H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/115, 310/14
H02P 7/29 (2006.01)
Patent
CA 1270511
ABSTRACT In this variable speed control switch for an electric tool including a DC motor which has an armature circuit, there are included: a device for turning on and off the armature circuit; an upper heat dissipation cover which covers the top of the turning off and on device; a lower heat dissipation cover which covers the bottom of the turning off and on device; a printed circuit board located on a lower surface of the lower cover and carrying a control circuit imprinted on it; a resistor element provided on a lower surface of the board and included in a speed variation control circuit for the motor; a movable contact assembly, including a first contact member for short circuiting terminals of the motor, a second contact member for turning ON a 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 a position to short circuit the first contact member; a box like casing which receives these components into its opening, receives on one side power source terminals and a motor terminal, and has a depending support portion, and an operation lever which is drivingly engaged to the movable contact assembly at its upper portion and is pivoted to the depending support portion of the casing at its lower pivoted portion, thus 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 made compact, light, and cheap.
526745
Aoi Tatsuo
Atsumi Haruo
Honda Sueaki
Kikukawa Takeshi
Kiyono Yasuhiro
Omron Tateisi Electronics Co.
Ridout & Maybee Llp
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