Cutter head with cutting members that rotate relative to each other

  • US 6,003,953 A
  • Filed: 05/04/1998
  • Issued: 12/21/1999
  • Est. Priority Date: 10/15/1997
  • Status: Expired due to Fees
First Claim
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1. A cutter head comprising:

  • a fixed casing defining an axis of rotation;

    a plurality of transmission shafts including a central transmission shaft and at least two tubular transmission shafts, each shaft having a first end fixedly connected with a cutting member and a second end;

    means for rotatably mounting said plurality of transmission shafts at the second ends thereof to said casing and to one another coaxially about said axis of rotation with one shaft being disposed over an outer periphery of another shaft;

    means for driving said plurality of transmission shafts in such a manner that the shafts are driven independently with one another and any two radially adjacent shafts are driven to rotate in a first direction and a second direction which is opposite to said first direction with respect to said axis of rotation, respectively; and

    such that the central transmission shaft includes a screw rod portion, the cutting member of the central transmission shaft is a tubular member having a closed end connected to the transmission shaft and an open end, and wherein a number of openings and at least one helical cutting blade are provided on a peripheral wall of the tubular cutting members of the at least two tubular transmission shafts, cutters being provided on an end face of the open end of the tubular member and on said at least one helical cutting blade.

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