Friction grip for tubular goods

Details Friction grip for tubular goods Friction grip for tubular goods

B - Operations, Transporting

66

C

B66C 1/46 (2006.01) B25B 5/06 (2006.01) B25B 13/50 (2006.01) E21B 19/16 (2006.01)

Patent

CA 2065394

The object of the invention is to provide a device for gripping threaded pipe, and like tubular goods, about their outer diameter, and for applying high torqueforces required for assemble and disassembly of threaded connections, without causing any surface deformation or structural deformation to said workpieces. The gripping device has an inflatable flexible liner (3) contained within rigid outer shell (5) Axial splines of internal sleeve (7) mate with corresponding splines of flexible liner (3), and distribute torque forces uniformly throughout flexible liner (3). Intro duction of fluid pressure into annular bladder (8), through port (6), causes the flex- ible liner (3) to deform radial inward and thrust friction sleeve (1) into contact with workpiece (4). Movable anti-extrusion rings (2) prevent deformation of the liner in- to annular space (9), between outer shell (5) and workpiece (4), and also prevent axial wear of flexible liner (3) against outer shell (5).

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