Torque hold system and method

Details Torque hold system and method Torque hold system and method

1989-04-10

1990-07-03

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173 12, B25B 2314

Patent

active

049381091

ABSTRACT:
Hydraulic tongs, used to screw oilfield tubulars together, are equipped with torque control means which enable the tongs to rotate the tubulars and then gradually apply torque until a preselected torque value is reached, hold the torque at this value a desired period of time and then release the torque. In one form of the invention, a tong control restricts the power of the tong motor to enable low torque rotation while limiting the maximum torque which can be produced by the tong motor. A hydraulic cylinder placed in the tongs' restraining line is controlled to shorten, hold or extend the line. When the line is shortened, the tongs are pulled in a direction which increases the torque to a value above the maximum torque produced by the tong motor. The system allows heavy, powerful tongs to be used to accurately apply and hold a wide variety of selected torque values.

REFERENCES:
patent: 4679469 (1987-07-01), Coyle
patent: 4700787 (1987-10-01), Buck et al.
patent: 4730254 (1988-03-01), Voden

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