Patents Assigned to Kroll-Disab AB
  • Patent number: 5803195
    Abstract: In a method for use in dry, rotary, crushing full-area drilling, use is made of suction air alone for removing cuttings produced during drillings. To carry out the method, two suction nozzles (13) are arranged on the underside of a cutterhead (1). These nozzles together have a substantially diametrical extent and the length of a radius on the cutterhead and are provided with suction intakes (14A) in the vicinity of the periphery of the cutterhead. The suction intakes (14A) are connectible a common suction channel (11) in the drill string (6) of the cutterhead. The suction channel (11) has substantially constant diameter.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: September 8, 1998
    Assignees: Kroll-Disab AB, Sandvik AB
    Inventors: Karl Thorbjorn Haugen, Gert Axel Lovgren, Stig-.ANG.ke Brolund, Roland Kallvik