Power tong with reduced die markings

Details Power tong with reduced die markings Power tong with reduced die markings

2007-07-03

2007-07-03

Meislin, D. S. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C081S057340

Reexamination Certificate

active

10835370

ABSTRACT:
A power tong10rotates a tubular during makeup or breakout of the threaded connection. A tong frame12, a rotatable ring20, and a cage plate assembly may each have an open throat for receiving the tubular. A plurality of dies32are preferentially manufactured from aluminum, and each have a knurled surface for engaging the tubular. A fluid powered cylinder54increases tension between the brake band50and the cage plate assembly. Neutral cam portions of the cam surface one positioned radially outward substantially from the makeup and breakout cam portions.

REFERENCES:
patent: 4084453 (1978-04-01), Eckel
patent: 4089240 (1978-05-01), Eckel
patent: 4291598 (1981-09-01), Cherry
patent: 4357843 (1982-11-01), Peck et al.
patent: 4986146 (1991-01-01), Buck
patent: 5172613 (1992-12-01), Wesch, Jr.
patent: 6050156 (2000-04-01), Buck
patent: 2002/0121160 (2002-09-01), Bangert

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