Patent ID: 7156010

Claim:
A disk cutter comprising: an annular disk-shaped base adapted to be driven about an axis of rotation; a plurality of tip supports formed along the outer circumference of said base integrally therewith so that a gullet is defined between adjacent ones of said tip supports; a plurality of tip inserts respectively fixed to said tip supports; a plurality of outer slits formed at an outer circumferential portion of said base so as to be arranged at given intervals, each of said outer slits having an outer end opening to said gullet; and a plurality of intermediate slit pairs formed at a radially intermediate portion of said base so as to be arranged at said given intervals in such a manner that each of said intermediate slit pairs is located between adjacent ones of said outer slits; each of said intermediate slit pairs having a substantially J-shaped first slit and a substantially inverted J-shaped second slit arranged in point symmetrical relationship with said first slit; said first and second slits having straight portions parallel to each other, the spacing W between said straight portions of said first and second slits and the thickness t of said base being set so as to satisfy the relation of 0.4≦W/t≦1.1; each of said first and second slits being filled with a viscous material having viscosity at ordinary temperature.