Power tongs and clamping units therefor

Details Power tongs and clamping units therefor Power tongs and clamping units therefor

1987-03-09

1988-03-22

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5733, 81 5719, B25B 1350

Patent

active

047320613

ABSTRACT:
A power tong has upper and lower clamping units mounted in a suspended support frame. Each clamping unit has pipe clamping jaws that move rectilinearly, and are actuated by a pressure fluid operated linear actuator. The lower clamping unit is rigidly secured to the supporting frame and the upper clamping unit is rotatable relative to the lower clamping unit. The relative rotation in both directions is accomplished by a remote powered actuator.

REFERENCES:
patent: 3308691 (1967-03-01), Guier
patent: 3500708 (1970-03-01), Wilson

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