Device for compensating for length variations of a conductor rail

Abstract

The invention relates to a device for compensating length changes of a conductor rail, which extends in a travel direction of a rail vehicle and comprises a front conductor rail section in the travel direction and a rear conductor rail section behind the front conductor rail section in the travel direction, the device comprising a first carrier part, which is connectable to the front conductor rail section and has a guide slot side extending in the travel direction, a guide slot being formed in the guide slot side, a second carrier part, which is connected to the rear conductor rail section, is arranged next to the first sliding part in a transverse direction at right angles to the travel direction, has a guide slot side which abuts against the guide slot side of the first sliding part. A guide slot extending in the travel direction is also formed in the guide slot side of the second carrier part, in the travel direction a rear positive locking element abutting against the guide slot of the first carrier part and a front positive locking element abutting against the guide slot of the second carrier part are located next to one another, the positive locking elements engaging in the guide slot of the other carrier part in the transverse direction, respectively.

Description

Technical Field

[0001] This invention relates to a device for compensating for changes in the length of a conductive rail. Background Technology

[0002] EP 3260326A1 is a known device for compensating for changes in the length of a conductive rail. Summary of the Invention

[0003] One object of the present invention is to improve known devices.

[0004] According to one aspect of the invention, a device for compensating for length variations of a conductive rail, the conductive rail extending in the travel direction of a rail vehicle and including a front conductive rail portion viewed in the travel direction and a rear conductive rail portion located behind the front conductive rail portion in the travel direction, the device including a first support portion connected to the front conductive rail portion and having a guide groove side portion extending in the travel direction, wherein a guide groove is formed in the guide groove side portion; and a second support portion connected to the rear conductive rail portion, arranged adjacent to the first support portion in a transverse direction perpendicular to the travel direction, and having a guide groove side portion abutting against the guide groove side portion of the first support portion, wherein a guide groove extending in the travel direction is also formed in the guide groove side portion of the second support portion, a rear locking element is adjacent to the rear of the guide groove of the first support portion in the travel direction, and a front locking element is adjacent to the front of the guide groove of the second support portion, the locking elements engaging in the guide grooves of the other support portion in the transverse direction respectively.

[0005] Compared to the device mentioned at the beginning, the specified device is based on the concept that the two support parts might separate if they are pulled far enough away from each other. To avoid this problem, the locking element is used not only for lateral locking but also for mutual locking in the direction of travel. In this way, the relative movement path of the two support parts relative to each other is limited, and their accidental separation is effectively prevented.

[0006] In the specified embodiment of the device, the locking element is arranged at the opposite end of the bearing portion along the direction of travel. In this way, the maximum length variation compensation path is obtained before the two bearing portions abut against each other.

[0007] In another embodiment of the specified device, the locking element is designed as a sliding guide element that is held in the guide groove in the lateral direction. In this way, the locking element can be manufactured independently of the rest of the support portion without requiring a complex manufacturing process.

[0008] In a specific embodiment of the designated device, the rear sliding guide element is held immovably in the guide groove of the first bearing portion in the lateral direction, and the front sliding guide element is held immovably in the guide groove of the second bearing portion in the lateral direction. This can be achieved by material locking, such as by welding or gluing; by friction locking, such as by wedging; by press-fitting, such as by locking pins; or a combination thereof.

[0009] In a preferred embodiment of the specified device, the sliding guide element has a cross-section with a double-T shaped profile. In this way, the two support portions can be uniformly constructed in a symmetrical manner relative to each other, thus reducing manufacturing costs.

[0010] In yet another embodiment of the specified device, each carrier's guide groove has a press-fit region for press-fitting with a locking element of the corresponding other carrier, and each press-fit region has an interruption along the travel direction. In this way, an opening is created through which impurities accumulated in the guide groove can be removed.

[0011] In another embodiment of the specified device, in each bearing section, the guide groove is recessed against the height direction in the region of the interruption section, the height direction being perpendicular to the lateral direction and perpendicular to the travel direction. In this way, the remaining residue of the accumulated impurities can accumulate below the slide of the locking element and thus not interfere with the sliding guide rail.

[0012] In a particularly preferred embodiment of the specified device, the interruption portion in each carrier is shorter than the locking element engaged in the corresponding guide groove, so as to prevent the locking element from accidentally disengaging from the corresponding other carrier.

[0013] In another embodiment of the specified device, the locking element is mounted to slide within a guide groove. In this way, the device can be provided in a low-maintenance, robust, and cost-effective manner.

[0014] In another embodiment of the specified device, each carrier includes two guide slots stacked vertically along a height direction, which is perpendicular to the travel direction and perpendicular to the lateral direction.

[0015] According to another aspect of the invention, an apparatus for compensating for length variations of a conductive rail extending in the direction of travel of a rail vehicle, and including a front conductive rail portion viewed along the direction of travel and a rear conductive rail portion viewed behind the front conductive rail portion in the direction of travel, the apparatus comprising: a first support portion connected to the front conductive rail portion and having a guide groove side portion in which a guide groove extending in the direction of travel is formed; A second support portion, connected to the rear conductive rail portion, is arranged adjacent to the first support portion in a transverse direction perpendicular to the travel direction, and has a locking element that engages in a guide groove in the first support portion in the transverse direction. A first conductive rod is mounted on the first support portion in a height direction perpendicular to both the travel direction and the transverse direction, and is electrically connected to the first support portion. A second conductive rod is disposed on the second support portion in a direction opposite to the height direction and is electrically connected to the second support portion. At least one sliding sleeve is disposed on the first conductive rod in a sliding and conductive manner along the travel direction, and is electrically connected to the second conductive rod. The sliding sleeve is loosely mounted on the first support portion in a direction opposite to the height direction via a mechanical contact element.

[0016] Compared to the device mentioned at the beginning, a gap extending in the height direction is discernibly formed between the support portion and the sliding sleeve that moves relative to the support portion. The specified device closes this gap and thus prevents sparks, which could damage the device and impair its functionality over time.

[0017] In a specific embodiment of the specified device, the mechanical contact element comprises an electrically insulating material, and thus prevents unspecified currents that could cause thermal deformation and potentially functional damage.

[0018] In a preferred embodiment of the specified device, the mechanism operates in a locking manner along the direction of travel and is inserted into the sliding sleeve in the height direction, thus allowing it to be replaced particularly easily for maintenance purposes.

[0019] In another embodiment of the specified device, the mechanical contact element protrudes toward the sliding sleeve, thus ensuring low mechanical contact resistance and proximity to the function of the device at the gaps in the device mentioned at the beginning. Attached Figure Description

[0020] The properties, features, and advantages of the present invention described above, and the ways in which they are implemented, will become clearer with reference to the following description of embodiments, which are explained in more detail with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of a rail segment of a rail vehicle with conductive rails and a device for compensating for changes in the length of the conductive rails. Figure 2 yes Figure 1 A perspective view of the conductive rails; Figure 3 yes Figure 1 A perspective view of the support portion of the device used to compensate for changes in the length of the conductive rail; Figure 4 yes Figure 1 A perspective view of the slider of a device used to compensate for changes in the length of a conductive rail; Figure 5a yes Figure 1 A perspective view of the first part of the sliding sleeve of the device for compensating for changes in the length of the conductive rail. Figure 5b yes Figure 1 A perspective view of the second part of the sliding sleeve of the device for compensating for changes in the length of the conductive rail; Figure 5c It is assembly Figure 5a and 5b The two parts form a perspective view of the sliding sleeve; Figure 5d yes Figure 1 A cross-sectional view of the sliding sleeve of a device for compensating for changes in the length of a conductive rail. Figure 6 yes Figure 1 A perspective view of a device used to compensate for changes in the length of a conductive rail; Figure 7 It has Figure 6 A device for compensating for changes in the length of a conductive rail. Figure 1 A perspective view of a section of a railway track; Figure 8 Shown in sectional view Figure 7 A section of the railway track; Figure 9 It has a selectable device for compensating for changes in the length of the conductive rail. Figure 7 A perspective view of a section of the railway track.

[0021] In the accompanying drawings, the same technical features are given the same reference numerals and are described only once. The drawings are purely schematic and do not reflect actual geometric scale. Detailed Implementation

[0022] refer to Figure 1 , Figure 1 The rail segment 1 of a rail vehicle (not shown) is shown. The rail segment 1 includes rails 2 extending along the direction of travel 3 (also known as the longitudinal direction) of the rail vehicle and in the opposite direction of travel, along a transverse direction 4 perpendicular to the direction of travel 3, including two parallel tracks 5 extending from each other.

[0023] Viewed from a direction perpendicular to both the direction of travel 3 and the horizontal direction 4, the conductive rail 7 extends above the rail 2 in the vertical direction 6. Viewed against the direction of travel 3, the conductive rail 7 includes a first conductive rail portion 8, a second conductive rail portion 9, and a third conductive rail portion 10 arranged in a row.

[0024] The rail vehicle is thus guided by the rail 2 in the direction of travel 3 or against the direction of travel 3 and obtains the electrical energy required for propulsion from the conductive rail 7 via a pantograph. For this purpose, the first conductive rail section 8 and the third conductive rail section 10 are connected to the power supply 11.

[0025] The lengths of conductive rail sections 8, 9, and 10 of conductive rail 7 changed due to temperature fluctuations. Figure 1 The reference numeral 12 is used to refer to this change. To compensate for these length changes 12, the conductive rail 7 includes a device 13, which will be discussed in detail below. At the location of the device 13 for compensating for the length changes 12, the conductive rail portions 8 and 9 are functionally electrically isolated from each other, allowing the length changes 12 to be compensated with minimal mechanical stress. However, in principle, the two conductive rail portions 8 and 9 can transfer current to each other at this point.

[0026] This is not the case for segmented insulator 14, along... Figure 1 Observing from the direction of travel 3, the segment insulator 14 is arranged in front of the device 13 for compensating for the length variation 12. The segment insulator 14 is used, for example, to disconnect the power in the area of ​​the conductive rail 7 for maintenance and repair work, and to ensure the safety of personnel in the area. Therefore, the relevant conductive rail sections 9 and 10 must not carry any current to each other at this point.

[0027] To avoid providing a separate power supply 11 for the second conductive rail section 9, power transmission needs to be carried out at the device 13 used to compensate for length changes, which will be explained in detail below.

[0028] However, before that, it will be based on Figure 2 Refer to section 8 of the first conductive rail for a detailed explanation of the structure of conductive rail 7.

[0029] The conductive rail 7 is suspended from the support portion 15, which, as an example, is designed as a tunnel roof. As an example, the conductive rail 7 is suspended from the support portion 15 by a support plate 16, which is held in place by means of a heavy-duty anchor 17. Viewed along the height direction 6, a long bar insulator 18 is attached below the support plate 16, with its end opposite to the support portion 15 connected to another support plate 19. The conductive rail portion 8, to be described, is then held in place on the support plate 19. The attachment of the conductive rail to the support portion is well known and can be seen in detail, for example, in WO 2019 / 097325A1. For the sake of brevity, a more detailed description will therefore be omitted.

[0030] exist Figure 2The conductive rail portion 8 discussed herein is constructed similarly to the other conductive rail portions 9 and 10, and is symmetrical about a plane of symmetry 20 extending along the height direction 6. Viewed along the height direction 6, the upper side of the conductive rail portion 8 has a transverse arm 21, which connects to an extension arm 22 extending in the opposite direction of the height direction 6. A fishtail plate 23 can be attached to the sides of the extension arms 22 facing each other, allowing the conductive rail portions to be precisely aligned with each other in the height direction 6.

[0031] This alignment can be supported by a positive fit acting in the height direction 6, for example by means of spring 24 and groove 25. For permanent fastening, fishplate 23 is screwed to extension arm 22 by means of screw 26. The alignment support by means of spring 24 and groove 25 is described in DE 202004009420U1 and can be viewed in detail therein.

[0032] On the side of the extendable arm 22 opposite to the transverse arm 21, each extendable arm 22 has a rail 27 on which an assembly vehicle (not shown further) can move. The assembly vehicle pulls the extendable arm 22 open to insert a contact wire 28 carrying electrical energy for the rail vehicle. In the assembled state, the contact wire 28 is then held forward and backward by two clamping arms 29, which extend from the extendable arm 22 toward the contact wire 28 facing each other.

[0033] exist Figure 2 The conductive rail portion 8 shown in the figure is followed by Figure 1 The device 13 for compensating for the length variation 12 of the conductive rail 7 is shown schematically in the diagram. This is referred to below. Figures 3 to 6 Explain in detail.

[0034] The device 13 has a first support portion 30 and a second support portion 31 having the same design as the first support portion 30, both of which are Figures 6 to 8 As shown in [the image]. Figure 3 The second support portion 31 is shown separately, and it will be explained in detail below as an example of the two support portions 30 and 31.

[0035] The second support portion 31 has a support portion base 32, which is defined by a front end face 33 and a rear end face 34 opposite to it along the travel direction 3. Along the height direction 6, the support portion base 32 is defined by a cover side portion 35 and a base side portion 36 opposite to the cover side portion 35. Along the transverse direction 4, the support portion base 32 is defined by a contact side portion 37 and an outer side portion 38 opposite to the contact side portion 37.

[0036] Two guide grooves 39 are formed in the contact side 37 of the support base 32, extending along the travel direction 3. Each guide groove 39 is open toward the rear end face 34 and closed toward the front end face 33. In the closed area, a locking element 40 protrudes from the contact side 37 in the lateral direction 4. In principle, the locking element 40 can be integrally formed with the support base 32. However, in this embodiment, the locking element 40 is designed as a separate slider, which can be inserted into the guide groove 39 of one support 31 and into the guide groove 39 of the other support 30. This will be described in more detail below. The locking element 40 is therefore referred to as a slider below.

[0037] Each guide groove 39 is shaped like a T-shaped recess. This means that two guide walls 41 are formed at the opening of each guide groove 39, the two guide walls 41 facing each other in the height direction 6, and can guide the slider in the guide groove 39 in a press-fit manner along the lateral direction 4 and against the lateral direction. Along the height direction 6, the lower guide wall 41 of each guide groove 39 has a cleaning interruption portion 42. If the slider is pushed through the guide groove 39 and pushes foreign objects in front of it, then these foreign objects can leave the guide groove 39 through the cleaning interruption portion 42. To further improve this cleaning effect, the guide groove 39 may have a cleaning recess 43 in the area of ​​the cleaning interruption portion 42, which extends in the direction opposite to the height direction 6. For clarity, no... Figure 4 All cleaning interruptions 42 are indicated by reference numerals to cleaning recesses 43. The cleaning interruptions 42 ensure that impurities do not shorten the sliding path of the slider in the guide groove 39 of the assembled device 13. In addition to the cleaning interruptions 42, the guide wall 41 may also have a fastening interruption 44 through which fastening tools, such as screws, can be easily inserted into the guide groove 39.

[0038] On the cover side 35 of the support base 32, each support 31 has two mounting surfaces 45 on which the sliding sleeve 46 (hereinafter referred to as...) can be supported and fixed. Figures 5a to 5c (Explanation in Chinese).

[0039] In the region of the rear end face 34, the support base 32 is designed as a connector 47 that can be inserted between the extension arms 22, as in Figure 2 The fishtail plate 23 shown is used to secure the device 13 to one of the conductive rail portions 8, 9, and 10.

[0040] On the base side 36, the support base 32 has a mounting wall 48. A clamp 49 can be screwed onto the mounting wall 48, and the contact wire 28 can be clamped between the clamps 49. The clamp 49 has a... Figure 2 The clamping arm 29 in the middle has the same function. For clarity, Figure 3 Not all the reference numerals for the clamps 49 are given in the figure.

[0041] In the following text, Figure 4 The slider is explained, having a slider base 50 extending along the travel direction 3.

[0042] Viewed along the height direction 6, the upper and lower sides of the slider base 50 are molded with grooves 51 extending along the travel direction 3. Each groove 51 has a groove width 52, which is selected such that one guide wall 41 of each bearing part 30, 31 can be accommodated side by side in the groove 51, thereby minimizing the tolerance of the two guide walls 41 in the lateral direction within the groove.

[0043] Between the grooves 51, two mounting holes 53 penetrate the center of the slider base 50. Each of the two mounting holes 53 may optionally be designed to have internal threads, which are not shown further. Fasteners such as screws can be inserted into these mounting holes 53 to secure the slider in the guide groove 39.

[0044] The following is for reference Figures 5a to 5d Describe the sliding sleeve 46 mentioned above. The function of the sliding sleeve 46 is to... Figure 6 The conductive rod 55 shown is mechanically held on one of the support portions 30, 31, and draws electrical energy from the conductive rod 55 of the adjacent support portions 31, 30, allowing the transfer of electrical energy to occur between the two support portions 30, 31. From a technical point of view, the sliding sleeve 46 has substantially the same construction and differs only in a few points. Figures 5a to 5d The sliding sleeve 46 shown herein is discussed as a reference embodiment. Differences from other sliding sleeves 46 in device 13 will be discussed herein.

[0045] Each sliding sleeve 46 has a sleeve-shaped sleeve body 56, through which a guide hole 57 penetrates, allowing a conductive rod 55 to be inserted. All sliding sleeves 46 share a common feature: the sleeve-shaped sleeve body 56 is held onto a base plate 58. Viewed from below in the height direction 6, the base plate 58 has mounting holes 59 into which fasteners such as screws or rivets can be inserted to secure the sliding sleeve 46 to the substrate. Figure 4 Mounting surface 45 is shown in the figure.

[0046] The sleeve-shaped sleeve body 56 receives the aforementioned conductive rod 55 in a fixed position and functions as a fixed bearing. This can be achieved in various ways, such as by press-fitting the conductive rod 55 in the sleeve body 56, by material sealing of the conductive rod 55 in the sleeve body 56, or by blocking pins passing through the conductive rod 55 and the pin receiving portion 60 in the sleeve body 56.

[0047] Some of the sliding sleeves 46, for example in Figures 5a to 5d The sliding sleeve 46 shown in the figure, when viewed in the transverse direction 4, has a sleeve body 56' with a different sleeve shape. The sleeve bodies 56 and 56' are held together side by side but spaced apart on the substrate 58.

[0048] The additional sleeve-shaped sleeve body 56' functions as a floating bearing, allowing the conductive rod 55 to have freedom of movement in the travel direction 3, but supporting the conductive rod 55 in the height direction 6 and the lateral direction 4. In this way, the additional sleeve-shaped sleeve body 56' guides the conductive rod 55 along the travel direction 3. To support the free movement of the additional sleeve-shaped sleeve body 56' on the conductive rod 55, a bearing element 61 in the form of a sliding or rolling bearing element can be arranged in the guide hole 57 of the additional sleeve-shaped sleeve body 56', and a lubricant such as grease can be added if necessary. To protect the bearing element 61 from external contamination, the guide hole 57 of the additional sleeve-shaped sleeve body 56' can be sealed at the beginning and end in the travel direction 3 with a sealant 62. To retain the bearing element 61 and the sealant 62, a corresponding press-fit stop joint 63 can be formed in the guide hole 57 of the additional sleeve-shaped sleeve body 56'.

[0049] Finally, the electrical contact medium 64 is arranged in the guide holes 57 of the two sleeve-shaped sleeve bodies 56, 56', which increases the electrical contact between the sliding sleeve 54 and the conductive rod 55. The electrical contact medium 64 can be, for example, a spring, which creates a high contact surface between the sliding sleeve 54 and the conductive rod 55 by means of mechanical pressure.

[0050] If the sliding sleeve 54 has two sleeve-shaped sleeve bodies 56, 56', then in the height direction 6, a sliding shoe 65 can be held below another sleeve-shaped sleeve body 56' in which a conductive rod 55 is loosely mounted. The sliding shoe 65 is... Figure 5bAs shown, it has a convex lower side 66 in the height direction 6. Above the convex lower side 66 in the height direction 6, an insertion element 67 is held on a sliding shoe 65. The insertion element 67 can be inserted into an insertion groove 68 on the substrate 58 in the forward direction 3, such that the sliding shoe 65 is held on the substrate 58 in the forward direction 3. The sliding shoe 65 can be made of any material in principle. However, in this embodiment, the sliding shoe 65 is made of an electrically insulating material, which ensures a sufficient insulation distance between the additional sleeve-shaped sleeve body 56' and the corresponding adjacent support portions 30, 31, so that current is conducted only through the conductive rod. This avoids accidental voltage flashover between the additional sleeve-shaped sleeve body 56' and the corresponding adjacent support portions 30, 31, which could cause damage to the sliding surface and impair the function of the device 13.

[0051] To assemble device 13, firstly, insert the slider into the guide grooves 39 of the two support bases 32, as shown in... Figure 6 As shown, the slider is fixed to the front end face 33 of the corresponding support base 32 using screws passing through the mounting hole 53. Then, the slider is inserted into the corresponding guide groove 39 at the rear end face 34 of the corresponding other support base 32, so that the two supports 30, 31 can be guided to move toward each other in the travel direction 3. In the next step, two conductive rods 55 are used. One end of each conductive rod 55 is fixed in the sliding sleeve 54 using only a sleeve-shaped sleeve body 56. Then, the other sleeve-shaped sleeve body 56' of each sliding sleeve 54 with two sleeve-shaped sleeve bodies 56, 56' is pushed to the other end of each conductive rod 55. Then, the remaining free end of the other conductive rod 55 is fixed in the first sleeve-shaped sleeve body 56. Finally, the base plate 58 of the sliding sleeve 54 in this structure is fixed to the cover side 35 of the support base 32 in the supports 30, 31, thereby forming a structure according to Figure 6 The structure of device 13.

[0052] For example, in order to install device 13, according to Figure 1 In rail segment 1, connector 47 is inserted into the corresponding conductive rail portions 8, 9 located before or after device 13 in the direction of travel 3, and is screwed on by an additional fishplate 69 attached from the outside, which enables... Figure 7 and Figure 8As seen in the diagram. However, before screwing, the contact wire 28 is inserted. In the area of ​​the conductive rail sections 8 and 9, the contact wire can be inserted by the component vehicle that moves on the rail 27, as mentioned above. In the area of ​​the device 13, the component vehicle can drive away from or back onto the rail 27 in the direction of travel 3, because the device 13 does not extend beyond the extension arm 22 in the lateral direction 4. The contact wire 28 can then be attached to the device 13 by means of the clamp 49 mentioned above. The fishplate 69 attached from the outside ensures that the contact wire 28 is precisely leveled in the height direction 6, so that the designated device is also suitable for use in high-speed traffic and the pantograph of the rail vehicle does not experience any vibration in the transition between the conductive rail sections 8 and 9 and the device 13, even at speeds above 150 km / h.

[0053] Figure 9 The optional current conduction of device 13 is shown.

[0054] In an alternative arrangement, the angle profiles 70 and 71 are held on the support base 32 of the support portions 30 and 31 and are electrically connected to the ribbon cable 73. The compensation for the length variation 12 described above is achieved using the same means and in the same manner. Only the transmission of electrical energy between the support portions differs.

[0055] Basically, power transmission is only necessary when the segment insulator 14 is present and the power supply to the conductive rail sections 8, 9 to 1 cannot be guaranteed. Otherwise, there is no need to use the conductive rod 55 or the ribbon cable 73 to transmit power.

Claims

1. A device for compensating for length variations of a conductive rail, the conductive rail extending along the travel direction of a rail vehicle and including a front conductive rail portion viewed along the travel direction and a rear conductive rail portion located behind the front conductive rail portion along the travel direction, the device comprising: - A first support portion, connected to the front guide rail portion and having a guide groove side portion, wherein a guide groove extending in the travel direction is formed in the guide groove side portion; - A second support portion, connected to the rear conductive rail portion, is arranged adjacent to the first support portion in a lateral direction perpendicular to the direction of travel, and has a guide groove side portion that abuts against the guide groove side portion of the first support portion, wherein... A guide groove extending along the travel direction is also formed in the guide groove side portion of the second bearing portion. In the travel direction, a rear locking element is adjacent to the rear of the guide groove of the first bearing portion, and a front locking element is adjacent to the front of the guide groove of the second bearing portion. The rear locking element engages in the guide groove of the second bearing portion in the lateral direction, and the front locking element engages in the guide groove of the first bearing portion in the lateral direction.

2. The apparatus according to claim 1, wherein, Viewed along the direction of travel, the rear locking element is arranged at the end of the first bearing portion, and the front locking element is arranged at the end of the second bearing portion.

3. The apparatus according to claim 1 or 2, wherein, Both the front locking element and the rear locking element are designed as sliding guide rail elements, which are held in the guide groove in the lateral direction.

4. The apparatus according to claim 3, wherein, The rear sliding guide element is held immovably in the guide groove of the first bearing portion along the lateral direction, and the front sliding guide element is held immovably in the guide groove of the second bearing portion along the lateral direction.

5. The apparatus according to claim 3, wherein, The sliding guide element has a cross-section with a double-T shaped profile.

6. The apparatus according to claim 1, wherein, The guide groove of the first bearing portion has a press-fit area for press-fitting with the front locking element of the second bearing portion, the guide groove of the second bearing portion has a press-fit area for press-fitting with the rear locking element of the first bearing portion, and each press-fit area has an interruption portion along the travel direction.

7. The apparatus according to claim 6, wherein, The guide groove of each bearing part is recessed in the region of the interrupted part against the height direction, which is perpendicular to the lateral direction and the direction of travel.

8. The apparatus according to claim 6 or 7, wherein, The interrupted portion in the first bearing portion is shorter than the rear locking element engaged in the guide groove of the first bearing portion, and the interrupted portion in the second bearing portion is shorter than the front locking element engaged in the guide groove of the second bearing portion.

9. The apparatus according to claim 1, wherein, The front locking element and the rear locking element are slidably installed in the guide groove.

10. The apparatus according to claim 1, wherein, The first support portion includes two guide grooves stacked vertically along the height direction and two rear locking elements, and the second support portion includes two guide grooves stacked vertically along the height direction and two front locking elements, wherein the height direction is perpendicular to the travel direction and perpendicular to the lateral direction.

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