Electronic torque wrench

Details Electronic torque wrench Electronic torque wrench

2008-01-01

2008-01-01

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S483000

Reexamination Certificate

active

07313990

ABSTRACT:
An electronic torque wrench includes a head portion, a handle portion connected to the head portion and having a tubular wall that defines a receiving space, a strain sensor unit disposed in the head portion, and an indicator unit disposed in the receiving space and including a rotary member having a rotatable portion, a first indicator connected to the tubular wall, and a second indicator fixed to the rotatable portion. The first and second indicators strike each other to produce a sound when the rotatable portion is rotated. A controlling unit is connected electrically to the strain sensor unit and the rotary member, and actuates the rotatable portion to rotate when the strain sensor unit detects a torque that is larger than a reference torque level.

REFERENCES:
patent: 2924134 (1960-02-01), Harmes
patent: 4641538 (1987-02-01), Heyraud
patent: 4958541 (1990-09-01), Annis et al.
patent: 6070506 (2000-06-01), Becker
patent: 6119562 (2000-09-01), Jenkins
patent: 6276243 (2001-08-01), Jenkins
patent: 6526853 (2003-03-01), Jenkins
patent: 6981436 (2006-01-01), Becker et al.
patent: 2005/0204877 (2005-09-01), Royko

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