Collet for precious stones

Abstract

A collet system for embedding and clamping precious and non-precious stones on a support to create a jewel where the stone is mounted, characterised in that the collet ( 1, 21, 30 ) is made up of a straight or round polygonal closed contour having various projections ( 2 22, 32 ) towards the outside and the inside alternatively; in that vertical grooves ( 3, 23, 31 ) are made in said projections towards the inside from bottom to top, such grooves not reaching the upper face of the collet ( 1, 21 ) or having a narrow dimension, thus creating a shape or dimensional shoulder towards the tops; in that such grooves ( 3, 23 ) have to precisely hold and clamp a cylindrical pin ( 5, 25, 35 ) having dimensions matching the grooves ( 3, 23, 21 ) to clamp the stone ( 8, 28, 38 ).

1 . Collet system for embedding and clamping precious and non-precious stones on a support to create a jewel where the stone is mounted, characterised in that the collet ( 1 , 21 , 30 ) is made up of a straight or round polygonal closed contour having various projections ( 2 ,  22 ,  32 ) towards the outside and the inside alternatively; in that vertical grooves ( 3 ,  23 ,  31 ) are made in said projections towards the inside from bottom to top, such grooves not reaching the upper face of the collet ( 1 ,  21 ) or having a narrow dimension, thus creating a shape or dimensional shoulder towards the top; in that such grooves ( 3 ,  23 ) have to precisely hold and clamp a cylindrical pin ( 5 ,  25 ,  35 ) having dimensions matching the grooves ( 3 ,  23 ,  31 ) to clamp the stone ( 8 ,  28 ,  38 ).  
   
   
       2 . Collet system according to  claim 1 , characterised in that the vertical grooves ( 3 ,  23 ) are opened towards the inside of the collet ( 1 ,  21 ) with a round clamping section.  
   
   
       3 . Collet system according to  claim 1 , characterised in that the vertical grooves are cylindrical ( 3 ,  23 ) and the pins ( 5 ,  25 ,  35 ) are slightly conical and bell-mouthed ( 31 ).  
   
   
       4 . Collet according to one of the claims from  1  to  3 , characterised in that the vertical grooves ( 3 ) are opened towards the inside of the collet ( 1 ) according to a pin containing angle greater than 180 degrees and they precisely hold and clamp a single cylindrical clamping pin ( 5 ) whose dimensions match the grooves or hollows ( 3 ).  
   
   
       5 . Collet system according to  claim 1 , characterised in that the pins ( 5 ,  25 ), and or the grooves ( 3 ,  23 ) have a double cylinder cross-section.  
   
   
       6 . Collet system according to  claim 1 , characterised in that the pins ( 5 ,  25 ), and/or grooves ( 3 ,  23 ) have a round cross-section with a rectangular gib.  
   
   
       7 . Collet system according to  claim 1 , characterised in that the pins ( 5 ,  25 ), and/or grooves ( 3 ,  23 ) have a cross-section in the shape of a cam or droplet.  
   
   
       8 . Collet system according to  claim 1 , characterised in that the grooves ( 31 ) are made in the internal projections ( 32 ) of the contour of the collet ( 30 ) from bottom to top, reaching the upper side of the collet, but tapering from bottom to top narrowing before they reach the upper side ( 34 ) of the collet, thus making a dimensional shoulder towards the top; in that the pins ( 35 ) are adapted to the grooves ( 31 ,  31 ′) that have to hold them, and narrow in their outside from bottom to top; and in that in their upper inner part the pins ( 35 ) contain both the upper and the lower part of the hollows ( 37 ) clamping the stone ( 38 ).  
   
   
       9 . Collet system according to  claim 8 , characterised in that the grooves ( 31 ) are made in dihedral section from bottom to top with an angle greater than 90 degrees.  
   
   
       10 . Collet system according to  claim 8 , characterised in that the tapered grooves ( 31 ) are obtained by applying “appliques” ( 31 ′) on vertical hollows ( 31 ), applied already in projections ( 32 ).  
   
   
       12 . Embedding and clamping procedure of precious and non-precious stones on a support to create a jewel where the stone is mounted, characterised in that the stone ( 8 ,  28 ,  38 ) is embedded inserting it from the bottom in a collet ( 1 ,  21 ,  30 ) made up of a straight or round polygonal closed contour and of projections ( 2 ,  22 ,  32 ) towards the outside and the inside alternatively; in said projections towards the inside being made cylindrical vertical grooves ( 3 ,  23 ,  31 ) from bottom to top, such grooves being incomplete or tapered thus creating a shoulder towards the top; and in that the stone is then clamped through the accurate introduction in each groove ( 3 , 23 , 31 ) of a cylindrical pin ( 5 ,  25 ,  35 ) whose dimensions match those of the grooves ( 3 ,  23 ,  31 ), to clamp the stone ( 8 ,  28 ,  38 ).  
   
   
       13 . Embedding procedure of stones according to  claim 9 , characterised in that the cylindrical vertical grooves ( 3 ,  23 ,  31 ) and the pins ( 5 ,  25 ,  35 ) are slightly conical or bell-mouthed.