METHOD AND DEVICE FOR INTEGRATING GEMSTONES IN GLASS

Abstract

A method and a device for encasing gemstones, such as diamonds, in glass. In order for their optical effects and appearance to be maximized, the gemstones are placed at a defined position and at a defined orientation. A suction cannula is provided for that purpose with an opening to fit the gemstone and to hold the gemstone by vacuum. Guide elements, such as spirals or meshes, are carried on the suction cannula so as to assure even distancing from the walls of the glass tube into which the gemstone is inserted.

Claims

1. A method of integrating a gemstone in a glass carrier, the method comprising the following steps: providing a glass body with an opening; aspirating the gemstone onto a head of a cannula by applying suction at an opposite end and establishing a vacuum at the head of the cannula; heating a base of the body of glass to a temperature at which the base becomes malleable; inserting the head of the cannula, with the gemstone aspirated thereon, through the opening in the glass body, and seating the gemstone in the malleable base; further heating the base and separating the base with the gemstone integrated therein from a remaining portion of the glass body.

2. The method according to claim 1, which comprises subsequently to seating the gemstone in the malleable base, interrupting the vacuum at the head of the cannula and withdrawing the head of the cannula without the gemstone.

3. The method according to claim 1, which comprises, subsequent to separating the base, further processing the separated base to form a final product being a glass figure with the gemstone incorporated therein.

4. The method according to claim 3, wherein the glass figure is a sphere with the gemstone centrally disposed inside the sphere.

5. A cannula device, comprising: an elongated hollow tube having a first end and a second end, said hollow tube being formed of a heat-resistant material that is resistant to temperatures used in a glass-blowing process; a head piece disposed on said first end, said head piece having a shape corresponding to a shape of a gemstone to be carried by said head piece, and said head piece having an opening formed therein communicating with said second end of said hollow tube; a plurality of spacers carried on said hollow tube and configured to guide said hollow tube centrally in an opening of a glass tube, for placing the gemstone carried by said head piece in a bottom of the glass tube; said spacers being formed of a heat-resistant material that is resistant to the temperatures used in the glass-blowing process.

6. The cannula device according to claim 5, wherein the shape of said head piece corresponds to a shape of a diamond.

7. The cannula device according to claim 5, wherein said spacers are formed of polytetrafluoroethylene (PTFE).

8. The cannula device according to claim 5, wherein said elongated hollow tube is a steel tube.

9. The cannula device according to claim 5, wherein said elongated hollow tube is a glass tube.

10. The cannula device according to claim 5, which further comprises a hilt disposed at said second end of said hollow tube, said hilt having a shape corresponding to a shape of an entry opening into the glass tube.

11. The cannula device according to claim 10, wherein said hollow tube has a length substantially equal to a length of said glass tube, such that, when said end piece is fully inserted into the glass tube and the gemstone is being seated in the base of the glass tube, said hilt comes to rest on the entry opening of the glass tube.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

[0031] FIG. 1 is a schematic view of a prior art process of incorporating a gemstone in a glass tube; and

[0032] FIG. 2 is a perspective view of a suction cannula for inserting a gemstone into a glass tube.

DETAILED DESCRIPTION OF THE INVENTION

[0033] Referring now to the figures of the drawing in detail and first, particularly, to FIG. 1 thereof, there is shown an illustration of the prior art, as represented by my earlier disclosure WO 2006/128208 A1 (PCT/AT2006/000224). A gemstone 3 is simply dropped into a glass tube 1. The base 4 of the glass tube 1 is heated by a gas flame 2. The final resting position of the gemstone is completely arbitrary and its proper, desired effect is not ensured. As noted above, the proper orientation of the gemstone 3 relative to the glass tube is essential so that the best reflective features and the maximum ornamental effect can be achieved.

[0034] FIG. 2 shows a device according to the invention with which the desired, defined positioning can be achieved. A suction cannula 6 has an end piece 5 that matches the shape of the gemstone 2. The end piece 5, or head, is milled so that its shape is the shape for a gem and so that the cannula 6 can hold the gem 2 in place. For that purpose, the end piece 5 is formed with a suction opening 7 through which a vacuum is applied through the cannula pipe.

[0035] The end piece 5 is formed to have a shape that corresponds to that of the upper portion (i.e., in its final position) of the gemstone 3. In the case of diamonds, one end piece 5 is provided for each carat weight of diamond and for each diamond cut. In the alternative, the shape of the end piece 5 may also be generalized so that it will securely and reliably hold any of a variety of gemstones in proper alignment. The end piece 5 must be formed of a material that will withstand the elevated temperatures necessary for the melt-integration of the gemstone 3 into glass. As noted, the end piece 5 is formed with a suction opening 7 in its center which communicates with the central pipe opening of the cannula 6.

[0036] In production, the cannula 6 is connected to a vacuum pump. The vacuum suction impacts the gemstone 3 through the cannula 6 and the opening 7. The atmospheric pressure pushes the gemstone 3 against the holding surface of the end piece 5 until the vacuum pump is either disconnected or turned off. It is important, of course, that the gemstone 3 is properly retained until it is properly placed in the heated base 4 of the glass tube 1.

[0037] The base of the glass tube 1 is heated to a degree of malleability that allows the gemstone 3 to be pushed into its seating. Once it is seated, the vacuum is interrupted and the cannula 6 with its head piece 5 is withdrawn. At that time, the glass is further heated to fully melt and remove the base 4 with the integrated gemstone 3 from the remaining glass tube 1.

[0038] It is critically important in the context that any air bubbles and other impurity inclusions be avoided. For that purpose, very clean glass is provided and the gemstone is cleaned in an ultrasound bath prior to its insertion. It is also critically important that the processing temperatures be finely adjusted. Too little heat, of course, renders it nearly impossible to properly insert the gemstone. Too much heat will cause the gemstone 3 to become blind, when it will appear grey. Too much heat will cause air bubbles to be formed.

[0039] The temperatures used in the process depend on the type of glass that is used. Typical borosilicate glass, which is typically used in glass-blowing, has a malleable processing temperature at around 1,000 C. (1830 F.). Soda lime glass (SLG) has a lower processing temperature around 800 C. (1470 F.).

[0040] In a preferred implementation, there is used a borosilicate glass that is resistant to acid, that can take high processing temperatures, and that tends not to form bubbles during processing. The preferred gemstone is diamond and the preferred cut for the diamond is a 58-facet cut. The product is preferably used for pendants, for earrings, for rings, and for bangles.

[0041] I have found that the temperatures for the inventive process should be kept to a minimum. That is, best results in terms of the clarity of the resulting product and of the efficiency of the process are achieved by minimizing the processing temperatures.

[0042] The cannula 6 is provided with guide elements 8 that guide the cannula 6 inside the glass pipe 1. The guide elements, or guides 8, may be mesh rings, clips, or a helical spiral. The guide elements, or guide element 8, are formed of highly heat-resistant material, such as PTFE (polytetrafluoroethylene, Teflon). The heat resistivity of the guides 8 is adapted so that they can safely withstand the temperatures that are necessary for the heating of the glass.

[0043] The length of the glass tube 1 and of the cannula 6 are adapted to one another. The gemstone 3 comes to rest in its proper position in the base of the glass tube 1 when the cannula 6 is inserted up to its hilt 10.

[0044] Once the gemstone has been placed and the glass of the base 4 has been molten so as to fully encase the gemstone without any air bubble inclusions, the base 4 is separated from the glass pipe 1. The resulting separate piece is a glass blob or graft with the gemstone enclosed. Then a very thin glass stem is attached to the glass blob by melting. Then the product is further processed, depending on its final design. For instance, in order to form a sphere, the further processing resembles that of forming a marble. The glass blob is shaped in a variety of molds, always by rotating. In some cases it may be necessary to attach the glass stem at a different point for further processing. Also, glass will be added or removed from the product during its shaping.

[0045] Once the final shape has been reached, such as a sphere, the thin glass stem is removed by melting. At this point, the product is held by way of tweezers so that the remaining material at the point where the stem was attached can be melted.

[0046] It a color addition is requested, the product is subjected to a further processing step. After the final shaping, the product is annealed in a lehr to slowly cool down.

[0047] The following is a summary list of reference numerals and the corresponding structure used in the above description of the invention: [0048] 1 glass tube [0049] 2 gas flame [0050] 3 gemstone [0051] 4 base of glass tube [0052] 5 head piece of cannula [0053] 6 cannula [0054] 7 aspiration opening [0055] 8 spacer guide [0056] 10 hilt of cannula