Waste material shredder
OwnerTakefumi Hatanakainventor
Life of this patent
Estimating the term…
Abstract
A waste material shredder having a pair of counter-rotating cutter rollers with mutually meshing cutter disks mounted thereon, and fixed spacer members separating the cutter disks. Sheets of waste material are shredded into small chips by the action of sharp protruding teeth on the cutter disks which punch transverse slits and by subsequent shearing action between adjacent opposing cutter disks. Jamming of the shredder due to build-up of chips between the spacers is eliminated by a special configuration of the cutter disks, with chip clearance protrusions being formed between the teeth which act to completely remove the cut chips from the shredder, thereby overcoming a basic problem with prior art "cross-cut" type shredders.
Claims9
A cutter disk for use in waste material shredding apparatus comprising a cutter disk having an outer peripheral surface which is concentric with its axis of rotation, said cutter disk having a plurality of pairs of protrusions protruding from said peripheral surface, each of said pair comprising a cutter tooth and a chip clearance protrusion leading the cutter tooth of that pair with respect to the direction of rotation of said cutter disk, each of said cutter teeth having an outermost tip portion formed with a sharp cutting edge, each of said chip clearance protrusions having an outermost blunt surface which is substantially perpendicular to a radial line which extends from said blunt surface to said axis of rotation, said outermost tip portion defining the outermost radial boundary of said cutter teeth and said outermost blunt surface defining the outermost radial boundary of said chip clearance protrusions, the radial distance between said outermost radial boundary of said cutter teeth and the axis of rotation of the cutter disk being substantially equal to the radial distance between said outermost radial boundary of said blunt surface of said chip clearance protrusion and the axis of rotation of the cutter disk.
A cutter disk for use in waste material shredding apparatus comprising a cutter disk having an outer peripheral surface which is concentric with its axis of rotation, said cutter disk having a plurality of pairs of protrusions with each pair being formed at a regular spacing around said outer peripheral surface, each of said pair comprising a cutter tooth and a chip clearance protrusion leading the cutter tooth of that pair with respect to the direction of rotation of said cutter disk, each of said cutter teeth and each of said chip clearance protrusions protruding radially outward from said peripheral surface, each of said cutter teeth having a tip portion formed with a sharp cutting edge, each of said chip clearance protrusions having a blunt surface which is substantially perpendicular to a radial line which extends from said blunt surface to said axis of rotation, said cutting edge defining the outermost radial boundary of said cutter teeth and said blunt surface defining the outermost radial boundary of said chip clearance protrusions, the radial distance between said outermost radial boundary of said cutter teeth and the axis of rotation of the cutter disk being substantially equal to the radial distance between said outermost radial boundary of said blunt surface of said chip clearance protrusion and the axis of rotation of the cutter disk.
Dependencies are inferred from the claim text.