Electrically driven hand-operated tool

Details Electrically driven hand-operated tool Electrically driven hand-operated tool

1983-10-07

1987-08-25

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Field circuit control

310 47, 310 50, H02P 516

Patent

active

046895345

ABSTRACT:
The electrically driven hand tool such as hand-operated drilling, milling or sawing machine includes a universal driving electromotor controlled via electric circuits by means of a plurality of switches, the control elements of which are in the form of pushbuttons arranged in a matrix or rectangular array on the top surface of the tool housing. The pushbuttons are illuminated when actuated and include a digital keyboard connected to a microprocessor to enter digital data corresponding to the desired value of speed or torque, and the microprocessor adjusts, via a power circuit, the electromotor to the entered data.

REFERENCES:
patent: 3969721 (1976-07-01), Chadwick et al.
patent: 4085337 (1978-04-01), Moeller
patent: 4088855 (1978-05-01), Emery
patent: 4090116 (1978-05-01), Lippitt
patent: 4249117 (1981-02-01), Leukhardt et al.
patent: 4407692 (1983-10-01), Torbeck
patent: 4447786 (1984-05-01), Saar et al.

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