Electronic torque wrench having a trip unit

Details Electronic torque wrench having a trip unit Electronic torque wrench having a trip unit

2007-11-23

2008-12-02

Shakeri, Hadi (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S479000

Reexamination Certificate

active

07458297

ABSTRACT:
An electronic torque wrench includes a tubular housing having a surrounding wall confining a receiving space, a working unit having a shank portion extending axially into the receiving space and pivoted to the surrounding wall at a pivot point, a strain sensor provided in the working unit, a trip unit having at least one driven element disposed in the shank portion, and a central processor connected electrically to the strain sensor and the trip unit. The driven element is movable to a tripping position, in which the driven element is not pressed tightly against the surrounding wall so that the working unit is permitted to pivot relative to the tubular housing. The central processor controls and moves the driven element to the tripping position when an applied torque measured by the strain sensor is larger than a preset reference torque value.

REFERENCES:
patent: 3577815 (1971-05-01), Bergquist
patent: 4485703 (1984-12-01), Grabovac et al.
patent: 4958541 (1990-09-01), Annis et al.
patent: 5129293 (1992-07-01), Larson et al.
patent: 5435190 (1995-07-01), Jansson et al.
patent: 6070506 (2000-06-01), Becker
patent: 6276243 (2001-08-01), Jenkins
patent: 6722235 (2004-04-01), Hsieh
patent: 6968759 (2005-11-01), Becker et al.
patent: 6981436 (2006-01-01), Becker et al.
patent: 2007/0227316 (2007-10-01), Lucke et al.

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