PIPE WRENCH Russian patent published in 2008 - IPC E21B19/16 

FIELD: construction.

SUBSTANCE: pipe wrench contains frame with gear wheels in it for rotation transmitting to slotted gear 13 from central one, hydraulic oil motor 2, planet gear 3, rotation transmitting unit 1 from hydraulic motor 2 to planet gear 3, transmission throw-over gear, switching on change-gear lever connected with axle 22, distributive valve with holder, distributive valve throw-over gear with throw-over dragging 28, shank 29. Rotation transmitting unit includes chock and distance bushing centered concerning adjusting frame surfaces unit to hydraulic oil motor 2 and planet reducing gear 3. Transmission arbor is made with operation surfaces for rotation transmitting at gearing from hydraulic motor arbor 2 to planet gear satellites 3. In key frame symmetrically concerning section of dissected gear 13 two additional gears are located, installed with ability stable rotation transmitting to dissected gear 13 from central gear. Dissected gear 13 is made with changeable tooth elements. Change-gear-lever 22 is connected with axle with the help of profile joining. Distributive valve is fixed on holder with ability of plunger travel regulation in one moving direction with throw over draft 28. Shank 29 is fixed directly in wrench frame.

EFFECT: improvement of operation reliability of pipe wrench.

9 dwg