Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1976-08-02
1978-06-27
Scott, James R.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 1V, 310 50, 318345R, H01H 1308, H02P 700
Patent
active
040977048
ABSTRACT:
An industrial grade trigger switch having an on-off switch and a resistor controlled speed control circuit both controlled by trigger depression and a reversing switch provided with an operating lever overlying the trigger, and characterized by a large heat sink for the solid state current control elements for continuous service, a large substrate area for the speed control circuit, higher current rating double-pole wiping contacts, relatively simple metal parts, and the capability of being mounted also in consumer grade tools. The switch has modular construction with snap-in coupling of reversing switch and base to the frame.
REFERENCES:
patent: RE26781 (1970-02-01), Frenzel
patent: 3260827 (1966-07-01), Frenzel
patent: 3328613 (1967-06-01), Gawron
patent: 3447057 (1969-05-01), Brown et al.
patent: 3456229 (1969-07-01), Matthews
patent: 3467801 (1969-09-01), Matthews
patent: 3536973 (1970-10-01), Matthews et al.
patent: 3543120 (1970-11-01), Robertson
patent: 3579002 (1971-05-01), Wickham
patent: 3632936 (1972-01-01), Piber
patent: 3637967 (1972-01-01), Braun
patent: 3648142 (1972-03-01), Corey et al.
patent: 3694699 (1972-09-01), Snyder et al.
patent: 3761788 (1973-09-01), Matthews et al.
Arrow-Hart, Inc., Trigger Speed Control Switch with Reversing and Trigger Lock, Photo Nos. 7262-1 to 7262-4, and sketch.
Autio William A.
Cutler-Hammer, Inc.
Rather Hugh R.
Scott James R.
Taken Michael E.
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