Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1983-03-21
1985-01-22
Jones, Jr., James L.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 572, B25B 1700
Patent
active
044944250
ABSTRACT:
A backup tong incorporates a self-tightening feature to securely hold a string of tubing stationary while a spinning tong rotates a joint of tubing. The string of tubing is aligned between a moveable jaw and a body jaw of the backup tong. The moveable jaw is journaled for movement about a cam axis that is parallel to the tubing wall. The cam axis is eccentric to a curved face of the moveable jaw so that as the moveable jaw is moved the distance between the jaws changes. Prior to operations of the spinning tong, an air cylinder moves the moveable jaw into contact with the tubing. Rotation is begun and the induced movement of the tubing wall adjacent the moveable jaw toward a backer adjacent the jaws also moves the moveable jaw face toward the backer, thereby tightening the grip of the jaws on the tubing until the tubing is held stationary. A bracket attached to the spinning tongs has a slot therein parallel to the tubing. A post on the backup tong slidably positioned within the slot permits automatic adjustment of the distance between the spinning tong and the backup tong during threading and unthreading and orientation of the backup tong during alignment of the tubing between the jaws.
REFERENCES:
patent: 1198365 (1916-09-01), Manney
patent: 3025733 (1962-03-01), Soodnizin
patent: 3799009 (1974-03-01), Guier
patent: 4372026 (1983-02-01), Mosing
Coffee Wendell
Jones Jr. James L.
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