EP1016356A1 - Element ornemental et sa méthode de production - Google Patents

Element ornemental et sa méthode de production Download PDF

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Publication number
EP1016356A1
EP1016356A1 EP99830787A EP99830787A EP1016356A1 EP 1016356 A1 EP1016356 A1 EP 1016356A1 EP 99830787 A EP99830787 A EP 99830787A EP 99830787 A EP99830787 A EP 99830787A EP 1016356 A1 EP1016356 A1 EP 1016356A1
Authority
EP
European Patent Office
Prior art keywords
coils
mandrel
wire
workpiece
precious metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99830787A
Other languages
German (de)
English (en)
Inventor
Marco Alvelli
Massimiliano Arostini
Paolo Bruni
David Olianti
Leo Sandroni
Rodolfo Vitali
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Target SRL
Original Assignee
Target SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Target SRL filed Critical Target SRL
Publication of EP1016356A1 publication Critical patent/EP1016356A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C27/00—Making jewellery or other personal adornments
    • A44C27/001—Materials for manufacturing jewellery
    • A44C27/002—Metallic materials
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C15/00—Other forms of jewellery
    • A44C15/0045—Jewellery specially adapted to be worn on a specific part of the body not fully provided for in groups A44C1/00 - A44C9/00
    • A44C15/005—Necklaces
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C5/00—Bracelets; Wrist-watch straps; Fastenings for bracelets or wrist-watch straps
    • A44C5/0053—Flexible straps
    • A44C5/0061—Flexible straps essentially made from metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of rods or wire
    • B21C37/045—Manufacture of wire or rods with particular section or properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles

Definitions

  • the present invention relates to the field of jewellery and costume jewellery and in particular relates to a tubular ornamental element for use in the above field.
  • the invention also relates to a method for producing the tubular ornamental element as well as the jewellery and costume jewellery articles, typically necklaces and earrings, which can be made from the above mentioned ornamental element.
  • An ornamental chain of the known type in the above mentioned field comprises a tubular structure, known as "gas-tube” according to a term familiar to any person skilled in the art.
  • This chain is used in particular for the production of necklaces and bracelets and is formed by the connection of two helicoidal strip-shaped members with longitudinal edges bent in opposite sides.
  • the coils of the helicoidal members are coaxially alternated in a continuous sequence, each of the two longitudinal bent edges of a coil of one member engaging with one of the opposedly bent edges of a pair of adjacent coils of the other one. Therefore, the structure of the "gas-tube” chain exhibit a nearly negligible axial and transverse play.
  • the structure of the tubular ornamental element according to the present invention is characterized in that a precious or non-precious hollow wire with a substantially quadrilateral section, which is helicoidally bent according to adjacent coils about a longitudinal axis, the ends of the wire being connected by a substantially filiform tie rod extending along the longitudinal axis within the wire coils.
  • a necklace is formed by a ornamental element according to the invention generally indicated at 1, with a closure 2 schematically shown in figure 1, connected at the ends la thereof in a conventional way and fit for engaging chain ends la with one another.
  • Element 1 is formed by a hollow wire 3 of a substantially C-shaped quadrilateral cross section, of the known type, typically of precious metal, such as gold.
  • Wire 3 is bent in the shape of a helic with side-by-side adjacent coils, of substantially circular cross section in the embodiment shown in figure 2, according to a substantially tubular arrangement.
  • each coil 4 is shown as having a box-like section with a circumferential cut 4a on its inner side resulting form the wire production process, as will be described here below.
  • the diameter of coils 4 is constant for a given length from ends la and symmetrically and continuously increases at an intermediate portion 1b of element 1 and, in such a way that the overall shape of element 1 and, consequently, of the necklace formed therewith is of the variable link size type.
  • a substantial filiform tie rod 5 extends between ends la of element 1 inside coils 4, in a substantially axial direction with respect to the tubular development of element 1. More precisely, tie rod 5 connects the ends of hollow wire 3 threbetween, to ensure the axial alignment of coils 4, due to the traction force exerted by it , and consequently, to ensure the compactness of element 1, without hindering the mutual movement between adjacent coils.
  • Tie rod 5, schematically shown in figure 2 may be constituted by a thin chain made of gold or other precious, metallic material, or, particularly for less valuable products, by a wire made of non-precious metal or other material such as nylon.
  • the ornamental element 1 is made through a specific production process.
  • a bimetallic wire must be prepared.
  • the wire is formed by a non-precious metal core, such as copper, iron or an alloy fit for being solubilized by chemical attack with a suitable solvent, and an external layer of precious metal such as gold.
  • the wire may be produced by known techniques such as plating or seaming.
  • a bimetallic workpiece of quadrilateral section, in particular rectangular section has been used.
  • Mandrel 6 is especially made in metallic or plastic material, for instance by known moulding or turning processes.
  • the mandrel material is iron or an alloy thereof which, according to what will be described herebelow, also the above mentioned core can be made of.
  • mandrel 6 comprises an enlarged central portion 6a for generating coils 4 of larger diameter and therefore the above mentioned variable size shape of element 1.
  • Mandrel 6 also comprises end blocks 7 having respective through holes 8, within which the ends of the bimetallic wire are engaged as wounding is completed.
  • the two or three coils forming the end portions of the workpiece are soldered together.
  • the method further comprises a step of radial hammering of the workpiece with press or vibrating hammer means of known type to stabilize the helicoidal shape of coils 4 and eliminate, as far as possible, any discontinuity, in the form of small steps or gaps unavoidably formed between adjacent coils during wounding operation, with the aim of obtaining an essentially uniform and smooth external surface.
  • coils 4 After emptying, even if lacking of the support provided by mandrel 6, coils 4 maintain an helical configuration due to their compression. On the other hand they are substantially free to mutually slide in the radial direction and, therefore, need a suitable locking capable of forming a stable tubular configuration of element 1.
  • tie rod 5 To this end tie rod 5 is inserted axially within coils 4 and is connected to the ends of hollow wire 3.
  • element 1 can have also a tubular development of a substantially constant diameter.
  • coils 4 can have an elliptical or generally curved development, formed by means of a mandrel 6 with a correspondingly profiled cross section.
  • Tie rod 5 can be formed by two or more chains or wires optionally intertwined to each other.
  • the ornamental element according to the invention is particularly suited for the production of necklaces and earrings, but it can be used for the production of other jewellery goods as well, such as bracelets and pendants. Even if the ornamental effect of the element of the invention is somewhat similar to that of a "gas-tube" chain, it is made of only one piece with important advantages as far as the functionality and the aesthetic value of the product as well as the productivity of the process are concerned, the process being also relatively easy and inexpensive to carry out.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Adornments (AREA)
EP99830787A 1998-12-29 1999-12-21 Element ornemental et sa méthode de production Withdrawn EP1016356A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998FI000282A IT1305067B1 (it) 1998-12-29 1998-12-29 Elemento ornamentale a sviluppo tubolare di impiego nel settore orafoe della bigiotteria, in particolare per la realizzazione di collane ed
ITFI980282 1998-12-29

Publications (1)

Publication Number Publication Date
EP1016356A1 true EP1016356A1 (fr) 2000-07-05

Family

ID=11352740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99830787A Withdrawn EP1016356A1 (fr) 1998-12-29 1999-12-21 Element ornemental et sa méthode de production

Country Status (2)

Country Link
EP (1) EP1016356A1 (fr)
IT (1) IT1305067B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003022091A1 (fr) * 2001-09-11 2003-03-20 Rancangelo De Rancan Dario E Pietro S.N.C. Procede relatif a l'elaboration d'elements metalliques allonges
EP1245168A3 (fr) * 2001-03-26 2003-12-10 Roana Antonio E Figli S.N.C. Un produit manufacturé d'ornement de type "dégradé"

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2099285A (en) * 1981-05-28 1982-12-08 Vieri Spa Method for making necklaces, bracelets and the like by chains wound upon a supporting core
GB2161695A (en) * 1984-07-21 1986-01-22 Shikiseimitsu Kabushikikaisha Metal wristwatch strap
EP0214363A1 (fr) * 1985-07-30 1987-03-18 Gebr. Niessing GmbH & Co. Objet d'ornement
EP0441138A1 (fr) * 1990-02-08 1991-08-14 Georg Bunz Chaîne ornementale
EP0638256A1 (fr) * 1993-08-11 1995-02-15 Comptoir Lyon-Alemand - Louyot Procédé pour la fabrication d'un fil composite destiné à la réalisation de bijoux creux

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2099285A (en) * 1981-05-28 1982-12-08 Vieri Spa Method for making necklaces, bracelets and the like by chains wound upon a supporting core
GB2161695A (en) * 1984-07-21 1986-01-22 Shikiseimitsu Kabushikikaisha Metal wristwatch strap
EP0214363A1 (fr) * 1985-07-30 1987-03-18 Gebr. Niessing GmbH & Co. Objet d'ornement
EP0441138A1 (fr) * 1990-02-08 1991-08-14 Georg Bunz Chaîne ornementale
EP0638256A1 (fr) * 1993-08-11 1995-02-15 Comptoir Lyon-Alemand - Louyot Procédé pour la fabrication d'un fil composite destiné à la réalisation de bijoux creux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1245168A3 (fr) * 2001-03-26 2003-12-10 Roana Antonio E Figli S.N.C. Un produit manufacturé d'ornement de type "dégradé"
WO2003022091A1 (fr) * 2001-09-11 2003-03-20 Rancangelo De Rancan Dario E Pietro S.N.C. Procede relatif a l'elaboration d'elements metalliques allonges

Also Published As

Publication number Publication date
ITFI980282A1 (it) 2000-06-29
IT1305067B1 (it) 2001-04-10
ITFI980282A0 (it) 1998-12-29

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