Movable bracket device

Abstract

To provide a movable bracket device that can prevent a flow without causing any ununiform tension fluctuation of an overhead power line.SOLUTION: A movable bracket device includes: a movable bracket body of which proximal end side is fitted to a support post so as to be rotatable about a longitudinal axis of the support post and which includes a trolley wire support part on a distal end side; and a rotational rigidity adding device for adding biasing force about the axis.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a movable bracket device for supporting an electric train line.

Background Art

[0002] Generally, an overhead line constituting an electric train line is composed of a trolley wire for supplying electricity to a train and a suspension wire for suspending the trolley wire. These overhead lines are installed on a support installed at a predetermined interval along the track via a movable bracket. Further, a tension adjusting device is provided at both ends of the overhead line, and a predetermined tension is applied to the overhead line.

[0003] The movable bracket extends upward from the upper part of a support installed beside the track toward above the track and is rotatably attached with an axis parallel to the longitudinal direction of the support as a rotation axis. According to such a movable bracket, even when the overhead line expands or contracts due to temperature change or the like, the rotation of the movable bracket can allow the horizontal displacement of the overhead line, enabling smooth adjustment of the tension of the overhead line (hereinafter referred to as a span) located between adjacent supports.

[0004] The movable bracket includes an I-type movable bracket that pulls the trolley wire toward the support and an O-type movable bracket that pulls the trolley wire in the direction opposite to the support. In a straight section, the I-type movable brackets and the O-type movable brackets are alternately installed along the track. By alternately installing the I-type movable brackets and the O-type movable brackets in this way, the trolley wire can be installed in a zigzag pattern with respect to the track, and the wear of the sliding plate of the pantograph that contacts the trolley wire can be made uniform.

[0005] Since tension is applied to the overhead line from both ends by the tension adjustment device, in a curved section, a force acting toward the inside of the curve acts on the overhead line. Therefore, in order to keep the overhead line in a predetermined position, it is necessary to pull the trolley wire outward of the curve by the movable bracket. Accordingly, when the support is installed outside the curve, I-shaped movable brackets that pull the trolley wire in the direction of the support may be continuously installed. Further, when the curved section is in a double-track section, the supports are installed on both sides of the curve, and O-shaped movable brackets that pull the trolley wire in the direction opposite to the support may be continuously attached to the supports installed inside the curve.

[0006] Here, FIG. 4 is a graph showing the state when a temperature change of -20°C is applied to an overhead line including a 50 m uniform span within a 1350 m retention section. FIG. 4(a) is a graph showing the amount of tension fluctuation in each span, and FIG. 4(b) is a graph showing the stroke difference between both ends of the overhead line. Note that the tram line conditions within the retention section in this calculation example are that half is a curved section with a radius of R10000 m and the other half is a curved section with a radius of R1500 m. For the curved section with a radius of R1500 m, the overhead line is continuously supported by conventional O-shaped movable brackets.

[0007] As shown in FIG. 4(b), when the overhead line must be continuously supported by O-shaped movable brackets, a large difference may occur in the horizontal displacement of the overhead line due to temperature change, and a large difference may occur in the stroke of the tension adjustment device that holds both ends of the overhead line. Note that in this specification, such a phenomenon in which the horizontal displacement of the overhead line is biased in one direction is referred to as the flow of the overhead line. When the amount of flow of the overhead line increases, it is necessary to increase the stroke allowed by the tension adjustment device, which causes inconveniences such as an increase in the size of the device.

[0008] Conventionally, as countermeasures against such flow of the overhead line, a method of suppressing the flow of the overhead line as shown in Patent Document 1 and a method of adjusting the flow of the overhead line as shown in Patent Document 2 are known.

Prior Art Documents

Patent Document

[0009]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0010] The invention described in Patent Document 1 is an invention that can suppress the flow of the overhead line by using a tension adjustment device composed of a combination of a spring and a link mechanism. However, it is assumed that such an invention cannot obtain sufficient effects under conditions such as a curve section.

[0011] Also, the invention described in Patent Document 2 is an invention related to the adjustment after the flow of the overhead line occurs and does not suppress the flow of the overhead line.

[0012] Also, as a technique for suppressing the flow of the overhead line, conventionally, a method using a flow stopper that fixes the overhead line and the support column at a substantially central portion in the length direction of the overhead line is known.

[0013] Here, FIG. 5 is a graph showing the state when a temperature change of -20°C is applied to an overhead line continuously supported by a conventional O-shaped movable bracket and an overhead line with a conventional flow stopper attached to a substantially central portion in the length direction. FIG. 5(a) is a graph showing the amount of tension fluctuation in each span, and FIG. 5(b) is a graph showing the stroke difference between both ends of the overhead line.

[0014] When using a conventional flow stop device, as shown in Fig. 5(b), the stroke difference at both ends of the overhead line due to temperature changes can be eliminated. However, the conventional flow stop device cannot rotate about the attachment portion to the support column like a movable bracket, and cannot allow the horizontal displacement of the overhead line. Therefore, when using the conventional flow stop device, as shown in Fig. 5(a), the tension may become discontinuous in the spans before and after the support column where the conventional flow stop device is installed (span numbers 13 and 14 in Fig. 5(a)). In this way, when the tension applied to the overhead line becomes discontinuous, there is a risk of causing a decrease in current collection performance.

[0015] Therefore, the present invention has been made in view of the above matters, and an object of the present invention is to provide a movable bracket device that can prevent flow without accompanying non-uniformity of tension fluctuations in the overhead line even when the overhead line must be continuously supported by an O-shaped movable bracket in a curve section or the like.

Means for Solving the Problems

[0016] This invention has been made to achieve the above object, and is characterized by the following.

[0017] The movable bracket device according to the present invention is a movable bracket device including a movable bracket main body having a trolley wire support portion on the tip side and rotatably attached around the axis in the longitudinal direction of the support column at the base end side, and is characterized by including a rotational rigidity addition device that applies a biasing force around the axis.

[0018] In the movable bracket device according to the present invention, it is preferable that the rotational rigidity addition device includes a support portion extending in the radial direction of the support column and an elastic member disposed between the support portion and the movable bracket main body.

[0019] In the movable bracket device according to the present invention, it is preferable that the elastic members are respectively disposed in the positive and negative directions around the axis.

[0020] In the movable bracket device according to the present invention, the movable bracket main body includes a horizontal main member that horizontally extends upward toward the overhead line via a horizontal insulator, and an inclined main member that extends obliquely upward from the support column via an inclined insulator below the horizontal main member toward the tip side of the horizontal main member and is coupled to the horizontal main member at the tip. The rotational rigidity adding device is preferably attached to the base end side of each of the horizontal main member and the inclined main member.

[0021] The above summary of the invention does not list all the features necessary for the present invention, and sub - combinations of these feature groups can also be inventions.

Effects of the Invention

[0022] According to the present invention, even when the overhead line has to be continuously supported by the O - type movable brackets in a curve section or the like, it is possible to prevent the flow of the overhead line without uneven tension fluctuations.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0024] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of the features described in the embodiments are essential for the solution means of the invention.

[0025] Figure 1 is a reference front view for explaining the configuration of the movable bracket body of the present invention, and Figure 2 is a plan view showing the movable bracket device of the present invention.

[0026] As shown in FIGS. 1 and 2, the movable bracket device 1 according to the present embodiment is attached to the upper part of a support column S installed beside the line, and includes a movable bracket body 10 that supports a suspension wire M and a trolley wire T, and a rotational rigidity adding device 20 that adds an urging force to the movable bracket body 10.

[0027] The movable bracket body 10 is configured such that the base end is on the support column S side and the tip extends upward above the line. Further, the movable bracket body 10 is rotatably attached about a rotation axis C extending parallel to the longitudinal direction of the support column S at the attachment portion with the support column S. The movable bracket body 10 includes, as an example, a horizontal main member 11 made of a steel pipe, an inclined main member 12, a vibration damping pipe 13, and a curved hanger 14.

[0028] The horizontal main member 11 extends horizontally upward from the support column S toward the upper side of the line. The horizontal main member 11 is attached to the support column S so as to be rotatable about the rotation axis C via a horizontal insulator 11a at the proximal end side. The horizontal main member 11 is provided with a suspension wire support portion 11b at the distal end side, and the suspension wire support portion 11b grips the suspension wire M.

[0029] The diagonal main member 12 extends obliquely upward from the support column S toward the upper side of the line below the horizontal main member 11. The diagonal main member 12 is attached to the support column S so as to be rotatable about the rotation axis C via a diagonal insulator 12a at the proximal end side. The distal end portion of the diagonal main member 12 is connected to the horizontal main member 11 and supports the horizontal main member 11 from below.

[0030] The vibration damping pipe 13 is attached so as to extend horizontally from the middle portion of the diagonal main member 12 toward the upper side of the line. A curve fitting 14 is attached to the distal end side of the vibration damping pipe 13. Further, as shown in FIG. 1, the distal end side of the vibration damping pipe 13 is bent in a substantially U shape and connected to the distal end portion of the horizontal main member 11.

[0031] The curve fitting 14 extends in an arc shape obliquely downward from the distal end side of the vibration damping pipe 13 toward the support column S and is rotatably attached to the vibration damping pipe 13. Further, the curve fitting 14 is provided with a trolley wire support portion 14a at the distal end portion, and the trolley wire support portion 14a grips the trolley wire T.

[0032] The movable bracket body 10 configured as described above becomes an O-shaped movable bracket that pulls the trolley wire T in the direction opposite to the support column S.

[0033] As shown in FIG. 2, the rotational rigidity adding device 20 includes a support portion 21 extending radially from the support column S and an elastic member 22 disposed between the support portion 21 and the movable bracket body 10.

[0034] The support portion 21 is attached to the support column S and is arranged at a height corresponding to the proximal end side of each of the horizontal main member 11 and the diagonal main member 12. Further, the support portion 21 is formed to extend on both the front and rear sides in the direction in which the overhead wire extends. Note that, as shown in FIG. 2, the support portion 21 is shown as an example in which it obliquely extends in the radial direction of the support column S and in a direction away from the overhead wire, but the shape of the support portion 21 is not limited to this. For example, it may have a structure that extends in the tangential direction of the support column S and parallel to the direction in which the overhead wire extends, and may be appropriately determined according to obstacles or the like existing around the support column S.

[0035] The elastic member 22 is disposed between the support portion 21 and the proximal end portions of each of the horizontal main member 11 and the diagonal main member 12, and applies a biasing force in the forward and reverse directions to the operation around the rotation axis C of the movable bracket body 10.

[0036] The elastic member 22 is, as an example, constituted by a compression coil spring. Further, the elastic member 22 composed of a compression coil spring is preferably arranged such that the central axis is arcuate corresponding to the rotation direction of the movable bracket body 10, as shown in FIG. 2. Note that the elastic member 22 composed of a compression coil spring is not limited to the case where the central axis is arranged to be arcuate in this way. For example, it may be arranged such that the central axis is linear, and may be appropriately determined according to the shape of the support portion 21.

[0037] Thus, the movable bracket device 1 according to the present embodiment can generate a reaction force against the rotation of the movable bracket body 10 by the elastic member 22. Therefore, even when a current flows in the overhead wire, the movement of the movable bracket body 10 that rotates in conjunction with the flow of the overhead wire can be suppressed, and a resistance force against the flow of the overhead wire can be generated.

[0038] Next, the effects of the movable bracket device 1 according to the present embodiment will be described.

[0039] FIG. 3 is a graph showing the state when a temperature change of -20°C is applied to the overhead line continuously supported by the movable bracket device 1 of the present invention. FIG. 3(a) is a graph showing the amount of tension fluctuation in each span, and FIG. 3(b) is a graph showing the stroke difference between both ends of the overhead line.

[0040] According to the movable bracket device 1 according to the present embodiment, as shown in FIG. 3(b), the strokes of both ends of the overhead line can be made approximately the same. Further, as shown in FIG. 3(a), the difference in the amount of tension fluctuation between adjacent spans over the entire length of the overhead line becomes small, and no location where the tension becomes discontinuous was confirmed.

[0041] Thus, according to the movable bracket device 1 according to the present embodiment, even when the overhead line must be continuously supported by the movable bracket main body 10 which is an O-shaped movable bracket in a curve section or the like, the rotation of the movable bracket main body 10 is suppressed by the rotation rigidity addition device 20, and by generating a resistance force against the flow of the overhead line, the flow of the overhead line can be prevented without accompanying non-uniformity of the tension of the overhead line.

[0042] In the present embodiment, the elastic member 22 has been described as being composed of a compression coil spring. However, the configuration of the elastic member 22 is not limited to this, and any structure that can apply a biasing force in the positive and negative directions with respect to the operation around the rotation axis C of the movable bracket main body 10 may be used. For example, it may be configured by a torsion spring or the like. It is clear from the description of the claims that such a modified or improved form may also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0043] 1 Movable bracket device, 10 Movable bracket main body, 11 Horizontal main member, 11a Horizontal insulator, 11b Overhead line support part, 12 Diagonal main member, 12a Diagonal insulator, 13 Vibration damping pipe, 14 Curve fitting, 14a trolley wire support part, 20 Rotation rigidity addition device, 21 Support part, 22 Elastic member, C Rotation axis, M Overhead line, S Support column, T Trolley wire.

Claims

1. A movable bracket device comprising a movable bracket body having a trolley wire support portion on the distal end side and rotatably attached around the axis in the longitudinal direction of the support column at the proximal end side, The movable bracket device is characterized by comprising a rotational rigidity adding device for applying a biasing force around the axis.

2. In the movable bracket device according to Claim 1, The rotational rigidity adding device comprises a support portion extending in the radial direction of the support column and an elastic member disposed between the support portion and the movable bracket body. The movable bracket device is characterized by this.

3. In the movable bracket device according to Claim 2, The elastic member is disposed in the forward and reverse directions around the axis respectively. The movable bracket device is characterized by this.

4. In the movable bracket device according to Claim 1, The movable bracket body includes a horizontal main member extending horizontally upward above the line via a horizontal insulator, and an inclined main member extending obliquely upward from the support column via an inclined insulator below the horizontal main member toward the distal end side of the horizontal main member and coupled to the horizontal main member at the tip. The rotational rigidity adding device is attached to the proximal end side of each of the horizontal main member and the inclined main member. The movable bracket device is characterized by this.

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