Leading Portion Is Forked Rotary Type Patents (Class 175/392)
  • Patent number: 7513319
    Abstract: A drill steel includes a drill bit and a reamer bit. The drill steel rotates the drill bit to form a hole in a work surface and drives forward to insert the reamer bit into the hole. The reamer bit includes a plurality of inserts positioned on a cylindrical drilling surface to ream out the hole by carving channels in the hole interior surface. The inserts include cutting elements that have radiused or arcuate edges.
    Type: Grant
    Filed: June 11, 2007
    Date of Patent: April 7, 2009
    Inventor: Donald L. DeVall
  • Patent number: 6502649
    Abstract: An auger for drilling fishing holes in ice on a body of water has an elongated shank supporting a continuous helical flight and a plurality of partially helical scoop-like members having leading generally radial edges, ice cutting blades releasably fastened to the members adjacent their leading edges having outer portions that extend radially outward from outer edges of the members supporting the blades and serrated forward cutting edges, and a positioning pin secured to the lowermost end of the shank for drilling a positioning hole in the ice.
    Type: Grant
    Filed: October 15, 2001
    Date of Patent: January 7, 2003
    Assignee: Strikemaster Corporation
    Inventor: Randall L. Havel
  • Patent number: 6202768
    Abstract: A rock drilling tool includes a pilot bit screw threaded into a front end of a drill rod. A reamer is mounted on the outside of the pilot bit. The reamer includes a central opening having a front portion and a rear portion. The front portion is connected to the pilot bit, and the rear portion constitutes a stiffening sleeve which extends around the outside of the drill rod.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: March 20, 2001
    Assignee: Sandvik AB
    Inventors: Daniel Lindgren, Per-Olof Liljebrand, Håkan Lindström
  • Patent number: 4550791
    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.
    Type: Grant
    Filed: April 3, 1985
    Date of Patent: November 5, 1985
    Assignee: Kennametal Inc.
    Inventor: Edmund Isakov
  • Patent number: 4074780
    Abstract: An earth auger having an integral or one piece cutting blade and pilot element so arranged that the pilot element is spaced downwardly from the shaft of the auger; the cutting blade also having a curved edge swept back from the axis of the auger to provide a slicing action as well as "threading" action to facilitate penetration of the auger into the ground.
    Type: Grant
    Filed: July 28, 1976
    Date of Patent: February 21, 1978
    Inventor: Robert E. Gilbert
  • Patent number: 3995706
    Abstract: A drill of the type comprising a pilot point for locating the drill in a medium to be drilled and cutting means extending from the pilot point and having a radially outermost portion which defines the radius of the hole to be drilled and which precedes a radially inner portion into the medium both axially and radially to promote fracture of the medium laterally of the direction of drilling and thereby to facilitate drill penetration into the medium.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: December 7, 1976
    Assignee: Western Rock Bit Company Limited
    Inventor: Kenneth M. White