Spreizwerkzeug und Verfahren zur Herstellung eines Hohiringes under Verwedung einer Spreizvorrichtung

Abstract

A spreading tool ( 4 ) for widening a jewelry ring, in particular for pressing an inner ring portion ( 24 ) into an outer ring portion ( 26 ) of a hollow ring ( 22 ), has a plurality of spreading jaws ( 10 ), the insides ( 48 ) of which bound a receiving space ( 50 ), into which a spreading body ( 52 ) can be inserted for spreading open the spreading jaws ( 10 ), and which form on the outsides ( 34 ) thereof a plurality of coaxial ring receptacles ( 32 ) each being bounded radially inwardly by circumferentially disposed wall sections ( 36 ) of the spreading jaws ( 10 ). The ring receptacles ( 32 ) have diameters (Dn) that decrease relative to one another toward a free end ( 40 ) of the spreading jaws ( 10 ), characterized in that the spreading jaws ( 10 ) bound the ring receptacles ( 32 ) on both sides also in the direction of a main axis (A).

1 . A spreading tool ( 4 ) for widening a jewelry ring, in particular for pressing an inner ring portion ( 24 ) into an outer ring portion ( 26 ) of a hollow ring ( 22 ),
 having a plurality of spreading jaws ( 10 ), the insides ( 48 ) of which bound a receiving space ( 50 ), into which a spreading body ( 52 ) can be inserted for spreading open the spreading jaws ( 10 ),   and which form on the outsides ( 34 ) thereof a plurality of coaxial ring receptacles ( 32 ) each being bounded radially inwardly by circumferentially disposed wall sections ( 36 ) of the spreading jaws ( 10 ),   wherein the ring receptacles ( 32 ) have diameters (Dn) that decrease relative to one another toward a free end ( 40 ) of the spreading jaws ( 10 ),   characterized in that the spreading jaws ( 10 ) bound the ring receptacles ( 32 ) on both sides also in the direction of a main axis (A).   
     
     
         2 . A spreading tool according to  claim 1 , characterized in that the ring receptacles ( 32 ) are bounded by adjacently disposed concave grooves ( 38 ) that are recessed into the circumferentially disposed wall sections ( 36 ). 
     
     
         3 . A spreading tool according to  claim 2 , characterized in that the concave grooves ( 38 ) each have a groove bottom ( 42 ) that forms a circular-segment-shaped section ( 44 ) in cross section. 
     
     
         4 . A spreading tool according to  claim 3 , characterized in that the circular-segment-shaped section ( 44 ) defines a radius of less than 25 mm. 
     
     
         5 . A spreading tool according to  claim 1 , characterized in that the ring receptacles ( 32 ) are bounded by at least six circumferentially disposed spreading jaws ( 10 ). 
     
     
         6 . A spreading tool according to  claim 1 , characterized in that the spreading jaws ( 10 ) form at least seven ring receptacles ( 32 ) having different diameters (Dn). 
     
     
         7 . A spreading device ( 2 ) having a spreading tool ( 4 ) according to  claim 1  and a spreading body ( 52 ) capable of being pressed into the receiving space ( 50 ) created by the spreading jaws ( 10 ), characterized in that a bearing unit ( 8 ) for detachable fastening of the spreading tool ( 4 ) is provided. 
     
     
         8 . A spreading device according to  claim 7 , characterized in that the spreading tool ( 4 ) is capable of being fixed in a vertical orientation on the bearing unit ( 8 ). 
     
     
         9 . A spreading device according to  claim 7 , characterized in that the spreading tool ( 4 ) forms on a bearing end ( 12 ) opposite the free end ( 40 ) of the spreading jaws ( 10 ) a bearing collar ( 14 ) and that the bearing unit ( 8 ) has a threaded sleeve ( 6 ) by means of which the bearing collar ( 14 ) can be fastened with screws to the remaining spreading device ( 2 ). 
     
     
         10 . A method for producing a hollow ring ( 22 ) using a spreading device ( 2 ) according to  claim 1 , characterized in that a first ring portion ( 24 ) and a second ring portion ( 26 ) slipped thereon of the hollow ring ( 22 ) to be produced are placed into one of the ring receptacles ( 32 ) of the spreading tool ( 4 ) and the first ring portion ( 25 ) is pressed into the second ring portion ( 26 ) by pressing the spreading body ( 52 ) into the receiving space ( 50 ) created by the spreading jaws ( 10 ). 
     
     
         11 . A production method according to  claim 10 , characterized in that interlocking means ( 28 ) are provided on an outer surface of the first ring portion ( 24 ), which interlocking means ( 28 ) are brought into engagement with mating interlocking means ( 30 ) of the second ring portion ( 26 ) while the first ring portion is being spread open ( 24 ). 
     
     
         12 . A jewelry ring ( 101 ) produced in a method according to  claim 10 ,
 having at least one outer body ( 102 ) od cylindrical shape,   at least one inner body ( 103 ) capable of being inserted into the interior of the outer body ( 102 ),   an outer interlocking means that forms on both ends of the outer body ( 102 ) at least one outer stop ( 121 ),   at least one outer cavity ( 123 ) of the outer body ( 102 ) recessed into an inside of the outer body ( 102 ),   wherein on an outside of the inner body ( 103 ) at least one inner cavity ( 132 ) is recessed into the inner body ( 102 ) and an inner interlocking means having at least one inner stop ( 131 ) is formed that is capable of being joined in an interlocking manner by means of a spreading-force being exerted onto the inner body to the outer stop ( 121 ) of the outer interlocking means.   
     
     
         13 . A jewelry ring according to  claim 12 , characterized in that at least one support ( 122 ) for stabilizing the outer body ( 102 ) with respect to external forces is provided. 
     
     
         14 . A jewelry ring according to  claim 12 , characterized in that the outer body ( 102 ) has on the outside thereof a design or a pattern. 
     
     
         15 . A jewelry ring according to  claim 12 , characterized in that the outer stops ( 121 ) are formed coaxial to the remaining outer body ( 102 ). 
     
     
         16 . A jewelry ring according to  claim 12 , characterized in that the outer body ( 102 ) and the outer stops ( 121 ) are formed integrally. 
     
     
         17 . A jewelry ring according to  claim 13 , characterized in that the support ( 122 ) on the inside of the inner body ( 103 ) is disposed symmetrically, offset or inclined circumferentially with respect to same and the outer stops ( 121 ). 
     
     
         18 . A jewelry ring according to  claim 13 , characterized in that the outer body ( 102 ), the stops ( 121 ) formed on the inside thereof, and the at least one support ( 122 ) are formed so as to be coaxial. 
     
     
         19 . A jewelry ring according to  claim 13 , characterized in that the support ( 122 ) formed on the inside of the outer body ( 102 ) is formed cylindrical, square or triangular. 
     
     
         20 . A jewelry ring according to  claim 13 , characterized in that the inside of the outer body ( 102 ) is formed concave and that the at least one support ( 122 ) is disposed thereon. 
     
     
         21 . A jewelry ring according to  claim 12 , characterized in that the inner body ( 103 ) is formed annular and coaxial to the at least one inner support ( 131 ). 
     
     
         22 . A jewelry ring according to  claim 12 , characterized in that in order to stabilize both the outer body ( 102 ) and the inner body ( 103 ) at least one second support ( 122 ) is additionally also provided on the outside of the inner body ( 103 ). 
     
     
         23 . A jewelry ring according to  claim 22 , characterized in that the second support ( 122 ) is disposed in a cylindrical cavity recessed into the outside of the inner body ( 103 ). 
     
     
         24 . A jewelry ring according to claim  22 , characterized in that the second support ( 122 ) is disposed on the outside of the inner body ( 103 ) symmetrically, offset or inclined circumferentially relative to same. 
     
     
         25 . A jewelry ring according to  claim 22 , characterized in that the second support ( 122 ) formed on the outside of the inner body ( 103 ) is formed cylindrical, square or triangular. 
     
     
         26 . A jewelry ring according to  claim 22 , characterized in that the outside of the inner body ( 103 ) is formed concave, and that the at least one second support ( 122 ) is disposed thereon. 
     
     
         27 . A multi-part jewelry ring including at least one jewelry ring according  claim 12 , comprising:
 a hollow, cylindrical inner body ( 103 ),   at least two terminating rings ( 104 ) each mounted onto the inner body ( 103 ) on an end thereof,   at least one outer body ( 102 ) mounted between the two terminating rings ( 104 ) onto the inner body ( 103 ),   at least one inner cavity ( 132 ) of the inner body ( 103 ) recessed into the inner body ( 103 ),   at least one cavity ( 123 ) of the outer body ( 102 ) recessed into the outer body ( 102 ),   wherein the inner interlocking means has on both ends thereof at least one inner stop ( 131 ) for affixing the terminating rings ( 104 ).   
     
     
         28 . A multi-part jewelry ring according to  claim 27 , characterized in that the inner body ( 103 ), in order to prevent contact of the ends with a finger, has on the inside thereof between both ends a convex shape. 
     
     
         29 . A multi-part jewelry ring according to  claim 27 , characterized in that the terminating rings ( 104 ) surround the ends of the inner body ( 104 ) and are each firmly connected to an inner stop ( 131 ) of the inner interlocking means, and
 on the inner body ( 103 ) parallel to the inner stops ( 131 ) at least one support ( 122 ) is provided to form voids between the outer body ( 102 ) and the inner body ( 103 ), in order to reduce the weight of the ring.   
     
     
         30 . A multi-part jewelry ring according to  claim 27 , characterized in that the outer bodies in cross section ( 102 ) have any desired geometric shape. 
     
     
         31 . A multi-part jewelry ring according to  claim 27 , characterized in that the outer bodies are supported on the inside and are thereby secured against forces acting from the outside and against rotation that would be annoying to the user.