EP0793294B1 - Method for producing electrical contacts that can be applied in particular to the web of rails and the like - Google Patents

Method for producing electrical contacts that can be applied in particular to the web of rails and the like Download PDF

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Publication number
EP0793294B1
EP0793294B1 EP96117620A EP96117620A EP0793294B1 EP 0793294 B1 EP0793294 B1 EP 0793294B1 EP 96117620 A EP96117620 A EP 96117620A EP 96117620 A EP96117620 A EP 96117620A EP 0793294 B1 EP0793294 B1 EP 0793294B1
Authority
EP
European Patent Office
Prior art keywords
die
electrical contact
produced
web
rails
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.)
Expired - Lifetime
Application number
EP96117620A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0793294A2 (en
EP0793294A3 (en
Inventor
Ennio Peroni
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.)
Cembre SpA
Original Assignee
Cembre SpA
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 Cembre SpA filed Critical Cembre SpA
Publication of EP0793294A2 publication Critical patent/EP0793294A2/en
Publication of EP0793294A3 publication Critical patent/EP0793294A3/en
Application granted granted Critical
Publication of EP0793294B1 publication Critical patent/EP0793294B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/06—Riveted connections

Definitions

  • the present invention relates to a method for producing electrical contacts that can be applied in particular to the web of rails and the like.
  • Electrical contacts are conventionally used, especially in the railroad field, that can be applied to the web of rails and the like and are substantially constituted by a body that forms an internally hollow stem, which is connected, at one end, to an enlarged flange.
  • the stem can be inserted in a hole formed in the web of a rail and is fixed by means of a mechanical deformation performed by extrusion.
  • These contacts are usually produced by using either a perforated bar or a solid rod the outside diameter whereof is equal to, or slightly larger than, the size of the flange of the electrical contact, subsequently subjecting the material to chip-formation machining to achieve the desired shape.
  • cracks can be triggered by the machining marks, rough areas or the like, that are inevitably present on the contact surface due to chip-formation machining.
  • a principal aim of the invention is to eliminate the drawbacks described above by providing a method for producing an electrical contact that allows to drastically simplify all operating steps, thus obtaining a product that is not subject to cracks or the like.
  • a particular object of the invention is to provide an electrical contact that is particularly adapted for carrying coded currents and the return of the electric traction current on lines equipped with an automatic locking system; it is also possible to use the contact in a supply, receiving, and "Z" connection in track circuits using a single stretch of rail, in return connections for the electric traction current, as reentry to a sub-station, in electric traction connections on cast-manganese steel frogs of switches, in connections between a metallic structure and the return rails with electric traction, and in electrical drainages from metallic and buried structures towards tracks and the like.
  • Another object of the present invention is to provide an electrical contact that is capable of giving the greatest assurances of reliability and safety in use by means of its particular constructive characteristics.
  • Another object of the present invention is to provide a method for producing electrical contacts that can be applied particularly to the web of rails and the like and can be easily obtained with simple and inexpensive machining operations.
  • the method for producing electrical contacts that can be applied in particular to the web of rails and the like consists in providing a copper pipe stub 1 having gauged dimensions and which is free of any kind of impurity.
  • the stub 1, cut into pieces of appropriate length, is converted into the finished product by means of a cold deformation, in a die on an automatic press, without resorting to chip-formation machining.
  • a die 10 which forms an axial channel 11 that ends with an enlarged portion 12 in an upward region.
  • a secondary die part 13 is arranged in the channel 11 and acts as a resting element for the axial end of the stub 1.
  • a punch 20 is inserted by means of an automatic press; said punch has a stem 21 that is connected to a shoulder 23 by means of a frustum-shaped wider portion 22.
  • the stem 21 in practice enters the tubular stub 1 and the frustum-shaped wider portion 22 forms a flared part at the flange region that is delimited between the wider portion 12 and the shoulder 23.
  • the secondary die part 13 is actuated so as to extract the contact 30.
  • the contact 30 Since the contact 30 is produced by cold-deformation, it always has a very high dimensional and quality standard, with a constantly uniform finish degree that is beyond compare with what can be obtained by chip-formation machines.
  • the materials employed may be any according to the requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Electric Clocks (AREA)
  • Forging (AREA)
EP96117620A 1996-02-27 1996-11-04 Method for producing electrical contacts that can be applied in particular to the web of rails and the like Expired - Lifetime EP0793294B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI960369 1996-02-27
IT96MI000369A IT1282701B1 (it) 1996-02-27 1996-02-27 Procedimento per la realizzazione di contatti elettrici applicabili particolarmente sull'anima di rotaie e simili

Publications (3)

Publication Number Publication Date
EP0793294A2 EP0793294A2 (en) 1997-09-03
EP0793294A3 EP0793294A3 (en) 1998-07-22
EP0793294B1 true EP0793294B1 (en) 2002-08-21

Family

ID=11373414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117620A Expired - Lifetime EP0793294B1 (en) 1996-02-27 1996-11-04 Method for producing electrical contacts that can be applied in particular to the web of rails and the like

Country Status (5)

Country Link
EP (1) EP0793294B1 (enrdf_load_stackoverflow)
AT (1) ATE222665T1 (enrdf_load_stackoverflow)
DE (1) DE69623108T2 (enrdf_load_stackoverflow)
ES (1) ES2180681T3 (enrdf_load_stackoverflow)
IT (1) IT1282701B1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120406A1 (it) 2012-03-15 2013-09-16 Cembre Spa Contatto elettrico permanente applicabile sull'anima di rotaie e simili

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3540255A (en) * 1967-12-13 1970-11-17 Lamson & Sessions Co Method and apparatus for making hollow metal articles
DE2838157A1 (de) * 1978-09-01 1980-03-13 Eberhardt Peka Fahrzeug Verfahren und vorrichtung zum anformen eines endbundes an ein rohrstueck
IT1215911B (it) * 1988-02-18 1990-02-22 Cembre Srl Contatto elettrico permanente applicabile sull'anima di rotaie esimili.
FR2644714A1 (fr) * 1989-03-22 1990-09-28 Commissariat Energie Atomique Procede d'obtention de pieces de grandes dimensions en cuivre et de structure tres fine, a partir d'un lopin issu de coulee continue

Also Published As

Publication number Publication date
DE69623108T2 (de) 2002-12-12
DE69623108D1 (de) 2002-09-26
ES2180681T3 (es) 2003-02-16
IT1282701B1 (it) 1998-03-31
ITMI960369A1 (it) 1997-08-27
EP0793294A2 (en) 1997-09-03
EP0793294A3 (en) 1998-07-22
ITMI960369A0 (enrdf_load_stackoverflow) 1996-02-27
ATE222665T1 (de) 2002-09-15

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