Drill having alternate mode control

Details Drill having alternate mode control Drill having alternate mode control

1988-02-03

1992-05-19

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

H02P 700

Patent

active

051151758

ABSTRACT:
A drill having a variable speed trigger and logic circuit which can control the direction and speed of rotation. In an alternating mode of operation, the logic circuit alternates the direction of motor/chuck rotation on each successive activation of the trigger. The drill can also be set to rotate in either a forward or reverse direction without the alternating feature. A pair of lights provide visual confirmation that the drill is set to rotate in either a forward or reverse direction. The drill can also be set in a safe mode to prevent rotation in either direction.

REFERENCES:
patent: 4085337 (1978-04-01), Moeller
patent: 4266171 (1981-05-01), Mashimo
patent: 4355270 (1982-10-01), Cook et al.
patent: 4412158 (1983-10-01), Jefferson et al.
patent: 4649330 (1987-03-01), Kim
patent: 4667119 (1987-05-01), Holmes
patent: 4689534 (1987-08-01), Gerber et al.
patent: 4728876 (1988-03-01), Mongeon et al.
patent: 4777393 (1988-10-01), Peot

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