Base Plate and Rail Fastening Point

Abstract

The present invention relates to a base plate for a rail fastening point, in which a rail for a rail vehicle is fastened on a substrate. The base plate includes a main body with a rib structure, which from the underside assigned to the substrate is formed into the main body of the base plate and is formed by ribs and by recesses which surround the ribs and are open to the underside, and to a rail fastening point. The base plate for a rail fastening point can be manufactured in a simple, cost-effective manner and makes it possible to avoid by simple means pressing into a soft substrate. This is achieved in that the base plate additionally includes a cover fastened to the base plate after the manufacture of the main body, which covers the rib structure on the underside of the main body at least in sections.

Claims

1. A base plate for a rail fastening point, in which a rail for a rail vehicle is fastened on a substrate, the base plate comprising: a main body with a rib structure, which from the underside assigned to the substrate is formed into the main body of the base plate and is formed by ribs and by recesses which surround the ribs and are open to the underside; and a cover, which after manufacture of the main body is fastened to the base plate and which covers the rib structure on the underside of the main body at least in sections.

2. The base plate according to claim 1, wherein the cover is is firmly fixed to the base plate.

3. The base plate according to claim 1, wherein the cover is fastened to the base plate in a force- or form-locking manner.

4. The base plate according to claim 3, wherein at least one holding element is formed on the underside of the main body for the form- or force-locking holding of the cover.

5. The base plate according to claim 1, wherein the cover covers an area of the underside of the main body of the base plate, which during use is exposed to a higher pressure loading than an adjacent section not covered by the cover.

6. The base plate according to any one of the claim 1, wherein the base plate is formed as a rib plate, the rib plate comprising a top side having a contact surface for the rail to be fastened, wherein opposing narrow sides of the contact surface are respectively delimited by a guide rib.

7. The base plate according to claim 1, further comprising a depression corresponding to the shape of the cover formed in the area of the underside of the main body in which the cover is arranged, the depth of said depression being equal to the thickness of the cover.

8. The base plate according to claim 1, wherein the base plate is made of a plastic material.

9. The base plate according to any one of the claim 1, wherein the cover is made of a plastic material.

10. The base plate according to claim 1, wherein the cover is made of a metal material.

11. The base plate according to claim 1, wherein the cover and the main body are manufactured in one operation.

12. The base plate according claim 1, wherein the cover and the main body are manufactured separately from one another.

13. A rail fastening point, in which a rail for a rail vehicle is fastened on a substrate, comprising: a base plate formed according to claim 1, which rests with the underside of the main body on the substrate and on which the rail is supported; at least one spring element; and a tensioning element, by which the spring element is braced against the substrate, wherein the spring element exerts an elastic hold-down force by which the rail is held on the base plate.

14. The rail fastening point according to claim 13, wherein the substrate is formed by a wooden sleeper.

Description

[0031] Below the invention will be explained in more detail with reference to a drawing which illustrates an exemplary embodiment. Its figures show in each case schematically:

[0032] FIG. 1 a base plate in a perspective view from above;

[0033] FIG. 2 the base plate according to FIG. 1 in a perspective view from below;

[0034] FIG. 3 the main body of the base plate in a perspective view from below,

[0035] FIG. 4 a cover for the base plate in a perspective view from below;

[0036] FIG. 5 a rail fastening point formed with the base plate in a side view.

[0037] The base plate UP used in a rail fastening point P for fastening a rail S on a substrate U formed by a wooden sleeper comprises a main body 1, which is made of a fibre-reinforced polyamide plastic and is shaped as a rib plate. The base plate UP, seen from the top, has a rectangular basic shape with a width B measured in the longitudinal direction of the rail S to be fastened and a length L aligned transverse thereto.

[0038] On its top side 2 the main body 1 has a contact surface 3, which extends over the width B of the base plate UP. During use the rail S is located with its rail foot SF on the contact surface 3. Between the rail foot SF and the contact surface 3 there may be, in a manner known per se, further plate elements of elastic or rigid material not illustrated here to give the support of the rail S on the base plate UP a certain flexibility in the direction of gravity K or to evenly distribute the stresses that occur when the rail S is being crossed.

[0039] The rail S and the rail fastening point P form part of a track system not further illustrated here, with which parallel to the rail S a further similar rail is arranged at a defined distance and fastened in rail fastening points, which are each shaped like the rail fastening point P. Accordingly, with the rail S a distinction can be made between a longitudinal side L1, which is assigned to the field side FS facing away from the other rail of the track system, and a longitudinal side L2 which is assigned to the track side GS assigned to the other rail.

[0040] Since during use, when a rail vehicle travels over the rail S, greater stresses occur, the section 4 of the base plate UP assigned to the field side FS is longer and wider compared to the section 5 of the base plate UP assigned to the track side GS.

[0041] The contact surface 3 at its transitions to the sections 4, 5 is in each case limited by a guide rib 6, 7, which also extends over the width B of the base plate UP. In the guide ribs 6, 7, in each case aligned centrally in relation to the width B, a through-opening 8, 9 is formed, which leads from the top side 2 to the opposite underside 10 of the base plate UP and its main body 1, assigned to the substrate U.

[0042] The threaded shaft of a tensioning element 11, 12, normally a tensioning screw used for this purpose is respectively guided through, in a manner known per se, the through-openings 8, 9 during use said tensioning element sits with its head in a depression formed into the underside 10 and is supported in the longitudinal direction of the tensioning element 11, 12 against a shoulder of the main body 1 of the base plate UP formed there.

[0043] The section of the threaded shaft of the tensioning element 11, 12 that sticks out freely above the top side 2 engages through the centre loop of a ω-shaped spring element 13, 14, in the technical language also called a “tension clamp”, which is conventionally shaped and with the free ends of its holding arms exerts an elastic hold-down force on the rail foot SF, by which the rail S is kept pressed against the substrate U. To this end the spring elements 13, 14 are clamped against the main body 1 of the base plate UP by means of a nut 15, 16 screwed onto the respective threaded section of the tensioning elements 11, 12 and acting against the centre loop of the respective spring element 13, 14.

[0044] On the top side 2 of the main body 1 of the base plate UP shaped elements 17, 18 are formed in a manner known per se, which guide the spring elements 13, 14 and thus secure them in their position on the base plate UP.

[0045] The fastening of the base plate UP on the substrate U takes place by means of sleeper screws 19, 20 which are screwed into the substrate U through through-openings 21, 22, 23, 24 formed in the four corner areas of the main body 1.

[0046] A rib structure 25 consisting of diagonally aligned, intersecting ribs 26 and recesses 27 delimited by the ribs 26, is formed into the underside 10 of the main body 1 of the base plate UP. The rib structure 25 is bordered by a side wall 28 surrounding the base plate 1, the narrow side of which assigned to the underside 10 spans a contact surface 29, by means of which the base plate UP rests on the top side 30 of the substrate U during use.

[0047] In an area 31 of the underside 10 assigned to the field side FS, the ribs 26 of the rib structure 25 end with their narrow sides 32 assigned to the underside 10 at a distance AR from the contact surface 29, whereas the narrow sides 32 of the ribs assigned to the underside 10 lie outside this area 31 in the contact surface 29. In this way, a depression 33 is formed in the area 31 in the main body 1, said depression is intended to hold a cover 34 and the depth of which corresponds to the distance AR.

[0048] The area 31 extends here in the direction of the width B between the surrounding side wall 28 and in the direction of the length L proceeding from about the middle of the base plate UP in the direction of the narrow side 35 of the base plate UP assigned to the field side FS. It ends at the edge area 36 of the underside 10 adjoining the narrow side 35, into which the through-openings 21, 22 provided there are formed. In this way sufficient material is available in the edge area 36 for a dimensionally stable, secure and accurately-positioned fixing of the base plate UP on the substrate U under the effect of the sleeper screws 19, 20.

[0049] The peripheral shape of the cover 34, made as a flat, plate-like component, also for example of polyamide plastic, is adapted to the peripheral shape of the depression 33 provided in the main body 1. At the same time the thickness DA of the cover 34 corresponds to the distance AR by which the ribs 26 end in the area of the depression 33 underneath the contact surface 29. When the cover 34 is placed into the depression 33, the contact surface 37 of the cover 34 assigned to the substrate U is, therefore, aligned flush with the contact surface 29.

[0050] For an accurately-positioned fixing of the cover 34 in the depression 33 during the storage, the transport and the installation, four mushroom-shaped projections 38, 39, 40, 41 are formed integrally onto the main body 1 in the corner areas of the depression 33, which are pushed through correspondingly arranged through-openings 42, 43, 44, 45 of the cover 34. The diameter of the through-openings 42-45 is slightly smaller than the maximum diameter of the projections 38-41 such that when the projections 38-41 are pushed through, a slight elastic resistance must be overcome and the cover 34, after the projections 38-41 have penetrated the openings 42-45 with their thickest part, is held in a form-fitting manner on the main body 1.

[0051] During the installation of the base plate UP on the substrate U it may happen that the projections 38-41 break off or penetrate into the substrate U. However, this does not matter since at this point the cover 34 sits securely in the depression 33 and rests against the substrate U. The high pressure loads which occur when the rail fastening point P is crossed, concentrated in the area 28, are distributed evenly and over a large area via the cover 34 onto the substrate U such that pressing of the rib structure 25 into the substrate U is securely avoided here.

REFERENCE NUMERALS

[0052] 1 Main body of the base plate UP [0053] 2 Top side of the main body 1 [0054] 3 Contact surface [0055] 4 section of the base plate UP assigned to the field side FS [0056] 5 section of the base plate UP assigned to the track side GS [0057] 6, 7 Guide ribs [0058] 8, 9 Through-openings [0059] 10 Underside of the base plate UP and of the main body 1 [0060] 11, 12 Tensioning elements (tension screws) [0061] 13, 14 Spring elements (tension clamps) [0062] 15, 16 Nuts [0063] 17, 18 Shaped elements [0064] 19, 20 Sleeper screws [0065] 21-24 Through-openings in the four corner areas of the main body 1 [0066] 25 Rib structure [0067] 26 Ribs [0068] 27 Recesses [0069] 28 Surrounding side wall of the main body 1 [0070] 29 Contact surface of the main body 1 and of the base plate UP [0071] 30 Top side of the substrate U [0072] 31 Area of the underside 10 assigned to the field side FS [0073] 32 Narrow side of the ribs 26 [0074] 33 Depression [0075] 34 Cover [0076] 35 Narrow side of the base plate UP assigned to the field side FS [0077] 36 Edge area of the underside 10 [0078] 37 Contact surface of the cover 34 [0079] 38-41 Mushroom-shaped projections (holding elements for the cover 34) [0080] 42-45 Through-openings of the cover 34 [0081] AR Distance [0082] B Width of the base plate UP [0083] DA Thickness of the cover 34 [0084] FS Field side [0085] GS Track side [0086] K Direction of gravity [0087] L Length of the base plate UP [0088] L1, L2 Longitudinal sides of the rail S [0089] P Rail fastening point [0090] S Rail [0091] SF Rail foot [0092] U Substrate (wooden sleeper) [0093] UP Base plate