Abstract: A novel and improved cemented carbide composition, particularly for tools and other wear products, is provided comprising about 62% to 90% titanium carbide, about 0% to 10% nickel, 0% to about 25% other suitable carbides selected from the group of Mo.sub.2 C, TaC, HfC, NbC, VC, WC and Cr.sub.3 C.sub.2, and about 10% to 38% stainless steel binder. The light weight composition provides an improvement in the combined properties of hardness, toughness, strippability, corrosion resistance and wear resistance.

Abstract: A quick release, high torque coupling for interconnecting the bit and drive member in a mine roof drill has axial-locking and torque-transmitting structure integral with the drill members. A plug on the drive member is adapted to be releasably received within a mating socket in the bit and has an axial-locking segment on its outermost end complementally configured with respect to an acircular constriction in the socket to permit insertion of the axial-locking segment into the socket beyond the constriction. A torque transmitting segment on the plug cooperates with the constriction to limit relative rotation of the bit and drive member between oppositely directed torque-transmitting positions. In one of the torque-transmitting positions, the constriction and axial-locking segment are misaligned such that the plug is restrained against axial retraction from the socket.

Abstract: A cutter insert presenting eight positive cutting edges has a generally rectangular prismatic configuration to permit its securement in a tool holder having a conventional square insert-receiving pocket. The insert has a pair of opposed primary faces, and four rectangular side faces each having a pair of coplanar, flat lands in opposite corners thereof to permit positive location and clamping of the insert. Each side face also has a laterally opposed pair of positive beveled facets formed therein and intersecting the respective primary faces to define neutral cutting edges for the insert. An elongate groove extends intermediate the beveled facets of each side face parallel to the neutral cutting edges and functions as a chip breaker to provide freer cutting and better chip control. In preferred forms, a square pocketed tool holder is complementally configured to advantageously support the cutter insert in a manner to present a negative angle of attack at the work surface.

Abstract: An assembly for a cutting tool is disclosed comprising an upper body portion with a slot therethrough, a cutter tool insert disposed within the slot and a tapered pin disposed within a tapered aperture in the cutting tool in non-yielding, frictional engagement with a bottom surface of the insert.

Abstract: A draw or ironing die assembly includes a housing having a minimum modulus of elasticity of 50,000,000 p.s.i. and an axial hole therethrough. A die wear ring of greater elastic modulus and greater hardness is shrunk fit into the axial hole. Tungsten carbide is a suitable material for each part.

Abstract: A container for drawing or ironing dies is particularly useful but is not limited to can making. It includes an outer ring having an inwardly extending flange at one end and a disc secured to its other end so as to provide a peripheral space for receiving at least three segments which are resiliently urged against a die ring. The radial length of the slot is greater than the radial length of the segments so that the die ring can be displaced from the normal axis of the die pack. Means co-axial with the normal axis of the die limit inward movement of the segments.

Abstract: A reusable draw or ironing die includes a tool steel body having an axial hole therethrough. A first carbide insert is shrunk fit into the axial hole and a second carbide insert is press fit within the first carbide insert.

Abstract: A container for drawing or ironing dies is particularly useful but is not limited to can making. It includes an outer ring having an inwardly extending flange at one end and a disc secured to its other end so as to provide a peripheral space for receiving at least three segments which are resiliently urged against a die ring. The radial length of the slot is greater than the radial length of the segments so that the die ring can be displaced from the normal axis of the die pack. Means co-axial with the normal axis of the die limit inward movement of the segments.

Abstract: An assembly for drilling a hole in a roof to a greater depth than the height of the chamber therebelow includes a starter-driver bar having a first end adapted to be driven by a motor and a second end having a female socket therein, a rod extension including a male end shaped to be received in said female socket and a female socket at its other end of the same cross-sectional size and shape as the first named female socket, and a bit having a male shank of the same general cross-sectional shape as said male end. The male shank which is received in the socket has a pair of opposed longitudinal grooves in its outer surface extending from its lower end to a point beyond the socket. The starter-driver bar and rod extensions have axial holes therethrough so that a suction or water can be provided at the lower end of the assembly. When a suction is to be applied the sockets have at least one hole through its wall which is not covered by the drill shank, but which is covered by the male end of the rod extension.

Abstract: An assembly for drilling a hole in a roof to a greater depth than the height of the chamber therebelow includes a starter-driver bar having a first end adapted to be driven by a motor and a second end having a female socket therein, a rod extension including a male end shaped to be received in said female socket and a female socket at its other end of the same cross-sectional size and shape as the first named female socket, and a bit having a male shank of the same cross-sectional shape as said male end. A starter hole is first drilled using the starter-driver with the drill bit in its top and a motor connected to its lower end. Drilling then is continued with an assembly consisting of a first rod extension between the bit and starter-driver. Additional rod extensions are inserted between the starter-driver and the bottom rod extension until a hole of the desired depth is obtained.

Abstract: An assembly for drilling a hole in a roof to a greater depth than the height of the chamber therebelow includes a starter-driver bar having a first end adapted to be driven by a motor and a second end having a female socket therein, a rod extension including a male end shaped to be received in said female socket and a female socket at its other end of the same cross-sectional size and shape as the first named female socket, and a bit having a male shank of the same cross-sectional shape as said male end. A starter hole is first drilled using the starter-driver with the drill bit in its top and a motor connected to its lower end. Drilling then is continued with an assembly consisting of a first rod extension between the bit and starter-driver. Additional rod extensions are inserted between the starter-driver and the bottom rod extension until a hole of the desired depth is obtained.

Abstract: Apparatus for underground drilling includes a housing having a bottomed opening in its top and a hole extending downwardly through the housing from the opening. A rotatable chuck is received in the opening and has a vertical bore therethrough with non-circular upper portion for receiving a hollow drill rod, an intermediate portion and an enlarged lower portion having a shoulder at the top thereof. A compressible plug is closely received in the vertical bore and has an enlarged bottom portion with its top bearing against the shoulder and its bottom bearing against the bottom of the chuck bore. The plug has a frusto-conical upper portion which is compressed by the bottom of the hollow drill rod. A hollow adapter is received in the hole in the housing in spaced relationship with the chuck and has sealing engagement with the hole wall.