Preexisting torque measuring device for threaded fasteners

Details Preexisting torque measuring device for threaded fasteners Preexisting torque measuring device for threaded fasteners

1987-03-27

1988-09-06

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73761, 364508, B25B 23142

Patent

active

047683880

ABSTRACT:
A method and apparatus for accurately determining the previously applied torque to a threaded fastener. Torque is increasingly applied to the fastener and measured periodically. The measurements are digitized and stored in a microprocessor. The torque previously applied is the torque that causes the fastener to breakaway or start to begin to turn. This breakaway point is the torque corresponding to a change in the slope of the applied torque-time relationship. The breakaway point is determined by determining the maximum different value between the measured torque and a mathematical line segment commencing from below the breakaway point and extending to the peak torque applied. The breakaway point (or applied torque) is the torque corresponding to the calculated maximum difference value.

REFERENCES:
patent: 4450727 (1984-05-01), Reinholm et al.

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