Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1982-11-23
1984-12-11
Yost, Frank T.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
7386231, 7386249, 74412TA, 81469, 338 99, 338103, 338110, 408 9, B25B 2314
Patent
active
044872704
ABSTRACT:
A power tool has an electric motor with a motor shaft having a spiral gear through which the motor drives the tool. A pressure sensor is disposed so as to be subjected to the axial thrust of the motor shaft created by the spiral gear during operation of the tool. A torque control device is connected to the pressure sensor for influencing the motor in response to such axial thrust, for example to control or limit the torque of the motor. Preferably, the pressure sensor comprises a disk of electrically conductive plastic and is located between a thrust bearing of the motor shaft and an axial support therefor. Such disk is disposed between a pressure plate and an electrode plate having spaced apart electrodes.
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patent: 3286776 (1966-11-01), Richison et al.
patent: 3386067 (1968-05-01), Costanzo
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patent: 3834467 (1974-09-01), Fuchs
patent: 4089216 (1978-05-01), Elias
patent: 4188821 (1980-02-01), Elias
patent: 4252391 (1981-02-01), Sado
Black & Decker Inc.
Murphy Edward D.
Phan Hien H.
Sherer Ronald B.
Weinstein Harold
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