Train line suspension device

Abstract

To provide a train cable hanging tool in which any problem is not caused during a work of drawing a train cable when the train cable is exchanged.SOLUTION: A train cable hanging tool (10) is hanged down from a support structure (20), and hangs and supports a train cable. The train cable hanging tool includes an insulator (11) the upper portion of which is locked to the support structure, a connection fitting (12) disposed on the lower portion of the insulator, a vertical plate member (14) that is attachably / detachably connected to the connection fitting and is rotatable about the horizontal axis, and an annular member (17) that has an internal opening through which a train cable can be inserted, is connected to the connection fitting or the vertical plate member, and is rotatable about the horizontal axis. A part of the opening in the annular member can be released.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a suspending tool used for temporarily suspending an electric train line such as a feeder line or a suspension line when the electric train line is newly installed or re-layed, and to a method for re-laying an electric train line using the same. [Background technology]

[0002] Some feeder wires that are laid along railway tracks to supply power to electric cars running on them are made of aluminum to reduce weight. Generally, feeders are connected to contact wires via feeder branch lines every 250 meters, but aluminum feeders are inferior to copper feeder wires in terms of durability because weak points occur in the feeder branch lines where they are connected to copper contact wires due to a phenomenon called galvanic corrosion. Therefore, construction work is sometimes carried out to replace aluminum feeder wires with copper feeder wires. Note that this work is carried out during non-business hours at night when trains are not running so as not to interfere with commercial train operations.

[0003] Generally, as shown in FIG. 8, a feeder wire 24 is secured by a U-shaped bracket 15 to the lower end of an electric wire suspension device 10 having an insulator 11 suspended from an arm 21 provided at the top of a utility pole 20, and is electrically connected to a contact wire which is joined to and supported by the tip of a movable bracket (not shown) attached to the utility pole, by feeder branch wires provided at a specified interval.

[0004] In the conventional method of replacing a feeder line, as shown in Fig. 9, a suspension pulley 23 is suspended from an arm 21 of a utility pole alongside an existing electric train line suspension tool 10 that supports the feeder line, and a rope is first stretched from this suspension pulley 23, and an end of a new feeder line is joined to the end of this rope and wound up, so that a new feeder line is stretched in advance. Then, on the day of the switching work, the old feeder line and the feeder branch line are disconnected and the old feeder line is cut and removed, and then the new feeder line on the suspension pulley is transferred to the suspension tool, and the feeder branch line is connected and various adjustments are made. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-020381 A Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional feeder re-conductor method described above, the old and new feeders are temporarily supported by support structures such as utility poles, but some of the existing support structures may not have sufficient support strength, and in such cases, the support structures must be rebuilt to have the necessary strength. This results in problems such as increased costs for re-conductoring the feeders and a long construction period. Incidentally, a method using a hanging chain having a ring-shaped chain has been proposed as an invention relating to a wire extension method (for example, Patent Document 1).

[0007] However, the invention of the method described in Patent Document 1 was aimed at extending a power transmission line, and is a method for extending a power transmission line between two steel towers over a long distance, and it is difficult to apply it to the replacement of a feeder line. Specifically, as described above, the work of replacing a feeder line needs to be carried out during non-business hours at night when trains are not running, and the support structures for the feeder line are erected every several tens of meters, so the feeder line needs to be extended several hundred meters in one day across many support structures. However, if the method described in Patent Document 1 is applied, such work cannot be completed in a short time.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a method for re-laying a feeder wire, which does not require rebuilding the support structure of the feeder wire, improves work efficiency, and enables the transfer of the old and new feeder wires to be completed in a short period of time. Another object of the present invention is to provide an electric wire suspending tool that does not impede the work of pulling out the electric wire when replacing the electric wire. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides In a train line suspension device that is suspended from a support structure and supports a train line by suspending it, an insulator whose upper portion is engaged with the support structure; A connecting fitting provided on a lower portion of the insulator; A vertical plate member rotatable about a horizontal axis and detachably connected to the connecting fitting; an annular member having an opening inside through which a train line can be inserted, the annular member being rotatable about a horizontal axis connected to the connecting fitting or the vertical plate member; The annular member is configured to be able to release a portion of the opening.

[0010] According to the above-mentioned means, by replacing the existing hanging device with the hanging device of the present invention equipped with a ring-shaped member, the old feeder wire that was held in the U-shaped metal fitting can be placed on the ring-shaped member having an opening on the inside through which the electric train line can be inserted, the old feeder wire is cut, a new wire is connected to one end of it, and the other end is pulled and pulled out, making it possible to easily replace the old and new feeder wires without interfering with other work.

[0011] Here, preferably, the vertical plate member is formed to have an L-shape, and a central corner portion is rotatably connected to the connecting fitting, The annular member is connected to one end of the L-shaped vertical plate member so as to be rotatable about a pin bolt inserted therethrough, A U-shaped metal fitting for holding the train wire is configured to be connectable to the other end of the vertical plate member in a rotatable state about a horizontal axis. With this configuration, the old and new feeder cables can be replaced with new ones while the U-shaped metal fittings are still attached to the L-shaped vertical plate member, and when the old feeder cable is placed on the annular member, the vertical plate member rotates due to its weight and is moved to a position where it does not interfere with the feeder cable, thereby avoiding interference with the pulling-out work.

[0012] Further, preferably, the annular member is an annular wheel formed by sequentially connecting a plurality of rod-shaped members to form an annular shape, a plate-shaped connecting member rotatably connected to one end of the L-shaped vertical plate member; The annular metal wheel is connected to the underside of the connecting member, and the ends of any two of the multiple rod-shaped members are connected by a pin, so that a portion of the opening can be released by pulling out the pin. With this configuration, an existing annular metal wheel can be used as the annular member connected to the hanging device, thereby avoiding increases in costs and enabling the annular member to be easily and reliably connected to the vertical plate member.

[0013] Alternatively, the annular member includes a pair of hanging plates having upper ends rotatably connected to the connecting fitting by a pin bolt, and a pulley roller mounted between lower ends of the pair of hanging plates in a rotatable state about a horizontal axis, The pin bolt, the pair of hanging plates, and the pulley rollers may form an opening into which a train line can be inserted, and a portion of the opening between the upper ends of the pair of hanging plates may be released by pulling out the pin bolt. With this configuration, the old feeder wire that was held in the U-shaped metal fitting is placed onto the pulley roller of the annular member, the old feeder wire is cut, a new feeder wire is connected to one end of the old feeder wire, and the other end is pulled and pulled out, making it easy to replace the old and new feeder wires without interfering with other work.

[0014] Another invention according to the present application includes a step of replacing at least a part of an existing suspending device that suspends and supports an electric wire suspended from a support structure with an electric wire suspending device having the above-mentioned configuration; cutting the feeder wire suspended and supported by the overhead contact line suspending tool and separating the feeder branch line from the feeder wire; a step of removing the feeder wire from the U-shaped metal fitting connected to the electric train line suspending tool and transferring the feeder wire onto the annular member; a step of connecting a new electric wire to one end of the cut old electric wire, pulling the other end of the old electric wire to pull out the old electric wire from the electric wire suspending tool, and stringing a new electric wire; a step of separating the old electric wire from the new electric wire; connecting a feeder branch line between the new electric conductor and a contact wire; removing the vertical plate member and the annular member from the metal fitting of the hanging device, and connecting the new electric wire to the metal fitting while holding the new electric wire in the U-shaped metal fitting; The present invention is designed to have the following features.

[0015] According to the above-described procedure, there is no need to lay new electric wires in advance, as is the case with conventional re-stringing methods, so there is no need to rebuild the support structure for the feeder wire. In addition, work efficiency is improved and the relocation of the old and new feeder wires can be completed in a short time. Effect of the Invention

[0016] According to the overhead contact line suspension tool of the present invention, there is no hindrance to the work of extracting the overhead contact line when replacing the overhead contact line. Also, according to the overhead contact line replacement method of the present invention, there is an effect that it is not necessary to rebuild the support structure of the overhead contact line, and the work efficiency is improved, and the work of transferring the old and new overhead contact lines can be completed in a short time. [Brief description of the drawings]

[0017] [Figure 1]FIG. 1 shows a first embodiment of an electric rail suspending device according to the present invention, in which (A), (B) and (C) are a front view, a side view and a perspective view showing a state in which a feeder wire is held. [Diagram 2] 1A, 1B, and 1C are a front view, a side view, and a perspective view showing a state in which the electric rail suspension device of the first embodiment is not holding a feeder wire. [Diagram 3] 1 shows a second embodiment of an electric rail wire suspending device according to the present invention, in which (A), (B) and (C) are a front view, a side view and a perspective view showing a state in which a feeder wire is held. [Figure 4] 13A, 13B, and 13C are a front view, a side view, and a perspective view showing a state in which the electric rail suspension device of the second embodiment is not holding a feeder wire. [Diagram 5] 4 is a flowchart showing the steps of a method for restringing a feeder wire using the electric rail suspension tool of the first embodiment. [Figure 6] FIG. 6 is a diagram showing the state of the feeder cable extraction work in step S5 of the flowchart in FIG. 5. [Figure 7] FIG. 4 is a front view showing a modified example of the electric rail suspension device of the first embodiment. [Figure 8] FIG. 1 is a perspective view showing a conventional feeder wire suspending device attached to a utility pole. [Figure 9] FIG. 1 is a perspective view showing a state during restringing in a conventional feeder cable restringing method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of an electric train line suspending device according to the present invention will be described with reference to the drawings. A first embodiment of the contact line suspension tool is shown in Fig. 1 and Fig. 2. Fig. 1 shows the contact line suspension tool holding the feeder wire, and Fig. 2 shows the contact line suspension tool with the feeder wire removed. In Fig. 1 and Fig. 2, (A) is a front view of the contact line suspension tool of the first embodiment, (B) is a side view, and (C) is a perspective view. Note that Fig. 1 and Fig. 2 omit illustration of the upper insulator of the double insulator string of the suspension tool shown in Fig. 8 and the fastener 22 that fastens the upper end of the suspension tool to the arm 21.

[0019] As shown in Fig. 1, the electric rail suspension device 10 of the first embodiment includes a ceramic insulator 11 whose upper end is suspended from an arm or the like attached to the upper part of an electric pole that is an electric rail support structure, an inverted U-shaped connecting metal fitting 12 whose upper end is pin-connected to the lower end of the insulator 11, an L-shaped plate 14 connected to the connecting metal fitting 12 by a horizontal pin bolt 13A so as to be rotatable within a vertical plane, a U-shaped metal fitting 15 connected to one end of the L-shaped plate 14 by a pin bolt 13B, a base plate 16 connected to the other end of the L-shaped plate 14 so as to be rotatable by a pin bolt 13C, and an annular metal wheel 17 connected to the lower surface of the base plate 16. The insulator 11 corresponds to the lower insulator of the existing suspension device shown in Fig. 8.

[0020] Furthermore, U-shaped metal fitting 15 is the same as the U-shaped metal fitting provided at the bottom of existing electric rail suspension device 10 shown in FIG. 8. When replacing the old and new feeder wires, the U-shaped metal fitting of the existing electric rail suspension device 10 may continue to be used as is, or if it has become corroded, it may be replaced with a new U-shaped metal fitting. The base plate 16 has a pair of parallel locking pieces 16a, 16a protruding vertically upward from its upper surface, and an end of the L-shaped plate 14 is inserted between the locking pieces 16a, 16a. The base plate 16 is rotatably connected to the locking pieces 16a, 16a by a horizontal pin bolt 13C that is inserted through the locking pieces 16a, 16a and the L-shaped plate 14.

[0021] In addition, the base plate 16 has a pair of boss portions 16b, 16b that protrude downward from both ends of its underside, and the annular wheel 17 is connected to the underside of the base plate 16 by a pair of bolts B1, B2 that are inserted into these boss portions 16b, 16b. The ring-shaped iron wheel 17 is configured such that six short rod-shaped pieces 17a-17f are jointed together to form a hexagonal shape overall, and a smooth circular opening is formed on the inside. Furthermore, 17a and 17f of the six rod-shaped pieces 17a-17f of the ring-shaped iron wheel 17 are connected by a removable pin P, and when this pin P is pulled out, the connected rod-shaped piece 17f is rotated outward as shown by the arrow, opening part of the ring and opening part of the circular opening.

[0022] When replacing the feeder cable, U-shaped metal fitting 15 is removed from the bottom end of electric rail suspension device 10 in Fig. 8, and L-shaped plate 14 is connected to inverted U-shaped connecting metal fitting 12 with pin bolt 13A as shown in Fig. 1. Then, U-shaped metal fitting 15 is rejoined to the other end of L-shaped plate 14 with pin bolt 13B while still holding feeder cable 24. At this time, pin P is pulled out of ring-shaped iron wheel 17 to leave a portion of the ring open, feeder cable 24 is inserted inside, and then ring-shaped iron wheel 17 is closed to prevent pin P from being inserted into the open state. When the feeder cable is transferred to the ring-shaped member in this manner, the weight of the feeder cable causes L-shaped plate 14 to rotate, so that, as shown by the dashed line in Fig. 2(B), even if U-shaped metal fitting 15 is left attached to L-shaped plate 14, it can be moved to a position that does not interfere with feeder cable 24, thereby avoiding interference with the extraction work.

[0023] The work of relocating the feeder cable involves removing the U-shaped metal fitting 15 from the L-shaped plate 14 at the bottom of the electric train line suspension device 10, moving the feeder cable 24 held by the U-shaped metal fitting 15 onto the rod-shaped piece 17d at the bottom of the ring-shaped metal wheel 17 as shown in Fig. 2, and then replacing the feeder cable with a new one. Then, the load of the new cable is temporarily supported by a clamp or the like, and the pin bolt 13A is removed to remove the L-shaped plate 14 and the ring-shaped metal wheel 17. The new cable is held by the U-shaped metal fitting 15 and connected to the inverted U-shaped connecting fitting 12 by the pin bolt 13B. At this time, the pin P of the ring-shaped metal wheel 17 is pulled out to open a part of the ring, and the feeder cable 24 is removed from the inside. This returns the electric train line suspension device 10 to its original state (Fig. 8) in which the feeder cable 24 is suspended.

[0024] A second embodiment of the contact line suspension device 10 is shown in Fig. 3 and Fig. 4. Fig. 3 shows the contact line suspension device in a state where it holds a feeder wire, and Fig. 4 shows the contact line suspension device in a state where the feeder wire has been removed. In Fig. 3 and Fig. 4, (A) is a front view of the contact line suspension device of the second embodiment, (B) is a side view thereof, and (C) is a perspective view.

[0025] As shown in FIG. 3, the trolley line suspension device 10 of the second embodiment comprises: ceramic insulator 11; connecting fitting 12 which is inverted U-shaped and has its upper end pin-connected to the lower end of insulator 11; a pair of left and right U-shaped hanging plates 14A, 14B and a short I-shaped central hanging plate 14C whose upper ends are rotatably connected to connecting fitting 12 by pin bolt 13A; U-shaped fitting 15 which is connected by pin bolt 13B at a position slightly below the upper ends of hanging plates 14A, 14B; and pulley roller 19 which is rotatably supported by pin 18A at the lower ends of hanging plates 14A, 14B, and is configured as a hanging pulley.

[0026] Hanging plates 14A, 14B are arranged so that their upper ends are close to each other, and pin bolt 13B is longer than pin bolt 13A. Pulley roller 19 is formed so that the center portion has a narrowed shape, and is configured so that when feeder cable 24 is placed on pulley roller 19, feeder cable 24 moves to the center of roller 19 by its own weight, as shown in Fig. 4. Central hanging plate 14C is formed with an insertion hole at the top through which pin bolt 13A is inserted, and an insertion hole at the bottom through which pin bolt 13B is inserted. Hanging plates 14A and 14B also have insertion holes formed through which pin bolt 13B is inserted.

[0027] Furthermore, although not particularly limited, a protrusion 14d protruding forward (or backward) is formed on the upper end of one of hanging plates 14A, 14B (14A in the figure), and as shown in Figure 4, central hanging plate 14C, which has become free by removing U-shaped metal fitting 15, can be horizontalized and a pin 18B can be inserted into an insertion hole formed in central hanging plate 14C and protrusion 14d to maintain the horizontal position. This allows central hanging plate 14C to be moved to a position where it does not interfere with feeder wire 24, thereby avoiding hindrance to the pulling-out operation.

[0028] According to the suspension tool of the second embodiment having the above-mentioned configuration, central hanging plate 14C does not impede the passage of the bundled portion of the feeder branch wires when pulling out feeder cable 24, and the wide spacing between hanging plates 14A, 14B makes it easy to pull out feeder cable 24. Also, when placing feeder cable 24 on pulley rollers 19, it is no longer necessary to remove pin bolt 13A and detach central hanging plate 14C, which has the advantage of improving work efficiency. In the second embodiment, an I-shaped central hanging plate 14C is used to support the U-shaped metal fitting 15 during temporary installation, but an L-shaped plate may also be used as in the first embodiment.

[0029] Next, the procedure of the method for restringing a feeder wire according to the present invention using the electric rail suspension device 10 of the first embodiment will be described with reference to Fig. 5 to Fig. 6. Fig. 5 is a flowchart showing the procedure for restringing a feeder wire, and Fig. 6 is an explanatory diagram showing the state of the work of extracting the feeder wire.

[0030] In the work of replacing the feeder wire according to the flowchart in Fig. 5, first, U-shaped metal fittings 15 and the feeder wire 24 are removed from the existing electric wire suspension device 10 of the electric pole in the area to be replaced, and the central corner of the L-shaped plate 14, which has a ring-shaped metal wheel 17 already connected to its end, is attached to the inverted U-shaped connecting metal fitting 12 at the bottom of the electric wire suspension device 10 with pin bolt 13A, and the U-shaped metal fitting 15 is attached to the other end of the L-shaped plate 14 with pin bolt 13B while still holding the feeder wire 24, resulting in the state shown in Fig. 1(A) (Step S1). The work of Step S1 should be performed for the suspension devices of all electric poles in the area to be replaced by the day before the day of the work to replace the feeder wire.

[0031] Next, on the day of the work to replace the feeder cable, the worker cuts the old feeder cable 24 in the replacement range to an appropriate length (e.g., 300 m) and disconnects the feeder branch line connected to the feeder cable in the cut range (step S2). Next, the worker removes the U-shaped metal fittings 15 from the L-shaped plates 14 at the bottom of all the electric rail suspension devices 10, and places the feeder cable 24 on the ring metal car 17 in an unsupported state, resulting in the state shown in Fig. 2(B) (step S3). 6, one end of the old feeder 24 cut in step S2 is connected to an end of a new feeder wire wound around a drum 31A mounted on a road-rail car 30A by a cable grip 25, and the other end of the old feeder wire is fastened to the outer periphery of an empty drum 31B mounted on a road-rail car 30B (step S4). Note that the operations of steps S3 and S4 may be performed in the reverse order.

[0032] Thereafter, a new electric wire is fed out from drum 31A of road-rail vehicle 30A while the old electric wire is wound onto empty drum 31B. The old electric wire is pulled out and removed from the annular metal car 17 at the bottom of the electric line suspension device 10 while a new electric wire is tensioned (step S5), and the old and new electric wires are disconnected (step S6). Next, the worker performs various adjustments such as removing slack or twisting in the new electric wire, and connects the feeder branch line between the new electric wire and the contact wire (Step S7). Then, the L-shaped plates 14 are removed from the bottom of all the electric wire suspenders 10, and the U-shaped metal fittings 15 are removed from the L-shaped plates 14, the weight of the new electric wire on the ring-shaped metal fittings 17 is temporarily supported by a sealer or the like, the ring-shaped metal fittings 17 are removed, the U-shaped metal fittings 15 holding the new electric wire are attached to the inverted U-shaped connecting metal fittings 12 at the bottom of the electric wire suspenders 10, and the end of the feeder wire is connected to the end of the adjacent feeder wire, completing the series of restringing operations (Step S8).

[0033] According to the feeder re-stretching method of the above embodiment, by repeating the above-mentioned procedure, it is possible to complete the re-stretching of feeder wires over an area of ​​several kilometers in one day (during non-business hours at night). In addition, unlike the conventional feeder re-stretching method, two new and old feeder wires are not supported by one utility pole, even if only temporarily, so there is an advantage that there is no need to rebuild the support structure for the feeder wires, which may lack strength.

[0034] Furthermore, according to the procedure of the above embodiment, the state at the end of the work in step S1 does not impede train operation in any way, so that trains can be operated during the day while the replacement of all of the electric wire suspension devices 10 in the area to be restringed can be carried out sequentially over several days during non-business hours at night. This has the advantage that the work of replacing the old feeder wire (aluminum feeder wire) with a new feeder wire (copper feeder wire) can be carried out without interrupting the operation of commercial trains.

[0035] (Modification) FIG. 7 shows a modified example of the overhead contact line suspension device. In this modified catenary suspension device 10, the length of base plate 16 in the catenary suspension device of the first embodiment shown in Figures 1 and 2 is increased, and a semi-annular catenary 17' made up of three rod-shaped pieces 17c to 17e is used instead of the annular catenary 17 made up of six rod-shaped pieces 17a to 17f.

[0036] In the modified example of FIG. 7, the connection between the base plate 16 and the rod-shaped piece 17e can be released by pulling out the pin P, and part of the loop can be opened. This type of overhead contact line suspension device has the advantage that, compared to the overhead contact line suspension device of the first embodiment, it is possible to increase the inner opening width and opening area without increasing the vertical length of the annular metal wheel, and it is possible to easily perform the work of pulling out the feeder wire while ensuring a distance from existing installed objects during temporary installation. The procedure for replacing the feeder wire may be the same as that of the above embodiment described using Figure 5.

[0037] Although the invention made by the present inventor has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the explanation of the procedure for replacing the feeder wire using Fig. 5, the case where the feeder wire is replaced using the electric wire suspension tool of the first embodiment has been taken as an example, but it is also possible to replace the electric wire using the electric wire suspension tool of the second embodiment in a similar procedure to the above. In addition, the electric wire suspension tool according to the present invention can also be used when replacing electric wires other than feeders or when installing new electric wires. [Explanation of symbols]

[0038] 10. Train line suspension device 11 Insulator 12 Connecting hardware 13A~13C Pin bolt 14 L-shaped plate 14A, 14B Hanging plate 14C Center hanging plate 15 U-shaped bracket 16 Base plate 17 Circular Gold Wheel 18A,18B pin 19 Pulley roller 20 Electric pole 21 Arms 22 Fasteners 23 Suspension pulley 24 Feeder Line 25 Cable Grip 30A,30B land rail vehicle 31A, 31B Drum

Claims

1. A train line suspension tool that is suspended from a support structure and supports a train line by suspending the train line, an insulator whose upper portion is engaged with the support structure; A connecting fitting provided on a lower portion of the insulator; A vertical plate member rotatable about a horizontal axis and detachably connected to the connecting fitting; an annular member having an opening inside through which a train line can be inserted, the annular member being rotatable about a horizontal axis connected to the connecting fitting or the vertical plate member; Equipped with The annular member is configured to be able to release a portion of the opening, The vertical plate member is formed in an L-shape, and a central corner portion is rotatably connected to the connecting fitting, The annular member is connected to one end of the L-shaped vertical plate member so as to be rotatable about a pin bolt inserted therethrough, a U-shaped metal fitting for holding the electric train line is configured to be connectable to the other end of the vertical plate member in a rotatable state about a horizontal axis.

2. The annular member is an annular metal wheel formed by sequentially connecting a plurality of rod-shaped members to form an annular shape, a plate-shaped connecting member rotatably connected to one end of the L-shaped vertical plate member; 2. The trolley wire suspension device according to claim 1, wherein the annular metal wheel is connected to an underside of the connecting member, ends of any two of the plurality of rod-shaped members are connected by a pin, and a portion of the opening can be released by pulling out the pin.

3. A train line suspension device that is suspended from a support structure and supports a train line by suspending the train line, an insulator whose upper portion is engaged with the support structure; A connecting fitting provided on a lower portion of the insulator; A vertical plate member rotatable about a horizontal axis and detachably connected to the connecting fitting; an annular member having an opening inside through which a train line can be inserted, the annular member being rotatable about a horizontal axis connected to the connecting fitting or the vertical plate member; Equipped with The annular member is configured to be able to release a portion of the opening, the annular member includes a pair of hanging plates having upper ends rotatably connected to the connecting fittings by pin bolts, and a pulley roller mounted between lower ends of the pair of hanging plates in a rotatable state about a horizontal axis, the pin bolt, the pair of hanging plates, and the pulley rollers define an opening into which the train line can be inserted, and a portion of the opening between upper ends of the pair of hanging plates is released by pulling out the pin bolt.

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