ROLLING CUTTER DRILLING BIT Russian patent published in 2007 - IPC E21B10/22 

FIELD: rock-destroying instruments, namely, rolling cutter drilling bits.

SUBSTANCE: bit contains body with washing system and inclined pivot bolts, on each of which by means of bearings and locking bushing a rolling cutter is mounted with rock-destroying elements. Bushing is made in form of floating slide bearing with circular recess on external surface for interaction with stopping element mounted in the body of rolling cutter. Bushing may be made in form of circular segments, and stopping element - in form of pin, rigidly held in the body of rolling cutter or in form of split-type spring ring, mounted in combined circular grooves of rolling cutter body and locking bushing.

EFFECT: increased efficiency of bit operation and simplified construction of same.

7 cl, 5 dwg