Trigger speed control switch with plastic pack semi-conductor

Details Trigger speed control switch with plastic pack semi-conductor Trigger speed control switch with plastic pack semi-conductor

1974-07-09

1976-02-03

Schaefer, Robert K.

Electricity: motive power systems

Series motors

Control by motor circuit impedance

200157, H02P 516

Patent

active

039367088

ABSTRACT:
A portable tool double-pole trigger switch enclosing a speed control circuit that includes a plastic pack SCR (semi-conductor controlled rectifier) of the sensitive gate type, a capacitor and a variable resistor. In a first version, the mounting tab of the SCR is soldered to a connector that is contacted by the resistor slider. A ceramic capacitor may be used by soldering its leads between the cathode and gate terminals of the SCR, the mounting tab serving as the anode terminal. A chip capacitor may be used by soldering it to bridge the cathode and gate terminals. In another version, the mounting tab may be arranged to be contacted directly by the resistor slider, thus eliminating the aforesaid connector.

REFERENCES:
patent: 3439248 (1969-04-01), Winchester et al.
patent: 3536973 (1970-10-01), Matthews et al.
patent: 3775576 (1973-11-01), Brown
patent: 3842328 (1974-10-01), Supel et al.

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