Abstract: This invention relates to a double composite structure comprising cemented carbides embedded in an austenitic stainless steel matrix forming a wear, impact, drill and corrosion resistant shape by powder metallurgy techniques. Molten metal is then cast around the composite structure forming the body of a tool, lock or parts which are particularly useful for earthmoving and security applications.

Abstract: Disclosed is a cutting tool assembly having a hard, wear resistant insert, a shim and a blade body. The shim has a rearwardly extending recess for receiving the insert. The insert abuts against a top, bottom and rear portion of the shim recess. The shim recess tapers toward the open end of the shim recess to springingly hold the insert. The blade body has a downwardly and rearwardly extending recess on a first end for receiving the shim and insert. The blade body recess is also inclined to the longitudinal axis of the blade body. The blade body recess tapers toward the blade body so as to wedgingly hold the shim and insert.

Abstract: Disclosed according to the invention is a center vacuum roof drill bit. The roof drill bit has a body having an axis of rotation, a seat transverse to the axis of rotation, a periphery and a forward working end. The roof drill bit has at least one flat-like insert positioned on the seat. There is also means for releasably clamping the insert, the means clamping the insert near the periphery only of the body. In other embodiments of the roof drill bit, there is a second flat-like insert and, additionally, provisions are made for self centering the insert or inserts.

Abstract: A milling cutter having a cutter body rotatable about its central axis with a peripheral wall on the cutter body and insert pockets and clamp recesses located in the peripheral wall. The insert pockets have locating surfaces for positioning an insert when placed in the pocket. There is also a clamp for releasably clamping an insert when the insert is placed in position in the pocket. The clamp freely assumes an orientation identical to that of the insert so that planar contact is made with the insert.

Abstract: A dual phase silicon aluminum oxynitride material comprising a first phase Si-Al-O-N, commonly referred to as .beta.-Si-Al-O-N, and a second phase Si-Al-O-N referred to as .alpha.-Si-Al-O-N. In addition to the double phase Si-Al-O-Ns, there is included a glassy type material which can formulate up to ten percent by weight of the total composition. The material may be manufactured by forming a polytype material made from reacted alumina, aluminum nitride and silicon nitride. The polytype material may be mixed with further powders of silicon nitride and an oxide of yttrium, lithium or calcium and finally reacted to a double phase Si-Al-O-N material where hardness is increased as the additional .alpha.-Si-Al-O-N is increased without significantly affecting its strength.The material may be formed in situ by mixing aluminum nitride, alumina, silicon nitride, together with an oxide of yttrium, lithium or calcium. These materials can then be sintered to a final product containing a double phase Si-Al-O-N.

Abstract: Disclosed is a boring tool resistant to vibration. There is a boring bar having a central bore at one end and a boring bar head for attachment to the boring bar at the one end. Inserted in the bore is a tuned absorber package for eliminating vibrations in the boring tool. The tuned absorber package is self-contained and is transferable between boring bars. Also disclosed is a method of reducing vibrations in the boring tool.

Abstract: Disclosed according to the present invention is a two-prong rotary drill bit, especially for use with roof drills. The two-prong bit has a supporting body having an axis of rotation. The two-prong bit has a pair of inserts, one insert on each of the prongs. Each of the inserts has a cutting portion facing in the direction of rotation and a mounting portion. When viewed in a direction parallel to the axis of rotation, each of the inserts will have a cross sectional configuration which is generally wedge-shaped. Also disclosed are wedge-shaped inserts especially for use with roof drill bits.

Abstract: Disclosed is a single-pass notching and drilling tool. The tool comprises an adaptor having a first threaded end for coupling with a power source, an opposed second threaded end, an enlarged diameter portion adjacent to the first threaded end and having a first abutment face and a mediate portion adjacent to the first axial abutment face and adjacent to the second threaded end. There is also a drill portion joined to the second threaded end of the adaptor and having a second axial abutment face. The tool further comprises a notching tool comprising a body having a central bore rotatably engaging the mediate portion of the adaptor. The notching tool is freely rotatable about the mediate portion independent of the rotation of the adaptor. The axial movement of the notching tool is bounded by the first and second axial abutment faces. Disclosed also is a method of drilling a blast hole with the single-pass notching and drilling tool.

Abstract: There is disclosed a base and block assembly for use with an earthworking bit. The assembly comprises a base and a block engaged in the base. The block has a shank portion and a toolholder portion extending from a first end of the shank and adapted for receiving the earthworking bit. The assembly also comprises means for causing the block to preferentially fail when exposed to abnormally high cutting loads. Also disclosed is a method for protecting the base of a base and block assembly when in use with an earthworking bit. The method comprises preferentially weakening the block so as to cause the block to fail when exposed to abnormally high cutting loads and engaging the block with the base.

Abstract: A flowable material, or slurry, comprising a liquid vehicle and solid particulate material dispersed therein which will flow out flat in the form of a sheet. The material, upon exposure to the atmosphere, and either with or without the application of heat, will set up in a dimensionally stable form and can, thereafter, be sintered to form a solid article. The fraction of the vehicle of the composition which remains after the solvent evaporates, vaporizes during sintering and the final product consists only of the particulate material in sintered form.

Abstract: A cutting insert within indexable cutting edges with a chipbreaker configuration which comprises discrete recesses spaced along the length of the cutting insert. The cutting insert has a descending wall that joins the cutting edge or the land behind the cutting edge with a planar floor that extends toward the center of the insert. The recesses are formed in the descending wall adjacent the cutting edge or land behind the cutting edge and are concave facing outwardly as they extend inwardly of the insert. The inserts are coated, preferably, with a TiN over TiC chemical vapor deposition coating.

Abstract: This invention relates to mixtures of tungsten carbide, niobium metal, and molybdenum metal powders for use in the hardfacing of drill pipe couplings used in earth boring operations. It has been found that the addition of small amounts of niobium metal alone, or in combination with molybdenum, are effective to substantially submerge the tungsten carbide particles in the weld pool produced during hardfacing while, also, minimizing the occurrence of cracks which may be produced as the weld pool freezes.

Abstract: A toolholder for releasably holding an indexable cutting insert is described. The insert is locked onto an insert receiving pocket on the toolholder by a locking pin whose head clamps against an upwardly facing wall in a tapered central aperture through the insert. The pin is threadably engaged to the toolholder and is configured so as to allow itself to tilt outwardly, after the insert is unclamped, allowing the insert to be removed from the pin and the insert pocket.

Abstract: A toolholder for releasably holding an indexable cutting insert is described. The insert is locked onto an insert receiving pocket on the toolholder by a locking pin whose head clamps against an upwardly facing wall in a tapered central aperture through the insert. The pin is threadedly engaged to the toolholder and is configured so as to allow itself to tilt outwardly, after the insert is unclamped, allowing the insert to be removed from the pin and the insert pocket.

Abstract: An adjustable insert cartridge is described in which a toolholder shank is threadedly engaged in a threaded adjusting sleeve having a flange with a rearwardly facing face. The rearwardly facing face is in rotatable sliding engagement with a forwardly facing face on a mounting collar which is attached to a boring bar. The rearwardly and forwardly facing faces are held in abutment by a spring which is compressed between a rear face of the mounting collar and an adjusting ring threadedly engaged on the adjusting sleeve.

Abstract: Disclosed herein is a new method and improved apparatus for digging and mining earth formations, especially coal formations. A mining or excavating machine having a movable frame with a drive means mounted on the frame is provided with a rotatable structural member and a rotatable cutter support having cutter bits mounted thereon. The structural member is rotatably mounted on the frame and connected to the drive means so as to be driven in one direction of rotation about a longitudinal axis of the structural member. The rotatable cutter support assembly with the cutter bits mounted thereon is rotatably mounted on the structural member and is freely rotatable about its longitudinal axis. The mining machine is then positioned so that the cutter bits will reduce the mineral formation by driving the structural member in one direction of rotation about its longitudinal axis.

Abstract: An extrusion punch, especially for use in a back extrusion process, wherein a hard wear resistant material is joined on one end to a steel punch body. The hard wear resistant material is joined on at the tip of a steel body so as to prevent wear due to abrasion on the punch caused by the material being extruded in a die means. The hard wear resistant end cap on the tip of the steel body is joined so that it may easily and quickly be replaced when the punch is in position on the machine thereby providing less down time for maintenance on the extrusion press. The method of joining the hard wear resistant end cap to the steel body minimizes the conditions which tend to fracture hard wear resistant material.

Abstract: This invention relates to an adjustable floating boring bar cartridge having indexable cutting inserts mounted on it. Two indexable cutting inserts are mounted on a cartridge such that one is held in a fixed position in one lateral face of the cartridge while the other is held in an opposite face of the cartridge such that it can be adjusted laterally inward and outward.

Abstract: A blast hole drill bit is disclosed for forming longitudinally extending grooves in already drilled blast holes, having a body with a forward face and a rearwardly extending pilot diameter. One or more radially extending wings are located at the rearmost part of the pilot diameter and are V-shaped when viewed in plan. Wear resistant compacts form a part of the wings and have a V-shaped cutting edge.

Abstract: A toolholder for holding a cutting insert having an axial hole is disclosed having a pocket therein for seating of the insert and a hole in the toolholder extending transversely through the bottom of the pocket. A pin having a head for engaging the insert and a pivotal shoe member cooperate in the hole such that, as the rotatable pin is tightened, the shoe member forces the head of the pin to tilt toward a side wall of the pocket and clamp the insert to the toolholder.