JP2014138467A - Protective tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protective tube that can be easily fixed to an electric wire without using an insertion device for the protective tube.SOLUTION: The protective tube 10 can introduce an electric wire W inward from the outer peripheral direction thereof using an insulated operation rod 70 having a pair of open/close bending arms 7a and 7b on the end portion. The protective tube 10 comprises a lengthy main body 11 and a pair of flange portions 12 and 13. The pair of flange portions 12 and 13 protrude along the longitudinal direction of the main body 11 in an outer periphery and are firmly attached to each other. The pair of flange portions 12 and 13 have a pair of first recessed portions 14 and 15, into which end pawls 71a and 71b of the bending arms can be inserted from end sides of the flange portions 12 and 13, on end portions of an outer wall thereof. When the pair of end pawls 71a and 71b are inserted into the pair of the first recessed portions 14 and 15, and the pair of bending arms 7a and 7b, closed with a first open angle formed, are opened with the pair of flange portions 12 and 13 closed, end portions of the pair of flange portions 12 and 13 can be expanded.

Description

  The present invention relates to a protective tube. In particular, the present invention relates to a structure of a protective tube that can be attached to an aerial distribution line in an uninterrupted state using an insulating operation rod.

  For example, when an overhead distribution line is installed near the construction site, the overhead distribution line is covered with an insulating protective pipe (so-called “poly pipe”). Thereby, it can prevent that the apparatus for construction work contacts an overhead distribution line directly. Also, when there is a possibility that a tree branch or the like may come into contact with the overhead distribution line, a protective pipe is attached to the overhead distribution line, thereby preventing a ground fault.

  There are two types of hot-line work for installing protective pipes on overhead distribution lines in an uninterruptible state: direct hot-wire method and indirect hot-wire method. In the direct hot wire method, the worker wears protective equipment such as high-pressure rubber gloves and attaches a protective pipe by directly touching the overhead power distribution line. On the other hand, in the indirect hot wire construction method, an operator can attach a protective pipe without directly touching an aerial power distribution line using an insulating operation rod (hot stick) or the like. In recent years, a shift from a direct hot wire method to an indirect hot wire method is progressing from the viewpoint of improving the working environment.

  It is known that there are two types of work for installing the protective pipe by the indirect hot wire method, manual type and mechanical type using hydraulic pressure as a power source. As for the manual operation of mounting the protective tube, the first insulation operating rod (so-called Yatco) provided with a wedge-shaped adapter that can be opened from the cut of the protective tube on the gripping tool, and a hook-shaped hook at the tip There has been disclosed a method of mounting a protective tube, in which the protective tube is simply attached to and detached from the overhead distribution line using the attached second insulating operation rod (see, for example, Patent Document 1).

  On the other hand, as a work for installing a protective pipe using a mechanical protective pipe insertion machine, the protective pipe is brought into contact with the protective pipe by transporting the protective pipe along its conveying path by a rubber belt wound around a pair of sprockets. By increasing the area, the feeding force can be increased, the stability when the protective tube is fed can be improved, and the protective tube connector is engaged with the locking projections of the protective tube, leading to the connection between the protective tubes. There has been disclosed a protective tube insertion machine that can securely fix a protective tube and smoothly perform a connection operation with a subsequent protective tube (see, for example, Patent Document 2).

JP 2009-219326 A JP 2000-197225 A

  FIG. 10 is a plan view showing an example of a conventional operation for attaching a protective tube to an electric wire using a protective tube insertion machine. FIG. 10 of the present application corresponds to FIG. 21 of Patent Document 1. 11 is a diagram showing the configuration of a protection tube according to the prior art. FIG. 11 (A) is a front view of the protection tube, and FIG. 11 (B) is an XX arrow view of FIG. 11 (A). It is sectional drawing.

  Referring to FIG. 10, the protective tube insertion machine 100 is attached to the electric wire W. The protective tube insertion machine 100 includes a rail 101 and a separation plate 102. The rail 101 is disposed so as to extend obliquely below the electric wire W. When the protective tube 9 is inserted into the protective tube insertion machine 100 along the rail 101, the split portion of the protective tube 9 can abut against the separation plate 102 and can be expanded. And the protection pipe | tube 9 can be guided to the rail 101 and can reach the electric wire W in the state which maintained the state which the split part expanded.

  With reference to FIG. 10, the protective tire 9 guided by the rail 101 is sent out toward the electric wire W by rotationally driving a feed tire 103 provided in the protective tube insertion machine 100 with a hydraulic motor 104. Since the split portion of the protective tube 9 that has reached the electric wire W is expanded to form an expanded region, the electric wire W enters the expanded region when further fed by the feed tire 103, A protective tube 9 can be attached.

  Referring to FIG. 10, the above-described protective pipe mounting operation is performed by a plurality of workers boarding a bucket (not shown) provided in an aerial work vehicle. The insulating operation rod Hs1 is provided with a pair of support rollers 10r at an intermediate portion. The proximal end portion of the insulating operation rod Hs1 is fixed to the bucket, and the distal end portion of the insulation operation rod Hs1 is engaged with the electric wire W. Then, the rear end side of the protective tube 9 is supported by the support roller 10r.

  Referring to FIG. 10, the insulating operating rod Hs2 includes a pair of curved arms at the tip. The protection tube 9 can be sent out to the protection tube insertion machine 100 and the protection tube 9 can be attached to the electric wire W while holding the central portion of the protection tube 9 with the insulating operation rod Hs2.

  Referring to FIG. 10, the protective tube insertion machine 100 is connected to the distal end portion of the insulating operation rod Hs3. The protective tube insertion machine 100 is a heavy object. Therefore, although the protective tube insertion machine 100 is supported by the electric wire W, there is a problem that it is burdensome for an operator to continue to hold the insulating operation rod Hs3 in a state where the protective tube insertion machine 100 is mounted on the bucket. Furthermore, the conventional work of installing the protective tube has a problem that another worker who operates the insulating operation rod Hs2 is required.

  Next, the configuration of the protection tube 9 according to the prior art applied to the protection tube insertion machine 100 will be described. Referring to FIG. 11A, the protective tube 9 includes a main body portion 91, a first connection portion 92, and a second connection portion 93.

  Referring to FIG. 11A, the main body 91 is formed in a long cylindrical shape. The first connection portion 92 is formed on one end portion side of the main body portion 91, and has an insertion flange 92 a that can be inserted into the second connection portion 93 of the other protective tube 9 at the end portion. The 2nd connection part 93 is formed in the other end part side of the main-body part 91, and can expand an edge part so that the 1st connection part 92 of the other protective tube 9 can be inserted. Further, the second connection portion 93 forms an inflatable portion 93a in which the inner wall is expanded, into which the first connection portion 92 of the other protective tube 9 is inserted and into which the insertion flange 92a can be fitted.

  In general, the protective tube 9 is inserted into the electric wire W with the first connecting portion 92 as the head, and the insertion flange 92a of the subsequent protective tube 9 is fitted into the inflated portion 93a of the previous protective tube 9, so that a plurality of protective tubes 9 are provided. 9 can be arranged continuously.

  Referring to FIG. 11B, the protective tube 9 has a pair of flange portions 94a and 94b protruding in the outer peripheral direction along the longitudinal direction thereof. Usually, the pair of flanges 94a and 94b are in close contact with each other to close the inside of the protective tube 9. If it expands so that a pair of collar part 94a * 94b may be separated, the electric wire W can be inserted from an outer peripheral direction. Then, when the pair of flanges 94a and 94b are released, the protective tube 9 is elastically restored, and the electric wire W can be covered and protected.

  Further, referring to FIG. 11B, by expanding the inner diameter of the protective tube 9, the pair of flange portions 94a and 94b are expanded, and the electric wire W can be inserted from the outer peripheral direction. In the protective tube insertion machine 100 described above, the protective tube 9 is inserted into the electric wire W by expanding the inner diameter of the protective tube 9, and the pair of flanges 94a and 94b are in close contact with the split portion of the protective tube. It shows where to do.

  Referring to FIG. 11, the protection tube 9 according to the prior art is configured to be applicable to the protection tube insertion machine 100. Patent Document 1 describes that a protective tube can be attached to an electric wire without an uninterruptible state without using a protective tube insertion machine. However, it is necessary to operate two insulating operation rods in conjunction with each other. There is a need for a protective tube that can be easily attached to an electric wire in an uninterruptible state without using a protective tube insertion machine. The above can be said to be the subject of the present invention.

  This invention is made | formed in view of such a subject, and it aims at providing the protective tube which can attach a protective tube to an electric wire easily, without using a protective tube insertion machine.

  In order to introduce the electric wire into the inside of the cylindrical main body from the outer peripheral direction, the inventor has an insulating operation rod so that a pair of flanges projecting in the outer peripheral direction extends along the longitudinal direction of the protective tube. This problem can be solved by providing a pair of recesses on the outer walls of the pair of flanges and inserting these recesses on both ends of the protective tube. Based on this finding, the inventors have invented the following new protective tube.

  (1) A protective tube according to the present invention is a protective tube that can introduce an electric wire into the inside thereof from the outer peripheral direction using an insulating operation rod having a pair of curved arms that opens and closes at the tip, and is formed in a cylindrical shape. And a pair of eaves protruding in the outer circumferential direction along the longitudinal direction of the main body and close to each other to close the inside of the main body, and the pair of eaves With the pair of curved arms closed with a first opening angle, the distal claws of the curved arms have a pair of first recesses at the end of the outer wall that can be inserted from the distal edge side of the flange. Then, the pair of the curved arms are inserted into the pair of first recesses, and the pair of the curved arms are opened by providing a first opening angle in a state where the pair of hooks are closed. And the edge part of a pair of said collar part is expanded.

  (2) A second opening angle that is disposed on both wings of the pair of first recesses, opens to the side opposite to the tip edge of the pair of flanges, and the pair of curved arms is wider than the first opening angle. And a pair of second recesses into which the tip claws of these curved arms can be inserted beyond the main body, and the pair of second arm recesses into the pair of second recesses. When the pair of curved arms are opened by inserting and opening the pair of closed curved arms provided with a second opening angle in a state where the pair of collars are closed, it is preferable to widen the ends of the pair of collars.

  (3) It is preferable that one surface is exposed to the end surface side of the main body portion, and a first magnet that adsorbs the protective tube to each other in the longitudinal direction is attached to the first recess.

  (4) It is preferable that a second magnet that exposes one surface to the end surface side of the main body portion and adsorbs the protective tubes to each other in the longitudinal direction is attached to the second recess.

  (5) It is preferable that one said curved arm consists of a fixed arm and the other said curved arm consists of a movable arm.

  The protective tube according to the present invention is provided with a pair of recesses on the outer walls of the pair of hooks, into which the tip claws of a pair of open and closed curved arms provided at the tip of the insulating operation rod can be inserted, and these recesses are provided at both ends of the protective tube Since it is arranged in the section, the protective tube can be easily attached to the electric wire without using the protective tube insertion machine.

It is a perspective view which shows the structure of the protection pipe by one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the protective tube by the said embodiment. It is XX arrow sectional drawing of FIG. It is A arrow line view of FIG. 2, and has shown only one edge part of the protection pipe | tube. FIG. 5A is a front view of an insulating operation rod for gripping the protective tube according to the embodiment, FIG. 5A shows a proximal end side of the insulation operation rod, and FIG. 5B is a front end of the insulation operation rod. The part side is shown. It is the front view which expanded the front-end | tip part of the insulation operating rod for grasping the protection pipe | tube by the said embodiment, and is a state figure which opened a pair of curved arm most. It is the front view which expanded the front-end | tip part of the insulation operating rod for gripping the protection tube by the said embodiment, and is the state figure which provided the predetermined opening angle and closed a pair of curved arms. It is a front view which shows the use condition of the protective tube by the said embodiment, and is a state figure which inserted a pair of curved arm in a pair of 1st recessed part. It is a front view which shows the use condition of the protection tube by the said embodiment, and is a state figure which inserted a pair of curved arm in a pair of 2nd recessed part. It is a top view which shows an example of the conventional operation | work which attaches a protection pipe to an electric wire using a protection pipe insertion machine. It is a figure which shows the structure of the protection tube by a prior art, FIG. 11 (A) is a front view of a protection tube, FIG.11 (B) is XX arrow sectional drawing of FIG. 11 (A).

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of protective tube]
Initially, the structure of the protection pipe | tube by one Embodiment of this invention is demonstrated.

  FIG. 1 is a perspective view showing a configuration of a protective tube according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing the structure of the protective tube according to the embodiment. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 4 is a view taken in the direction of arrow A in FIG. 2 and shows only one end of the protective tube.

  1 to 4, a protective tube 10 according to an embodiment of the present invention includes a long main body 11 and a pair of flanges 12 and 13. The main body 11 is formed in a cylindrical shape. The main body 11 can introduce an electric wire W such as an aerial distribution line into the inside from the outer peripheral direction.

  Referring to FIGS. 1 to 4, the pair of flange portions 12 and 13 protrude in the outer peripheral direction along the longitudinal direction of the main body portion 11. Usually, the pair of flange portions 12 and 13 are in close contact with each other and close the inside of the main body portion 11. If it expands so that a pair of collar parts 12 and 13 may be spaced apart, the electric wire W can be inserted from an outer peripheral direction. And if a pair of collar part is released, the main-body part 11 will elastically return and it can cover and protect the electric wire W.

  Referring to FIG. 1 or FIG. 2, the electric wire W can be introduced into the main body 11 from between the pair of flanges 12 and 13 by expanding the pair of flanges 12 and 13. Moreover, the electric wire W can be derived | led-out from between a pair of collar parts 12 and 13 by expanding a pair of collar parts 12 and 13. FIG. An insulating operation rod 70 described later introduces the protective tube 10 to the electric wire W or leads the electric wire W from the protective tube 10 by expanding the pair of flange portions 12 and 13.

  Referring to FIGS. 1 to 4, the pair of flanges 12 and 13 extend a pair of first flanges 12 a and 13 a that extend in opposite directions from the base ends of the flanges 12 and 13. Further, the pair of flange parts 12 and 13 extend a pair of first opposing pieces 12b and 13b disposed to face the pair of flange parts 12 and 13 from the distal ends of the pair of first flange parts 12a and 13a. .

  Referring to FIG. 3 or FIG. 4, the flange 12 and the first opposing piece 12b are coupled by the first rib 12r, and the gap between the flange 12 and the first opposing piece 12b is partitioned by the first rib 12r. Similarly, the flange 13 and the first opposing piece 13b are coupled by the first rib 13r, and the flange 13 and the first opposing piece 13b are partitioned by the first rib 13r. One space defined by the first ribs 12r and 13r is a pair of first recesses 14 and 15 into which tip claws 71a and 71b of a pair of curved arms 7a and 7b described later can be inserted (see FIG. 2 or FIG. 8). The first magnet m1 is attached to the other space defined by the first ribs 12r and 13r (see FIG. 1 or FIG. 4).

  Referring to FIGS. 1 to 4, the pair of first opposing pieces 12 b and 13 b extend a pair of second flange pieces 12 c and 13 c from opposite ends of the first opposing pieces 12 b and 13 b in opposite directions. . Further, the second collar pieces 12c and 13c extend from the tip ends of the pair of second collar pieces 12c and 13c by extending the pair of second opposed pieces 12d and 13d that are disposed to face the pair of first opposed pieces 12b and 13b. ing.

  Referring to FIG. 3 or FIG. 4, the first opposed piece 12b and the second opposed piece 12d are joined by the second rib 16r, and the first opposed piece 12b and the second opposed piece 12d are partitioned by the second rib 16r. doing. Similarly, the first opposed piece 13b and the second opposed piece 13d are coupled by the second rib 17r, and the first opposed piece 13b and the second opposed piece 13d are partitioned by the second rib 17r. Then, a pair of second recesses 16. Into which one end claw 71 a, 71 b of a pair of curved arms 7 a, 7 b, which will be described later, can be inserted from the main body 11 side in one space defined by these second ribs 16 r, 17 r. 17 (see FIG. 3 or FIG. 9). The second magnet m2 is attached to the other space defined by the second ribs 16r and 17r (see FIG. 1 or FIG. 3).

  Referring to FIG. 1, FIG. 3, and FIG. 4, the first magnet m <b> 1 is attached to the first recesses 14 and 15 such that one surface thereof is exposed to the end surface side of the main body 11. The pair of first magnets m1 and m1 are arranged at both ends of the protective tube 10, and the end surfaces of the protective tube 10 can be brought together to adsorb a plurality of protective tubes 10 in the longitudinal direction.

  Referring to FIG. 1 or FIG. 3 and FIG. 4, the second magnet m <b> 2 is attached to the second recesses 16 and 17 so that one surface thereof is exposed to the end surface side of the main body 11. The pair of second magnets m2 and m2 are arranged at both ends of the protective tube 10, and the end surfaces of the protective tube 10 can be brought together to adsorb a plurality of protective tubes 10 to each other in the longitudinal direction. Note that a pair of first magnets m1 and m1 may be attached to the end of the main body 11, or a pair of second magnets m2 and m2 may be attached.

(Configuration of insulation operation rod)
Next, the configuration of the insulating operation rod for gripping the protective tube 10 according to the embodiment will be described. FIG. 5 is a front view of an insulating operation rod for gripping the protective tube according to the embodiment, FIG. 5 (A) shows the base end side of the insulation operation rod, and FIG. The tip end side of the operation rod is shown.

  FIG. 6 is an enlarged front view of the distal end portion of the insulating operating rod for gripping the protective tube according to the embodiment, and is a state diagram in which the pair of curved arms are most opened. FIG. 7 is an enlarged front view of the distal end portion of the insulating operation rod for gripping the protective tube according to the embodiment, and is a state diagram in which a pair of curved arms are closed with a predetermined opening angle.

  Referring to FIGS. 5 to 7, an insulating operating rod 70 (so-called insulating Yatco) serving as an indirect live tool is composed of a long operating rod 71 and a gripping tool 72. The gripping tool 72 is detachably attached to the distal end portion of the operation rod 71. Further, the insulating operation rod 70 includes an operation rod 73. The insulating operation rod 70 has an insulating property secured so that an intermediate portion between the operation rod 71 and the operation rod 73 is connected by an insulating plastic pipe or the like and is suitable for the indirect hot wire method.

  5 to 7, the gripping tool 72 is composed of a pair of curved arms 7a and 7b that open and close. One curved arm 7a is a fixed arm with a proximal end fixed, and the other curved arm 7b rotates around a rotation shaft 7c provided at the proximal end of one curved arm 7a. It is a movable arm.

  Referring to FIGS. 5 to 7, the operation bar 73 is held along the operation bar 71. The distal end portion of the operating rod 73 is rotatably connected to the other curved arm 7b. Then, when the operation lever 74 provided in the handle portion of the operating rod 73 is operated, the other curved arm 7b can be opened and closed with respect to the one curved arm 7a.

  Referring to FIG. 5, when the operation lever 74 is grasped and the operation lever 74 is brought close to the operation rod 71, the other curved arm 7b can be closed with respect to the one curved arm 7a. When the operation lever 74 is released, the other bending arm 7b can be opened with respect to one bending arm 7a by the force of a spring (not shown) connected to the operation lever 74. 4 or 5 shows a state in which the other curved arm 7b is opened to the maximum with respect to one curved arm 7a.

  Referring to FIG. 5, one curved arm 7a projects a tapered tip claw 71a. The tip claw 71a forms a gripping surface 70a. The gripping surface 70 a is disposed substantially parallel to the axis center of the operation rod 71. Similarly, the other curved arm 7b projects a tapered tip claw 71b. The tip claw 71b forms a gripping surface 70b. The gripping surface 70b is arranged with a predetermined opening angle with the gripping surface 70a. Referring to FIG. 5, when the operation lever 74 is gripped, the gripping surface 70b can be brought close to the gripping surface 70a. And an object to be grasped can be grasped.

[Operation of protective tube]
Next, the operation and effect of the protective tube 10 will be described while explaining a method of inserting an overhead distribution line into the protective tube using the insulating operation rod 70 according to the embodiment.

  FIG. 8 is a front view showing a use state of the protective tube according to the embodiment, and is a state diagram in which a pair of curved arms are inserted into a pair of first recesses. FIG. 9 is a front view showing a use state of the protective tube according to the embodiment, and is a state diagram in which a pair of curved arms are inserted into a pair of second recesses.

  Referring to FIG. 8, the pair of first recesses 14 and 15 are open toward the distal end edges of the pair of flanges 12 and 13. With the pair of curved arms 7a and 7b closed with a first opening angle, the pair of tip claws 71a and 71b can be inserted into the pair of first recesses 14 and 15. Next, when the pair of curved arms 7a and 7b closed by providing the first opening angle are opened, the ends of the pair of collars 12 and 13 can be expanded. And the electric wire W can be introduce | transduced into the inside of the main-body part 11 between a pair of collar parts 12 * 13 by expanding a pair of collar parts 12 * 13. Moreover, the electric wire W can be derived | led-out from between a pair of collar parts 12 and 13 by expanding a pair of collar parts 12 and 13. FIG.

  Referring to FIG. 9, the pair of second recesses 16, 17 are open on the side opposite to the tip edges of the pair of flanges 12, 13. With the pair of curved arms 7a and 7b closed with a second opening angle wider than the first opening angle, the pair of distal claws 71a and 71b are moved over the main body 11 and the pair of second recesses 16 and 17 can be inserted. Next, when the pair of curved arms 7a and 7b closed by providing the second opening angle are opened, the ends of the pair of collars 12 and 13 can be expanded. And the electric wire W can be introduce | transduced into the inside of the main-body part 11 between a pair of collar parts 12 * 13 by expanding a pair of collar parts 12 * 13. Moreover, the electric wire W can be derived | led-out from between a pair of collar parts 12 and 13 by expanding a pair of collar parts 12 and 13. FIG.

  As described above, the protective tube 10 according to the embodiment includes a pair of first concave portions 14 and 15 into which the front end claws 71a and 71b of the pair of curved arms 7a and 7b provided at the front end portion of the insulating operation rod 70 can be opened and closed. Alternatively, a pair of second recesses 16 and 17 are provided on the outer walls of the pair of flanges 12 and 13, and these recesses are disposed at both ends of the protection tube 10, so that the protection tube can be used without using a protection tube insertion machine. 10 can be easily attached to the electric wire W.

The protective tube according to the present invention has the following effects.
(1) Without using a protective tube insertion machine, it is possible to easily attach or remove the protective tube with only an insulating operation rod.
(2) The end portions of the pair of heel portions can be expanded from any direction on the heel portion side or the main body portion side.
(3) A plurality of protective pipes can be connected with magnets in the longitudinal direction.

  Although the present invention has disclosed a protective pipe capable of indirectly hot-working a high-voltage distribution line in an uninterruptible state using an insulating operation rod or the like, the protective pipe of the present invention is limited to indirect hot-wire construction. It is expected that it will be applied in other fields.

7a and 7b A pair of curved arms 10 A protective tube 11 A body portion 12 and 13 A pair of flange portions 14 and 15 A pair of first recesses 70 Insulating operation rods 71a and 71b A pair of tip claws W Electric wire

Claims (5)

Using an insulating operation rod having a pair of curved arms to open and close at the tip, a protective tube capable of introducing an electric wire into the inside from the outer peripheral direction,
A long main body formed in a cylindrical shape;
A pair of flanges protruding in the outer peripheral direction along the longitudinal direction of the main body, and closely contacting each other to close the inside of the main body,
The pair of hooks has a pair of first recesses in which the tip claws of the curved arms can be inserted from the tip edge side of the hook with the pair of the curved arms closed with a first opening angle. At the end of the outer wall,
When the pair of the curved arms are inserted into the pair of first recesses and the pair of the flanges are closed, the first pair of curved arms are opened by opening the pair of curved arms. A protective tube that expands the ends of the pair of flanges.
Protective tube. A pair of the first recesses are disposed on both wings and open to the opposite side of the pair of the flanges, and the pair of curved arms has a second opening angle wider than the first opening angle. In a closed state, the distal claws of these curved arms further comprise a pair of second recesses that can be inserted beyond the main body,
When the pair of the curved arms are inserted into the pair of second recesses, the pair of the hooks are closed, and the pair of curved arms are opened by providing a second opening angle, The protective tube according to claim 1, wherein the ends of the pair of flanges are expanded.   The protective tube according to claim 1 or 2, wherein one surface is exposed to the end surface side of the main body portion, and a first magnet for adsorbing the protective tube to each other in the longitudinal direction is attached to the first recess.   The protective tube according to claim 2, wherein one surface is exposed to the end surface side of the main body portion, and a second magnet that adsorbs the protective tube to each other in the longitudinal direction is attached to the second recess.   4. The protective tube according to claim 1, wherein one of the curved arms is a fixed arm, and the other curved arm is a movable arm.

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