EP3279397B1 - Fixation of a rail to a tie plate by means of cylindrical clamping bolts - Google Patents
Fixation of a rail to a tie plate by means of cylindrical clamping bolts Download PDFInfo
- Publication number
- EP3279397B1 EP3279397B1 EP16183038.5A EP16183038A EP3279397B1 EP 3279397 B1 EP3279397 B1 EP 3279397B1 EP 16183038 A EP16183038 A EP 16183038A EP 3279397 B1 EP3279397 B1 EP 3279397B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rail
- baseplate
- fastening
- fastening element
- aperture
- 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.)
- Active
Links
- 241001669679 Eleotris Species 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 description 7
- 239000004567 concrete Substances 0.000 description 5
- 239000004035 construction material Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- -1 tarmac Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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
- E01B9/44—Fastening the rail on the tie-plate
- E01B9/50—Fastening the rail on the tie-plate by keys
-
- 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
- E01B9/46—Fastening the rail on the tie-plate by clamps
- E01B9/48—Fastening the rail on the tie-plate by clamps by resilient steel clips
- E01B9/483—Fastening the rail on the tie-plate by clamps by resilient steel clips the clip being a shaped bar
Definitions
- the invention relates to a device and a method for fastening a rail to a structure.
- the device and method of this type are used for fastening railroad rails, tram rails or similar to structures, such as sleepers (also called ties or crossties) or a road ground structure.
- railroad rails comprise a foot, a web and a head.
- a device of the intended type comprises a baseplate to be fixed to the structure and for supporting the rail, and a fastening element for clamping the foot of the rail to the baseplate.
- fastening devices for fastening railroad rail to sleepers and other types of structures in the prior art.
- One such type of fastening devices comprises a baseplate and a fastening element, wherein the baseplate is arranged for supporting the rail and wherein the fastening element is arranged for clamping the rail to the baseplate.
- the baseplate comprises a support with an aperture for receiving the fastening element, so that an end portion can be inserted into the aperture.
- the fastening element is elongated and can have rectangular cross section. Also the support and the aperture therein can have a rectangular shape corresponding to the fastening element.
- fastening elements having substantially circular cross section which are used for fastening flat-bottomed rails to sleepers.
- An object of the present invention is to avoid the problems of the prior art and further improve devices for fastening a railroad rail to a structure.
- the device according to the invention is inexpensive to manufacture and results in fast and easy installation of the rail. Further, the device according to the invention results in a durable fastening which can withstand heavy loads without breaking. Also, the device according to the present invention results in a low profile fastening, which results in less obstruction during operations on a railroad track, such as machine operated snow clearance and other types of maintenance operations. Further, the low profile fastening device of the present invention results in reduced damages on a pavement layer, such as asphalt, tarmac, concrete or similar arranged to cover the structure and a lower part of the rail.
- the present invention defines in claim 1 a rail fastening device for fastening a rail to a structure, comprising a baseplate and a fastening element, wherein the baseplate is arranged to be fixed to the structure and comprises a top side having a rail supporting portion and a support with a through aperture for receiving the fastening element, wherein the fastening element is elongated, comprises a bottom portion, a top portion, a first end portion, a second end portion, an intermediate portion and a centre axis and is arranged to extend through the aperture and partly overlap a foot of the rail for fastening of the rail to the baseplate, wherein the aperture is arranged to face the rail when the rail is supported by the rail supporting portion of the baseplate, that the first end portion of the fastening element is arranged to be inserted through the aperture and overlap the foot of the rail, that the first and second end portions of the fastening element are formed with a chamfer, and that the fastening element is
- the chamfers and the curvature of the fastening element in combination with the aperture of the baseplate facing the rail or at least partially being arranged in a direction towards the web of the rail when the rail is supported by the rail supporting portion results in an efficient and easy fastening of the rail and an inexpensive fastening device. Further, compared to certain types of prior art fastening devices the fastening device of the present invention is more durable and can withstand higher stress without breaking.
- the chamfer can comprise an inner bevel portion being less steep than the remaining outer portion of the chamfer. Hence, the fastening device is even more easy to insert through the aperture and brought to overlap the foot of the rail.
- the fastening element or at least the intermediate portion thereof is arranged with a substantially circular cross section.
- the fastening element is inexpensive and easy to manufacture.
- the fastening element can be manufactured from rods of hardened steel or similar inexpensive commodity materials.
- the present invention describes further in claim 8 a method for fastening a rail to a structure by means of a baseplate and an elongated fastening element.
- a device 10 for fastening a rail 11 to a structure 12 is illustrated schematically according to one embodiment.
- the rail 11 is a conventional railroad rail comprising a head 13, a web 14 and a foot 15.
- the rail 11 is a flat-bottom rail, such as a Vignoles rail or similar.
- the structure 12 is a sleeper, such as a sleeper of wood, concrete, steel, plastic material or rubber materials.
- the structure 11 is a road ground structure, such as a road underlayer, including concrete, tarmac, asphalt and similar structures.
- the device 10 comprises a baseplate 16 and a fastening element 17, wherein the baseplate 16 is arranged for supporting a part of the rail 11, and wherein the fastening element 17 is arranged for fastening the rail 11 to the baseplate 16.
- the baseplate 16 is fixed to the structure 12, e.g. by means of conventional fasteners, such as rail screws 18.
- the baseplate 16 is fixed to a structure 12 in the form of a sleeper by means of rail screws 18 being screwed into holes bored in the sleeper.
- the baseplate 16 is arranged in metal, such as steel, hardened steel or similar.
- the baseplate 16 comprises a top side 19 having a rail supporting portion 20 for supporting the rail 11.
- the rail 11 is supported by the rail supporting portion 20 directly or indirectly, such as through an elastic plate or similar in a conventional manner.
- the rail supporting portion 20 is defined by optional and conventional baseplate shoulders 21, wherein the rail 11 is arranged between the shoulders 21.
- the baseplate 16 comprises only one shoulder 21 or no shoulders.
- the baseplate 16 comprises at least one support 22 having a through aperture 23.
- the support 22 is formed as a loop.
- the baseplate 16 comprises two supports 22 arranged on opposite sides of the rail supporting portion 20, wherein the rail supporting portion 20 is arranged between the supports 22.
- the shoulders 21 are arranged between the supports 22.
- the supports 22 project from the top side 19 of the baseplate 16, so that the supports 22 projects above the rail supporting portion 20.
- the supports 22 project perpendicular to a plane of the rail supporting portion 20. Hence, the supports 22 project in a vertical direction when the rails 11 run horizontally. For example, the supports 22 project in the same direction as the shoulders 21.
- the aperture 23 is arranged above the rail supporting portion 20.
- the aperture 23 is arranged at least partially above the foot 15 of the rail 11.
- the aperture 23 extends in a direction towards the rail 11 when the rail 11 is supported by the rail supporting portion 20.
- the apertures 23 of the supports 22 face each other.
- the aperture 23 is straight, i.e. having a straight centre line, wherein the centre line extends substantially perpendicular to a longitudinal direction of the rail 11.
- the aperture 23 extends through the support 22 in a direction in parallel to the width of the foot 15 of the rail 11.
- the aperture 23 is arranged for receiving the fastening element 17, so that the fastening element 17 is insertable into and partly through the aperture 23 for fastening the rail 11 to the baseplate 16.
- the fastening element 17 is arranged to extend through the aperture 23 and partly overlap the foot 15 of the rail 11 for fastening of the rail 11 to the baseplate 16.
- the fastening element 16 is arranged to clamp the rail 11 to the baseplate 16 by a wedging function.
- fastening element 17 is brought into the aperture 23 and into contact with the foot 15 of the rail and into contact with the baseplate 16 to force the foot 15 of the rail 11 towards the rail supporting surface 20 and prevent displacement of the rail 11 in relation to the baseplate 16.
- fastening elements 17 are arranged through the apertures 23 of each of the supports 22, wherein fastening elements 17 are engaging top surfaces of the foot 15 on opposite sides of the web 14 of the rail 11.
- a first fastening element 17 is arranged through the aperture 23 of a first support 22, wherein a separate second fastening element 17 is arranged through the aperture of a second support 22, the first and second supports being arranged on opposite sides of the rail supporting portion 20 on the top side 19 of the baseplate 16.
- the device 10 is arranged for fastening a rail 11 in the form of a grooved tram rail to a structure 12, such as a sleeper or similar supporting structure.
- the device 10 comprises the baseplate 16 and the one or more fastening elements 17 as described with reference to Figs. 1-3 , wherein the baseplate 16 is fixed to the structure 12 by means of fasteners, such as conventional rail screws 18, and wherein the fastening elements 17 are arranged through the apertures 23 in the supports 22 to force the foot 15 of the rail 11 to the rail supporting portion 20 of the baseplate 16.
- the structure 12, the device 10 and the foot 15 of the rail 11 are covered with a road construction material 24 forming a road surface or pavement, which is illustrated schematically in Fig. 4 .
- the road construction material 24 is arranged to the upper edges of the grooved head 13 of the rail 11.
- the device 10 is arranged for fastening a rail 11 in the form of a grooved tram rail to a structure 12, such as a supporting structure of concrete or similar solidifying materials.
- the device 10 comprises the baseplate 16 and the one or more fastening elements 17, wherein the top side 19 of the baseplate 16 is arranged as described with reference to Figs. 1-3 , and wherein the baseplate 16 further comprises an anchor 25 to be received in the structure 12 before it solidifies, so that the anchor 25 is moulded into the structure 12 for fastening the baseplate 16 to the structure 12.
- a road construction material 24 forming a road surface or pavement, as described with reference to Fig. 4 is covering the device 10, and is arranged substantially up to the upper edges of the rail 11.
- the device 10 is arranged for fastening a rail 11 in the form of a grooved tram rail to a structure 12, such as a supporting structure of concrete or similar solidifying materials as described with reference to Figs 6 and 7 , wherein the baseplate 16 comprises or is provided with the anchor 25.
- the top side 19 of the baseplate 16 is arranged without the shoulders 21.
- the rail supporting portion 20 of the baseplate 16 is defined by the supports 22.
- the baseplate 16 is illustrated according to one embodiment.
- the baseplate 16 according to Figs. 10-13 comprises the rail supporting portion 20 and the one or more supports 22.
- the baseplate 16 comprises two opposite supports 22 with the apertures 23 facing each other.
- the supports 22 are displaced in relation to each other, e.g. in a direction along the rail 11, wherein the apertures 23, at least partially, are directed towards the rail supporting portion 20 so that the part of the fastening element 17 driven through the aperture 23 overlaps the foot 15 of the rail 11.
- the apertures 23 at least partially faces the rail 11 when the rail 11 is arranged on the rail supporting portion 20 of the baseplate 16.
- the apertures 23 extend through the supports 22 in a direction substantially perpendicular to the longitudinal direction of the rail 11.
- the baseplate 16 comprises a single support 22.
- the baseplate 16 is arranged with through holes 26 for receiving the fasteners, such as the rail screws 18.
- the baseplate 16 is substantially rectangular, seen from above as illustrated in Fig. 11 , and provided with rounded corners.
- the baseplate 16 has long sides to be arranged substantially perpendicular to the longitudinal direction of the rail 11, wherein the apertures 23, e.g. extend through the supports 22 in a direction in parallel to said long sides.
- the baseplate 16 is moulded in a single piece.
- the baseplate 16 is comprises one or more elevated portions 27 for supporting a part of the fastening element 17.
- the baseplate 16 comprises two elevated portions 27 arranged on the top side 19 of the baseplate 16 on opposite sides of the rail supporting portion 20.
- the elevated portions 27 are arranged adjacent to the supports 22.
- the support 22 is arranged between the elevated portion 27 and the rail supporting portion 20.
- the supports 22 are arranged between the elevated portions 27.
- the elevated portions 27 are elevated 6-10 mm, such as around 8 mm.
- the support 22 is formed with the aperture 23 to provide a material thickness T around the aperture 23.
- the material thickness T is, for example, 8-20 mm, 10-14 mm or 12 mm.
- the support 22 is formed as an arch, wherein the aperture 23 at least has a rounded upper portion having a radius RA of, for example, 6-20 mm 8-16 mm or 10-12 mm.
- the radius RA of the rounded upper portion of the aperture 23 is 10 mm.
- the baseplate 16 is, for example, arranged with a thickness of 10-20 mm or about 15 mm.
- the fastening element 17 comprises a bottom portion, a top portion, a first end portion 28, an opposite second end portion 29, an intermediate portion 30 and a centre axis A and is arranged to extend through the aperture 23 and overlap the foot 15 of the rail 11 for fastening of the rail 11 to the baseplate 16.
- the intermediate portion 30 is arranged between the first and second end portions 28, 29.
- the first end portion 28 is arranged to be inserted through the aperture 23 and overlap the foot 15 of the rail 11.
- the first end portion 28 is arranged to be inserted into the aperture 23 from the outer side thereof and brought through the entire aperture 23 to a position in which the first end portion 28 projects from the inner side of the aperture 23 and engages the foot 15 of the rail 11, while the second end portion 29 engages the baseplate 16.
- the second end portion 29 then projects from the outer side of the aperture 23.
- the fastening element 17 is substantially cylindrical, e.g. at least partially having a substantially circular cross section.
- at least the intermediate portion 30 has a circular cross section.
- the first and second end portions 28, 29 are similar.
- the first and second end portions 28, 29 of the fastening element 17 are formed with a chamfer 31.
- the chamfers 31 are arranged in the bottom portion of the fastening element 17, so that the chamfers 31 are arranged downwards when the fastening element 17 is arranged through the aperture 23.
- the chamfer 31 of the first end portion 28 is arranged for engaging or facing the foot 15 of the rail 11, wherein the chamfer 31 of the second end portion 29 is arranged for engaging or facing the baseplate 16, such as the elevated portion 27 thereof.
- the chamfer 31 is arranged with a length C of 2-10 mm, 4-8 mm or about 6 mm, which is illustrated in Fig. 16 .
- the chamfer 31 of the fastening element 17 comprises an inner bevel portion 32 being less steep than the remaining part of the chamfer 31.
- the bevel portion 32 is arranged between the remaining outer part of the chamfer 31 and the intermediate portion 30 of the fastening element 17.
- the bevel portion 32 extends into the intermediate portion 30.
- both chamfers 31 comprise the bevel portions 32, wherein the bevel portions 32 are arranged in the bottom portion of the fastening element 17.
- the bevel portion 32 of the first end portion 28 is arranged for engaging the foot 15 of the rail 11, wherein the bevel portion 32 of the second end portion 29 is arranged for engaging the baseplate 16, such as the elevated portion 27 thereof.
- the bevel portion 32 is, e.g.
- the outer part of the chamfer 31 is arranged with an angle in relation to the bevel portion 32 and the length C to provide a difference G of about 1 mm between the outer edge of the chamfer 31 and the outer edge of the bevel portion 32.
- the chamfer 31 is arranged without the bevel portion 32 and is, e.g. arranged with constant or varying inclination.
- the fastening element 17 is arranged with a curvature.
- the curvature is arranged so that the end portions 28, 29 are bent slightly upwards in relation to the intermediate portion 30 when the fastening element 17 is arranged horizontally with the chamfer 31 facing downwards.
- the curvature is arranged so that the first end portion 28 is arranged above the intermediate portion 30 when the rail 11 is secured to the baseplate 16 by means of the fastening element 17.
- at least the intermediate portion 30 is arranged with the curvature, wherein the centre axis A of the intermediate portion 30 is formed with a curvature having a radius RC.
- the entire fastening element 17 is arranged with said curvature.
- the intermediate portion 30 extends between central parts of the bevel portions 32 as illustrated by means of the length I in in Fig. 16 .
- the intermediate portion 30 extends to the outer edge of the bevel portions 32 or to the inner edge of the bevel portions 32.
- the radius RC of the curvature is 400-600 mm or around 500 mm.
- the length I of the intermediate portion 30 is 50-100 mm, 60-90 mm, 70-80 mm or around 75 mm.
- the centre line A is curved at the end portions 28, 29 in relation to the intermediate portion 30 and in the opposite direction as the curvature of the intermediate portion 30, which is indicated by means of the radius RE in Fig. 16 .
- the radius RE is 100-300 mm, 150-250 mm or about 200 mm.
- the length and curvature of the fastening element 17 is arranged so that a deviation from a straight line between the end and the mid parts of the fastening element is 1-3 mm or about 2 mm as indicate by means of the arrows K in Fig. 16 .
- the fastening element 17 is arranged with a total length F of 80-120 mm, 100-110 mm or about 105 mm.
- the fastening element 17 is arranged with a diameter D of 16-20 mm or about 18 mm, except at the chamfers 31, optionally with the bevel portions 32.
- FIG. 18 fixing of a rail 11 to the structure 12 in the form of a sleeper is illustrated schematically according to one embodiment.
- the baseplate 16 is fixed to the structure 12 by means of fastening means.
- holes 33 are arranged in the structure 12 for receiving fastening means in the form of rail screws 18.
- the baseplate 16 is arranged on a top surface of the structure 12 and is fixed to the structure 12 by means of the rail screws 18, which are screwed through the holes 26 in the baseplate 16 and into the holes 33 in the structure 12, which is illustrated by means of the arrows M in Fig. 18 .
- the rail 11 is arranged on the rail supporting portion 20 of the baseplate 16.
- the rail 11 is arranged between the shoulders 21 and between the supports 22 with the apertures 23, which is illustrated schematically by means of the arrow N in Fig. 19 , wherein the rail 11 is supported, either directly or indirectly, by the top side 19 of the baseplate 16.
- an elastomeric plate or similar is arranged between the rail supporting portion 20 and the rail 11.
- the fastening elements 17 are introduced into the aperture 23, which is illustrated by means of the arrows O and P in Fig. 20 .
- the rail screws 18 are not illustrated.
- the first end portion 28 is brought into the aperture 23 from the outer side thereof and is brought through the aperture 23 and out from the inner side thereof, i.e. the side facing the rail 11.
- the fastening element 17 is forced towards the rail 11 by means of a tool for applying force on the second end portion 29 in a direction substantially along the centre axis A of the fastening element 17.
- the fastening element 17 is forced in a direction substantially perpendicular to the longitudinal direction of the rail 11.
- the first end portion 28 is brought to engage the foot 15 of the rail 11, wherein a top portion of the intermediate portion 30 is brought against the inner top surface of the support 22 inside the aperture 23 and the second end portion 29 is brought to engage the baseplate 16, such as the elevated portion 27, so that the fastening element 17 is wedged towards the foot 15 of the rail 11 through the aperture 23 in the support 22 and the second end portion abutting the baseplate 16.
- the fastening elements 17 are brought towards the web 14 of the rail 11 in opposite directions, such as towards each other to engage the foot 15 of the rail 11 on opposite sides of the web 14.
- the fastening element 17 is efficiently wedged to the rail 11 and the baseplate 16 by means of the design of the fastening element 17 and the baseplate 16, including the curvature and the chamfers 31, 32 of the fastening element 17.
- the chamfer 31 of the first end portion 28 is brought into engagement with the foot 15 of the rail 11, wherein the chamfer 31 of the second end portion 29 is brought into engagement with the top side 19 of the baseplate 16 or the elevated portion 27 while the concavely curved top portion of the intermediate portion 30 is brought against the support 22 inside the aperture 23.
- the bevel portions 32 of the chamfers 31 are brought into contact with the foot 15 of the rail 11 and the top side of the baseplate 16 or the elevated portion 27 thereof, respectively. Then, optionally the construction material 24 is arranged on top of the baseplate 16, which is illustrated in Fig. 21 .
Description
- The invention relates to a device and a method for fastening a rail to a structure. The device and method of this type are used for fastening railroad rails, tram rails or similar to structures, such as sleepers (also called ties or crossties) or a road ground structure. Generally, railroad rails comprise a foot, a web and a head. A device of the intended type comprises a baseplate to be fixed to the structure and for supporting the rail, and a fastening element for clamping the foot of the rail to the baseplate.
- There are several different types of devices for fastening railroad rail to sleepers and other types of structures in the prior art. One such type of fastening devices comprises a baseplate and a fastening element, wherein the baseplate is arranged for supporting the rail and wherein the fastening element is arranged for clamping the rail to the baseplate. The baseplate comprises a support with an aperture for receiving the fastening element, so that an end portion can be inserted into the aperture. The fastening element is elongated and can have rectangular cross section. Also the support and the aperture therein can have a rectangular shape corresponding to the fastening element. Known is also different types of fastening elements having substantially circular cross section which are used for fastening flat-bottomed rails to sleepers.
- One problem with certain types of prior art devices for fastening rail to a structure is that they are difficult to use.
- Another problem with certain types of such prior art devices is that they cannot withstand substantial loads and break relatively easy.
- Another problem with prior art devices for fastening rail to a structure is that they are expensive to manufacture.
- Yet another problem with certain types of prior art devices for fastening rail to a structure is that they can obstruct operations for maintenance along a railroad track.
- Yet another problem with certain types of prior art devices for fastening rail to a structure is that they can cause damages on a pavement layer, such as an asphalt or tarmac layer, covering the underlying structure a part of the rail.
- Customary fastening devices are described in
US 1 379 531 A ,US 2 645 427 A andWO 2006/106089 A2 , whereinUS 1 379 531 A discloses a fastening device according to the preamble of the present claim 1. - An object of the present invention is to avoid the problems of the prior art and further improve devices for fastening a railroad rail to a structure. The device according to the invention is inexpensive to manufacture and results in fast and easy installation of the rail. Further, the device according to the invention results in a durable fastening which can withstand heavy loads without breaking. Also, the device according to the present invention results in a low profile fastening, which results in less obstruction during operations on a railroad track, such as machine operated snow clearance and other types of maintenance operations. Further, the low profile fastening device of the present invention results in reduced damages on a pavement layer, such as asphalt, tarmac, concrete or similar arranged to cover the structure and a lower part of the rail.
- For solving the above-mentioned object, the present invention defines in claim 1 a rail fastening device for fastening a rail to a structure, comprising a baseplate and a fastening element, wherein the baseplate is arranged to be fixed to the structure and comprises a top side having a rail supporting portion and a support with a through aperture for receiving the fastening element, wherein the fastening element is elongated, comprises a bottom portion, a top portion, a first end portion, a second end portion, an intermediate portion and a centre axis and is arranged to extend through the aperture and partly overlap a foot of the rail for fastening of the rail to the baseplate, wherein the aperture is arranged to face the rail when the rail is supported by the rail supporting portion of the baseplate, that the first end portion of the fastening element is arranged to be inserted through the aperture and overlap the foot of the rail, that the first and second end portions of the fastening element are formed with a chamfer, and that the fastening element is arranged with a curvature, wherein the bottom portion of the intermediate portion of the fastening element is convex. The chamfers and the curvature of the fastening element in combination with the aperture of the baseplate facing the rail or at least partially being arranged in a direction towards the web of the rail when the rail is supported by the rail supporting portion results in an efficient and easy fastening of the rail and an inexpensive fastening device. Further, compared to certain types of prior art fastening devices the fastening device of the present invention is more durable and can withstand higher stress without breaking.
- The chamfer can comprise an inner bevel portion being less steep than the remaining outer portion of the chamfer. Hence, the fastening device is even more easy to insert through the aperture and brought to overlap the foot of the rail.
- The fastening element or at least the intermediate portion thereof is arranged with a substantially circular cross section. Hence, the fastening element is inexpensive and easy to manufacture. For example, the fastening element can be manufactured from rods of hardened steel or similar inexpensive commodity materials.
- For solving the above-mentioned object, the present invention describes further in claim 8 a method for fastening a rail to a structure by means of a baseplate and an elongated fastening element.
- Further characteristics and advantages of the present invention will become apparent from the description of the embodiments below, the appended drawings and the dependent claims.
- The invention will now be described more in detail with the aid of embodiments and with reference to the appended drawings, in which
-
Fig. 1 is a schematic perspective view obliquely from above and partly in section of a part of a flat-bottom rail being fastened to a structure in the form of a sleeper by means of a device according to one embodiment, -
Fig. 2 is a schematic front view, partly in section, of the device fixing the part of the rail to the sleeper according toFig. 1 , -
Fig. 3 is a schematic view from above of the device, the part of the rail and the sleeper according toFig. 1 , -
Fig. 4 is a schematic front view, partly in section, of a device fastening a grooved tram rail to a structure according to one embodiment, -
Fig. 5 is a schematic view from above of the device, the part of the rail and the sleeper according toFig. 4 , -
Fig. 6 is a schematic front view, partly in section, of a device fastening a grooved tram rail to a structure according to an alternative embodiment, -
Fig. 7 is a schematic view from above of the device, the part of the rail and the sleeper according toFig. 6 , -
Fig. 8 is a schematic front view, partly in section, of a device fastening a grooved tram rail to a structure according to a further alternative embodiment, -
Fig. 9 is a schematic view from above of the device, the part of the rail and the sleeper according toFig. 8 , -
Fig. 10 is a schematic perspective view obliquely from above of a baseplate of the device according to one embodiment of the invention, -
Fig. 11 is a schematic top view of the baseplate according toFig. 10 , -
Fig. 12 is a schematic side view of the baseplate according to embodiment, illustrating a support and an aperture of the baseplate, -
Fig. 13 is a schematic front view of the baseplate according to one embodiment, -
Fig. 14 is a schematic perspective view obliquely from below of a fastening element of the device according to one embodiment, -
Fig. 15 is a schematic end view of the fastening device according to one embodiment, -
Fig. 16 is a schematic side view of the fastening device according to one embodiment, illustrating a curvature of the fastening device, -
Fig. 17 is a schematic bottom view of the fastening device according to one embodiment, illustrating a chamfer at the end portions thereof, and -
Figs. 18-21 is a series of figures schematically illustrating fastening of a rail to a structure by means of the device according to one embodiment. - With reference to
Figs. 1-3 adevice 10 for fastening arail 11 to astructure 12 is illustrated schematically according to one embodiment. In the drawings a part of therail 11 and a part of thestructure 12 are illustrated schematically. In the embodiment ofFigs. 1-3 therail 11 is a conventional railroad rail comprising ahead 13, aweb 14 and afoot 15. For example, therail 11 is a flat-bottom rail, such as a Vignoles rail or similar. For example, thestructure 12 is a sleeper, such as a sleeper of wood, concrete, steel, plastic material or rubber materials. Alternatively, thestructure 11 is a road ground structure, such as a road underlayer, including concrete, tarmac, asphalt and similar structures. - The
device 10 comprises abaseplate 16 and afastening element 17, wherein thebaseplate 16 is arranged for supporting a part of therail 11, and wherein thefastening element 17 is arranged for fastening therail 11 to thebaseplate 16. Thebaseplate 16 is fixed to thestructure 12, e.g. by means of conventional fasteners, such asrail screws 18. For example, thebaseplate 16 is fixed to astructure 12 in the form of a sleeper by means ofrail screws 18 being screwed into holes bored in the sleeper. For example, thebaseplate 16 is arranged in metal, such as steel, hardened steel or similar. Thebaseplate 16 comprises atop side 19 having arail supporting portion 20 for supporting therail 11. Therail 11 is supported by therail supporting portion 20 directly or indirectly, such as through an elastic plate or similar in a conventional manner. In the illustrated embodiment, therail supporting portion 20 is defined by optional and conventional baseplate shoulders 21, wherein therail 11 is arranged between theshoulders 21. Alternatively, thebaseplate 16 comprises only oneshoulder 21 or no shoulders. Thebaseplate 16 comprises at least onesupport 22 having a throughaperture 23. For example, thesupport 22 is formed as a loop. In the illustrated embodiment thebaseplate 16 comprises twosupports 22 arranged on opposite sides of therail supporting portion 20, wherein therail supporting portion 20 is arranged between thesupports 22. In the illustrated embodiment theshoulders 21 are arranged between thesupports 22. The supports 22 project from thetop side 19 of thebaseplate 16, so that thesupports 22 projects above therail supporting portion 20. For example, thesupports 22 project perpendicular to a plane of therail supporting portion 20. Hence, thesupports 22 project in a vertical direction when therails 11 run horizontally. For example, thesupports 22 project in the same direction as theshoulders 21. Theaperture 23 is arranged above therail supporting portion 20. For example, theaperture 23 is arranged at least partially above thefoot 15 of therail 11. Theaperture 23 extends in a direction towards therail 11 when therail 11 is supported by therail supporting portion 20. For example, theapertures 23 of thesupports 22 face each other. For example, theaperture 23 is straight, i.e. having a straight centre line, wherein the centre line extends substantially perpendicular to a longitudinal direction of therail 11. Hence, theaperture 23 extends through thesupport 22 in a direction in parallel to the width of thefoot 15 of therail 11. Theaperture 23 is arranged for receiving thefastening element 17, so that thefastening element 17 is insertable into and partly through theaperture 23 for fastening therail 11 to thebaseplate 16. Thefastening element 17 is arranged to extend through theaperture 23 and partly overlap thefoot 15 of therail 11 for fastening of therail 11 to thebaseplate 16. For example, thefastening element 16 is arranged to clamp therail 11 to thebaseplate 16 by a wedging function. Hence, thefastening element 17 is brought into theaperture 23 and into contact with thefoot 15 of the rail and into contact with thebaseplate 16 to force thefoot 15 of therail 11 towards therail supporting surface 20 and prevent displacement of therail 11 in relation to thebaseplate 16. As illustrated in thedrawings fastening elements 17 are arranged through theapertures 23 of each of thesupports 22, whereinfastening elements 17 are engaging top surfaces of thefoot 15 on opposite sides of theweb 14 of therail 11. Hence, afirst fastening element 17 is arranged through theaperture 23 of afirst support 22, wherein a separatesecond fastening element 17 is arranged through the aperture of asecond support 22, the first and second supports being arranged on opposite sides of therail supporting portion 20 on thetop side 19 of thebaseplate 16. - With reference to
Figs. 4 and 5 thedevice 10 is arranged for fastening arail 11 in the form of a grooved tram rail to astructure 12, such as a sleeper or similar supporting structure. Thedevice 10 comprises thebaseplate 16 and the one ormore fastening elements 17 as described with reference toFigs. 1-3 , wherein thebaseplate 16 is fixed to thestructure 12 by means of fasteners, such as conventional rail screws 18, and wherein thefastening elements 17 are arranged through theapertures 23 in thesupports 22 to force thefoot 15 of therail 11 to therail supporting portion 20 of thebaseplate 16. For example, thestructure 12, thedevice 10 and thefoot 15 of therail 11 are covered with aroad construction material 24 forming a road surface or pavement, which is illustrated schematically inFig. 4 . For example, theroad construction material 24 is arranged to the upper edges of thegrooved head 13 of therail 11. - With reference to
Figs. 6 and 7 thedevice 10 is arranged for fastening arail 11 in the form of a grooved tram rail to astructure 12, such as a supporting structure of concrete or similar solidifying materials. Thedevice 10 comprises thebaseplate 16 and the one ormore fastening elements 17, wherein thetop side 19 of thebaseplate 16 is arranged as described with reference toFigs. 1-3 , and wherein thebaseplate 16 further comprises ananchor 25 to be received in thestructure 12 before it solidifies, so that theanchor 25 is moulded into thestructure 12 for fastening thebaseplate 16 to thestructure 12. In the embodiment ofFigs. 6 and 7 thefastening elements 17 are arranged through theapertures 23 in thesupports 22 to force thefoot 15 of therail 11 to therail supporting portion 20 of thebaseplate 16 as described above. Optionally, aroad construction material 24 forming a road surface or pavement, as described with reference toFig. 4 is covering thedevice 10, and is arranged substantially up to the upper edges of therail 11. - With reference to
Figs. 8 and 9 thedevice 10 is arranged for fastening arail 11 in the form of a grooved tram rail to astructure 12, such as a supporting structure of concrete or similar solidifying materials as described with reference toFigs 6 and 7 , wherein thebaseplate 16 comprises or is provided with theanchor 25. However, thetop side 19 of thebaseplate 16 is arranged without theshoulders 21. For example, therail supporting portion 20 of thebaseplate 16 is defined by thesupports 22. - With reference to
Figs. 10-13 thebaseplate 16 is illustrated according to one embodiment. Thebaseplate 16 according toFigs. 10-13 comprises therail supporting portion 20 and the one or more supports 22. In the embodiment ofFigs. 10-13 thebaseplate 16 comprises twoopposite supports 22 with theapertures 23 facing each other. Alternatively, thesupports 22 are displaced in relation to each other, e.g. in a direction along therail 11, wherein theapertures 23, at least partially, are directed towards therail supporting portion 20 so that the part of thefastening element 17 driven through theaperture 23 overlaps thefoot 15 of therail 11. Hence, theapertures 23 at least partially faces therail 11 when therail 11 is arranged on therail supporting portion 20 of thebaseplate 16. For example, theapertures 23 extend through thesupports 22 in a direction substantially perpendicular to the longitudinal direction of therail 11. Alternatively, thebaseplate 16 comprises asingle support 22. - As illustrated in
Figs 10 and 11 thebaseplate 16 is arranged with throughholes 26 for receiving the fasteners, such as the rail screws 18. For example, thebaseplate 16 is substantially rectangular, seen from above as illustrated inFig. 11 , and provided with rounded corners. In such an embodiment thebaseplate 16 has long sides to be arranged substantially perpendicular to the longitudinal direction of therail 11, wherein theapertures 23, e.g. extend through thesupports 22 in a direction in parallel to said long sides. For example, thebaseplate 16 is moulded in a single piece. - In the illustrated embodiment the
baseplate 16 is comprises one or moreelevated portions 27 for supporting a part of thefastening element 17. In the illustrated embodiment thebaseplate 16 comprises twoelevated portions 27 arranged on thetop side 19 of thebaseplate 16 on opposite sides of therail supporting portion 20. For example, theelevated portions 27 are arranged adjacent to thesupports 22. Thesupport 22 is arranged between theelevated portion 27 and therail supporting portion 20. The supports 22 are arranged between theelevated portions 27. For example, theelevated portions 27 are elevated 6-10 mm, such as around 8 mm. - With reference to
Fig. 12 thesupport 22 is formed with theaperture 23 to provide a material thickness T around theaperture 23. The material thickness T is, for example, 8-20 mm, 10-14 mm or 12 mm. In the illustrated embodiment thesupport 22 is formed as an arch, wherein theaperture 23 at least has a rounded upper portion having a radius RA of, for example, 6-20 mm 8-16 mm or 10-12 mm. For example, the radius RA of the rounded upper portion of theaperture 23 is 10 mm. Except from thesupports 22,optional shoulders 21 and optionalelevated portions 27 thebaseplate 16 is, for example, arranged with a thickness of 10-20 mm or about 15 mm. - With reference to
Figs. 14-17 thefastening element 17 is illustrated according to one embodiment. Thefastening element 17 comprises a bottom portion, a top portion, afirst end portion 28, an oppositesecond end portion 29, anintermediate portion 30 and a centre axis A and is arranged to extend through theaperture 23 and overlap thefoot 15 of therail 11 for fastening of therail 11 to thebaseplate 16. Theintermediate portion 30 is arranged between the first andsecond end portions first end portion 28 is arranged to be inserted through theaperture 23 and overlap thefoot 15 of therail 11. Hence, thefirst end portion 28 is arranged to be inserted into theaperture 23 from the outer side thereof and brought through theentire aperture 23 to a position in which thefirst end portion 28 projects from the inner side of theaperture 23 and engages thefoot 15 of therail 11, while thesecond end portion 29 engages thebaseplate 16. For example, thesecond end portion 29 then projects from the outer side of theaperture 23. Thefastening element 17 is substantially cylindrical, e.g. at least partially having a substantially circular cross section. For example, at least theintermediate portion 30 has a circular cross section. In the illustrated embodiment the first andsecond end portions - The first and
second end portions fastening element 17 are formed with achamfer 31. Thechamfers 31 are arranged in the bottom portion of thefastening element 17, so that thechamfers 31 are arranged downwards when thefastening element 17 is arranged through theaperture 23. Thechamfer 31 of thefirst end portion 28 is arranged for engaging or facing thefoot 15 of therail 11, wherein thechamfer 31 of thesecond end portion 29 is arranged for engaging or facing thebaseplate 16, such as theelevated portion 27 thereof. For example, thechamfer 31 is arranged with a length C of 2-10 mm, 4-8 mm or about 6 mm, which is illustrated inFig. 16 . - In the illustrated embodiment the
chamfer 31 of thefastening element 17 comprises aninner bevel portion 32 being less steep than the remaining part of thechamfer 31. Hence, thebevel portion 32 is arranged between the remaining outer part of thechamfer 31 and theintermediate portion 30 of thefastening element 17. Alternatively, thebevel portion 32 extends into theintermediate portion 30. For example, bothchamfers 31 comprise thebevel portions 32, wherein thebevel portions 32 are arranged in the bottom portion of thefastening element 17. Thebevel portion 32 of thefirst end portion 28 is arranged for engaging thefoot 15 of therail 11, wherein thebevel portion 32 of thesecond end portion 29 is arranged for engaging thebaseplate 16, such as theelevated portion 27 thereof. Thebevel portion 32 is, e.g. arranged with a length B of 10-30 mm, 15-25 mm or about 20 mm, such as 19 mm. For example, the outer part of thechamfer 31 is arranged with an angle in relation to thebevel portion 32 and the length C to provide a difference G of about 1 mm between the outer edge of thechamfer 31 and the outer edge of thebevel portion 32. Alternatively, thechamfer 31 is arranged without thebevel portion 32 and is, e.g. arranged with constant or varying inclination. - The
fastening element 17 is arranged with a curvature. The curvature is arranged so that theend portions intermediate portion 30 when thefastening element 17 is arranged horizontally with thechamfer 31 facing downwards. Hence, the curvature is arranged so that thefirst end portion 28 is arranged above theintermediate portion 30 when therail 11 is secured to thebaseplate 16 by means of thefastening element 17. For example, at least theintermediate portion 30 is arranged with the curvature, wherein the centre axis A of theintermediate portion 30 is formed with a curvature having a radius RC. Alternatively, theentire fastening element 17 is arranged with said curvature. For example, theintermediate portion 30 extends between central parts of thebevel portions 32 as illustrated by means of the length I in inFig. 16 . Alternatively, theintermediate portion 30 extends to the outer edge of thebevel portions 32 or to the inner edge of thebevel portions 32. For example, the radius RC of the curvature is 400-600 mm or around 500 mm. For example, the length I of theintermediate portion 30 is 50-100 mm, 60-90 mm, 70-80 mm or around 75 mm. According to the illustrated embodiment the centre line A is curved at theend portions intermediate portion 30 and in the opposite direction as the curvature of theintermediate portion 30, which is indicated by means of the radius RE inFig. 16 . For example, the radius RE is 100-300 mm, 150-250 mm or about 200 mm. For example, the length and curvature of thefastening element 17 is arranged so that a deviation from a straight line between the end and the mid parts of the fastening element is 1-3 mm or about 2 mm as indicate by means of the arrows K inFig. 16 . For example, thefastening element 17 is arranged with a total length F of 80-120 mm, 100-110 mm or about 105 mm. For example, thefastening element 17 is arranged with a diameter D of 16-20 mm or about 18 mm, except at thechamfers 31, optionally with thebevel portions 32. - With reference to
Figs. 18-21 fixing of arail 11 to thestructure 12 in the form of a sleeper is illustrated schematically according to one embodiment. Thebaseplate 16 is fixed to thestructure 12 by means of fastening means. In the embodiment ofFig. 18 holes 33 are arranged in thestructure 12 for receiving fastening means in the form of rail screws 18. Then, thebaseplate 16 is arranged on a top surface of thestructure 12 and is fixed to thestructure 12 by means of the rail screws 18, which are screwed through theholes 26 in thebaseplate 16 and into theholes 33 in thestructure 12, which is illustrated by means of the arrows M inFig. 18 . Therail 11 is arranged on therail supporting portion 20 of thebaseplate 16. For example, therail 11 is arranged between theshoulders 21 and between thesupports 22 with theapertures 23, which is illustrated schematically by means of the arrow N inFig. 19 , wherein therail 11 is supported, either directly or indirectly, by thetop side 19 of thebaseplate 16. Optionally, an elastomeric plate or similar is arranged between therail supporting portion 20 and therail 11. Then, thefastening elements 17 are introduced into theaperture 23, which is illustrated by means of the arrows O and P inFig. 20 . InFig. 20 the rail screws 18 are not illustrated. Hence, thefirst end portion 28 is brought into theaperture 23 from the outer side thereof and is brought through theaperture 23 and out from the inner side thereof, i.e. the side facing therail 11. For example, thefastening element 17 is forced towards therail 11 by means of a tool for applying force on thesecond end portion 29 in a direction substantially along the centre axis A of thefastening element 17. Thefastening element 17 is forced in a direction substantially perpendicular to the longitudinal direction of therail 11. Thefirst end portion 28 is brought to engage thefoot 15 of therail 11, wherein a top portion of theintermediate portion 30 is brought against the inner top surface of thesupport 22 inside theaperture 23 and thesecond end portion 29 is brought to engage thebaseplate 16, such as theelevated portion 27, so that thefastening element 17 is wedged towards thefoot 15 of therail 11 through theaperture 23 in thesupport 22 and the second end portion abutting thebaseplate 16. In the illustrated embodiment thefastening elements 17 are brought towards theweb 14 of therail 11 in opposite directions, such as towards each other to engage thefoot 15 of therail 11 on opposite sides of theweb 14. Thefastening element 17 is efficiently wedged to therail 11 and thebaseplate 16 by means of the design of thefastening element 17 and thebaseplate 16, including the curvature and thechamfers fastening element 17. Hence, thechamfer 31 of thefirst end portion 28 is brought into engagement with thefoot 15 of therail 11, wherein thechamfer 31 of thesecond end portion 29 is brought into engagement with thetop side 19 of thebaseplate 16 or theelevated portion 27 while the concavely curved top portion of theintermediate portion 30 is brought against thesupport 22 inside theaperture 23. For example, thebevel portions 32 of thechamfers 31 are brought into contact with thefoot 15 of therail 11 and the top side of thebaseplate 16 or theelevated portion 27 thereof, respectively. Then, optionally theconstruction material 24 is arranged on top of thebaseplate 16, which is illustrated inFig. 21 .
Claims (12)
- A rail fastening device (10) for fastening a rail (11) to a structure (12), comprising a baseplate (16) and a fastening element (17), wherein the baseplate (16) is arranged to be fixed to the structure (12) and comprises a top side (19) having a rail supporting portion (20) and a support (22) with a through aperture (23) for receiving the fastening element (17), wherein the fastening element (17) is elongated, comprises a bottom portion, a top portion, a first end portion (28), a second end portion (29), an intermediate portion (30) and a centre axis (A) and is arranged to extend through the aperture (23) and partly overlap a foot (15) of the rail (11) for fastening of the rail (11) to the baseplate (16), wherein the aperture (23) at least partially is facing the rail (11) when the rail (11) is supported by the rail supporting portion (20), and wherein the first end portion (28) of the fastening element (17) is arranged to be inserted through the aperture (23) and overlap the foot (15) of the rail (11), wherein the first end portion (28) of the fastening element (17) is formed with a chamfer (31) in the bottom portion for engaging the foot (15) of the rail (11) when the fastening element (17) is inserted through the aperture (23),
characterised in that the second end portion (29) of the fastening element (17) is formed with a chamfer (31) in the bottom portion for engaging the baseplate (16), and the fastening element (17) is arranged with a curvature, wherein the bottom portion of the intermediate portion (30) of the fastening element (17) is convex. - A rail fastening device according to claim 1, wherein the chamfer (31) comprises an inner bevel portion (32) being less steep than the remaining part of the chamfer (31).
- A rail fastening device according to any of the preceding claims, wherein the top portion of the fastening element (17) is concave.
- A rail fastening device according to any of the preceding claims, wherein the intermediate portion (30) of the fastening element (17) is arranged with a substantially circular cross section.
- A rail fastening device according to any of the preceding claims, wherein the fastening element (17), apart from the chamfer (31), is formed with a substantially circular cross section.
- A rail fastening device according to any of the preceding claims, wherein the top side (19) of the baseplate (16) comprises supports (22) with apertures (23) on opposite sides of the rail supporting portion (20).
- A rail fastening device according to claim 6, wherein the apertures (23) of the supports (22) are facing each other.
- A method for fastening a rail (11) to a structure (12) by means of a fastening device (10) comprising a baseplate (16) and an elongated fastening element (17) having a curvature with a convex bottom portion, a top portion, a first end portion (28), a second end portion (29), an intermediate portion (30), and a centre axis (A), comprising the steps ofa) fastening the baseplate (16) to said structure (12),b) arranging the rail (11) on a rail supporting portion (20) on a top side (19) of said baseplate (16),c) inserting, in a direction towards the rail (11), the first end portion (28) of the fastening element (17) into an aperture (23) in a support (22) of said baseplate (16),d) bringing a chamfer (31) of said first end portion (28) through the aperture (23) and into engagement with a foot (15) of the rail (11), and bringing a chamfer (31) of said second end portion (29) into engagement with the baseplate (16), ande) by means of the chamfer (31) at the first and second end portions (28, 29) of the fastening element (17) and by means of the curvature of the fastening element (17) clamping the rail (11) to the baseplate (16) when the fastening element (17) is driven further through the aperture towards a web (14) of the rail (11).
- A method according to claim 8, comprising the step of driving the fastening element (17) towards the web (14) of the rail (11) in a direction perpendicular to a longitudinal direction of the rail (11).
- A method according to any of claims 8-9, comprising the step of arranging the fastening element (17) so that a bottom portion of the intermediate portion (30) is convex.
- A method according to any of claims 8-10, comprising the step of arranging the fastening element (17) so that a top portion of the intermediate portion (30) is concave.
- A method according to any of claims 8-11, comprising the step of fastening grooved tram rail to a road ground structure and/or a flat-bottom rail to a sleeper.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP16183038.5A EP3279397B1 (en) | 2016-08-05 | 2016-08-05 | Fixation of a rail to a tie plate by means of cylindrical clamping bolts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16183038.5A EP3279397B1 (en) | 2016-08-05 | 2016-08-05 | Fixation of a rail to a tie plate by means of cylindrical clamping bolts |
Publications (2)
Publication Number | Publication Date |
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EP3279397A1 EP3279397A1 (en) | 2018-02-07 |
EP3279397B1 true EP3279397B1 (en) | 2019-03-06 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP16183038.5A Active EP3279397B1 (en) | 2016-08-05 | 2016-08-05 | Fixation of a rail to a tie plate by means of cylindrical clamping bolts |
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EP (1) | EP3279397B1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1379531A (en) * | 1919-12-19 | 1921-05-24 | Francis W Cooper | Rail-anchor |
US2645427A (en) * | 1950-11-03 | 1953-07-14 | Naud Clovis | Rail fastening means |
CN101160434B (en) * | 2005-04-02 | 2011-11-16 | 科尔纳交通业股份公司 | Rail bearing |
-
2016
- 2016-08-05 EP EP16183038.5A patent/EP3279397B1/en active Active
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