Tools – Wrench – screwdriver – or driver therefor – Machine
Patent
1987-09-24
1989-03-14
Smith, James G.
Tools
Wrench, screwdriver, or driver therefor
Machine
81 5734, 81 5735, 81 5719, B25B 1350
Patent
active
048116351
ABSTRACT:
An improved powered pipe tong has a frame with a generally central opening and a drive ring with pipe gripping dies arranged for rotation in the opening, about an axis. A fluid powered motor and associated gearing powers the drive ring in either direction about the axis. The dies are closed on pipe to be rotated by energy supplied by a fluid powered ram mounted in the frame and actuated to extend into the drive ring to force pipe gripping dies into gripping contact with pipe. Once the dies are forced into gripping contact with the pipe they are locked in position and the fluid powered ram is withdrawn into the frame to allow the drive ring to rotate with gripped pipe. The lock that holds the dies in closed gripping position while the drive ring rotates can be released in any position of rotating parts. The drive ring is then rotated into position for the ram to again apply force to drive ring mounted parts. If the tong has a side opening, or gap, the ram is in position to apply force when the ring and frame gaps are aligned.
REFERENCES:
patent: 3021739 (1962-02-01), Grundmann
patent: 4631987 (1986-12-01), Buck
patent: 4649777 (1987-03-01), Buck
Cruz Lawrence
Jeter John D.
Smith James G.
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