ROLLER BIT (VERSIONS) Russian patent published in 2015 - IPC E21B10/16 

FIELD: mining.

SUBSTANCE: roller bit comprises the body with bores wherein hard-alloyed inserts with stems are secured. In compliance with the first version, it differs from know designs in that body bores and insert stems in vertical planes are shaped to the right and inverted cones with the angles at the vertex of 2-20 degrees. Note here that cavities composed between their lateral surfaces feature the right cone shape at lower part and meant for accommodation of sleeves from elastic material each of said sleeves being provided with the cavity filled with incompressible fluid at working position. In compliance with the second version, it differs in that sidewalls of the body bores and insert stems have circular grooves. Said grooves are shifted in vertical plane from the bottom of bores and stem ends to make therewith a toroidal cavity to house said sleeves from elastic material. Each of said sleeves has the cavity filled with incompressible fluid at the working position.

EFFECT: simplified fabrication.

2 cl, 4 dwg