Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1986-12-22
1988-01-12
Ro, Bentsu
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318346, 318545, 318549, H02P 517
Patent
active
047193956
ABSTRACT:
A variable speed control switch for an electric tool including a DC motor having an armature circuit, includes: a device for turning off and on the armature circuit; an upper heat dissipation cover for covering the top of the turning off and on device; a lower heat dissipation cover for covering the bottom of the turning off and on device; a printed circuit board located at the lower surface of the lower cover for controlling motor speed; a resistor element is provided on the lower surface of the board; a movable contact assembly, including a first contact member for short circuiting the motor terminals, a second contact member for turning ON the power source, a third contact member for short circuiting the turning off and on device, and a brush for providing variable resistance by sliding over the resistor element; a device for biasing the movable contact assembly to the position of short-circuiting the motor terminals; a box like casing which receives the above-mentioned components, the power source terminals, the motor terminal, and provides a depending support portion; an operation lever, drivingly engaged to the movable contact assembly at its upper portion, provides the depending support portion of the casing at its lower pivoted portion, and being adapted to operatively rock about that pivoted portion. By this simple construction the number of parts of the control switch is minimized and the construction is compact, light and cheap.
REFERENCES:
patent: 4114076 (1978-09-01), Teranishi et al.
patent: 4218730 (1980-08-01), Marumoto et al.
patent: 4465958 (1984-08-01), Roberts
patent: 4506198 (1985-03-01), Savas
Aoi Tatsuo
Atsumi Haruo
Honda Sueaki
Kikukawa Takeshi
Kiyono Yasuhiro
Omron Tateisi Electronics Co.
Ro Bentsu
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