PIPE MEMBER CLAMPING DEVICE Russian patent published in 2006 - IPC E21B19/16 

FIELD: mechanical engineering, particularly connecting or disconnecting pipe couplings or joints, spinning wrenches adapted to connect drilling and casing pipes.

SUBSTANCE: device comprises rotary gear with connector provided with pentahedral profile from inner side thereof and cartridge built in the pentahedral profile. The cartridge has upper and lower discs with four clamping means arranged between them in radial direction. The clamping means are made as shuttle mechanisms comprising bodies and jaws with hard-alloy dies. The bodies are built in guiding cartridges and may perform radial movement during rotary gear rotation. Movable pins are built in clamping device body. Projected pin ends mate projections made in cups. The cups are arranged between cartridge discs and provided with spring. Jaw with die is connected with the body by pin so that after pin disconnection the body may be removed from the guiding cartridge.

EFFECT: increased reliability along with increased load-bearing capacity.

2 cl, 3 dwg