Telescopic device and wire tensioning device

Abstract

The invention provides an expansion piece and a wire tensioning device which can simply and accurately execute wire tensioning work. According to one embodiment of the present invention, a retractor for use in stretching a wire is provided. The expansion piece includes an outer cylinder portion, an inner cylinder portion, an operation portion, a drive portion, and a position detection portion. The inner cylinder portion is inserted into the outer cylinder portion from one end in the axial direction. The operating part has a threaded shaft inserted through the outer cylinder part and the inner cylinder part, and a nut fixed to the other end of the inner cylinder part in the axial direction and screwed to the threaded shaft. The drive unit is configured so as to move the nut along the threaded shaft by rotating the threaded shaft as the axis center. The position detection section is provided on the outer peripheral side of the outer cylindrical section, and has at least one sensor for detecting the position of the nut.

Description

Technical Field

[0001] The invention relates to a telescoping device and a wire tensioning device. Background Art

[0002] When performing wire tensioning operations such as electrical engineering, railway maintenance, and fruit tree rack production, wire tensioners and retractors are generally used to clamp linear objects such as wires or electric wires. Patent document 1 discloses a retractor that is extended and shortened by manually rotating a bolt. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Publication No. 2018-11495 Summary of the invention Problems to be solved by the invention

[0004] However, the operation of rotating the bolt requires a great deal of force, and the degree of stretching of the linear body must be visually confirmed during the stretching operation, which requires skilled techniques. In view of the above circumstances, the present invention provides a retractor and a wire tensioning device that can perform wire tensioning work simply and accurately. Means of solving problems

[0005] According to one embodiment of the present invention, there is provided a retractor for use in stretching a wire. The retractor comprises an outer cylinder, an inner cylinder, a working portion, a driving portion, and a position detecting portion. The inner cylinder is inserted into the outer cylinder from one axial end. The working portion comprises a threaded shaft inserted through the outer cylinder and the inner cylinder, and a nut fixed to the other axial end of the inner cylinder and threadedly engaged with the threaded shaft. The driving portion is configured to move the nut along the threaded shaft by rotating the threaded shaft about the axis. The position detecting portion is disposed on the outer peripheral side of the outer cylinder, and comprises at least one sensor for detecting the position of the nut.

[0006] According to such an aspect, the retractor can be easily operated, and the wire tensioning work can be performed quickly and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is a front view showing a first embodiment of the thread tensioning device of the present invention. Figure 2 Yes means Figure 1 A three-dimensional view of the structure of the support member on the left side. Figure 3 Yes means Figure 1 A three-dimensional view of the structure of the support member on the right side of the middle. Figure 4 This is a longitudinal section showing the structure of the vicinity of the operating portion and the driving portion in the expander according to the first embodiment. Figure 5 It is a perspective view (internal perspective view) schematically showing the structure of the operating portion of the expander according to the first embodiment. Figure 6 This is a block diagram showing the configuration of a control substrate of the expander according to the first embodiment. Figure 7 It is a front view showing the structure of the main body tube portion side of the expandable joint according to the second embodiment. Figure 8 It is a front view showing the structure of the vicinity of the drive unit of the expansion joint according to the third embodiment. Fig. 9 yes Figure 8 A longitudinal sectional view of the vicinity of the drive unit shown. Fig.10 It is a perspective view showing the structure of a fixing member of an expander according to a fourth embodiment. DETAILED DESCRIPTION

[0008] The following describes an embodiment of the present disclosure using drawings. Note that various features shown in the following embodiments can be combined with each other.

[0009] In addition, the program for implementing the software appearing in this embodiment can be provided as a computer-readable non-transitory storage medium (Non-Transitory Computer-Readable Medium), can be provided in a downloadable manner from an external server, and can also be provided so that the program can be launched through an external computer to realize its functions on a client terminal (so-called cloud computing).

[0010] In addition, the "unit" in this embodiment may include, for example, a combination of hardware resources implemented by a generalized circuit and software information processing that can be specifically implemented by such hardware resources. In addition, although various information is processed in this embodiment, such information is a physical value representing a signal value of a voltage or current, or can be represented as a high or low signal value of a binary bit set composed of 0 or 1, or can be represented by quantum superposition (i.e., so-called quantum bit), and communication or operation can be performed on a generalized circuit.

[0011] In addition, a circuit in a broad sense is a circuit realized by at least appropriately combining circuits, circuit types, processors, and memories, etc. That is, it includes application-specific integrated circuits (ASICs), programmable logic devices (e.g., simple programmable logic devices (SPLDs), complex programmable logic devices (CPLDs), and field programmable gate arrays (FPGAs)).

[0012] <Wire tensioning device> First, the thread tensioning device of the present invention will be described. Figure 1 This is a front view showing a first embodiment of the thread tensioning device of the present invention. Figure 2 as well as Figure 3 are three-dimensional diagrams showing the structure of the supporting member in the figure. Figures 1 to 3 ( Figure 4 , Figure 5 as well as Figures 7 to 10 The same is true for ), the upper side is referred to as "upper" or "above", and the lower side is referred to as "lower" or "below". Figures 1 to 3 ( Figure 4 , Figure 5 as well as Figures 7 to 10 The same is true in the figure), the right side is referred to as the "right" or "right side", and the left side is referred to as the "left" or "left side". Figure 1 The wire tensioning device (also called a "strain rod") 100 shown is used, for example, to cut the covered wire 700 in an overhead state. Figure 1 In FIG. 1 , the covered electric wire 700 is indicated by a two-dot chain line.

[0013] The wire tensioning device 100 includes a pair of tensioners 10 for clamping a coated electric wire (wire) 700 , and a long retractor 1 having both ends connected to the tensioners 10 via connectors 500 and 510 . Furthermore, the dimension of the retractor 1 in the longitudinal direction is extended or contracted by driving the driving unit 4 provided on the right side (the other side) in the longitudinal direction of the retractor 1 .

[0014] <Tensioner> In the base portion 40 of the tensioner 10, the first connecting piece 50 and the second connecting piece 52 are pivotally supported at the lower side so as to be able to swing. The swing ends of the first connecting piece 50 and the second connecting piece 52 are both connected to the operating arm 60 to form a parallel connection mechanism. like Figure 1 As shown, the covered electric wire 700 is clamped from the upper and lower directions by the upper tension body 20 and the lower tension body 30. The upper tension body 20 is fixed to the base 40. On the other hand, the lower tension body 30 is connected to the upper part of the first connecting piece 50 and the second connecting piece 52 so as to be able to approach and separate from the upper tension body 20.

[0015] According to such a structure, when the operating arm 60 is pulled toward the retractor 1, the first connecting piece 50 and the second connecting piece 52 are shaken. Then, the lower take-up body 30 is displaced upward, that is, close to the upper take-up body 20, so that the covered electric wire 700 can be clamped. A support ring 80 protruding upward is provided on the base 40. The support ring 80 is an annular body constituting a hanging member locking body, and can be suspended by a remote control member to lift the tensioner 10. A tightening portion 82 protruding downward is provided on the lower tensioner 30. By rotating the tightening portion 82, the covered electric wire 700 can be tightened by the upper tensioner 20 and the lower tensioner 30.

[0016] <Support> Furthermore, the wire tensioning device 100 includes a pair of supports 400A and 400B attached to the retractor 1 . like Figure 2 and Figure 3 As shown, the support members 400A and 400B include a substantially C-shaped support member body 413 having an opening 410 on one side thereof, and a closing piece 414 for closing the opening 410 of the support member body 413. According to such a structure, after the covered electric wire 700 is introduced into the inner side of the support member body 413 through the opening 410, the opening 410 of the support member body 413 is closed by the closing piece 414, so that the retractor 1 can be supported on the covered electric wire 700.

[0017] Furthermore, an engaging piece 420 is rotatably provided at an end portion of the support body 413 facing the opening 410 , and the engaging piece 420 engages with the closing piece 414 in a state where the opening 410 is closed by the closing piece 414 . like Figure 2 As shown, in the support 400A, a through hole 416 through which the retractor 1 (moving shaft portion 3 ) is inserted is formed at the lower portion of the support body 413 . On the other hand, Figure 3As shown, in the support 400B, a through hole 418 through which the retractor 1 (main body tube portion 2) is inserted is formed in the lower portion of the support body 413.

[0018] In the support 400B, a fixing portion 430 for fixing the retractor 1 at a desired longitudinal position or rotation angle around a predetermined axis is provided at the lower portion of the support body 413. Furthermore, operation portions 432 and 434 for operating the fixing portion 430 by a remote operation unit are provided on both sides. According to the support 400B, it is possible to perform an operation (distribution operation) of changing the direction of the end portion of the right covered electric wire 700 after being cut so that the end portions of the covered electric wire 700 after being cut do not contact each other.

[0019] <Retractor> The tensioner 10 is connected to both ends of the expander 1. The expander 1 is a device used when the coated electric wire (wire material) 700 is expanded. <<First Embodiment>> First, a first embodiment of the retractor 1 will be described. Figure 4 This is a longitudinal section showing the structure of the vicinity of the operating portion and the driving portion in the expander according to the first embodiment. Figure 5 It is a perspective view (internal perspective view) schematically showing the structure of the operating portion of the expander according to the first embodiment.

[0020] like Figure 1 and Figure 4 As shown, the retractor 1 includes a main body tube portion 2 having a cylindrical shape and a small-diameter cylindrical movable shaft portion (inner tube portion) 3 provided so as to be relatively movable in the longitudinal direction of the main body tube portion 2 . The main body tube portion 2 is composed of a cylindrical portion (outer cylindrical portion) 21 made of, for example, aluminum or FRP (fiber reinforced plastic) and an operating portion 22 fixed to the axial right end portion (the other end portion) of the cylindrical portion 21 . The moving shaft portion 3 is inserted from the end portion (one end portion) on the left side in the axial direction into the cylindrical portion 21. Note that the moving shaft portion 3 is formed of, for example, FRP or the like.

[0021] The working part 22 has, for example, a housing 221 made of aluminum alloy, a threaded shaft 222 inserted through the cylindrical part 21 and the movable shaft part 3 , a nut 223 threadedly engaged with the threaded shaft 222 , and a pulley 224 mounted on the right end (the other end) of the threaded shaft 222 in the axial direction. The right end of the screw shaft 222 in the axial direction protrudes from the cylindrical portion 21 into the housing 221. The pulley 224 is fixed to the portion of the screw shaft 222 protruding from the cylindrical portion 21. Therefore, the pulley 224 is accommodated in the housing 221.

[0022] like Figure 5 As shown, the nut 223 has a hexagonal outer shape, and a connecting portion 2231 with a hexagonal outer shape is formed on the left side of the axial direction. The end portion (the other end portion) of the movable shaft portion 3 on the right side of the axial direction is inserted and fixed inside the connecting portion 2231. The nut 223 is preferably made of an iron-based metal material. In addition, the inner peripheral surface of the cylindrical portion 21 is formed into a hexagonal shape corresponding to the outer shape of the connecting portion 2231. Therefore, the nut 223 can be prevented from rotating with respect to the cylindrical portion 21 around the axial direction.

[0023] The housing 221 has a support portion 2211 protruding downward. The driving unit 4 is provided in the middle of the supporting portion 2211 in the longitudinal direction (vertical direction). The driving unit 4 includes a motor 41, and a motor body 411 of the motor 41 is fixed to the support portion 2211. The driving unit 4 includes a pulley 42 attached to a rotating shaft 412 of the motor 41, and a timing belt 43 wound around the pulley 42 and the pulley 224.

[0024] Therefore, in the present embodiment, the pulley 42 , the pulley 224 , and the timing belt 43 constitute a power transmission mechanism connected to the screw shaft 222 . The motor 41 (driving unit 4) is configured to rotate the threaded shaft 222 as the axis center via a power transmission mechanism. By rotating the threaded shaft 222 as the axis center, the nut 223 can reciprocate along the threaded shaft 222 while being guided by the inner circumferential surface of the cylindrical portion 21. In this way, the movable shaft portion 3 connected to the nut 223 is configured to freely appear and disappear relative to the cylindrical portion 21.

[0025] A sensor (position detection unit) 5 configured to detect the position of the nut 223 is provided on the outer peripheral side of the cylindrical portion 21. By detecting the position of the nut 223 by the sensor 5, the telescopic operation of the telescope 1 can be accurately performed. The sensor 5 may be composed of a magnetic sensor, an optical sensor, a contact sensor (limit sensor), etc. When the nut 223 is made of a metal material, the sensor 5 is preferably a magnetic sensor. In this case, the position of the nut 223 can be more easily and accurately detected.

[0026] Furthermore, a tension detection portion 6 configured to detect tension applied to the covered electric wire (wire material) 700 is provided at the right end portion (the other end portion) of the operating portion 22 (cylindrical portion 21 ) in the axial direction. In the present embodiment, the tension detection unit 6 is fixed to the housing 221 of the operating unit 22 (the right end portion of the main body tube 2 ) via the spacer 23 . The tension detection unit 6 includes a housing 61 , a stress applying member 62 having a T-shaped cross section, and a load cell (pressure sensor) 63 disposed between the housing 61 and the stress applying member 62 .

[0027] The stress applying member 62 is composed of a disk-shaped portion 621 and a rod-shaped portion 622 protruding axially to the right from the disk-shaped portion 621. The rod-shaped portion 622 is provided to penetrate the housing 61, and the fixing member 520 is fixed (connected) to the right end thereof in the axial direction. Figure 1 As shown, the fixing member 520 can lock the connecting member 500 and is configured to be connected to the tensioner 10 via the connecting member 500 . The load cell 63 is arranged to contact between the disk-shaped portion 621 and the housing 61. When the fixing member 520 is pulled, the stress applying member 62 fastened to the fixing member 520 is also pulled, and the load cell 63 is compressed (that is, stress is applied to the load cell 63) due to the disk-shaped portion 621. Thus, the tension applied to the covered electric wire 700 can be detected.

[0028] By providing the tension detection unit 6, it is possible to prevent in advance the application of tension more than necessary to the covered electric wire 700. Therefore, the wire tensioning operation can be performed safely. In particular, by implementing it in combination with the sensor 5, the above-mentioned effect can be further enhanced. From the same point of view, a sensor capable of measuring the current value flowing through the motor 41 may be provided. In this case, by measuring the current value, the torque when the motor 41 is driven can be grasped. Specifically, when the current value increases, the torque when the motor 41 is driven increases. Therefore, by measuring the current value flowing through the motor 41, it is possible to prevent the application of unnecessary tension to the covered electric wire 700 in advance.

[0029] In addition, when the expander 1 is extended and the nut 223 abuts against the left end (one end) of the cylindrical portion 21, or when the expander 1 is shortened and the nut 223 abuts against the working portion 22 (housing 221), the rotation of the motor 1700 stops, and the current value flowing through the motor 41 increases. Therefore, if the current value flowing through the motor 41 is measured, the position of the nut 223 can also be detected. Note that a fixing member 520 capable of locking the coupling 500 is also provided at the left end (one end) of the movable shaft portion 3. The fixing member 520 is also configured to be connected to the tensioner 10 via the coupling 500 as described above.

[0030] A power supply unit 7 is provided at the lower end portion of the support portion 2211 (the end portion on the opposite side of the working portion 22 via the drive portion 4). The power supply unit 7 includes a battery 71 and a battery mounting portion 72 on which the battery 71 can be detachably mounted. The battery mounting portion 72 is fixed to the support portion 2211. The power supply unit 7 supplies power to at least the sensor (position detection unit) 5. In the present embodiment, the power supply unit 7 can supply power to the sensor (position detection unit) 5, the motor 41, the load cell 63, and the like. Note that the battery 71 may be formed of, for example, a dry cell, a primary battery such as a solar cell, a secondary battery such as a lithium ion battery, or the like.

[0031] A control board 9 is mounted on a support member (not shown) below the tension detection unit 6. Note that a cover (not shown) for covering the control board 9 is preferably provided. Figure 6 This is a block diagram showing the configuration of a control substrate of the expander according to the first embodiment. The control board 9 controls at least the sensor (position detection unit) 5 . Figure 6 The control board 9 shown is a dedicated control device for, for example, the sensor (position detection unit) 5, the motor 41, the load cell 63, etc. electrically connected thereto. The control board 9 includes a communication unit 91, a storage unit 92, and a control unit 93, and these components are electrically connected via a communication bus 90.

[0032] The communication unit 91 is configured to be able to send various electrical signals from the control substrate 9 to the external components. In addition, the communication unit 91 is configured to be able to receive various electrical signals sent from the external components to the control substrate 9. It is further preferred that the communication unit 91 has a network communication function, thereby realizing various information communications with external devices via a network such as the Internet. The communication unit 91 preferably uses wired communication means such as USB (Universal Serial Bus), IEEE (Institute of Electrical and Electronics Engineers) 1394, Thunderbolt (registered trademark), wired LAN (Local Area Network) network communication, but may also include wireless LAN network communication, mobile communication such as 3G (Third Generation Mobile Communication) / LTE (Long Term Evolution) / 5G (Fifth Generation Mobile Communication), Bluetooth (registered trademark) communication, etc. as needed. That is, it is more preferably implemented by combining these multiple communication means.

[0033] The storage unit 92 stores various information defined in the above description. This can be implemented, for example, as a storage device such as a solid state drive (SSD) for storing various computer programs of the retractor 1 executed by the control unit 93, or as a memory such as a random access memory (RAM) for storing temporary necessary information (parameters, arrays, etc.) related to the operation of the computer program. The storage unit 92 stores various computer programs and variables related to the expansion and contraction device 1 executed by the control unit 93. In particular, it is preferable to store information related to a construction plan executed using the expansion and contraction device 1.

[0034] The control unit 93 performs processing and control of the overall operation related to the retractor 1 . The control unit 93 is, for example, a central processing unit (CPU, not shown). The control unit 93 implements various functions related to the retractor 1 by reading a predetermined computer program stored in the storage unit 92. That is, information processing is specifically implemented by the control unit 93 as an example of hardware via the software stored in the storage unit 92. Note that the control unit 93 is not limited to a single one, and a plurality of control units 93 may be provided for each function. Of course, a combination of these may also be used.

[0035] Next, a method of using the thread tensioning device 100 will be described. [1] First, the support members 400A and 400B are attached to the covered electric wire 700 using a remote control. [2] Then, a pair of tensioners 10 connected to both ends of the retractor 1 are mounted on the covered electric wire 700 using a remote control. Specifically, the remote control is hung on the support ring 80 to suspend the tensioner 10. Furthermore, the covered electric wire 700 is inserted between the upper tensioner 20 and the lower tensioner 30, and the upper tensioner 20 is hung on the covered electric wire 700.

[0036] [3] Next, by rotating the fastening portion 82 , the coated electric wire 700 is fastened by the upper fastening body 20 and the lower fastening body 30 . [4] Then, the motor 41 is operated using an external terminal (not shown) to rotate the rotating shaft 412 in a predetermined direction. As a result, the pulley 224 is also rotated via the pulley 42 fixed to the rotating shaft 412 and further via the timing belt 43 wound around the pulley 42. As a result, the threaded shaft 222 connected to the pulley 224 rotates, and the nut 223 screwed with the threaded shaft 222 moves to the right along the length direction of the threaded shaft 222.

[0037] At this time, the movable shaft portion 3 fixed to the nut 223 also moves to the right and is pulled into the cylindrical portion 21. That is, the retractor 1 contracts. Thus, the pair of tensioners 10 clamping the coated electric wire 700 can be brought closer. Thus, the covered electric wire 700 is in a stretched state outside the tensioner 10, and the portion of the covered electric wire 700 between the two tensioners 10 is loosened, and the loose portion of the covered electric wire 700 is cut off by the indirect live wire cutting tool. At this time, the external terminal is operated to stop the operation of the motor 41. Thereby, the contracted state of the retractor 1 can be maintained.

[0038] [5] After the operation is completed, the external terminal is operated to activate the motor 41 and rotate the rotating shaft 412 in the opposite direction to the above. This extends the longitudinal dimension of the retractor 1 and separates the tensioners 10 from each other. Then, the fastening portion 82 is rotated by using the remote control to loosen the fastening of the coated electric wire 700 by the upper and lower tensioning bodies 20 and 30 , thereby releasing the clamping of the coated electric wire 700 . Next, the pair of tensioners 10 connected to both ends of the retractor 1 are detached from the covered electric wire 700 using the remote control. Furthermore, the support members 400A and 400B are detached from the covered electric wire 700 using the remote control. In the manner described above, the wire tensioning device 100 can be recovered.

[0039] <<Second Embodiment>> Next, a second embodiment of the retractor 1 will be described. Hereinafter, the retractor 1 according to the second embodiment will be described, but the description will be mainly focused on the differences from the retractor 1 according to the first embodiment, and the description of the same matters will be omitted. Figure 7 It is a front view showing the structure of the main body tube portion side of the expandable joint according to the second embodiment. exist Figure 7 In the illustrated retractor 1 , three sensors 5 a , 5 b , and 5 c (position detection units) are arranged at predetermined intervals along the longitudinal direction of the cylindrical portion 21 .

[0040] By detecting the position of the nut 223 by the left sensor 5 a , it is possible to prevent the moving shaft portion 3 from protruding too much from the cylindrical portion 21 (main body cylindrical portion 2 ) and falling off. By detecting the position of the nut 223 by the central sensor 5 b , the initial position of the moving shaft portion 3 relative to the cylindrical portion 21 (main body cylindrical portion 2 ) can be defined (set). By detecting the position of the nut 223 by the right sensor 5c, it is possible to prevent the movable shaft portion 3 from retreating too much relative to the cylindrical portion 21 (main body cylindrical portion 2). In this way, it is possible to prevent the pulley 224 from being damaged or the like.

[0041] Note that any two of the three sensors 5a, 5b, and 5c may be provided, or one or more sensors may be additionally provided.

[0042] <<Third Embodiment>> Next, a third embodiment of the retractor 1 will be described. Hereinafter, the retractor 1 according to the third embodiment will be described, but the description will be mainly focused on the differences from the retractor 1 according to the first and second embodiments, and the description of the same matters will be omitted. Figure 8 It is a front view showing the structure of the vicinity of the drive unit of the expansion joint according to the third embodiment. Fig. 9 yes Figure 8 A longitudinal sectional view of the vicinity of the drive unit shown.

[0043] Figure 8 and Fig. 9 The driving unit 4 shown is configured to be manually operated. The driving unit 4 includes an operating unit 44 that protrudes from the lower surface of the housing 221 and is rotationally operated, and a power transmission mechanism 45 that is connected to the operating unit 44 and is accommodated in the housing 221 . The power transmission mechanism 45 includes a shaft portion 451 fixed to the operating portion 44 , a bevel gear 452 mounted on the upper end portion (the end portion opposite to the operating portion 44 ) of the shaft portion 451 , and a bevel gear 453 mounted on the right end portion (the other end portion) of the threaded shaft 222 and meshing with the bevel gear 452 . The rotation operation of the operating portion 44 is converted into a rotation operation of the threaded shaft 222 via the power transmission mechanism 45 .

[0044] When the telescope 1 is extended or retracted, the remote operating member (indirect tool) is engaged with the operating portion 44, and the operating portion 44 is rotated by the remote operating member. As a result, the threaded shaft 222 in the cylindrical portion 21 is driven to rotate via the power transmission mechanism 45, so that the movable shaft portion 3 screwed with the nut 223 at the end and the threaded shaft 222 is moved in the axial direction. In this way, the movable shaft portion 3 is retracted from the main body cylindrical portion 2, and the telescope 1 is configured to extend or retract. According to the retractor 1 of such a structure, since the electric power required for driving the motor is not required, the small power supply unit 7 and the control board 9 required for the operation of the sensors 5 , 5 a , 5 b , 5 c may be arranged, for example, on the upper side of 221 .

[0045] <<Fourth Embodiment>> Next, a fourth embodiment of the retractor 1 will be described. Hereinafter, the retractor 1 according to the fourth embodiment will be described, but the description will be mainly focused on the differences from the retractor 1 according to the first to third embodiments, and the description of the same matters will be omitted. Fig.10 It is a perspective view showing the structure of a fixing member of an expander according to a fourth embodiment.

[0046] Fig.10 The fixing member 530 shown is cylindrical and is joined to or integrally formed with the stress applying member 62 . The fixing member 530 has a groove 530a formed along the axial direction and a through hole 530b formed in a direction substantially orthogonal to the axial direction. In addition, the operating arm 60 of the tensioner 10 also has a through hole 60a formed in a direction substantially orthogonal to the axial direction at its left end (one end). The left end of the operating arm 60 is inserted into the groove 530a of the fixing member 530, and the through hole 530b is aligned with the through hole 60a. Then, a bolt (not shown) is inserted through the through hole 530b and the through hole 60a, and a nut (not shown) is screwed to the protruding end. Thus, the tensioner 10 is connected to the end of the retractor 1.

[0047] Depending on the type of the clamped wire, the type of the tensioner 10 can be selected. Then, according to the structure (shape) of the operating arm 60 of the selected tensioner 10, the retractor 1 having the fixing member 530 or the fixing member 520 with a shape (structure) suitable for connection is selected. Note that, when the tension detecting unit 6 is omitted, the fixing member 530 (the fixing member 520 is also the same) is provided at the right end portion (the other end portion) of the operating portion 22 in the axial direction.

[0048] As described above, according to the first, second and fourth embodiments, the extension and retraction operation of the retractor 1 is performed by the drive unit 4 having the motor 41. Therefore, since the retractor 1 itself assists the work requiring a large force, the operability is good. In addition, the situation that two operators were required to work on the aerial scaffolding in the past can now be realized by one operator, so the workability is also excellent. In addition, the remaining operator can understand the working status of the operator on the scaffolding on the ground and give correct instructions, so the safety is high.

[0049] In particular, in the present invention, the sensors 5, 5a, 5b, 5c are provided, so that the retractor 1 can be accurately extended and retracted. In addition, the tension detector 6 is provided, so that the covered electric wire 700 can be prevented from being excessively stretched, thereby preventing the covered electric wire 700 from being disconnected. Furthermore, the data (Data) obtained from these detection units during operation can be sent to an external terminal (such as a tablet terminal) via the communication unit 91 of the control board 9 and stored. In addition, based on the obtained data, it is possible to confirm the operation history and manage whether the retractor 1 needs repair, which is also preferred from the perspective of improving safety.

[0050] Note that the external terminal may be a foot switch, a voice recognition device, etc. In this case, even when working alone, the operator can operate the retractor 1 with both hands free. Furthermore, even if the wire tensioning devices 100 are used to simultaneously perform work on a plurality of covered electric wires (linear bodies) 700 , the wire tensioning work can be performed using one external terminal. In addition, in the present invention, any two or more structures in the first to fourth embodiments may be combined. Furthermore, the present invention can also be provided in the following various aspects.

[0051] (1) An expander used when stretching a wire, comprising: an outer cylinder, an inner cylinder, a working part, a driving part, and a position detecting part, wherein the inner cylinder is inserted into the outer cylinder from one axial end, the working part has a threaded shaft inserted through the outer cylinder and the inner cylinder, and a nut fixed to the other axial end of the inner cylinder and screwed with the threaded shaft, the driving part is configured to move the nut along the threaded shaft by rotating the threaded shaft about an axis, and the position detecting part is provided on the outer peripheral side of the outer cylinder and has at least one sensor for detecting the position of the nut.

[0052] (2) The expander according to the above (1), wherein the nut is made of a metal material, and the sensor is a magnetic sensor.

[0053] (3) The retractor according to (1) or (2) above, further comprising a tension detection unit for detecting tension applied to the wire.

[0054] (4) The retractor according to (3) above, further comprising a fixing member connected to a tensioner that clamps the wire, wherein the tension detection unit has a pressure sensor and a stress applying member, the stress applying member is connected to the fixing member and applies stress to the pressure sensor.

[0055] (5) The expander according to any one of (1) to (4) above, further comprising a power transmission mechanism connected to the threaded shaft, wherein the drive unit is configured to rotate the threaded shaft about an axis via the power transmission mechanism.

[0056] (6) The retractor according to any one of (1) to (5) above, further comprising a power supply unit that supplies electric power to at least the position detection unit.

[0057] (7) The retractor according to any one of (1) to (6) above, further comprising a control substrate for controlling at least the position detection unit.

[0058] (8) The retractor according to any one of (1) to (7) above, wherein the drive unit further includes a motor that rotates the threaded shaft about an axis.

[0059] (9) A wire tensioning device comprising: a pair of wire tensioners and an expander, wherein the expander is the expander according to any one of (1) to (8) above, and the pair of wire tensioners are respectively connected to ends of the expander. Of course, it's not limited to this.

[0060] Finally, although various embodiments of the present invention have been described, these are presented only as examples and are not intended to limit the scope of the invention. The new embodiments of the present invention may also be implemented in various other forms without departing from the gist of the present invention, and various omissions, substitutions, and modifications may be made. Such embodiments and their variations are included in the scope or spirit of the invention and are included in the invention described in the claims and their equivalents. Description of Reference Numerals

[0061] 1: telescopic device; 2: Main body cylinder; 21: Tubular part; 22: Work Department; 221: Shell; 2211: Supporting part; 222: threaded shaft; 223: Nut; 2231: Connecting part; 224: pulley; 23: spacer; 3: Moving shaft; 4: driving part; 41: Motor; 411: Motor body; 412: Rotation axis; 42: pulley; 43: Timing belt; 44: Operation unit; 45: power transmission mechanism; 451: shaft; 452: Bevel gear; 453: Bevel gear; 5: Sensor; 5a: sensor; 5b: sensor; 5c: sensor; 6: Tension detection unit; 61: Shell; 62: stress applying component; 621: disc-shaped part; 622: rod-shaped part; 63: load element; 7: Power supply; 71: Battery; 72: battery installation part; 9: Control substrate; 90: Communication bus; 91: Ministry of Communications; 92: storage unit; 93: Control Department; 10: Wire tensioner; 20: upper side tightening wire body; 30: lower side tightening body; 40: base portion; 50: first connecting piece; 52: second connecting piece; 60: operating arm; 60a: through hole; 80: support ring; 82: fastening portion; 100: wire tensioning device; 400A: Supporting parts; 400B: Supporting member; 410: opening; 413: Support body; 414: Close the slice; 416: through hole; 418: through hole; 420: joining piece; 430: fixed part; 432: Operation department; 434: Operation department; 500: Connecting parts; 510: Connecting piece; 520: fixed parts; 530: fixed parts; 530a: slot; 530b: through hole; 700: Covered wire.

Claims

1. An expander used when stretching a wire, comprising: The outer cylinder, the inner cylinder, the working part, the driving part and the position detection part, The inner tube portion is inserted into the outer tube portion from one end portion in the axial direction. The working portion includes a threaded shaft inserted through the outer tube portion and the inner tube portion, and a nut fixed to the other axial end portion of the inner tube portion and threadedly engaged with the threaded shaft. The driving unit is configured to move the nut along the threaded shaft by rotating the threaded shaft as an axis. The position detection unit is provided on the outer peripheral side of the outer tube portion and includes at least one sensor for detecting the position of the nut.

2. The retractor according to claim 1, wherein: The nut is made of metal material. The sensor is a magnetic sensor.

3. The retractor according to claim 1 or 2, wherein: The invention further includes a tension detection unit for detecting tension applied to the wire.

4. The retractor according to claim 3, wherein: It also has a fixing member connected to a tensioner that clamps the wire, The tension detection unit includes a pressure sensor and a stress applying member connected to the fixing member and applying stress to the pressure sensor.

5. The retractor according to any one of claims 1 to 4, wherein: It also includes a power transmission mechanism connected to the threaded shaft, The driving unit is configured to rotate the screw shaft about an axis through the power transmission mechanism.

6. The retractor according to any one of claims 1 to 5, wherein: A power supply unit is further provided for supplying electric power to at least the position detection unit.

7. The retractor according to any one of claims 1 to 6, wherein: A control substrate for controlling at least the position detection unit is further provided.

8. The retractor according to any one of claims 1 to 7, wherein: The driving unit further includes a motor that rotates the threaded shaft about an axis.

9. A wire tensioning device, comprising: A pair of tensioners and retractors, The retractor is constituted by the retractor according to any one of claims 1 to 8, and the pair of tensioners are respectively connected to ends of the retractor.

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