Abstract: A cutting implement comprises a substrate having a cutting edge, and plurality of hardfacing beads deposited on the substrate transverse to the edge of said substrate.

Abstract: A cutting implement comprises a substrate having a cutting edge, and plurality of hardfacing beads deposited on the substrate transverse to the edge of said substrate.

Abstract: A shearbar comprises an elongated mild steel body 10 having a top surface 14 covered with a layer of hardfacing material 16 along at least one longitudinal edge 18 to act as a counter knife to a rotary cutter. To resist the development of a wear gully on the vertical side of the body 10 below the cutting edge of the hardfacing material 16 the body has a region 22, having a hardness intermediate that of the steel body and the hardfacing layer, extending along and immediately below the longitudinal edge 18 of the hardfacing layer. In one embodiment the region is an inlay of tool steel. In another embodiment the region is formed by heat-hardening the corners of the body 10 itself.

Abstract: A shearbar comprises an elongated mild steel body 10 having a top surface 14 covered with a layer of hardfacing material 16 along at least one longitudinal edge 18 to act as a counter knife to a rotary cutter. To resist the development of a wear gully on the vertical side of the body 10 below the cutting edge of the hardfacing material 16 the body has a region 22, having a hardness intermediate that of the steel body and the hardfacing layer, extending along and immediately below the longitudinal edge 18 of the hardfacing layer. In one embodiment the region is an inlay of tool steel. In another embodiment the region is formed by heat-hardening the corners of the body 10 itself.

Abstract: An improved air gun for firing paint balls, pellets,, consisting of a passively venting and freeze resistant regulator, a pressure differential trigger mechanism, and a muzzle break with angled sidewalls. The freeze resistant regulator regulates incoming high pressure gas to a user predetermined pressure to operate the gun while avoiding freezing of the regulator associated with frigid incoming compressed gases and high firing rates. This is accomplished by using a heat transmission component formed by the engagement between a hemispheric shaped tip of a regulating pin and a hemispheric cavity of an adjustment piston. Passive venting of gas from the gun upon removal of the pressurized gas supply is provided by the regulator using a reciprocating regulating pin and adjustment piston which combine to compress a seal into a seat only when pressurized gas is attached to the air gun. Once detached from a pressurized air supply the compressed air in the gun vents through the seat.

Abstract: A shank adapter for a rock drill, which is used to connect one end of a drill string to a rock drill, has a chuck end (10) made from one piece of material and an opposite, threaded end (16) made from another, different, material. The chuck end and the threaded end are permanently joined to one another in one stage of manufacturing.