Base plate and rail fastening arrangement

Abstract

A base plate includes a lateral support section and a lateral contact surface which delimits a supporting area formed on a top side of the base plate for a foot of a rail. A through-hole leading from the top side to the underside of the support section is formed into an edge area of the support section abutting the lateral contact surface. The through-hole has a basic shape which is angular in cross-section. The surface of the edge area meets with the contact surface in an upper marginal edge. A lateral surface of the through-hole assigned to the contact surface at least over a partial area of its height changes into an inclined surface which rises in the direction of the upper marginal edge of the contact surface and ends at the surface of the edge area.

Claims

1. A base plate for a rail fastening point, comprising at least one lateral support section which has a lateral contact surface which delimits a supporting area formed on a top side of the base plate, extending over a width of the base plate for a foot of a rail for a rail vehicle which is to be attached to the base plate, wherein a through-hole leading from the top side to an underside of the support section is formed into an edge area of the support section abutting on the lateral contact surface, to insert a rail spike through the through-hole, the through-hole having a basic shape which is angular in cross-section, and wherein a surface of the edge area meets with the contact surface in an upper marginal edge, wherein, starting from the underside of the support section, a lateral surface of the through-hole assigned to the contact surface rises in a first direction over a partial height of the through-hole whereupon the lateral surface of the through-hole assigned to the contact surface changes into an inclined surface which rises in a second direction of the upper marginal edge of the contact surface and ends at the surface of the edge area.

2. The base plate according to claim 1, wherein an upper end of the inclined surface ends at the surface of the edge area and butts against the upper marginal edge of the contact surface.

3. The base plate according to claim 1, wherein the inclined surface extends over at least one sixth of the height of the through-hole.

4. The base plate according to claim 1, wherein the inclined surface is at least in sections curved.

5. The base plate according to claim 2, wherein a groove respectively formed at least into corner areas of the lateral surface of the through-hole assigned to the contact surface outside of the inclined surface butts against the lateral surface of the through-hole over the partial height of the through-hole.

6. The base plate according to claim 5, wherein the groove is U-shaped and a leg surface of the groove forms an extension of the lateral surface of the through-hole assigned to the contact surface.

7. The base plate according to claim 6, wherein the groove extends into the area of the inclined surface, and in that the leg surface of the groove adjoining the inclined surface is inwardly curved in such a way that viewed in cross-section, on the one hand, the leg surface of the groove tangentially clings to a base surface of the groove and, on the other hand, the leg surface of the groove butts against the lateral edge of the inclined surface assigned to the contact surface.

8. The base plate according to claim 1, wherein two or more through-holes are formed into the support section and are distributed spaced apart from one another along the upper marginal edge of the contact surface of the support section.

9. The base plate according to claim 1, wherein the base plate has two support sections, each of which is provided with at least one through-hole and wherein the support sections have opposing lateral contact surfaces that delimit the supporting area in each case on one side of the supporting area.

10. The base plate according to claim 1, wherein an additional through-hole leading from the top side to the underside of the base plate and offset in a direction of an outer narrow side of the base plate remote from the supporting area is formed into at least one of the support sections, this additional through hole having at least one lateral surface which at least in one surface section abutting on the surface of the support section is inclined rising in a direction of the surface of the support section.

11. The base plate according to claim 10, wherein the inclined surface section is directed towards the supporting area.

12. The base plate according to claim 1, wherein a groove extending over the width of the supporting area is formed into a corner area, in which the supporting area meets the respective contact surface of the respective support section.

13. The base plate according to claim 1, wherein the base plate is produced from a plastic material.

14. A rail fastening arrangement, in which a rail for a rail vehicle is fastened to a base structure, comprising a sleeper, a base plate designed according to claim 1 and at least one rail spike, which has a spike shaft, which is inserted through the through-hole assigned to the contact surface of the respective support section and driven into the sleeper, and a spike head, which is formed onto the spike shaft, protrudes in a direction of the supporting area of the base plate, wherein an underside of the spike head has a support surface assigned to the top side of the base plate, which support surface rests in full surface contact on the inclined surface of the through-hole and on a free top side of the rail foot of the rail supported on the supporting area of the base plate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is explained in more detail based on a figure illustrating an exemplary embodiment. Each showing schematically:

(2) FIG. 1 a base plate in a perspective view;

(3) FIG. 2 the base plate in a plan view;

(4) FIG. 3 the base plate in a frontal view of one of its longitudinal sides;

(5) FIG. 4 a rail fastening point formed using the base plate, in a perspective view.

(6) The base plate 1 completely formed from a plastic material, for example from a glass fibre reinforced polyamide plastic material with the DIN short description PA 6 GF 30 (glass fibre proportion 30%) in plan view has a rectangular, elongated basic shape with two longitudinal sides 2, 3 running parallel to one another in the longitudinal direction LU of the base plate 1 and two narrow sides 4, 5 which are also aligned parallel to one another and transverse to the longitudinal sides 2, 3 and which extend over the width BU of the base plate 1.

(7) On its underside U, the base plate 1 has a flat seating surface 6, by means of which in the mounting position (FIG. 4) it rests on the flat supporting area 8 provided on the top side of a wooden sleeper 7.

DETAILED DESCRIPTION OF THE INVENTION

(8) A first support section 9 is formed on the base plate 1 abutting on the one narrow side 4, this support section 9 taking up the whole width BU and a first part length TL1 of the base plate 1. On the top side O of the base plate 1 opposing the underside U, the support section 9 rises continuously like a roof surface starting from the narrow side 4 until it reaches a narrow edge area 10 aligned parallel to the narrow side 4. The gradient initially increases in the edge area 10 until the surface 11 of the support section 9 ends in a narrow edge strip 12 approximately parallel to the flat seating surface 6.

(9) Thereby the surface 11 meets in an upper marginal edge 13 an end-face contact surface 14 of the support section 9 which is aligned perpendicular to the seating surface 6 and at right angles with the longitudinal sides 2, 3 of the base plate 1 and extends over its width BU.

(10) The contact surface 14 laterally delimits a flat supporting area 15, on which with a fully mounted fastening point B using the base plate 1 (FIG. 4), a conventionally formed rail S rests with its rail foot SF.

(11) A groove 17 which is U-shaped in cross-section and extends over the width BU is formed into the supporting area 15 in the corner area 16 in which the supporting area 15 and the contact surface 14 meet. The one leg surface 18 of the groove 17 forms an extension of the contact surface 14.

(12) A second support section 19 is formed on the base plate 1 abutting on its second narrow side 5 and also extending over the width BU and a part length TL2 of the base plate 1. The part length TL2 is shorter than the part length TL1 of the first support section 9. Apart from that, however, the form of the support section 19 matches to the form of the support section 9. Accordingly, it too rises like a roof, starting from the narrow side 5 assigned to it, until it reaches an edge area 20, in which the gradient of the surface 21 of the second support section 19 increases, until it ends via an edge strip 22 aligned approximately parallel to the seating surface 6 at an upper marginal edge 23. The surface 21 of the second support section 19 meets a contact surface 24, which extends parallel to the contact surface 14 of the first support section 9 over the width BU, on the upper marginal edge 23 extending over the width BU. The second support section 19 delimits with its contact surface 24 the supporting area 15 of the base plate 1 on its narrow side.

(13) Starting at the second support section 19, the supporting area 15 is inclined slightly rising like a roof surface in the direction of the first support section 9, in order to provide the rail S, which rests on it when the fastening point B is fully mounted, with a certain inclination.

(14) A groove 26, which is U-shaped in cross-section and extends over the width BU, is also formed into the supporting area 15 in the corner area 25 in which the supporting area 15 and the contact surface 24 meet. As with the groove 17, a leg surface 27 of the groove 26 forms an extension of the assigned contact surface 24.

(15) The risk of crack formation which could otherwise occur due to notch effects is minimised in the corner areas 16, 25 by the grooves 17, 26, which are arranged in such a way and cut into the supporting area 15.

(16) Two through holes 28, 29, 30, 31 leading from the top side O to the underside U of the base plate 1 and distributed spaced apart from one another along the respective upper marginal edge 13, 23 are in each case positioned in the edge areas 10, 20 of the support sections 9, 19. The through-holes 28-31 have a rectangular basic form in the cross-section aligned transverse to their longitudinal axis X, wherein with respect to the lateral surfaces 32, 33, 34, 35 delimiting the through-holes 28-31 in each case, the two lateral surfaces 32, 34 are aligned parallel to the respectively assigned contact surface 14, 24, while the two other lateral surfaces 33, 35 are aligned transverse to them.

(17) The lateral surfaces 33-35 are in each case aligned perpendicular to the flat seating surface 6 of the base plate 1 over the entire height H of the through-holes 28-31. The lateral surface 32 arranged parallel and closest adjacent to the respectively assigned contact surface 14, 24, on the other hand, starting from the seating surface 6 only extends over approximately two thirds of the height H and then changes smoothly into an inclined surface 36 which rises in the direction of the respectively assigned upper marginal edge 13, 23. Starting from the lateral surface 32, the inclined surface 36 is firstly outwardly curved in the manner of the outer peripheral surface of a cylinder segment around an axis which is aligned parallel to the respectively assigned marginal edge 13, 23 and is then ending in the edge strip 12, 22 of the respective support section 9, 19 abutting on the respective marginal edge 13, 23.

(18) A U-shaped groove 39, 40 is respectively formed into the lateral surfaces 33, 35 in the corner areas 37, 38 in which the lateral surfaces 33, 35 meet the lateral surface 32, whose one leg surface 41, 42 forms an extension of the lateral surface 32. In the area of the inclined surface 36, the leg surfaces 41, 42 of the grooves 39, 40 form the lateral limits of the respective through-hole 28-31. For this purpose, they are respectively inwardly curved in the area concerned such that, looking at the through-hole in plan view, they tangentially clings to the base of the respective groove 39, 40 and meet in an arch the respectively assigned edge of the inclined surface 36. By means of the grooves 39, 40 and the inwardly curved form of their leg surfaces 41, 42 widened in the area of the inclined surface 36, the risk of crack formation through notch effects in the corner areas 37, 38 is likewise minimised. The fact that the corner areas 43, 44, in which the lateral surface 34 meets the lateral surfaces 33, 35, are hollowed out in a fillet-shaped manner also contributes to the minimization of the risk of crack formation.

(19) In the longer first support sections 9, two further through-holes 45, 46, which are further away from the supporting area 15 and offset in the width direction in relation to the through-holes 28, 29 of the support section 9 and spaced apart from one another and offset in the longitudinal direction in relation to one another, are formed into the support section 9, whose basic shape corresponds to the shape of the through-holes 28, 29. However, in contrast to the through-holes 28, 29, in the case of the additional through-holes 45, 46 the inclined surface 47 directed towards the supporting area 15 starts at a lesser distance from the seating surface 6, so that in each case a longer ramp-like indentation rising in the direction of the supporting area 15 is formed into the top side O of the support section 9 by means of the inclined surface 47. In addition, in contrast to the through-holes 28, 29, in the case of the additional through-holes 45, 46 no stress-relieving grooves were formed in the corner areas of the lateral surfaces delimiting the through-hole.

(20) A further additional through-hole 48, matching the shape of the through-holes 45, 46, is formed offset centrally in relation to the through-holes 30, 31 and towards the narrow side 5 of the base plate 1 into the shorter support section 19. The inclined surface 49 of this additional through-hole 48 is also aligned at right angles with and in the direction of the supporting area 15 here.

(21) In order to mount the rail fastening point B shown in FIG. 4, the base plate 1 is placed with its seating surface 6 onto the supporting area 8 of the wooden sleeper 7. Then, the rail S is positioned with its rail foot SF on the supporting surface 15 of the base plate 1 which is accordingly aligned transverse to the longitudinal direction of the rail S with the wooden sleeper 7. The rail foot SF fits between the contact surfaces 14, 24 of the support sections 9, 19, through which the rail S is laterally guided and supported in the rail fastening point B.

(22) Rail spikes 50 are driven though the through-holes 28-31 and the additional through-holes 45, 46, 48 into the wooden sleeper 7 to fasten the rail S and the base plate 1 to the wooden sleeper 7. The rail spikes 50 each have a spike shaft, which is not visible here and rectangular in cross-section, and a spike head 51 which protrudes over one side of the spike shaft and has a support surface on its underside facing the base plate 1, wherein this support surface is merging in an inward curvature, corresponding to the outward curvature of the respective inclined surface 36, 47 of the through-holes 28-31 and 45, 46, 48 into the respectively assigned lateral surface of the spike shaft. Correspondingly, the rail spikes 50 each abut with the underside of their respective spike head 51 in full surface contact on the assigned inclined surface 36, 47 of the through-holes 28-31 and 45, 46, 48.

(23) In the case of the rail spikes 50 driven into the through-holes 28-31 assigned to the respective contact surface 14, 24, the spike heads 51 protrude beyond the assigned longitudinal edge of the rail foot SF. They correspondingly rest on the free top side of the rail foot SF and, in this way, hold the rail S with the required retaining force on the sleeper 7. In the case of the rail spikes 50 driven into the additional through-holes 45, 46 and 48, the spike heads 51, on the other hand, rest with the whole length of the support surface formed on its underside in full surface contact on the respectively assigned inclined surface 36, 47 of the additional through-holes 45, 46, 48, so that there too the surface pressure is evened out and the risk of crack formation or fracture is minimised.

LIST OF REFERENCE SYMBOLS

(24) 1 Base plate 2, 3 Longitudinal sides of the base plate 1 4, 5 Narrow sides of the base plate 1 6 Seating surface of the base plate 1 7 Wooden sleeper 8 Supporting area of the wooden sleeper 7 9 First support section of the base plate 1 10 Edge area of the support section 9 11 Surface of the support section 9 12 Edge strip of the support section 9 13 Upper marginal edge delimiting the contact surface 14 14 Contact surface of the support section 9 15 Supporting area of the base plate 1 16 Corner area between the supporting area 15 and the contact surface 14 17 U-shaped groove 18 Leg surface of the groove 17 19 Second support section of the base plate 1 20 Edge area of the second support section 19 21 Surface of the second support section 19 22 Edge strip of the second support section 19 23 Upper marginal edge delimiting the contact surface 24 24 Contact surface of the second support section 19 25 Corner area between the supporting area 15 and the contact surface 24 26 U-shaped groove 27 Leg surface of the groove 26 28-31 Through-holes 32-35 Lateral surfaces respectively delimiting the through-holes 28-31 36 Inclined surface of the through-holes 28-31 37, 38 Corner areas in which the lateral surfaces 33, 35 meet the lateral surface 32 39, 40 U-shaped grooves 41, 42 Leg surfaces of the grooves 39, 40 43, 44 Corner areas in which the lateral surface 34 meets the lateral surfaces 33, 35 45, 46 Additional through-holes of the first support section 9 47 Respective inclined surface of the additional through-holes 45, 46 48 Additional through-hole of the second support section 19 49 Inclined surface of the additional through-hole 48 50 Rail spikes 51 Respective spike head of the rail spikes 50 B Rail fastening point BU Width of the base plate 1 H Height of the through-holes 28-31 LU Longitudinal direction of the base plate 1 O Top side of the base plate 1 S Rail SF Rail foot TL1 Part length of the base plate 1 taken up by the support section 9 TL2 Part length of the base plate 1 taken up by the support section 19 U Underside of the base plate 1 X Longitudinal axis of the through-holes 28-31.