Method of making products of precious materials and wearable multicolor ornamental articles manufactured with such products

Abstract

A method of making a multicolor product ( 1, 11; 22, 23 ) with longitudinal development of precious material adapted to be used for manufacturing wearable ornamental articles such as armlets, necklaces, and the like is disclosed comprising the following steps: providing a coated wire ( 3 ) consisting of a central element ( 4, 17 ) of precious metal material covered by one or more external coaxial sheaths ( 5,18; 19 ), each of said sheaths being obtained by helical winding of a covering wire ( 5 a ) made of precious material of a different color relative to the color of the material of the central element ( 4, 17 ); manufacturing an unfinished product ( 7, 15, 21 ) with longitudinal development using the coated wire ( 3 ) on which one or more mechanical workings are carried out; removing material from one or more zones ( 10 ) of the unfinished product ( 7, 15, 21 ) for a depth sufficient to make visible one or more of the underlying materials of different colors constituting the sheaths of the coated wire ( 3 ).

1 ) A method of making a multicolor product ( 1 ;  11 ;  22 ,  23 ) with longitudinal development of precious material adapted to be used for manufacturing wearable ornamental articles such as armlets, necklaces and the like, wherein it comprises the following steps: 
 providing a coated wire ( 3 ) consisting of a central element ( 4 ,  17 ) of precious metallic material covered by one or more external coaxial sheaths ( 5 ,  18 ;  19 ), each sheath being obtained by helical winding of a covering wire ( 5   a ) made of precious material of a different color relative to the color of the material of the central element ( 4 ,  17 );    manufacturing an unfinished product ( 7 ,  15 ,  21 ) with longitudinal development using at least one of said coated wires ( 3 ) on which one or more mechanical workings are carried out;    removing material from one or more zones ( 10 ) of said unfinished product ( 7 ,  15 ,  21 ) for a depth sufficient to make visible one or more of said underlying materials of different colors constituting said one or more sheaths of said coated wire ( 3 ).    
     
     
         2 ) The method according to  claim 1  wherein said manufacturing step of said unfinished product ( 7 ,  15 ,  21 ) provides for use of one or more of said coated wires ( 3 ) jointly with said non coated wire.  
     
     
         3 ) The method according to  claim 1  wherein said manufacturing step of said unfinished product comprises the step of cutting to size said coated wire ( 3 ) to obtain a cut piece ( 8 ).  
     
     
         4 ) The method according to  claim 1  wherein said manufacturing step of said unfinished product ( 7 ,  15 ,  21 ) comprises the following stages: 
 cutting to size at least said coated wire ( 3 ) to obtain a plurality of cut pieces ( 8 ); and  
 closing each of said cut pieces ( 8 ) to form a ring linking them together to obtain a chain ( 7 ).  
 
     
     
         5 ) The method according to  claim 1  wherein said manufacturing step of said unfinished product ( 7 ,  15 ,  21 ) comprises the following stages: 
 rolling said coated wire ( 3 ) to obtain a strap ( 12 ) with generally polygonal section;  
 winding said strap ( 12 ) to define a tubular element ( 13 ) formed by a plurality of mutually juxtaposed spirals;  
 shaping said tubular element ( 13 ) according to the form of a mold.  
 
     
     
         6 ) The method according to  claim 5  wherein after said winding stage of said strap ( 12 ) and before said shaping stage of said tubular element ( 13 ), the operation of threading a flexible core ( 14 ,  20 ) into said tubular element ( 13 ) is carried out.  
     
     
         7 ) The method according to  claim 1  wherein said material removing step consists in a milling operation with a rotary tool ( 9 ,  16 ) provided with a diamond ( 9   a ,  16   a ).  
     
     
         8 ) The method according to  claim 1  wherein said material removing step consists in a brushing operation through a rotary tool.  
     
     
         9 ) An ornamental article made by using said multicolor product ( 1 ,  11 ,  22 ,  23 ) with longitudinal development obtained by the method according to  claim 1 , wherein it comprises one or more cut pieces of said multicolor product ( 1 ,  11   22 ,  23 ) with longitudinal development, to be closed as a ring through closure elements to be mutually connected and arranged at the ends of said one or more cut pieces.  
     
     
         10 ) The ornamental article according to  claim 9  wherein said multicolor product ( 1 ) is a chain of the gourmet type.  
     
     
         11 ) The ornamental article according to  claim 9  wherein said multicolor product is a chain of the type with marine link.  
     
     
         12 ) The ornamental article according to  claim 9  wherein said multicolor product ( 11 ,  22 ) is a wound string.  
     
     
         13 ) The ornamental article according to  claim 9  wherein it consists of a necklace.  
     
     
         14 ) The ornamental article according to  claim 9  wherein it consists of an armlet.