Programmable pulsed torque recovery system

Details Programmable pulsed torque recovery system Programmable pulsed torque recovery system

1990-03-05

1992-03-10

Rosenbaum, Mark

Tool driving or impacting

Processes

173 5, 73761, 81469, B23Q 500

Patent

active

050943014

ABSTRACT:
A method and apparatus for recovering torque lost due to joint relaxation in threaded fastener assemblies or joints. The present invention is especially adapted for use with medium-to-short or gasketed joints. In the practice of an exemplary embodiment of the invention, the torque of an electric nutrunner is pulsed at the end of a fastener tightening cycle between programmed maximum and minimum torque values which have been selected to overcome the static to dynamic torque ratio of the joint while maintaining the motor and gearing of the nutrunner in a loaded condition to ensure maximum nutrunner durability.

REFERENCES:
patent: Re31569 (1984-05-01), Eshghy
patent: 2569244 (1951-09-01), Larson
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4016938 (1977-04-01), Rice
patent: 4019589 (1977-04-01), Wallace
patent: 4074772 (1978-02-01), Jonsson
patent: 4084487 (1978-04-01), Wallace
patent: 4121670 (1978-10-01), Antipov et al.
patent: 4147219 (1979-04-01), Wallace
patent: 4544039 (1985-10-01), Crane
patent: 4908926 (1990-03-01), Takeshima et al.

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