CONE BIT SUPPORT Russian patent published in 2012 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: support is equipped with a ball step-bearing placed between a bit bottom and a journal end, and an outer surface of a bush is provided with longitudinal slots for rollers. At the same time a bush tail is placed in a circular bore made in a journal of larger diameter. Rollers are installed in bush grooves as capable of rotation and protrude above its outer surface, and the bush is capable of axial displacement and slipping. The bush tail rests against a ball race installed on the circular bore bottom.

EFFECT: simplified design, reduced specific loads at a sliding bearing and increased service life of a support and a bit in general.

3 cl, 2 dwg