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US Patent: 4,958,541
Electronic torque wrench with tactile indication
Patentees:
Jeffrey R. Annis (exact or similar names) - Waukesha, WI
Timm R. Herman (exact or similar names) - Kenosha, WI
Ronald T. Strobel (exact or similar names) - South Milwaukee, WI

USPTO Classifications:
81/479

Tool Categories:
wrenches : torque wrenches

Assignees:
Snap-On Tools Corp. - Kenosha, WI

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Oct. 13, 1989
Granted: Sep. 25, 1990

Patent Pictures:
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Snap-On Tools Company History
Description:
Emrich & Dithmar - patent attorneys

Abstract

An electronic torque wrench has a hollow handle portion in which are disposed a DC motor mechanically coupled to the handle portion with a mass eccentrically mounted on its shaft, a control circuit for the motor and a battery for powering the motor and the control circuit. A strain sensor on the wrench produces an output signal when the torque applied to a workpiece equals or exceeds a predetermined torque level for causing the control circuit to actuate the motor to vibrate the handle portion and provide a tactile indication to the user.

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