Indexing mechanism for an open-head power tong

Details Indexing mechanism for an open-head power tong Indexing mechanism for an open-head power tong

1978-05-01

1979-10-16

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5718, 81 572, 81 5734, B25B 1700

Patent

active

041709080

ABSTRACT:
An open-head power tong having a bifurcated frame defining a central opening and a side opening, a rotatably supported ring having a side opening and which carries releasable pipe engaging jaws that move into and out of the central opening, and a reversible hydraulic motor for driving the ring and the jaws therewith to respectively engage and rotate a pipe in a clockwise and a counterclockwise direction during respective make-up and break-out of a drill string, is provided with a pneumatically operated indexing mechanism which automatically aligns the side openings of the frame and the ring after the termination of a make-up or break-out operation such that a drill pipe, located within the central opening, is permitted to be passed laterally therethrough so as to allow the removal of the tong from the drill string.

REFERENCES:
patent: 2618468 (1952-11-01), Lundeen
patent: 2780950 (1957-02-01), Province
patent: 3180186 (1965-04-01), Catland
patent: 3261241 (1966-07-01), Catland
patent: 4005621 (1977-02-01), Turner et al.
patent: 4060014 (1977-11-01), Turner

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