ROLLER BIT (VERSIONS) Russian patent published in 2015 - IPC E21B10/18 

FIELD: process engineering.

SUBSTANCE: invention relates to rock crushers, primarily, drill bits intended for drilling with the use of central flushing assembly. Drill bit comprises body with central stepped channel, cutters secured at bit legs and pipe made of resilient material arranged in said central channel. In compliance with first version, said pipe is composed of two semicircular sectors with top part of one of which provided with corrugated section shifted to pipe outlet side by magnitude making at least OD. In compliance with second version, said pipe is composed of semicircular sectors with their top part has corrugated sections shifted to pipe outlet end side by magnitude making at least its OD. Note also that corrugated section of one of said sectors has crimps on inner and outer surfaces while second sector has crimps only on outer surface.

EFFECT: higher efficiency of drilling.

2 cl, 3 dwg