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| Number | Title | Issue Date |
| 4338552 | Automatic control system for d-c motor A reversible d-c motor, driving a load such as a vehicular radio antenna, has its armature winding connected in a transistorized energizing circuit which is activated by a start circuit and locks operated as long as the motor speed surpasses a certain thr... | 07/06/1982 |
| 4338553 | Control system for a motor actuated door operating mechanism A system is disclosed for controlling a motor which drives an operating mechanism for moving a door, such as an overhead garage door, in either direction between a closed position and an open position in response to actuation of a start switch. The contro... | 07/06/1982 |
| 4335339 | Electronic safety device An electronic safety device circuit is disclosed. This circuit includes two integrated circuit operational amplifiers, the first connected as an operational amplifier and the second connected as a follower. The output pin of the first amplifier is connect... | 06/15/1982 |
| 4329594 | Pivotal and slidable auto roof cover An apparatus for actuating a slidable and pivotally movable cover for use with an automobile roof opening comprises a control element, e.g. a disc, driven by an electric motor. A plurality of switch cones are preferably secured at equal radial distances f... | 05/11/1982 |
| 4328540 | Door operation control apparatus A door operation control apparatus comprising a memory circuit for storing a programmed data on door control processes in the form of a combination of command codes is disclosed. A door operation input signal, a mode or condition detection signal from a d... | 05/04/1982 |
| 4328451 | Device for controlling the electric drive motor of a window raiser in particular in an automobile vehicle 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... | 05/04/1982 |
| 4319169 | Safety control unit Safety control unit using a self-starting single-phase synchronous a.c. motor with a register closure.... | 03/09/1982 |
| 4305480 | Integral gain elevator door motion control An elevator system includes a microprocessor-based cab controller mounted directly on an elevator car, which controls elevator door motion in response to a velocity error indicative of the difference between the actual elevator door velocity and a desired... | 12/15/1981 |
| 4303872 | Telescoping antenna movable by means of a d.c. motor An antenna control system employing a d.c. motor for extending and retracting a telescoping antenna for use on a vehicle. The control system comprises a polarity responsive timer, a polarity reversal switch, and a switching device. In one position of the ... | 12/01/1981 |
| 4300660 | Elevator door motion reversal An elevator system having a microprocessor-based elevator door motion controller controls door motion by means of the difference between actual door velocity and a dictated door velocity, which is dictated in a variety of ways in dependence on conditions ... | 11/17/1981 |
| 4299308 | Position controlled elevator door motion An elevator employing a microprocessor-based cab controller, for controlling, among other things, the opening and closing of the elevator car door, provides a pair of dictated door velocity profile signals and selects the one having the lesser value, to d... | 11/10/1981 |
| 4289995 | Electric door operator with slip clutch and dynamic braking An automatic door closer providing for use as a light duty door opener and having a slip clutch for protecting the electric gear drive power unit from damage due to overspeeding on excess loads applied by overriding manual door operation. Zener diodes acr... | 09/15/1981 |
| 4281475 | Apparatus for opening and closing a door A door opener has a housing in which is contained a small fractional-horsepower reversible motor whose output shaft is connected to a worm gear journaled in the apparatus and meshing with a main gear in turn connected to an output member constituted as a ... | 08/04/1981 |
| 4274037 | Motor speed control system A speed control system for a motor comprises a main motor circuit for supplying the motor current to the motor from an AC power supply via a main switch, a full-wave rectifier circuit and a semiconductor element with a control electrode, variable voltage ... | 06/16/1981 |
| 4272708 | Window lifter installation This invention refers to a circuit arrangement for a motor for the purpose of driving a window in motor vehicles comprising a motor current supervising stage for switching the motor in case of blocking, wherein the motor current supervising stage responds... | 06/09/1981 |
| 4263536 | Control circuit for a motor-driven door operator A door operator includes a motor-driven mechanism to move a door between an open position and a closed position in response to activation of an improved control circuit. The improved control circuit includes circuitry to initialize the sequence of operati... | 04/21/1981 |
| 4220900 | Motor control system for a linearly reciprocating load device such as automotive vehicle closure including sun roof A system is provided to control a load responsive to a maximum load condition to disable the load when the maximum load condition exists, the control being altered first to provide a period of non-response during load start up and secondly to provide temp... | 09/02/1980 |
| 4166239 | Roll film drive control arrangement Drive control arrangement for roll film having an end attached to a reel shaft and in which an increase in the load imposed on a reel drive motor caused by increased tension in the film when the attached end of the film is reached during film unwinding, o... | 08/28/1979 |
| 4164692 | Operating mechanism for a pivotable sliding panel Control apparatus is provided for an electromechanically operated closure panel such as used for sun roofs of automobiles and the like. The control apparatus includes a reversible electric motor drivingly connected to move the closure panel between a clos... | 08/14/1979 |
| 4145641 | Automatically-openable-and-closable-door operating apparatus An automatically-openable-and-closable-door operating apparatus uses a capacitor torque motor in order to automatically open or close the door. When opening or closing the door, an exciting coil of the motor is first short-circuited as the door approaches... | 03/20/1979 |
| 4131830 | Position control and obstruction detector apparatus for a motor-driven door operator An improved position control apparatus is disclosed to control a motor-driven door operator to halt movement of a door at an open position and a closed position. The position control apparatus includes a control screw means in the form of a threaded shaft... | 12/26/1978 |
| 4127843 | Position sensor device for elevator car A position sensor disposed on an elevator car has a first rotatable shaft connected to a secondary winding of a transformer or a switch actuating member, and a second rotatable shaft coaxial with the first shaft and connected to a primary transformer wind... | 11/28/1978 |
| 4119896 | Sequencing control circuit A sequencing control circuit is provided for a door operator motor which is connected to open and close a garage door as controlled by signals from manual switches and load switches. The sequencing control circuit includes time delay means with a first ti... | 10/10/1978 |
| 4099110 | Proportional control for guidance system A guidance system for positioning a welding apparatus with respect to a seam or joint to be welded by sensing changes in the surface of the seam. The torch of the apparatus is mounted upon and positioned by a motor-driven cross-slide providing both horizo... | 07/04/1978 |
| 4096903 | Power drive for a venetian blind The upper channular frame supporting the venetian blind houses a rotary shaft parallel to the slats of the blind and from which the slats are suspended by a pair of nylon ladders. The shaft is driven by a small D.C. motor and gear reduction unit having an... | 06/27/1978 |
| 4095151 | Circuit arrangement for an a-c series motor An a-c series motor with a switching device for changing from motor to braking operation has a series circuit consisting of a capacitor and a charging diode associated therewith, in which, in order to avoid an additional resistor for limiting the charging... | 06/13/1978 |
| 4017832 | Two wire command and monitoring system An improved system and method for transmitting and monitoring, for example, commands to relays or other output command devices driving controlled devices remotely located from the transmission portion of the transmission and monitoring system. The system ... | 04/12/1977 |
| 4013933 | Needle position detector for industrial type sewing machines A rotating disc driven in synchronism with the reciprocating movement of the needle of a sewing machine has a plurality of cutaway arc-shaped sections having different arcs to produce a pulse train of frequency related to the motor speed. A photoelectrica... | 03/22/1977 |
| 4010408 | Switch mechanism for door operator An operator for an upwardly acting door. A reversible electric motor is drivingly connected to the door by an intermediate drive linkage. A switch assembly is associated with the operator for controlling the upward and downward movement of the door, which... | 03/01/1977 |
| 4006392 | Electronic sliding door An electronic door control system is disclosed having a d.c. motor rotatable in one direction for opening a door and in the opposite direction for closing the door. One or more semiconductor devices (preferably SCR's) supply d.c. power to the motor from a... | 02/01/1977 |
| 3996697 | Door operator with screw drive An operator for opening and closing an upwardly acting door, which operator includes an elongated rotatable drive screw having one end thereof drivingly connected to a power unit and the other end thereof disposed adjacent the upper edge of the door openi... | 12/14/1976 |
