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US 2010/0163662 A1Published application
Chipper Knife and Method of Manufacturing a Chipper Knife
AssigneeIggesund Tools AB
InventorsTorbjörn Andersson, Torbjörn Bäcklund
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AssigneeIggesund Tools AB
InventorsTorbjörn Andersson, Torbjörn Bäcklund
Estimating the term…
The invention relates to a chipper knife of the type that is adapted to be mounted in chippers which have a rotatable tool, in the form of a disc, drum or frustoconical member, on which are mounted a plurality of such chipper knives to provide, during rotation of the tool and simultaneous feeding of pieces of wood to the same, material-cutting working or disintegrating of the pieces of wood into chips by means of at least one cutting edge (1, 1′). At least a first side of the chipper knife has a raw, unworked surface or working stripes in the longitudinal direction of the chipper knife, that is substantially parallel to the cutting edge. This first side also has a thickened cutting edge portion (5, 5′) in the area next to the cutting edge, which edge portion has working stripes in the transverse direction of the chipper knife, at an angle to the cutting edge. The invention also relates to a method of manufacturing such a chipper knife.
A chipper knife of the type that is adapted to be mounted in chippers which have a rotatable tool (10), in the form of a disc, drum or frustoconical member, on which are mounted a plurality of such chipper knives to provide, during rotation of the tool and simultaneous feeding of pieces of wood or timber to the same, material-cutting working or disintegrating of the pieces of wood into chips, comprising at least one cutting edge (1, 1′) which is defined between two edge-forming surfaces at an acute angle to each other, at least a first side of the chipper knife having a raw, unworked surface or working stripes in the longitudinal direction of the chipper knife, that is substantially parallel to the cutting edge, characterised in that the first side is formed with a thickened edge portion (5, 5′) in the area next to the cutting edge, which edge portion has working stripes in the transverse direction of the chipper knife, that is at an angle to the cutting edge.
A chipper knife as claimed in any one of the preceding claims, characterised in that the thickened cutting edge portion (5, 5′) is 3-7 mm wide, preferably 4-6 mm wide.
A chipper knife as claimed in any one of the preceding claims, characterised in that the thickened cutting edge portion (5, 5′) is 0.05-0.5 mm thick.
A chipper knife as claimed in any one of the preceding claims, characterised in that the angle between the working stripes in the thickened cutting edge portion (5, 5′) and the cutting edge (1, 1′) amounts to at least 45°.
A chipper knife as claimed in any one of the preceding claims, characterised in that the angle between the working stripes in the thickened cutting edge portion (5, 5′) and the cutting edge (1, 1′) amounts to at least 70°.
A method of manufacturing a chipper knife of the type that is adapted to be mounted in chippers which have a rotatable tool (10), in the form of a disc, drum or frustoconical member, on which are mounted a plurality of such chipper knives to provide, during rotation of the tool and simultaneous feeding of pieces of wood to the same, material cutting working or disintegrating of the pieces of wood, the chipper knife comprising at least one cutting edge (1, 1′) which is defined between two edge forming surfaces at an acute angle to each other, comprising the steps of making a blank for a chipper knife in such a manner that it obtains a thickened cutting edge portion (5, 5′) on at least one side in the area next to the cutting edge, and working the thickened cutting edge portion so that it obtains working stripes at an angle to the cutting edge.
Dependencies are inferred from the claim text.