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1. (WO2019043618) METHOD FOR FASTENING A ROTARY ABRASIVE TOOL TO A SPINDLE AND FASTENING DEVICE THEREOF
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CLAIMS

1. A rotary tool (1) having a base (10) to which an abrasive body (20) is rigidly coupled; the base (10) having an annular edge (12) projecting outwards in respect to said abrasive body (20); an adapter (30) being provided to connect said base (10) to a spindle (M) rotatable around a pivot axis (A) of a machine tool (MU) ; coupling means (40) suitable to connect said abrasive body (20) to said adapter (30) through said annular edge (12), characterized in that said coupling means (40) comprises an annular fastening member (42) shaped similarly to said annular edge (12) in order to couple to this latter in a conjugated manner; said annular member (42) being provided with a service hole (420) that can be axially engaged by said abrasive body (20) in order to keep said annular edge (12) in contact with said adapter (30) in a sandwich-like manner .

2. The tool according to claim 1, characterized in that said base (10) comprises a disc (10') and in that said annular member (42) comprises a flat ring (42') having an outer diameter that is substantially identical to an outer diameter of said disc (10').

3. The tool according to claim 2 , characterized in that said disc (10') is made of a plastic material; said annular edge (12) having a plurality of first through holes (120) distributed peripherally; said adapter (30) being made of metal; said ring (42') being made a metal material.

4. The tool according to claim 3, characterized in that said ring (42') has a plurality of second through holes

(420) substantially identical and distributed similarly to said first holes (120) ; said adapter (30) having a first outer edge (32) provided with a plurality of first protrusions (320) arranged to engage said first holes (120) and said second holes (420), so that said adapter (30) is suitable to transmit torque to said abrasive body (20) .

5. The tool according to claim 4, characterized in that said first and second holes (120) (420) are cylindrical and in that at least one of said first protrusions (320) comprises a first cylindrical member (3200) made of magnetic material the diameter of which approximates, by defect, a diameter of said first/second holes (120) (420) ; said ring (42') being made of ferromagnetic material so as to be axially held by each said cylindrical member (3200) .

6. The tool according to claim 3, characterized in that said adapter (30) has a plurality of third through holes (322) substantially identical and distributed similarly to said first holes (120); said ring (42') being provided with a plurality of second protrusions (422) arranged to engage said first holes (120) and said third holes (322) . 7. The tool according to claim 6, characterized in that said first holes (120) and said third holes (322) are cylindrical and in that at least one of said second protrusions (422) comprises a second cylindrical member (4220) made of magnetic material the diameter of which approximates, by defect, a diameter of said first/third holes (120) (322); said adapter (30) being made of ferromagnetic material.

8. The tool according to claim 4, characterized in that said first protrusions (320) are provided with a groove (321) dimensioned so as to be transversally engaged by said ring (42') by axial rotation, so that said ring (42') is able to act as axial abutment for said abrasive body (20) .

9. A method for fastening an abrasive body of a tool to a rotary spindle of a flat polishing machine; said tool comprising an adapter (30) made of ferromagnetic material to couple a disc (10') provided with an abrasive body (20) to the spindle of a sanding machine tool; said disc (10') being made of a plastic material and having an annular edge (12) projecting outwards in respect to said abrasive body (20) and provided with a plurality of fourth through holes (120); an annular member (42) being made of ferromagnetic material, peripherally shaped similarly to said annular edge (12) so as to couple to said annular edge (12) and provided with a plurality of fifth through holes (420) , substantially identical to said fourth holes (120); a plurality of third protrusions (320) made of magnetic material carried by said adapter (30) and shaped in a geometrically conjugated manner with said fourth (129) and fifth (420) holes; said method being characterized by comprising a first step of making said abrasive body (20) face said adapter (30) by bringing said corresponding annular edge (12) with the respective fourth holes (120) within the projection of said third protrusions (320); a second step of axially moving said abrasive body (20) so as to position said third protrusions (320) inside said fourth holes (120) until the corresponding said disc (10') axially abuts against said adapter (30) ; a step of making said annular member (42) with the respective fifth holes (420) face within the projection of said third protrusions (320); a step of positioning said third protrusions (320) inside said fifth holes (420) of said annular member (42) until this latter axially abuts against said annular edge (12) .

10. The method for fastening an abrasive body of a tool to a rotary spindle of a flat sanding machine; said tool comprising an adapter (30) to couple a disc (10'), provided with an abrasive body; to the spindle of a sanding machine tool; the adapter (30) being provided with a plurality of fifth through holes (322); said disc (10') being made of a plastic material and having an annular edge (12) projecting outwards in respect to said abrasive body (20) and is provided with a plurality of fourth through holes (120); said fifth holes (322) being substantially identical to said fourth holes (120); an annular member (42) peripherally shaped similarly to said annular edge (12) to couple to the same annular edge (12) ; a plurality of third axial protrusions (422) carried by said annular member (42) and shaped in a geometrically conjugated manner with said fourth holes (120) and fifth holes (322) ; said method being characterized by comprising a first step of making said abrasive body (20) face said adapter (30) by bringing the corresponding annular edge (12) with the respective said fourth holes (120) to face the respective said fifth holes (322); a second step of fitting said annular member (42) onto said abrasive body (20) with said third protrusions (422) inside said fifth holes (322) and fourth holes (120) until the corresponding said disc (10') axially abuts against said adapter (30) .