ROTATION PREVENTING NECKLACE

Abstract: A necklace for preventing a connecting metal which should be positioned on the rear side from turning to the front side of the neck when it is worn, comprising a plurality of continuously arranged pieces and connecting metals provided at opposite ends of the pieces, characterized in that at least one piece among a plurality of pieces in the proximity of connecting metals is formed of a hollow member and the other pieces are formed of solid members.

Description: Technical field The present invention relates to a rotation-preventive necklace according to the pre-characterizing part of claim 1, in particular, one wherein connecting metal fittings of the necklace to be positioned on the rear side of neck are prevented from appearing on the front side with turning around the neck. Background technologies Generally, a necklace comprises unit pieces (koma in Japanese) arranged successively to make a chain and connecting metal fittings attached at both ends thereof, and is a personal ornament, which is used by hanging around neck and by connecting the connecting metal fittings at both ends between themselves. When wearing such a necklace, in particular, with a lot of similarly shaped pieces made from the same material and successively arranged, a necklace structured so that the portion of connecting metal fittings is relatively heavier than the portion of pieces, or the like, it often ended up to turn naturally around neck on wearing and the portion of connecting metal fittings comes to move to the front side of neck, thus giving an unseemly impression as a personal ornament. FR-A 560 102 discloses a pearl necklace having pearls of different diameter. The pearls of smaller diameter are provided on both sides near the connecting metal fittings and the pearls of larger diameter are provided opposite to the connecting metal fittings. Although it is not disclosed in FR-A 560 102 that this necklace has rotation-preventive properties it might be possible that the heavier pearls of larger diameter prevent the necklace from rotating. As a result of various investigations to solve such inconvenience, the invention provides a necklace that does not end up to turn around the neck on wearing. Disclosure of the invention Namely, the invention provides a rotation-preventive necklace, in which a plurality of pieces are successively arranged and provided with connecting metal fittings at both ends, characterized in that at least one or more of pieces neighboring the connecting metal fittings are formed with hollow members and other pieces are formed with members which are heavier than the members forming the at least one or more of pieces neighboring the connecting metal fittings. And, it is effective to form all pieces with the same material and in the same shape, or to use pieces having different shapes of plural types repeatedly in turn, respectively. Further, it is effective to form the respective pieces locating in the middle portion of necklace being less than approximately 1/3 of the overall length of the necklace with solid members and the respective pieces locating in the portion of both ends of said necklace being less than approximately 1/3 of the overall length of the necklace with hollow members. Moreover, it is also effective to use metal as a prime material of the pieces. Moreover, another embodiment of the rotation-preventive necklace of the invention is characterized in that, similarly shaped pieces are successively arranged in the necklace and the necklace is provided with connecting metal fittings at both ends, wherein the weight of pieces neighboring connecting metal fittings is made lighter than the weight of pieces in the middle portion. Moreover, another embodiment of the invention is a rotation-preventive necklace characterized in that, in the necklace are successively arranged a plurality of similarly shaped ring-like pieces by joining them to each other and the necklace is provided with connecting metal fittings at both ends, the pieces neighboring the connecting metal fittings are formed with pipe material and the pieces in the middle portion are formed with solid material of the same material as that of said pipe material. At this time, it is effective to fill a substance lighter than said pipe material, for example, aluminum, wax or resin inside the pipe material in the case of pipe material being gold, silver, brass or the like that is the quality of material used commonly for the personal ornament. Moreover, another embodiment of the invention is a rotation-preventive necklace characterized in that, in the necklace are successively arranged a plurality of similarly shaped ring-like pieces by joining them to each other and the necklace is provided with connecting metal fittings at both ends, the pieces neighboring the connecting metal fittings are formed with a pipe material filled Inside by a filler of light weight and the pieces in the middle portion are formed with the pipe material filled inside by a filler of heavy weight which is heavier than said filler of light weight. At this time, it is good to use heavy metal such as lead or copper as the filler of heavy weight in the case of the filler of light weight being light metal such as aluminum, wax or resin, but, in short, it is only necessary that weight of the filler in pieces of the middle portion is greater than the weight of the filler in pieces neighboring connecting metal fittings. Furthermore, another embodiment of the invention is a rotation-preventive necklace characterized in that, in the necklace are successively arranged a plurality of similarly shaped hollow pieces by joining them to each other and the necklace is provided with connecting metal fittings at both ends, the pieces in the middle portion are plated thereon more thickly than pieces neighboring connecting metal fittings. Brief description of the drawing Fig. 1 is a front view showing the necklace in Example 1 of the invention; Fig. 2(a) is a side sectional view showing the hollow member in Fig. 1; Fig. 2(b) is a side sectional view showing the solid member similarly; Fig. 3 is a front view showing one example of the necklace used Kihei (proper noun in Japanese) chain; Fig. 4 shows a clasp of the parts of fastening metal fittings, wherein (a) is a front view and (b) is a side view; Fig. 5 is a front view showing a plate of the parts of fastening metal fittings; Fig. 6 is a front view showing a connecting ring; Fig. 7 is a front view showing a Kihei chain; Fig. 8 is a side view showing a piece of a Kihei chain; Fig. 9 is a sectional view showing a solid piece of a Kihei chain used a round bar; Fig. 10 is a front view showing the necklace in Example 2 of the invention; and Fig. 11 is a sectional view showing a ring-like piece consisting of hollow pipe material filled with aluminum to be used for the Kihei chain of the necklace in Fig. 10. Best embodiment to put the invention into practice Example 1 A necklace successively arranged brassy spheres by threading of a center thread and provided with connecting metal fittings (1)(1) at both ends, respectively, as shown in Fig. 1 was fabricated. The pieces neighboring connecting metal fittings of this necklace, that is, pieces (2)(2) locating in a length up to about 1/3 of the overall length of said necklace from both ends of said necklace, respectively, are hollow spheres having a shape with passing holes (3) of center thread pierced up and down, as in Fig. 2(a), and pieces (4) locating in the middle portion of said necklace being in the portion of a length of about 1/3 of the overall length of said necklace are solid spheres having a shape with passing holes of center thread pierced through, as in Fig. 2(b). With such necklace on wearing around neck, the front side, that is, the underside is always heavier, hence, even if said necklace may be worn for a long time or may be undergone vibration, it does not end up to turn around neck. While all pieces have the same shape in this example, also with a necklace using pieces having different shapes of plural types repeatedly in turn, respectively, it can be intended similarly to prevent the rotation of said necklace around neck of the wearer by constructing the pieces neighboring connecting metal fittings with hollow members. Moreover, the extent of length over which the middle portion of necklace is practically constructed with solid members can be determined appropriately depending on the weight of connecting metal fittings that locate oppositely, quality of material, specific gravity, weight, etc. of each piece. Example 2 Fig. 3 shows a necklace used Kihei chain. The Kihei chain is made in such a way that a piece (6) molded a round bar (5), for example, with the quality of material of gold into ring-like shape as shown in Fig. 9 is connected in turn as shown in Fig. 7 and all of those connected ring-like pieces (6) are twisted in the same direction to give the twisting deformation to each piece (6), thereby producing a plate-shaped chain that was twisted in the same direction around on axis along connecting direction, as shown in Fig. 8. And, one example of this Kihei chain processed to necklace is shown in Fig. 3. Namely, connecting rings (8)(8') as in Fig. 6 are attached to both ends of Kihei chain (7), a plate (9) in Fig. 5 being one of the parts of fastening metal fittings is attached to one connecting ring (8) and a clasp (10) in Fig. 4 being another of the parts of fastening metal fittings is attached to other connecting ring (8') to make necklace. In the necklace used such Kihei chain, in the invention, pieces of hollow gold pipe with aluminum alloy (11) filled inside as shown in Fig. 11 were used for the ring-like pieces (6') over a length of about 1/3 of the overall length L from both ends of Kihei chain (7), respectively, and solid material of gold in Fig. 9 was used over about (1/3) L in the middle portion, as shown in Fig. 10. The reason why such ring-like pieces (6') filled inside with the filling material lighter than the pipe material are used is that, by filling said aluminum, resin or others, it is possible to prevent the hollow gold pipe from being collapsed at bending portion when making said ring-like pieces by bending processing, furthermore it is possible to leave behind this fillet inside thereof, thus enabling to omit the process to dissolve and remove this filler by solvent, heating or the like after processed said pipe material to aiming shape. Yet, by using the substance with specific gravity lower than that of pipe material as a filler, in the necklace having a construction as shown in Fig. 10, the neighborhood of fastening metal fittings becomes relatively light and the lower portion becomes heavier than the upper portion on wearing, thus making it also possible to solve the problem that the necklace ends up to turn around neck during wearing. In this example, an example of Kihei chain was shown, but any other type of chain may be used for necklace, and chains used pieces wherein the inside of pieces neighboring connecting metal fittings is hollow, pieces wherein the specific gravity of the material of said pieces is lower than that of the material of pieces in the middle portion of chain, and the like can be used. And, when using ring-like pieces as in the example aforementioned, those filled inside with light weight material are good to prevent the collapse of section on molding processing. Moreover, the sectional shape of such ring-like pieces may be any shape of ellipse, rectangle and the like in addition to circle as in Fig. 11. Example 3 When making the necklace comprising Kihei chain as in Fig. 3, using similarly shaped ring-like pieces, all of which consist of gold pipe material, aluminum was filled in the pieces neighboring both sides of connecting metal fittings and lead was filled in the pieces in the middle portion. With such necklace, too, the neighborhood by connecting metal fittings is relatively of lighter weight than middle portion, hence said necklace never ends up to turn around neck on wearing. Example 4 In the necklace to be made by successively arranging a lot of plated spherical pieces, thicker plating is given for the pieces to be arranged in the middle portion than for the pieces neighboring connecting metal fittings. With such construction, the middle portion becomes relatively heavier than the sides of connecting metal fittings, hence it is possible to prevent the rotation of said necklace around neck during wearing. Possibility of utilization in the industry As described, according to the invention, the nice-looking of necklace and good wearing property thereof can be obtained, since the inconvenience that the necklace turns around neck can be solved and the portion of connecting metal fittings is always on the rear side. In addition, when using ring-like pieces consisting of hollow pipe material as pieces, they can be utilized in the state of leaving behind the filler, which had been used at the time of molding processing, in said pieces as it is, hence the process to remove said filler can be omitted, leading to decreased manufacturing cost. Moreover, if using the pieces consisting of such pipe material or pieces consisting of hollow material, the amount of material to be used can be saved, resulting in significant effect particularly in the case of using noble metal materials.

Claims: A rotation-preventive necklace, in which a plurality of pieces (2,4) are successively arranged and provided with connecting metal fittings (1) at both ends, characterized in that at least one or more of pieces (2) neighboring the connecting metal fittings are formed with hollow members and other pieces (4) are formed with members which are heavier than the members forming the at least one or more of pieces (2) neighboring the connecting metal fittings (1). The rotation-preventive necklace of claim 1, wherein the other pieces (4) are formed with solid members. The rotation-preventive necklace of claim 1 or 2, wherein all pieces (2,4) are formed with the same material and in the same shape. The rotation-preventive necklace of claim 1 or 2, wherein a necklace with pieces having different shapes of plural types arranged repeatedly in turn, respectively, is used. The rotation-preventive necklace of any of claims 1 through 4, wherein the pieces (4) locating in the middle portion of necklace being less than approximately 1/3 of the overall length of necklace are made solid members and the respective pieces locating in the portion of both ends of necklace being less than approximately 1/3 of the overall length of necklace are made hollow members (2). The rotation-preventive necklace of any of claims 1 through 5, wherein the prime material of pieces (2,4) is metal. The rotation-preventive necklace of claim 1 or 2, characterized in that the pieces are similarly shaped ring-like pieces (6,6') joined to each other, the pieces (6') neighboring the connecting metal fittings (8, 8', 9, 10) are formed with pipe material and the pieces (6) in the middle portion are formed with solid material with the quality of material being same as that of the pipe material. The rotation-preventive necklace of claim 7, wherein a substance lighter than the pipe material is filled in the pipe material. The rotation-preventive necklace of claim 8, wherein the substance lighter than pipe material is a light metal such as aluminum, wax or resin. The rotation-preventive necklace of claim 1, characterized in that the pieces are similarly shaped ring-like pieces (6) joined to each other, the pieces (6) neighboring the connecting metal fittings (8, 8', 9, 10) are formed with pipe material with light weight filler filled inside and the pieces in the middle portion are formed with pipe material with weight filler heavier than the light weight filler filled inside. The rotation-preventive necklace of claim 10, wherein heavy metal such as lead or copper is used as a weight filler in the case of light weight filler being light metal such as aluminum, wax or resin. The rotation-preventive necklace of claim 1, characterized in that the pieces are similarly shaped hollow pieces, wherein the pieces in the middle portion are plated more thickly than pieces neighboring connecting metal fittings.

Inventors: NAKAGAWA SHIGEKI, NAKAGAWA, SHIGEKI
Applicants: NAKAGAWA CORP, NAKAGAWA CORPORATION
Application year: 1998
Main classification: A44C25
IPC codes: A44C15, A44C11