Variable speed trigger switch

Electricity: circuit makers and breakers – Liquid contact – Time delay

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Details

200327, H01H 906, H01H 1308

Patent

active

046492453

ABSTRACT:
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. The 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.

REFERENCES:
patent: Re26781 (1970-02-01), Frenzel
patent: 3439248 (1969-04-01), Winchester et al.
patent: 3603757 (1971-09-01), Sahrbacker
patent: 3761663 (1973-09-01), Brown
patent: 3869591 (1975-03-01), Piber
patent: 4097703 (1978-06-01), Houser
patent: 4097705 (1978-06-01), Harvell
patent: 4241297 (1980-12-01), Piber et al.
patent: 4241298 (1980-12-01), Trammell, Jr. et al.
patent: 4572997 (1986-02-01), Yamanobe et al.

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