Power tool switch including speed control

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

1978-01-10

1979-12-18

Smith, Jr., David

Electricity: motive power systems

Portable-mounted motor and/or portable-mounted electrical...

310 50, 200145, 318345R, H05K 714

Patent

active

041796446

ABSTRACT:
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 control 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.

REFERENCES:
patent: 2279753 (1942-04-01), Knopp
patent: 3372288 (1968-03-01), Wigington
patent: 3439248 (1969-04-01), Winchester
patent: 3447057 (1969-05-01), Brown et al.
patent: 3563973 (1970-10-01), Mathews
patent: 3648142 (1972-03-01), Corey et al.
patent: 3721879 (1973-03-01), Corey et al.
patent: 3761788 (1973-09-01), Matthews

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