Electronic torque wrench

Details Electronic torque wrench Electronic torque wrench

2006-12-11

2008-08-26

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

C073S862080, C073S862230

Reexamination Certificate

active

07415897

ABSTRACT:
An electronic torque wrench includes a head portion, a handle portion connected to the head portion and having a receiving space, a strain sensor unit disposed in the head portion, and an indicator unit disposed in the receiving space and having a moving unit. The handle portion further has a tubular wall with a through hole communicated with the receiving space. The moving unit has a touching member aligned with the through hole and movable between first and second positions, where the touching member protrudes outwardly of and retracts into the through hole, respectively. A controlling unit is connected electrically to the strain sensor unit and the moving unit, and actuates the touching member when the strain sensor unit detects a torque that is larger than a reference torque level.

REFERENCES:
patent: 4958541 (1990-09-01), Annis et al.
patent: 6681663 (2004-01-01), Hsien
patent: 6928885 (2005-08-01), Shiao et al.
patent: 6948380 (2005-09-01), Shiao et al.
patent: 7107884 (2006-09-01), Cutler et al.
patent: 7313990 (2008-01-01), Shiao et al.

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