JP5551637B2 - Protective cover for electrical wiring and how to attach the protective cover - Google Patents

Description

  The present invention relates to a protective cover for electrical wiring and a method for attaching the protective cover.

  Conventionally, in order to protect electrical wiring and the like and maintain insulation, the electrical wiring is coated with a resin such as vinyl or rubber. In addition, the wiring process may be performed in a so-called bare wire state so that the degree of freedom of wiring and the degree of freedom of processing are not impaired, and an insulation process or a protection process may be required later. Also, in response to the diversification and complexity of the electrical connection configuration, the frequency of using various types of electrical wiring such as flat image lines and flat mesh lines is increasing.

  For example, the following cited document 1 is an insulating cover that covers the outer periphery of a bare wire for the purpose of providing a bare wire insulating cover that can be mounted along the bend of the bare wire, An elastic material that provides a restoring force so that the insulation cover can be spirally attached to the outer periphery of the bare wire when the curled heel is opened on both side edges, with a diameter smaller than the outside diameter of the bare wire. A technical idea of a bare wire insulating cover configuration is disclosed.

  In addition, the structure disclosed in the cited document 1 has an insulating cover with high insulation properties, extremely good workability, excellent wearability, and is difficult to peel off due to climate, temperature, etc. In addition, existing jumper wires It can be easily retrofitted to bare wires, etc., the diameter after construction can be much smaller than conventional insulation covers, and the increase in wind pressure load can be reduced, and the bare wire's curvilinear It is described that it can be continuously applied along the sag, and there is an effect of the effect.

Japanese Patent Laid-Open No. 2003-244829

  For electrical wiring that has a particularly complicated shape, such as a portion bent at a right angle, it was difficult to attach a straight tube-shaped protective cover along the wiring shape later. In addition, after applying electrical wiring, if you want to improve insulation later, such as where the wiring density is high or where the distance from the housing is close, it is not possible to attach the insulating cover later. It was difficult from the viewpoint of safety and workability.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a protective cover for electrical wiring that can be easily and quickly mounted after electrical wiring processing. And

  The protective cover for electric wiring according to the present invention is a protective cover for electric wiring that includes a bendable bellows portion and a straight pipe portion, and includes a linear slit in the entire length direction in a natural state. To do.

  The protective cover for electrical wiring according to the present invention is preferably characterized in that the bellows part and the straight pipe part each include at least three layers of an inner resin layer, an electromagnetic wave shielding layer, and an outer resin layer. .

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the straight pipe portion is provided with a spacer that maintains a predetermined distance or more with the peripheral member.

  The protective cover for electric wiring according to the present invention is more preferably characterized in that the straight pipe portion has a screw hole portion erected so that the straight pipe portion can be screwed at a fixed interval with respect to the fixed object. To do.

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the straight pipe portion includes a fastening member capable of closing the slit in a state of including the electrical wiring.

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the electromagnetic wave shielding layer includes a mesh-like metal wire.

  The protective cover for electric wiring according to the present invention is more preferably characterized in that the spacer has a disk shape arranged on the circumference of the straight pipe portion.

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the screw hole portion is integrally formed with the straight pipe portion.

  Moreover, the protective cover for electrical wiring according to the present invention is more preferably characterized in that the fastening member is locked by being wound around the straight pipe portion at least once.

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the electrical wiring is a flat wire or a flat knitted wire.

  The protective cover for electrical wiring according to the present invention is more preferably characterized in that the outer diameter of the bellows portion and the outer diameter of the spacer of the straight pipe portion are the same.

  In addition, the method of attaching the protective cover of the electric wiring to the electric wiring according to the present invention includes a protective cover via a slit so that the bent portion and the bellows portion of the electric wiring correspond to the mounted electric wiring. And a step of fastening a fastening member capable of closing the slit in a state of including the electric wiring.

  Even after the electrical wiring process is performed, it is possible to provide a protective cover for electrical wiring that can be easily and quickly mounted later.

It is a conceptual diagram explaining the outline | summary of the straight tube | pipe part and bellows part of the protective cover of electrical wiring. It is a conceptual diagram explaining the outline | summary of the flat wire especially suitable for application of the protective cover of electrical wiring, and a flat braided wire. It is a conceptual diagram explaining the outline | summary of the straight pipe | tube part of the protective cover of electrical wiring. It is a conceptual diagram explaining the bending part outline | summary of the protective cover of electrical wiring. It is a figure which illustrates notionally the state where the straight pipe part of a different protective cover arrange | positioned adjacently in parallel maintains a predetermined space | interval mutually. It is a conceptual diagram explaining the state where the bellows part of the protective cover was bent, the screwing part, and the fixed binding band. It is a figure explaining in detail the screwing part with which a protection cover is provided. It is a flowchart explaining the example of a procedure which attaches the protective cover of electrical wiring. It is a figure explaining in detail the layer structure of a protective cover.

  The protective cover for electrical wiring described in the present embodiment is a resin cover that covers conductive wires such as flat wires and flat knitted wires, and prevents electrical leakage and enhances insulation from the surroundings. Dust and dirt can be prevented and durability and reliability can be improved.

  The protective cover for electrical wiring described in this embodiment is sandwiched between an outer resin layer provided with a plurality of disc-shaped spacers, an inner resin layer, and an outer resin layer and an inner resin layer. And at least a three-layer structure including an electromagnetic wave shielding layer.

  The electromagnetic wave shielding layer can be formed from, for example, a mesh-shaped metal or conductive resin, and can also be formed into a thin sheet shape. Moreover, the protective cover of this electrical wiring is provided with the bellows part, For example, it can coat | cover in the state bent according to the shape also about bending parts, such as a flat wire bent at right angle. .

  Furthermore, the protective cover for electrical wiring described in the present embodiment includes a straight slit in the longitudinal direction. And a protective cover can be coat | covered later via a slit with respect to the wired conductive wire. In that case, the straight conductive wire portion is covered so that the straight tube portion of the protective cover corresponds, and the bent conductive wire portion is covered so that the bellows portion of the protective cover corresponds. Therefore, the opening portion of the slit does not necessarily have an opening interval in a natural state, and may be a notch that is appropriately opened corresponding to the attaching / detaching operation to the conductive wire.

  In addition, the protective cover may include an integrally molded screw hole that can be screwed and fixed to a housing, a frame, or the like. In addition, the screw hole portion is erected at a predetermined height with respect to the protective cover main body so that the protective cover is fixed at a certain distance from the screwed housing or the like.

  In addition, the protective cover may include a fastening member that prevents and fixes the opening of the slit between the spacer of the straight pipe portion and the spacer by turning around and tightening in the pipe circumferential direction. The fastening member may typically be a binding band integrally provided on the protective cover. Further, the fastening member is only required to be capable of closing and fixing the slit in a state where the protective cover encloses the conductive wire, and the fastening member is configured to be engaged with both ends of the slit to be engaged. It may be.

  Therefore, the protective cover for electrical wiring according to the present embodiment will be described in detail below based on the drawings. FIG. 1 is a conceptual diagram illustrating an outline of straight pipe portions 1100 and 1300 and a bellows portion 1200 of a protective cover 1000 for electrical wiring.

  As shown in FIG. 1, the protective cover 1000 for electric wiring includes a bendable bellows portion 1200 and straight pipe portions 1100 and 1300 provided so as to sandwich the bellows portion 1200 on both sides. Both ends of the straight pipe portions 1100 and 1300 can be cut to an arbitrary length corresponding to the shape and length of the covered portion of the conductive wire to be protected. In this case, the lengths of the straight pipe portions 1100 and 1300 provided on both sides thereof are appropriately adjusted so that the bellows portion 1200 corresponds to the bent portion of the conductive wire.

  Further, as shown in FIG. 1B, the straight pipe portions 1100 and 1300 are provided with disc-like spacers 1010. The spacer 1010 contributes to maintaining the distance between the conductive wire to be coated and the surrounding area at or above the distance corresponding to the protrusion height of the spacer 1010. In addition, the spacer 1010 reduces wear and dirt caused by the electrical wiring protective cover 1000 coming into contact with the surroundings, and improves the durability of the electrical wiring protective cover 1000.

  FIG. 2 is a conceptual diagram for explaining the outline of a flat wire 2000 and a flat knitted wire 3000 that are particularly suitable for application of the protective cover 1000 for electrical wiring. FIG.2 (c) is the side view which observed the protective cover 1000 of the electrical wiring shown in FIG.2 (b) from the direction of the arrow.

  In the example shown in FIGS. 2A to 2C, the flat wire 2000 has a plurality of right-angled bent portions, and is a flat plate having a rectangular cross section as a whole. For this reason, for example, even if it tries to insert a heat contraction tube from an edge part, it will be blocked | interrupted by a bending part, and the subsequent mounting | wearing of a heat contraction tube is very difficult. In addition, if a protective cover using a spiral tube is to be attached, it is necessary to wind a large number of wires around the flat wire 2000, which requires a great number of man-hours, time and cost. Furthermore, when it is going to be attached later, it is more difficult to attach the spiral tube because surrounding wiring or the like becomes an obstacle.

  In the example shown in FIG. 2D, the flat knitted wire 3000 is integrally formed with the connection terminal 3100. For example, the flat knitted wire 3000 is known to be relatively flexible with respect to movement and vibration with the connection terminal 3100 as a fixed point. If the flat knitted wire 3000 is covered with a heat-shrinkable tube, the heat-shrinkable wire 3000 The flexible characteristic mentioned above will be inhibited remarkably by the fastening from the periphery by the tube.

  As described above, the protective cover 1000 for electrical wiring described in the embodiment can be detached from various conductive wires as shown in FIG. 2 without damaging the properties and functions of the conductive wires. Durability and insulation reliability can be improved.

  FIG. 3 is a conceptual diagram illustrating an outline of the straight pipe portion 1100 of the protective cover 1000 for electrical wiring. As shown in FIG. 3, the straight pipe portion 1100 is provided with a plurality of disk-like spacers 1010 arranged in the longitudinal direction.

  Further, if the width of the flat wire 2000 is W, the pipe outer diameter of the straight pipe portion 1100 is preferably 2 W, and the outer diameter of the spacer 1010 is preferably 3 W. Moreover, it is preferable that the pipe | tube internal diameter of the straight pipe | tube part 1100 in which the flat wire 2000 is accommodated shall be 1.5W or more.

  With such a configuration, since the tube thickness of the straight pipe portion 1100 is 0.5 W or less, the protective cover 1000 for electrical wiring is flexible enough to be easily attached to and detached from the flat wire 2000. Can be maintained. Further, the protective cover 1000 for electrical wiring is provided with a slit 1120 at one place in the circumferential direction. Therefore, the flat wire 2000 can be easily attached later through the slit 1120.

  The slits 1120 are preferably provided in a straight line in the longitudinal direction of the straight pipe portion 1100 from the viewpoint of ease of mounting work. Furthermore, the protective cover 1000 for electrical wiring has at least a three-layer structure including an inner resin layer, an electromagnetic wave shielding layer, and an outer resin layer sequentially from the inner side where the flat wire 2000 is included.

  By making the protective cover 1000 of the electrical wiring at least a three-layer structure, the electromagnetic wave is blocked by the electromagnetic wave shielding layer while maintaining good insulation between the enclosed rectangular wire 2000 and the surrounding wiring and housing, It becomes possible to reduce the occurrence of electromagnetic interference.

  FIG. 4 is a conceptual diagram illustrating an outline of the bent portion 1200 of the protective cover 1000 for electrical wiring. As shown in FIG. 4, the bent portion 1200 has a bellows shape that can be expanded and contracted in the longitudinal direction.

  In FIG. 4, the bent portion 1200 is provided so as to be sandwiched between the straight pipe portions 1100 and 1300, and either one or both of the straight pipe portions 1100 and 1300 has a shape, size, and length to be covered. Correspondingly, it may be cut and mounted as appropriate.

  Further, if the width of the flat wire 2000 is W, the outer diameter of the bent portion 1200 is preferably 2 W or more and 3 W or less. Moreover, it is preferable that the pipe internal diameter of the bending part 1200 in which the flat wire 2000 is accommodated be 1.5 W or more.

  With such a configuration, the tube thickness of the bent portion 1200 is 0.5 W or less in a cross section perpendicular to the longitudinal direction. Therefore, the bent portion 1200 can be attached to and detached from the flat wire 2000 relatively easily. Flexibility can be maintained. Further, the bent portion 1200 is provided with a slit 1220 at one place in the circumferential direction. Therefore, the flat wire 2000 can be easily attached later through the slit 1220.

  The slits 1220 are preferably provided in a straight line in the longitudinal direction of the bent portion 1200 from the viewpoint of ease of mounting work. Furthermore, the protective cover 1000 for electrical wiring also has a bent layer 1200 having at least a three-layer structure including an inner resin layer, an electromagnetic wave shielding layer, and an outer resin layer sequentially from the inner side where the flat wire 2000 is contained.

  The protective cover 1000 for the electrical wiring also has a three-layer structure at the bent portion 1200, so that the insulation between the enclosed rectangular wire 2000 and the surrounding wiring and housing is kept good, while the electromagnetic wave shielding layer. It is possible to block electromagnetic waves and reduce the occurrence of electromagnetic interference.

  In addition, the slits 1120 of the straight pipe portions 1100 and 1300 and the slit 1220 of the bent portion 1200 can be formed in a straight line continuously from the end to the end in the longitudinal direction of the protective cover 1000 of the electric wiring, and can be easily attached and detached. From the viewpoint of sex.

  FIG. 5 is a diagram conceptually illustrating a state in which the straight pipe portions 1100 (1) and 1100 (2) of different protective covers 1000 arranged adjacently in parallel hold a predetermined distance from each other. As shown in FIG. 5, the straight pipe portion 1100 (1) of the different protective cover 1000 is at least a protrusion height of 0.5 W or more of the spacer 1010 with respect to the housing 1500, for example, separated by about W, The flat wire 2000 (1) can be held.

  Further, the straight pipe portion 1100 (2) of the different protective cover 1000 is 3.5 W or more which is the sum of at least the protrusion height of the spacer 1010 and the spacer outer diameter of the straight pipe portion 1100 (1) with respect to the housing 1500. Thus, for example, the flat wire 2000 (2) can be held at a distance of about 4W.

  Further, as can be understood from FIG. 5, the straight pipe portion 1100 (1) and the straight pipe portion 1100 (2) have an interval of about 2 W which is the sum of the protrusion height and the pipe wall thickness of both spacers 1010. Each conductive line is held apart. In FIG. 5, it is preferable from the viewpoint of insulation and protection that the slits 1120 (1) and 1120 (2) for inserting and removing the flat wire 2000 are closed, but it is assumed that they are opened as shown. In addition, the space necessary for insulation is maintained by the presence of the spacer 1010.

  FIG. 6 is a conceptual diagram illustrating a state in which the bellows portion 1200 of the protective cover 1000 is bent, the screwing portion 1160, and the fixed binding band 1370. As shown in FIG. 6, the straight pipe portion 1100 (3) can be attached to the straight portion of the flat wire 2000 later.

  Further, the flat wire 2000 is attached so that the bellows portion 1200 of the protective cover 1000 corresponds to a portion where the flat wire 2000 is bent at a right angle. Since the bellows portion 1200 has a natural outer system of 3 W and an inner diameter of about 1.5 W or more, the included rectangular wire 2000 can maintain a sufficient distance from the surrounding wiring and the like even in the bellows portion 1200.

  FIG. 6 illustrates a configuration in which the protective cover 1000 includes two screwing portions 1160 and 1360 and two fixing binding bands 1170 and 1370. The screwing portions 1160 and 1360 are integrally formed with the straight pipe portions 1100 and 1300 in a state of being protruded to the same extent as or more than the spacer 1010 so that the protective cover 1000 can be fixed to a housing or a frame. Is provided. It should be noted that when protecting a movable wiring such as a flat knitted wire, it is not always necessary to screw it.

  Further, the fixing tie bands 1170 and 1370 are integrally provided between the spacers 1010 of the straight pipe portions 1100 and 1300. By tightening the binding band 1170, 1370 for fixing around the protective cover 1000 between the spacers 1010, the slits 1220 can be held and fixed in a closed state. Accordingly, it is possible to prevent the protective cover 1000 from dropping unintentionally, and to prevent dust and foreign matter from entering from the slit 1220, and it is possible to maintain a stronger insulating characteristic with high reliability. Further, since the fixing binding bands 1170 and 1370 are bound and bound between the spacers 1010 of the straight pipe portions 1100 and 1300, a new binding space is not required and space-saving fixing is possible.

  FIG. 7 is a diagram illustrating in detail the screwing portion 1160 included in the protective cover 1000. As shown in FIG. 7, the screwing portion 1160 is preferably provided integrally in a region where the spacers 1010 of the straight pipe portions 1100 and 1300 are not provided in part.

  In addition, the screwing portion 1160 has a straight pipe portion 1100, 1300 so that the distance between the protective cover 1000 and the housing 1500 to be screwed can be maintained at a position that is at least as high as the protruding height of the spacer 1010 or further apart. It is set as the structure standing up.

  In FIG. 7, for convenience of explanation, the periphery where the screwing portion 1160 is provided is shown as a configuration in which the spacer 1010 is completely removed. However, the spacer 1010 is only provided in the standing direction at the root portion of the screwing portion 1160. The spacer 1010 may be provided within a range compatible with the arrangement of the screwing portion 1160, such as providing a spacer 1010 in other peripheral portions.

  FIG. 8 is a flowchart illustrating an example of a procedure for attaching the protective cover 1000 for electrical wiring. Then, based on each step demonstrated in FIG. 8, the procedure which attaches the protective cover 1000 of an electrical wiring is demonstrated sequentially below.

(Step S810)
A predetermined electrical wiring connection process required for an electronic device or the like is performed. In this case, the electrical wiring may be a bare wire or may be covered with laminate, vinyl or the like. In addition, even if the electrical wiring connection process causes the electrical wiring to be densely packed in unexpected places or where there are small spaces between the housing and the frame and the electrical wiring, the electrical wiring will be delayed. Since no protective cover 1000 can be attached, there is no problem.

(Step S820)
If the predetermined electrical wiring connection process required for the electronic device or the like is completed, the process proceeds to step S830, and if the predetermined electrical wiring connection process required for the electronic device or the like is not completed. Advances to step S830.

(Step S830)
A protective cover 1000 is attached to the electrical wiring that has already been connected. In this case, electric wires such as a flat wire 2000 are inserted into the protective cover 1000 from the openings of the slits 1120 and 1220 so that the slits 1120 and 1220 are slightly opened.

(Step S840)
Fastening members such as the binding bands 1170 and 1370 are tightened to close the gaps between the slits 1120 and 1220, and the fastening members are fixed so that the protective cover 1000 does not fall off the electrical wiring. Since the straight pipe portions 1100 and 1300 and the bellows portion 1200 are integrally formed in the protective cover 1000, the concern that the protective cover 1000 may fall out of the electrical wiring can be eliminated by closing the gap between the slits 1120 and 1220.

  The fastening member is not limited to the binding bands 1170 and 1370, and may be a locking member or a lock mechanism that can close the gap between the slits 1120 and 1220.

(Step 850)
The two screwing portions 1160 and 1360 are screwed to the housing of the electronic device or the frame of the electronic device, respectively. As a result, the protective cover 1000 is held with a conductive wire included in the protective cover 1000 spaced apart from a mounting surface such as a housing by a predetermined interval that can reliably maintain insulation and noise.

  As described above, FIG. 8 exemplifies the attachment procedure of the protective cover 1000, and it is not always necessary to attach according to this procedure, and the procedure may be appropriately changed within the scope of the technical idea disclosed by the invention.

  FIG. 9 is a diagram illustrating the layer structure of the protective cover 1000 in detail. In FIG. 9, 1910 indicates an inner resin layer, 1920 indicates a conductive resin layer, and 1930 indicates an outer resin layer.

  As can be understood from FIG. 9, the protective cover 1000 employs a three-layer structure, so that it has an insulating property with respect to a conductive wire such as a flat wire 2000 and also to the outside such as a housing and other electric wiring. Has insulating properties. Further, the sandwiched conductive resin layer 1920 protects the conductive wire from the influence of various electromagnetic waves that come in, and the electromagnetic wave generated from the conductive wire oozes out of the protective cover 1000, causing electromagnetic interference and noise. Can be prevented.

  The conductive resin layer 1920 is not limited to a resin as long as it has a function of shielding electromagnetic waves, and a mesh metal, a metal sheet, a printed metal paste, or the like can be used.

  The above-described protective cover for electrical wiring is suitable for a laminated flat wire or a bare knitted flat wire. It is also suitable for bent parts that cannot be inserted with heat-shrinkable tubes, which has been difficult to handle with conventional heat-shrinkable tubes. Does not occur.

  In addition, when a heat-shrinkable tube is used for a flat mesh wire, insulation is ensured, but flexibility is impaired, and some of the important flexible characteristics required for a flat knitted wire do not function. . According to the protective cover proposed in this embodiment, the protective cover can be attached later without using a heat-shrinkable tube. Further, by forming the protective cover with a relatively soft resin having flexibility, it is possible to protect without narrowing the movable region of the flat knitted wire.

  In addition, since the protective cover includes the spacer, it is possible to maintain a safe distance from the adjacent wiring or housing without depending on the coating thickness of the protective cover. Moreover, since the electromagnetic wave shielding layer is provided, electromagnetic wave radiation from the conductive wire to be covered can be blocked, and electromagnetic noise radiation from the outside to the conductive wire can be blocked to reduce electromagnetic interference.

  Further, according to the protective cover of the embodiment, since it can be easily attached to the conductive wire through the slit, a large number of winding steps required for attaching the spiral tube are not required, and the attaching work is reduced and quick and easy. Can be easily removed.

  The above-described protective cover 1000 for electrical wiring is not limited to the description in the embodiment, and the configuration, operation, and procedural process are appropriately changed within the scope of the technical idea described in the present embodiment and in the obvious range. be able to.

  The present invention can be applied to an insulating cover or the like that is later attached to the electrical wiring of various electronic devices.

  1000 ·· Protective cover, 1010, 1220 ··· Spacer, 1100 · · Straight pipe portion, 1120, 1220 · · Slit, 1160, 1360 · · Screw fixing portion, 1170, 1370 · · Bundling band for fixing, 1200 · · Bend 1300 ··· Straight tube portion 1500 · · Case, 2000 · · Flat wire, 3000 · · Flat knitted wire, 3100 · · Connection terminal.

Claims (10)

A protective cover for electrical wiring comprising a bendable bellows part and a straight pipe part,
With a straight slit in the whole length direction in the natural state,
Each of the bellows part and the straight pipe part includes at least three layers of an inner resin layer, an electromagnetic wave shielding layer, and an outer resin layer,
The straight pipe portion includes a spacer that maintains a predetermined interval or more with a peripheral member,
When the larger width of the electric wiring is W, the outer diameter of the pipe is 2 W, which is twice that, the outer diameter of the spacer is 3 W, and the inner diameter of the straight pipe portion in which the electric wiring is accommodated. Is 1.5 W or more, and the tube thickness of the straight pipe portion is 0.5 W or less . In the protective cover for electrical wiring according to claim 1 ,
The straight pipe portion includes a screw hole portion erected so that the straight pipe portion can be screwed at a fixed interval with respect to a fixed object. In the protective cover for electrical wiring according to claim 1 or 2 ,
The straight pipe portion includes a fastening member capable of closing the slit in a state in which the electric wiring is included. In the protective cover for electrical wiring according to claim 1,
The electromagnetic wave shielding layer includes a mesh-like metal wire. In the protective cover for electrical wiring according to claim 1 ,
The said spacer is a disk shape arrange | positioned on the circumference of the said straight pipe part. The protective cover of the electrical wiring characterized by the above-mentioned. The protective cover for electrical wiring according to claim 2 ,
The screw hole part is integrally formed with the straight pipe part. An electrical wiring protective cover. In the protective cover for electrical wiring according to claim 3 ,
The protective cover for electrical wiring, wherein the fastening member is wound around at least one turn around the straight pipe portion. In the protective cover of the electrical wiring according to any one of claims 1 to 7 ,
The electrical wiring protective cover, wherein the electrical wiring is a flat wire or a flat knitted wire. In the protective cover of the electrical wiring according to any one of claims 1 to 8 ,
A protective cover for electrical wiring, wherein the outer diameter of the bellows portion and the outer diameter of the spacer of the straight pipe portion are the same. A method of mounting the electrical wiring protective cover according to any one of claims 1 to 9 on the electrical wiring,
Mounting the protective cover via the slit so that the bent portion of the electrical wiring and the bellows portion correspond to the mounted electrical wiring;
And a step of fastening a fastening member capable of closing the slit in a state in which the electric wiring is included.

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