Patent ID: 8317117

Claim:
A chipper comprising: a feed chute, a discharge chute, and a cutter drum positioned between the feed chute and discharge chute, wherein the cutter drum rotates about an axis of rotation defined by a drive shaft of the cutter drum and includes a generally cylindrical cutting surface, opposed end surfaces recessed relative to edges of the cutting surface, a plurality of chip pockets recessed in the cylindrical cutting surface and positioned to overhang past the recessed end surfaces, and a plurality of air flow deflectors connected to the end surfaces; and wherein the chip pockets include: open outer sides that face radially outwardly from the axis of rotation of the cutter drum; bottom walls positioned opposite from the open outer side of the chip pockets, the chipper being configured such that the air flow from the air flow deflectors does not pass through the bottom walls; and side walls arranged such that the chip pockets are substantially closed except for the outer sides.