CA2195643A1 - Device for attaching a track rail to a sleeper - Google Patents
Device for attaching a track rail to a sleeperInfo
- Publication number
- CA2195643A1 CA2195643A1 CA002195643A CA2195643A CA2195643A1 CA 2195643 A1 CA2195643 A1 CA 2195643A1 CA 002195643 A CA002195643 A CA 002195643A CA 2195643 A CA2195643 A CA 2195643A CA 2195643 A1 CA2195643 A1 CA 2195643A1
- Authority
- CA
- Canada
- Prior art keywords
- rail
- cavity
- base
- thrust
- link length
- 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.)
- Abandoned
Links
- 241001669679 Eleotris Species 0.000 title abstract 3
- 230000005489 elastic deformation Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 239000000615 nonconductor Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 description 5
- 239000012777 electrically insulating material Substances 0.000 description 2
- 241000283986 Lepus Species 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 125000006850 spacer group Chemical group 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
- E01B9/02—Fastening rails, tie-plates, or chairs directly on sleepers or foundations; Means therefor
- E01B9/28—Fastening on wooden or concrete sleepers or on masonry with clamp members
- E01B9/30—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips
- E01B9/303—Fastening on wooden or concrete sleepers or on masonry with clamp members by resilient steel clips the clip being a shaped bar
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
Abstract
A device for attaching a track rail (R) to a sleeper (T), including a flexible supporting base (3) and side clamps consisting of loops (10). Said sleeper (T) comprises a longitudinal recess (2) in which the supporting base (3) is fitted, and said side clamps (1) consist of springs with at least one helical loop (10) designed to be resiliently tensioned and locked by means of at least one section in retaining abutment with the inner edges (20) of said recess (2) and in bearing engagement with the flange of the rail (R).
Description
~ ~ ~56~3 Correoted ~heet 1 [Engll~ pa~inatlon]
A DEVICE ~OR FASTE~N~ A TRACN RAIL ON A T~E
The pre~n~ inventlon rel~te~ to a device for fa~t~nin~ ~ tra~k rail on a tie or "s~eeper".
In gene~al, device~ of this type comprise i~
particular firstly a flexlble support pad place~ on the load-beariny ~urf~ce of the tie and on whi~h ~he base of the ra~l re~ts, and ~e~ ly ~ide clips oon~itut~a by ~prlng~, each $n the form of loop~, ea~h kept pr~s~ed a~ain~ ~h~ rail by ~aving one of its br~nches eng~ged ln an insert an~hn~ed ~n the tie~
~ y ela~tic deform~tion, th~ clip exerts a downwardly di~ for~e on the rall and an upwardly directed for~e on the in~er~.
Sin~e the ela6~ic defo~ma~ion o~ the ~lip iB ~
~ire¢t func~ion o~ th~ po~itlon~ng of th~ in~ert in the tie, lt will be unde~stood that any ~ariation in such pasltioning during manuf~cture o~ t~eB will l~ad to ~nc~ i rable variations in the force ~pplled to the rail .
In addition, the pre2~erlce of e~n insert anchor~d $n 2~) the tie compl ic~tes the de~ign of the tie and can weaken it, par~icularly with respe~t to lateral forces ln small-r~dlus cur~es.
Also, DE-A-38 26 362 de~c~i~es a dev~c~ for fastening a t~a~k rail on a tie pr~vided with a longi~ A 1 ca~ity i~ which ~ flex~ble Rupport p~d is re~eived, the devlce being of the type includin~ side clips con~ti~ted by Ypxi~g~ ea~h having ~t lea~t one helic~l loop ~or bein~ put under ten~ion by elastic d~form~tion ~nd fo~ lo~king at lea~t one length in ret~i n~ ~ abutment ~ir~tly again~t ~he inte~nal sidewalls of saia c~vlty ~nd ~ ]y in thrust on the b~se of the rail.
Ilo.~ x, that device doe~ not ensure effective retention o~ the rall and it ls relatively flifficult to install.
An ob~-c~ of the present ~nvention is to solve thes-te~..hn.i~l problem~ in s~isfactory manner.
1 a Corrected sheet t Engl i sh pagination~
Ac~ordin~ to the ln~rent~ on~ t~is obJ--~t is ~c:hieved by ~ean~ of a devlco for f a~tening a tra~k rail on a tie, the device c:ompr~ 8ing ln partit::ular a ~lexible ~upport pad and lateral cl lps congtituted by loops, and ~eing S characte~ized in that ~ald tie includes a ~ongitudinal cavi~y in whic:h the "~ L~J~ l, pad i~ recel~red, and in that Qald side clips a~e constituted by ~spring~ e~c~h incl udlng at least one helical loop desi~ne~ to b~ put under tenQlon by ela~tlc deformation and b~r locking at least 10 one length in retelinln~ abutment syalnst the intern~l ~i -' h~ of ~aid ca~i~y and ~y applying thru~t again~t the hase of the ra~l.
2~i q5643 The helical loop may optionally comprise a plurality of turns. This design makes it possible to provide spring clips that are very flexible and suitable for co-operating with support pads having very low stiffness, of the order of 20 kN/mm.
According to an advantageous characteristic, at least one of the clip end lengths is bent to fit in thrust contact against the edge of the base of the rail.
In a first variant embodiment, each of said spring clips comprises a helical loop with two end lengths, one of which thrusts against the base of the rail while the other of which thrusts against the internal sidewall of the cavity.
In a preferred variant embodiment, each spring clip is symmetrical about an axis extending transversely to the rail and comprises two helical loops connected together by a link length designed to extend at least in part in thrust contact both against the internal sidewalls of said cavity and against the base of the rail.
The link length may be rectilinear or curved and it optionally connects with the helical loops via two bends fitting against the edge of the base of the rail.
According to another characteristic, the top portions of the internal sidewalls of said cavity are provided with respective lips projecting towards the inside of the opening so as to define respective bottom thrust faces for locking the end lengths or the link length of the springs.
Also, the profile of the bottom thrust face of the lip fits round the profile of the end length or of the link length to enable snap-fastening thereof.
In a variant, said cavity includes internal sidewalls that are inclined so as to form a tapering opening whose width is slightly greater than that of the base of the rail.
~ ~ ~564 3 Optionally, the top portions of the internal sidewalls of said cavity project above the level of the top face of the tie.
Preferably, the internal face of said cavity is secured to a lining constituted by a baseplate that is preferably made of metal and/or of a layer of electrically insulating material; said layer may lie either on the external wall of the baseplate or on the internal wall of the cavity or of the baseplate, or in any other combination, applied on the external wall of the baseplate, it guarantees good adhesion with concrete and consequently satisfactory fastening with the tie.
For application on the internal wall of the cavity or of the baseplate, the material should be chosen as a function of its friction characteristics.
A first possibility consists in making said loop springs from a plate of circular or quadrilateral section.
Another possibility consists in making said loop springs from a plate of rectangular section, using flat strip steel.
According to yet another characteristic, the resultant of the thrust forces of the springs on the base of the rail is inclined to the vertical at an angle lying in the range 20~ to 60~. By reaction, this force resultant is taken up by the inclined internal face of the cavity.
The invention also provides a method of mounting a rail fastening device of the above type, characterized in that the stiffness, the shape, and the dimensions of the spring clips are initially chosen mainly as a function of the thickness and of the flexibility of the support pad so as to obtain thrust from the clips on the base of the rail that is directed along a resultant which is inclined relative to the vertical at an angle a lying in the range 20~ to 60~ by putting the loops under tension and locking them in said cavity.
~5643 The device of the invention is symmetrical about the transverse mid-axis of the rail and therefore possesses greater effectiveness.
Also, it is very easy to install the clips and there is no need for an additional part such as an insert. The thrust force on the rail obtained by elastic deformation of the spring clip does not depend on the shape of the cavity and is therefore independent of the accuracy with which the cavity is positioned relative to the tie; this guarantees excellent constancy for the thrust force.
The longitudinal cavity for receiving the rail and locking the clips can be made when the tie is manufactured. When the cavity is provided with a lining including a metal baseplate, the special shape of the cavity guarantees reliable anchoring of the load-bearing surface in the tie.
The present invention will be better understood on reading the following description accompanied by the drawings, in which:
~ Figures la and lb are side views in fragmentary longitudinal section on lines Ia and Ib respectively of two embodiments of the device of the invention;
~ Figure 2 is a cross-section view of the device of the invention on line II-II; the lefthand portion corresponds to the embodiment of Figure la and the righthand portion to the embodiment of Figure lb;
~ Figure 3 is a half-view in vertical section of a second embodiment of the invention;
~ Figure 4 is a half-view in vertical section of a third embodiment with the clip prior to installation;
~ Figure 5 is a half-view in vertical section of the embodiment of Figure 4 with the clip in the installed position;
~ Figures 6 and 7 are half-views in vertical section of two other embodiments of the invention with the clips in the installed position; and ~ ~ ~ 56~3 ~ Figure 8 is a section view through yet another embodiment of the invention.
The device of the invention shown in Figures la and lb in side view is for fastening a rail R to a tie T, generally made of concrete, by means of loop clips 1.
According to the invention, the tie T has a longitudinal cavity 2 in which there is received a flexible support pad 3 for the base of the rail R. The cavity 2 extends over the entire width of the tie T. The flexibility and the thickness of the pad 3 are determined so that pad depression under passage of wheel loads creates clearance allowing the rail to rotate, where necessary, particularly in curves. Nevertheless, such rotation is advantageously restricted by contact being reestablished between the end length 12 or the link length 11 and the internal wall of the cavity 2.
The side clips are constituted by preferably metal springs 1 having at least one helical loop 10 made up of one or more turns 100. The loops 10 are deformed elastically to create the thrust force on the base of the rail R. This thrust is achieved by putting the loops lO
under tension and it is maintained by locking the end lengths 12 in retaining abutment against the internal sidewalls 20 of the cavity 2. The tendency of the loop to relax produces thrust from at least one of the lengths against the edge B of the rail. The quality of contact between the end lengths 11 and the internal sidewalls 20 of the cavity 2 is improved by securely covering the walls, and in particular the internal sidewalls 20, with a lining 21 constituted by a baseplate that is preferably made of metal and/or of a layer of appropriate material having good electrical insulation properties. This layer may cover either the external wall of the baseplate or the internal wall of the cavity 2 or of the metal baseplate, or any other combination. Applied on the external wall of the baseplate (see Figure 8) its good adhesion properties guarantee satisfactory fastening to ~ ~ 95643 the concrete of the tie T, whereas applied to the internal wall of the cavity or of the baseplate, it participates in friction phenomena.
In the embodiment of Figures la, lb, and 2, the spring clips 1 are symmetrical about an axis extending transversely to the rail and each comprises two helical loops 10 connected together by a link length 11 designed to extend at least partially in thrust contact against the internal sidewalls 20 of the wall of the cavity 2 or of its lining 21. The link length 11 may be rectilinear as shown in Figures lb and 2 (righthand portion) fitting against the side edge B of the base of the rail R. In this case, the link length 11 is connected to the two helical loops 10 by two bends 110 which, in the absence of any wheel loading, are in contact with the internal sidewalls 20. The link length 11 thus forms a spacer for positioning the rail by contact with the internal sidewalls 20 and with the edge B of the rail R. Still in this embodiment, the end lengths 12 are rectilinear and extend in contact with the internal sidewalls 20 over their entire lengths. In this position, the end lengths are not in contact with the rail in its installed position. It is also possible for the link length 11 to be curved, as shown in Figures la and 2 (lefthand portion). In this case, the link length 11 is spaced apart from the edge B of the rail R but comes into contact along its entire length with the internal sidewalls 20 of the cavity 2; the end length 12 is bent so as to fit against and apply thrust to the edge B of the rail R.
The thrust force is exerted on the rail via the bent portions of the end lengths 12 (Figure la) or via the bends 110 of the link length 11 (Figure lb). This thrust force on the rail is balanced by a reaction force from the link length 11 or the end lengths 12 on the internal sidewalls 20.
~i~56~3 The cavity 2 has internal sidewalls 20 that are inclined so as to form a tapering opening of width slightly greater than that of the base of the rail R, thereby enabling the rail to be accurately positioned on the pad 3.
In the embodiment of the invention shown in Figure 3, the top portions of the internal sidewalls 20 of the cavity 2 are provided with respective lips 22.
These lips project into the opening so as to define bottom thrust surfaces 22a for locking the end lengths 12a, 12b.
After elastic deformation of a loop 10, the end lengths 12a, 12b snap into the cavity 2 between the edge B of the rail R and the lip 22 and thus remain in retaining abutment against the bottom thrust face 22a whose profile fits against the profile of the end lengths.
Figure 4 shows a spring clip 1 before being installed in the cavity 2. The loop is made in this case using a rod of square quadrilateral section.
The link length 11 rests on the top portion of the internal sidewalls 20 of the cavity 2 while the end lengths 12 rest against the edge B of the base of the rail R.
The top portions of the internal sidewalls 20 have respective inclined faces 23 extending to the lips 22 and possibly projecting above the level of the top face of the tie. Each inclined face 23 provides sliding contact for the link length 11 of the spring 1 when thrust is applied on the loop 10 towards the inside of the cavity 2 in direction F until the link length snaps under the lip 22 and locks in contact with the bottom thrust face 22a.
Simultaneously, the end lengths 12 slide over the base of the rail R towards the inside of the cavity 2 and lock in abutment against the internal sidewalls 20 and the edge B of said base, as shown in Figure 5.
6~3 The loop 10 is then under tension and creates the thrust force on the rail via the bent portion of the end lengths 12. The link length bears locally against an inclined face 26 set back relative to the longitudinal extent of the top portion of the lip 22.
Figure 6 shows another embodiment in which the top portions of the internal sidewalls 20 have rounded edges 24 located above a hollow housing 25 for receiving the link length 11 to lock it by snap-fastening after sliding an elastic deformation in contact with the edge 24.
Figure 7 should be compared with Figure 4 and it shows yet another embodiment in which the end length 12 is locked firstly by being subjected to elastic deformation on contact with the inclined face 23 situated at the top of the internal sidewalls 20, and then by snap-fastening beneath the lip 22 in contact with the bottom thrust face 22a.
The link length 11 is wsidewalld in the cavity 2 between the edge B of the base of the rail R and the internal sidewalls 20, fitting against said edge B by means of bends 110 (see Figure 2, righthand portion).
Figure 8 shows yet another embodiment of the invention in which the helical loop 10 is asymmetrical having a first end length 12a pressing against the base of the rail R by fitting against its edge B, and a second end length 12b pressing against the internal sidewall 20 of the cavity 2.
In this embodiment, it is preferable for the loop 10 to be made from flat steel strip and the layer of electrically insulating material is applied to the external wall of the lining 21 in contact with the concrete of the tie T to improve fastening.
In all of the embodiments shown, the direction of the resultant of the thrust forces from the loops 10 of the springs l on the base of the rail R is inclined at an angle a lying in the range 20~ to 60~ relative to the vertical.
~ 1 ~5643 The rail fastening device is assembled by initially selecting the stiffness, the shape, and the dimensions of the spring clips 1 having loops 10, mainly as a function of the thickness and the flexibility of the support pad 3 so as to obtain a thrust force from the springs on the base on the rail R that is directed along a resultant inclined at an angle a relative to the vertical by putting the loops 10 under tension and locking them in the cavity 2.
A DEVICE ~OR FASTE~N~ A TRACN RAIL ON A T~E
The pre~n~ inventlon rel~te~ to a device for fa~t~nin~ ~ tra~k rail on a tie or "s~eeper".
In gene~al, device~ of this type comprise i~
particular firstly a flexlble support pad place~ on the load-beariny ~urf~ce of the tie and on whi~h ~he base of the ra~l re~ts, and ~e~ ly ~ide clips oon~itut~a by ~prlng~, each $n the form of loop~, ea~h kept pr~s~ed a~ain~ ~h~ rail by ~aving one of its br~nches eng~ged ln an insert an~hn~ed ~n the tie~
~ y ela~tic deform~tion, th~ clip exerts a downwardly di~ for~e on the rall and an upwardly directed for~e on the in~er~.
Sin~e the ela6~ic defo~ma~ion o~ the ~lip iB ~
~ire¢t func~ion o~ th~ po~itlon~ng of th~ in~ert in the tie, lt will be unde~stood that any ~ariation in such pasltioning during manuf~cture o~ t~eB will l~ad to ~nc~ i rable variations in the force ~pplled to the rail .
In addition, the pre2~erlce of e~n insert anchor~d $n 2~) the tie compl ic~tes the de~ign of the tie and can weaken it, par~icularly with respe~t to lateral forces ln small-r~dlus cur~es.
Also, DE-A-38 26 362 de~c~i~es a dev~c~ for fastening a t~a~k rail on a tie pr~vided with a longi~ A 1 ca~ity i~ which ~ flex~ble Rupport p~d is re~eived, the devlce being of the type includin~ side clips con~ti~ted by Ypxi~g~ ea~h having ~t lea~t one helic~l loop ~or bein~ put under ten~ion by elastic d~form~tion ~nd fo~ lo~king at lea~t one length in ret~i n~ ~ abutment ~ir~tly again~t ~he inte~nal sidewalls of saia c~vlty ~nd ~ ]y in thrust on the b~se of the rail.
Ilo.~ x, that device doe~ not ensure effective retention o~ the rall and it ls relatively flifficult to install.
An ob~-c~ of the present ~nvention is to solve thes-te~..hn.i~l problem~ in s~isfactory manner.
1 a Corrected sheet t Engl i sh pagination~
Ac~ordin~ to the ln~rent~ on~ t~is obJ--~t is ~c:hieved by ~ean~ of a devlco for f a~tening a tra~k rail on a tie, the device c:ompr~ 8ing ln partit::ular a ~lexible ~upport pad and lateral cl lps congtituted by loops, and ~eing S characte~ized in that ~ald tie includes a ~ongitudinal cavi~y in whic:h the "~ L~J~ l, pad i~ recel~red, and in that Qald side clips a~e constituted by ~spring~ e~c~h incl udlng at least one helical loop desi~ne~ to b~ put under tenQlon by ela~tlc deformation and b~r locking at least 10 one length in retelinln~ abutment syalnst the intern~l ~i -' h~ of ~aid ca~i~y and ~y applying thru~t again~t the hase of the ra~l.
2~i q5643 The helical loop may optionally comprise a plurality of turns. This design makes it possible to provide spring clips that are very flexible and suitable for co-operating with support pads having very low stiffness, of the order of 20 kN/mm.
According to an advantageous characteristic, at least one of the clip end lengths is bent to fit in thrust contact against the edge of the base of the rail.
In a first variant embodiment, each of said spring clips comprises a helical loop with two end lengths, one of which thrusts against the base of the rail while the other of which thrusts against the internal sidewall of the cavity.
In a preferred variant embodiment, each spring clip is symmetrical about an axis extending transversely to the rail and comprises two helical loops connected together by a link length designed to extend at least in part in thrust contact both against the internal sidewalls of said cavity and against the base of the rail.
The link length may be rectilinear or curved and it optionally connects with the helical loops via two bends fitting against the edge of the base of the rail.
According to another characteristic, the top portions of the internal sidewalls of said cavity are provided with respective lips projecting towards the inside of the opening so as to define respective bottom thrust faces for locking the end lengths or the link length of the springs.
Also, the profile of the bottom thrust face of the lip fits round the profile of the end length or of the link length to enable snap-fastening thereof.
In a variant, said cavity includes internal sidewalls that are inclined so as to form a tapering opening whose width is slightly greater than that of the base of the rail.
~ ~ ~564 3 Optionally, the top portions of the internal sidewalls of said cavity project above the level of the top face of the tie.
Preferably, the internal face of said cavity is secured to a lining constituted by a baseplate that is preferably made of metal and/or of a layer of electrically insulating material; said layer may lie either on the external wall of the baseplate or on the internal wall of the cavity or of the baseplate, or in any other combination, applied on the external wall of the baseplate, it guarantees good adhesion with concrete and consequently satisfactory fastening with the tie.
For application on the internal wall of the cavity or of the baseplate, the material should be chosen as a function of its friction characteristics.
A first possibility consists in making said loop springs from a plate of circular or quadrilateral section.
Another possibility consists in making said loop springs from a plate of rectangular section, using flat strip steel.
According to yet another characteristic, the resultant of the thrust forces of the springs on the base of the rail is inclined to the vertical at an angle lying in the range 20~ to 60~. By reaction, this force resultant is taken up by the inclined internal face of the cavity.
The invention also provides a method of mounting a rail fastening device of the above type, characterized in that the stiffness, the shape, and the dimensions of the spring clips are initially chosen mainly as a function of the thickness and of the flexibility of the support pad so as to obtain thrust from the clips on the base of the rail that is directed along a resultant which is inclined relative to the vertical at an angle a lying in the range 20~ to 60~ by putting the loops under tension and locking them in said cavity.
~5643 The device of the invention is symmetrical about the transverse mid-axis of the rail and therefore possesses greater effectiveness.
Also, it is very easy to install the clips and there is no need for an additional part such as an insert. The thrust force on the rail obtained by elastic deformation of the spring clip does not depend on the shape of the cavity and is therefore independent of the accuracy with which the cavity is positioned relative to the tie; this guarantees excellent constancy for the thrust force.
The longitudinal cavity for receiving the rail and locking the clips can be made when the tie is manufactured. When the cavity is provided with a lining including a metal baseplate, the special shape of the cavity guarantees reliable anchoring of the load-bearing surface in the tie.
The present invention will be better understood on reading the following description accompanied by the drawings, in which:
~ Figures la and lb are side views in fragmentary longitudinal section on lines Ia and Ib respectively of two embodiments of the device of the invention;
~ Figure 2 is a cross-section view of the device of the invention on line II-II; the lefthand portion corresponds to the embodiment of Figure la and the righthand portion to the embodiment of Figure lb;
~ Figure 3 is a half-view in vertical section of a second embodiment of the invention;
~ Figure 4 is a half-view in vertical section of a third embodiment with the clip prior to installation;
~ Figure 5 is a half-view in vertical section of the embodiment of Figure 4 with the clip in the installed position;
~ Figures 6 and 7 are half-views in vertical section of two other embodiments of the invention with the clips in the installed position; and ~ ~ ~ 56~3 ~ Figure 8 is a section view through yet another embodiment of the invention.
The device of the invention shown in Figures la and lb in side view is for fastening a rail R to a tie T, generally made of concrete, by means of loop clips 1.
According to the invention, the tie T has a longitudinal cavity 2 in which there is received a flexible support pad 3 for the base of the rail R. The cavity 2 extends over the entire width of the tie T. The flexibility and the thickness of the pad 3 are determined so that pad depression under passage of wheel loads creates clearance allowing the rail to rotate, where necessary, particularly in curves. Nevertheless, such rotation is advantageously restricted by contact being reestablished between the end length 12 or the link length 11 and the internal wall of the cavity 2.
The side clips are constituted by preferably metal springs 1 having at least one helical loop 10 made up of one or more turns 100. The loops 10 are deformed elastically to create the thrust force on the base of the rail R. This thrust is achieved by putting the loops lO
under tension and it is maintained by locking the end lengths 12 in retaining abutment against the internal sidewalls 20 of the cavity 2. The tendency of the loop to relax produces thrust from at least one of the lengths against the edge B of the rail. The quality of contact between the end lengths 11 and the internal sidewalls 20 of the cavity 2 is improved by securely covering the walls, and in particular the internal sidewalls 20, with a lining 21 constituted by a baseplate that is preferably made of metal and/or of a layer of appropriate material having good electrical insulation properties. This layer may cover either the external wall of the baseplate or the internal wall of the cavity 2 or of the metal baseplate, or any other combination. Applied on the external wall of the baseplate (see Figure 8) its good adhesion properties guarantee satisfactory fastening to ~ ~ 95643 the concrete of the tie T, whereas applied to the internal wall of the cavity or of the baseplate, it participates in friction phenomena.
In the embodiment of Figures la, lb, and 2, the spring clips 1 are symmetrical about an axis extending transversely to the rail and each comprises two helical loops 10 connected together by a link length 11 designed to extend at least partially in thrust contact against the internal sidewalls 20 of the wall of the cavity 2 or of its lining 21. The link length 11 may be rectilinear as shown in Figures lb and 2 (righthand portion) fitting against the side edge B of the base of the rail R. In this case, the link length 11 is connected to the two helical loops 10 by two bends 110 which, in the absence of any wheel loading, are in contact with the internal sidewalls 20. The link length 11 thus forms a spacer for positioning the rail by contact with the internal sidewalls 20 and with the edge B of the rail R. Still in this embodiment, the end lengths 12 are rectilinear and extend in contact with the internal sidewalls 20 over their entire lengths. In this position, the end lengths are not in contact with the rail in its installed position. It is also possible for the link length 11 to be curved, as shown in Figures la and 2 (lefthand portion). In this case, the link length 11 is spaced apart from the edge B of the rail R but comes into contact along its entire length with the internal sidewalls 20 of the cavity 2; the end length 12 is bent so as to fit against and apply thrust to the edge B of the rail R.
The thrust force is exerted on the rail via the bent portions of the end lengths 12 (Figure la) or via the bends 110 of the link length 11 (Figure lb). This thrust force on the rail is balanced by a reaction force from the link length 11 or the end lengths 12 on the internal sidewalls 20.
~i~56~3 The cavity 2 has internal sidewalls 20 that are inclined so as to form a tapering opening of width slightly greater than that of the base of the rail R, thereby enabling the rail to be accurately positioned on the pad 3.
In the embodiment of the invention shown in Figure 3, the top portions of the internal sidewalls 20 of the cavity 2 are provided with respective lips 22.
These lips project into the opening so as to define bottom thrust surfaces 22a for locking the end lengths 12a, 12b.
After elastic deformation of a loop 10, the end lengths 12a, 12b snap into the cavity 2 between the edge B of the rail R and the lip 22 and thus remain in retaining abutment against the bottom thrust face 22a whose profile fits against the profile of the end lengths.
Figure 4 shows a spring clip 1 before being installed in the cavity 2. The loop is made in this case using a rod of square quadrilateral section.
The link length 11 rests on the top portion of the internal sidewalls 20 of the cavity 2 while the end lengths 12 rest against the edge B of the base of the rail R.
The top portions of the internal sidewalls 20 have respective inclined faces 23 extending to the lips 22 and possibly projecting above the level of the top face of the tie. Each inclined face 23 provides sliding contact for the link length 11 of the spring 1 when thrust is applied on the loop 10 towards the inside of the cavity 2 in direction F until the link length snaps under the lip 22 and locks in contact with the bottom thrust face 22a.
Simultaneously, the end lengths 12 slide over the base of the rail R towards the inside of the cavity 2 and lock in abutment against the internal sidewalls 20 and the edge B of said base, as shown in Figure 5.
6~3 The loop 10 is then under tension and creates the thrust force on the rail via the bent portion of the end lengths 12. The link length bears locally against an inclined face 26 set back relative to the longitudinal extent of the top portion of the lip 22.
Figure 6 shows another embodiment in which the top portions of the internal sidewalls 20 have rounded edges 24 located above a hollow housing 25 for receiving the link length 11 to lock it by snap-fastening after sliding an elastic deformation in contact with the edge 24.
Figure 7 should be compared with Figure 4 and it shows yet another embodiment in which the end length 12 is locked firstly by being subjected to elastic deformation on contact with the inclined face 23 situated at the top of the internal sidewalls 20, and then by snap-fastening beneath the lip 22 in contact with the bottom thrust face 22a.
The link length 11 is wsidewalld in the cavity 2 between the edge B of the base of the rail R and the internal sidewalls 20, fitting against said edge B by means of bends 110 (see Figure 2, righthand portion).
Figure 8 shows yet another embodiment of the invention in which the helical loop 10 is asymmetrical having a first end length 12a pressing against the base of the rail R by fitting against its edge B, and a second end length 12b pressing against the internal sidewall 20 of the cavity 2.
In this embodiment, it is preferable for the loop 10 to be made from flat steel strip and the layer of electrically insulating material is applied to the external wall of the lining 21 in contact with the concrete of the tie T to improve fastening.
In all of the embodiments shown, the direction of the resultant of the thrust forces from the loops 10 of the springs l on the base of the rail R is inclined at an angle a lying in the range 20~ to 60~ relative to the vertical.
~ 1 ~5643 The rail fastening device is assembled by initially selecting the stiffness, the shape, and the dimensions of the spring clips 1 having loops 10, mainly as a function of the thickness and the flexibility of the support pad 3 so as to obtain a thrust force from the springs on the base on the rail R that is directed along a resultant inclined at an angle a relative to the vertical by putting the loops 10 under tension and locking them in the cavity 2.
Claims (16)
1/ A device for fastening a track rail (R) on a tie (T) provided with a longitudinal cavity (2) in which a flexible support pad (3) is received, the device being of the type comprising side clips constituted by springs each including at least one helical loop (10) designed to be put under tension by elastic deformation and by locking at least one length in retaining abutment both against the internal sidewalls (20) of said cavity (2) and against the base of the rail (R), the device being characterized in that at least one of the clip end lengths (12) is bent to fit in thrust contact against the edge (B) of the base of the rail (R).
2/ A device according to claim 1, characterized in that the internal sidewalls (20) of said cavity (2) are inclined so as to form a tapering opening whose width is slightly greater than that of the base the rail.
3/ A device according to claim 1 or 2, characterized in that each of said spring clips comprises a helical loop (10) with two end lengths (12a, 12b), one of which (12a) thrusts against the base of the rail (R) while the other of which (12) thrusts against the internal sidewall (20) of the cavity (2).
4/ A device according to claim 1 or 2, characterized in that each spring clip (1) is symmetrical about an axis extending transversely to the rail (R) and comprises two helical loops (10) connected together by a link length (11) designed to extend at least in part in thrust contact both against the internal sidewalls (20) of said cavity and against the base of the rail.
5/ A device according claim 4, characterized in that the top portions of the internal sidewalls (20) of said cavity (2) are provided with respective lips (22) projecting towards the inside of the opening so as to define respective bottom thrust faces (22a) for locking the end lengths (12) or the link length (11) of the springs (1).
6/ A device according to claim 4 or 5, characterized in that said link length (11) is rectilinear.
7/ A device according to claim 4 or 5, characterized in that said link length (11) is curved.
8/ A device according to any one of claims 4 to 7, characterized in that said link length (11) is connected to the helical loops (10) via two bends (110) that fit against the edge (B) of the base of the rail (R).
9/ A device according to any preceding claim, characterized in that the internal face of said cavity (2) is secured to a lining constituted by a preferably metallic baseplate and/or a layer of material (21) that is simultaneously a good electrical insulator, that has good adhesion with concrete, and that provides friction contact with the loop-constituting material.
10/ A device according to any preceding claim, characterized in that the helical loop (10) comprises a plurality of turns (100).
11/ A device according to any preceding claim, characterized in it that said springs (1) in loop form (10) are made from a plate of rectangular section using flat strip steel.
11/ A device according to any preceding claim, characterized in it that said springs (1) in loop form (10) are made from a plate of rectangular section using flat strip steel.
11/ A device according to any preceding claim, characterized in that said spring (1) in loop form are made from rods of circular or quadrilateral section.
12
13/ A device according to any preceding claim, characterized in that the resultant direction of the thrust forces of the springs against the base of the rail is inclined at an angle .alpha. lying in the range 20° to 60°
relative to the vertical.
relative to the vertical.
14/ A device according to any preceding claim, characterized in that the top portions of the internal sidewalls (20) of said cavity (2) project above the level of the top face of the tie (T).
15/ A device according to claim 5, characterized in that the profile of the bottom thrust face (22a) of the lip (22) fits against the profile of the end length (12) or against the profile of the link length (11) to enable snap-fastening thereof.
16/ A method of installing a rail fastener device according to any preceding claim, characterized in that the stiffness, the shape, and the dimensions of the spring clips (1) are initially chosen mainly as a function of the thickness and of the flexibility of the support pad (3) so as to obtain thrust from the clips (1) on the base of the rail that is directed along a resultant which is inclined relative to the vertical at an angle a lying in the range 20° to 60° by putting the loops (10) under tension and locking them in said cavity (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9409090 | 1994-07-22 | ||
| FR9409090A FR2722807B1 (en) | 1994-07-22 | 1994-07-22 | DEVICE FOR FIXING A RAILWAY RAIL ON A CROSSING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2195643A1 true CA2195643A1 (en) | 1996-02-08 |
Family
ID=9465653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002195643A Abandoned CA2195643A1 (en) | 1994-07-22 | 1995-07-21 | Device for attaching a track rail to a sleeper |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA2195643A1 (en) |
| FI (1) | FI970255A (en) |
| FR (1) | FR2722807B1 (en) |
| NO (1) | NO970189L (en) |
| SE (1) | SE9700137L (en) |
| WO (1) | WO1996003547A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485217A (en) * | 2019-08-27 | 2019-11-22 | 上海工程技术大学 | It is a kind of for frequency modulation rail damper to be fixed on the clip on rail |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1363386A (en) * | 1963-05-02 | 1964-06-12 | Ressorts Du Nord Sa | Elastic rail fastener and its combination with a concrete sleeper |
| FR1603118A (en) * | 1968-07-02 | 1971-03-22 | ||
| DE2122146A1 (en) * | 1971-05-05 | 1972-11-16 | Lange, Lotte, 4050 Mönchengladbach | Wire wound into a spring clip |
| FR2623827B1 (en) * | 1987-11-27 | 1991-04-19 | Ressorts Ind | DEVICE FOR FIXING A RAILWAY RAIL ON A CROSSBAR, A FASTENER AND AN INSERT |
| DE3826362A1 (en) * | 1988-08-03 | 1990-02-08 | Erich Radler | Mounting for a rail laid in a channel in a track-supporting slab |
| DE3842534C1 (en) * | 1988-12-17 | 1990-07-26 | Hoesch Ag, 4600 Dortmund, De |
-
1994
- 1994-07-22 FR FR9409090A patent/FR2722807B1/en not_active Expired - Lifetime
-
1995
- 1995-07-21 WO PCT/FR1995/000983 patent/WO1996003547A1/en active Application Filing
- 1995-07-21 CA CA002195643A patent/CA2195643A1/en not_active Abandoned
-
1997
- 1997-01-16 NO NO970189A patent/NO970189L/en not_active Application Discontinuation
- 1997-01-20 SE SE9700137A patent/SE9700137L/en not_active Application Discontinuation
- 1997-01-22 FI FI970255A patent/FI970255A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2722807B1 (en) | 1996-10-11 |
| NO970189L (en) | 1997-01-22 |
| WO1996003547A1 (en) | 1996-02-08 |
| NO970189D0 (en) | 1997-01-16 |
| FR2722807A1 (en) | 1996-01-26 |
| FI970255A0 (en) | 1997-01-22 |
| SE9700137D0 (en) | 1997-01-20 |
| FI970255A (en) | 1997-01-22 |
| SE9700137L (en) | 1997-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |