Chipping apparatus

Claim 2

Apparatus for chipping wood which comprises base structure including a housing, a rotor mounted for rotation in said housing on an axis, and guide means establishing a predetermined path of feeding movement of wood to said rotor, and which is characterized by: a. said rotor having a working face composed of multiple arcuately curved land segments arranged symmetrically about said axis in stepped relation defining a profile composed of substantially right angled steps, b. said rotor having openings therethrough in symmetrically alternating relation with said land segments, c. knife means associated with each said opening and secured to said rotor with the cutting end thereof projecting through said associated opening adjacent the trailing edge of said opening, d. said knife means including a cutting edge arranged effectively parallel with each said land segment and another cutting edge arranged effectively parallel with the surface connecting said land segment with an adjacent land segment, and e. each of said land segments having a generally spiral configuration in the direction of said wood feeding path providing minimum spacing in said direction between the leading end of said segment and the adjacent said knife edge and maximum spacing in said direction between the trailing end of said segment and the following said opening and knife edge.

Claim 3

Chipping apparatus as defined in claim 1 wherein said knife means comprises multiple knives each having a pair of angularly related cutting edges, and means forming an ajustable mounting for each said knife on said rotor to provide for adjustment of said edges thereof to positions of predetermined projection outwardly of the associated said opening.

Claim 4

Chipping apparatus as defined in claim 1 wherein said guide means comprises an anvil having a stepped periphery substantially complementary to said rotor face profile, and means supporting said anvil with said periphery matching said rotor profile and in predetermined spaced relation therewith providing minimum clearance between the leading end of each said land segment and the end of the corresponding step portion of said anvil for passage of said knife edge parallel with said land segment, maximum clearance between the trailing end of said segment and said step portion of said anvil, and working clearance between the side edge of said step portion and the adjacent other said knife edge.

Claim 5

Chipping apparatus as defined in claim 3 wherein said knife means comprises multiple knives each having a pair of angularly related cutting edges, and means forming an adjustable mounting for each said knife on said rotor to provide for adjustment of said edges thereof arranged to execute a cutting stroke substantially parallel to and in closely spaced relation with the corresponding step portions of said anvil.

Claim 6

Apparatus for chipping wood which comprises base structure including a housing, a rotor mounted for rotation in said housing, and guide means in said housing for establishing a predetermined path for feeding movement of wood to said rotor, and which is characterized by: a. said rotor having a double frustoconical outline with its portion of minimum radius intermediate the ends thereof, b. said rotor having a working face composed of multiple arcuately curved lands defining cylindrical segments parallel with said axis and of different radii providing a profile composed of substantially right angled steps, c. each of said lands being composed of a plurality of segments alternating with an opening extending through said face to the adjacent end of said rotor, d. knife means associated with each said opening and secured to said rotor with the cutting end thereof projecting through said predetermined opening adjacent the trailing edge of said opening, e. said knife means including a cutting edge arranged effectively parallel with each land and a cutting edge arranged effectively parallel with the surface connecting each said land and an adjacent land, and f. each of said land segments having a spiral configuration radially of said rotor axis providing the maximum dimension of said segment radially of said axis at the leading end thereof and the minimum dimension of said segment radially of said axis at the trailing edge thereof.

Claim 7

Apparatus for chipping wood which comprises base structure including a housing, a rotor mounted for rotation in said housing, and guide means in said housing for establishing a predetermined path for feeding movement of wood to said rotor, and which is characterized by: a. said rotor having a double frustoconical outline with its portion of minimum radius intermediate the ends thereof, b. said rotor having a working face composed of multiple arcuately curved lands defining cylindrical segments parallel with said axis and of different radii providing a profile composed of substantially right angled steps, c. each of said lands being composed of a plurality of segments alternating with an opening extending through said face to the adjacent end of said rotor, d. knife means associated with each said opening and secured to said rotor with the cutting end thereof projecting through said predetermined opening adjacent the trailing edge of said opening, e. said knife means including a cutting edge arranged effectively parallel with each land and a cutting edge arranged effectively parallel with the surface connecting each said land and an adjacent land, and f. each of said land segments having a spiral configuration radially of said rotor axis providing the maximum dimension of said segment radially of said axis at the leading end thereof and the minimum dimension of said segment radially of said axis at the trailing edge thereof.

Claim 8

Chipping apparatus as defined in claim 5 wherein said knife means comprises multiple knives each having a pair of angularly related cutting edges, and means securing each said knife to said rotor with one of said edges thereof extending substantially parallel with said rotor axis and the other of said edges lying in a plane substantially normal to said axis.

Claim 9

Chipping apparatus as defined in claim 5 wherein said path is substantially normal to a plane through the rotational axis of said rotor, and said guide means comprises an anvil having a stepped periphery substantially complementary to said rotor face profile, and means supporting said anvil with said periphery matching said rotor profile and in predetermined spaced relation therewith providing minimum clearance between the leading end of each said land segment and the end of the corresponding step portion of said anvil for passage of said knife edge parallel with said land segment, maximum clearance between the trailing end of said segment and said step portion of said anvil, and working clearance between the side edge of said step portion and the adjacent other said knife edge.

Claim 10

Chipping apparatus as defined in claim 7 wherein said knife means comprise multiple knives each having a pair of angularly related cutting edges, and means securing each said knife to said rotor with each of said edges thereof arranged to execute a cutting stroke substantially parallel to and in closely spaced relation with the edges of corresponding step portions of said anvil.