EP2635742B1 - Tension clamp for fastening a rail, and system equipped with a tension clamp of said type - Google Patents

Description

The invention relates to a tensioning clamp for fastening a rail with a central portion, with at least one torsion portion extending laterally from the central portion, with at least one transition portion adjoining the torsion portion and at least one retaining arm connected to the transition portion, the free end of the support arm assigned end portion is seen in plan view of the tension clamp angled away from the torsion section. Clamps of this type are usually bent in one piece from a spring steel.

Likewise, the invention relates to a system for fastening a rail, which has a rail, a standing bridge and a rail head, with a guide plate, a clamp held on the guide plate and a clamping means for clamping the clamp against a rail supporting the base.

A tension clamp and a system of this kind are from the DE 10 2007 046 543 A1 known. In the known system is used as a spring element for generating the hold down the Rail required resilient elastic holding force is a tension clamp used, which is designed taking into account the measured in the longitudinal direction of the rail to be fastened length of the support plate so that at least one support arm can travel maximum spring travel. In this case, the end portion of the support arm is angled away from the torsion section in such a way that, in the assembly position, it points in the direction of the web of the rail to be fastened. By this measure, on the one hand, the narrowly defined, formed at the free tip of the respective end portion support region in which the arm exerts the required hold-down force on the rail with its end portion in use, moved from the edge of the rail foot in the direction of the rail web of the rail to be fastened , This ensures that the required holding force is always properly transmitted from the respective arm to the rail, when the rail due to the lateral forces occurring when driving over the rail and a potentially inaccurate lateral support on the support plate overly strong transverse to its longitudinal direction emotional. In addition, the displacement of the support area in the direction of the rail web causes a higher resistance to undesired rotation, whereby in particular the correct position mounting of the tension clamp is facilitated.

Practical experience with the above-explained system show that the secure holding of the rail is ensured by the angled shape of the end portions of the retaining arms of the tensioning clamp, even in the case of a larger transverse displacement. However, it is especially when the rail when passing through a Rail vehicle performs alternating, short transverse movements, to increased abrasive wear in the area of the surfaces in which the end portions of the support arms act on the rail of the rail to be fastened. In addition, although the special shape of the tensioning clamp used in the above-described known system proves advantageous in terms of maximum elasticity of the spring. However, it is difficult in this design to exert high spring forces on the rail with limited space and comparable limited clamping paths.

Against the background of the prior art explained above, the object of the invention was to provide a tensioning clamp and a system for fastening a rail in which, with further improved operational safety, the danger of excessive wear is reduced in the region in which the tensioning clamp acts on the rail to be fastened.

With regard to a tension clamp, this object has been achieved according to the invention in that such a tension clamp has the features specified in claim 1.

With regard to a system for fastening a rail, the solution according to the invention of the above-stated object is that such a system comprises a tensioning clamp designed according to the invention.

Advantageous embodiments of the invention are specified in the dependent claims and are explained below as the general inventive concept in detail.

A tensioning clamp according to the invention for fastening a rail has, in accordance with the prior art described above, a middle section, a torsion section extending laterally from the central section, at least one transition section adjoining the torsion section and at least one retaining arm connected to the transition section. In this case, the end portion of the holding arm associated with the free end of the holding arm is oriented angled away from the torsion portion in plan view.

According to the invention, a supporting region extending over the length of the end section is now formed on the angled end section of the holding arm. At the same time, according to the invention, the end section is angled with respect to the adjoining section of the support arm in such a way that, when the tension clamp is completely assembled, the support region rests linearly over its length on the associated surface of the rail foot of the rail to be fastened.

In a tension clamp according to the invention therefore the end portion present on the respective support arm is bent not only towards the rail web or away from the rail web in the direction of Torsionsabschnitts the tensioning clamp, but it is additionally created in the region of the respective end portion an enlarged support surface through which the at clamped tension clamp between rail and end section acting surface pressures are reduced. As a result, the risk of excessive wear on the rail between the rail and the tension clamp is minimized. The invention goes from the Acknowledgment that in the prior art described at the outset, strong incorporations occur in the area of the contact surface, because the contact surface is restricted there to a very small area, which is also positioned near the edge of the free end side of the end section. This risk does not exist when using a tension clamp according to the invention due to the fact that the respective end portion according to the invention is shaped so that it sits at a tensioned tension clamp substantially over its entire length on the surface of the rail foot of the rail to be fastened.

Since in this case there is line contact with the associated surface of the rail foot over the length of the contact area of the end clamp on the tension clamp, the friction surface which is essential for the frictional resistance opposing a transverse movement of the rail is at the same time however so small that the rail is required can move relative to the tension clamp and the other components of the fastening system according to the invention. Damage to the rail foot by incorporation of acting on the rail foot end of the clamp can be effectively prevented.

Another important practical advantage of the inventive design of a tensioning clamp is in combination with the other components of a system according to the invention that it by the present invention at the at least one end portion linear, elongated and over the entire length of the respective end portion extending contact surface easily is possible to regulate the Track width of a track formed using a rail mounted in accordance with the invention, one rail and to combine the same tension clamp with different width guide plates. The width of the guide plate is measured transversely to the longitudinal direction of the respective rail. By formed on the angled end portion of a tension clamp according to the invention elongated support surface is independent of the respective position of the guide plate ensures that the required hold-down forces are always dissuaded safely and with optimally distributed surface pressures on the rail.

Likewise, the inventive design of a tension clamp then acts when it comes as a result of wear to a displacement of the rail transversely to its longitudinal extent and relative to the guide plate on which the tension clamp is supported. The inventive long predetermined, linear bearing surface in the region of each acting on the rail end portion of the clamp is ensured that even then sufficient hold-down forces acting on the rail, if between the guide plate and rail due to wear a gap has formed, the is so great that acting on the rail foot end portion projects over a portion of its length over this gap.

It proves to be particularly advantageous in this context, when viewed in plan view of the tension clamp, the end portion is angled away from the torsion portion so that it is directed in the mounting position against the rail web of the rail to be fastened.

With such an orientation of the respective angled end portion is ensured with maximized hold-down force and minimized dimensions of the tension clamp that the required hold-down force is transmitted securely even with a no longer proper mounting position of rail, guide plate or clamp.

A further increase of the hold-down force with optimized fatigue strength of the tensioning clamp can be achieved by alternatively pointing the end portion in a plan view of the tensioning clamp facing away from the torsion portion so that it is directed away from the rail web of the rail to be fastened in the assembly position. In order for the respective end section, despite its orientation pointing to the torsion portion, to lie securely on the rail foot over the entire length of its contact surface, the at least one retaining arm of the tension clamp is at its end the respective end portion provided with a linear contact surface and aligned is formed, longer than in the variant of the invention described in the preceding paragraphs. This leads to a greater elasticity of the support arm and concomitantly to a less heavy load, with the result that its fatigue strength is increased. As a measure of the minimum length of the support arm while the smallest distance between the inventively constructed end portion and the associated torsion can be used. This distance should be greater than the smallest distance between the Torsionsabschnitt and a contact surface of the guide plate associated edge of the new state of a fully assembled, inventive system Rail foot. In this way, it is ensured that the end portion is always seated on the rail foot over a sufficient length, even with an inaccurate alignment of the rail foot and guide plate as a result of wear or assembly errors, in order to apply the required hold-down force.

The above summarized advantages of alignment and shaping of the end portion of a tensioning clamp according to the invention occur in particular when the length of the angled end portion corresponds to at least 20% of the length of Torsionsabschnitts.Die inventively given ready clamp tensioned linear support of the end portion on the associated rail can characterized be accomplished that the end portion with respect to the remaining portion of the support arm relative to the contact surface, taking into account the distortions associated with the distortion of the tension clamp deformations is arranged at such an angle that the end portion in the course of the bracing over its entire length to the surface of the rail foot applies.

Alternatively or additionally, the holding arm can be shaped so that it is only minimally deformed in the course of the bracing. This makes it possible to align the end portion of the support arm with respect to the rest of its portion from the outset so that it sits even with a relaxed tension clamp line on the surface of the rail foot. For this purpose, the shape and orientation of the support arm is chosen so that the arm largely serves only as a lever with low inherent elasticity, so that of the tension clamp in the tensioned state exerted spring force is generated substantially exclusively by torsion of Torsionsabschnitts. This can be achieved in that the holding arm is aligned with respect to the torsion portion so that the torsion portion and the holding arm in an overhead view of the tension clamp from above seen an angle of 80 ° - 110 °, in particular 85 ° - 95 ° , wherein in the context of manufacturing capabilities at 90 ° approximated included angle brings optimal results.

The stiffness of the support arm can be optimized by an arcuate portion of the support arm extends in a plane that penetrates the torsion at an angle of 80 ° - 100 °. In practice, this alignment of the arcuate portion of the support arm can be realized in that the transition portion between the support arm and the torsion portion describes a lying on a horizontal surface tension clamp upward arc, which comprises an angular range of 80 ° - 110 °. In an arcuate configuration of the relevant portion of the support arm of a tensioning clamp according to the invention, the support arm in side view in the region of this section on a bow or dome-shaped shape, is ensured by the fact that the support arm even under high resilient hold-down forces or in the case of a transverse displacement of the rail Maintains shape essentially unchanged. As a result, its end portion in the tensioned state at any time is optimally linear on the rail.

The concentration of the generation of the hold-down force on the torsion portion can be further assisted by including the center portion with the torsion portion at an angle of 80 ° -110 ° when viewed in plan. In this embodiment, and the central portion acts essentially exclusively as a lever for the torsion of the torsion without being resilient itself.

Tensioning clamps according to the invention can, like the tensioning clamps known from the prior art, be manufactured in one piece from a spring steel wire by forming a curved curve bent without a jump.

The storage and handling of a tensioning clamp according to the invention can be simplified in a conventional manner in that the distance between the free end of the angled end portion to the central portion is smaller than the smallest thickness of the central portion, Torsionsabschnitts, transition section, holding arms and end portion. In this way, it can be safely prevented that loosely clamped clamps interlock with each other.

Of course, a tensioning clamp according to the invention as the known tensioning clamps may be formed mirror-symmetrical by the central portion is formed loop-shaped and depart from it two oppositely oriented Torsionsabschnitte, to each of which a transition portion a holding arm is connected with an angled end portion. The tension clamp according to the invention then has a W or ω-shaped configuration.

The present invention sought concentration of the generation of the resilient hold-down force on the Torsionsabschnitt allows a particularly space-saving design of a tension clamp according to the invention. According to an advantageous embodiment of the invention, the length of the Torsionsarms is in each case so short dimensioned that the respective support arm is guided at least in sections above the guide plate.

According to a particularly advantageous embodiment of production technology of the invention, the end portion of the support arm is angled relative to the adjoining him portion of the support arm that the imaginary extension of the end portion in mounting position with the web of the rail forms an acute angle of less than 90 °. End sections shaped in this way can be produced particularly economically by conventional bending methods on the machines available in practice.

Fig. 1

den in Fig. 5 dargestellten Befestigungspunkt entlang der in Fig. 5 eingezeichneten Schnittlinie X-X;

Fig. 2

eine in dem in den Figuren 5 und 6 gezeigten System eingesetzte Spannklemme in einer Ansicht von vorne;

Fig. 3

die Spannklemme gemäß Fig. 2 in einer seitlichen Ansicht;

Fig. 4

die Spannklemme gemäß Fig. 2 in Draufsicht von oben;

Fig. 5

einen durch zwei Systeme zum Befestigen einer Schiene gebildeten Befestigungspunkt in Draufsicht;

Fig. 6

den Befestigungspunkt gemäß Fig. 5 in einer seitlichen, teilgeschnittenen Ansicht;

Fig. 7

eine alternative Ausführung einer Spannklemme in einer der Fig. 4 entsprechenden Draufsicht von oben.

The invention will be explained in more detail with reference to a drawing illustrating an exemplary embodiment. They show schematically:

Fig. 1

the in Fig. 5 illustrated attachment point along the in Fig. 5 drawn section line XX;

Fig. 2

one in which in the FIGS. 5 and 6 shown used tension clamp in a view from the front;

Fig. 3

the tension clamp according to Fig. 2 in a side view;

Fig. 4

the tension clamp according to Fig. 2 in plan view from above;

Fig. 5

an attachment point formed by two systems for securing a rail in plan view;

Fig. 6

the attachment point according to Fig. 5 in a lateral, partially sectioned view;

Fig. 7

an alternative embodiment of a tension clamp in one of Fig. 4 corresponding top view from above.

The integrally formed in a jump-curve curve of a spring steel wire formed clamps 1.50 for securing a formed on a here example, a concrete sleeper underground U supported rail S are designed mirror-symmetrically with respect to a normal to the footprint 2 of the ground U aligned plane N1. They each have a loop-like design, in plan view ( Fig. 4 ) U-shaped central portion 3, with two parallel and spaced apart aligned legs 4.5 and a leg connecting the 4.5 together, the rail foot F to be fastened rail S associated semi-circular connecting portion 6.

In each case one of the legs 4, 5 of the middle section 3 is connected in each case to a transition section 7, 8 which is bent through 90 °, and a respective torsion section 9, 10 which extends in the lateral direction. The torsion sections 9, 10 in this case point away in opposite directions from the middle section 3 and, viewed in plan view, in each case enclose an angle α of approximately 90 ° with the respectively assigned leg 4, 5 of the middle section.

At the ends of the torsion sections 9, 10 which are remote from the middle section 3, a further transition section 11, 12 is connected in each case, which, when the tensioning clamp 1, 5 'is located on its underside, Fig. 1 . 2 ) in a circular arc, which comprises an angle of about 90 °, leads upwards.

The transition portions 11,12 go at their end facing away from the respective torsion 9,10 each end in a holding arm 13,14, seen at the respective transition portion 11,12 connected portion 15,16 in plan view, each with the associated torsion 9,10 Angle β of about 90 °, so that they are aligned substantially parallel to the legs 4,5 of the central portion 3.

The center axis M of the respective section 15,16 of the support arms 13,14 accordingly runs in a plane N2, which is pierced by the common longitudinal axis L of the torsion 9,10 each at an angle of about 90 ° +/- 5 °. The sections 15,16 of the support arms 13,14 are bent in the manner of a dome strut and embrace an angular range of about 180 °.

At their end remote from the respective torsion section 9, 10, the sections 15, 16 of the holding arms 13, 14 each extend in an end section 19, 20 in each case through an approximately 90 ° in the direction of the central section 3 and downwards transition section 17, 18 ,

In the in the FIGS. 1 to 6 1, these end sections 19, 20 are angled away from the torsion sections 9, 10 relative to the respective transition section 17, 18 and the respective section 15, 16 of the retaining arms 13, 14. The angling and the length of the end portions 19, 20 are each selected so that the end portions 19, taking into account the length of the substantially parallel to the legs 4, 5 of the central portion 3 extending portions 15,16 of the support arms 13,14 20 on the one hand at a distance a to the connecting portion 6 of the central portion 3 ends, which is smaller than the smallest thickness d of the spring steel, from which the tension clamp 1 is bent, and on the other hand so aligned with respect to the respective portion 15,16, that the cross-sectionally substantially circular end portions 19,20 in the clamped state ( Fig. 1 ) with their over their entire length Le extending support surface 21,22 linearly rest on the top O of the rail foot F. The clear width of the existing between the central portion 3 and the end portions 19,20 distance is therefore so small that no other tensioning clamp 1 can pass through this distance.

For mounting the rail S on the substrate U, two identically constructed, mounted on opposite sides of the rail S systems S1, S2 are used, each having a tension clamp 1, a guide plate 23 and a as Clamping means for clamping the clamp 1 required clamping screw 24 include.

The guide plate 23 is formed in the embodiment described here in the manner of a conventional angled guide plate and has on its subsurface U associated underside on their measured in the longitudinal direction of the rail S width B extending paragraph, which is located in mounting position befindlicher guide plate 23 in a correspondingly shaped , in the underground U provided channel sits. In addition, in the assembly position, the guide plate 23 is supported in each case with its rear side facing away from the rail S on a shoulder likewise formed on the substrate U. At its rail F associated, opposite the rear side widened front side, the guide plate 23 each have a contact surface against which the rail foot F is supported with its longitudinal edge. From the rail S when driving over a not shown here rail vehicle resulting transverse forces are absorbed by the guide plate 23 and discharged into the substrate U.

Adjacent to its rear side, the guide plate 23 at its top in each case a parallel to the contact surface of the guide plate 23 extending groove and additional elements not shown here in detail for guiding the mounted on the guide plate 23 each tension clamp 1 and also not visible here, of the Upper side to the underground U leading through opening, through which the clamping screw 24 is inserted. The clamping screw 24 is in each case in screwed into the underground U, not visible here dowels screwed.

The arranged on the respective guide plate 23 tension clamp 1 sits with their Torsionsabschnitten 9,10 in the groove of the guide plate 23. The length Lt of Torsionsabschnitte 9,10 is each dimensioned so that the support arms 13,14 each above the guide plate 23 and at least over the widened, the rail F associated front portion of the guide plate are guided. The respectively occupied by the clamps 1 width is accordingly only slightly larger than the width B of the guide plates 23rd

At the same time, the length of the legs 4, 5 of the middle section 3 is dimensioned such that the tensioning clamp 1 can be seated in a preassembly position, although its already screwed in, but not yet fully tightened, in which its torsion sections 9, 10 move in the direction of the rear side of the guide plate 23 offset so far outside their assigned groove of the guide plate 23 are arranged so that the end portions 19,20 of the tension clamp 1 no longer protrude in the space provided for the rail S area. After the rail S has been positioned in the space provided between the guide plates 23 of the systems S1, S2, the clamping clamps 1 can then be pushed out of their preassembly position into the final assembly position, in which they are angled with their end sections 19 angled in the direction of the web G of the rail S , 20 line-shaped on the top O of the rail foot F rest. Subsequently, the respective clamping screw 24 is tightened. In this case, the central portion 3 of the clamps 1 each in the direction of the substrate U emotional. Since the retaining arms 13,14 are substantially rigidly supported on the rail foot F at the same time, in the course of tightening the tension clamps 1, essentially only their torsion sections 9, 10 are twisted. As a result, so high spring forces for elastic hold down the rail S are available. These are applied over a comparably large contact surface on the rail foot F, so that despite the increased hold-down forces the risk of abrasive wear in the region of contact between the tension clamp 1 and the rail foot F is minimized. In order to ensure the required flexibility of the support of the rail S also in the direction of the ground U, an elastic layer E can be provided between the rail F and the ground in a conventional manner.

If there is a shift of the rail S in the transverse direction Q relative to the tension clamps 1 as a result of wear or unfavorable operating conditions, the line-shaped contact is maintained and a sufficient hold-down force is still exerted on the rail foot F. This also applies even if the transverse displacement goes so far that the respective end sections 19, 20 no longer rest completely on the rail foot F. By the angled in the direction of the web alignment of the end portions 19,20, even in the case that a gap between the respective guide plate 23 and the rail, it is ensured that the end portion 19,20 bridges this gap and rests on the rail foot F. The linear contact surfaces 21, 22 make it possible, even in this situation, for the rail S to automatically move back to its starting position without being interrupted by a may be prevented from abutting a groove created by abrasive wear on the rail foot F wedging tension clamp.

At the in Fig. 7 shown tension clamp 50 are the end portions 19,20 relative to the respective transition portion 17,18 and the respective portion 15,16 of the support arms 13,14 in the direction of the respectively associated torsion portion 9,10 angled pointing so that they point away from the rail web G in the assembled position , Again, the bend and the length of the end portions 19,20, taking into account the length of the substantially parallel to the legs 4,5 of the central portion 3 extending portions 15,16 of the holding arms 13,14 selected so that the end portions 19,20 on the one hand at a distance a to the connecting portion 6 of the central portion 3 ends, which is smaller than the smallest thickness d of the spring steel, from which the tension clamp 50 is bent. At the same time, in the tensioning clamp 50, the length Lh of the holding arms 13, 14 measured transversely to the longitudinal extent of the rail and to the longitudinal axis L is such that the smallest distance w between the axially parallel to the longitudinal axis L extending respective torsion portion 9 in the new state with fully assembled system, 10 and the respective associated end portion 19,20 is greater than the distance v between the respective guide plate 23 associated edge of the rail foot F and the respective torsion portion 9,10 (the guide plate 23 and the rail F are in Fig. 7 for the sake of clarity only indicated by dashed lines). In this dimensioning of the holding arms 13,14 ensures that the end portions 19,20 angled despite their in the direction of the respective associated torsion 9,10 Form are supported at least in the new state over the entire length Le their respective bearing surface 21,22 on the rail foot F. If there is a shift of the rail S relative to the guide plate 23 as a result of wear, the end sections 19, 20 always remain supported on the rail foot F by way of a length sufficient for safe power transmission.

REFERENCE NUMBERS

1, 50

clamps

2

Upright surface of the underground U

3

Middle section of the respective clamp 1.50

4, 5

Legs of the respective clamp 1.50

6

Connecting portion of the central portion 3

7, 8

Transition portions of the respective tension clamp 1, 50th

9, 10

Torsionsabschnitte the respective clamp 1.50

11, 12

Transition sections of the respective tension clamp 1.50

13, 14

Retaining arms respective tensioning clamp 1.50

15, 16

Portions of the retaining arms respective tensioning clamp 1.50

17, 18

Transition sections respective clamp 1.50

19, 20

End sections of each tensioning clamp 1.50

21, 22

Support surface respective clamp 1.50

23

guide plates

24

turnbuckles

a

distance

B

Width of the guide plates 23

d

Thickness of the spring steel of the respective tensioning clamp 1.50

e

elastic situation

F

Rail foot of rail S

G

Footbridge of rail S

L

Longitudinal axis of the torsion 9,10

Le

Length of the end sections 19,20

Lt

Length of the torsion sections 9,10

lh

Length of the holding arms 13, 14

M

Central axis of the sections 15,16

N1

level

N2

level

O

Top of rail foot F

S

rail

S1, S2

Systems for fastening a rail

U

underground

w

smallest distance between the torsion arms 9,10 of the tensioning clamp 50 and their respective associated end portion 19,20

v

Distance between the torsion 9,10 of the tension clamp 50 and their respective associated edge of the rail foot

α

angle

β

angle

Claims (15)

1. Tensioning clamp for fastening a rail (S) with a centre portion (3), with at least one torsional portion (9, 10) branching off from the centre portion (3) in the lateral direction, with at least one transitional portion (7, 8) adjoining the torsional portion (9, 10) and with at least one holding arm (13, 14) which is connected to the transitional portion (7, 8) and the end portion (19, 20) of which holding arm associated with the free end of the holding arm (13, 14) is oriented bent in relation to the torsional portion (9, 10) viewed in a plan view of the tensioning clamp (1), characterised in that a bearing region (21, 22) extending over the length of the end portion (19, 20) is configured on the bent end portion (19, 20) of the holding arm (13, 14) and in that the end portion (19, 20) is bent in relation to a part piece (15, 16) of the holding arm (13, 14) adjoining it in such a way that when the tensioning clamp (1) is completely assembled, the bearing region (21, 22), over its entire length (Le), rests linearly on the associated surface (O) of the rail foot (F) of the rail (S) to be fastened.
2. Tensioning clamp according to claim 1, characterised in that the holding arm (13, 14) and the torsional portion (9, 10), viewed in a plan view, enclose an angle (α) of 80° to 110°.
3. Tensioning clamp according to claim 2, characterised in that the angle enclosed by the holding arm (13, 14) and the torsional portion (9, 10), viewed in plan view, is 85° to 95°.
4. Tensioning clamp according to any one of the preceding claims, characterised in that an arcuate part piece (15, 16) of the holding arm (13, 14) extends in a plane, which the torsional portion (9, 10) passes through at an angle of 80° to 100°.
5. Tensioning clamp according to any one of the preceding claims, characterised in that, viewed in a plan view, the centre portion (3) encloses an angle of 80° to 110° with the torsional portion (9, 10).
6. Tensioning clamp according to any one of the preceding claims, characterised in that the end portion (19, 20), viewed in a plan view of the tensioning clamp (1), is bent to point away from the torsional portion (9, 10) in such a way that it is directed, in the assembly position, toward the rail web (G) of the rail (S) to be fastened.
7. Tensioning clamp according to any one of the preceding claims, characterised in that the end portion (19, 20), viewed in a plan view of the tensioning clamp (1), is bent to point to the torsional portion (9, 10) in such a way that, in the assembly position, it points away from the rail web (G) of the rail (S) to be fastened.
8. Tensioning clamp according to any one of the preceding claims, characterised in that the length (Le) of the bent end portion (19, 20) corresponds to at least 20% of the length (Lt) of the torsional portion (9, 10).
9. Tensioning clamp according to any one of the preceding claims, characterised in that it forms a curved line bent in a step-free manner.
10. Tensioning clamp according to any one of the preceding claims, characterised in that the spacing (a) of the free end of the bent end portion (19, 20) from the centre portion (3) is smaller than the smallest thickness (D) of the centre portion (3), the torsional portion (9, 10), the transitional portion (11, 12), the holding arm (13, 14) and the end portion (19, 20).
11. Tensioning clamp according to any one of the preceding claims, characterised in that it is formed mirror-symmetrically, in that the centre portion (3) is formed in a loop shape and two torsional portions (9, 10) oriented in opposite directions to one another branch off from it, to which a respective holding arm (13, 14) with a respective bent end portion (19, 20) is connected by means of a respective transitional portion (11, 12).
12. System for fastening a rail (S), which has a rail foot (F), a web standing thereon and a rail head, with a guide plate, a tensioning clamp held on the guide plate and a tensioning means for bracing the tensioning clamp against a base supporting the rail, characterised in that the tensioning clamp is configured according to any one of claims 1 to 11.
13. System according to claim 12, characterised in that the length (Lt) of the torsional portion (9, 10) is in each case dimensioned such that the respective holding arm (13, 14), in the assembly position, is guided, at least in portions, above the guide plate (23).
14. System according to claim 12 or 13, characterised in that the bent end portion (19, 20) of the holding arm (13, 14) is bent in such a way that the imaginary extension of the end portion, in the assembly position, encloses an acute angle with the web (G) of the rail (S).
15. System according to any one of claims 12 to 14, characterised in that the smallest spacing (w) between the torsional portion (9, 10) and the end portion (19, 20) associated with it is greater than the smallest spacing (v) between the torsional portion (9, 10) and the edge of the rail foot (F) associated with a contact face (21, 22) of the guide plate (23).

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