Charles H Calhoun

US Patent:

41990323, Apr 22, 1980

Filed:

Feb 17, 1978

Appl. No.:

5/878643

Inventors:

Peter D. Weiner - Woodlands TX
Charles W. Calhoun - Jackson WY

Assignee:

Weatherford/Lamb, Inc. - Houston TX

International Classification:

B23Q 5027
B23Q 5033

US Classification:

173 12

Abstract:

An apparatus for measuring and controlling a force such as torque, pull or weight. One example is an apparatus for making up two members having mating threaded connections, such as pipe joints, head bolts and all types of threaded fasteners for insuring that a specified torque has been applied. A comparator compares the measured torque with a desired torque value and disengages the making up of the joint when the measured torque exceeds the selected torque. A testing circuit is provided for applying a test value for testing the operation of the apparatus in the absence of actual measured torque. An adjustment circuit adjusts the output to conform with a known test value. An adjustment is provided to compensate for the length of the torque arm at which the torque measurement is made.