JP2012060755A - Connection structure of multicore metal cable, connection method of multicore metal cable, multicore metal cable for railway signal, and cable branch adapter for railway signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure of multicore metal cables which uses multicore metal cables to which connector fitting portions are attached in advance in a factory or the like and has excellent workability to allow reduction in work time and prevention of wiring error or the like.SOLUTION: Multicore cables 5a, 5b are multicore metal cables, in which a plurality of coated cables 17 are covered by a sheath 7. A connector fitting portion is connected to the end portion of each of the pair of multicore cables 5a, 5b. Cable exposed portions 19 are formed from the end portions of the multicore cables 5a, 5b toward the rear direction. Sheath holding portions 9 holding the sheaths 7 are provided in areas behind the cable exposed portions 19, and the sheath holding portions 9 are coupled by coupling members 11. The cable exposed portions 19 and the connector fitting portions are integrally coated by coating resin 13. By forming the cable exposed portions 19, a plurality of the coated cables 17 can be twisted in a circumferential direction at once, and the fitting portion positions of the connector fitting portions can be aligned.

Description

  The present invention relates to a method of connecting a multi-core metal cable used for a railway signal cable.

  The connection of conventional signal cables for railway needs to ensure waterproofness. For this reason, a so-called resin construction method has been adopted in which the connecting portion of the cable is hardened with a curable resin.

  The resin construction method is to secure the waterproof structure and the tensile strength of the connection part by caulking the insulation wires to be connected at the site one by one, covering the whole part where the sheath is removed with a sleeve, and pressing and curing the epoxy resin Is.

  As a connection method using such a so-called resin method, for example, a sleeve having a hole formed in a wall portion is used, a conductive wire is inserted from both sides of the sleeve, the sleeve is deformed and pressure-bonded, and then resin is inserted from the hole. (Patent Document 1).

JP 2009-104875 A

  However, the conventional method as disclosed in Patent Document 1 is a work that requires skill, and particularly for railway signal lines, because it is a work in a limited night work zone. There is a problem that it is difficult to ensure the curing time. Similarly, there is the same work in branch connection, and the core wire connected as a trunk line, the core wire connected to the branch, etc. must be identified in the field, which causes erroneous connection. There's a problem.

  In addition, when a multi-core metal cable is used, it is difficult to twist the entire cable, and thus it is difficult to perform bonding using a connector fitting portion in which a fitting position is determined. For this reason, in the connection part, it is necessary to connect one core at a time by the above-mentioned resin construction method.

  The present invention has been made in view of such problems, and uses a multi-core metal cable in which a connector fitting portion (plug or receptacle) is attached in advance at a factory or the like, and is excellent in workability, reducing work time, and wiring. An object of the present invention is to provide a multi-core metal cable connection structure that can prevent mistakes and the like.

  In order to achieve the above-described object, a first invention is a connection structure for a multi-core metal cable formed in a closure, and a plurality of insulation-coated cables and a sheath that collectively covers the plurality of insulation-coated cables. In the vicinity of each end portion of the pair of multi-core metal cables, a cable exposed portion that exposes the plurality of insulation-coated cables is formed, and a connector is fitted to each end of the plurality of insulation-coated cables. And a pair of the multi-core metal cables are connected to each other by the connector fitting portion, and the sheath holding members that are provided behind the cable exposed portions and hold the sheath are connected to each other. And at least the cable exposed portion and the connector fitting portion are covered with a coating resin. It is a connection structure of Le.

  When the cross section of the bundle of the plurality of insulation-coated cables is circular, and the center diameter of a virtual circle formed by connecting the respective centers of the insulation-coated cables located on the outermost periphery is D, the cable exposure portion The length is desirably 2D to 4D.

  The multi-core metal cable has a corrugated metal tube inside a sheath, and the plurality of insulation-coated cables are inserted into the corrugated metal tube, and each of the cable exposed portion and the portion where the sheath holding portion is provided. A corrugated tube exposed portion from which the corrugated tube is exposed is formed therebetween, and each corrugated tube exposed portion is provided with a corrugated tube holding portion for holding the corrugated tube, and each corrugated tube holding portion is They may be connected to each other by a conductor.

  The vicinity of the boundary between the corrugated tube exposed portion and the cable exposed portion may be fixed with an epoxy resin. The coating resin may be a urethane resin.

  According to the first invention, since the multi-core metal cables are connected to each other via the connector fitting portion, the connection work is easy and connection errors can be prevented. Also, normally, multi-core metal cables covered with a sheath are extremely strong in the torsional direction, and the connector fitting portions cannot be aligned with each other, but the exposed portions of the insulation-coated cables are formed. The entire insulation-coated cable can be collectively twisted in the circumferential direction at the cable exposed portion. For this reason, the fitting position alignment of the connector fitting parts is possible.

  In particular, if the length L of the cable exposed portion is 2D to 4D with respect to the core diameter D of the virtual circle formed of the insulation-coated cable, when the cable is twisted, the insulation-coated cable and the connector fitting portion Since an excessive force is not applied to the connecting portion and it is not necessary to form a cable exposed portion that is longer than necessary, the size of the connecting portion can be reduced.

  Further, by connecting the sheath holding portions to each other, it is possible to prevent an axial stress from being applied to the connecting portion, so that it is not necessary to use a curable epoxy resin or the like for the connecting portion as in the prior art. Therefore, for example, in order to ensure the waterproofness of the connection part, by covering the connection part with a urethane-based resin, it is excellent in workability and can secure the waterproofness, and when checking and repairing the connection part, It is also possible to easily remove the coating resin that covers the connecting portion.

  In addition, a multi-core metal cable using a corrugated metal tube is excellent in strength and shielding properties, but is more difficult to twist in the circumferential direction. Also in this case, by forming the cable exposed portion, the entire insulation-coated cable can be twisted in the circumferential direction collectively at the cable exposed portion, and the fitting position of the connector fitting portion can be adjusted. In this case, the shielding property can also be maintained by connecting the corrugated metal tubes to be connected with a conductor.

  In addition, when using a corrugated metal tube, by fixing the vicinity of the interface between the cable exposed portion and the exposed portion of the corrugated metal tube with an epoxy resin, there is no relative movement between the corrugated metal tube and the insulation-coated cable, An excessive force is not applied to the connecting portion.

  A second invention is a method for connecting multi-core metal cables, and is provided at a plurality of insulation-coated cables, a sheath for collectively covering the plurality of insulation-coated cables, and tips of the plurality of insulation-coated cables. In the vicinity of each end portion of the pair of multi-core metal cables having a connector fitting portion, a cable exposed portion where the plurality of insulation-coated cables are exposed is formed, and behind each of the cable exposed portions, A sheath holding member for holding the sheath is provided, the connector fitting portions of the pair of multi-core metal cables are opposed to each other, the cable exposed portion is twisted in the circumferential direction of the multi-core metal cable, and the connector fitting is performed. The connector fitting parts are connected to each other by matching the fitting positions of the parts, and at least the cable is covered with a coating resin that is a urethane resin. While leaving part and covering the connector fitting portion, a multicore connection method for a metal cable, which comprises coupling the sheath holding members to each other.

  According to the second invention, the fitting position of the connector fitting portion can be easily adjusted even for a multi-core metal cable that is difficult to twist in the circumferential direction. Therefore, it is excellent in workability.

  The third invention comprises a plurality of insulation-coated cables, a sheath for collectively covering the plurality of insulation-coated cables, and a connector fitting portion provided at the tip of the plurality of insulation-coated cables, A cable exposed portion where the plurality of insulation-coated cables are exposed is formed behind the connector fitting portion, a cross-section of the bundle of the plurality of insulation-coated cables is circular, and each of the insulation-coated cables positioned on the outermost periphery When the center diameter of a virtual circle formed by connecting the centers is D, the length of the cable exposed portion is 2D to 4D, and the plurality of insulation-coated cables are connected to the cable exposed portion. A multi-core metal cable for railway signals, which can be twisted together in the circumferential direction.

  According to the third invention, it is possible to obtain a multi-core metal cable excellent in connection workability on site for use as a railway signal.

  A fourth invention is a cable branch adapter for railway signals used for a branch connection portion of a multi-core metal cable, and is connected to the first connector fitting portion and the first connector fitting portion. The insulation-coated cable and the plurality of insulation-coated cables are branched into a plurality of portions, and a second connector fitting portion is connected to each end of each branched insulation-coated cable, and the first connector fitting The insulation-covered cable between the joint portion and the second connector fitting portion is exposed, the cross-section of each of the branched insulation-covered cables is circular, and the outermost insulation cover For a railway signal, the length of exposure of the insulation-coated cable is 4D to 8D, where D is the center diameter of a virtual circle formed by connecting the centers of the cables. Cable branch It is an adapter.

  According to the fourth invention, the branch of the railway signal cable can be easily formed.

  According to the present invention, a multi-core metal cable having a connector fitting portion attached in advance at a factory or the like is used, and the connection structure of the multi-core metal cable is excellent in workability, can reduce work time, and prevent wiring errors. Can be provided.

It is a figure which shows the metal cable connection structure 1, (a) is a closure perspective view, (b) is an axial sectional view. It is sectional drawing of the metal cable connection structure 1, (a) is the sectional view on the AA line of FIG.1 (b), (b) is the sectional view on the BB line of FIG.1 (b). The figure which shows the construction process of the metal cable connection structure 1. FIG. The figure which shows the construction process of the metal cable connection structure 1. FIG. The figure which shows the state which a covered cable twists. The figure which shows the state which a covered cable twists. The figure which shows the construction process of the metal cable connection structure 1. FIG. The figure which shows the construction process of the metal cable connection structure 1. FIG. FIG. 3 is an axial sectional view showing a metal cable connection structure 30. It is sectional drawing of the metal cable connection structure 30, (a) is the FF sectional view taken on the line of FIG. 8, (b) is the GG sectional view of FIG. 8, (c) is the HH line of FIG. Sectional drawing. (A) is a figure which shows the metal cable branch adapter 40, (b) is a figure which shows the metal cable connection structure 50. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1A and 1B are views showing a metal cable connection structure 1, FIG. 1A is a front view (a perspective view of a closure 3), and FIG. 1B is a cross-sectional view with respect to an axial direction. 2A is a cross-sectional view taken along the line AA in FIG. 1B, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 1B. In the metal cable connection structure 1, a pair of multi-core cables 5a and 5b are connected.

  The metal cable connection structure 1 mainly includes a closure 3, multi-core cables 5a and 5b, a sheath holding portion 9, a connecting member 11, a coating resin 13, and the like. The closure 3 is a case-like member that covers the connection portion, and the multi-core cables 5a and 5b penetrate the side surfaces, thereby preventing water from entering the inside.

  The multi-core cables 5a and 5b are multi-core metal cables, and a plurality of covered cables 17 are covered with a sheath 7 as shown in FIG. The covered cable 17 is an insulating covered cable, and is covered by the sheath 7 at a time. The sheath 7 is made of resin.

  As shown in FIG.1 (b), connector fitting part 15a, 15b is connected to each edge part of a pair of multi-core cable 5a, 5b. That is, the plurality of covered cables 17 are electrically connected to the connector fitting portions 15a and 15b, respectively. The connector fitting portions 15a and 15b are general connector fitting portions (plugs or receptacles) for multi-core, and are electrically connected to each other by male and female fitting.

  From the end portions (connector fitting portions 15a, 15b) of the multi-core cables 5a, 5b to the rear (hereinafter, the direction from the connector fitting portion side to the longitudinal direction on the other end side is referred to as the rear), a predetermined range ( In the section of length L in FIG. 1 (b), the sheath 7 is peeled off to form a cable exposed portion 19 through which the inner covered cable 17 is exposed.

  A sheath holding portion 9 that holds the sheath 7 is provided behind the cable exposed portion 19. The sheath holding portion 9 is, for example, a member divided into two parts, and is joined at a joint portion (not shown) into a ring shape. The sheath 7 (multi-core cables 5a, 5b) is sandwiched from the outside, and the axial direction of the sheath 7 Fixed against. The sheath holding portions 9 provided in each of the multi-core cables 5 a and 5 b are connected by a connecting member 11. That is, the multicore cables 5 a and 5 b are connected to each other via the sheath holding portion 9 by the connecting member 11. Therefore, stress in the longitudinal direction is prevented from being applied to the vicinity of the connector fitting portion.

  The cable exposed portion 19 and the connector fitting portions 15a and 15b are integrally covered with the covering resin 13. That is, the coating resin 13 can surely prevent water from entering the connecting portion. As the coating resin 13, for example, a urethane resin can be used. Although urethane resin does not have strength, it can ensure waterproofing and can be easily removed as necessary.

  Here, as shown in FIG. 2A, the cross section of the bundle of the sheathed cables 17 is circular, and virtual circles formed by connecting the centers of the sheathed cables 17 located on the outermost periphery (dotted circles in the figure). ) Is set to D. In this case, the length L of the cable exposed portion 19 shown in FIG. 1B is desirably 2D to 4D.

  Next, a construction method of the metal cable connection structure 1 (a connection method of the multi-core cables 5a and 5b) will be described. First, as shown in FIG. 3, the sheath 7 near the end of each of the multi-core cables 5a and 5b is peeled off to form a cable exposed portion 19 having a predetermined length. Further, the respective covered cables 17 are connected to the connector fitting portions 15a and 15b. The above steps can be performed in advance in the factory. For this reason, skill is not required for the connection work of the connector fitting portion and the covered cable, and connection errors can be prevented.

  Each multi-core cable 5a, 5b is transported to the site and opposed to each other. At this time, the sheath holding portions 9 are respectively fixed to the rear of the cable exposed portion 19 (near the cable exposed portion 19).

  Next, as shown in FIG. 4, in each cable exposure part 19, the covered cable 17 is collectively twisted in the circumferential direction (arrow C direction and D direction in the figure). In addition, in the following figures, although the closure 3 is shown with a dotted line, you may attach the closure 3 last.

  FIG. 5 is an enlarged view of the vicinity of the connector fitting portions 15a and 15b in FIG. Usually, it is necessary to match each fitting position of a multi-fiber connector fitting part. For example, as shown to Fig.5 (a), unless the position of the fitting part 21a and the fitting part 21b is match | combined, a connector fitting part cannot be connected.

  However, it is extremely difficult to twist the multi-core cable in the circumferential direction at the site of the sheath 7. Therefore, in the present invention, as shown in FIG. 5 (b), the cable exposed portion 19 is formed, and the plurality of covered cables 17 are collectively twisted in the circumferential direction at a portion where the sheath 7 is not present, so that the fitting portions 21a, 21b. Can be aligned.

  Here, as described above, the length L of the cable exposed portion 19 is preferably L = 2D to 4D with respect to the core diameter D of the virtual circle, for the following reason. When focusing on the outermost coated cable 17 (hereinafter referred to as the outermost cable), tensile stress is applied to the connection portion with the connector fitting portion when the outermost cable is twisted in the circumferential direction.

For example, as shown in FIG. 6, when the outermost peripheral cable twisted 360 ° in the circumferential direction is formed in a spiral shape with a pitch P (length in the axial direction), the circumferential length per pitch is If the diameter is D, Dπ corresponds to the outer peripheral length. Therefore, if the outermost peripheral cable total length (spiral length) per pitch is x, a relationship of x ² = P ² + (Dπ) ² is obtained. Here, for example, if the change rate K of the length is calculated from the difference between the axial linear length (= P) and the helical length (x) when twisted, K = (x−P) / P. .

Therefore, K = {(P ² + (Dπ) ² ) ^ (0.5) −P} / P = {1 + π ² (D / P) ² } ^ (0.5) −1. For example, if K is set to 7.5% or less so that excessive tensile stress is not applied to the connection portion with the connector fitting portion, D / P is set to 1/8 or less (P = 8D or more). good. If D / P is 1/8, the above-mentioned K is about 7.43%. For example, if the core diameter D is 30 mm, P may be 240 mm (8D).

  Here, the position of the fitting portion between the connector fitting portions may be twisted in the opposite direction to each other so that one connector fitting portion side has a movable range of 180 °. good. Therefore, it is only necessary that the connector fitting portion can be twisted by 90 ° (ie, 1/4 pitch). That is, in order not to give excessive tensile stress to the connection part with the connector fitting part, in order to make the above-mentioned rate of change in length 7.5% or less, the axial linear length of the part where the cable is twisted is set to What is necessary is just to be 2D or more. That is, the length L of the cable exposed portion 19 may be 2D or more.

  In addition, when the cable exposure part length is too long (for example, it becomes 4D or more), since the full length of a connection part becomes long, it is not desirable. Therefore, it is desirable that L = 2D to 4D.

  Next, as shown in FIG. 7, the connector fitting portions 15a and 15b are connected at a position where the mutual fitting portions are present.

  Next, as shown in FIG. 8, the coating resin 13 is provided so as to cover the cable exposed portion 19 and the connector fitting portions 15a and 15b integrally. For example, urethane resin is used as the coating resin 13. The covering resin 13 may be formed by, for example, installing a case member so as to cover the target portion and filling the case with resin using the case as a mold. The coating resin 13 ensures the waterproofness of the connecting portion. That is, waterproofing can be secured by both the closure 3 and the coating resin 13.

  Finally, the metal cable connection structure 1 is formed by connecting the sheath holding portions 9 with the connecting member 11.

  As described above, according to the metal connection structure 1 according to the present invention, it is possible to reliably ensure waterproofing. Further, since the connector fitting portion is connected in advance at a factory or the like using a multi-core metal cable, skill in connection work is not required, and connection mistakes can be prevented.

  Moreover, since the cable exposed part 19 is formed in the multi-core cable used in the present invention, the bundle of the covered cables 17 can be twisted together at the cable exposed part 19. For this reason, the fitting position of a connector fitting part can be match | combined. In addition, if L is larger than 2D, the fitting position alignment of the connector fitting parts is reliably possible.

  Further, since the sheath holding portions 9 are connected to each other by the connecting member, the stress in the axial direction can be received by the connecting member, and the stress applied to the connecting portion can be prevented. For this reason, it is not necessary to use a conventional epoxy resin or the like as the coating resin, and the strength as the coating resin is unnecessary.

  In addition, since the cable exposed portion and the connector fitting portion are integrally covered with the coating resin in a state where the cable exposed portion is twisted and the connector fitting portions 15a and 15b are connected, waterproofing can be secured and urethane type is used as the coating resin. If the resin is used, it is easy to remove the coating resin for confirmation of the connecting portion, repair, and the like.

  Next, a second embodiment will be described. 9 is a view showing the metal cable connection structure 30, FIG. 10A is a cross-sectional view taken along line FF in FIG. 9, FIG. 10B is a cross-sectional view taken along line GG in FIG. 9, and FIG. It is the HH sectional view taken on the line of FIG. Note that, in the following embodiment, configurations having the same functions as those of the metal cable connection structure 1 are denoted by the same reference numerals as those in FIG. The metal cable connection structure 30 has substantially the same configuration as the metal cable connection structure 1, but differs in that it has a corrugated pipe 33.

  In the multi-core cables 31 a and 31 b, the covered cable 17 is inserted into the corrugated tube 33, and the sheath 7 is formed on the outer periphery of the corrugated tube 33. The corrugated tube 33 is a corrugated tube made of, for example, an aluminum alloy. The corrugated tube 33 functions as a shield layer for protecting the covered cable 17 and noise.

  Since the corrugated tube 33 is included, it is extremely difficult to twist the multi-core cables 31a and 31b in the circumferential direction. However, in the present invention, as described above, the cable exposed portion 19 is formed, so And can be twisted. In addition, the cable exposure part 19 in this case refers to between the corrugated pipe 33 end part and the connector fitting parts 15a and 15b.

  In the metal cable connection structure 30, a corrugated tube exposed portion where the corrugated tube 33 is exposed is formed between the sheath portion 7 and the cable exposed portion 19 (behind the cable exposed portion 19).

  As shown in FIGS. 9 and 10B, corrugated tube holding portions 35 are provided in the corrugated tube exposed portions, respectively. The corrugated tube holding portion 35 is, for example, a half-shaped member, like the sheath holding portion 9, and is fixed to the corrugated tube 33 in the axial direction. The corrugated tube holding portion 35 is a conductor made of aluminum alloy or the like.

  The corrugated tube holding portions 35 are connected to each other by a connecting member 37 that is a conductor across the connecting portion. Unlike the connecting member 11 that connects the sheath holding portion 9, the connecting member 37 does not ensure the axial strength of the connecting portion. Therefore, strength is not necessary. For example, a metal wire may be used. The connecting members 37 connect the corrugated pipes 33, which are shield layers, to ensure the shielding characteristics of the entire cable.

  A fixing resin 39 is provided at the end of the corrugated tube 33 (near the boundary between the corrugated tube exposed portion and the cable exposed portion 19). The fixing resin 39 is, for example, an epoxy resin. The fixed resin 39 prevents the inner covered cable 17 from moving with respect to the corrugated pipe 33.

  Further, as shown in FIGS. 9 and 10C, the covering resin 13 is provided so as to integrally cover the fixing resin 39, the cable exposing portion 19, and the connector fitting portions 15a and 15b.

  In addition, although the connection method of the metal cable connection structure 30 is substantially the same as that of the metal cable connection structure 1, the corrugated tube exposure portion may be formed in advance as in the case of the cable exposure portion. Further, similarly to the sheath holding part 9, a corrugated tube holding part 35 may be provided. Further, the fixing resin 39 is provided before the covering resin 13 is provided (before the covering cable 17 is twisted), and the connecting member 11 may be provided after the covering resin 13 is further provided. The metal cable connection structure 30 is constructed as described above.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. In addition, the connector fitting portion can be connected in advance in the connecting portion of the multi-core cables 31a and 31b having the corrugated tube, and the fitting portion of the connector fitting portion can be easily aligned on site.

  Further, since the corrugated pipes 33 are electrically connected to each other, the shielding property can be ensured. Further, since the corrugated tube 33 and the covered cable 17 are fixed with the fixing resin 39 and further covered with the covering resin 13, the covered cable 17 and the corrugated tube 33 are securely fixed, and the connecting portion is easily removed. Possible, for example, urethane resins can be used.

  Next, a third embodiment will be described. FIG. 11A shows the metal cable branch adapter 40. The metal cable branch adapter 40 mainly includes a covered cable 43 and connector fitting portions 41a, 41b, and 41c.

  In the metal cable branch adapter 40, a plurality of covered cables 17 connected to a connector fitting portion 41a (first connector fitting portion) on one side are branched into two, and the other ends of the respective covered cables 17 Are connected to the connector fitting portions 41b and 41c (second connector fitting portions). Between the connector fitting part 41a and the connector fitting parts 41b and 41c, the covered cable 43 is exposed and a cable exposed part is formed. A space between the connector fitting portion 41a and the connector fitting portions 41b and 41c corresponds to the cable exposing portion 19 described above.

  In addition, although the example branched to two was shown as the metal cable branch adapter 40, you may branch to three or more.

  FIG. 11B is a view showing a metal cable connection structure 50 using the metal cable branch adapter 40. In the metal cable connection structure 50, multi-core cables 51a, 51b, 51c are mainly connected by a metal cable branch adapter 40.

  The multi-core cables 51a, 51b, 51c have the same configuration as the multi-core cable 5a described above. A connector fitting portion 55a is connected to the tip (covered cable 17) of the multi-core cable 51a. It is not necessary to provide the cable exposed portion 19 in the multi-core cable 51a. Similarly, connector fitting portions 55b and 55c are connected to the ends (covered cable 17) of the multi-core cables 51b and 51c, respectively. The multi-core cables 51b and 51c are arranged to face the multi-core cable 51a.

  The sheath holding part 9 is fixed to the outer periphery of the multi-core cable 51a. A sheath holding portion 53 is fixed to the outer periphery of the multi-core cables 51b and 51c. The sheath holding part 53 may be fixed to the outer periphery of each of the multi-core cables 51b and 51c with the same configuration as that of the sheath holding part 9, or the multi-core cables 51b and 51c may be fixed integrally. Also in this case, the sheath holding portion 53 may be divided into two and the multi-core cables 51b and 51c may be sandwiched together.

  The sheath holding part 53 and the sheath holding part 9 are connected by a connecting part 11. When the sheath holding part 53 is fixed to each of the multi-core cables 51b and 51c, the sheath holding part 9 is connected to each sheath holding part 53.

  The multi-core cable 51a and the multi-core cables 51b and 51c are connected by a metal cable branch adapter 40. That is, the connector fitting portion 55a and the connector fitting portion 41a are connected, and the connector fitting portions 55b and 55c are connected to the connector fitting portions 41b and 41c, respectively. At this time, it is necessary to match the fitting positions of the respective connector fitting portions, but the connector fitting can be achieved by twisting the exposed portions of the branched covered cable 43 of the metal cable branch adapter 40 in the circumferential direction. The position of the part can be adjusted.

  In addition, when the cable exposure part is not formed in the multi-core cable 51a and the multi-core cables 51b and 51c, it is necessary to match the fitting position of the connector fitting part on the metal cable branch adapter 40 side. For this reason, the cable exposed portion length L2 of the metal cable branch adapter 40 needs to correspond to a twist of 360 ° (forward / reverse 180 °) as described above. Accordingly, a length of about L2 = 4D to 8D, which is twice the cable exposed portion 19 described above, is required.

  According to the third embodiment, an effect similar to that of the first embodiment can be obtained. Moreover, also in a branch part, multi-core cables can be connected by a connector fitting part.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, a multi-core cable having a corrugated pipe in the metal cable connection structure 50 may be connected. In this case, in each multi-core cable, a corrugated tube exposed portion may be formed, a corrugated tube holding portion may be provided, and the corrugated tube holding portions may be inserted through each other. Further, when the corrugated tube exposed portion is formed, the corrugated tube exposed portion (corrugated tube) and the corresponding connector fitting portions 55a, 55b, and 55c may be fixed with a fixing resin.

1, 30, 50... Metal cable connection structure 3... Closures 5a and 5b... Multi-core cable 7 ... Sheath 9 ... Sheath holding part 11 ... Connecting member 13 ... Covering resin 15a, 15b ......... Connector fitting portion 17 ......... Covered cable 19 ......... Cable exposed portions 21a, 21b ......... Fitting portions 31a, 31b ......... Multi-core cable 33 ......... Corrugated pipe 35 ... ... Corrugated tube holding part 37 ..... Connecting member 39 ..... Fixing resin 40 ..... Metal cable branch adapters 41a, 41b, 41c ..... Connector fitting part 43 ..... Covered cables 51a, 51b, 51c ... ... multi-core cable 53 ..... sheath holding part 55a, 55b, 55c ..... connector fitting part

Claims (8)

A multi-core metal cable connection structure formed in a closure,
A cable exposure in which the plurality of insulation-coated cables are exposed in the vicinity of each end of a pair of multi-core metal cables including a plurality of insulation-coated cables and a sheath that collectively covers the plurality of insulation-coated cables. Each part is formed,
Connector fitting portions are provided at the ends of the plurality of insulation-coated cables,
A pair of the multi-core metal cables are connected by the connector fitting portion,
The sheath holding members that are provided behind the cable exposed portions and hold the sheath are connected to each other,
A multi-core metal cable connection structure, wherein at least the cable exposed portion and the connector fitting portion are covered with a coating resin.   When the cross section of the bundle of the plurality of insulation-coated cables is circular, and the center diameter of a virtual circle formed by connecting the respective centers of the insulation-coated cables located on the outermost periphery is D, the cable exposure portion The multi-core metal cable connection structure according to claim 1, wherein the length is 2D to 4D. The multi-core metal cable has a corrugated tube inside a sheath, and the plurality of insulation-coated cables are inserted into the corrugated tube,
Between each of the cable exposed portions and the portion where the sheath holding member is provided, a corrugated tube exposed portion where the corrugated tube is exposed is formed,
Each corrugated tube exposed portion is provided with a corrugated tube holding portion for holding the corrugated tube,
The multi-core metal cable connection structure according to claim 1 or 2, wherein the corrugated tube holding portions are connected to each other by a conductor.   The multi-core metal cable connection structure according to claim 3, wherein the vicinity of the boundary between the corrugated tube exposed portion and the cable exposed portion is fixed with an epoxy resin.   The multi-core metal cable connection structure according to claim 1, wherein the coating resin is a urethane resin. A method of connecting a multi-core metal cable,
Each of a pair of multi-core metal cables each including a plurality of insulation-coated cables, a sheath that collectively covers the plurality of insulation-coated cables, and a connector fitting portion provided at the tip of the plurality of insulation-coated cables In the vicinity of the end of each, forming a cable exposed portion where the plurality of insulation-coated cables are exposed,
A sheath holding member for holding the sheath is provided behind each cable exposed portion,
The connector fitting portions of the pair of multi-core metal cables are opposed to each other,
Twist the cable exposed part in the circumferential direction of the multi-core metal cable, match the fitting position of the connector fitting parts, connect the connector fitting parts,
A method for connecting multi-core metal cables, wherein at least the cable exposed portion and the connector fitting portion are covered with a coating resin that is a urethane-based resin, and the sheath holding members are coupled to each other. Multiple insulated cables;
A sheath for collectively covering the plurality of insulation-coated cables;
A connector fitting portion provided at the tip of the plurality of insulation-coated cables;
Comprising
A cable exposed portion is formed behind the connector fitting portion to expose the plurality of insulation-coated cables.
When the cross section of the bundle of the plurality of insulation-coated cables is circular, and the center diameter of a virtual circle formed by connecting the respective centers of the insulation-coated cables located on the outermost periphery is D, the cable exposure portion The length is 2D-4D,
A multi-core metal cable for railway signals, wherein the plurality of insulation-coated cables can be twisted together in the circumferential direction at the cable exposed portion. A cable branch adapter for railway signals used for branch connection of multi-core metal cables,
A first connector fitting portion;
A plurality of insulation-coated cables connected to the first connector fitting portion;
The plurality of insulation-coated cables are branched into a plurality, and the second connector fitting portions are respectively connected to the ends of the branched insulation-coated cables,
The insulation-coated cable between the first connector fitting portion and the second connector fitting portion is exposed;
When the cross-section of each of the plurality of branched insulated cables bundles is circular, and the center diameter of the virtual circle formed by connecting the centers of the outermost insulated cables is D, the insulation A cable branch adapter for a railway signal, wherein the length of the covered cable exposed is 4D to 8D.

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