BORE BIT Russian patent published in 2009 - IPC E21B10/02 

FIELD: mining.

SUBSTANCE: invention refers to bore bits designed for boring with continuous removal of core material. The bore bit consists of a case with a packering unit on exterior surface, of washing radial and lengthwise channels connected with sludge removing slots on its working end armoured with rock destroying elements. The bore bit is equipped with ejectors in form of bent hubs; the inlet part of each is installed in the lengthwise cleaning channel of the case, while the outlet part is flushed in the bottom of the sludge removing slot in an additional slot. The outlet part of the hub is made with smaller cross section in comparison with the inlet part and is directed to the lengthwise axis of the bit. The inlet part of the hub is equipped with a head, is assembled in the middle part of the sludge removing channel and is set off relative to core forming surface of the bit to periphery. The packering unit of the case is made in form of a screw with right-side winding and of a packing element located above the screw. Such design of the bit increases efficiency of its operation.

EFFECT: increased efficiency of bore bit operation.

3 cl, 2 dwg