Amusement devices: toys – Rolling or tumbling – Remotely controlled
Reexamination Certificate
1999-08-09
2001-09-11
Muir, D. Neal (Department: 3712)
Amusement devices: toys
Rolling or tumbling
Remotely controlled
C446S456000, C446S484000, C463S062000
Reexamination Certificate
active
06287167
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a driving circuit for toy car, and more particularly a drive circuit to control a driving motor based on a throttle open signal from a transmitter.
2. Description of the Prior Art
When the toy car is run by a remote control operation in a circuit, an operator should control a car speed of the toy car in response to a curved course and/or a straight course. When the car speed is controlled, a throttle open degree control lever of a transmitter is operated to change a revolution number of the driving motor mounted on the toy car. It is requested to change a pulse width of a pulse signal which drives the driving motor.
For example, when the car speed is lowered when the toy car curves, a pulse width PW of the pulse signal is lessened, as shown in FIG.
7
(
a
) thereby lowering the revolution number of the driving motor. On the other hand, when the speed of the car is raised to run the straight course, its pulse width PW of the pulse signal, as shown in FIG.
7
(
b
) is enlarged, to raise the revolution number of the driving motor time, a pulse frequency P(1/f frequency) of the pulse signal is not changed but kept constant.
To this end, each circuit on which the toy car runs, a course lay-out and size of a course vary, and construction of the toy car body varies.
For example, there are often opportunities to use the driving motor of wheels, at a low speed revolution, thereby raising a torque at a low speed revolution high, to be able to run the curve course forcibly.
In a straight course with less curves, there are often opportunities to use the driving motor of the wheels at high speed; it is required to smoothly rotate the motor to raise a revolution efficiency of the motor at high.
For this reason, when the toy car is run on a curved course, the pulse frequency P of the pulse signal to drive the driving motor is preset at high (see solid line g
1
in
FIG. 8
) to raise torque at a low speed revolution (see solid line g
1
in FIG.
9
).
On the other hand, for relatively straight course with few curves for the car drive, the pulse frequency P of the pulse signal to drive the driving motor is preset low, prior to a run of the car (see dotted line g
2
in
FIG. 8
graph), to smoothly rotate the motor, to raise revolution efficiency (see dotted line g
2
in
FIG. 9
graph).
Thus, the driving circuit in the prior art is pre-changed at its pulse frequency to meet the course. When the car is run on the curved course, for example, it is difficult to attain high revolution efficiency with smooth revolution of the motor, on the straight course.
On the other hand, when the car is run on the straight course, it is difficult to raise the torque on the curved course.
SUMMARY OF THE INVENTION
This invention provides a driving circuit for the toy car to enable raising the driving motor torque for runs on a curved course to achieve a forceful run, while on the run on the straight course, the driving motor is smoothly rotated to raise the efficiency of revolution. Thus, all the drawbacks in the prior art are overcome. To achieve said object of this invention, it has a speed controller in the drive circuit to control the revolution number of the driving motor on the toy car for run of the toy car, said speed controller being able to change the pulse frequency and the pulse width of the pulse signal to control the driving motor.
The above driving circuit of this invention has a speed controller by which the pulse frequency and the pulse width of the pulse signal are changed.
Thus, this invention achieves a change of the pulse frequency driving a run of the toy car. Then, the torque of the driving motor is adjustable in response to the revolution number of the driving motor and the smooth rotation of the driving motor in response to the revolution number of the driving motor is achieved. In a preferred embodiment the speed controller enlarges the pulse frequency when the pulse width is lowered, while lowering the pulse frequency when the pulse width is enlarged.
While at a low speed revolution of the driving motor, and the pulse frequency of the pulse signal is enlarged, and the pulse frequency of the pulse signal is lowered when the driving motor rotates at a high speed. For this reason, as the driving motor torque can be enlarged when the toy car is run on a curved course, the toy car can be forcefully run on a curved course. To the contrary, when running on the straight course, the driving motor is smoothly rotated, so that the revolution efficiency of the driving motor is raised.
REFERENCES:
patent: 3569969 (1971-03-01), Lemon, Jr.
patent: 3705387 (1972-12-01), Stern et al.
patent: 4080602 (1978-03-01), Hattori et al.
patent: 4143307 (1979-03-01), Hansen et al.
patent: 4275394 (1981-06-01), Mabuchi et al.
patent: 4349986 (1982-09-01), Tsukuda
patent: 4548584 (1985-10-01), Townsend
patent: 4712184 (1987-12-01), Haugerud
Dilworth & Barrese LLP.
Kondo kagaku Co., Ltd.
Muir D. Neal
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