Electric tool with microcomputer

Details Electric tool with microcomputer Electric tool with microcomputer

1980-07-21

1983-10-18

Dobeck, B.

Electricity: motive power systems

With signals, meters, recorders or testing devices

318305, 318327, 364474, 340680, H02P 728

Patent

active

044108460

ABSTRACT:
Speed regulation, either closed loop or open loop, in a hand-held electric tool such as a drill, a miller, a saw or, in particular, combination tools for home use, is carried out by use of a microcomputer. Then-present operating conditions such as the speed of the drill bit, the direction of rotation of the bit, the presently engaged gear, etc. are indicated by a display which has a plurality of fields which are selectively lit. Alternatively, the display can include a seven-segment indicator for displaying the speed. Overload indication is also furnished, as is an automatic shutoff when the motor current exceeds its nominal value. The display, overload indication and shutoff, etc. are all computer-controlled.

REFERENCES:
patent: 4027546 (1977-06-01), Alessio
patent: 4211967 (1980-07-01), Aklyama et al.
patent: 4249117 (1981-02-01), Leukhardt et al.
patent: 4267914 (1981-05-01), Saar
patent: 4268783 (1981-05-01), Murray
patent: 4307325 (1981-12-01), Saar
patent: 4317176 (1982-02-01), Saar et al.

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