EP0095210B1 - Chair for attaching railroad rails and a method of manufacturing a chair - Google Patents

Chair for attaching railroad rails and a method of manufacturing a chair Download PDF

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Publication number
EP0095210B1
EP0095210B1 EP83200696A EP83200696A EP0095210B1 EP 0095210 B1 EP0095210 B1 EP 0095210B1 EP 83200696 A EP83200696 A EP 83200696A EP 83200696 A EP83200696 A EP 83200696A EP 0095210 B1 EP0095210 B1 EP 0095210B1
Authority
EP
European Patent Office
Prior art keywords
members
chair
envelope
sole plate
injection
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
Application number
EP83200696A
Other languages
German (de)
French (fr)
Other versions
EP0095210A1 (en
Inventor
Jozef Henri Jansen
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Priority to AT83200696T priority Critical patent/ATE14903T1/en
Publication of EP0095210A1 publication Critical patent/EP0095210A1/en
Application granted granted Critical
Publication of EP0095210B1 publication Critical patent/EP0095210B1/en
Expired legal-status Critical Current

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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
    • E01B9/04—Fastening on wooden or concrete sleepers or on masonry without clamp members
    • E01B9/14—Plugs, sleeves, thread linings, or other inserts for holes in sleepers
    • E01B9/18—Plugs, sleeves, thread linings, or other inserts for holes in sleepers for concrete sleepers

Definitions

  • the invention relates to a chair for attaching a railroad rail to a sleeper, comprising a sole plate with clips on one side for holding the rail and with one or more members projecting from the other side to be embedded in the sleeper, said member or members and said other side of the sole plate being encased in an electrically non-conductive envelope.
  • the invention also relates to a method of manufacturing a chair for the attachment of a railroad rail.
  • An envelope generally used consists of a glass-fibre reinforced polyester material.
  • the envelope is cast around the relevant parts of the chair by means of a solvent casting process.
  • the known chair has members which are to be enveloped and which are angular in cross-section.
  • a casting material and a solvent casting process have been chosen so as not to damage the glass fibres during the formation of the envelope. Damage to the glass fibres leads to reduction in the strength of the envelope.
  • Solvent casting processes have the disadvantage of being time-consuming and being less suitable from a point of view of environmental pollution due to the use of solvents.
  • the invention is based on the discovery that a sufficiently strong envelope can also be obtained by a varied geometry of the chair in combination with injection moulding.
  • the chair according to the invention is characterized in that the cross-section of said member or each of said members (3) in a direction transverse to the directipn in which the member projects from the sole plate has a curved circumference and the envelope is made of a glass-fibre-reinforced polyester injection-moulding material.
  • the method according to the invention is characterized in that the member or members (3) projecting from the sole plate and the side of this plate from which said member or member projects or project are arranged in an injection mould and a glass-fibre-reinforced polyester envelope is injection moulded around said member or members (3) and on the side of the sole plate (1) from which the member or members (3) projects or project.
  • Injection moulding is to be understood herein to mean a method in which the injection moulding material is injected at a pressure of 200 kg or more per cm 2 .
  • the or each projecting member preferably has circumferential ridges.
  • a particularly practical construction of the method in accordance with the invention is characterized in that the sole plate of the tie-plate is used as a boundary surface of the mould.
  • the chair shown in Fig. 1 comprises a sole plate (1), on one side of which are formed two clips (2) for holding a railroad rail.
  • the rail which is not shown in the drawing, is clamped between the clips (2).
  • Elongate members (3) project from the other side of the plate (1). These members are embedded in a sleeper, not shown, to attach the chairto the sleeper.
  • the members (3) may comprise circumferential ridges (5).
  • the sleeper many be manufactured from concrete.
  • the members (3) can be moulded into the concrete during the manufacture of the sleeper. Alternatively, they may be inserted afterwards in holes which are provided in the sleepers.
  • the sole plate (1), clips (2) and members (3) are usually manufactured from metal, for example by casting or forging or combinations thereof.
  • Fig. 2a shows the transverse of a member (3).
  • Figs. 2b and 2c show, by way of example, other possible transverse cross-sections of the members (3). According to the invention it is essential for the transverse cross-section of each of the members (3) to have a curved circumference so that the members have no sharp edges.
  • Reference numeral (4) in Fig. 1 and Figs. 2a, 2b and 2c denotes an injection-moulded envelope of a glass-fibre-reinforced polyester resin.
  • the envelope may have a thickness of from 0.5 to 10 mm; a thickness of 3 mm gives good results.
  • the envelope usually comprises fillers, dyes, hardener and catalyst.
  • Fig. 1 shows a chair having two members (3).
  • Other constructions are also possible in which, for example, a single U-shaped member is used; such a member may be considered as being constituted by two members similar to the two members (3) shown in Fig. 1, inter-connected by a cross-piece.
  • the moulding material can best be injected at the ends of the members (3).
  • an injection mould in which the two members (3) fit with a small clearance (corresponding to the desired thickness of the envelope).
  • This mould is sealed at one end by the sole plate (1), which is pressed against the mould by means of a clamp.
  • the injection-moulding material is injected into the mould via an aperture.
  • This aperture is preferably located near the free ends of the members (3), i.e., the ends remote from the sole plate (1).

Abstract

The invention provides a chair for railroad rails. The tie-plate (1) is partly enveloped in synthetic resin (4). By a special construction of the chair (no sharp edges) and injection moulding it has proved possible to obtain a sufficiently strong envelope of synthetic resin (4). The envelope (4) is made of a glass-fibre-reinforced polyester injection-moulding material.

Description

  • The invention relates to a chair for attaching a railroad rail to a sleeper, comprising a sole plate with clips on one side for holding the rail and with one or more members projecting from the other side to be embedded in the sleeper, said member or members and said other side of the sole plate being encased in an electrically non-conductive envelope. The invention also relates to a method of manufacturing a chair for the attachment of a railroad rail.
  • Railroad rails are attached to sleepers by means of chairs. Nowadays various control signals are transmitted through the rails for guiding trains, for indicating the positions of trains on the rails and the like. Transmitting control signals through the rails is possible only if the rails are insulated electrically with respect to earth. Because of the large forces which are exerted on the rails and on the chairs, the latter are manufactured from metal. Therefore the chairs are electrically conductive in themselves. Moreover, the chairs are in contact with the sleepers and hence with earth. To overcome this problem, chairs are used which are partly encased in an electrically non-conductive envelope of synthetic resin. This envelope must be sufficiently strong to be able to withstand the forces which are exerted on the chair. An envelope generally used consists of a glass-fibre reinforced polyester material. The envelope is cast around the relevant parts of the chair by means of a solvent casting process. The known chair has members which are to be enveloped and which are angular in cross-section. A casting material and a solvent casting process have been chosen so as not to damage the glass fibres during the formation of the envelope. Damage to the glass fibres leads to reduction in the strength of the envelope.
  • Solvent casting processes have the disadvantage of being time-consuming and being less suitable from a point of view of environmental pollution due to the use of solvents.
  • The invention is based on the discovery that a sufficiently strong envelope can also be obtained by a varied geometry of the chair in combination with injection moulding.
  • The chair according to the invention is characterized in that the cross-section of said member or each of said members (3) in a direction transverse to the directipn in which the member projects from the sole plate has a curved circumference and the envelope is made of a glass-fibre-reinforced polyester injection-moulding material.
  • The method according to the invention is characterized in that the member or members (3) projecting from the sole plate and the side of this plate from which said member or member projects or project are arranged in an injection mould and a glass-fibre-reinforced polyester envelope is injection moulded around said member or members (3) and on the side of the sole plate (1) from which the member or members (3) projects or project.
  • It has proved possible to obtain a sufficiently strong envelope by means of injection moulding if the aforesaid cross-section of the projecting member or each of the projecting members has a curved circumference so that the member has no sharp edges. Injection moulding is to be understood herein to mean a method in which the injection moulding material is injected at a pressure of 200 kg or more per cm2.
  • The or each projecting member preferably has circumferential ridges.
  • A particularly practical construction of the method in accordance with the invention is characterized in that the sole plate of the tie-plate is used as a boundary surface of the mould.
  • The invention will now be described in greater detail by way of example, with reference to a drawing, in which
    • Fig. 1 is an elevation of a chair according to the invention with the envelope shown in section,
    • Fig. 2a is a cross-sectional view taken on the line 11-11 of Fig. 1, and
    • Figs. 2b and 2c show two further possibilities for this cross-section.
  • The chair shown in Fig. 1 comprises a sole plate (1), on one side of which are formed two clips (2) for holding a railroad rail. The rail, which is not shown in the drawing, is clamped between the clips (2). Elongate members (3) project from the other side of the plate (1). These members are embedded in a sleeper, not shown, to attach the chairto the sleeper. For a more secure attachment the members (3), as shown in the drawing, may comprise circumferential ridges (5). The sleeper many be manufactured from concrete. The members (3) can be moulded into the concrete during the manufacture of the sleeper. Alternatively, they may be inserted afterwards in holes which are provided in the sleepers.
  • The sole plate (1), clips (2) and members (3) are usually manufactured from metal, for example by casting or forging or combinations thereof.
  • Fig. 2a shows the transverse of a member (3). Figs. 2b and 2c show, by way of example, other possible transverse cross-sections of the members (3). According to the invention it is essential for the transverse cross-section of each of the members (3) to have a curved circumference so that the members have no sharp edges.
  • Reference numeral (4) in Fig. 1 and Figs. 2a, 2b and 2c denotes an injection-moulded envelope of a glass-fibre-reinforced polyester resin. The envelope may have a thickness of from 0.5 to 10 mm; a thickness of 3 mm gives good results. In addition to the polyester resin and the glass fibres, the envelope usually comprises fillers, dyes, hardener and catalyst.
  • Fig. 1 shows a chair having two members (3). Other constructions are also possible in which, for example, a single U-shaped member is used; such a member may be considered as being constituted by two members similar to the two members (3) shown in Fig. 1, inter-connected by a cross-piece.
  • When moulding the envelope the moulding material can best be injected at the ends of the members (3).
  • In a particularly simple example of the method in accordance with the invention, an injection mould is used in which the two members (3) fit with a small clearance (corresponding to the desired thickness of the envelope). This mould is sealed at one end by the sole plate (1), which is pressed against the mould by means of a clamp. The injection-moulding material is injected into the mould via an aperture. This aperture is preferably located near the free ends of the members (3), i.e., the ends remote from the sole plate (1).

Claims (4)

1. A chair for attaching a railroad rail to a sleeper, comprising a sole plate (1) with clips (2) on one side for holding the rail and with one or more members (3) projecting from the other side to be embedded in the sleeper, said member or members (3) and said other side of the sole plate (1) being encased in an electrically non-conductive envelope (4) of synthetic resin, characterized in that the cross-section of said member or each of said members (3) in a direction transverse to the direction in which the member projects from the sole plate has a curved circumference and the envelope is made of glass-fibre-reinforced polyester injection-moulding material,
2. A chair as claimed in Claim 1, characterized in that members (3) comprise circumferential ridges (5).
3. A method of manufacturing a chair as claimed in Claim 1, characterized in that the member or members (3) projecting from the sole plate and the side of this plate from which said member or members projects or project are arranged in an injection mould and a glass-fibre-reinforced polyester envelope is injection moulded around said member or members (3) and on the side of the sole plate (1) from which the member or members (3) projects or project.
4. A method as claimed in Claim 3, characterized in that sole plate (1) is used as a boundary surface of the mould.
EP83200696A 1982-05-21 1983-05-17 Chair for attaching railroad rails and a method of manufacturing a chair Expired EP0095210B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83200696T ATE14903T1 (en) 1982-05-21 1983-05-17 DEVICE FOR FIXING RAILROAD RAILS AND METHOD OF MAKING SUCH DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8202093A NL8202093A (en) 1982-05-21 1982-05-21 CLAMP FOR ATTACHING RAIL RAILS, METHOD FOR MANUFACTURING A CLAMP.
NL8202093 1982-05-21

Publications (2)

Publication Number Publication Date
EP0095210A1 EP0095210A1 (en) 1983-11-30
EP0095210B1 true EP0095210B1 (en) 1985-08-14

Family

ID=19839768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200696A Expired EP0095210B1 (en) 1982-05-21 1983-05-17 Chair for attaching railroad rails and a method of manufacturing a chair

Country Status (5)

Country Link
EP (1) EP0095210B1 (en)
JP (1) JPS58207401A (en)
AT (1) ATE14903T1 (en)
DE (1) DE3360562D1 (en)
NL (1) NL8202093A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3728304A1 (en) * 1987-08-25 1989-03-16 Strabag Bau Ag Railway sleeper

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0181607B1 (en) * 1984-11-08 1989-05-31 Preussag Stahl Aktiengesellschaft Device for fixing railroad rails on steel y-sleepers
DE3521673A1 (en) * 1984-11-08 1986-05-22 Stahlwerke Peine-Salzgitter Ag, 3320 Salzgitter Device for fastening rails of a railway on steel sleepers, in particular on Y-type steel sleepers
EP0194550B1 (en) * 1985-03-15 1989-09-06 Vossloh-Werke GmbH Securing clamp and fastening device for railway rails
JPH0434162Y2 (en) * 1986-04-28 1992-08-14
OA09065A (en) * 1987-10-19 1991-10-31 Pandrol Ltd Fastening railway rails.
BE1003927A3 (en) * 1990-10-31 1992-07-14 Betonkonstruktie V D Hemiksem Improved element for attaching a rail to a concrete sleeper

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1108300A (en) * 1953-09-18 1956-01-11 Everts & Van Der Weyden N V Concrete sleeper with buffered holes for fixing rails
GB865120A (en) * 1958-05-07 1961-04-12 Samuel Tippett Improvements relating to the holding down of rails on sleepers
FR1296107A (en) * 1961-05-06 1962-06-15 Querne & Cie E Method for consolidating lag bolts, especially railroad tie lag bolts
GB961876A (en) * 1961-12-15 1964-06-24 Samuel Tippett Improvements relating to sleeves for use in holding down railway lines on sleepers
FR2315568A1 (en) * 1975-06-25 1977-01-21 Vape Sa Ets SCREW FIXING DEVICE IN A CONSTRUCTION ELEMENT IN AGGLOMERATED MATERIAL

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3728304A1 (en) * 1987-08-25 1989-03-16 Strabag Bau Ag Railway sleeper

Also Published As

Publication number Publication date
JPS58207401A (en) 1983-12-02
EP0095210A1 (en) 1983-11-30
ATE14903T1 (en) 1985-08-15
NL8202093A (en) 1983-12-16
DE3360562D1 (en) 1985-09-19

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