JPH08132932A - Compound trolley line - Google Patents

Abstract

PURPOSE: To make a tension member hard to crack by providing the specific number of tension members so as to prevent the severance of a compound trolley line even in the case of one tension member being ruptured. CONSTITUTION: In a compound trolley line, two tension members 2A, 2B formed of copper, stainless steel, or the like are disposed in conductive material 1 such as aluminium or copper. The tension members 2A, 2B are formed into rectangular cross section and disposed vertically in the longitudinal state. As a result, even if one tension member is ruptured, the other tension member bears tension applied to the compound trolley line, so that the severance of the compound trolley line is hardly generated. The number of the tension members can be plural without being limited to two. With the tension members 2A, 2B disposed vertically in the longitudinal state, the aspect ratio of each tension member can be made small, so that a crack is hardly generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved composite trolley wire having a tension member arranged inside a conductive material.

[0002]

2. Description of the Related Art The structure of a conventional composite trolley wire is shown in FIG.
This composite trolley wire has a structure in which a single tension member 2 made of steel, stainless steel or the like and having a rectangular cross section is arranged inside a conductive material 1 such as aluminum, aluminum alloy or copper. The tension member 2 is vertically arranged inside the conductive material 1. This composite trolley wire is manufactured by extrusion-molding the conductive material 1 around the tension member 2 by means such as a continuous extrusion method.

[0003]

The conventional composite trolley wire has the following problems because it uses a single tension member having a rectangular cross section. That is, although a tension member having a rectangular cross section is manufactured by rolling a round bar, a crack may occur in the rectangular tension member if the processing rate (rectangular aspect ratio) is large during this manufacturing. .

Normally, it is inspected whether or not the tension member has a crack, and the tension member in which the crack is detected is not used. However, if the crack is minute, the crack may not be detected. Should a tension member with minute cracks be used, the minute cracks will gradually increase due to tension and vibration during use, and the tension member will eventually break. Breaking of the tension member should be avoided as it will lead to disconnection of the composite trolley wire.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to use a tension member that is unlikely to crack, and even if one tension member breaks, another tension member will break the composite trolley wire. It is an object of the present invention to provide a composite trolley wire that can prevent the above and has excellent long-term reliability.

[0006]

To achieve this object, the present invention provides a composite trolley wire in which a tension member is arranged inside a conductive material, wherein the number of the tension members is two or more. It is a feature.

As the tension members, it is desirable to use two tension members each having a rectangular cross section and vertically arrange them. Further, it is preferable that some of the two or more tension members are arranged above the wear limit position, and the other tension members are arranged at positions allowing the wear. Further, it is desirable that the upper surface of the tension member which allows wear is located above the wear limit position.
Also, the tension member above the wear limit position
It is desirable to make the strength larger than the strength of the tension member that allows wear.

[0008]

[Operation] If the number of tension members is set to two or more, even if one tension member is broken, another tension member bears the tension applied to the trolley wire, so that the composite trolley wire may be broken. Can be reduced.

If two tension members having a rectangular cross section are used as the tension members and these are vertically arranged and arranged vertically, the processing rate (aspect ratio) of each tension member can be reduced. Therefore, it is possible to use a tension member that does not easily crack. This is effective in preventing disconnection of the composite trolley wire due to cracking of the tension member.

Further, if some of the two or more tension members are arranged above the wear limit position and the other tension members are arranged at positions where wear is allowed, the composite trolley wire will reach the wear limit. Even if the position is worn, the tension members that do not always wear remain, which is effective in preventing disconnection of the composite trolley wire.

Further, if the upper surface of the tension member which allows wear is located above the wear limit position, even when the composite trolley wire wears to the wear limit position, a part of the worn tension member is inside the conductive material. Since it will remain on the rail, there is no risk of the worn tension member peeling off and hindering current collection or running on the train.

Further, if the strength of the tension member above the wear limit position is set to be higher than the strength of the tension member that allows wear, even when the composite trolley wire is worn to the wear limit position, the strength is high. Since the tension member remains without being worn, the disconnection of the composite trolley wire can be more reliably prevented.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of the composite trolley wire according to the present invention. In this composite trolley wire, two tension members 2A and 2B made of steel, stainless steel or the like are arranged inside a conductive material 1 such as aluminum, aluminum alloy or copper. 2 tension members 2A,
2B has a rectangular cross-sectional shape, and is vertically arranged in a vertically long state.

As described above, if two tension members are used, even if one tension member breaks, the other tension member bears the tension applied to the composite trolley wire. Breakage is less likely to occur. In this way, even if one tension member breaks, in order to allow other tension members to bear the tension applied to the trolley wire, divide the tension member into multiple pieces such as three or four pieces. You can leave it. Therefore, the number of tension members is not limited to two as long as it is plural.

Further, when the two tension members 2A and 2B each having a rectangular cross section are arranged vertically and arranged vertically as in the first embodiment, the aspect ratio of each tension member can be small. Therefore, the processing rate of each tension member can be reduced. For this reason, the tension member is less likely to be cracked, and the tension member without cracks can be easily manufactured. Therefore, there is no risk of the tension member breaking during use of the composite trolley wire, and eventually disconnection of the composite trolley wire can be prevented.

In the first embodiment, one of the two tension members 2A and 2B is arranged above the wear limit position L and the other tension member 2B is allowed to wear. It is located in the position where By doing so, even if the composite trolley wire wears to the wear limit position L, the upper tension member 2 must be worn.
Since A remains without being worn and the remaining tension member 2A bears the tension of the composite trolley wire, disconnection of the composite trolley wire can be prevented.

Further, in the first embodiment, the upper surface 3 of the lower tension member 2B which allows wear is located above the wear limit position L. By doing so, even when the composite trolley wire is worn to the wear limit position L, a part of the worn tension member 2B remains embedded in the conductive material 1, so that the worn tension member 2B peels off. It is possible to prevent the trouble of collecting electricity or running the train.

Further, in the first embodiment, a recess 4 extending in the longitudinal direction is formed between the upper surface 3 of the lower tension member 2B and the wear limit position L. When such a groove 4 is formed, the conductive material 1 bites into the groove 4. Therefore, even when the composite trolley wire is worn to the wear limit position L, the remaining tension member 2B is worn by the conductive material. It is possible to more reliably prevent the deviation from 1. The same effect can be obtained by forming a convex strip instead of the concave strip 4.

Further, in the first embodiment, it is desirable to make the strength of the tension member 2A arranged above the wear limit position L larger than the strength of the tension member 2B which allows wear. For example, the upper tension member 2A is made of stainless steel, and the lower tension member 2B is made of steel.
The strength of A is made larger than 2B. If the strength of the tension member 2A arranged above the wear limit position L is made larger than the strength of the tension member 2B that allows wear, even when the composite trolley wire wears to the wear limit position L, the strength is high. Since the tension member 2A remains, the disconnection of the composite trolley wire can be prevented more reliably.

FIG. 2 shows a second embodiment of the present invention. This composite trolley wire is the same as the first embodiment in that two tension members 2A and 2B having a rectangular cross section are used, but the opposing surfaces 5A of the two tension members 2A and 2B are the same. It differs from the first embodiment in that 5B is formed in an arc shape. In this way, there is an advantage that the lateral displacement of the two tension members 2A and 2B can be effectively prevented when manufacturing the composite trolley wire.

In the composite trolley wire of the second embodiment, fine concavo-convex portions 6 are formed on both side surfaces of the lower tension member 2B. When the fine uneven portion 6 is formed in this way,
It is possible to prevent the lower tension member 2B from coming off the conductive material 1 when the composite trolley wire is worn. In order to prevent the lower tension member 2B from coming off from the conductive material 1, the cross-sectional shape of the lower tension member 2B may be tapered with a wide upper portion and a narrow lower portion. In this case, fine concavo-convex portions may be formed on both side surfaces of the tapered shape.

FIG. 3 shows a third embodiment of the present invention. In this composite trolley wire, the tension member 2A disposed above the wear limit position L has a circular cross-sectional shape, and the tension member 2B that allows wear has a rectangular cross-sectional shape. Since the tension member 2A having a circular cross section has a smaller processing strain as compared with a rectangular member having a rectangular cross section, cracks hardly occur. Therefore, disconnection of the tension member 2A can be reliably prevented. Further, since the tension member 2A having a circular cross section can have a larger cross-sectional area than the rectangular cross section, it is easier to increase the strength than the tension member 2B.

FIG. 4 shows a fourth embodiment of the present invention. This composite trolley wire is different from the third embodiment in that both side surfaces of the lower tension member 2B are tapered surfaces 7 having a wide upper portion and a narrow lower portion. By doing so, it is possible to reliably prevent the lower tension member 2B from coming off the conductive material 1 when the composite trolley wire is worn.

FIG. 5 shows a fifth embodiment of the present invention. This composite trolley wire is characterized in that a stranded steel wire is used as the tension member 2A arranged above the wear limit position L. Others are the same as the first embodiment. With this, the flexibility of the composite trolley wire can be improved.

The composite trolley wire according to the present invention is not limited to the above-mentioned embodiments. For example, a twisted wire is used as the upper tension member, and a concavo-convex portion on both sides is used as the lower tension member. It is also possible to use the one having the above-mentioned shape or the one having both side surfaces tapered.

[0026]

As described above, in the composite trolley wire according to the present invention, the number of tension members is two or more. Therefore, even if one tension member breaks, the other tension members will be trolley wires. Since the tension applied to the trolley wire is borne, disconnection of the composite trolley wire can be prevented.

If two tension members having a rectangular cross section are used as the tension members and these are vertically arranged and arranged vertically, the processing rate (aspect ratio) of each tension member can be reduced. It is possible to use a tension member that is unlikely to crack, and prevent breakage of the composite trolley wire due to cracking of the tension member.

If, of the two or more tension members, some tension members are arranged above the wear limit position and the other tension members are arranged at positions which allow wear, the composite trolley wire will reach the wear limit. Even if the position is worn, the tension members that do not always wear remain, which is effective in preventing disconnection of the composite trolley wire.

Further, if the upper surface of the tension member that allows wear is located above the wear limit position, even when the composite trolley wire wears to the wear limit position, a part of the worn tension member will be inside the conductive material. Since it will remain on the rail, there is no risk of the worn tension member peeling off and hindering current collection or running on the train.

Further, if the strength of the tension member above the wear limit position is set to be higher than the strength of the tension member that allows wear, even when the composite trolley wire is worn to the wear limit position, the strength is high. Since the tension member remains without being worn, the disconnection of the composite trolley wire can be more reliably prevented.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a composite trolley wire according to the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a third embodiment of the present invention.

FIG. 4 is a sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a conventional composite trolley wire.

[Explanation of symbols]

1: conductive material 2A, 2B: tension member 3: upper surface of tension member 2B
4: Recessed strips 5A, 5B: Opposed surfaces of tension members 2A, 2B 6: Uneven portion
7: Tapered surface

Claims (5)

[Claims] 1. A composite trolley wire in which a tension member is arranged inside a conductive material, wherein the number of the tension members is two or more. 2. The composite trolley wire according to claim 1, wherein two tension members having a rectangular cross section are used as the tension members, and these tension members are vertically arranged and are arranged one above the other. 3. The composite trolley wire according to claim 1 or 2, wherein a part of the tension members is arranged above a wear limit position and the other tension members are arranged at a position which allows wear. 4. The composite trolley wire according to claim 3, wherein an upper surface of a tension member that allows wear is located above a wear limit position. 5. The composite trolley wire according to claim 3 or 4, wherein the strength of the tension member above the wear limit position is made larger than the strength of the tension member that allows wear.