Device for attaching blades to rings connected to a rotating shaft for an agricultural machine
A device for attaching blades to rings which are integrally connected to a rotating shaft for an agricultural machine. Each ring has several cutouts which can receive, by nesting support feet of flat segments, each segment bearing one or several blades, for mounting the segments to the ring adjacent to each other in a circumferential direction and for configuring the segments into a blade support disc.
1. A device for fastening blades to rings, the rings being transversely attached to a rotating shaft, in which the blades extending radially outward from the rings, each ring having at least one cutout in a side face of the ring, beginning at a periphery of the ring, and shaped to receive and to retain radially at least one complementary flat part of a blade support foot such that a side surface of the support foot is flush with a corresponding outer surface of the side face of the ring, the rings being mounted in a line on the rotating shaft and tightened axially and jointly against each other by axial tightening means in which successive opposite ring side faces, each having a cutout, bear against a side face having a cutout and against the blade support feet, locking the support feet completely inside respective cutouts, wherein each ring includes a plurality of cutouts which can receive, by nesting, support feet for flat blade segments, each blade segment bears at least one blade, and the blade segments of the ring are adjacent to one another in a circumferential direction, arranged in a support disc for the blade.
2. The device in accordance with claim 1 , wherein each blade segment comprises at least two opposing radially internal support feet, each internal support foot fitting into a mating part of a cutout in a corresponding ring, and adjacent feet of the two blade segments fit side-by-side in the same mating cutout.
3. The device according to claim 2 , wherein each blade segment has at least a third radially internal support foot located between the two opposed support feet and fitting into a mating cutout in the corresponding ring, located between the other two cutouts in the ring.
4. The device according to claim 3 , wherein the third foot of the blade segment has an approximate shape of an inverted T.
5. The device according to claim 3 , wherein the three blade segments can be attached to the corresponding ring.
6. The device according to claim 2 , wherein each of the opposing feet of a blade segment has an internal boss or recess which extends in a circumferential direction from the blade segment and fits into a mating boss or recess in one side of the corresponding cutout and which extends in a circumferential direction of the ring.
7. The device according to claim 2 , wherein one of outer sides of an opposed support foot of a blade segment has an inward obtuse angle in which may be fitted an outer side which has an outward obtuse angle of an opposed support foot of an adjacent blade segment when both feet are engaged in a common cutout of the ring.
8. The device according to claim 1 , wherein at an embedded position of each blade segment in the side face of the corresponding ring, an internal arched edge of the segment bears against a corresponding part of an external circular periphery of the ring.
9. The device according to claim 1 , wherein each blade segment has at least two external blades.
10. The device according to claim 1 , wherein the blades have a sawtooth configuration.