CONE BIT BEARING STRUCTURE Russian patent published in 2006 - IPC E21B10/22 

FIELD: rock cutting tools, particularly bearing structures for cone bits.

SUBSTANCE: bearing structure comprises leg with inclined axle, cutting cone installed on the axle and provided with annular groove, locking unit made as a number of rods installed in radial axle channels so that the rods may cooperate with annular groove walls and with spacing member located in axial channel of the axle. The spacing member is provided with stepped outer surface and conical top. Rod ends arranged in radial axle channels are conical from axle axis side and are semi-spherical from another side thereof. The leg is provided with additional locking unit displaced with respect to main stop unit in axial axle direction. Stepped parts of spacing member are connected with each other by conical part to provide cooperation thereof with additional locking unit rods. Radial channels of main and additional locking unit axles are angularly displaced in plane transversal to axle axis.

EFFECT: simplified design and assemblage, increased operational reliability.

3 cl, 2 dwg