H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/110, 310/14
H02P 7/06 (2006.01) H01H 3/00 (2006.01) H01H 9/06 (2006.01)
Patent
CA 1082764
Abstract of the Disclosure A chopper for adjustably controlling the average value of the voltage supplied from a D.C. battery source to a motor load for adjustable speed control. The chopper comprises manually-operable spring-biasing means for applying force to close a contact to energize the motor and electro- magnetic means simultaneously energized for re-opening the contact. This occurs at a high repetition rate so that the average value of the voltage across the motor determines the motor speed. This average value of voltage is proportional to the closed-to-open time ratio of the contact and is adjust- able by manual control. Two versions are disclosed. In the first version, the spring-biasing force is applied to the contact by depressing a trigger. In the second version, the spring-biasing force is applied to the contact by rotation of a knob. Both versions may use either tension or compression spring force.
291723
Barcz James P.
Bigelow James H.
Jaeschke James R.
Piber Earl T.
Spellman Gordon B.
Cutler-Hammer World Trade Inc.
Ridout & Maybee Llp
LandOfFree
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