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

FIELD: mining.

SUBSTANCE: invention relates to a rock-breaking tool, in particular, to supports of drilling cone bits, comprising a stepped journal made as a whole with a foot and a cutter fixed on the journal by means of sliding bearings and a retaining rolling bearing. A feature of the proposed support is the fact that a lower part of the journal for a sliding bearing is made with several longitudinal slots, and a journal of larger diameter - with channels connected to slots and serving to hold rollers. Rollers are installed in slots of channels as capable of slippage and aflush with external surface of a journal with smaller diameter. The external surface of the rollers is coated with a material that provides for friction ratio between a cutter and rollers that is higher than a friction ratio between rollers and a journal.

EFFECT: reduced specific loads at a sliding bearing and increased service life of the bearing and the support in general.

3 cl, 2 dwg