GB2121461A - A pad for positioning under a railway rail and an assembly including the pad - Google Patents
A pad for positioning under a railway rail and an assembly including the pad Download PDFInfo
- Publication number
- GB2121461A GB2121461A GB08216852A GB8216852A GB2121461A GB 2121461 A GB2121461 A GB 2121461A GB 08216852 A GB08216852 A GB 08216852A GB 8216852 A GB8216852 A GB 8216852A GB 2121461 A GB2121461 A GB 2121461A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pad
- rail
- clip
- elastomeric material
- opposite sides
- 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.)
- Granted
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
- E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
- E01B9/685—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape
- E01B9/686—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape with textured surface
-
- 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
- E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
- E01B9/685—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape
Abstract
In a composite rail pad (2) for interposition between the bottom of a railway rail and a rail foundation upon which the rail stands, the pad is substantially rectangular with an upper major face thereof having a substantially rectangular central portion (19) of elastomeric material, e.g. rubber, bordered on only two opposite sides by a relatively hard material (20), e.g. of ethylene vinyl acetate. Two substantially rectangular locating recesses (21) can extend through the harder material right through the pad substantially at the centres of the opposite sides of the pad having the harder material. A railway rail and fastening assembly incorporating the pad is also described. <IMAGE>
Description
SPECIFICATION
A pad for positioning under a railway rail and
an assembly including the pad
It is known to interpose a pad between the
bottom of a railway rail and a rail foundation upon
which the rail stands. If the rail foundation is a
concrete sleeper extending across the railway track or a concrete slab running along the railway track, the pad compensates for uneveness of the upper surface of the concrete, it provides the electrical insulation which is necessary if the rails are to be used to carry electric current for signalling and damps vibration which would otherwise be transmitted from the rail to the concrete with resultant damage to the concrete. A pad, to provide electrical insulation, is also useful in the case where the rail foundation is a steel sleeper.
According to the invention, there is provided a pad for interposition between the bottom of a railway rail and a rail foundation upon which the rail stands, the pad being substantially rectangular and comprising an upper major face and a lower major face, the upper major face having a substantially rectangular central portion of elastomeric material bordered on only two opposite sides by a relatively hard material.
The elastomeric material may be of rubber and relative hard material may be a plastics material.
The plastics material may be constituted by ethylene vinyl acetate.
The elastomeric material may be bonded or vulcanised to the harder material.
Two substantially rectangular recesses can extend through the harder material right through the pad substantially at the centres of the opposite sides of the pad having the harder material. The recesses are preferably not made by cutting the recesses out but by moulding to the desired shaped. Projections extending upwardly from the rail foundation can lie partly in these recesses and impede movement of the pad along the rail.
The harder material can extend completely underneath the elastomeric material thereby to form the lower major face of the pad. Instead, the harder material can extend only partly underneath the elastomeric material, a hole being provided in a central part of the harder material and the elastomeric material can then have a central protruding base portion which extends through the hole in the harder material to lie directly on the rail foundation. In this case, the elastomeric material need not be joined to the harder material.
In all cases, the elastomeric material extends to the two opposite sides of the pad which are not bordered by the harder material at the upper face.
Preferably, the length of the pad is in the range of 125 to 200 mm, the span of the pad perpendicular to its length is in the range of 100 to 250 mm, the distance between the substantially rectangular recesses, where they are provided in the opposite sides of the pad, is in the range of 95 to 1 60 mm, and the thickness of the pad is in the range 3 to 20 mm. The harder material, where it forms the opposite sides of the pad, is preferably less thick than the central portion of the pad having the elastomeric material.
The pad may have recesses in either the lower major face or the upper major face or in both and these recesses may be grooves, for example of rectangular cross-section, extending either parallel or transversely of the opposite sides of ths pad formed by the harder material. Instead of recesses, studs, slots or holes can be provided in the or each major face. These features allow displacement, particularly lateral, of the pad when it is subjected to compression on the passage of a train over it.
Particularly in the case where the pad is not provided with recesses in the harder material in the opposite sides of the pad, the pad can be utilised in a rail-and-fastening assembly where the pad is fitted into a recess provided across the width of a sleeper forming the rail foundation.
According to the invention, there is also provided a railway rail and fastening assembly comprising a rail foundation, two projections extending upwardly from the rail foundation, a pad according to the invention, with or without any one or more of the additional features expressed above, laid on the rail foundation with said one major face facing upwardly, a rail laid on the pad between the projections, and means engaging the projections and holding the rail down. In the case where said substantially rectangular recesses are provided in the opposite sides of said pad in said harder material, parts of the projections are in said substantially rectangular recesses such that the projections impede movement of the pad along the rail.
The rail foundation may be a concrete or steel sleeper extending across the railway track or a continuous slab of concrete running along the railway track.
For a better understanding of the invention and to show how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings, in which: Figures 1 and 2 shows two side views and
Figure 3 shows a plan view of a railway rail and fastening assembly, parts being omitted for the sake of clarity,
Figures 4 to 6 show three views of a resilient railway rail-fastening member forming part of the arrangement shown in Figures 1 to 3, Figures 4 and 6 showing views taken as indicated by the arrow IV and VII respectively, in Figure 5, and
Figure 7 shows a perspective view of a pad according to the invention forming part of the arrangement shown in Figures 1 to 3.
In Figures 1 and 3 there is shown the flange 1 of a flange-footed railway rail resting on a pad 2 which is laid on the upper surface 3A of a concrete railway sleeper 3 having chamfered upper edges 38. On each side of the rail there is an arrangement for holding the rail down, the two arrangements being similar but only one of them being shown. it includes a clip as described below and illustrated in Figures 4 to 6. Only three limbs 7, 8 and 9 of the clip are shown, in dotted lines, in
Figure 1. On the edge of the flange there is placed an electrical insulator consisting of an elongate nylon moulding of approximate L-shaped crosssection, one limb 5 of which lies on the rail flange and has the limb 9 of the clip bearing upon it, whereas the other limb 6 lies against the side of the rail flange and has portions 10 extending from opposite ends of it.
An anchoring member is fixed to the sleeper, this consisting of a malleable iron casting and comprising a flat surface 11 lying on the upper surface 3A of the sleeper, a projecting leg 12 extending downwardly into the sleeper, a block portion 13, substantially square as seen in plan, extending upwardly from the surface 11, a concave surface 14 at the top of the block portion 13 and a passage 1 5 of circular cross-section, having flared mouths 1 so, in the block portion 13, the passage 1 5 being substantially parallel to the length of the rail. The block portion 1 3 constitutes a projection extending upwardly from the sleeper.The limb 7 of the rail clip is driven in the passage 1 5 and presses upwardly on the upper surface of the passage, whereas the limb 8 of the rail clip presses downwardly on the concave surface 14. Part of the block portion 13 lies between the portions 10 of the insulator 4 so that the insulator is prevented from sliding along the rail, when the clip is being driven into position by one of the portions 10 abutting the block portion 13.
The leg 1 2 of the anchoring member is formed with protuberances 1 6 on all four sides and it is cast in the concrete, that is to say incorporated in the concrete before the latter has set.
Referring to Figures 4 to 6, proceeding along the bar from which the clip was made, from end to end, it has first, second, third, fourth and fifth portions referenced 7, 17, 9, 18 and 8 respectively. When the clip is in use the first portion 7, which is a substantially straight leg, is horizontal and parallel to the rail and when the clip is viewed from above the third and fifth portions 8 and 9 appear to be on opposite sides of the axis of the first portion 7. Each of the portions 1 7 and 1 8 is single reverse bend. The clip is made by bending a resilient steel bar of circular cross-section and providing it with a flat surface 9A extending along a short length of the limb 9 of the clip. This flat surface is in contact with and bears downwardly upon the limb 5 of the insulator 4.
If the clip were so positioned that the limbs 8 of it bears upon the limb 5 of the insulator 4, then the limb 8, instead of the limb 9, could be provided with a flat surface making contact with the insulator material.
The pad 2 is shown in Figure 7. It is composed of two parts, one part being a substantially rectangular central portion 1 9 of elastomeric material and the other part 20 bordering on only two opposite sides of the central portion 1 9, the other part being of a relatively hard material. In the form shown, rectangular recesses 21 are provided at the centres of the opposite sides of the pad and extending right through the pad. The harder material extends underneath the central portion 1 9 of elastomeric material and has a substantially rectangular hole 22 through which extends a projection from the lower face of the central portion 1 9 of elastomeric material, this projection allowing the elastomeric material to be in contact with the rail foundation when in situ.In practice, the thickness of the bordering portions of the second part 20 will be less than the thickness of the central portion of the pad including the first part 19.
Claims (Filed on 9 June '83)
1. A pad for interposition between the bottom of a railway rail and a rail foundation upon which the rail stands, the pad being substantially rectangular and comprising an upper major face and a lower major face, the upper major face having a substantially rectangular central portion of elastomeric material bordered on only two opposite sides by a relatively hard material.
2. A pad as claimed in Claim 1, wherein said elastomeric material is rubber.
3. A pad as claimed in Claim 1 or 2, wherein said relatively hard material is a plastics material.
4. A pad as claimed in Claim 3, wherein said plastics material is ethylene vinyl acetate.
5. A pad as claimed in any one of the preceding claims, wherein said elastomeric material is bonded or vulcanised to the harder material.
6. A pad as claimed in any one of the preceding
claims, wherein two substantially rectangular
recesses extend through the harder material
right through the pad substantially at the centres of the opposite sides of the pad having the harder
material.
7. A pad as claimed in Claim 6, wherein said
recesses have been moulded during manufacture of the pad.
8. A pad as claimed in any one of the preceding claims, wherein said relatively hard material extends completely underneath the elastomeric material, thereby forming the lower major face of the pad.
9. A pad as claimed in any one of Claims 1 to 7, wherein said relatively hard material extends only partly underneath the elastomeric material, a
hole being provided in a central part of the hardened material and the elastomeric material having a central protruding base portion which extends through the hole in the relatively hard material to lie directly on the rail foundation.
10. A pad as claimed in any one of the preceding claims, wherein said elastomeric material extends to the two opposite sides of the pad which are not bordered by the relatively hard material at the upper face.
11. A pad as claimed in any one of the preceding claims, wherein said relatively hard material, where it forms the opposite sides of the
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (23)
1. A pad for interposition between the bottom of a railway rail and a rail foundation upon which the rail stands, the pad being substantially rectangular and comprising an upper major face and a lower major face, the upper major face having a substantially rectangular central portion of elastomeric material bordered on only two opposite sides by a relatively hard material.
2. A pad as claimed in Claim 1, wherein said elastomeric material is rubber.
3. A pad as claimed in Claim 1 or 2, wherein said relatively hard material is a plastics material.
4. A pad as claimed in Claim 3, wherein said plastics material is ethylene vinyl acetate.
5. A pad as claimed in any one of the preceding claims, wherein said elastomeric material is bonded or vulcanised to the harder material.
6. A pad as claimed in any one of the preceding
claims, wherein two substantially rectangular
recesses extend through the harder material
right through the pad substantially at the centres of the opposite sides of the pad having the harder
material.
7. A pad as claimed in Claim 6, wherein said
recesses have been moulded during manufacture of the pad.
8. A pad as claimed in any one of the preceding claims, wherein said relatively hard material extends completely underneath the elastomeric material, thereby forming the lower major face of the pad.
9. A pad as claimed in any one of Claims 1 to 7, wherein said relatively hard material extends only partly underneath the elastomeric material, a
hole being provided in a central part of the hardened material and the elastomeric material having a central protruding base portion which extends through the hole in the relatively hard material to lie directly on the rail foundation.
10. A pad as claimed in any one of the preceding claims, wherein said elastomeric material extends to the two opposite sides of the pad which are not bordered by the relatively hard material at the upper face.
11. A pad as claimed in any one of the preceding claims, wherein said relatively hard material, where it forms the opposite sides of the
pad, is less thick than the central portion of the pad having the elastomeric material.
12. A pad as claimed in any one of the preceding claims and having recesses in either the lower major face or the upper major face or in both.
13. A pad as claimed in Claim 12, wherein said recesses in the lower major face and/or the upper major face are constituted by grooves of rectangular cross-section.
14. A pad as claimed in Claim 13, wherein said grooves extend parallel to the opposite sides of the pad formed by the relatively hard material.
1 5. A pad as claimed in Claim 13, wherein said grooves extend transversely of the opposite sides of the pad formed by the relatively hard material.
1 6. A pad as claimed in any one of Claims 1 to 11, wherein studs, slots or holes are provided in the or each major face.
17. A pad for interposition between the bottom of a railway rail and a rail foundation upon which the rail stands, substantially as hereinbefore described with reference to Figure 7 of the accompanying drawings.
1 8. A railway rail and fastening assembly comprising a rail foundation, two projections extending upwardly from the rail foundation, a pad as claimed in any one of the preceding claims laid on the rail foundation with said one major face facing upwardly, a rail laid on the pad between the projections, and means engaging the projections and holding the rail down.
19. An assembly as claimed in Claim 18, including a pad as claimed in Claim 6 or any one of Claims 7 to 1 6 as appendant to Claim 6, wherein parts of the projections are in said substantially rectangular recesses such that the projections impede movement of the pad along the rail.
20. An assembly as claimed in Claim 18 or 19, wherein the rail foundation is a concrete sleeper extending across the railway track.
21. An assembly as claimed in Claim 1 8 or 19, wherein the rail foundation is a steel sleeper extending across the railway track.
22. An assembly as claimed in Claim 18 or 19, wherein the rail foundation is a continuous slab of concrete running along the railway track.
23. A railway rail and fastening assembly as claimed in Claim 18, substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08216852A GB2121461B (en) | 1982-06-10 | 1982-06-10 | A pad for positioning under a railway rail and an assembly including the pad |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08216852A GB2121461B (en) | 1982-06-10 | 1982-06-10 | A pad for positioning under a railway rail and an assembly including the pad |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2121461A true GB2121461A (en) | 1983-12-21 |
| GB2121461B GB2121461B (en) | 1985-09-04 |
Family
ID=10530941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08216852A Expired GB2121461B (en) | 1982-06-10 | 1982-06-10 | A pad for positioning under a railway rail and an assembly including the pad |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2121461B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223046A (en) * | 1988-09-22 | 1990-03-28 | British Steel Plc | Rail having composite vibration-absorbing body secured thereto |
| GB2237833A (en) * | 1989-11-08 | 1991-05-15 | Pandrol Ltd | Rail pad |
| US5261599A (en) * | 1989-11-08 | 1993-11-16 | Pandrol Limited | Rail pads |
| EP0710743A1 (en) * | 1994-11-02 | 1996-05-08 | Illinois Tool Works Inc. | Railroad track, railroad tie and pad for it |
| US5549245A (en) * | 1994-11-02 | 1996-08-27 | Illinois Tool Works Inc. | Composite pad useful between railroad rail and railroad tie |
| US5551632A (en) * | 1994-11-02 | 1996-09-03 | Illinois Tool Works Inc. | Elastomeric pad between railroad rail and railroad tie |
| US5551633A (en) * | 1994-11-02 | 1996-09-03 | Illinois Tool Works, Inc. | Elastomeric pad between railroad rail and railroad tie |
| US5730357A (en) * | 1996-10-03 | 1998-03-24 | Airboss Of America Corp. | Railroad tie pad |
| DE10148411A1 (en) * | 2001-09-29 | 2003-04-17 | Hada Gmbh & Co Kg Kunststoffve | Device for elastic mounting of rails on sleepers comprises at least one plastic base element which is joinable to at least one elastic insert |
| GB2408281A (en) * | 2003-10-28 | 2005-05-25 | Corus Uk Ltd | An inclined plastics rail pad |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1397032A (en) * | 1973-06-21 | 1975-06-11 | Pandrol Ltd | Pad for positioning under a railway rail and an assembly including the pad |
| GB1427974A (en) * | 1972-06-13 | 1976-03-10 | Lesteel Spring Co Ltd | Base plate for a rail |
| GB1542766A (en) * | 1976-06-11 | 1979-03-28 | Lesteel Spring Co Ltd | Support and/or locating means for rails in rail tracks |
| GB2051187A (en) * | 1979-06-13 | 1981-01-14 | Tokai Rubber Ind Ltd | Composite Rail Pad |
| GB2106570A (en) * | 1981-09-18 | 1983-04-13 | Karmic Limited | Electrical insulator pad |
-
1982
- 1982-06-10 GB GB08216852A patent/GB2121461B/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1427974A (en) * | 1972-06-13 | 1976-03-10 | Lesteel Spring Co Ltd | Base plate for a rail |
| GB1397032A (en) * | 1973-06-21 | 1975-06-11 | Pandrol Ltd | Pad for positioning under a railway rail and an assembly including the pad |
| GB1542766A (en) * | 1976-06-11 | 1979-03-28 | Lesteel Spring Co Ltd | Support and/or locating means for rails in rail tracks |
| GB2051187A (en) * | 1979-06-13 | 1981-01-14 | Tokai Rubber Ind Ltd | Composite Rail Pad |
| GB2106570A (en) * | 1981-09-18 | 1983-04-13 | Karmic Limited | Electrical insulator pad |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223046A (en) * | 1988-09-22 | 1990-03-28 | British Steel Plc | Rail having composite vibration-absorbing body secured thereto |
| US5011077A (en) * | 1988-09-22 | 1991-04-30 | British Steel Plc | Railways |
| GB2223046B (en) * | 1988-09-22 | 1992-04-08 | British Steel Plc | Improvements in to railways |
| GB2237833A (en) * | 1989-11-08 | 1991-05-15 | Pandrol Ltd | Rail pad |
| US5261599A (en) * | 1989-11-08 | 1993-11-16 | Pandrol Limited | Rail pads |
| GB2237833B (en) * | 1989-11-08 | 1993-12-01 | Pandrol Ltd | Rail pads |
| EP0710743A1 (en) * | 1994-11-02 | 1996-05-08 | Illinois Tool Works Inc. | Railroad track, railroad tie and pad for it |
| US5549245A (en) * | 1994-11-02 | 1996-08-27 | Illinois Tool Works Inc. | Composite pad useful between railroad rail and railroad tie |
| US5551632A (en) * | 1994-11-02 | 1996-09-03 | Illinois Tool Works Inc. | Elastomeric pad between railroad rail and railroad tie |
| US5551633A (en) * | 1994-11-02 | 1996-09-03 | Illinois Tool Works, Inc. | Elastomeric pad between railroad rail and railroad tie |
| US5730357A (en) * | 1996-10-03 | 1998-03-24 | Airboss Of America Corp. | Railroad tie pad |
| DE10148411A1 (en) * | 2001-09-29 | 2003-04-17 | Hada Gmbh & Co Kg Kunststoffve | Device for elastic mounting of rails on sleepers comprises at least one plastic base element which is joinable to at least one elastic insert |
| DE10148411B4 (en) * | 2001-09-29 | 2005-12-15 | Hada Gmbh + Co. Kg Kunststoffverarbeitung | Elastic storage of rails |
| GB2408281A (en) * | 2003-10-28 | 2005-05-25 | Corus Uk Ltd | An inclined plastics rail pad |
| GB2408281B (en) * | 2003-10-28 | 2007-04-18 | Corus Uk Ltd | Pad for a rail |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2121461B (en) | 1985-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920610 |