Makita Electric Works, Ltd.

Omron Corporation

Omron Tateisi Electronics Co.

Akiharu Hayashi

Fusao Fushiya

Michio Okumura

Kunio Nagata

Fumiaki Itsuki

Yasumichi Fukuma

Yukimi Amano

Shinya Hamazaki

A switching circuit for varying rotational speed of a motor includes a power supply line for connecting the motor to a power source so as to supply driving power to the motor. A parallel connecting circuit of an on-off switch and a short circuiting switch is provided in the power supply line, in such a manner that the driving power is continuously supplied to the motor when the short circuiting switch is on, while in the case that the short circuiting switch is off, the driving power is supplied to the motor during on of the on-off switch but is not supplied during off of the on-off switch. A control member is provided for operation by an operator for varying rotational speed of the motor. The control member is operative for turning on the short circuiting switch at the maximum amount of its operation. The switching circuit further includes an output element for producing an output signal corresponding to the amount of operation of the control member, a continuously conductive switch to be continuously kept on when the control member is operated between the maximum amount of operation and the amount slightly smaller than the maximum amount, and a control element connected to the output element and the continuously conductive switch for controlling the on-off switch.

Switching circuit for varying rotational speed of motor

A combined locking mechanism and switch especially for power tools has a switch, an actuator for directly turning on or off the switch, a locking member shiftable between a first position in which it is disposed in opposed relation to the actuator and a second position in which it is spaced apart form the actuator, and an actuating member for actuating the actuator through the locking member only when the locking member is placed in the first position.

Combined locking mechanism and switch especially for power tools

Growing community of inventors

Anjo, Japan

Akiharu Hayashi