In order to prevent excessive pulling of the mouth of a horse by the reins, control is accomplished by pressure on a nerve above the chin groove of the horse nearer to the neck. The bit has a pair of parallel shanks, each of which has a forwardly curved shank portion slideable in a ring on the end of the mouthpiece which latter may be a chain or broken snaffle. A chin strap connects the tops of the shanks and is located higher than the chin strap on a regular bit. The reins are secured to the lo...

A spade bit is provided of the type particularly adapted to be employed with a hand-type power tool such as an electrical drill or drill press for purposes of cutting through a non-metal material such as wood. The spade bit has basically three main portions, namely, a shank, a blade and a point. In accord with the preferred form thereof, the spade bit is formed as an integral member. The shank of the spade bit has a generally cylindrical configuration with the free end thereof being of polygonal...

A cutter bit, particularly for a coal plough, is retained within a holder by a screw which passes through an aperture in the end wall of the holder.

An impact type of anvil core bit includes a body having a central opening through its bottom drilling face, a plurality of spaced cutters, such as sintered tungsten carbide buttons, being secured to the body and extending downwardly from the face to drill against the bottom of the bore hole outwardly of the central opening, the cutters including inner cutters for forming the core in the bottom of the hole, a cutter ring being secured to the body and circumscribing the opening above the bottom of...

A composite bit or drill having a material working section adhesively connected to an enlarged gripping section. The material working section includes generally a cutting, grinding or finishing portion and continuous therewith a shank portion and is made of hard, abrasion resistant, heat resistant, durable alloys. The gripping section has a relatively large mass and large outer diameter with respect to the material working section and has an accurately formed longitudinal bore therein for receiv...

A snaffle bit comprising a pair of club-shaped bit parts joined together by an intermediate rod-shaped elastic hinge. Rings are connected to the outer ends of the bit parts for receiving the snaffle reins.

A boring bit comprising a hollow body having a cavity therein for the storage of a lubricant, a pair of discharge passages in communication with the cavity for directing the lubricant and a pair of cutting blades mounted in the bit. The body passages are each provided with an aligned straight-walled portion adapted to mount one of the cutting blades. At least two guide rollers are mounted in the body with their axes of rotation lying in planes substantially parallel with the rotational axis of t...

A drill bit for drilling holes in metal sheets or panels in which the drill is of generally conical form having a series of cylindrical drill portions increasing progressively in diameter from the point end of the drill whereby a single drill may be employed to drill holes of various diameters within a given range. The drill has a single flute of generally right-angle form in cross section with the apex of the right angle extending generally along the axis of the bit. Each cylindrical portion ha...

A drill bit including a plurality of roller cutters, each cutter having at least one substantially chisel-shaped circumferential web and hardened inserts positioned therein to allow penetration of the web into the formation being drilled, said inserts having one substantially chisel-shaped end and positioned so that the chisel-shaped surfaces of the web and the inserts present a relatively continuous chisel-shaped surface to the formation. This abstract is neither intended to define the inventio...

A drill bit including at least one roller cutter rotatably mounted on a shaft which is supported between two legs of a saddle wherein the ends of the shaft are non-circular in cross section and fit with non-circular portions on the legs, the shaft being secured to the legs by bolt means passing diagonally through the shaft ends and one side of the mating saddle leg, whereby the shaft may be held against turning with respect to the saddle legs. This abstract is neither intended to define the inve...