Back-up power tongs and method

Details Back-up power tongs and method Back-up power tongs and method

1981-03-13

1983-09-06

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5719, 81 5721, 81 5734, B25B 1700

Patent

active

044022395

ABSTRACT:
Improved back-up tongs are provided for use with powered rotary tongs for making and breaking sections of drill pipe in a drill string. The tongs include a pair of jaw members which are slidably and radially driven into engagement with the drill pipe by levers having one end urgeable against corresponding ones of the jaw members, and having their other end hingedly coupled to a hydraulically driven push rod. Improved means are included for coupling the back-up tongs into close releasable association with the rotary tongs, and are further included for providing a more accurate measurement of the torque being applied to the pipe member during make-up of the drill string.

REFERENCES:
patent: 2667356 (1954-01-01), Forward
patent: 2668689 (1954-02-01), Cormany
patent: 3149851 (1964-09-01), Adams
patent: 3861252 (1975-01-01), Stoffels

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