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OwnerPetrus Tarasius Josephus Spieringinventor
Estimating the term…
A mill comprises a housing (3) and a drum (15), provided with cutting members (17), which is rotatably located inside the housing. The cutting members and the drum are made from one piece and the cutting members are formed by local thickenings of the wall of the drum. The cutting members have a cutting edge from which one point (41) protrudes in the circumferential direction of the drum, such that during operation the cutting members contact the material to be milled with this point first. The cutting members are located on the intersection of an imaginary spiraled line (47) around the drum and a number of imaginary oblique lines (49), which run at an angle with the axial direction of the drum. The cutting members are formed by machining the outer surface of a thick-walled drum, such that on the outer surface of that drum a spiral-shaped rim remains, which is removed at a number of places. Cutting edges with clearance surfaces are machined at the remaining parts of the rim.
In a mill comprising a housing, having at least one opening for supply of material to be milled and for removal of machined chips, and a hollow drum, having a substantially cylindrical wall provided with a plurality of cutting members and openings therein adjacent at least some of the cutting members so that milled material can pass through the drum to its interior, which drum is rotatably located inside the housing, the improvement wherein the cutting members and the drum are made from one piece, and wherein at least some of the cutting members are disposed at a plurality of locations which are mutually displaced in the axial direction of the drum, and are formed by local thickenings of the wall of the drum.
In a hollow, substantially cylindrical drum, suitable for use in a mill, said drum having a plurality of cutting members and openings therein adjacent at least some of the cutting members so that milled material can pass through the drum to its interior, the improvement wherein at least some of the cutting members are mutually displaced in the axial direction of the drum, and wherein the cutting members and the drum are made from one piece and the cutting members are formed by local thickenings of the wall of the drum.
Dependencies are inferred from the claim text.