HYDRO-DRIVEN SUSPENDED PIPE KEY Russian patent published in 2004 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: key has body with two opening sides. In the body a rotary clamping device is placed, consisting of rotor, working and centering jaws. On body, hydraulic distributor and hydraulic motor are placed. Breaking device has roller of resilient material, mounted in central portion of working jaw and interacting with end pieces in case of displacement of hydraulic distributor handle. End pieces have slanted sides and are fixed on inner wall of body on both sides relatively to roller. Working jaw after roller covers side of end piece is stopped and starts moving along pipe. When pipes are screwed apart, roller covers side of other end-piece and working jaw is stopped relatively to other rotor, which allows it to move away from pipe.

EFFECT: higher productiveness.

4 dwg