A drill bit having a shank provided with portions of different cross-sectional configuration to enable use of the bit in conventional chucks having either two, three or more jaws.

The invention concerns a bit of the percussion type having a bit body with slots for receiving hard blocks, such as cemented tungsten carbide blocks. The slots taper outwardly toward the bottom and the blocks also taper outwardly toward the bottom and are introduced endwise into the slots, preferably with an interference fit. Keys are provided for locking the blocks in the slot.

A bridle bit including a bit member having its outer ends coupled to a pair of bow-shaped connector members journaled to the shafts of a pair of rein lever members to permit free pivotal and elevational movement of the bit member in the horse's mouth. The bow-shaped members are connected to sleeves journaled on the rein lever shafts and are adapted to be vertically adjusted on the shaft and retained in the adjusted positions by the corresponding placement of tubular spacer members on the shaft, ...

A drill bit having a body and cutting teeth projecting endwise from the body, each of the cutting teeth having a cutting face at its extremity remote from the body, at least certain of the cutting teeth extending laterally to the periphery of the body, the lateral ends of such cutting teeth at the periphery of the body being inclined from the periphery of the body inwardly, normally at an angle between about 120.degree. and about 150.degree. , preferably at an angle of about 135.degree. , to the...

A drill bit for connection on a drill string has a hollow tubular body with an end cutting face and an exterior peripheral stabilizer surface with cylindrical sintered carbide inserts positioned therein. Nozzle passages extend from the interior of the bit body through the cutting face for receiving a removable and interchangeable nozzle member therein. The cutting face has a plurality of recesses therein which receive, by an interference fit, a plurality of cutting elements of the type known as ...

A design for a drill bit (10) is provided. The design permits placement of a plurality of cutters (14) in a pattern approaching an ideal equal volume cutting arrangement while minimizing the mathematical steps necessary to calculate the desired positions. The design positions the cutters so that the annular area between radially adjacent cutters is a constant. Certain groups of cutters can also be positioned to prevent a central core in the material drilled and to provide a desired kerf overlap.

In a diamond impregnated bit scourer particles in the form of silicon carbide are added to the matrix. The mesh size of the silicon carbide is less than that of diamond and the concentration preferably about 40, if the diamond concentration is 40.

A self-feeding, self-aligning drill bit includes a working end with a cylindrical portion having a desired cutting diameter and a conical threaded portion extending therefrom terminating in a threaded tip. The diameter of the threaded portion increases from the tip toward the cylindrical portion such that it approaches the diameter of the cylindrical portion at their juncture. One or more flutes extend longitudinally through both the cylindrical portion and the threaded portion to form one or mo...

A cutter bit wherein the dust collection openings are formed diametrically opposite each other, on an axis transverse to the longitudinal central axis of the bit body, and at least partly in the tapered dust control surfaces. The junctions of the heel surfaces and dust control surfaces define a pair of crown lines being parallel to one another and in planes which intersect the carbide insert in oblique fashion.

A full bore drag type well drilling bit including a bit body comprised of a generally non-frangible metallic material. The bit body has an operating end face defined by said metallic material to include a plurality of upsets each having a leading edge and at least one recess extending through such leading edge into said metallic material. The end face further includes a plurality of flow paths, each of the leading edges of the upset having one such flow path extending therealong and inset theref...