Abstract: The invention is a remotely controlled ceiling fan and light assembly. Control of the assembly is accomplished by a transmitter (22) having a motor control button (26) and a light control button (24) to be depressed to control the fan (14) and light (18) on the assembly respectively. The motor control button (26) may be depressed for an extended time to reverse the direction of the fan (14). The transmitter (22) transmits a digitally coded radio signal wherein the coding is consumer selectable through switches. The receiver (20) on the fan and light assembly decodes (44) the pulses to ensure proper detection thereof. The eighth pulse of the radio coded signals indicates whether motor (16) or light (18) control is required. The receiver (20) includes a light control circuit (58) and motor control circuit (60) responsive to the decoded signal to control illumination of the light (18) and rotational speed and direction of the motor (16), respectively.

Abstract: A radio remote-controlled door operator for use, among other uses, as a residential garage door operator. The transmitter contains two buttons, one to produce normal door operation and the other to set the operator into a "secure" mode wherein it will be non-responsive to further valid operating codes until reset. In addition, a second deeper level of security may be established by means of a vacation switch which disconnects the operator from the AC power supply. The operator system comprises a microprocessor which is programmed to perform various accessory functions even through the accessories may not be present. Various microprocessor inputs are tied to a false "safe" level so that even though the accessory programs are run, no outputs result and no interference with normal door operation is produced.

Abstract: A garage door opener with solenoid latches is provided with a circuit for energizing the coils of the solenoid latches with power from a 24-volt step-down transformer, either as 120 volt power is applied to a motor to move the door in response to detection of an initial surge of current or as a manual or radio controlled command switch is actuated. In either case, current at a higher level is applied initially to pull in the armature locking pins of the solenoid latches, and thereafter at a lower hold-in level. A transformer with a single turn primary winding or a Hall-effect device may be used to detect the initial surge of current to the motor and in response thereto pull in the locking pins. Thereafter, hold-in current is applied as long as current to the motor is sensed.

Abstract: A power unit for a battery-driven toy containing a battery power source for energizing a driving means through a power switch and a controlling circuit is disclosed, in which the controlling circuit comprises a circuit element for controlling said driving means and its movable operative contact, said circuit element being provided with a thermo-switch and a reset circuit for setting said movable operative contact into an OFF position through said thermo-switch.

Abstract: An automatically guided vehicle (V) having a steering mechanism for enabling the vehicle to follow a guidance wire is disclosed. The vehicle includes a pair of spaced-apart steer drive antennas (S1, S2) and a pair of spaced-apart differential drive antennas (D1, D2). The steer drive antennas and differential drive antennas are in mutual perpendicular relation to each other and are stationarily mounted on the vehicle (V). In a steer drive mode, wheels (12) and (13) are separately controlled by steer drive antennas (S1) and (S2), respectively. The antennas cause the wheels to turn and therefore guides the vehicle (V) so that a wire (W) is followed.In a differential drive mode, wheels (12) and (13) that are positioned in parallel driving relation to each other and are controlled by antennas (D1, D2) respectively by varying the speed of the wheels (12, 13) to cause the vehicle (V) to follow the wire (W).

Abstract: A microphone senses a sound generated by the user clapping his hands and converts the sound into an electric signal which is applied to a flip-flop circuit to set the latter. The output of the flip-flop circuit is supplied through a time constant circuit to a drive and control circuit for operating a sound generating device having a reproducing stylus and a recorded disk. A reset signal producing circuit is provided to produce a reset signal for the flip-flop circuit when a second sound is sensed by the microphone within a predetermined time period set by the time constant circuit, thereby stopping the operation of the sound generating device.

Abstract: Disclosed is a starting device for a toy motor using an ultrasonic wave signal. The starting device comprises a transmitter external to the toy which generates an ultrasonic wave signal and a receiving and starting element disposed within the toy for receiving the transmitted ultrasonic wave signal and starting the toy motor. In a preferred embodiment, the motor drives a sound reproducing device. The ultrasonic wave signal from the transmitter is received, amplified, and detected, and when the detected output reaches a predetermined level, a switching transistor forming an energization path to the motor is turned on to start the motor. Once the motor is started, a self-holding switch associated with the switching transistor causes the switching transistor to supply continuous current to the motor even when the transmission of the ultrasonic wave signal has been terminated.

Abstract: A motor control device for a radio control system is disclosed. The motor control device is mounted on an object to be controlled so as to adjust a control range in each of forward, braking and backing of the object. The motor control device is provided with a variable reference signal source for generating a backing reference signal and a comparator for discriminating a region of control element on a transmitter side by comparing a braking-backing command signal generated from a drive control circuit with the backing reference signal. The control range can be adjusted by adjusting a level of the backing reference signal of the variable reference signal source.

Abstract: A radio frequency (r-f) transmitter has an electric oscillator circuit for producing an oscillating r-f signal in an antenna. A feedback sub-circuit of the oscillator circuit includes a surface acoustic wave (SAW) resonator for stabilizing the oscillations. The feedback circuit has a Q of less than 12000. There is a modulation sub-circuit of the oscillator circuit which includes a voltage variable capacitor. The voltage variable capacitor responds to input voltage variations to modulate the capacitance of the feedback circuit, thereby modulating the frequency of the transmitter. A garage door opener system employing the transmitter is also disclosed.

Abstract: A mobile robot calling system has a mobile robot normally waiting at a home position and connected to an AC power supply such that its battery is charged by the AC power supply in the wait status, and a calling oscillator for generating a calling signal to the mobile robot. The calling signal is supplied from the calling oscillator to the mobile robot through indoor AC power supply wiring. Relay transmitters are respectively arranged for a plurality of AC receptacles to relay the calling signal. A controller is arranged to control a plurality of calling devices and robot waiting stations. The controller cyclically checks the robot calling states of the calling devices and robot wait status in the waiting stations. The controller generates a robot calling command to the waiting stations in accordance with the robot wait status in the waiting stations when the robot calling signals are generated from the calling devices.

Abstract: A garage door locking mechanism incorporating a reversible motor mounted centrally on an overhead garage door and coupled with oppositely disposed rotary latches which are selectively rotated to lock the door in its closed position.

Abstract: For the remote control of construction machinery, more specially in the form of the distribution mast or boom of a concrete pump, in the invention a transmission system has a radio remote control unit whose control transmitter and receiver are joined up with the command unit and with the distributor for the solenoid valves respectively by respective plug contact connector means. The transmission mode is one using digitally encoded RF messages so that for each control function two part-messages are continuously transmitted after the connections have been made, such messages each being made up of a bit representative of the function, of address information and of a parity bit for security, and mirroring the condition of the circuits of the command unit. The receiver has a RF receiving part, a central process controller and a relay part or a D/A converter.

Abstract: A remote control system for bidirectionally rotating an electric motor, such as for opening and closing a blind or the like, comprises a hand-held transmitter including a transmitting circuit capable of developing a forward rotation command signal and a reverse rotation command signal, and a transmitter responsive to each of the command signals for producing a corresponding, predetermined number of infrared pulses for a predetermined amount of time. A receiver and drive unit is operatively coupled with the motor and comprises a receiver responsive to the infrared pulses for developing a corresponding received command signal, a discriminator circuit for determining whether the received command signal corresponds to the command signal for normal rotation or reverse rotation and for producing a corresponding forward rotation or reverse rotation control signal, and a drive circuit responsive to the control signal for causing rotation of the electric motor in the corresponding direction.

Abstract: An electric trolling motor is remotely controlled by a hand held or foot operated radiant energy transmitter coacting with a receiver, the trolling motor and a turning or directional motor connected through gearing with a trolling motor support shaft. The trolling motor can operate in a straightaway propulsion mode or in left hand or right hand directional turning modes, all remotely controlled. The fisherman is free to occupy the bow of the boat during fishing activities while remotely controlling the trolling motor at the stern.

Abstract: Overhead doors operating apparatus uses a single motor power unit to operate a selected one of a plurality of overhead doors through a selectively energized coupling, such as an electromagnetic clutch, or if desired, all of the doors in unison by energizing all the couplings. Thus only one motor power unit, instead of a power unit for each door, is needed to operate selectively one or more of the doors.

Abstract: A power window control apparatus has a transmitter, detachably mounted to a fixed member in a compartment, for transmitting coded infrared ray signals corresponding to opening/closing operations of right and left windows of a vehicle and a receiver fixed in the compartment, the receiver being provided with a manual switch for driving the relay circuit independently of the signal from the transmitter, a reset circuit for resetting the decoder for a predetermined period of time after an ignition switch is turned on, and a braking circuit for braking a corresponding one of motors when a driver releases a transmitter switch.

Abstract: The present invention relates to an integrated circuit for driving a d.c. motor with radio control comprising a receiving circuit for receiving and detecting certain signals transmitted from a transmitter, an amplifier for amplifying an output signal of said receiving circuit, a peak detector for converting the said amplified audio signal into a d.c. voltage, a comparator which have a hysteresis character dependent on the output level of the peak detector, a voltage regulating circuit supplying a stabilized voltage into all other components, and a direction control circuit to generate logic control signals deciding actual operation mode of the d.c. motor and motor driving circuits to produce motor driving signals by the output signal of the direction control circuit.

Abstract: A control unit for model vehicles, such as model railway trains, model automobiles, etc. For independent operation of several model vehicles on a common electric circuit, it is known to allocate to each model vehicle a receiver coded in relation with hardware and controlled according to a binary word consisting of an address part and a data part. Control units of this type, however, have the disadvantage that they cannot be operated on analog electric circuits. With the invention, a control unit is proposed which independently switches off the digital control logic in the case of a change of the model vehicle from a digital trackage to an analog trackage, and enables operation of the model vehicle via an amplitude-controlled or pulse width-controlled analog signal.

Abstract: Operators for sliding gates including a solenoid-operated detent for engaging a gear of the gate drive motor shaft speed reducer and locking the associated gate, and a key-operated cam for disengaging the detent from the gear.

Abstract: Lift apparatus by which invalids are translated into various positions through the use of a radio-controlled mechanism operable by the invalid from the lift transport platform. Linear actuators responsive to the radio control network operate to position a rotatable vertical member upon which there is mounted a cantilevered member which is also responsive to a linear actuator. The linear actuators have extendable rams which permit the cantilevered member which supports the invalid transport platform to be positioned in any of myriad locations.

Abstract: The present invention relates to a linear integrated circuit for driving a d.c. motor with remote radio control comprising an amplifier B.sub.1 to amplify the signal transmitted by the transmitter, a peak detector B.sub.2 detecting the said signal, a comparator B.sub.3 triggered by the d.c. output voltage of the said detector, transistors Q.sub.1 ', Q.sub.2 ' of the driving stage circuit B.sub.4, which can invert the driving direction of the d.c. motor by on or off operation of the said transistors in accordance with the output voltage of the said comparators, a voltage regulator circuit B.sub.5 and a thermal protection circuit B.sub.6 stabilizing the said transistors thermally.

Abstract: Apparatus is provided by which a motor vehicle window can be raised and lowered remotely by the use of a unique circuit which interfaces with the motor provided in the vehicle for such purposes. A hand-held transducer, utilizing either radio frequency energy or ultrasonic energy, is used to provide a momentary signal which activates the circuitry, configured to respond to a first signal by causing the window to be completely lowered. Transmission of a second identical signal will begin to raise the window and will continue to do so only as long as the signal remains activated.

Abstract: A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for preventing the door from being accidentally closed as long as the gas sensor detects an excessive level of toxic gas in the garage. A two button transmitter is used to sequentially close the garage door and set a security alarm subsystem. Warning devices are activated if the security alarm is attempted to be set without the garage door and windows in the home being closed. Once the security alarm has been set, the lock out circuitry also disables the garage door motor control circuitry until the security alarm is first deactivated. The transmitter generates a digital pulse train according to a preselected code, with the operation of the dual buttons changing the state of a particular control bit in the pulse train.

Abstract: A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for preventing the door from being accidentally closed as long as the gas sensor detects an excessive level of toxic gas in the garage. A two button transmitter is used to sequentially close the garage door and set a security alarm subsystem. Warning devices are activated if the security alarm is attempted to be set without the garage door and windows in the home being closed. Once the security alarm has been set, the lock out circuitry also disables the garage door motor control circuitry until the security alarm is first deactivated. The transmitter generates a digital pulse train according to a preselected code, with the operation of the dual buttons changing the state of a particular control bit in the pulse train.

Abstract: A method and apparatus for remote control surveying which eliminates the need for a rod man or other assistant while performing surveying operations with an electronic distance measuring device. The method includes positioning reflectors over the end points of a base line of known length, positioning an electronic distance measuring device over a desired survey station, rotating the reflectors into alignment with the electronic measuring device by remote control, and measuring the distance from the survey station to the two reflectors. The method also includes traverse operations using a single reflector positioned over a base point. The location of the survey station can then be calculated and the electronic distance measuring device may be relocated to subsequent survey stations and the reflectors realigned by remote control. The apparatus includes an attachment for a standard surveyor's tribrach which rotatably supports a standard reflector unit and an electric motor in a vertical position.

Abstract: An automatic guiding device for an indoor goods transporter comprising a path detector being responsive to stationary guiding facilities and controlling a steering means of the vehicle.

Abstract: A single channel continuous wave transmitter and receiver to produce a control signal to change the direction of the drive motor of a toy such as a model car having steerable wheels. A single electric motor provides the propulsion for the toy in one direction through the engagement of a planetary gear with a primary drive gear. The planetary gear is mounted on a rotatable ring surrounding the drive gear. When the direction of the motor is changed, the driver gear on the motor which is meshed with the planetary gear causes the planetary gear and ring to rotate until the planetary gear engages a secondary drive gear thereby changing the direction of travel of the vehicle. The rotational movement of the ring is also used as an actuator mechanism. This actuator mechanism is coupled to a cam that is in return coupled to the steering of the vehicle.

Abstract: A remote-controlled automatic door control apparatus includes a door, a driving unit connected to the door for driving the door to open and closed positions, and a control arrangement for controlling the door operation through the driving unit and including a radio communication system having a transmitter and a receiver. A signal containing a specific code transmitted from the transmitter is received by the receiver and collated with a code set previously in the receiver, and if they have a predetermined relationship with each other, an operation command is issued to the driving unit. The transmitter is capable of being set to a specific code, and the receiver includes a memory device for storing the specific code transmitted from the transmitter. A signal switching device is further provided for actuating the collating operation for collating the stored code with the signal from the transmitter under normal conditions and for storing a signal from the transmitter in the memory device if required.

Abstract: An infrared transmitter and control circuit for a load such as a ceiling fan which is capable of starting and regulating the speed of the ceiling fan as well as reversing the direction of the ceiling fan, controlling a light. The apparatus allows the selective control of a single one of a plurality of ceiling fans such that operation of the control does not cause all of the ceiling fans to change speed. The apparatus eliminates the need for running wiring between the ceiling fan and a switch and saves substantial installation costs.

Abstract: A garage door operation control apparatus includes a door operating system for opening and closing the main door of a garage, a main detection circuit for detecting the open or closed condition of the main door, an auxiliary detection circuit for detecting an open condition of a window or an auxiliary door of the garage, a fire in the garage or generation of a special gas therein, an alarm and a signal processing circuit. Electrical signals from the detection circuit are logically analyzed thereby to control the door operating system and the alarm.

Abstract: A radio controller for radio control of model vehicles and the like. The controller can be placed in a control mode wherein vehicle functions such as motor speed, direction, horn and lights are controlled by control signals. In addition, the controller can be placed in a voice transmission mode wherein an audio signal is transmitted to the vehicle and broadcast from a speaker mounted on the vehicle. The receiver of the radio controller is switched from the control mode to the voice transmission mode by way of the control signals. When the receiver is placed in the voice transmission mode, the control signals are ignored with switching to the control mode being accomplished by receiver circuitry which detects a momentary absence of the transmitted carrier signal.

Abstract: A home security and garage door operator system includes a gas sensor for detecting the level of toxic gas in the garage. When the gas level exceeds a predetermined threshold the garage door is automatically opened. Lock out circuitry is provided for preventing the door from being accidentally closed as long as the gas sensor detects an excessive level of toxic gas in the garage. A two button transmitter is used to sequentially close the garage door and set a security alarm subsystem. Warning devices are activated if the security alarm is attempted to be set without the garage door and windows in the home being closed. Once the security alarm has been set, the lock out circuitry also disables the garage door motor control circuitry until the security alarm is first deactivated. The transmitter generates a digital pulse train according to a preselected code, with the operation of the dual buttons changing the state of a particular control bit in the pulse train.

Abstract: A motor starter includes a line contactor having a coil connected to a control circuit. The control circuit includes one or more remote pushbutton stations which are connected in a control loop by fiber optic tubes. Operation of the motor can be controlled separately from each pushbutton station.

Abstract: A motorized operator is used for control of a closure, e.g., a garage door operator. Where the garage door is an upward opening door, there are four conditions for operation of the control system, namely stop-down, run-up, stop-up, and run-down. The present operator is one wherein safety conditions prevail, in that the run-down condition may not be established by a simple single closing of a switch because this might be effected carelessly or accidentally. The run-down condition is only established by plural closings of a switch. Gate means are provided within the control system so that the plural actuations of the switch will establish the run-down condition and this may be established only when the door is in the stop-up condition. The plural actuations of the switch must take place within a predetermined time period in order to establish the run-down condition.

Abstract: A radio-controlled toy has a transmitter designed to transmit a signal amplified and modulated with a low-frequency square signal by the supply of power effected by closing a switch and a receiver having a receiving circuit portion and a forward-to-reverse switching control. The transmitter may include an astable multivibrator for producing a low-frequency square signal and a crystal oscillation circuit. The forward-to-reverse switching control is designed such that when no signal is received, a d.c. motor turns forward and when a signal is received, the d.c. motor turns in reverse.

Abstract: Electronic transmitter means are used for generating and emitting a control signal which is detected by an animal-handling mechanism associated with the animal for physically manipulating the animal to control its movement. The animal-handling mechanism includes motors for controlling the tensioning of reins connected to the head of the animal. A control signal can also be transmitted to activate a bat mechanism for striking the animal to urge it forward.

Abstract: Rotary positioning of an antenna is provided from a remote control apparatus using a first reversible motor at the antenna and a second reversible motor at the control. A rotary switch at the control is coupled mechanically and electrically to the control motor such that movement of the rotary switch energizes both the antenna and control motors, which have substantially identical speed characteristics. When the antenna has attained the desired position, the system de-energizes itself. Mechanical resistance to movement of the antenna is simulated by a feedback motor mechanically coupled to the control motor and electrically connected in series with the antenna motor. The system contemplates use of direct current motors and a two wire connection between the antenna and the remote control apparatus.

Abstract: Random motion mechanisms having at least one driving element that is operated at randomly varying speeds. One such mechanism is a self-propelled vehicle which has at least one randomly operated driving wheel. The vehicle desirably has a second randomly operated driving wheel, which is parallel with the first, and at least a third supporting element which can take the form of a wheel.

Abstract: A data communications system between fixed and moving terminals wherein a conductor connected to the fixed terminal and disposed in the travel path of the moving terminals supports lateral guidance control information for the moving terminals as well as two-way inductive data communications between the fixed terminal and the moving terminals. The fixed (wayside) terminal transmits over the conductor an alternating current lateral guidance signal modulated in accordance with longitudinal control information for each of the moving terminals. Each of the moving terminals, in turn, transmits status information over the conductor to be used for developing control information at the fixed terminal. The fixed terminal employs hybrid transformer techniques in conjunction with precision filtering to enable reception of low-level status information from the moving terminals and concurrent rejection of the modulated lateral guidance signal and other interfering signals.

Abstract: A multi-function control system for generating control signals in response to the movement of an operator's body is disclosed.An arrangement of the multi-function control system for controlling the speed and direction of a wheelchair (12) includes a mirror (16) for mounting on the head of the operator, a housing (20) attached to the wheelchair, a light source (26) within the housing for shining on the mirror, light sensors (30, 32, 34, and 36) for sensing the light reflected by the mirror, and a control circuit (38) for driving the wheelchair motors (70 and 72) in response to the output signals of the light sensors. The housing forms an opening facing toward the mirror when the operator's head is in the normal forward position.The control circuit includes an input (39) that responds to the output signals of the light sensors, a signal processing circuit (43), and an output (53) which responds to the signal processing circuit.

Abstract: A radio control driving circuit device used for a model device having a radio control system comprising a d-c power supply, two electric motors and a receiver, characterized in that two transistors of the same type, instead of the conventional complementary type, are used as two transistors each connected in series to the right and left motors for separately driving each of the motors, and a common power supply is used for driving the motors to permit control signals from the receiver to be introduced via a phase division circuit.

Abstract: Separate high low pass of frequency filters are employed in a circuit to control the input response signal to a pair of motors for operating a mobile toy in response to a frequency modulated radio wave transmitted by a transmitting unit.

Abstract: Method and device for servo-controlling the distance of an object from a transiting surface to be followed by said object and capable of reflecting microwaves, by exploiting a control signal, wherein a radiating unit fast with said object provides directive microwave radiation and a symmetrical detector compares the phases of the radiated microwaves and the reflected microwaves, said detector providing a control signal to a servo-control circuit. The device is namely intended to automatic metal-welding machines in which the welding member forms said object and a metal workpiece forms the reflecting surface to be followed at a predetermined distance by said welding member.

Abstract: A radio controlled, battery-operated model toy having an electric motor, a battery device for supplying energy to the electric motor, a radio control receiver, and a servo mechanism operated by the output of the receiver, wherein a voltage responsive automatic circuit breaker which opens the electric circuit of the electric motor in response to a voltage drop in the battery device and holds the circuit in the open stage is provided between the battery device and the electric motor, and a voltage regulator/noise filter is provided between the battery device and the radio control receiver.

Abstract: An electronic speed controller for a radio controlled model has conversion circuitry to derive a dc signal having a level that is proportional to the information pulse width of the radio control signal, but which is insensitive to changes in the frame rate thereof. This dc signal level is compared with a reference triangular wave to obtain a digitial control signal having a duty cycle proportional to the information pulse width. This signal is used to gate battery voltage to the motor, thereby to control its speed.In one embodiment, the battery voltage is supplied to the motor via a power transistor. A switching regulator connected between the motor battery and the base of the power transistor provides sufficient base current to drive that transistor into saturation regardless of the motor battery voltage, and with the base current responsive to the Vbe of that transistor. The regulator is gated on by the digital control signal.

Abstract: A pulse width modulated DC motor speed control circuit for models including a demodulator for receiving an input pulse having a width which may vary from a reference width, and for generating a first positive output pulse having a width proportional to the variation when the width of the input pulse is less than the reference width and for generating a second positive output pulsehaving a width proportional to the variation when the width of the input pulse exceeds the reference width, and a braking circuit for receiving the first output pulse and in response thereto causing any back EMF generated by the motor to be shorted for the duration of the output pulse, and a driving circuit for receiving the second output pulse and in response thereto connecting a source of power across the motor for the duration of the output pulse.

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.

Abstract: An inspection probe is mounted in the spindle of a numerically controlled machine tool and is moved toward a workpiece therein by the numerical controls until it makes contact with the workpiece. Contact with the workpiece is indicated by change in the output signal of a portable transmitter mounted within the toolholder that carries the inspection probe. The change in output amplitude causes the instantaneous position of the spindle to be recorded in the numerical controls at the instant of contact between the inspection probe and workpiece to indicate the corresponding dimension of the workpiece. Movement of the spindle is stopped after contact between the inspection probe and workpiece to avoid damage to either the inspection probe or the workpiece.

Abstract: A throttle governor/collective pitch control apparatus for radio controlled model helicopters for proportionally controlling either the model helicopter rotor speed or the rotor collective pitch, including sensing and timing means determining the rotor speed and any changes thereof, comparison means for comparing a subsequently sensed rotor speed with a first sensed rotor speed and developing an error signal, and control means responsive to the error signal to provide a control signal proportional to any changes in the rotor speed. In the throttle governor mode any variations in rotor speed result in a proportional control signal to vary the model helicopter throttle so as to maintain constant rotor speed. In the auto-collective mode changes in rotor speed result in a proportional control signal coupled to the collective pitch servo for proportionally varying the model helicopter collective pitch.

Abstract: Control system including radio receiver circuit for a power-driven operator for garage doors and the like comprising an operator control circuit having a regulated DC voltage source operating as a power supply for an electronic flip-flop device responsive to successively applied input signals to 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 and a radio receiver which is responsive to signals from a remote transmitter. The power supply for the flip-flop is also the power supply for the receiver; however, the receiver is packaged separately from the operator and power supply and is readily disconnected for independent maintenance and repair.