Abstract: A wood chipping apparatus includes a housing having a chipping chamber and an air chamber isolated by a fixed partition wall of the housing. A chipping drum is supported for rotation in the chipping chamber. A fan is supported for rotation in the fan chamber. The chambers have adjacent outlets that communicate with a discharge chute. Wood chips exiting the chipping chamber are received in the chute and are entrained by air issuing from the fan chamber to carry the chips along the chute. A baffle separates the outlets of the chambers and ensures that the air from the fan chamber does not backflow into the chipping chamber through its material outlet.

Abstract: A tractor driven stump grinder for a wheeled tractor frame having a drive motor operating the wheels to move the tractor forwardly and rearwardly, the tractor having a support member movable vertically on the tractor frame and rotatably carrying a generally vertically disposed broadsidely oriented grinder disc. A series of circumferentially spaced generally radial stump grinding tools project peripherally from each vertical face of the grinder disc, and a drive mechanism is provided for rotating the grinder disc in a plane transverse to the longitudinal tractor frame as it cuts a horizontal swath and then a subjacent swath in a pass across the upper end of a stump in both forward and rearward directions of movement of the tractor.