H - Electricity – 01 – H
Patent
H - Electricity
01
H
306/9
H01H 9/06 (2006.01) H01H 9/52 (2006.01)
Patent
CA 1252498
ABSTRACT OF THE DISCLOSURE This invention relates to a variable speed trigger switch particularly adapted for use with electric power tools such as drills. The trigger switch features clam shell construction and a single vertically disposed circuit board thereby facilitating assembly and resulting in a low cost and compact unit. Wire connections are kept to a minimum through use of the circuit board in accordance with this invention having power contact resistance and wire terminal connectors formed directly on the board. The trigger switch includes a locking feature enabling the trigger switch to be locked at a desired position and further provides an adjustable detent which can be felt by the user during trigger retraction. me electronics package of the trigger switch employs an electronic motor speed control circuit which provides a combination of open loop and closed loop motor control.
515384
Bailey R. Roby Jr.
Lessig William R. III
Smith Stephen W.
Wheeler Dale K.
Black & Decker Inc.
Gowling Lafleur Henderson Llp
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