Support disc for expendable polishing pad

Abstract

A support disc ( 3 ) is described for expendable pad ( 4 ) for polishing machine ( 1 ), having a raised peripheral edge ( 12 ). Said disc ( 3 ) also provides with a self-centring lower central neck ( 7 ) suitable for being coupled with a central hole ( 8 ) of the pad ( 4 ).

1 . A support disc ( 3 ) for expendable pad ( 4 ) for polishing machine ( 1 ), comprising a raised peripheral edge ( 12 ). 
   
   
       2 . The support disc ( 3 ) according to the  claim 1 , further comprising a self-centring lower central neck ( 7 ) suitable for being coupled with a central hole ( 8 ) of the pad ( 4 ). 
   
   
       3 . The support disc ( 3 ) according to the  claim 1 , wherein the edge ( 12 ) is angled at between 10° and 15° with respect to the flat portion ( 30 ) of the disc ( 3 ) for a pad with hardness between 22 and 26 Sh. 
   
   
       4 . The support disc ( 3 ) according to the  claim 1 , wherein the edge ( 12 ) is angled at between 15° and 30° with respect to the flat portion ( 30 ) of the disc ( 3 ) for a pad with hardness between 18 and 22 Sh. 
   
   
       5 . The support disc ( 3 ) according to the  claim 1 , characterised in that wherein the edge ( 12 ) is angled at between 30° and 50° with respect to the flat portion ( 30 ) of the disc ( 3 ) for a pad with hardness between 12 and 18 Sh. 
   
   
       6 . The support disc ( 3 ) according to  claim 1  wherein the edge ( 12 ) is angled at between 45° and 60° with respect to the flat portion ( 30 ) of the disc ( 3 ) for polishing machine ( 1 ) for working faceways.