Extension device

Abstract

To provide an extension device in which the width of the clamping portion can be arbitrarily adjusted and which has high versatility for the mounting environment. 【Solution means】The extension device 1 includes a cylindrical support portion 10, a clamping portion 20 that is supported at the base end of the support portion and is composed of a lower clamping portion 30 and an upper clamping portion 40 and can be attached to an attachment target, and a roller device 50 that is supported at the tip of the support portion 10. The lower clamping portion 30 has a hole through which the support portion 10 is inserted, and includes a first arm 31 that is slidably and fixably supported with respect to the support portion 10, and a tightening portion 32 that adjusts the width of the clamping portion.

Description

Technical Field

[0001] The present disclosure relates to an extension device.

Background Art

[0002] In an indoor cable extension method, there is known a method in which an extension roller is attached to a cable installation location such as a cable rack, and then a new cable is drawn into the extension roller.

[0003] Patent Document 1 discloses a cable rack fixing member that can easily fix a cable extension roller device as an extension roller to a main beam of a cable rack in an indoor cable extension work.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in Patent Document 1, although the width of the clamping portion that can be attached to the cable rack can be adjusted, it only corresponds to a plurality of predetermined widths. For this reason, there are limitations on the width of the cable rack to be attached, and it is difficult to attach it to anything other than the cable rack.

[0006] An object of the present disclosure is to provide an extension device in which the width of the clamping portion can be arbitrarily adjusted and which has high versatility in the mounting environment.

Means for Solving the Problems

[0007] To solve the above problems, an extension cord device according to one aspect of the present disclosure includes a cylindrical support portion, a clamping portion that is supported at the proximal end of the support portion and is composed of a lower clamping portion and an upper clamping portion and can be attached to an object to be attached, and a roller device that is supported at the distal end of the support portion. The lower clamping portion has a hole through which the support portion is inserted, and includes a first arm that is slidably and fixably supported with respect to the support portion, and a tightening portion that adjusts the width of the clamping portion.

Advantages of the Invention

[0008] According to the present disclosure, it is possible to provide an extension cord device in which the width of the clamping portion can be arbitrarily adjusted and that has high versatility in the mounting environment.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In all the drawings for describing the embodiments, the same reference numerals are given to common components, and repeated descriptions are omitted. Note that the following embodiments do not unduly limit the content of the present disclosure described in the claims. Also, not all the components shown in the embodiments are essential components of the present disclosure. Further, each drawing is a schematic diagram and is not necessarily drawn precisely.

[0011] Also, in the following description, when describing the same type of elements without distinction, reference numerals (or common reference numerals among the reference numerals) are used, and when describing the same type of elements by distinguishing them, identification numbers (or reference numerals) of the elements may be used.

[0012] <Overall Configuration> The extension device according to this embodiment is a device that can attach a roller device for cable extension to a cable installation location during the extension work of a newly installed communication cable for indoor use. The extension device includes a clamping portion that can be attached to an attachment target, and includes a roller device that can draw in a newly installed communication cable in a state of being attached to the cable installation location.

[0013] Hereinafter, a cable rack, which is a cable installation location, will be described as an example of the attachment target. Note that in this embodiment, the “high place” is not limited to a place with a height of 2 meters or more from the ground, but includes a place that is so high that an operator on the ground cannot reach it even by stretching out his hand. Also, in this embodiment, the “tip” indicates one end in the longitudinal direction, and the “base end” indicates the other end in the longitudinal direction.

[0014] The configuration of the extension device 1 according to this embodiment will be described. FIG. 1 is a perspective view showing the configuration of the extension device 1 of this embodiment. FIG. 2 is a view showing the extension device 1 of this embodiment attached to a cable rack.

[0015] As shown in Fig. 1, the extension device 1 includes a support portion 10, a clamping portion 20, and a roller device 50. The support portion 10 is a rectangular tube member extending in the longitudinal direction. The support portion 10 is formed such that even when the operator releases the hand while the extension device 1 is attached to the cable rack, it can support the respective parts of the extension device 1 and the load of the newly installed communication cable. The support portion 10 is formed of, for example, metal to support these weights. Also, it is formed of a magnetic material to which the first fixing portion 42 described later can be adsorbed. The clamping portion 20 is supported at the base end of the support portion 10 and is composed of a pair of clamping portions (lower clamping portion 30 and upper clamping portion 40). The roller device 50 is supported at the tip of the support portion.

[0016] As shown in Fig. 2, an operating rod 60 is connected to the base end of the lower clamping portion 30 of the extension device 1. Specifically, a hexagonal bit is provided at the base end of the lower clamping portion 30, and a socket for the hexagonal bit is provided at the tip of the operating rod 60. By fitting these, the extension device 1 and the operating rod 60 are connected. Also, a hole is provided at the base end of the support portion 10 of the extension device 1, and an operating rope 70 is inserted and connected to the hole.

[0017] Hereinafter, the extension operation by the extension device 1 according to the present embodiment will be described. First, the operating rod 60 is operated by an operator on the ground, and the extension device 1 is lifted up to the cable rack at a high place. At this time, although the hexagonal bit of the lower clamping portion 30 is fitted into the socket of the operating rod 60, it is in an unstable state because it is only fitted by the self-weight of the extension device 1. Therefore, by simultaneously pulling the operating rope 70 downward to apply tension, the extension device 1 can be pulled toward the operating rod 60, and the extension device 1 and the operating rod 60 can be stably connected.

[0018] Next, the extension device 1 is hooked on the main beam of the cable rack by the upper clamping portion 40. Then, by rotating the operating rod 60 by the operator, the lower clamping portion 30 is tightened and fixed to the main beam of the cable rack. After that, the newly installed communication cable is placed on the roller device 50 and pulled in, thereby performing the extension operation of the newly installed communication cable.

[0019] <Configuration of the clamping portion 20> The configuration of the clamping portion 20 according to the present embodiment will be described. FIG. 3 is a side view showing the configuration of the clamping portion 20 of the present embodiment. FIG. 4 is a front view showing the configuration of the clamping portion 20 of the present embodiment.

[0020] As shown in FIGS. 3 and 4, the clamping portion 20 includes a lower clamping portion 30 and an upper clamping portion 40. The lower clamping portion 30 and the upper clamping portion 40 form a space S and clamp the main girder of the cable rack.

[0021] The lower clamping portion 30 includes a first arm 31, a clamping portion 32, a clamping portion support portion 33, a lower mounting target support portion 34, and a spring 35. The lower clamping portion 30 is provided below the clamping portion 20 and clamps the main girder of the cable rack, which is the mounting target, from below.

[0022] The first arm 31 is a plate-like member that extends in a plane perpendicular to the longitudinal direction of the support portion 10. The first arm 31 has a hole through which the support portion 10 is inserted, and is supported so as to be slidable and fixable in the longitudinal direction with respect to the support portion 10. By sliding the first arm 31 in the longitudinal direction of the support portion 10, the width of the space S (the width of the clamping portion 20) is adjusted to a width suitable for the mounting target. The first arm 31 is formed of a mild steel material such as SS400, for example.

[0023] FIG. 5 is an enlarged side view of the first arm 31 of the present embodiment. Specifically, FIG. 5(a) is a view of the first arm 31 when no force is applied from the clamping portion 32, and FIG. 5(b) is a view of the first arm 31 when a force is applied from the clamping portion 32.

[0024] As shown in Fig. 5(a), the diameter of the hole of the first arm 31 is slightly larger than the diameter of the support portion 10. Therefore, when the support portion 10 passes through the hole of the first arm 31, a clearance (gap Δd) is provided between the support portion 10 and the inner surface of the hole of the first arm 31. As shown in Fig. 5(b), when a force is applied to the first arm 31 by the tightening portion 32 in this state, an angle of Δθ is generated on the inner surface of the hole of the first arm 31 with respect to the support portion 10. As a result, a part of the inner surface of the hole of the first arm 31 comes into contact with the support portion 10, and a part of the inner surface of the hole of the first arm 31 bites into the support portion 10, and the first arm 31 is fixed to the support portion 10.

[0025] As shown again in Figs. 3 and 4, the tightening portion 32 includes a bolt that passes through a hole provided in the first arm 31 on one side of the support portion 10, a nut provided corresponding to the hole at the lower part of the first arm 31, and a hexagonal bit connected to the base end of the bolt. The nut is welded to the lower part of the first arm 31. The hexagonal bit rotates by rotating the operating rod 60 with the socket of the operating rod 60 fitted, and accordingly, the bolt fits into the nut.

[0026] The tightening portion support portion 33 is provided at the upper part of the first arm 31 on one side of the support portion 10 and supports the tightening portion 32. The tightening portion support portion 33 has, for example, a U-shaped shape when viewed from the front, and lower attachment target support portions 34 are welded and provided at both upper ends thereof. A hole through which the bolt of the tightening portion 32 passes is provided at the bottom of the tightening portion support portion 33. A gap is formed between the tightening portion support portion 33 and the lower attachment target support portion 34, and the tip of the bolt of the tightening portion 32 is disposed in the gap. The tightening portion support portion 33 slides upward so as to be separated from the first arm 31 by tightening the tightening portion 32. The tightening portion support portion 33 is formed of, for example, a mild steel material such as SS400.

[0027] The lower attachment target support portion 34 is provided above the tightening portion support portion 33. As shown in FIG. 3, the lower attachment target support portion 34 has, for example, an L shape when viewed from the side. That is, the lower attachment target support portion 34 has a first portion extending along the longitudinal direction of the support portion 10 and a second portion protruding from the lower end of the first portion in the lateral direction of the support portion 10. As shown in FIG. 4, a pair of first portions of the lower attachment target support portion 34 are provided so as to sandwich the support portion 10 from both side surfaces in the lateral direction of the support portion 10 when viewed from the front. The second portion of the lower attachment target support portion 34 connects the pair of first portions at its lower end. Thereby, the lower attachment target support portion 34 is guided by the support portion 10 and is slidable up and down. The lower attachment target support portion 34 is formed of, for example, mild steel such as SS400.

[0028] The spring 35 is provided between the first arm 31 and the tightening portion support portion 33, and the bolt of the tightening portion 32 is inserted therethrough. The spring 35 has a function of buffering the tightening by the tightening portion 32 and preventing damage to the first arm 31 and the tightening portion support portion 33 due to tightening.

[0029] The upper clamping portion 40 includes a second arm 41, a first fixing portion 42, and an upper attachment target support portion 43. The upper clamping portion 40 is provided above the clamping portion 20 and clamps the main beam of the cable rack to be attached from above.

[0030] The second arm 41 is a plate-like member extending in a plane perpendicular to the longitudinal direction of the support portion 10. It has a hole through which the support portion 10 passes and is supported so as to be slidable and fixable in the longitudinal direction with respect to the support portion 10. By sliding the second arm 41 in the longitudinal direction of the support portion 10, the width of the space S is adjusted to the width suitable for the object to be attached. The second arm 41 is formed of, for example, metal. Further, the first fixing portion 42 is formed of a magnetic material capable of adsorption. Further, the second arm 41 faces one side of the support portion 10 and has a protruding portion protruding from the plate-like member in the longitudinal direction of the support portion 10.

[0031] Similar to the lower clamping portion 30, the diameter of the hole of the second arm 41 is slightly larger than the diameter of the support portion 10, and a play (gap Δd) is provided between the support portion 10 and the inner surface of the hole of the second arm 41. In this state, when a force is applied to the second arm 41 through the first arm 31 and the main beam of the cable rack by the tightening portion 24, a part of the inner surface of the hole of the second arm 41 comes into contact with the support portion 10. As a result, a part of the inner surface of the hole of the second arm 41 bites into the support portion 10, and the second arm 41 is fixed to the support portion 10.

[0032] The first fixing portion 42 is provided between the support portion 10 and the protruding portion of the second arm 41, and fixes the support portion 10 and the second arm 41. The first fixing portion 42 is a magnet. The first fixing portion 42 is adhered to the protruding portion of the second arm 41 and is attracted to the support portion 10 by magnetic force.

[0033] The upper mounting target support portion 43 is provided at the lower part of the second arm 41. As shown in FIG. 3, the upper mounting target support portion 43 has an L shape when viewed from the side. That is, the upper mounting target support portion 43 has a first portion extending along the longitudinal direction of the support portion 10 and a second portion protruding in the short direction of the support portion 10 from the upper end of the first portion. As shown in FIG. 4, a pair of the first portions of the upper mounting target support portion 43 are provided so as to sandwich the support portion 10 from both side surfaces in the short direction of the support portion 10 when viewed from the front. The second portion of the upper mounting target support portion 43 connects the pair of first portions at its upper end. Thereby, the upper mounting target support portion 43 is guided by the support portion 10 and can slide up and down. The upper mounting target support portion 43 is formed of a mild steel material such as SS400, for example.

[0034] In attaching the clamping portion 20 to the cable rack, first, each of the first arm 31 and the second arm 41 is slid so that a sufficient width of the space S is secured to accommodate the cable rack. In this state, by operating the operating rod 60 and the operating rope 70, the upper attachment target support portion 43 of the upper clamping portion 40 is hooked from the upper surface side of the main girder of the cable rack. Then, by rotating the operating rod 60 in the circumferential direction, the tightening portion 32 of the lower clamping portion 30 is tightened and the position of the lower attachment target support portion 34 is adjusted, and the main girder of the cable rack is clamped.

[0035] <Configuration of the roller device 50> The configuration of the roller device 50 according to the present embodiment will be described. FIG. 6 is a side view showing the configuration of the roller device 50 of the present embodiment. FIG. 7 is a front view showing the configuration of the roller device 50 of the present embodiment. FIG. 8 is a top view showing the configuration of the roller device 50 according to the present embodiment.

[0036] As shown in FIGS. 6 to 8, the roller device 50 includes an arm 51, a second fixing portion 52, a roller portion 53, and a connecting portion 54.

[0037] The arm 51 is provided at the tip of the support portion 10 and includes a pair of third arms 51a and fourth arms 51b arranged in the longitudinal direction of the support portion 10. The third arm 51a is located on the upper side, and the fourth arm 51b is located on the lower side. The third arm 51a and the fourth arm 51b are plate-like members that extend in a plane perpendicular to the longitudinal direction of the support portion 10. Each of the third arm 51a and the fourth arm 51b has a hole through which the support portion 10 is inserted, and is supported so as to be slidable and fixable in the longitudinal direction with respect to the support portion 10. By sliding the third arm 51a and the fourth arm 51b in the longitudinal direction of the support portion 10, the height position of the roller device 50 can be adjusted. The third arm 51a and the fourth arm 51b are formed of mild steel materials such as SS400, for example. Further, each of the third arm 51a and the fourth arm 51b has a hole through which the second fixing portion 52 is inserted on the other side of the support portion 10, and each of the holes is provided at a corresponding position in a plane perpendicular to the longitudinal direction of the support portion 10.

[0038] The second fixing part 52 is inserted through holes provided in each of the third arm 51a and the fourth arm 51b on the other side of the support part. The second fixing part 52 is a male screw, and the holes in the third arm 51a and the fourth arm 51b are female screws. By tightening the second fixing part 52, the second fixing part 52 fits into the third arm 51a and the fourth arm 51b.

[0039] Similar to the lower clamping part 30, the diameter of each hole in the third arm 51a and the fourth arm 51b is slightly larger than the diameter of the support part 10, and a play (gap Δd) is provided between the support part 10 and the inner surfaces of the holes in the third arm 51a and the fourth arm 51b respectively. In this state, when a force is applied to the third arm 51a and the fourth arm 51b by the second fixing part 52, an angle is generated between the third arm 51a and the fourth arm 51b, and a part of the inner surface of each hole in the third arm 51a and the fourth arm 51b comes into contact with the support part 10. As a result, a part of the inner surface of each hole in the third arm 51a and the fourth arm 51b bites into the support part 10, and the third arm 51a and the fourth arm 51b are fixed to the support part 10.

[0040] The roller part 53 includes a shaft 53a, a plurality of rollers 53b, a spring 53c, and a hexagonal nut 53d. The roller part 53 is supported by a connecting part 54 on one side of the support part 10.

[0041] The shaft 53a is a J-shaped metal piece. The shaft 53a has a curved part (semicircular part) at the bottom, a long shaft part at one end of the curved part, and a short shaft part at the other end. The long shaft part of the shaft 53a is supported by the connecting part 54 on one side of the support part 10. The shaft 53a is rotatable around the axis of the long shaft part in a state of being pushed upward at the upper part.

[0042] The plurality of rollers 53b are provided on the curved portion and the short-axis portion of the shaft 53a. The plurality of rollers 53b have the shaft 53a inserted therein and are rotatably attached in the circumferential direction of the shaft 53a. In the cable extension operation, by placing the newly installed communication cable on the plurality of rollers 53b, the plurality of rollers 53b serve as a guiding surface, and the newly installed communication cable is drawn in by the rotation of the plurality of rollers 53b.

[0043] The spring 53c is provided between the roller 53b at the outermost end on the long-axis portion side among the plurality of rollers 53b and the connecting portion 54. The long-axis portion of the shaft 53a is inserted through the spring 53c. When the shaft 53a is pushed upward and rotated, the spring 53c returns the shaft 53a to its original position by the spring force, thereby fitting the hexagonal nut 53d into the hexagonal nut holder 54d and fixing the rotation position.

[0044] The hexagonal nut 53d is connected to the upper end of the long-axis portion of the shaft 53a. The long-axis portion of the shaft 53a passes through the hole of the roller portion support portion 54c of the connecting portion 54, and the hexagonal nut 53d is supported above the roller portion support portion 54c. Further, the hexagonal nut 53d is held by the hexagonal nut holder 54d so that the opposing side surfaces fit. Thereby, the hexagonal nut 53d is fixed by adjusting the angle by 60 degrees each time the shaft 53a is pushed upward and rotated.

[0045] The connecting portion 54 includes a fifth arm 54a, a rotating shaft 54b, a roller portion support portion 54c, and a hexagonal nut holder 54d. The connecting portion 54 connects the third arm 51a and the roller portion 53.

[0046] The fifth arm 54a has a pair of arms, and one ends of the pair of arms are provided so as to sandwich the third arm 51a from both side surfaces. The pair of arms and the third arm 51a are connected by, for example, welding. The other ends of the pair of arms protrude to one side of the support portion 10 and are connected to the roller portion support portion 54c via the rotating shaft 54b.

[0047] The rotating shaft 54b connects the fifth arm 54a and the roller part support part 54c. The rotating shaft 54b extends in a direction (perpendicular direction) that is away from the support part 10 in the short side direction and perpendicular to the longitudinal direction. By rotating around its axis, the rotating shaft 54b can rotate the roller part support part 54c and the roller part 53 supported thereby by 180 degrees.

[0048] The roller part support part 54c is connected to the rotating shaft 54 and supports the roller part 53. The roller part support part 54c has a hole through which the shaft 53a of the roller part 53 is inserted, and supports a hex nut 53d at its upper part.

[0049] The hex nut holder 54d is provided at the upper part of the roller part support part 54c and supports the hex nut 53d. The hex nut holder 54d holds the hex nut 53d such that the opposing side surfaces of the hex nut 53d fit therein.

[0050] <Parentheses> As described above, the extension device 1 in the present embodiment includes a lower clamping part 30 and an upper clamping part 40 supported at the base end of the cylindrical support part 10, and a roller device 50 supported at the tip end. The lower clamping part 30 has a hole through which the support part 10 is inserted, and includes a first arm 31 that is slidably and fixably supported with respect to the support part 10, and a tightening part 32 that adjusts the width of the clamping part 20. Thereby, the width of the clamping part 20 can be adjusted in two steps, namely, the sliding of the first arm 31 and the tightening by the tightening part 32. Therefore, the width of the clamping part can be arbitrarily adjusted, and the versatility for the mounting environment can be enhanced.

[0051] Also, in the extension device 1 in the present embodiment, the upper clamping part 40 includes a second arm 41 that has a hole through which the support part 10 is inserted and is slidably and fixably supported with respect to the support part 10. Thereby, not only the lower clamping part 30 but also the upper clamping part 40 can adjust the width of the clamping part 20, and the versatility for the mounting environment can be further enhanced.

[0052] In addition, the extension device 1 in the present embodiment is provided between the support portion 10 and the second arm 41, and includes a magnet capable of fixing the support portion 10 and the second arm 41. Thereby, the fixing force of the second arm 41 with respect to the support portion 10 can be increased, and it is possible to suppress the extension device 1 from coming off the cable rack during the extension work.

[0053] In addition, in the extension device 1 in the present embodiment, the roller device 50 has a hole through which the support portion 10 is inserted, is slidably and fixably supported with respect to the support portion 10, and includes a pair of third arms 51a and fourth arms 51b arranged in the longitudinal direction of the support portion 10, and a second fixing portion 52 that fixes the support portion 10, the third arm 51a, and the fourth arm 51b. Thereby, the height of the roller device 50 can be arbitrarily adjusted, and the roller device 50 can be appropriately arranged according to the working environment such as the cable rack or its accessories and supports in the cable extension work.

[0054] In addition, in the extension device 1 in the present embodiment, the connection portion 54 includes a rotary shaft 54b that is orthogonal to the longitudinal direction of the support portion 10 and is capable of rotating the roller portion 53 around the axis. Thereby, the roller portion 53 can be rotated 180 degrees, and the newly installed communication cable placed on the roller portion 53 can be easily dumped into the cable rack after the cable extension work.

[0055] (Modification example) FIG. 9 is a side view showing a first modification example of the extension device 1 of the present embodiment. As shown in FIG. 9, in the first modification example, the lower clamping portion 30 may include a guide 36. The guide 36 is provided so as to cover the periphery of the support portion 10 and connects a pair of first portions of the lower attachment target support portion 34. Thereby, it is possible to suppress the lower attachment target support portion 34 from greatly deviating from the support portion 10. The guide 36 is formed of a metal such as mild steel material such as SS400.

[0056] FIG. 10 is a side view showing a second modification of the extension device 1 of the present embodiment. In the above embodiment, the nut of the tightening portion 32 was welded to the lower portion of the first arm 31, but the present invention is not limited to this. As shown in FIG. 10, in the second modification, the lower clamping portion 30 may include a nut holder 37. The nut holder 37 has, for example, a U-shaped cross-section when viewed from the front, and the lower portions of the first arms 31 are welded to the upper portions of both ends thereof. A hole through which the bolt of the tightening portion 32 is inserted is provided at the bottom of the nut holder 37. A gap is formed between the nut holder 37 and the first arm 31, and the nut of the tightening portion 32 is disposed in the gap without being welded to the first arm 31. That is, the nut is movable arbitrarily along the bolt within the gap. Thereby, when a force is applied to the first arm 31 by the tightening portion 32, the angle Δθ between the inner surface of the hole of the first arm 31 and the support portion 10 can be made sufficiently large, and the fixing force of the first arm 31 with respect to the support portion 10 can be increased. The nut holder 37 is formed of a metal such as mild steel such as SS400.

[0057] Further, in the above embodiment, the operating rod 60 was rotated by the hand of the operator, but the present invention is not limited to this. For example, the operating rod 60 may be connected to a power tool and rotated by the power tool to tighten the tightening portion 32.

[0058] Further, in the above embodiment, the tightening portion 32 has a hexagonal bit and is tightened by the socket of the operating rod 60, but the present invention is not limited to this. For example, a male screw may be provided instead of the hexagonal bit, and the tip of the operating rod 60 may be a female screw.

[0059] Further, in the above embodiment, each component was formed of a metal such as mild steel such as SS400, but the present invention is not limited to this. Each component may be made of a material that can withstand the stress during cable extension. For example, it may be carbon or aluminum for weight reduction.

[0060] Further, in the above-described embodiment, the support portion 10 was formed as a rectangular tube extending in the longitudinal direction, but the present invention is not limited thereto. The support portion 10 may be a rod-shaped member extending in the longitudinal direction, and for example, it may be a cylinder.

[0061] Also, in the above-described embodiment, the roller device 50 had its roller portion 53 composed of a J-shaped shaft 53a and a plurality of rollers 53b, but the present invention is not limited thereto. For example, the roller device 50 may be composed of one pulley or the like capable of extending the cable.

[0062] Further, in the above-described embodiment, the lower attachment target support portion 34 and the upper attachment target support portion 43 directly contact and sandwich the main girder of the cable rack, but the present invention is not limited thereto. For example, a protective member may be provided on the surfaces of the lower attachment target support portion 34 and the upper attachment target support portion 43. Thereby, when the main girder of the cable rack is sandwiched by the lower attachment target support portion 34 and the upper attachment target support portion 43, damage to the cable rack can be prevented.

[0063] Also, in the above-described embodiment, the roller device 50 was attached to the main girder of the cable rack, but the present invention is not limited thereto. The attachment target of the roller device 50 may be anything that can be fixed by the sandwiching portion 20, and for example, it may be an accessory or a support of the cable rack.

[0064] Also, in the above-described embodiment, the extension work of the indoor communication cable was the target, but the present invention is not limited thereto. For example, an electric wire, which is an example of a cable, may be the target of the extension work.

[0065] As described above, some embodiments of the present disclosure have been described, but these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are to be included in the scope and gist of the invention, and are also to be included in the invention described in the claims and the equivalent scope thereof.

[0066] <Supplementary Note> The matters described in each of the above embodiments are appended below.

[0067] (Appendix 1) A cylindrical support portion, A clamping portion that is supported at the proximal end of the support portion and is composed of a lower clamping portion and an upper clamping portion and can be attached to an object to be attached, A roller device supported at the distal end of the support portion, Comprising: The lower clamping portion has a hole through which the support portion passes, and a first arm that is slidably and fixably supported with respect to the support portion, A tightening portion for adjusting the width of the clamping portion, An extension device including:

[0068] (Appendix 2) A gap is provided between the support portion and the first arm, The support portion and the first arm are fixed by abutting a part of the support portion and a part of the first arm by tightening the tightening portion The extension device according to claim 1.

[0069] (Appendix 3) The upper clamping portion has a hole through which the support portion passes, and includes a second arm that is slidably and fixably supported with respect to the support portion The extension device according to claim 1.

[0070] (Appendix 4) A gap is provided between the support portion and the second arm, The support portion and the second arm are fixed by abutting a part of the support portion and a part of the second arm by tightening the tightening portion The extension device according to claim 3.

[0071] (Appendix 5) The upper clamping portion is provided between the support portion and the second arm, and includes a first fixing portion capable of fixing the second arm with respect to the support portion The extension device according to claim 3.

[0072] (Appendix 6) The first fixing part is a magnet. The extension device according to claim 5.

[0073] (Appendix 7) The roller device is provided with a hole through which the support part is inserted, and is supported so as to be slidable and fixable with respect to the support part, and a pair of third arms and fourth arms arranged in the longitudinal direction of the support part; a second fixing part capable of fixing the pair of third arms and fourth arms to the support part; The extension device according to claim 1, including the above.

[0074] (Appendix 8) The roller device is a roller part on which a cable for extension is placed; a connecting part connecting the roller part and the pair of third arms and fourth arms; The extension device according to claim 7, including the above.

[0075] (Appendix 9) The connecting part includes a rotating shaft orthogonal to the longitudinal direction of the support part and capable of rotating the roller part around the axis. The extension device according to claim 8.

Explanation of Reference Numerals

[0076] 1 ··· Extension device 10 ··· Support part 20 ··· Clamping part 30 ··· Lower clamping part 31 ··· First arm 32 ··· Tightening part 33 ··· Tightening part support part 34 ··· Lower mounting target support part 35 ··· Spring 36 ··· Guide 37 ··· Nut holder 40 ··· Upper clamping part 41 ··· Second arm 42 ··· Fixed part 43 ··· Upper mounting target support part 50 ··· Roller device 51 ··· Arm 51a ··· Third arm 51b ··· Fourth arm 52 ··· Second fixed part 53 ··· Roller part 53a ··· Shaft 53b ··· Roller 53c ··· Spring 53d ··· Hexagon nut 54 ··· Connection part 54a ··· Fifth arm 54b ··· Rotation shaft 54c ··· Roller part support part 54d ··· Hexagon nut holder 60 ··· Operating rod 70 ··· Operating rope S ··· Space

Claims

1. A cylindrical support portion, a clamping portion supported at the proximal end of the support portion and composed of a lower clamping portion and an upper clamping portion, and capable of being attached to an object to be attached, a roller device supported at the distal end of the support portion, comprising: the lower clamping portion has a hole through which the support portion is inserted, and a first arm slidably and fixably supported with respect to the support portion, a tightening portion for adjusting the width of the clamping portion, a wire extension device including the same.

2. A gap is provided between the support portion and the first arm, the support portion and the first arm are fixed by abutting a part of the support portion and a part of the first arm by tightening of the tightening portion. The wire extension device according to Claim 1.

3. The upper clamping portion includes a second arm having a hole through which the support portion is inserted and slidably and fixably supported with respect to the support portion. The wire extension device according to Claim 1.

4. A gap is provided between the support portion and the second arm, the support portion and the second arm are fixed by abutting a part of the support portion and a part of the second arm by tightening of the tightening portion. The wire extension device according to Claim 3.

5. The upper clamping portion is provided between the support portion and the second arm, and includes a first fixing portion capable of fixing the second arm with respect to the support portion. The wire extension device according to Claim 3.

6. The first fixing portion is a magnet. The wire extension device according to Claim 5.

7. The roller device, has a hole through which the support portion is inserted, and is slidably and fixably supported with respect to the support portion, and a pair of third arms and fourth arms arranged in the longitudinal direction of the support portion, and a second fixing portion capable of fixing the pair of third arms and fourth arms with respect to the support portion. The wire extension device according to Claim 1 including the same.

8. The roller device, includes a roller portion for placing a cable for wire extension, and a connecting portion connecting the roller portion and the pair of third arms and fourth arms. The wire extension device according to Claim 7 including the same.

9. The connecting portion includes a rotating shaft orthogonal to the longitudinal direction of the support portion and capable of rotating the roller portion around the axis. The wire extension device according to Claim 8.

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