Rotary for a power tong

Details Rotary for a power tong Rotary for a power tong

1991-12-11

1992-11-03

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 573, 81 5744, 173218, B25B 1700

Patent

active

051598604

ABSTRACT:
A rotary for a power tong which, in one aspect, has a master piston and cylinder which, when actuated, delivers hydraulic fluid to one or more slave hydraulic piston and cylinders which apply one or more active jaws against a pipe. The master piston and cylinder can be depressed by a plunger mounted on top of the tong housing and the active jaws can be released by opening one or both valves mounted on the rotary and actuable by depressing a ring mounted on the top of the tong housing.

REFERENCES:
patent: 2453369 (1948-11-01), Grable et al.
patent: 3021739 (1962-02-01), Grundmann
patent: 3371562 (1968-03-01), Kelley
patent: 3589742 (1971-06-01), Flick
patent: 4082017 (1978-04-01), Eckel
patent: 4092881 (1978-06-01), Jurgens et al.
patent: 4280397 (1981-07-01), Peveto
patent: 4727781 (1988-03-01), Yuehui et al.
patent: 4836064 (1989-06-01), Slator
patent: 5081888 (1992-01-01), Schulze-Beck
1990-91 General Services and Products Catalog Weatherford, 1989.

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