1978-08-07
1980-07-22
Phillips, Charles E.
46262, A63H 3004
Patent
active
042132703
ABSTRACT:
The direction of movement of a battery-powered wheel toy such as a toy car is controlled by a remotely located, hand-held transmitter. The car has a receiver and two motors mounted thereon, one motor being connected to drive at least one wheel of a first pair of wheels located at a first axle position, and the other motor being connected to drive at least one wheel of a second pair of wheels located at a second axle position. One of the wheel pairs and driving motor are mounted for pivotal rotation about an axis normal to the plane of the support platform for the car. The transmitter sends a modulated carrier signal to the receiver. The carrier is modulated by tone bursts. The duration of the tone bursts is determined by a variable potentiometer that is controlled by the operator at the transmitter. At the receiver, the tone-modulated carrier is detected and demodulated. The duration of the demodulated tone bursts determines the time duration that current is supplied to one DC motor. The duration of the absence of a tone determines the time duration that current is supplied to the other DC motor. By thus controlling the current to the motors, their speed of rotation is controlled which causes the toy car to turn left or right, depending on which motor is rotating faster. The difference in speed of rotation of the two motors determines the turning circle radius of the toy car.
REFERENCES:
patent: 3372393 (1968-03-01), Cataldo
patent: 3590526 (1971-07-01), Deyerl et al.
patent: 3832691 (1974-08-01), Galler
patent: 4080602 (1978-03-01), Hattori et al.
patent: 4152867 (1979-08-01), Ogawa
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