Power tong and back-up tong assembly

Details Power tong and back-up tong assembly Power tong and back-up tong assembly

1982-02-25

1984-05-01

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Machine

173164, B25B 1700

Patent

active

044454023

ABSTRACT:
A power tong and back-up tong assembly is comprised of a power tong having a rotatable cam surface which cooperates with jaw assemblies to grip and rotate a first pipe and a back-up tong having a fixed cam ring and jaw assemblies which are rotated against the cam ring in the same direction as the cam surface of the power tong rotates until an initial grip is achieved on a second pipe which is to be held while the first pipe is threaded or unthreaded relative thereto.

REFERENCES:
patent: 2544639 (1951-03-01), Calhoun
patent: 2650070 (1953-08-01), Lundeen
patent: 2668689 (1954-02-01), Cormany
patent: 2705614 (1955-04-01), McKibben
patent: 2760392 (1956-08-01), Paget
patent: 3025733 (1962-03-01), Soodnizin
patent: 4082017 (1978-04-01), Eckel
patent: 4084453 (1978-04-01), Eckel
patent: 4246809 (1981-01-01), Keast et al.
patent: 4333365 (1982-06-01), Perry

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