Abstract: A drill bit consisting of a tubular, main body member having a set of threads at one end thereof connectable to a drill stem and an annular mounting edge on an opposite end thereof, the mounting edge having a plurality of circumferentially spaced, longitudinally disposed recesses, the main body member having an enlarged annular portion adjacent the annular mounting edge, the enlarged portion of the main body member having a plurality of circumferentially spaced recesses disposed at an angle relative to the axis of the main body member, each of the recesses in the enlarged portion of the main body member being disposed between a set of recesses in the annular mounting edge and providing a pair of converging surfaces, a plurality of blades, each of the blades being disposed in a recess in the mounting edge, substantially radially relative to the axis of the main body member, having a recess receiving a wall portion of the main body member and a surface aligned with a surface of an adjacent set of the sets of co
Abstract: A rotary abrasive drilling bit disclosed herein is of a construction wherein teeth are equipped on the fore part of a bit body attached to a rotary drill pipe, each of said teeth is composed of a plurality of chips which are made of cemented tungstencarbide and the matrix thereof which is soft and inferior in abrasion resistance relative to said cutting elements or chips, each chip is shaped like a thin stick and extends along the cutting direction of said bit body, the matrix surrounds said chips, and in the matrix of each tooth the chips are orderly arranged to leave a desired interspace along the direction of radius as well as the direction of circumference of the bit body.
Abstract: A rotary rock bit is formed from at least two individual segments. The individual segments are positioned together and aligned in the proper position for the final assembled bit. The seams between the individual segments are in the form of square-butt type joints and the adjoining segments have surface areas that are in abutting relationship to each other. A beam of energy such as an electron beam or a laser beam is directed into the seams. Relative movement between the beam and segments of the bit causes the beam to traverse the seams and join said individual segments together throughout substantially all of said abutting surface areas.
Abstract: A rotary percussion bit comprises a body having at its upper end a threaded pin adapted to mate with a length of dual conduit drill stem. A plurality of down flow passages for air or other drilling fluid are near the periphery of the body. Inwardly of the down flow passages is an upflow passage. Channels across the lower face of the body connect the down flow and upflow passages. Over the bottom face of the body are located interior boring elements. The face is preferably concave, comprising a plurality of annular steps. At the lower end of the body is disposed a ring on the flat bottom of which are located gage and near gage boring elements. The ring extends down below the outer periphery of the bottom face of the body of the bit. The ring is secured to the body by quick attachable and detachable means in the form of an epoxy cemented straight threaded rotary shouldered connection, the ring having a bevelled lip extending upwardly around the bit body.