Electric tool, particularly a handtool, with torque control
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 11, 1984
Grant Date -
N/A
app pub date -
Nov 23, 1982
filing date -
Nov 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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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