Power hand tool switch torque controller apparatus

Details Power hand tool switch torque controller apparatus Power hand tool switch torque controller apparatus

2009-03-09

2011-11-01

Enad, Elvin G (Department: 2832)

Electricity: circuit makers and breakers

Solid contact

Push button operated

C200S334000

Reexamination Certificate

active

08049128

ABSTRACT:
This invention is for a trigger switch apparatus for a hand held electric drill and includes a control of the electric power to a drill for fast or slow rotation of the drill bit by moving a rheostat contact bridge over a rheostat coil section for control of the rotation speed of the drill bit, and further a leaf spring holds the trigger carriage stop shoulder onto the carriage, and on seizure, kick back or sudden torque of the drill bit there is a cut off of power and the switch reverts to an “off” or “open” position, which then requires re-setting of the switch to a “closed” or “on” position for re-actuating operation of the hand held electric drill.

REFERENCES:
patent: 2810051 (1957-10-01), Johnson
patent: 3117206 (1964-01-01), Bush
patent: 3194898 (1965-07-01), Thomas
patent: 4097703 (1978-06-01), Houser
patent: 4572997 (1986-02-01), Yamanobe et al.
patent: 5012057 (1991-04-01), Inuyama
patent: 5165531 (1992-11-01), Kawakami et al.
patent: 5380971 (1995-01-01), Bittel et al.
patent: 5401928 (1995-03-01), Kelley
patent: 6469268 (2002-10-01), Schaeffeler et al.
patent: 7511240 (2009-03-01), Inagaki et al.

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