actuating another momentary contact switch, motor rotation in the opposite direction occurs and another holding circuit effects continued motor rotation until the motor stalls or is purposely stopped.
    Type: Grant
    Filed: December 26, 1974
    Date of Patent: November 23, 1976
    Assignee: Borg-Warner Corporation
    Inventor: Joseph A. Volk, Jr.
  • Patent number: 3959699
    Abstract: Two electric motors are coupled to each other and to a device which is to be bi-directionally actuated. An associated electrical control circuit comprises switches and delay timers, for energizing the first motor to drive the device in one direction and concurrently drive the second unenergized motor, and then to energize the second motor to drive the device in another direction and concurrently drive the first unenergized motor.
    Type: Grant
    Filed: November 25, 1974
    Date of Patent: May 25, 1976
    Inventor: Fred Brail