Counter rotating double disc chunker

A device for cutting wood materials such as roundwood, treetops, branches and waste wood into pieces of such wood materials of predetermined substantially uniform lengths of such materials suitable for combustion comprising

• a pair of opposed disc members;
• means to mount said disc members to that their circular faces are in facing relation to each other;
• means to feed the wood materials to be cut into the space between said pair of facing opposed disc members;
• means to rotate said disc members in opposite directions;
• knife means mounted on each of said disc members on the respective facing circular faces thereof;
• each of said knife means comprising a first cutting edge and a second cutting edge, said second cutting edge being located in a plane parallel to the plane of rotation of its respective member, said first cutting edge extending in the direction of rotation of its respective disc member from the end of said second cutting edge which leads in the direction of rotation of its respective disc member at a slant to said circular face of said respective disc member, the planes containing the second cutting edges of said knife means on said pair of disc members being located in the space between said facing circular faces of said disc members;
• and means to locate said disc members with respect to each other such that said second cutting edges pass each other in the same predetermined closely spaced relation during each rotation of said disc members in said opposite directions;
• said knife means alone performing all of the cutting of said wood materials;
• and
• said oppositely rotating knife means tending to rotate said wood materials about a line of wood material feed defined by said feed means;
• whereby wood materials fed longitudinally between said knife means are cut by said knife means into said lengths rather than being chipped or crushed or otherwise finely divided, and whereby cutting of said wood materials proceeds continuously.