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