Torque-indicating wrench

Details Torque-indicating wrench Torque-indicating wrench

2005-09-27

2005-09-27

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Dynamometers

Responsive to torque

Reexamination Certificate

active

06948380

ABSTRACT:
A torque-indicating wrench includes a wrench body with a head to engage and turn a workpiece, and a stem having an inner peripheral wall with longitudinal and transverse wall segments. A strainable body made of a material with an elasticity modulus smaller than that of the stem has an outer peripheral wall which includes front and rear bending force transmitting areas in engagement with and stretchable relative to the front and rear regions of the longitudinal wall segments, and two gage carrying regions and front and rear end regions that are spaced apart from the longitudinal and transverse wall segments, respectively. A strain gage unit is attached to one of the gage carrying regions to detect change in resistance values corresponding to stretching deformation of the strainable body for processing by a processing circuit so as to obtain a value of torque applied to the workpiece.

REFERENCES:
patent: 3970155 (1976-07-01), Otto
patent: 4006629 (1977-02-01), Barrett et al.
patent: 4522075 (1985-06-01), Pohl
patent: 4669319 (1987-06-01), Heyraud
patent: 4976133 (1990-12-01), Pohl
patent: 6463811 (2002-10-01), Putney
patent: 6784799 (2004-08-01), Hsien

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