REVERSIBLE MECHANISM OF FISHING TOOL Russian patent published in 2001 - IPC

FIELD: oil, gas and mining industries. SUBSTANCE: invention is designed to liquidate emergencies in holes. It namely refers to gear changing direction of rotation of fishing tool. Reversible mechanism includes driving shaft, anchor and planetary reduction gear having body, satellites. Space housing compensator mounted for axial movement is located in upper part of planetary reduction gear, on location surface with anchor. External surface of lower part of body of reduction gear has holes plugged on one side. On other side these holes are connected to oil space located in central part of body. Satellites are placed in oil space. Oil space and space with compensator intercommunicate. Compensator houses rings to seal surfaces of anchor and body. EFFECT: increased operational reliability of mechanism thanks to placement of compensator in planetary reduction gear which provides protection of members of reversing gear against growing hydrostatic pressure while reversible mechanism is sunk into hole. 2 dwg