EP1445833A2 - Dispositif et procédé pour connecter électriquement des sections de rail - Google Patents

Dispositif et procédé pour connecter électriquement des sections de rail Download PDF

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Publication number
EP1445833A2
EP1445833A2 EP04002058A EP04002058A EP1445833A2 EP 1445833 A2 EP1445833 A2 EP 1445833A2 EP 04002058 A EP04002058 A EP 04002058A EP 04002058 A EP04002058 A EP 04002058A EP 1445833 A2 EP1445833 A2 EP 1445833A2
Authority
EP
European Patent Office
Prior art keywords
fish
rails
plate
conductive element
tightening
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Withdrawn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
EP04002058A
Other languages
German (de)
English (en)
Other versions
EP1445833A3 (fr
Inventor
Callisto Strata
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1445833A2 publication Critical patent/EP1445833A2/fr
Publication of EP1445833A3 publication Critical patent/EP1445833A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • H01R4/58—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 characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail

Definitions

  • the invention relates to an apparatus and a process for joining together consecutive rails or rail sections, being in particular part of the tracks of a railway line, under conditions of electrical continuity, as defined in the preamble of claim 1.
  • tracks for railway lines ⁇ as well as for tramlines, carriages, bridge cranes, etc. ⁇ consist of aligned rails, or parts thereof (rail sections) connected with each other along two parallel lines.
  • Union between the ends of two consecutive rails and/or rail sections can be obtained in two ways: by welding with the aluminothermic method or the electric flash method, or by application of appropriate fish-plates, tightened by screw elements known as "fishbolts".
  • Union between two consecutive rails, in particular on railway lines, does not only require a mechanical continuity, but an efficient electrical continuity is to be obtained as well between the same.
  • the fish-plates only have the task of making junctions of the mechanical type and usually are bad electricity conductors and sometimes they are even electrically insulated.
  • the solution that is generally adopted to obtain a satisfactory electrical continuity is that of connecting the immediately consecutive ends of the rails or rail sections by means of copper cables or plaits of appropriate section.
  • the two ends of the copper plaits are fastened to the two rails upstream and downstream of each fish-plate through several different devices.
  • the ends of the copper plaits are inserted into hollow copper cylinders, in turn inserted in appropriate holes formed in the rails close to the region in engagement with the fish-plate; or the plait ends are directly locked by forced fitting in said holes through wedge-shaped pins (named "olive”).
  • the plait ends are fastened to terminals that are anchored and tightened to the rail flange.
  • said combination involves use of many elements that must be manufactured, made available and individually applied, this being time-consuming and requiring use of many resources and a lot of manpower.
  • said means for ensuring the electrical continuity which are made of a great number of elements are also unsatisfactory in terms of sturdiness, duration and assembling and servicing times.
  • the technical task underlying the present invention is to devise an apparatus and a process capable of substantially obviating the mentioned drawbacks.
  • the apparatus in accordance with the invention is generally identified by reference numeral 1 .
  • the fishbolts are screw elements comprising a threaded bar 3a and a nut 3b .
  • Fig. 1 Shown in Fig. 1 is the simplest embodiment, with a single fish-plate 2, whereas in Fig. 2 a standard embodiment is shown which consists of two fish-plates 2 tightening the ends of two rails 4 on opposite sides through fishbolts 3.
  • Fig. 1 Shown in Fig. 1 are four fishbolts passing through holes 5a and 5b formed through the fish-plates 2 and rails 4, respectively.
  • the illustrated rails 4 are of the type used in railway lines. Each of them, seen in section, has a widened upper portion called head 6 , on which the vehicle wheels rest, an intermediate thin portion that is particularly extended in height, called web, 7 and a widened lower portion called flange 8 .
  • the web 7 has two side faces 7a of a substantially vertical extension forming, as a whole, the surface portion of rails 4 substantially having the greatest width.
  • the head 6 and flange 8 have surface sections mutually converging towards the web side faces 7a to which they are contiguous.
  • the fish-plates 2 are provided to be wedge-like fitted between the convergence sections 6a, 8a, thereby establishing a direct and forced contact therewith, while keeping a position spaced apart from web 7.
  • the immediately consecutive rails 4 are usually in side by side relationship, while maintaining a small space, called laying clearance, allowing thermal expansion in a longitudinal direction; for electrically connecting the consecutive rails 4 with each other, in spite of said space, provision is made for electrical connection elements placed close to the fish-plates 2.
  • These electrical connection elements comprise at least one conductive element 11 or two conductive elements 11, each of which is disposed in a space 9 and is in engagement with rails 4, in contact relationship therewith through mechanical tightening of the fish-plates 2.
  • each conductive element 11 consists of a thin plate made of copper for example or another conductive material, such sized and positioned that it engages at least one major portion of a side face 7a of web 7 by contact. Then tabs 11a of the same material as the thin plate are disposed at the sides of the thin plate 11 itself and they project and are bent to a T-shaped configuration so as to embrace a fish-plate 2 on opposite sides.
  • At least one pressure body 12 is interposed between one conductive element 11 and the relevant fish-plate 1 .
  • the pressure body 12 has a first work surface 12a the shape of which matches that of the thin plate 11 and a second work surface 12b the shape of which matches that of the fish-plate 2.
  • the pressure body 12 is preferably elastically deformable and is made of plastic material or an appropriate elastomer material.
  • Both the thin plate 11 and pressure body 12 are provided with holes adapted to be brought into alignment with said holes 5a and 5b formed in the fish-plate 2 and rails 4 respectively, to enable passage of fishbolts 3.
  • a conductive compound also having an antioxidant effect can be interposed between the conductive element 11 and rails 4.
  • the fish-plates 2 and conductive elements 11 can be mounted on rails 4 by aligning said holes and inserting the fishbolts 3 thereinto.
  • the pressure bodies 12 too can be inserted together with the conductive elements 11 after arrangement of the respective holes to a position in alignment with the holes in rails 4.
  • Said fishbolts 3 are screwed down by dynamometric wrenches so as to obtain the most appropriate tightening action from the point of view of the mechanical engagement of the fishbolts 2 on the convergence sections 6a, 8a of consecutive rails 4.
  • the conductive elements 11 adhere under pressure to the side faces 7a of webs 7, so as to ensure an excellent electrical continuity.
  • the pressure bodies 12 exist and are made of elastically deformable material, locking under pressure of the conductive elements 11 does not interfere with the mechanical locking of the consecutive rails 4 and does not condition it.
  • the invention teaches a new process for giving electrical continuity to consecutive rails, or parts thereof (rail sections) being part of a railway line in which said rails are joined together by fish-plates.
  • This process involves the steps of inserting at least one conductive element between the rails and fish-plates during the assembling step and pressing said conductive element by means of the same tightening action carried out on the fish-plates.
  • the mechanical rail tightening be at least partly independent, in terms of intensity, of the pressure exerted on the conductive element.
  • the invention allows important advantages to be achieved.
  • the devised technical solution is also simple, of quick and easy application and reduced costs.
  • assembling can be also carried out by unskilled staff provided with the only instruments currently used for tightening of the fishbolts.
  • squashing of the conductive element does not hinder the mechanical tightening of the fish-plates.
  • the intervention time when two rails or parts thereof are required to be connected is surely more reduced than with the prior art systems.
  • the devised technical solution is also advantageous under other important aspects such as safety of the whole railway line: in fact in case of strong untightening or breakage ⁇ due to accidental reasons ⁇ of the fish-plates joining the rails, and therefore in case of risk of separation of the rails themselves, also a reduction or breaking of the electric signal occurs due to a concurrent detachment of the conductive elements.
  • the invention is susceptible of modifications and variations.
  • the conductive elements can be differently shaped and sized and can also appear like a network, a grid or a plurality of copper plaits.
  • the pressure bodies too can be differently structured and also combined in a substantially stable manner with the conductive elements.
  • the conductive elements may consist of a plurality of elements in engagement by restrained fixing with the pressure bodies and projecting therefrom.

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
EP04002058A 2003-02-04 2004-01-30 Dispositif et procédé pour connecter électriquement des sections de rail Withdrawn EP1445833A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20030174 ITMI20030174A1 (it) 2003-02-04 2003-02-04 Apparato e procedimento per unire con condizioni di continuita' elettrica rotaie consecutive o spezzoni di esse
ITMI20030174 2003-02-04

Publications (2)

Publication Number Publication Date
EP1445833A2 true EP1445833A2 (fr) 2004-08-11
EP1445833A3 EP1445833A3 (fr) 2005-12-28

Family

ID=32652457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04002058A Withdrawn EP1445833A3 (fr) 2003-02-04 2004-01-30 Dispositif et procédé pour connecter électriquement des sections de rail

Country Status (2)

Country Link
EP (1) EP1445833A3 (fr)
IT (1) ITMI20030174A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5929521A (ja) * 1982-08-07 1984-02-16 Nippon Densetsu Kogyo Kk 複合剛体電車線

Also Published As

Publication number Publication date
EP1445833A3 (fr) 2005-12-28
ITMI20030174A1 (it) 2004-08-05

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