04867236 is referenced by 110 patents and cites 20 patents.

Compact casing tongs include a tube which is secured to a connector, the connector in turn being supported and rotated by a quill of a top head drive assembly. The lower end of the tube regidly supports a set of cams which define multiple recesses. A jaw is mounted in each recess, and each of the jaws is connected to a brake ring positioned outside the tube. By externally braking the brake ring while the quill connector body is rotated the jaws are shifted out of the recesses to grip the exterior of a casing positioned within the tube. The tube is dimensioned to ensure that the jaws engage the body of the casing beneath the upper collar of the casing.

Title
Compact casing tongs for use on top head drive earth drilling machine
Application Number
107268
Publication Number
4867236
Application Date
October 6, 1988
Publication Date
September 19, 1989
Inventor
Jerry K Lingafelter
Wichita Falls
TX, US
Keith M Haney
Wichita Falls
TX, US
Agent
Willian Brinks Olds Hofer Gilson & Lione
Assignee
W N Apache Corporation
TX, US
IPC
E21B 3/02
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