Patents Assigned to Boring & Tunneling Company of America, Inc.
  • Apparatus for cutting hard earth formations
    Patent number: 4244625
    Abstract: The chain link conveyor assembly of an earth cutting machine is provided with means for mounting the conical cutting bits at a penetration angle on the range of 47.degree. to 53.degree. and a sideward angle in the range of 3.degree. to 12.degree.. Even bit wear is best promoted at penetration and sideward angles of 50.degree. and 71/2.degree., respectively.
    Type: Grant
    Filed: July 13, 1978
    Date of Patent: January 13, 1981
    Assignee: Boring & Tunneling Company of America, Inc.
    Inventors: Gilbert M. Turner, Clarence L. Stepp