JET NOZZLED ROCK BITROLLER BIT Russian patent published in 2015 - IPC E21B10/18 

FIELD: mining.

SUBSTANCE: claimed drill bit comprises legs with inclined pins with toothed cutters fitted thereon by lock bearing, and flushing units and nozzles arranged between said cutters. Drill bit features the nozzle channel outlet section shaped to confuser with hexahedron-like cross-section, said nozzle being locked relative to the body. Note here that said hexahedrons feature the angles of two sizes. Note here that one of vertices of smaller angles is directed to intersection of two adjacent pins of cutters. Two other vertices of smaller angles are directed toward the zone of contact between peripheral rims of entering and leaving cutters and well walls.

EFFECT: higher efficiency of drill bit operation and quality of slime removal from the face.

3 dwg