Electric rotary power tool apparatus holdable by hand during ope

Details Electric rotary power tool apparatus holdable by hand during ope Electric rotary power tool apparatus holdable by hand during ope

1986-06-27

1989-04-18

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Sequential operations

200567, 310 68A, H01H 900, H01H 2100, H02K 1100

Patent

active

048229580

ABSTRACT:
A switch for controlling electric D.C., especially for a power tool held by hand during operation, for heavy duty work, preferably from an automobile battery, of 8 to 40 volts and sufficient amperage for at least about 180 watt-input into the idling tool motor, comprises a base mountable on the motor rearwall, fixed contactors on the base, a supporting member bearing shiftable contactor elements, a first engaging member on the base, another engaging member on the supporting member and pivotably engaged by the first engaging member, a resilient organ urging the two engaging members into engagement, and preferably enhancing contact pressure between the fixed and shiftable contactors when a manual actuator has pivoted the supporting member from neutral into an activating position. A restoring spring can return the supporting member automatically to neutral.

REFERENCES:
patent: 2293015 (1942-08-01), Cohen
patent: 3434366 (1969-03-01), Raso
patent: 3681550 (1972-08-01), Perry
patent: 3755640 (1973-08-01), Kaman et al.
patent: 3821902 (1974-07-01), Du Bois et al.
patent: 4314170 (1982-02-01), Sahrbacker
patent: 4368784 (1983-01-01), Wunsch et al.
patent: 4505170 (1985-03-01), Van Laere
patent: 4558189 (1985-12-01), Dibbern, Jr. et al.
patent: 4619162 (1986-10-01), Van Laere

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