EP1721043A1 - Manufacture of top plate for an elastomeric rail fastening assembly - Google Patents
Manufacture of top plate for an elastomeric rail fastening assemblyInfo
- Publication number
- EP1721043A1 EP1721043A1 EP04724950A EP04724950A EP1721043A1 EP 1721043 A1 EP1721043 A1 EP 1721043A1 EP 04724950 A EP04724950 A EP 04724950A EP 04724950 A EP04724950 A EP 04724950A EP 1721043 A1 EP1721043 A1 EP 1721043A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- top plate
- well
- rail
- sockets
- fastening assembly
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000005266 casting Methods 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 abstract description 2
- 239000011162 core material Substances 0.000 description 16
- 239000013536 elastomeric material Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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
- E01B9/38—Indirect fastening of rails by using tie-plates or chairs; Fastening of rails on the tie-plates or in the chairs
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
- E01B3/16—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from steel
- E01B3/24—Slabs; Blocks; Pot sleepers; Fastening tie-rods to them
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
-
- 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
- E01B9/32—Fastening on steel sleepers with clamp members
- E01B9/34—Fastening on steel sleepers with clamp members by resilient steel clips
-
- 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
- E01B9/38—Indirect fastening of rails by using tie-plates or chairs; Fastening of rails on the tie-plates or in the chairs
- E01B9/40—Tie-plates for flat-bottom rails
-
- 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
- E01B9/38—Indirect fastening of rails by using tie-plates or chairs; Fastening of rails on the tie-plates or in the chairs
- E01B9/44—Fastening the rail on the tie-plate
Definitions
- THIS INVENTION relates to castings and is more specifically, although not exclusively, concerned with the construction of a metal casting used to provide a top plate of an elastomeric rail fastening assembly used to secure rails to the underlying bed of a railway track.
- Elastomeric rail fastening assembles are being used increasingly in situations where, for example, track noise and vibration caused by train wheels travelling along the rails, are to be lessened.
- Such an assembly comprises a top plate attached by clips to the under-flanges of the rail, a bottom plate which is securely attached to the track bed to hold the assembly in place, and a layer of an elastomeric material such as rubber usually sandwiched between frusto-conical and spaced opposed surfaces of the top plate and the bottom plate.
- the top plate is conventionally formed by an iron casting having a central well formed in its undersurface to assist retention of the casting in a mould in which it is formed, and sockets formed in the upper surface of the casting to receive the ends of respective clips which loop over bottom flanges of the rail and hold it securely in position.
- Each rail is supported by parallel lines of spaced top plates.
- the layer of elastomeric material is vulcanised to the top and bottom plates and suppresses the transmission of vibration and noise from the top plate to the bottom plate, and thus to the bed of the railway track.
- Such top plates are also useable in other devices in which a layer of elastomeric material is used to suppress the transmission of sound and vibration between two parts of the device.
- the casting of a top plate involves a moulding process in which separate cores are used to define the positions of the sockets, such cores being attached to separate seats in the mould in which the casting is formed.
- Manufacturing a top plate by the method described above results in undesirable flashing and positional variations of the sockets, and those imperfections have to be removed by dressing the casting.
- the cores used to produce the sockets may move slightly with respect to one another during the moulding process.
- flashing can occur at the ends of the sockets where the core seating extends to the mould and this must be removed to ensure that there is a clean surface free of flashing for the elastomeric layer to bond onto it and thus make an effective seal.
- the sides of the well must diverge to allow the casting to be removed from the mould. This results in a considerable thickness of the metal backing of the frusto-conical surface of the top plate. This substantially increases the weight and cost of the top plate unnecessarily.
- An object of this invention is to provide an improved top plate for an elastomeric rail fastening assembly, or similar device.
- a manufacture of a top plate for an elastomeric rail fastening assembly or similar device comprises a casting process using a single core to define a well formed in the underside of the top plate and also sockets of the casting which are to receive rail- holding clips, the core being attached to the interior wall of a mould in which the top plate is cast, by way of the mouth of the well prior to passing molten metal into the mould.
- a top plate for an elastomeric rail fastening assembly or similar device is formed by a casting process and has a well formed in the underside of the top plate communicating with sockets on the upper surface of the top plate for the reception of rail-holding clips.
- the advantage of the invention is that the use of a single core to define the sockets and the well results in the positioning of the sockets in relation to one another and to the well, being precisely defined. Also flashing on the top face of the plate is avoided so that previous problems with the bonding of the elastomeric layer to the top face of the plate are avoided without the need for subsequent dressing.
- a single core As a single core is used, it can be attached securely to the interior of the mould cavity prior to moulding, and, as the core material is readily removed after moulding the wall thickness of the casting backing the frusto-conical surface of the top plate can be made much thinner than hitherto. In consequence, a thinner wall thickness can be utilised without a loss in performance and with a consequential saving in the weight of the casting.
- the weight of the casting determines its price and the combination of the reduction in the weight of the top plate together with the reduced requirement for dressing to remove flash, results in a superior top plate which can be marketed at a cheaper price than hitherto.
- FIGURE 1 is a perspective view of an elastomeric rail fastening assembly
- FIGURE 2 is a top plan view of a top plate of the assembly
- FIGURE 3 is a vertical-section through figure 2 taken on the line and in the direction indicated by the arrows III-ITT in figure 2;
- FIGURE 4 is a vertical-section taken on the line and in the direction indicated by the arrows ⁇ V-IN in figure 2;
- FIGURE 5 is a horizontal cross-section of part of the top plate and taken on the line and in the direction indicated by the arrows Y-V in figure 3;
- FIGURE 6 is a perspective under- view of the top plate of figure 1 ;
- FIGURE 7 is a cross-section through the perspective underview of the top plate shown in figure 6 and taken on the line and in the direction of the arrows VII-VII in figure 3;
- the assembly 1 shown in figure 1 is attached to a track foundation by screw spikes (not shown) driven downwardly through apertures 2 in four anchor lugs 3 arranged in pairs at each side of a bottom plate 4 of the assembly.
- the plate 4 is made from cast iron.
- a cast iron top plate 5 is mounted centrally in an opening in the upper surface of the bottom plate 4 and is held in place by a thick layer 6 of an elastomeric material such as rubber, sandwiched between opposed and spaced frusto-conical surfaces provided respectively on the two plates 4 and 5.
- the frusto-conical surface 5 tapers downwardly.
- the layer 6 is vulcanised to both plates 4 and 5.
- a track rail 7, shown diagrammatically in broken outline, has a bottom flange 8 that locates between two spaced clip mounts 10 projecting upwards from the top plate 5 and cast integrally with it.
- Each mount 10 is formed with a horizontal and open-ended socket 11 for the reception of one end-portion of a resilient steel rail holding clip 12 shown in broken outline.
- the other end portion of the clip 12 loops around behind and then over the mount 10, and is formed with a straight horizontal terminal portion which forces the rail flange 8 downwardly against an inclined face 13 extending between the mounts 10. The inclination of the face 13 provides the required cant to the rail 7.
- Figures 2, 3 and 4 shows the top plate 5 in more detail. It is formed with a downwardly convergent hollow body 20 shown more clearly in figure 4 and which provides externally one of the opposed frusto-conical surfaces referred to earlier, and referenced 22.
- the interior of the top plate 1 contains a well 24 which extends to within twenty millimetres of the external and downwardly-tapering frusto-conical surface 22. As shown in figure 3, the cavity of the well 24 extends upwardly onto the interiors of the mounts 10 and into their open-ended sockets 11.
- the wall of the top plate 5 surrounding the sides of the well 24 is of a minimum thickness to provide the required strength without using excess metal. This reduces the cost and weight of the top plate 5. Also, the lower part of the wall provides a re-entrant lip 25 beneath the well 24 and this assists the strengthening of the wall and the location of a core used during the casting process to provide the well 24 and the sockets 11. An opening in the underside of the top plate 5 and defined by the inner edge of the lip 25, allows the core to be attached to the inside of the mould cavity during casting of the top plate 5.
- the mould in which the top plate is cast is prepared with just a single core (not shown) mounted in one face of the mould cavity by way of an opening 26 in the underside providing a mouth to the well 24.
- the core is made from a sandy material which disintegrates after casting so that it can be readily removed as a powder from the well 24 of the top plate after casting. Portions of the core project upwardly to provide the interior surfaces and sockets 11 and the mounts 10.
- the positions of the sockets 11 with respect to one another and to the well 24 are precisely defined as also is the wall thickness surrounding the well 24 and the location of the core in the mould during casting.
- the amount of metal used in the top plate is reduced without compromising its strength, and, the cost of the top plate and its weight are reduced as also is the need for extensive dressing of the casting.
- the upper surface of the top plate reflects the high finish of the wall of the mould cavity and is thus flat and smooth and can readily be vulcanised to the layer of elastomeric material located between the top and bottom plates in a manner which greatly lessens the risks of imperfections in the sealing of the elastomeric layer to the surfaces of the top and bottom plates to which it is vulcanised.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Railway Tracks (AREA)
- Connection Of Plates (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2004900994A AU2004900994A0 (en) | 2004-03-01 | Improvements in, or relating to castings | |
PCT/AU2004/000409 WO2005083178A1 (en) | 2004-03-01 | 2004-04-01 | Manufacture of top plate for an elastomeric rail fastening assembly |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1721043A1 true EP1721043A1 (en) | 2006-11-15 |
EP1721043A4 EP1721043A4 (en) | 2007-03-21 |
EP1721043B1 EP1721043B1 (en) | 2012-04-25 |
Family
ID=34891645
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04724950A Expired - Lifetime EP1721043B1 (en) | 2004-03-01 | 2004-04-01 | Manufacture of top plate for an elastomeric rail fastening assembly |
Country Status (8)
Country | Link |
---|---|
US (2) | US20070001020A1 (en) |
EP (1) | EP1721043B1 (en) |
KR (1) | KR101050577B1 (en) |
CN (1) | CN100335199C (en) |
AT (1) | ATE555252T1 (en) |
CA (1) | CA2523430C (en) |
HK (1) | HK1080027A1 (en) |
WO (1) | WO2005083178A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9702091B2 (en) | 2015-04-14 | 2017-07-11 | Pandrol Ltd. | Railroad tie plate with integral clip retainers and method of making the same |
US11680374B2 (en) | 2020-01-03 | 2023-06-20 | Progress Rail Services Corporation | Direct fixation fastener assembly for track rail having molded support block and method of making same |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009041833B4 (en) * | 2009-09-18 | 2011-06-22 | Vossloh-Werke GmbH, 58791 | Shim for fixing a rail to a solid surface and fixing a rail |
ES2669552T3 (en) | 2011-05-25 | 2018-05-28 | Intercast & Forge Pty Limited | A rail support plate |
EA034177B1 (en) * | 2018-03-22 | 2020-01-15 | Павел Михайлович Вилюха | Rail fastening block |
EP3762543A4 (en) * | 2018-04-11 | 2021-12-15 | Specter Innovations Group Pty Ltd | Vehicle rail mounting device |
RU196901U1 (en) * | 2020-01-16 | 2020-03-19 | Леонид Михайлович Попко | Rail fastener |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE621003C (en) * | 1935-10-31 | Charles Robert Mayo | Single threshold made of metal | |
US4203549A (en) * | 1977-04-07 | 1980-05-20 | Sandford Geoffrey P | Railway sleeper |
FR2561274A1 (en) * | 1984-03-13 | 1985-09-20 | Rueil Fonderies | Support for a rail particularly of a railway track. |
JP2002004202A (en) * | 2000-06-22 | 2002-01-09 | Kubota Corp | Sleeper |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US972303A (en) * | 1910-03-31 | 1910-10-11 | Heye J Wessels | Railway-tie. |
USRE32894E (en) * | 1977-06-09 | 1989-03-28 | Pandrol Limited | Railway tie plate and a method of making a railway tie plate |
FR2411655A1 (en) * | 1977-12-14 | 1979-07-13 | Creusot Loire | IMPROVEMENT IN MOLDING OF CROSSING HEARTS |
US4609030A (en) * | 1985-12-06 | 1986-09-02 | Ford Motor Company | Method of increasing productivity of casting vee configuration engine blocks in a given mold |
US4734967A (en) * | 1986-06-02 | 1988-04-05 | Imperial Clevite Inc. | Method of heat treating bearing materials |
US5201811A (en) * | 1992-01-28 | 1993-04-13 | The Hamilton Foundry & Machine Co. | Method and apparatus for the manufacture of unitary complex cores |
BR9200416A (en) * | 1992-02-03 | 1993-08-10 | Dernis Antonio Fernandes Morei | METALIC SLEEP |
US5481986A (en) * | 1994-11-09 | 1996-01-09 | Amsted Industries Incoporated | Lightweight truck sideframe |
KR100268160B1 (en) * | 1998-05-08 | 2000-10-16 | 조봉종 | A device for fastening rail of rail way |
KR100329814B1 (en) * | 1999-07-06 | 2002-03-25 | 이영제 | Trackwork Fasteners |
KR20010092132A (en) * | 2000-03-20 | 2001-10-24 | 김상균 | System for finance transactions using a biometrics information |
CN2499434Y (en) * | 2001-09-06 | 2002-07-10 | 严成章 | Elastic press plate for crane rail |
CN2534221Y (en) * | 2001-10-31 | 2003-02-05 | 锦州铁路分局山海关线桥工程段 | Adjustable gauge cut-out fastening |
-
2004
- 2004-04-01 AT AT04724950T patent/ATE555252T1/en active
- 2004-04-01 CA CA2523430A patent/CA2523430C/en not_active Expired - Fee Related
- 2004-04-01 US US10/555,482 patent/US20070001020A1/en not_active Abandoned
- 2004-04-01 WO PCT/AU2004/000409 patent/WO2005083178A1/en not_active Application Discontinuation
- 2004-04-01 CN CNB2004800000190A patent/CN100335199C/en not_active Expired - Fee Related
- 2004-04-01 EP EP04724950A patent/EP1721043B1/en not_active Expired - Lifetime
- 2004-04-01 KR KR1020057019819A patent/KR101050577B1/en active IP Right Grant
-
2006
- 2006-01-04 HK HK06100093A patent/HK1080027A1/en not_active IP Right Cessation
-
2009
- 2009-05-20 US US12/469,417 patent/US20100126689A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE621003C (en) * | 1935-10-31 | Charles Robert Mayo | Single threshold made of metal | |
US4203549A (en) * | 1977-04-07 | 1980-05-20 | Sandford Geoffrey P | Railway sleeper |
FR2561274A1 (en) * | 1984-03-13 | 1985-09-20 | Rueil Fonderies | Support for a rail particularly of a railway track. |
JP2002004202A (en) * | 2000-06-22 | 2002-01-09 | Kubota Corp | Sleeper |
Non-Patent Citations (1)
Title |
---|
See also references of WO2005083178A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9702091B2 (en) | 2015-04-14 | 2017-07-11 | Pandrol Ltd. | Railroad tie plate with integral clip retainers and method of making the same |
US11680374B2 (en) | 2020-01-03 | 2023-06-20 | Progress Rail Services Corporation | Direct fixation fastener assembly for track rail having molded support block and method of making same |
Also Published As
Publication number | Publication date |
---|---|
ATE555252T1 (en) | 2012-05-15 |
KR101050577B1 (en) | 2011-07-19 |
HK1080027A1 (en) | 2006-04-21 |
EP1721043A4 (en) | 2007-03-21 |
US20100126689A1 (en) | 2010-05-27 |
CN1697712A (en) | 2005-11-16 |
WO2005083178A1 (en) | 2005-09-09 |
CA2523430C (en) | 2012-05-15 |
KR20060123032A (en) | 2006-12-01 |
US20070001020A1 (en) | 2007-01-04 |
EP1721043B1 (en) | 2012-04-25 |
CA2523430A1 (en) | 2005-09-09 |
CN100335199C (en) | 2007-09-05 |
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