System for tightening threaded fastener assemblies

Details System for tightening threaded fastener assemblies System for tightening threaded fastener assemblies

1988-03-18

1990-09-25

Gruber, Felix D.

Boots, shoes, and leggings

318432, 318594, 36457104, 36457108, G05D 1302, G05D 1702, G05F 110

Patent

active

049597973

ABSTRACT:
A threaded fastener assembly tool is affixed to the output shaft of a DC motor, the torque of which is controlled by the current through the windings. An angular position encoder is attached to the shaft. A microprocessor monitors the angular position of the shaft as a function of time and controls a programmable current source which provides current to the windings of the motor. The processor varies the amount of torque applied to the fastener tool as a function of various parameters to control the installation of the fastener and detect defective fastener units.

REFERENCES:
patent: Re31569 (1984-05-01), Eshghy
patent: 4182979 (1980-01-01), Douglas et al.
patent: 4344216 (1982-08-01), Finkelston
patent: 4374351 (1983-02-01), Fishman et al.
patent: 4375120 (1983-03-01), Sigmund
patent: 4375121 (1983-03-01), Sigmund
patent: 4375122 (1983-03-01), Sigmund
patent: 4400785 (1983-08-01), Wallace et al.
patent: 4625291 (1986-11-01), Hormann
patent: 4685050 (1987-08-01), Polzer et al.
patent: 4692674 (1987-09-01), Packard et al.

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