KR102624843B1 - Surface Leakage Robust Insulator Section - Google Patents

Abstract

The invention relates to an insulator section (19) for insulating a first current track section (20) from a second current track section (21) extending along the direction of travel (1) of the train, ), an insulating body ( 26); - a first connection located at the beginning 38 of the insulating body 26 seen in the direction of travel 1 for connecting the insulating body 26 to the first current track section 20 interface(40,41); - a second connection located at the end 39 of the insulating body 26 seen in the direction of travel 1 for connecting the insulating body 26 to the second current track section 21 interface(41); - a contact surface (48) located on the bottom side (42) of the insulating body (26), visible in the height direction (9), for supporting the current collector (30) of the train; - a first insulating body side wall (51) defining the boundary of the insulating body (26) on one side in the transverse direction (11); - a second insulating body side wall (52) opposite the first insulating body side wall (51) and defining the boundary of the insulating body (26) as seen in the transverse direction (11); - 10 formed at the connection surface 48 towards the inside of the insulating body 26 with a groove section 53 extending from the first insulating body side wall 51 to the second insulating body side wall 52 A plurality of grooves 50 of more than The grooves in the grooves 50 are aligned with the starting portion 38 of the insulating body 26 as seen in the direction of travel 1, with an angle of inclination 54 higher than ° but lower than 180°. The walls 55 comprise a scraping edge 57 at the connecting surface 48 .

Description

Surface Leakage Robust Insulator Section

The invention relates to a section insulator for insulating a first current track section from a second current track section extending along the direction of travel of the train.

Such an insulator section is known from European patent document EP 0 052 176 B1.

The object of the present invention is to improve known insulator sections.

The above object is achieved by the features of the independent claims.

Useful embodiments are the subject of the dependent claims.

According to one aspect of the invention, an insulator section for insulating a first current track section from a second current track section extending along the direction of travel of the train, within said direction of travel, in a transverse direction perpendicular to said direction of travel. an insulating body extending in and in the transverse direction and in a height direction perpendicular to the direction of travel, the starting portion of the insulating body visible in the direction of travel for connecting the insulating body to the first current track section a first connection interface located at the end of the insulating body visible in the direction of travel for connecting the insulating body to the second current track section, a current collector of the train a connection surface located on the bottom side of the insulating body visible in the height direction for support, a first insulating body side wall defining a boundary of the insulating body on one side in the transverse direction, opposite to the first insulating body side wall a second insulating body sidewall defining the boundary of the insulating body as seen in the transverse direction, and a groove section extending from the first insulating body sidewall to the second insulating body sidewall at the connecting surface. It includes a plurality of grooves formed toward the inside of more than 10, wherein the groove section is higher than 140° but lower than 180° with respect to the running direction on at least one of the first insulating body sidewall and the second insulating body sidewall. The groove walls within the grooves have an inclination angle 54 and are aligned with the front side of the insulating body as seen in the direction of travel and comprise a scraping edge at the connecting surface.

The provided insulator section is based on the idea that surface leakage occurs due to wear deposits, such as coal dust, that electrically short-circuit the two current track sections. By having the scraping edge in the groove, the provided insulator section grinds the coal into the groove, while the groove resists ground abrasion at the relatively low inclination angle. send him out This removes the carbon dust from the bottom side of the insulating body and prevents the surface leakage.

In one embodiment of the provided insulator section, the inclination angle relative to at least one of the first insulating body sidewall and the second insulating body sidewall is greater than 155° but less than 165°, preferably greater than 150° but less than 160°. low and most preferably 155°. With this value for the inclination angle, the grooves will reliably remove the ground wear material. On the other hand, the grooves will not prevent the ground wear material from leaving the groove for long.

In another embodiment of the provided insulator section, the average value of the inclination angle of the groove section between the first insulating body sidewall and the second insulating body sidewall is higher than 140° but lower than 180°, preferably higher than 150°. lower than 177.5° and most preferably 155°. The groove section may therefore not be linear, but may also be partially annular, tapered or similar.

In a further embodiment of the provided insulator section, the ratio between the area of the contact surface covered by the grooves and the remaining area of the contact surface is between 1:2 and 1:4, preferably 1:3. Thereby, a high grinding effect will be achieved.

In a preferred embodiment of the provided insulator section, the grooves are machined into the insulating body. This allows efficient production of the insulating body with sharp scraping edges.

In a further alternative embodiment of the provided insulator section, the number of grooves is at least 10, preferably at least 20 and most preferably at least 25 per meter along the direction of travel, which will further increase the grinding effect.

In another embodiment of the provided insulator section, the ratio of the depth of the grooves as seen in the height direction and the depth as seen between its groove sidewalls in one of the grooves is between 1:2 and 2:1, preferably Preferably 1:1, which will also increase the grinding efficiency.

In a further embodiment of the provided insulator section, the groove wall with the scraping edge is at an angle between 70° and 110°, preferably between 80° and 100° and most preferably at 90° relative to the floor surface. May include wall inclination angle. Thereby, the ground wear material will be effectively expelled from the grinding location and will not fill the groove.

It is not necessary for each groove to include a scraping edge at the connecting surface, but it is desirable to provide one scraping edge per groove to obtain a high grinding effect.

In a further alternative embodiment of the provided insulator section, the grooves are filled with air, through which the ground wear material can be discharged to the outside.

In another embodiment of the insulator section, the ratio of the width of the insulating body as seen in the transverse direction and the width of the grooves as seen at their groove side walls is 2.5 or more, preferably 3 or more. . Thereby, the high density of the grooves can lead not only to a high grinding effect but also to lead the potential leakage current to a longer path.

In a further embodiment of the insulator section, the insulating body is made of a material having a lower hardness than the material of the current collector. By this, the current collector will be protected from wear and tear thanks to the grinding idea behind the invention.

According to the insulator section of the present invention, the groove has a scraping edge, so that the insulator section grinds the carbon powder and puts it into the groove, and the groove discharges the ground wear material at a relatively low inclination angle to the outside from the bottom side of the insulating body. By removing carbon dust, surface leakage can be prevented.

The features, characteristics and advantages of the present invention described above and the methods and methods for realizing them will become clearer through the description of the embodiments below with reference to the attached drawings.
1 is a schematic diagram of a rail track for a train;
Figure 2 is a schematic plan view of the insulator section for the rail track of Figure 1;
Figures 3a to 3c are three plan projections of the insulating body in the insulator section of Figure 2;
Figure 4a is a cutaway cross-sectional view of a detail within the insulating body of Figures 3a to 3c;
Figure 4b is a perspective view of the insulating body of Figures 3a to 3c;
5A to 5F are examples of groove sections in the insulating body of FIGS. 3A to 3C;
FIGS. 6A to 6F are examples of groove sections in the insulating body of FIGS. 3A to 3C.

In the drawings, identical technical elements are indicated with the same number and are described only once. The drawings are merely conceptual and do not necessarily reflect actual geometric proportions, unless otherwise stated in the description.

Reference is made to Figure 1 which shows a rail track (2) comprising rails (3) and extending along the direction of travel (1), on which an electrically driven train can be guided and travel. For the power supply to the train, a catenary (4) is also provided at an unnumbered height on the track (3) extending along the direction of travel (1). The train can take power from the suspension cable 4 in a known way by means of a current collector.

The suspension ropes 4 are held on the carrier, which is exemplarily visualized in FIG. 1 in the form of a ceiling 5 . The ceiling 5 may be part of a tunnel or bridge. The suspension rope (4) is held on the ceiling (5) within the carrier gap (6).

Figure 1 further shows the profile 7 of the suspension cord 4 in an enlarged manner.

As shown in profile (7), the suspension cord (4) is formed axisymmetrically about the profile axis (8). There, the profile axis 8 extends parallel to the height direction 9 of the rail track 2. When viewed in the height direction 9, there is a transverse arm 10 on the upper side of the suspension cable 4, from which two tensioning arms 12 move against the height direction 9 and It extends in a transverse direction 11 which extends perpendicular to direction 1 and perpendicular to height direction 9. A clamping arm 13 is attached to the end of each tensioning arm 12 opposite the transverse arm 10, and the connecting wire 14 can be maintained between them by the tensioning arms 12.

The suspension line 4 shown in Figure 1 typically consists of a plurality of suspension sections, which are fastened against each other and with respect to each other exactly as shown in profile 7 in Figure 1. It is held in place by splice plates, 15). Correct positioning is defined by the form fits between the suspension sections and the connection sills 15, which in FIG. 1 are implemented with tongue/groove-connections 16. In order to fasten the individual suspension segments to each other, screws 17 can be screwed into the connecting braces 15 .

In order to easily insert the connecting wire 14 between the clamping arms 13, sliding grooves 18 extend in the connection between the clamping arms 13 and the tensioning arms 12, respectively, against the transverse direction 11. However, a threading trolly (not shown) can move on it. Since inserting the connecting wire 14 between the clamping arms 13 is not necessary to understand the present invention, further explanation is omitted here.

Reference is made to Figure 2, which shows the insulator section 19 in a schematic plan view constructed axially symmetrical about the axis of symmetry 33.

It is known to divide the connecting wire 14 from Figure 1 into electrically different sections, where the train mentioned above must consequently be able to pass through the electrically separated points. The insulator section 19 shown in FIG. 2 connects the suspension wire 4 of the first wire segment 20 to the suspension wire 4 of the second wire segment 21 .

When viewed in the running direction (1), the insulator section (19) has an input edge (23) and an output edge (24) located opposite to the first connection edge (23) when viewed in the running direction (1). It has a first connection facility (22). The input edge 23 and the output edge 24 are connected to each other as side edges 25. In the top view shown against the height direction 9, the first connection device 22 has a basically triangular or trapezoidal shape.

The suspension cable (4) of the first wire section is connected to the input edge (23) of the first connection facility (22). The connecting wire 14 , which is guided through the suspension wire 4 of the first wire section 20 , is guided into the section of the first connecting device 22 . To the output edges 24 , additional catenary cords 4 are connected, which are spaced apart from each other and arranged parallel to each other when viewed in the transverse direction 11 . For each of the suspension lines 4 connected to the output edge 24 of the first connection device 22, an insulating body 26 is connected, which has a displacement 27 relative to each other when viewed in the direction of travel 1. ), the insulating bodies on both sides are located. Each insulating body 26 is in turn connected to a suspension cord 4 , where each of these suspension cords 4 is in turn connected to an insulating body 26 . To these insulating bodies 26 , additional suspension lines 4 are connected and they are then connected to the output edge 24 of the second connection facility 28 . Since the insulating body 26 is formed axially symmetrical with respect to the symmetry axis 33, the second connection facility 28 is also formed axially symmetrical with respect to the first connection facility 22 with respect to the symmetry axis 33. do. To the input edge 23 of the second connection facility 28 the catenary wire 4 of the second wire segment 21 is finally connected.

Below the connection facilities 22, 28 when viewed in the height direction 9, the connection wires are guided into the area of each side edge 25, where these connection wires are held by the suspension lines 4. To clearly distinguish them from the connection wires 14, they are named connection wires 29. Connecting wires 29 are indicated as dotted lines in FIG. 2 . Also the connecting wires 14 in the suspension line 4 are indicated as dotted lines in FIG. 2 . Since the insulator section 19 comprises two insulating bodies 26 on each path between the two connection facilities 22, 28, the suspension lines 4 between the insulating bodies 26 are essentially electrical. It is neutral.

When the train passes the insulator section 19, its current collector 30, indicated by dashed lines in Figure 2, will enter the insulator section 19 in the direction of travel 1. When the current collector 30 reaches the first of the insulating bodies 26, the electrical connection of the current collector 30 to the first wire segment 20 is such that the current collector 30 reaches the first of the insulating bodies 26. It will remain until the second one is reached. Within the zone of first displacement 27 , the current collector 30 is still electrically connected to the first conductor sections 20 . After leaving the second insulating body 26, the current collector 30 is not electrically connected to any of the wire segments 20,21. When passing through the third of the insulating bodies 26 of the current collector 30, he will come into contact with the second wire segment 21, so that when he moves further in the direction of travel he is connected by the second wire segment 21. There will be a sudden surge in power.

The insulator section 19 ensures that there is no electrical connection between the first and second conductor sections 20, 21, so that the two conductor sections 20, 21 can provide different power supply voltages.

The insulator section 19 as previously described is merely an example. It is usually sufficient to separate the two conductor segments 20, 21 with one single insulator section 26. However, the previously described insulator section 19 provides the advantage of potential equalization, which would not be possible if only one single insulator section 19 was used. The need to implement potential equalization depends on the application.

Independent of the configuration of the insulator section, in order to ensure that the first and second wire sections 20, 21 maintain electrical insulation from each other, the first and second wire sections 20, 21 are subject to wear and tear. There should be no electrical shorting against each other, which may occur due to abrasive substances such as carbon dust distributed on the wire sections 20, 21 and the insulating bodies 26 by the current collector 30.

In order to reduce the distribution of wear materials and thus the risk of electrical short-circuits, the insulating bodies 26 are specially designed, which shows the form of a three-panel projection of the insulating bodies 26 in the insulator section 19 in Figure 2. It will be explained below based on FIGS. 3A to 3C. In the direction of travel 1 , the insulating body 26 is depicted in a reduced manner by broken lines 34 .

Although the insulating body is described based on the insulator section 19 in Figure 2, any suitable insulator section may be used, such as the insulator section according to International Patent Publication WO 2012/065663 A2. Alternatively, the insulator section may consist solely of the insulating body 26 itself.

The insulating body 26 has a maximum length extension 35 in the direction of travel that is exemplarily 1170 mm, a maximum transverse extension 36 in the transverse direction that is exemplarily 15 mm, and a maximum height in the height direction that is exemplarily 90 mm. It has an extension (37).

When viewed in the direction of travel 1 , the insulating body 26 comprises a starting or front wall 38 at the front and an ending wall 39 opposite the front wall 38 . On the side of the front wall 38 away from the front wall 38 when viewed in the direction of travel 1, there are seating holes 40 and fastening holes 41, through which the insulating body 26 is provided. It can be secured to one of the suspension ropes (4) within the insulator section (19). In it, the position of the insulating body 26 relative to the suspension cable 4 is defined by the form fits defined by the seating holes 40, while he is inserted through the fixing hole 41. It is fixed to the suspension cable (4) by a force fit such as a possible screw. Additional fixing holes 41 are provided at a distance therefrom in the end wall 39 when viewed in the direction of travel 1.

As mentioned above as a technical possibility, if the insulating body 26 can be used alone as an insulator section, then the seating holes 40 and the fastening holes 41 in the front wall 38 can be used for the first current rail ( It will act directly as a first connection interface connecting the insulating body 26 to the second current rail 20 , while the additional fastening hole 41 in the end wall 29 connects the insulating body 26 to the second current rail 21 ) will directly act as a second connection interface for connecting. Alternatively, if the insulating body 26 is more complex, as illustrated in Figure 2, the connection interfaces will include additional technical elements. For the insulator section 19, connection facilities 22, 28 serve as connection interfaces.

When viewed in the height direction 9, the insulating body 26 includes a bottom side 42 at the lower end and an upper side 43 opposite the bottom side 42. At the bottom side 42, the insulating body 26 has a first receiving edge 44 and an end wall 39 starting from the front wall 38 when viewed in the direction of travel 1 and extending in the direction of travel 1. and a second receiving edge 45 starting from and extending against the direction of travel 1. Both receiving edges 44,45 start from their respective walls 38,39 and also extend against the height direction 9 and thus, when entering the area of the insulating body 26, strike the current collector 30. It is possible to ensure that there are no edges that can be heeled. The first receiving edge 44 will have a first receiving length 46 of 74 mm, while the second receiving edge 45 will have a second receiving length 47 of 80 mm.

The edge at the bottom side 42 between the two receiving edges 44, 45 is called the connecting edge 48, at which the current collector 30 passes through the insulating body 26. will be mechanically connected to. It has a connection length 49 of approximately 1000 mm. While the current collector 30 is in mechanical contact with the insulating body 26, the current collector 30 will not have any electrical connection to both suspension cords 4 into which the insulating body 26 is inserted.

However, due to wear materials, the above-mentioned requirements will not always be met, since wear materials such as carbon dust are electrically conductive and can short-circuit both suspension lines 4 via the connecting edge 48. Because. To reduce the risk of electrical short-circuiting, the leakage path is extended by 29 grooves 50 machined into the bottom side 42 against the height direction. The number of grooves 50 is at least 10, preferably at least 20 and most preferably at least 25 per meter along the direction of travel 1.

The grooves 50 are positioned parallel to each other, where each groove extends from the first insulating body side wall 51 when viewed in the transverse direction 11 to a second insulating body opposite to the first insulating body side wall 51 . It has a groove section 53 extending to the side wall 52, wherein the insulating body side walls 51, 52 limit the insulating body 26 in the transverse direction 11 and the first insulating body side wall 51 is the first insulating body side wall 51. 2 Located before the insulating body side wall (52). Grooves 50 are open on both insulating body side walls 51 and 52.

The groove section 53 of each groove 50 can be basically formed arbitrarily, but has two limitations.

As a first limitation, each groove section 53 has an inclination angle 54 higher than 140° but lower than 180° with respect to the direction of travel 1 at the first insulating body side wall 51 or at the second insulating body side wall 52. ) has. In this embodiment, the inclination angle 54 of the groove section on the first insulating body side wall 51 with respect to the traveling direction 1 is substantially 155°.

The second limiting event relates to groove walls. Each groove has, when viewed from the direction of travel 1, a front groove wall 55 aligned against the direction of travel 1 and a rear groove wall 56 aligned within the direction of travel 1. He is indicated in FIG. 3B, where not all front and rear groove walls 55,56 are indicated with unique reference numbers for completeness.

The front groove wall 55 of each groove 50 forms a scraping edge 57 on the bottom side 42 of the insulating body 26 together with the bottom side 42 of the insulating body 26. is aligned on the front side of the groove 50 when viewed in the direction of travel 1. This scraping edge 57 is visualized by a cut diagram 58 along the groove section 53 partially visualized in FIG. 4A .

Each groove 50 has a groove width 59 of 5 mm and a groove height 60 of 5 mm. The groove walls 55, 56 of the grooves 50 are spaced apart from each other by 5 mm, and the front groove wall 55 of one groove 50 is 10 when viewed in the direction of the cut sight 58. They are spaced relative to the rear groove wall 56 of the grooves 50 which run continuously at mm intervals.

In other words, there is an area on the connecting edge 47 that is covered by the grooves 50 . The ratio of this area to the remaining area on the connection edge 48 is approximately 1:2.

When the current collector 30 passes through the bottom side 42 of the insulating body 26, the scraping edge 57 of the grooves 50 grinds abrasive materials such as carbon powder into the grooves 50. . The coal powder already in the grooves 50 will be pushed out along the groove section 53 by the coal powder that is subsequently ground. Thereby, the carbon dust can be discharged from the grinding area and excessive accumulation of carbon dust in the groove can be prevented.

Figure 4b shows a perspective view of the insulating body 26.

Reference will now be made to Figures 5A and 5B, which show a portion of the bottom side 42 of the insulating body 26 in an alternative embodiment. Basically, the inclination angle 54 can be chosen arbitrarily, as long as it is below 140° and 180°. The difference between FIGS. 5A and 5B is that the inclination angle 54 in FIG. 5A is lower than in FIG. 5B. If the inclination angle 54 is higher, that is, if the groove section 53 is inclined more non-parallel to the direction of travel, the pressing force will be higher, and the coal powder that follows in succession will use that force to separate the coal powder already present in the individual grooves 50. will be pushed out of it. Therefore, the absolute value of the inclination angle 54 should be selected as high as possible. However, as the inclination angle 54 becomes higher, the individual grooves 50 will become longer. This means that within the individual grooves 50 the coal will have a longer path to escape from it, so the inclination angle 54 cannot be selected to be arbitrarily small. Good results have been achieved at inclination angles 54 higher than 155° but lower than 165°, preferably higher than 150° but lower than 160°.

The inclination angle 54 also need not be constant on the transverse direction 11 . It can vary as a sharp kink 61 as shown in FIGS. 5C and 5D, which also need not be mathematically constant. Alternatively, as shown in FIGS. 5E and 5F, the tilt angle 54 can be varied mathematically constant without any twist 61. In all cases, the average value of the inclination angle 54 of the groove section 53 must be selected dependent on the ranges described above for the preceding inclination angle 54 in the side walls 51,52, i.e. less than 140°. It is higher but lower than 180°, preferably higher than 150° but lower than 177.5°. 3A and 5A, tilt angle 54 consistently results in an average tilt angle of 155°. In Figure 3b, the average slope is individually higher.

However, if the groove section 53 has a maximum when viewed on the transverse direction 11 as in FIGS. 5c to 5e, then the average value does not fall outside the previously mentioned range for the average value of the inclination angle 54. Nevertheless, when viewed in the transverse direction 11, the above-mentioned inclination angle 54 must be satisfied from the maximum to the left and right respectively.

Now, the groove walls 55 and 56 will be described in more detail with reference to FIGS. 6A to 6F. These figures show an exemplary embodiment of the grooves 50 in cross-section.

The first groove wall 55 with a scraping edge 57 has an angle of inclination 62 at the scraping edge 57 with respect to the floor surface 42 , in particular to the connecting surface 48 . The inclination angle 62 is selected so that the aforementioned wear material is effectively ground. Good results have been achieved with an inclination angle 62 of 70° to 110°, preferably 80° to 100° and preferably 90°. In Figures 6a, 6b, 6d, 6e and 6f, the tilt angle 62 is approximately 90°, while in Figure 6c a value of approximately 75° is chosen as the tilt angle.

In this embodiment the grooves 50 are filled with air to allow the aforementioned wear material to push out the air and enter the grooves 50 .

In this embodiment the groove width 59 is 5 mm and the maximum transverse extension 36 of the insulating body 26 is 15 mm, so the ratio between the width 36 of the insulating body 26 and the groove width 59 is 3. . This ratio should preferably be chosen to be at least 2.5.

The material of the insulating body 26 is plastic. Since the current collector 30 is made of metal to conduct current from the connecting wire 14, the plastic of the insulating body 26 prevents the current collector 30 from being damaged when scraping carbon dust. do. Basically, the material of the insulating body 26 can be selected arbitrarily. However, the material must be selected to have a lower hardness than the material of the current collector 30.

Claims (14)

An insulator section (19) for insulating the first current track section (20) from the second current track section (21) extending along the direction of travel (1) of the train,
- within the direction of travel (1), within the transverse direction (11) perpendicular to the direction of travel (1) and within the height direction (9) perpendicular to the transverse direction (11) and the direction of travel (1). an insulating body (26) extending from;
- a first connection interface located at the beginning 38 of the insulating body 26 visible in the direction of travel 1 for connecting the insulating body 26 to the first current track section 20 (40,41);
- a second connection interface located at the end 39 of the insulating body 26 visible in the direction of travel 1 for connecting the insulating body 26 to the second current track section 21 (41);
- a contact surface (48) located on the bottom side (42) of the insulating body (26), visible in the height direction (9), for supporting the current collector (30) of the train;
- a first insulating body side wall (51) defining the boundary of the insulating body (26) on one side in the transverse direction (11);
- a second insulating body side wall (52) opposing the first insulating body side wall (51) and defining the boundary of the insulating body (26) seen in the transverse direction (11);
- 10 formed at the connecting surface 48 towards the inside of the insulating body 26 with a groove section 53 extending from the first insulating body side wall 51 to the second insulating body side wall 52 A plurality of grooves 50 of more than Groove walls ( Insulator section (19) 55 comprises a scraping edge (57) at the connection surface (48).
According to paragraph 1,
The inclination angle (54) with respect to at least one of the first insulating body sidewall (51) and the second insulating body sidewall (52) is greater than 155° but less than 165°.
According to claim 1 or 2,
The average value of the inclination angle 54 of the groove section 53 between the first insulating body side wall 51 and the second insulating body side wall 52 is higher than 140° but lower than 180°. .
According to claim 1 or 2,
The ratio between the area of the connecting surface (48) covered by the grooves (50) and the remaining area (61) of the connecting surface (48) is between 1:2 and 1:4.
According to claim 1 or 2,
Insulator section (19), wherein the grooves (50) are machined into the insulating body (26).
According to claim 1 or 2,
Insulator section (19), wherein the number of grooves (50) is at least 25 per meter along the direction of travel (1).
According to claim 1 or 2,
The ratio of the depth 60 of the grooves 50 as seen in the height direction 9 and the width 59 as seen between its groove side walls 55, 56 in one of the grooves 50 is Between 1:2 and 2:1, insulator section (19).
According to claim 1 or 2,
Insulator section (19), wherein each groove (50) includes a scraping edge (57) at the mating surface (48).
According to clause 8,
Insulator section (19), wherein the groove wall (55) with the scraping edge (57) comprises a wall inclination angle (62) between 70° and 110° relative to the connecting surface (48).
According to claim 1 or 2,
The grooves 50 are filled with air in the insulator section 19.
According to claim 1 or 2,
The ratio of the width 36 of the insulating body 26 seen in the transverse direction 11 to the width 59 of the grooves 50 viewed from its groove side walls 55, 56 is 2.5. , insulator section (19).
According to claim 1 or 2,
The insulating body (26) is made of a material having a lower hardness than the material of the current collector (30).
According to clause 12,
Insulator section (19), the material being plastic. According to claim 1 or 2,
The front groove wall 55 of each groove 50 forms the scraping edge 57 on the bottom side 42 of the insulating body 26 together with the bottom side 42 in the running direction 1 ), so that the scraping edge (57) is aligned with the start (38) of the groove (50) when viewed in the insulator section (19).