Method and apparatus for forming tubular connections

Details Method and apparatus for forming tubular connections Method and apparatus for forming tubular connections

2008-02-22

2009-11-24

Thomas, David B (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S057330

Reexamination Certificate

active

07621202

ABSTRACT:
The apparatus of the present invention is directed to a replacement cage assembly (106) to modify a conventional power tong (100) to enable the power tong to grip and rotate smaller diameter tubular segments (90). The method of the invention is directed to modifying a power tong (100) to grip and rotate a tubular segment of a diameter smaller than could be gripped by the unmodified power tong (100). The invention provides a rotary gear insert (240), having an interior second cam surface, rotatably captured intermediate an upper cage plate (230) and a lower cage plate (210) and slidably receivable within the conventional rotary gear of the power tong (100) and to cam and rotate a plurality of replacement gripping jaws (220, 221) pivotally captured adjacent the second cam surface (240) and intermediate the upper cage plate (230) and the lower cage plate (210).

REFERENCES:
patent: 3029673 (1962-04-01), Mitchell
patent: 5207128 (1993-05-01), Albright
patent: 5394774 (1995-03-01), Dlask
patent: 5865073 (1999-02-01), Wilson et al.
patent: 7237456 (2007-07-01), Neves
patent: 2005/0011312 (2005-01-01), Mardian
patent: 2006/0011017 (2006-01-01), Kathan
patent: 2321866 (1998-08-01), None
patent: WO9835873 (1998-08-01), None
Feb. 2, 2008 PCT Written Opinion of ISA for PCT/US2008/054797.

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