Power tongs controller with persisting torque

Details Power tongs controller with persisting torque Power tongs controller with persisting torque

1986-03-28

1987-07-14

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

173 12, B25B 23151

Patent

active

046794697

ABSTRACT:
A control system for power tongs comprises two tongs torque limiters, one of which limits tongs torque to a very low (hand-tight) level; the other limits torque at full make-up to, for example, 2000 ft.-lbs. The hand-tight torque limiter is manually or automatically disabled after the hand-tight level is reached. The system enables the operator to verify that the threads are properly engaged before applying full torque to the connection. The tongs have a very high reduction ratio, so that torque rises very slowly and can be more accurately controlled. The high torque limiter includes a normally closed shunt valve in series with an adjustable choke, the latter of which enables one to maintain a substantial, adjustable, residual torque on the pipe even after the shunt valve opens.

REFERENCES:
patent: 3695362 (1972-10-01), Clarkson, Jr.
patent: 4046399 (1977-09-01), Zeuner et al.
patent: 4118149 (1978-10-01), Hagberg
patent: 4305472 (1981-12-01), Brossette

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