PCT No. PCT/US79/00133 Sec. 371 Date Mar. 5, 1979 Sec. 102(e) Date Mar. 5, 1979, PCT Filed Mar. 5, 1979 PCT Pub. No. WO 80/01927 PCT Pub. Date Sept. 18, 1980 A router bit assembly (18,22) for the sides (20,24) of the bowl (10) of an earthmoving machine (12). The router bit assembly is of two-piece construction and includes a router bit (42) and a holder (26) which, when secured to the vertical side walls (20,24) of the bowl (10), captures the bit (42) between the holder (26) and the vertical sid...

A drill bit consisting of a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, the mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, the main body member having an enlarged annular portion adjacent the annular mounting edge, the enlarged portion of the main body member having a plurality of circumferentially spaced recesses disposed at an angle rela...

A drill bit having a hollow shank, a cutting element and a mounting bridge supported in diametrically opposed cutouts at one end of the shank. The bridge is U-shaped in cross section with a base and spaced parallel legs perpendicular to the base. The cutting element is mounted in the bridge with the inner surfaces of the parallel legs of the bridge embracing a portion of each face of the cutting element and the bottom edge of the cutting element resting on the base of the bridge to support the c...

An improved lubrication and seal system for a rock bit that includes a bit body arranged to be connected to a drilling string or the like and having an axle portion thereon. A cutting member is journaled on the axle portion and provides a cavity between the axle portion and cutting member in which there are disposed a bearings for rotatably supporting the loads on the cutting member on the axle portion. A pressurized fluid passageway extends through the bit body to the cavity for transmitting be...

The device described herein comprises a bit for drilling oil wells, water wells, foundation sockets for bridges and buildings, air and utility shafts for mines, etc., which bit comprises an inner core or mandrel and an outer shell or exterior sleeve, which shell or sleeve is replaceable when worn. The inner core resembles in many features, the standard type of bit in present use in that the means for holding, supporting and driving the bit are similar to those in present practice, and has approp...

A drill bit comprises a body of a cylindrical shape having a straight groove of a generally V-shape formed in the circumferential surface thereof and extending along the longitudinal axis thereof. The bit body has a drilling fluid passageway extending longitudinally therethrough. One of the two side faces defining the longitudinal groove has a radially inwardly-disposed convex surface of a semi-cylindrical shape and a flat surface extending radially outwardly from the semi-cylindrical surface of...

A bridoon bit is provided with a thickened center portion having a curved lateral axis, and with end portions outwardly thereof having an opposite curvature in order that the bit may best conform to the anatomy of a horse's mouth, avoiding pressure points and preventing the horse's mouth from becoming insensitive.

A drill bit with cutting teeth for drilling in rock comprising: a core member having raceways for rolling elements for rotation of the drill bit, a supporting layer exteriorly shaped to define cutting teeth and formed of highly compacted sintered powder material of substantially 90% density, isostatically bonded to said core member, a wear resistant layer applied by thermal spraying and covering only the portions of the cutting teeth which upon drilling directly contact the rock, said wear resis...

A rotary boring bit for boreholes comprises a body provided on its outer periphery with cutting members (6) consisting of a cutting portion (8) and a supporting portion (7), each cutting member being formed as a segment of a sintered body (1) having a core (3) of cutting material encased by a shell (2).

As a material for bit legs, cutters, bearings and ring seals in a bit for drilling igneous rock steel is used which consists essentially in weight % of: 0.10 to 0.20 C; up to 0.5 Si; up to 1.0 Mn; 3.0 to 5.0 Cr; 0.8 to 2.0 Mo; 0.10 to 0.70 V; and the balance being Fe, and is used after its surface layer is hardened by a carburizing process.