US20040172972A1

US20040172972A1 - Textured surface rope chain and method for the fabrication thereof

Info

Publication number: US20040172972A1
Application number: US10/382,734
Authority: US
Inventors: Rony Steinberg
Original assignee: Talmor Jewelry Ltd
Current assignee: Talmor Jewelry Ltd
Priority date: 2003-03-05
Filing date: 2003-03-05
Publication date: 2004-09-09

Abstract

A jewelry rope chain formed of embossed solid or hollow links. A link wire is passed through dice to create a flattened wire having the large surfaces which are embossed. The wire is wrapped on a mandrel so that the small faces contact the mandril, creating a spiral that cut into individual links. When the links are interassembled, the embossed surfaces are in contact and juxtaposed to one another with only their top portions visible, creating a unique effect and appearance.

Description

BACKGROUND OF THE INVENTION

The present invention relates to rope chain jewelry and, more specifically, to rope chains made of rope chain links with an embossed, textured surface.

A rope chain is a chain in the form of a rope constituted by an intricate series of open rings or links that are linked with one another to define a configuration similar to continuous double-stranded rope. Rope chains made of solid rings or links are simply known as rope chains, while those made of hollow rings or links are known as “hollow rope chains.”

Methods for fabricating rope chains and machines therefor are known in the prior art as exemplified by U.S. Pat. No. 515,959, the contents of which are incorporated by reference herein. A thorough discussion of a conventional rope chain known as “diamond cut rope chains” is provided in U.S. Pat. No. 5,125,225, the contents of which are similarly incorporated by reference herein.

Further descriptions of various types of rope chains and a variety of different rings or links of which rope chains are made is provided in U.S. Pat. Nos. 5,285,625; 4,651,517; and Des. 343,806. The contents of the aforementioned patents are also incorporated by reference herein.

The basic construction and components of prior art rope chains is shown in prior art FIGS. 1-3, 4 a-4 g, 5 a-5 b and 6 a-6 b. Prior art FIG. 1 illustrates a pre-assembled rope chain 10 constituted by an intricate series of open rings or links 12 in which adjacent rings are interlinked to define a configuration similar to a continuous double-stranded rope. More specifically, the completed chain is comprised of a first, continuous strand of links 14 intertwisted with a second continuous strand 16, as shown in FIG. 2. The rope chain 10 is pre-assembled, either manually or automatically, by forming, feeding and interlinking the rings 12 and maintaining the shape thereof by reinforcing wires (not shown) which are threaded through it. Thereafter, the open rings are soldered to one another and the reinforcing wires are removed, enabling the chain 10 to hold its characteristic rope chain shape shown in FIG. 2.

As shown in prior art FIG. 3, each of the

links

12 in the rope chain of FIG. 2 is constructed of a round wire of a particular length that is bent into a circle, leaving a small gap 15. It is through the gap 15 that the links can be intertwined with one another.

In accordance with the known “diamond cutting” technique,

cuts

36 can be made on one side or both sides of the link 12 (relative to the gap 15), so that in the completed chain 10 these cut surfaces present highly reflective surfaces that add sparkle and luster to the completed chain 10.

FIG. 4 a shows the cross-section of the wire 13 of which the link 12 is made, showing it to have a circular, solid shape 13 a. However, the wire of the link 12 can have other cross-sectional shapes, for example, square 13 b (FIG. 4b); rectangular 13 c (FIG. 4c); hexagonal 13 d (FIG. 4d); horseshoe 13 e (FIG. 4e); circular hollow 13 f (FIG. 4f); and solid circular with an offset hollow channel 13 g (FIG. 4g). See also FIGS. 4h, 4 i and 4 j.

Prior art FIG. 5 a shows a link 12 a made of a wire having a stretched version of the rectangular cross-section shape 13 c shown in FIG. 4c.

The

link

12 a made of the rectangular wire has a larger sized front surface 17 a, a large rear surface 17 b (see FIG. 5d), a narrow top surface 17 c, and a narrow inner, bottom surface 17 d. The links 12 a are partially interassembled to begin constructing a rope chain as shown in FIG. 5b. This figure illustrates four links 12 a, identified as links A1, A2, A3 and A4, showing the successive links have their gaps 15 oriented in opposite directions.

The prior art is also knowledgeable of the expedient of constructing the

individual links

12 to have non-circular shapes such as a rectangular shape as illustrated in FIG. 6a or a rectangular shape as illustrated in FIG. 6b.

Rope chains are manufactured using a multiplicity of techniques depending on the type of rope chain being manufactured. Heavier, and thus more expensive, rope chains are manufactured using solid links as illustrated, for example, in prior art FIGS. 4 a-4 d. On the other hand, lighter, i.e., less expensive, rope chains are manufactured using links having hollow centers as shown, for example, in FIG. 4f.

Methods for producing hollow link rope chains are known in the art. Two main styles of rope chain links are those having a smooth outer surface, and those having an embossed texture on the outer surfaces of the links, for examples, at the locations of the

diamond cuts

36 shown with respect to the link of FIG. 3, and/or all around the link. Embossment add distinctive luster to the finished rope chain depending on the embossment pattern selected by the rope chain designer.

Rope chains are manufactured to a standard set of gauge sizes, for example, 9,12,14,15,18,23,25,30 and 40 gauge chains. In order the have the completed rope chains comply with a particular gauge size, a standard set of manufacturing set of tools and dies are used to fabricate the rope chain links.

To manufacture rope chain links made of gold tube filled with metal and/or hollow wire, e.g., similar to the cross-sectional wire shown in FIG. 4e, a flat, sheet-like and thin wire made of gold or silver typically of fourteen-carat gold, is pulled, along with a round metal wire positioned longitudinally along the center of the flat sheet-like wire, through a round die such that the flat metallic wire is wrapped around the internal metal wire, forming a cylindrical core of metal which is wrapped with the gold or silver sheet along the length of the cylindrical metal wire. The composite wire is transformed into links that are assembled into a rope chain. The completed chain is immersed in a chemical bath that dissolves the metal core, leaving only the gold, thus obtaining a rope chain made of hollow links.

Both hollow and solid rope chains can have their link surfaces embossed with various designs. However, when the embossments are imparted to the wire, they are invariably imparted and provided at the most visible outermost surfaces of the link wire. Nevertheless, there is a constant quest to evolve rope chain designs that have distinctive feel, character, look and artistic signature.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide a novel rope chain that is imbued with a luster and appearance that is different from those of known rope chains.

It is a further object of the invention to provide a novel rope chain having embossed surfaces that are unique in style and appearance.

It is yet another object of the invention to provide a novel rope chain with embossed or textured surfaces that is amenable to manufacture by using substantially standard processes and manufacturing equipment.

The foregoing objects of the invention are realized by a rope chain having textured surfaces. The rope chain is fabricated of a plurality of rope chain links, each of which is constructed of predefined length of a wire that has a given cross-sectional shape and first and second terminal ends which are bent towards one another, leaving a link gap. The plurality of links are interassembled to create a two-stranded rope chain with pairs of adjacent links joined, e.g., soldered, to one another to prevent disassembling of the links. The cross-sectional shape of the wire defines for each link, first and second large faces that extend parallel to one another and first and second small faces that extend generally transversely to the long faces. At least one of the large faces of each link (of a substantial number of the links) is textured and the links are so formed that each link has an interior perimeter defined by one of the small faces and an outer perimeter defined by the second of the small faces.

The interior periphery of the links can be either circular or non-circular. In a known manner, the interior periphery has a diameter that is less than three times the size of the height dimension of the large faces of the link. The rope chain of the invention can be fabricated in a large variety of gauge sizes, including sizes 9 and up.

The invention is also directed to the method of fabricating the above-described rope chain from either solid or hollow links, starting with a cross-sectional link wire shape that can be circular, square, rectangular, and a large number of other wire cross-sectional shapes.

Other features and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a partially assembled rope chain in accordance with the prior art. [0024]
FIG. 2 shows a fully assembled rope chain in accordance with the prior art. [0025]
FIG. 3 shows one of the links of the rope chain of FIG. 2. [0026]
FIGS. 4[0027] a-4 j show the cross-sectional shapes of known link wires of which prior art links have been made.
FIG. 5[0028] a shows a prior art link made of highly rectangular wire.
FIG. 5[0029] b perspectively shows a partially-assembled rope chain made of the link of prior art FIG. 5a.
FIG. 6[0030] a-6 b show non-circular prior art links.
FIG. 7 shows a method of fabricating a rectangular cross-sectional link wire that bears textured or embossed designs in accordance with the present invention. [0031]
FIG. 7[0032] a shows a stamping device for creating the textured or embossed designs.
FIG. 8 shows a link wire resulting from the process illustrated in FIG. 7. [0033]
FIG. 9 shows a prior art mandrel that is used in the fabrication of rope chain links. [0034]
FIG. 10 shows the wire of FIG. 8 wound up on the mandrel of FIG. 9 to create the novel links of the present invention. [0035]
FIG. 11[0036] a shows a link bearing the surface embossments in accordance with the present invention.
FIG. 11[0037] b shows a partially-assembled rope chain made of the embossed links of the present invention.
FIG. 11[0038] c shows a link bearing the surface embossments in accordance with the present invention.
FIG. 12[0039] a depicts the prior art cross-sectional shape of a hollow wire used for fabricating links.
FIG. 12[0040] b shows the link of 12 a with the core removed and the wire reshaped to obtain the surface textures shown in FIG. 8.
FIG. 13 is a perspective of a rope chain constructed in accordance with the present invention.[0041]

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

With reference to FIG. 7, in accordance with the method of the present invention, an [0042] ordinary link wire 13 made of solid gold or of silver and having a circular cross-section is processed by stamping dies 3 a and 3 b and/or between a pair of dies including a left hand die 4 a and a right hand die 4 b which are separated from one another by the requirement for a particular link thickness, while the dies rotate in opposite directions. That is, the left hand die is rotated counterclockwise while the right hand die is rotated clockwise to pull therebetween the originally round wire 13. Since the outer peripheral surface of the dies 4 a and 4 b are jagged and shaped to impart to the surface of the link a complementary embossment shape 8, the resulting wire emerges out substantially rectangular as indicated in FIG. 8 with the two larger surfaces 17 a and 17 b bearing the embossments. The narrow surfaces 17 c and 17 d remain unembossed, as shown in FIG. 8. The wire 13 is thus formed as a very long wire 19 that has a thickness which is defined by the narrow surfaces 17 c and 17 d. The final, shaped wire 19 need not be perfectly rectangular and, indeed, the emphasis is that it has a height dimension which is substantially greater than a width dimension. Therefore, it can also be, for example, in the shape shown in FIG. 4h, 4 i and 4 j (albeit, with embossment or surface texturing formed thereon).
One of the additional benefits of the invention ensues from the fact that, as the [0043] wire 13 is pressed by the stamps 3 a, 3 b or by the dies 4 a and 4 b, both the thickness of the resulting wire 19 (FIG. 8), as well as height, are increased. This increase in the thickness of the wire can be appreciated from FIG. 7 which shows (in the plane of the paper) a wire that is thicker as it emerges from the dies 4 a and 4 b.
As a result, one can obtain a rope chain of a greater gauge, saving substantial amounts of precious metal, for example, gold. For example, a rope chain gauge [0044] 30 (4 millimeter diameter) which is obtained through this process of a certain gauge provided by a competitor weighs 1.158 grams pear one inch (this is the lightest one available in the market today), whereas a rope chain of the same gauge made by the process of the present invention weighs only 0.91 grams for an equal length of chain. This advantage is quite important.
That resulting [0045] wire 19 is wrapped on the mandrel 16, as shown in FIG. 9, with the narrow surfaces 17 c is in contact with the outer surface of the mandrel 16. This results in the spiral that is shown in FIG. 10 wrapped on the mandrel 16. In FIG. 10, none of the embossed surfaces 17 a and 17 b are seen. The exposed outer surface 17 c remains flat and unembossed.
In a known manner, the process is then continued by creating a slot in the spiral along the [0046] line 21 shown in FIG. 10. If the wrapped wire 19 is thereafter pushed off the mandrel, individual links are obtained, each of which has been formed into a link with the ends 15 a, 15 b (FIG. 11a), which face across the gap 15 not quite juxtaposed. However, in well known manner, when that link is placed against a flat surface and hammered, a link 12 a (FIG. 11a) is produced which carries the embossments 8 imparted by the dies 4 a and 4 b. When a rope chain is assembled of the links 12 a having the surface type shown in FIG. 1 la, a rope chain with the links shown in FIG. 11b is obtained.
It is well known in the art that although the surface texture of the [0047] links 12 a would not be visible when the links lie tightly against one another, the pair of links are separated from one another making the surface texture visible and creating a new type of luster and sparkle which is not familiar or known in the prior art, as shown in FIG. 13.
FIG. 12[0048] a shows a starting wire that is hollow but is in the form of a sheet of gold that is wrapped on an internal metal core 25. Once that wire is passed through the dies 4 a and 4 b of the present invention, the resulting wire shown in FIG. 12b assumes a substantially thin, sheet-like quality which allows it to be assembled as the links as shown in FIG. 1 I a except that the interior of the link is hollow, after the internal core is removed, saving substantial amounts of precious gold.
While both dies [0049] 4 a and 4 b are shown in FIG. 7 to have the embossing texture 6, the invention also comprises providing the embossing feature only one of the dies and leaving the other one flat so that the embossed design appears only on one side for example side 17 a of the individual links.
The invention also extends to the expedient of not only embossing or texturing the surface of the wire, but also applying to it a surface texture by other means, e.g., via a coating such as an enamel coating and the like. It is further noted that while the invention has been described so that the surface texturing is formed while the wire is formed in dies or in stamping presses, it is also possible to first form the desired wire shape and then impart texturing after the actual link is formed. [0050]
Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art. It is preferred, therefore, that the present invention be limited not by the specific disclosure herein, but only by the appended claims. [0051]

Claims

What is claimed is:

1. A jewelry chain constructed of links having textured side surfaces, the rope chain comprising:

a plurality of rope chain links, each link being constructed of a predefined length of a wire having a given cross-sectional shape and having first and second terminal ends bent to reach closely toward each other without touching, so as to leave a link gap;

a plurality of the links being interassembled to create a chain with the links so joined to prevent disassembly of the links;

the given cross-sectional shape of the wire defining for each link, first and second, large faces that extend substantially parallel to one another and first and second small faces extending generally transversely to the long faces; wherein

at least one of the large faces is textured and the links being so formed that each link has an interior perimeter defined by the first small face and an outer perimeter defined by the second small face.

2. The chain of claim 1, wherein the interior periphery of the links is circular.

3. The chain of claim 2, wherein the interior periphery has a diameter that is larger than three times the size of a height dimension of the large face of the link.

4. The chain of claim 1, wherein both of the first and second large faces are textured.

5. The chain of the previous claim, wherein the surface texturing is constituted by embossing the first and second large faces.

6. The chain of claim 1, wherein in an assembled and tightened condition of the chain, only a top portion of the embossment of one of the first and second large faces of each link is visible.

7. The chain of claim 1, wherein the interior perimeter of each link defines a non-circular shape.

8. The chain of claim 1, wherein the chain comprises a chain gauge size equal or greater than 9.

9. The chain of claim 1, where the chain is formed as a rope chain.

10. The chain of claim 1, in which the chain is a rope chain and in which the link wire has a width dimension that is greater than that of an original wire of which it is made due to the formation of the embossing, realizing a lighter weight rope chain.

11. A method of forming a rope chain having links with textured side faces, the method comprising the steps of:

forming a link wire shaped to have first and second large faces that extends substantially parallel to one another and first and second small faces that extend generally transversely to the large faces and imparting to at least one of the first and second large faces, an embossed texture;

wrapping the embossed wire around a mandrel to create a spiral embossed wire, the wire being wrapped in an orientation whereby one of the small faces contacts the mandrel and each of the large faces being juxtaposed to another large face in the spiral;

cutting the spiral embossed wire longitudinally to create a plurality of embossed patterned links; and

assembling the plurality of embossed patterned links to create a rope chain.

12. The method of claim 1 1, including embossing both the first and second large faces.

13. The method of claim 12, where the metallic wire has a cross-sectional shape selected from the cross-sectional group consisting of: circular, square, rectangular, polygonal, and circular with hollow interior.

14. The method of claim 1 1, including creating the metallic wire by first passing an elongate metallic sheet through a device to create an embossed surface thereon;

passing the embossed metallic sheet and a core wire through a die opening to create a metallic link wire whose outer surface is embossed;

passing the wire having the core wire therein through flattening dies to create a rectangular link wire so shaped that it includes first and second large faces that extend substantially parallel to one another and first and second small faces that extend generally transversely to the large faces; and thereafter carrying out the wrapping, cutting and assembling steps.

15. The method of claim 11, including the step of creating the textured surface on the wire in a manner which increases a thickness dimension thereof to realize a final rope chain that is lighter for any given gauge size.