ROLLER BIT Russian patent published in 2001 - IPC

FIELD: tools for drilling of wells of various applications, particularly, roller bits. SUBSTANCE: roller bit has a leg with inclined axle on it, cone installed with the help of support made of two parts on axle. Each part of support is made of three rows of rings of various diameters with longitudinal grooves on opposite surfaces contacting with one another. Projections of one part are located in grooves of the other part. Cone is made for its disassembly and replacement. Beads are made on ends of each row of rings. Axle is cross-shaped and support part installed on axle has internal cross-shaped cavity. EFFECT: higher wear resistance of supports and increased service life of roller bit due to exclusion of bearings from its design, change of support working member, lubrication system and assembly of cones to observe principle of equal durability of all parts of roller bit. 3 cl, 5 dwg