DRILLING DEVICE Russian patent published in 2004 - IPC

FIELD: drilling equipment.

SUBSTANCE: device has mast, hoisting mechanism, rotor with inserts, swivel, leading pipe and drilling pipes inside thereof. Device is provided with additional hoisting mechanism, which is connected to leading pipe via stopping ring, moveably mounted thereon, as well to swivel and hoisting mechanism via corbel, and made in form of tackles, placed on both sides of corbel, having fixed and moveable blocks, fixed, respectively, to corbel and mast, and flexible traction means, placed above moveable and fixed blocks and fixed by one end to mast, and by other one - to stopping ring.

EFFECT: higher reliability.

3 cl, 2 dwg