Dual string backup tong

Details Dual string backup tong Dual string backup tong

1996-02-28

1998-12-01

Scherbel, David A.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5733, B25B 1350

Patent

active

058423907

ABSTRACT:
A backup tong having an inner throat sized to accommodate a second pipe string while a first pipe string is held within the jaws of the tong is disclosed. The inventive backup tong facilitates operations on dual pipe strings by allowing the tong to grip not only the closer of two pipe strings, but also the farther of the pipe strings by allowing the nearer pipe string to reside in an inner throat of the backup tong, between the gripping members of the tong and the body of the backup tong, while the farther pipe string is held between the gripping members. The inventive backup tong thereby allows the operator to grip either of the pipe strings from a single side, eliminating the side-to-side movement (and corresponding time and risk of harm) which is required when using prior art backup tongs.

REFERENCES:
patent: Re31699 (1984-10-01), Eckel
patent: 2846909 (1958-08-01), Mason
patent: 2989880 (1961-06-01), Hesser et al.
patent: 3196717 (1965-07-01), Sheppard
patent: 3371562 (1968-03-01), Kelley
patent: 3703111 (1972-11-01), Guier
patent: 4246809 (1981-01-01), Keast
patent: 4334444 (1982-06-01), Carstensen
patent: 4357843 (1982-11-01), Peck et al.
patent: 4402239 (1983-09-01), Mooney
patent: 4492134 (1985-01-01), Reinboldt
patent: 4574664 (1986-03-01), Curry
patent: 4590823 (1986-05-01), Neves et al.
patent: 4648292 (1987-03-01), Haynes et al.
patent: 4732061 (1988-03-01), Dinsdale
patent: 4747588 (1988-05-01), Dillhoff
patent: 5060542 (1991-10-01), Hauk
patent: 5644960 (1997-07-01), O'Brien
Weatherford International, Inc., Weatherford Dual Completion Tong, 1990.

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