CORE EXTRACTING ENGINE Russian patent published in 1995 - IPC

FIELD: mining, drilling. SUBSTANCE: core extracting engine has a stator with rubber facing, hollow rotor, body, and spindle. The spindle has hollow shaft with ball bearings, protected with seals. Hollow rotor is connected with hollow shaft through a torsion provided with holes. Head of removable core lifter is rested on bearing. Channels for liquid passing, holes and ring slot are there in the bearing. U-shaped rubber ring and thrust metal disk are placed in the slot. Sealing upper end of hollow rotor consisting of U-shaped rubber ring with vertical degree of freedom in the ring slot of the bearing, and thrust metal disk with vertical degree of freedom and restricted horizontal one is provided in core lifter bearing. EFFECT: increased engine capacity, decreased core vibration, absence of seizing core lifter with bearing, increased efficiency in drilling. 2 dwg