Apparatus for precision tensioning of threaded fasteners

Details Apparatus for precision tensioning of threaded fasteners Apparatus for precision tensioning of threaded fasteners

1988-02-01

1989-07-11

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

73761, 7386235, G01L 524

Patent

active

048459984

ABSTRACT:
Apparatus for precision tensioning of threaded fasteners and the like comprising a drive head having a shaft for applying turning torque to a threaded fastener, a strain gage mounted on the drive shaft for providing a torque signal as a function of torque applied to the fastener, and an optical encoder for providing an angle signal as a function of angle of rotation of the fastener. An electronics package includes a microprocessor-based controller, an alphanumeric display for displaying either torque or angle as well as additional operating mode information, and a membrane switch panel for operator selection of angle-monitoring mode, torque-monitoring mode, measurement or setup operating modes, torque display in Newton-meters or foot-pounds, and for programming desired torque and/or angle thresholds into the control microprocessor.

REFERENCES:
patent: 3962910 (1976-06-01), Spyridakis et al.
patent: 4091451 (1978-05-01), Weiner et al.
patent: 4125016 (1978-11-01), Lehoczky et al.
patent: 4259869 (1981-04-01), Carlin
patent: 4608872 (1986-09-01), Mayer et al.

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