Power tool switch including speed control

Details Power tool switch including speed control Power tool switch including speed control

H - Electricity

01

H

306/9

H01H 15/02 (2006.01) H01H 9/06 (2006.01) H01H 9/52 (2006.01)

Patent

CA 1105530

POWER TOOL SWITCH INCLUDING SPEED CONTROL Abstract of the Disclosure A double pole, trigger actuated switch employs a bridge contact and a separate contactor for opening and closing both lines from a source of current to an associated power tool. The bridge contact is always closed first and opened last with respect to the contactor so that the former is not subjected to arcing and may be made smaller and less expensively than the latter. The contactor is of the fast closing type constructed to minimize arcing. A speed con- trol circuit is associated with the contactor. The entire switch, including the speed control circuit, is provided in a compact housing for mounting in small portable hand tools such as electric drills. A heat sink is exposed to the ambient air by virtue of louvers in the switch housing.

303067

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