US 4,162,769 AGranted

Whole tree chipper

AssigneeDomtar Inc.

InventorJoseph A. Lapointe

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Abstract

A whole tree chipper composed of a housing encasing a rotor formed by a pair of substantially identical axially aligned frustro-conical hollow discs having their minimum diameter ends connected together and provided with at least one knife on each disc is disclosed. A slot extends through each disc adjacent each knife, for directing chips cut by the knife through the disc into a chip chamber located at the adjacent axial end of the housing. The rotor is rotated about the said axially aligned axes of the pair of discs and wood in the form of whole tree sections, is advanced longitudinally through an inlet spout which extends through the peripheral wall of the housing toward the conical faces of the discs forming the rotor. A debris chamber extends circumferentially of the rotor in said housing between the inlet spout and a debris outlet. Preferably a deflector is provided in the debris chamber to deflect debris toward the larger diameter ends of the discs into a position to be engaged by a set of paddles mounted on the larger diameter ends of each disc in a position to pass through the debris chamber and eject debris through the debris outlet. A chip outlet is provided from each of the chip chambers in the housing for ejecting chips from the chipper. The chipper thus ejects cut chips separately from debris which includes twigs and branches etc.

Claims12

Dependent claims

A whole tree chipper comprising a housing having a rotor therein, said housing including a circumferential wall and chip chambers formed at each axial end thereof;

said rotor being formed by a pair of substantially identical axially aligned frustro-conical hollow discs connected together at their minimum diameter axial ends and rotatable about their common axis, at least one knife projecting from the conical outer face of each disc;
a slot through said conical outer face adjacent said knife for directing chips cut by said knife to the interior of said hollow disc and into said chip chamber at the adjacent axial end of said rotor;
means to rotate said rotor;
an inlet through said circumferential wall for feeding tree lengths with twigs and branches thereon substantially longitudinally through said inlet and against said conical faces of said rotor;
a debris outlet through said circumferential wall;
a debris chamber in said housing between said circumferential wall and said conical faces of said discs, means separating said debris chamber from said chip chambers, said debris chamber extending between said inlet and said debris outlet, said debris outlet connected with said debris chamber, means on said rotor for ejecting debris from said debris chamber through said debris outlet, and a chip outlet from each of said chip chambers for ejecting the chips from said said chip chamber whereby chips are ejected from said chipper separate from debris, said debris including at least some of said twigs and branches.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/874,795Filed 3 Feb 1978 · continuation in part
Priority: 15 Apr 1976
Granted: 31 Jul 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

B27L 11/02
Manufacture of wood shavings, chips, powder, or the like ; Tools therefor: of wood shavings or the like
A01G 3/002
Cutting implements specially adapted for horticultural purposes; Delimbing standing trees: for comminuting plant waste
B02C 18/14
With rotating knives: within horizontal containers
B02C 18/143
Within horizontal containers: with a disc rotor having generally radially extending slots or openings bordered with cutting knives