Power tongs with improved gripping means

Details Power tongs with improved gripping means Power tongs with improved gripping means

1991-09-16

1992-12-22

Kisliuk, Bruce M.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5711, 81 5714, B25B 1350

Patent

active

051726130

ABSTRACT:
Power tongs and the back-ups are disclosed which have improved means for gripping pipe and tubular members. Torque is applied and held with minimum damage to the pipe or tubular member. A plurality of gripping assemblies, each consisting of a pivoted jaw having a friction surface, are mounted on a drag ring. Rotational resistance is selectively applied to the drag ring to cause the jaws to make contact with or be released from the pipe prior to any torque being applied to the pipe. Various modifications of the gripping assemblies are disclosed to provide better gripping contact with the pipe.

REFERENCES:
patent: 3196717 (1965-07-01), Sheppard
patent: 4060014 (1977-11-01), Turner
patent: 4346629 (1982-08-01), Kinzbach
patent: 4437363 (1984-03-01), Haynes
patent: 4869137 (1989-09-01), Slator

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