Patent ID: 8051887

Claim:
Apparatus for producing wood chips that includes: a rotatable disc having a series of spaced apart radially extended slots passing between a front face and a rear face of said disc; a primary chipper knife mounted along a radial wall of each slot at the entrance to said each slot for slicing chips from a wooden work piece that is placed in contact with the front face of said disc and directing said chips into said each of said slots; a counter knife unit mounted within each of said slots behind said primary chipper knife; said counter knife unit further including a first series of chip contact elements each having a first height for initially engaging chips leaving said primary chipper knife to reduce the size of said chips; said counter knife unit further including a second series of chip contact elements each having a second height that is less than the height of said first chip contact elements and being arranged to engage said chips leaving said first series of contact elements to further reduce the size of said chips.