US Patent: 4,958,541
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| Electronic torque wrench with tactile indication
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Patentees:
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| 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 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 13, 1989 |
| Granted: |
Sep. 25, 1990 |
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Stan Schulz
Snap-On Tools Company History
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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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