Torque wrench

Details Torque wrench Torque wrench

1986-04-10

1987-09-29

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

173164, 81470, B25B 1350

Patent

active

046962069

ABSTRACT:
A torque wrench for making and breaking connections between sections of drill pipe. The torque wrench has upper and lower wrench assemblies, each having a gate, a latch, and a clamp. Clamping cylinders apply clamping pressure to the clamps. Torque cylinders apply torque pressure to the upper wrench assembly, to cause rotation of the upper wrench assembly relative to the lower wrench assembly. When the torque pressure is adjusted, a valve causes the clamping pressure applied to the clamping cylinders to automatically vary linearly with the torque pressure.

REFERENCES:
patent: Re28899 (1976-07-01), Himmelstein et al.
patent: 2544639 (1951-03-01), Calhoun
patent: 2720803 (1955-10-01), Rice et al.
patent: 3021739 (1962-02-01), Grundmann
patent: 3696872 (1972-10-01), Jonsson
patent: 3796131 (1974-03-01), Workman, Jr. et al.
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4348920 (1982-09-01), Boyadjieff
patent: 4445402 (1984-05-01), Farr et al.
patent: 4483236 (1984-11-01), Curtiss

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