Foot pedal motor control

Details Foot pedal motor control Foot pedal motor control

H - Electricity

01

C

338/9

H01C 10/10 (2006.01) H01C 10/14 (2006.01) H01C 10/30 (2006.01) H01H 21/26 (2006.01)

Patent

CA 1164542

ABSTRACT OF THE DISCLOSURE A foot pedal operated motor control is provided for controlling the speed of a motor, The entire motor control circuit is mounted in a foot pedal housing which circuit includes a generally disc shaped potentiometer having a rotatable and a stationary member with the movement, of the rotatable member with respect to the stationary member determining the resistance of the potentiometer which controls the current to a motor whose speed is to be con- trolled. The disc shaped potentiometer has an opening therethrough. A foot pedal is pivotally mounted on the housing overlying the potentiometer and a helical member extends between the foot pedal on one end thereof and into the opening of the disc shaped potentiometer on the other end thereof. When the foot pedal is depressed the helical member is moved linearly turning the rotatable member with respect to the stationary member of the disc shaped potentiometer thereby varying the resistance of the potentiometer which controls the current in the motor control circuit in accordance with the movement of the foot pedal. This control is considerably less expensive than slide type or other rotary type potentiometers. The motion of the foot pedal translates a half inch of linear motion from a full off to full on position on the rotary potentiometer. Accordingly, any wear is spread over 270° of available rotation of the potentiometer. The resistance is varied from 0 to 100,000 ohms providing a wide range of motor control at an inexpensive price. Expensive couplings, linkages and gearings are not required to translate the linear motion of the pedal into a rotary motion for changing the resistance of the potentiometer.

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