Power tong gripping ring mechanism

Details Power tong gripping ring mechanism Power tong gripping ring mechanism

1997-11-10

1998-12-08

Scherbel, David A.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5734, 81 5718, B25B 1350

Patent

active

058455493

ABSTRACT:
A multi-sectioned, bidirectional gripping ring for a closed-head power tong is disclosed of the inventive gripping ring have an open position in which a pipe may be placed within or removed from the gripping ring and a closed position in which the gripping ring completely encircles the pipe. The inventive gripping ring uses radially moveable dies in circumferentially moveable die carriers to grip the pipe. The dies are synchronously moved in the radial direction to grip or release the pipe by changing their circumferential position with respect to the cams in the gripping ring housing.

REFERENCES:
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patent: 4404876 (1983-09-01), Eckel
patent: 4492134 (1985-01-01), Reinboldt
patent: 4590823 (1986-05-01), Neves et al.
patent: 4836064 (1989-06-01), Slator
patent: 5060542 (1991-10-01), Hauk

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