Measuring and testing – Dynamometers – Responsive to torque
Patent
1996-07-17
1997-09-16
Noland, Thomas P.
Measuring and testing
Dynamometers
Responsive to torque
B25B 2100
Patent
active
056683286
ABSTRACT:
A system for tightening a threaded fastener with a hydraulic wrench has a pumping unit which measures parameters representative of the torque applied to the fastener and the angle of advance of the fastener, remote from the wrench. The pump measures pressure as a parameter representative of torque and measures flow rate, pump speed (for a fixed displacement pump), or time (for a fixed displacement pump driven at constant speed) as a parameter representative of the angle of advance of the fastener. A ratchet-type hydraulic wrench is used, and the pressure versus angle data produced in tightening a fastener is manipulated to discard irrelevant portions and smooth relevant portions to provide data representative of torque and angle during the tightening process from which to determine a final stopping parameter for terminating tightening. The system also has a calibration fixture for determining the volumetric rate of angle advance for a given wrench. Any tightening methodology dependent upon angle may be used to practice the invention, or the invention may be applied to monitor the tightening process.
REFERENCES:
patent: 4104778 (1978-08-01), Vliet
patent: 4106176 (1978-08-01), Rice et al.
patent: 4137800 (1979-02-01), Austin
patent: 4361945 (1982-12-01), Eshghy
patent: 4768388 (1988-09-01), Fader et al.
patent: 4791838 (1988-12-01), Bickford et al.
patent: 4823616 (1989-04-01), Tabmini
patent: 4864903 (1989-09-01), Bickford et al.
patent: 4941362 (1990-07-01), Tambini
patent: 4961035 (1990-10-01), Inaba et al.
patent: 5315501 (1994-05-01), Whitehouse
Knutson Dale A.
Miller Douglas P.
Steber George R.
Applied Power Inc.
Biegel Ronald
Noland Thomas P.
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