Polishing and/or sanding head for treating surfaces

Abstract

A polishing and/or sanding head ( 9 ) comprises: a primary disc ( 10 ) which is axially hollow; a rotating shaft ( 12 ) which is rotatably received in the internal cavity of the primary disc ( 10 ) and designed in such a way as to receive a rotary motion by means of a power take-off external to the head ( 9 ); and a body ( 14 ) which is radially external and coaxial with respect to the rotating shaft ( 12 ); the head ( 9 ) also comprises a planetary gear transmission which is adapted to transmit the rotational motion of the rotating shaft ( 12 ) to the body ( 14 ), and two treatment means ( 24, 26 ) which are integral in rotation with the rotating shaft ( 12 ) and the body ( 14 ), respectively, and have an exposed surface adapted to polish or sand a surface to be treated, which exposed surfaces are rotatable in different directions.

1 . A polishing and/or sanding head ( 9 ), comprising:
 a primary disc ( 10 ) which is axially hollow so as to form an internal cavity;   a rotating shaft ( 12 ) which is received in the internal cavity of the primary disc ( 10 ) and rotatably supported by the latter, said rotating shaft ( 12 ) being configured to be set into a rotary motion about an axis coincident to the axis of the primary disc ( 10 ) by means of a power take-off external to the polishing and/or sanding head ( 9 ); and   a body ( 14 ) which is radially external and coaxial with respect to the rotating shaft ( 12 ), said body ( 14 ) being rotatably supported by said primary disc ( 10 ), and wherein a planetary gear transmission which is adapted to transmit the rotary motion of the rotating shaft ( 12 ) to the body ( 14 ), said planetary gear transmission comprising:   a sun gear ( 18 ) which is integral in rotation with the rotating shaft ( 12 ) and has an external toothing facing the body ( 14 );   a ring gear ( 20 ) which is integral in rotation with the body ( 14 ) and has an internal toothing facing the axis of the primary disc ( 10 ); and   at least one planet gear ( 22 ) which is supported by the primary disc ( 10 ) so as to rotate about a secondary axis (y) which is parallel and not coincident with the axis of the primary disc ( 10 ), said at least one planet gear ( 22 ) being placed in an intermediate position between the sun gear ( 18 ) and the ring gear ( 20 ) so as to engage both and transmit a corresponding rotary motion from said sun gear ( 18 ) to said ring gear ( 20 ); the polishing and/or sanding head ( 9 ) further comprising a first support for a first treatment means ( 24 ) which is integral in rotation with the rotating shaft ( 12 ) and has a first exposed surface adapted to form or support a means suitable for polishing or sanding a surface to be treated, and a second support for a second treatment means ( 26 ) which is integral in rotation with the body ( 14 ) and has a second exposed surface adapted to form or support a means suitable for polishing or sanding said surface to be treated, said first support and said second support being configured, respectively, as a circular element and an annular element that are concentric to each other, the second support being designed to rotate in an opposite direction with respect to the direction of rotation of the first support.   
     
     
         2 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein said first support and said second support are configured to form or support a means suitable for polishing and/or sanding the surface to be treated that is made of painted metal or wood or stone or marble or ceramic. 
     
     
         3 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein at least one of the first exposed surface and the second exposed surface is formed at least partially from a felt cloth, or is configured to support a treatment means formed at least partially from a felt cloth. 
     
     
         4 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein at least one of the first exposed surface and the second exposed surface is formed at least partially from an expanded polymer cloth, or is configured to support a treatment means formed at least partially from an expanded polymer cloth. 
     
     
         5 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the first exposed surface and the second exposed surface are mutually coplanar. 
     
     
         6 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the rotating shaft ( 12 ) comprises a flange rotatably supported by the primary disc ( 10 ) by means of a rolling bearing. 
     
     
         7 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the at least one planet gear ( 22 ) is supported by the primary disc ( 10 ) so as to be rotatable about a secondary axis (y) by means of a pin ( 23 ) fixed to said primary disc ( 10 ), such that the secondary axis (y) is fixed in rotation with respect to the axis of the primary disc ( 10 ). 
     
     
         8 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the at least one planet gear ( 22 ) comprises three planet gears ( 22 ) circumferentially equidistant along the primary disc ( 10 ). 
     
     
         9 . The polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the primary disc ( 10 ) is configured to couple to a portable apparatus equipped with a power take-off coupled to the rotating shaft ( 12 ). 
     
     
         10 . The polishing and/or sanding head ( 9 ) according to  claim 9 , wherein the primary disc ( 10 ) is configured to couple to a handheld power tool for polishing and/or sanding car bodies. 
     
     
         11 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein at least one of the first exposed surface and the second exposed surface is formed at least partially from a felt cloth, or is configured to support a treatment means formed at least partially from a felt cloth. 
     
     
         12 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein at least one of the first exposed surface and the second exposed surface is formed at least partially from an expanded polymer cloth, or is configured to support a treatment means formed at least partially from an expanded polymer cloth. 
     
     
         13 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the first exposed surface and the second exposed surface are mutually coplanar. 
     
     
         14 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the rotating shaft ( 12 ) comprises a flange rotatably supported by the primary disc ( 10 ) by means of a rolling bearing. 
     
     
         15 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the at least one planet gear ( 22 ) is supported by the primary disc ( 10 ) so as to be rotatable about the secondary axis (y) by means of a pin ( 23 ) fixed to said primary disc ( 10 ), such that the secondary axis (y) is fixed in rotation with respect to the axis of the primary disc ( 10 ). 
     
     
         16 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the at least one planet gear ( 22 ) comprises three planet gears ( 22 ) circumferentially equidistant along the primary disc ( 10 ). 
     
     
         17 . The polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the primary disc ( 10 ) is configured to couple to a portable apparatus equipped with a power take-off coupled to the rotating shaft ( 12 ). 
     
     
         18 . The polishing and/or sanding head ( 9 ) according to  claim 17 , wherein the primary disc ( 10 ) is configured to couple to a handheld power tool for polishing and/or sanding car bodies. 
     
     
         19 . A portable apparatus equipped with a power take-off, the portable apparatus comprising the polishing and/or sanding head ( 9 ) according to  claim 1 , wherein the primary disc ( 10 ) of the polishing and/or sanding head ( 9 ) is coupled to the portable apparatus and the rotating shaft ( 12 ) of the polishing and/or sanding head ( 9 ) is coupled to the power take-off of the portable apparatus. 
     
     
         20 . The portable apparatus according to  claim 19 , wherein the portable apparatus is embodied as a handheld power tool for treating painted surfaces of cars, in particular for polishing and/or sanding car bodies. 
     
     
         21 . A portable apparatus equipped with a power take-off, the portable apparatus comprising the polishing and/or sanding head ( 9 ) according to  claim 2 , wherein the primary disc ( 10 ) of the polishing and/or sanding head ( 9 ) is coupled to the portable apparatus and the rotating shaft ( 12 ) of the polishing and/or sanding head ( 9 ) is coupled to the power take-off of the portable apparatus. 
     
     
         22 . The portable apparatus according to  claim 21 , wherein the portable apparatus is embodied as a handheld power tool for treating painted surfaces of cars, in particular for polishing and/or sanding car bodies.