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WO1997036055A1 - Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes - Google Patents

Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes Download PDF

Info

Publication number
WO1997036055A1
WO1997036055A1 PCT/GB1996/000739 GB9600739W WO9736055A1 WO 1997036055 A1 WO1997036055 A1 WO 1997036055A1 GB 9600739 W GB9600739 W GB 9600739W WO 9736055 A1 WO9736055 A1 WO 9736055A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulator
rail
clip
assembly
bearing portion
Prior art date
Application number
PCT/GB1996/000739
Other languages
English (en)
Inventor
Timothy Alan Wood
Kevin Stubbs
Stephen John Cox
Martin David Somerset
Brian George Conroy
Original Assignee
Pandrol Limited
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 Pandrol Limited filed Critical Pandrol Limited
Priority to EP96909213A priority Critical patent/EP0828891B1/fr
Priority to PCT/GB1996/000739 priority patent/WO1997036055A1/fr
Publication of WO1997036055A1 publication Critical patent/WO1997036055A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00—Fastening rails on sleepers, or the like
    • E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
    • E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
    • E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
    • E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar

Definitions

  • the present invention relates to railway rail fastening assemblies including resilient railway rail fastening clips and associated insulators.
  • the present applicant proposed a new form of insulator in which the toe and post portions are separate, the clip carrying the toe portion of the insulator and the post portion of the insulator being held in place by the anchoring device.
  • an insulator system is provided in which it is possible to fit the post insulator to a clip anchoring device before the rail is laid, thereby facilitating track installation by simplifying the job of fitting insulators and reducing the number of loose components delivered to the site of installation.
  • the use of separate toe and post insulators allows the post insulator to be replaced separately from the toe insulator, and vice versa.
  • Prior art "captive" toe insulators such as that disclosed in W093/12295 which clip onto a bend in the rail fastening clip and that disclosed in GB-A-2106571 which is glued onto the clip, are firmly secured to the clip and present a fixed bearing surface to the rail foot.
  • the position of the contact point between the toe insulator and the rail flange, and the size of the bearing area vary such that in these conditions certain parts of the toe insulator are subjected to undesirably high pressure, thereby accelerating wear of the toe insulator.
  • an assembly for use in fastening a railway rail to an underlying rail foundation which assembly comprises a resilient railway rail fastening clip, having at least one portion of substantially circular cross-section which when in use bears on, and extends substantially parallel to, a flange of an adjacent railway rail, and an insulator for electrically insulating the clip from the rail which is retained on the rail bearing portion of the clip when in use, wherein the insulator is held in engagement with the clip such that the insulator is mounted for rotational displacement about the • longitudinal axis of the said rail bearing portion, whereby the insulator is self-aligning on the rail flange.
  • an insulator embodying the present invention is held in engagement with the clip such that it is free to rotate, at least partly, about the longitudinal axis of the rail bearing portion of the clip. It should be noted that in the present specification rotational displacement is intended to mean a movement about the longitudinal axis of the rail bearing portion of the clip which is not necessaryily through 360°, and may indeed be very much smaller.
  • the self-alignment of the assembly is such that whatever the geometry of the rail fastening arrangement there is always a normal contact between the insulator and the rail flange.
  • a clip and insulator assembly embodying the present invention is self-conforming to the actual contact geometry between the rail bearing portion of the clip and the rail flange.
  • This self-aligning capability of the insulator on the clip enables the same clip and insulator assembly to be employed in a wide range of fastening installations, even where the design of various other components of the installation (such as the design of the rail flange) vary.
  • an assembly embodying the second aspect of the present invention has the further advantages of being able to accommodate such dynamic movement of the rail under load without frictional abrasion at the bearing contact point, thus extending toe insulator life, and being able to protect the clip from high lateral strains, since the rotation of the insulator prevents loads from being induced in the clip.
  • a simple change to existing types of clip can result in significant improvements to a variety of widely-used rail fastening assemblies.
  • Either the insulator, the rail bearing portion of the clip or both are provided with means, permitting rotational displacement of the insulator, for limiting longitudinal displacement of the insulator on the rail bearing portion during driving of the clip onto the rail flange.
  • the rail bearing portion of the rail fastening clip may include an axially-local change or displacement in transverse cross-section which is adapted to engage with a corresponding change in internal cross-section of a toe insulator for attachment to the rail bearing portion to limit displacement of the insulator on the rail bearing portion so as to counter any tendency during installation, and/or in use, for the insulator to move too far along the rail bearing portion.
  • the change or displacement in transverse section preferably, but not exclusively, comprises: one or more recesses or circumferential grooves for engaging with corresponding projections on the insulator; an offset, which may or may not involve any change in the transverse section, one or more tabs, or circumferential protrusions for engaging with corresponding recesses or grooves on the internal surface of the insulator; a threaded portion for engaging with a corresponding thread on the insulator; one or more tabs acting as stops at one or both ends of the rail bearing portion of the clip; a local narrowing of axial cross-section which is such that the insulator can move freely about the narrowed part, but cannot move beyond it as the unnarrowed diameter of the clip is greater than the passageway or recess of the insulator; or other reduction or increase in width or diameter of the rail bearing portion, as appropriate.
  • the insulator has two or more load bearing surfaces, and the insulator may be rotationally displaced so as to change which of the load bearing surfaces of the insulator is presented to the rail flange.
  • the insulator may be rotated about the rail bearing portion so as to present an unworn load bearing surface to the rail flange.
  • an insulator embodying the present invention can be rotated so as to adjust the height of the rail bearing portion above the rail flange.
  • the height of a rail, sitting on an elastomeric pad, with respect to an adjacent anchoring device will gradually decrease as the pad wears. This causes a reduction of the toe load exerted on the rail by the clip.
  • an insulator with an offset recess or passageway can be rotated such that the deflection of the clip is increased, hence increasing the toe load exerted by the clip.
  • the insulator may be employed to adjust the toe load applied by the clip without the need to change the insulator or the clip itself. Furthermore, such a clip and insulator assembly may reduce the cost, and facilitate construction, of new track, since the height of the shoulders need be set only approximately and the insulator rotated so as to adjust the installation to the correct height.
  • the exterior of an insulator embodying the present invention may be of any shape.
  • embodiments of the insulator may have one, two, three, four, five, six or more load bearing surfaces.
  • the insulator has a polygonal, or part- polygonal, cross-section.
  • There may be a radius on the or each load bearing surface which may vary and may be such as to aid self-alignment of the insulator.
  • the or each load bearing surface may be shaped such that the cross-section of the insulator is circular or elliptical, or part-circular or part- elliptical.
  • One or more of the load bearing surfaces themselves may be part-cylindrical (circular or elliptical) .
  • Each load bearing surface of an insulator embodying the present invention is preferably, but not essentially, of substantially equal size.
  • An insulator embodying the present invention may be formed with a longitudinal recess shaped so as to clip onto the rail bearing portion of the clip, or with a passageway therein to receive the rail bearing portion of the clip.
  • This recess or passageway may have a blank or open end.
  • the passageway or longitudinal recess is located such that the insulator and the rail bearing portion of the clip are co-axial, but in an insulator embodying the present invention the passageway or recess need not be centrally located in the insulator, so it may be employed for height adjustment, as described above.
  • An assembly embodying the present invention can employ any one of a number of different types of rail fastening clip, providing the rail bearing portion of the clip extends substantially parallel to the line of the rail, has a substantially circular cross-section and can be appropriately adapted so as to limit longitudinal displacement of the insulator therealong.
  • clips which may be advantageously employed include those described in: GB-1,510,224 (known as “e”-clips) , GB-861,473 (known as "PR" clips) ,
  • GB-A-2,211,229 (known as “Sonata” clips) , 093/12296 ("M”-clips), EP-A-0401424 (“SKL” clips) or US-4, 304, 359 (“Z”-clips) .
  • the "e”-clip, “Sonata”-clip and “Z”-clip have a rail bearing portion which is at one of the free ends of the clip.
  • the "SKL” clip has two free ends which bear on the rail.
  • the "M”-clip has a portion between the two inner legs of the "M” which bears on the rail.
  • the rail bearing portion of a "PR” clip is a bent part of the clip located between two arches thereof.
  • Figures 1 and 2 show respective plan views of e-shaped and Z-shaped clips
  • Figure 3 shows in transverse section a rail fastening assembly including an e-shaped clip of Figure
  • Figures 4a and 4b show respective transverse sectional and plan views of a rail fastening assembly including an M-shaped clip;
  • Figure 5 shows in transverse section a rail fastening assembly including a clip and insulator arrangement embodying the present invention
  • Figures 6a and 6b show respective perspective and end-on views of an insulator for use in an assembly embodying the present invention
  • Figures 7a and 7b show respective perspective and end-on views of another insulator for use in an assembly embodying the present invention
  • Figures 8a, 8b, 8c and 8d show respective end-on views of further insulators for use in an assembly embodying the present invention
  • Figure 9 shows an end-on view of another insulator for use in an assembly embodying the present invention.
  • Figures 10a, 10b, 10c and lOd show respective perspective views of the toe portions of clips for use in an assembly embodying the present invention.
  • Figures 1 and 2 show, respectively, an e-shaped and a Z-shaped clip.
  • Figure 3 shows a rail fastening assembly including the e-shaped clip of Figure 1, but the Z-shaped clip of Figure 2 may alternatively be used therewith.
  • the clips of Figures 1 and 2 and the arrangement of Figure 3 are representative of the clips and arrangements as published under GB 1,510,224 and US 4,304,359.
  • the clips of Figures 1 and 2 each comprise a free end portion 1, a crossover arm 2 and a central leg 3.
  • the crossover arm 2 has a heel part 2a which, in use, bears on part of an anchoring device or shoulder 200 secured to a rail foundation 100 adjacent to a rail 300 to be fastened.
  • the free end portion 1 has a rail bearing portion or toe la which bears on a flange 301 of the rail 300.
  • the central leg 3 is received in a housing 201 in the shoulder 200 and the toe portion la bears on a one-part insulating member 50 on the upper surface of the rail flange 301.
  • the insulating member 50 has a toe portion 50a which is seated on the rail flange 301 and a post portion 50b which extends between the edge of the rail flange 301 and an adjacent part of the shoulder 200.
  • Figures 4a and 4b show a clip, which is M-shaped in plan, in an operative disposition in a rail fastening assembly.
  • the M-shaped clip is similar to that described in W093/12296.
  • a part joining the inner legs 6 of the M serves as a rail bearing portion 6a, free ends 7a of the outer legs 7 of the M engaging a shoulder 21 and overhanging the rail 300 when in use.
  • the assembly of Figures 4a and 4b also comprises respective toe and post insulators 50a' and 50b' , the toe insulator 50b' being carried by the rail bearing portion 6a of the clip.
  • the rail fastening assembly of Figure 5 is similar to that of Figure 3 in some respects, and like parts in Figure 5 are denoted by the same reference numerals as have been used in Figure 3. Unlike the assembly of Figure 3, however, the assembly of Figure 5 has a two-part insulator system comprising a post insulator 130 and a toe insulator 13, which toe insulator 13 is rotatable about the longitudinal axis of the toe portion la of the clip.
  • the toe insulator 13 of Figure 5 is shown in more detail in Figures 6a and 6b.
  • the insulator 13 has a load bearing surface 13c which is semi-circular in cross-section, and a longitudinal recess 12, having a depression 14 formed at the closed end of the insulator, for clipping onto the rail bearing portion of an appropriately adapted clip, such as that shown in Figure lOd.
  • FIG. 7a and 7b A modified form of the toe insulator 13 of Figures 6a and 6b is shown in Figures 7a and 7b.
  • the transverse cross-section of this insulator 13' resembles part of a hexagon, except insofar that the material which would otherwise form the corners of the hexagon has been omitted to allow clearance as the pad beneath the rail wears.
  • the external surface of the insulator 13' has three substantially equally-sized faces 13a, each having a slight radius, between which there are grooves 13b.
  • Figures 8a to 8d show alternative insulator shapes.
  • the insulator of Figure 8a has a triangular cross-section, that of Figure 8b a square cross- section, that of Figure 8c a pentagonal cross-section and that of Figure 8d a circular cross-section. It should be noted that these examples are merely some of many possible insulator shapes.
  • the recess 12 or passageway 12' is centrally located, but if the insulator is to be used for height adjustment, as described above, the recess 12 or passageway 12' is offset, as shown in Figure 9 .
  • Figures 10a to lOd show examples of the way in which the toe portions la of clips to which the invention is applied may be adapted to retain the insulator in such a way as to prevent longitudinal displacement thereof in use whilst permitting rotation of the insulator.
  • Figure 10a shows an annular groove 8 formed on the toe portion la of a clip intended to be used with an insulator 13, 13' having a circumferential protrusion formed inside the recess 12 or passageway 12' thereof.
  • Figure 10b shows an annular projection 9 formed on the toe portion la of a clip intended to be used with an insulator 13, 13' having a circumferential groove formed inside the recess 12 or passageway 12' thereof.
  • Figure 10c shows the toe la of a clip formed with a rolled thread 10 to engage with a corresponding thread formed within the recess 12 or passageway 12' of an insulator 13, 13' .
  • Figure lOd shows an offset 11 formed at the toe portion la of a clip for engaging a recess or depression 14 in an insulator 13 such as shown in Figure 8a.
  • connection between the insulator of Figures 5 to 10 and the rail bearing portion of the clip must be loose enough to allow the desired degree of rotation of the insulator on the toe of the clip, such that under the forces applied thereto in use the insulator is caused to rotate about the clip toe so as to substantially maintain optimum contact between the insulator and the rail flange.
  • insulators for use in assemblies embodying the present invention are preferably attached to the clips before delivery to the site of installation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Insulators (AREA)
  • Railway Tracks (AREA)
  • Clamps And Clips (AREA)

Abstract

Dans un ensemble permettant de fixer un rail de chemin de fer à une base de rail sous-jacente, un crapaud de fixation de rail résilient (1, 2, 3) comporte au moins une partie (1a) qui, en fonctionnement, porte sur, et s'étend sensiblement parallèlement à, un patin (301) d'un rail adjacent (300), et retient un isolateur (13, 13') qui permet d'isoler électriquement le crapaud (1, 2, 3) par rapport au rail (300). L'isolateur (13) est maintenu en contact avec le crapaud (1, 2, 3). Celui-ci comporte une partie porteuse de rail, de section sensiblement circulaire, qui permet à l'isolateur de pivoter autour de l'axe longitudinal de ladite partie porteuse (1a). A la différence de la technique actuelle, l'isolateur s'aligne automatiquement sur le patin du rail (301) quand ce dernier bouge. L'un des isolateurs de l'invention comporte au moins deux surfaces porteuses (13a), ce qui lui permet de pivoter de façon à présenter au patin du rail (301) une surface porteuse non usée (13a). L'épaisseur de matériau entre les surfaces porteuses (13a) de l'isolateur (13, 13') et la partie porteuse de rail (1a) du crapaud (1, 2, 3) peut être choisie de façon à varier entre les surfaces porteuses adjacentes (13a), de façon que l'isolateur (13) puisse tourner et ainsi s'ajuster à la hauteur de la partie porteuse (1a) au-dessus du patin (301).
PCT/GB1996/000739 1996-03-27 1996-03-27 Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes WO1997036055A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96909213A EP0828891B1 (fr) 1996-03-27 1996-03-27 Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes
PCT/GB1996/000739 WO1997036055A1 (fr) 1996-03-27 1996-03-27 Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB1996/000739 WO1997036055A1 (fr) 1996-03-27 1996-03-27 Ensembles de fixation de rail de chemin de fer comprenant des crapauds de fixation de rail resilients, et isolateurs associes

Publications (1)

Publication Number Publication Date
WO1997036055A1 true WO1997036055A1 (fr) 1997-10-02

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Country Status (2)

Country Link
EP (1) EP0828891B1 (fr)
WO (1) WO1997036055A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6702192B2 (en) 1998-10-14 2004-03-09 Jude O. Igwemezie Rail retaining device
WO2011020795A1 (fr) 2009-08-21 2011-02-24 Pandrol Limited Isolateur d'éclisses et éclisses s'utilisant avec
WO2012025201A1 (fr) * 2010-08-27 2012-03-01 Schwihag Ag Système de fixation de rail
US8905322B2 (en) 2009-08-21 2014-12-09 Pandrol Limited Railway rail pad
EP3346054B1 (fr) 2017-01-10 2021-12-01 Schwihag Ag Pince de serrage et système de fixation de rail destinés à la fixation de rails de chemins de fer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386315A (en) * 1943-08-02 1945-10-09 Rails Co Adjustable resilient rail fastening
GB1126697A (en) * 1966-11-07 1968-09-11 Lockspike Ltd A railway rail and fastening arrangement
USRE28291E (en) * 1970-06-12 1974-12-31 Borup etal spring-loaded clamping devices for fastening railroad rails
GB2211229A (en) * 1987-10-19 1989-06-28 Pandrol Ltd A clip which is suitable for fastening a railway rail and a railway rail-and-fastening assembly including the clip
EP0401424A1 (fr) * 1989-06-02 1990-12-12 Vossloh-Werke GmbH Dispositif de fixation de rail sur des traverses en béton ou similaire par des attaches élastiques
WO1993012295A1 (fr) * 1991-12-18 1993-06-24 Pandrol Limited Elements d'isolation pour ensembles de fixation de rails de chemin de fer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2386315A (en) * 1943-08-02 1945-10-09 Rails Co Adjustable resilient rail fastening
GB1126697A (en) * 1966-11-07 1968-09-11 Lockspike Ltd A railway rail and fastening arrangement
USRE28291E (en) * 1970-06-12 1974-12-31 Borup etal spring-loaded clamping devices for fastening railroad rails
GB2211229A (en) * 1987-10-19 1989-06-28 Pandrol Ltd A clip which is suitable for fastening a railway rail and a railway rail-and-fastening assembly including the clip
EP0401424A1 (fr) * 1989-06-02 1990-12-12 Vossloh-Werke GmbH Dispositif de fixation de rail sur des traverses en béton ou similaire par des attaches élastiques
WO1993012295A1 (fr) * 1991-12-18 1993-06-24 Pandrol Limited Elements d'isolation pour ensembles de fixation de rails de chemin de fer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6702192B2 (en) 1998-10-14 2004-03-09 Jude O. Igwemezie Rail retaining device
WO2011020795A1 (fr) 2009-08-21 2011-02-24 Pandrol Limited Isolateur d'éclisses et éclisses s'utilisant avec
US8888012B2 (en) 2009-08-21 2014-11-18 Pandrol Limited Insulator for railway fastening clip and railway rail fastening clip for use therewith
US8905322B2 (en) 2009-08-21 2014-12-09 Pandrol Limited Railway rail pad
AU2010285083B2 (en) * 2009-08-21 2014-12-11 Pandrol Limited Insulator for railway fastening clip and railway rail fastening clip for use therewith
WO2012025201A1 (fr) * 2010-08-27 2012-03-01 Schwihag Ag Système de fixation de rail
EP3346054B1 (fr) 2017-01-10 2021-12-01 Schwihag Ag Pince de serrage et système de fixation de rail destinés à la fixation de rails de chemins de fer

Also Published As

Publication number Publication date
EP0828891A1 (fr) 1998-03-18
EP0828891B1 (fr) 2002-06-05

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