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 is provided with an expansion piece main body and a power part. The expansion piece main body comprises an outer cylinder part, an inner cylinder part which is inserted into the outer cylinder part from one axial end part, an operating part which is provided with a threaded shaft which is inserted into the outer cylinder part and the inner cylinder part, and a nut which is fixed on the other axial end part of the inner cylinder part and is screwed with the threaded shaft; and an operation part for moving the nut along the threaded shaft. The power unit is detachably attached to the retractor body, and includes an engaging portion that engages with the operation unit, and a motor that rotates the engaging portion.

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 turning operation of the bolt requires a great deal of force. In view of the above circumstances, the present invention provides a retractor and a wire tensioning device that can perform wire tensioning operations 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 includes a retractor body and a power unit. The retractor body includes an outer cylinder, an inner cylinder inserted into the outer cylinder from one axial end, a working portion having 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, and an operating portion that moves the nut along the threaded shaft by rotating the threaded shaft about the axis. The power unit is mounted on the retractor body in a removable manner. The power unit includes a coupling portion coupled to the operating portion, and a motor that rotates the coupling portion.

[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 of the expander according to the first embodiment. Figure 5It 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 It is a perspective view showing a state where the power unit is mounted on the expander body in the expander according to the first embodiment. Figure 7 It is a perspective view showing a state in which the power unit is detached from the expander body in the expander according to the first embodiment. Figure 8 yes Figure 7 AA cross-section diagram in. Fig. 9 ( Fig. 9 (a) to Fig. 9 (c)) is a partial cross-sectional view for explaining the procedure of attaching the power unit to the expander body in the expander of the first embodiment. Fig.10 It is a block diagram showing the structure of a control substrate in the expander according to the first embodiment. Fig.11 It is a longitudinal sectional view showing the structure of the vicinity of the fixing member in the expansion joint according to the second embodiment. Fig.12 It is a perspective view showing the structure of a fixing member in the expander according to the third 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 ( Figures 4 to 6 , Fig.11 and Fig.12 Similarly, in the above description, 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 ( Figures 4 to 6 , Fig.11 and Fig.12 Similarly, in the figure, the right side is referred to as the “right” or “right direction”, and the left side is referred to as the “left” or “left direction”. 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 by 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 40 of the tensioner 10, a first link piece 50 and a second link piece 52 are axially supported at the bottom so as to be able to swing. The swing ends of the first link piece 50 and the second link 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 retractor body 11. The retractor body 11 includes a main body tube portion 2 having a cylindrical shape and a small-diameter cylindrical moving shaft portion (inner tube portion) 3 provided 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 (the other end) 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 operating portion 22 includes a housing 221 made of, for example, an aluminum alloy, a threaded shaft 222 inserted through the cylindrical portion 21 and the movable shaft portion 3 , and a nut 223 threadably engaged with the threaded shaft 222 . The right end portion of the threaded shaft 222 in the axial direction protrudes from the cylindrical portion 21 into the housing 221 . like Figure 5As shown, the nut 223 has a hexagonal outer shape, and a connecting portion 2231 is formed on the left side of the axial direction and protrudes. 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.

[0022] like Figure 4 As shown, the driving unit 4 includes an operating unit 44 that protrudes from the bottom surface of the housing 221 and is rotated, and a power transmission mechanism 45 that is connected to the operating unit 44 and the threaded shaft 222 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 operation part 44 is configured to operate the power transmission mechanism 45 to rotate the threaded shaft 222 as the axis center. 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 peripheral surface of the cylindrical part 21. In this way, the movable shaft part 3 connected to the nut 223 is protruded and retracted relative to the cylindrical part 21, and the telescopic device body 11 is extended or contracted.

[0023] 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 retractor body 11 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.

[0024] In addition, a fixing member 520 is provided at the right end (the other end) of the working portion 22 (cylindrical portion 21) in the axial direction so as to be rotatable around the axis center of the screw shaft 222. Figure 1 As shown, the connecting member 500 can be locked on the fixing member 520, and is configured to be connected to the tensioner 10 through the connecting member 500. Note that a fixing member 520 capable of locking the connecting member 500 is also provided at the left end (one end) of the movable shaft portion 3. Similar to the above, the fixing member 520 is also configured to be connected to the tensioner 10 through the connecting member 500. like Figure 4As shown in FIG. 1 , a disc-shaped flange portion 46 is fixed to the end of the housing 221 on the operating portion 44 side. In addition, a plurality of (four in this embodiment) pins 47 (see the following description) protruding downward (on the operating portion 44 side) are provided below the flange portion 46. Figure 7 ).

[0025] A power unit (power unit) 1000 is detachably mounted on the operating portion 44 and the vicinity of the above-mentioned telescopic body 11. That is, the telescopic body 1 includes the power unit 1000. Here, the operating portion 44 protrudes from the telescopic body 11 in a direction substantially orthogonal to the axial direction of the threaded shaft 222. Therefore, the power unit 1000 can be relatively easily mounted and removed from the telescopic body 11. Figure 6 It is a perspective view showing a state where the power unit is mounted on the expander body in the expander according to the first embodiment. Figure 7 It is a perspective view showing a state in which the power unit is detached from the expander body in the expander according to the first embodiment. Figure 8 yes Figure 7 AA cross-section diagram in. Fig. 9 is a partial cross-sectional view for explaining the steps of installing the power unit to the expander body in the expander of the first embodiment. Figures 8 to 9 In the text, the upper side is referred to as “upper” or “above”, and the lower side is referred to as “lower” or “below”.

[0026] Figure 6 The power unit 1000 shown has a housing 1100 , a mounting portion 1200 , a fixing mechanism 1300 , a grip portion 1400 , and a cover 1500 . The housing 1100 is formed of a rectangular parallelepiped member. The motor 1700 is accommodated in the housing 1100 , and the motor body 1710 is fixed to the housing 1100 . The mounting portion 1200 is connected to the housing 1100. The mounting portion 1200 is a portion mounted on the telescopic body 11 and is formed of a cylindrical member. The mounting portion 1200 accommodates the operating portion 44 when the power unit 1000 is mounted on the telescopic body 11. The mounting portion 1200 accommodates a joint portion 1600 that is engaged with the operating portion 44.

[0027] like Figure 8 As shown, the joint portion 1600 has a groove 1610 opened upward and a connecting shaft 1620 protruding downward. By inserting the operation part 44 into the groove 1610, the engagement part 1600 is engaged with the operation part 44. On the other hand, the connection shaft 1620 is connected to the rotation shaft 1720 of the motor 1700 through the connection part 1800. Thus, the motor 1700 can rotate the engagement part 1600. According to such a structure, the rotational force of the motor 1700 can be transmitted to the operation portion 44 engaged with the engagement portion 1600, and further transmitted to the threaded shaft 222 through the power transmission mechanism 45. In this way, the retractor body 11 is extended or contracted as described above.

[0028] A ring portion 1210 is formed on the inner peripheral surface of the mounting portion 1200 so as to protrude radially inward along the circumferential direction thereof and to contact the flange portion 46 . In addition, a plurality of through holes 1211 penetrating in the thickness direction of the ring portion 1210 are formed. In the present embodiment, the number of through holes 1211 provided corresponds to the number of pins 47 provided, which is four. When the power unit 1000 is mounted on the telescope body 11, the pins 47 are inserted into the through holes 1211. Thus, the power unit 1000 can be prevented from rotating relative to the telescope body 11. That is, in the present embodiment, the pins 47 and the through holes 1211 constitute a rotation prevention mechanism for the power unit 1000 relative to the telescope body 11. Note that the number of pins 47 and through holes 1211 is not limited to four, and can be one or more, preferably two or more. In addition, the number of pins 47 can be the same as the number of through holes 1211, or can be less than the number of through holes 1211. That is, the number of pins 47 and the number of through holes 1211 can be the same or different.

[0029] The fixing mechanism 1300 is a mechanism for fixing the housing 1100 to the telescope body 11 in a state where the power unit 1000 is mounted on the telescope body 11. The fixing mechanism 1300 is provided as a pair on the outer peripheral side of the mounting portion 1200. Each fixing mechanism 1300 includes a rod 1310 locked to the flange portion 46, a slider 1320 for performing a displacement operation of the rod 1310, a coil spring 1330 for urging the rod 1310, and a guide member 1340 for guiding the movement of the slider 1320. The lever 1310 has a claw 1311 provided at an upper end portion and in contact with the flange portion 46 , a spring seat 1312 of a coil spring 1330 provided at a lower end portion, and a shaft 1313 serving as a rotation center.

[0030] The slider 1320 has a pressing portion 1321 provided at the upper end portion and contacting and pressing the spring seat 1312 from the outer peripheral side, and an operating ring 1322 provided at the lower end portion and performing an operation of sliding (moving) the slider 1320 in the vertical direction. Note that the opposing surfaces of the spring seat 1312 and the pressing portion 1321 are respectively formed of inclined surfaces.

[0031] When the pressing portion 1321 moves downward, the pressing portion 1321 presses the spring seat 1312 toward the radial inner side of the mounting portion 1200 along the inclined surface to displace it. As a result, the claw 1311 rotates (displaces) toward the radial outer side of the mounting portion 1200 (refer to Fig. 9 (a) and Fig. 9 (b) At this time, the coil spring 1330 is compressed against the applied force and becomes a compressed state. When the pressing portion 1321 moves upward from this state, the coil spring 1330 presses the spring seat 1312 radially outwardly of the mounting portion 1200 by its urging force, thereby displacing it. As a result, the claw 1311 rotates (displaces) radially inwardly of the mounting portion 1200 (see Figure 8 and Fig. 9 (c)).

[0032] The gripping portion 1400 is provided at the lower end of the housing 1100. The gripping portion 1400 is a portion gripped by a remote operating member (indirect tool). By gripping the gripping portion 1400 with the remote operating member, the power unit 1000 can be lifted, mounted on the telescopic device body 11, or detached from the telescopic device body 11. The cover 1500 is water-resistant and seals the power supply unit 7 and the control substrate 9 in a liquid-tight manner. Note that when the power unit 1000 is mounted on the retractor body 11, the power supply unit 7 and the control substrate 9 are connected to the electronic components on the retractor body 11 side such as the sensor 5 and the load cell 63 described later via electrical wiring (not shown).

[0033] Although not shown, the power supply unit 7 includes a battery and a battery mounting portion for detachably mounting the battery. The power supply unit 7 supplies power to at least the motor 1700. In this embodiment, the power supply unit 7 can supply power to the sensor (position detection unit) 5, the motor 1700, and the like. Note that the battery may be, for example, a primary battery such as a dry cell or a solar cell, or a secondary battery such as a lithium ion battery. Fig.10 It is a block diagram showing the structure of a control substrate in the expander according to the first embodiment. The control board 9 controls at least the motor 1700 . Fig.10 The control board 9 shown is a dedicated control device for, for example, the sensor (position detection unit) 5 and the motor 1700 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 .

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] [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] Next, the gripping portion 1400 is gripped by the remote control and the power unit 1000 is lifted. At this time, the slider 1320 is positioned downward and the claw 1311 of the rod 1310 is displaced radially outward of the mounting portion 1200. Then, in this state, the mounting portion 1200 is brought close to the operating portion 44 (see FIG. 4 ) of the telescopic body 11. Fig. 9 (a)).

[0039] When the mounting portion 1200 is brought closer to the operating portion 44 of the retractor body 11, the outer peripheral side of the operating portion 44 is covered by the mounting portion 1200 and is inserted into the groove 1610 (see FIG. 16A ) of the coupling portion 1600. Fig. 9 (b) In this state, the engagement portion 1600 is engaged with the operation portion 44. In addition, at this time, by inserting the pin 47 into the corresponding through hole 1211, the power unit 1000 can be prevented from rotating relative to the retractor body 11. And, when the slider 1320 is slid upward, as described above, the claw 1311 of the rod 1310 is displaced radially inward of the mounting portion 1200. In this state, the claw 1311 of the rod 1310 is locked on the upper side of the edge portion of the flange portion 46 (refer to Fig. 9 (c)). Thus, the power unit 1000 is fixed to the telescopic device body. That is, the power unit 1000 is prevented from being separated from the telescopic device body.

[0040] [5] Then, the motor 1700 is operated using an external terminal (not shown) to rotate the rotating shaft 1720 in a predetermined direction. As a result, the operating portion 44 engaged with the engaging portion 1600 also rotates in the same direction. In this way, the threaded shaft 222 connected to the power transmission mechanism 45 rotates about the axis, and the nut 223 screwed with the threaded shaft 222 moves to the right along the length direction of the threaded shaft 222. 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 body 11 contracts. Thus, the pair of tensioners 10 clamping the coated electric wire 700 can be brought closer.

[0041] 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 1700. Thus, the retracted state of the retractor body 11 can be maintained. Note that the power unit 1000 may also be installed on the retractor body 11 before the above steps [1] to [3].

[0042] [6] After the operation is completed, the external terminal is operated to activate the motor 1700 and rotate the rotating shaft 1720 in the opposite direction to the above. This extends the longitudinal dimension of the retractor body 11 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 body 11 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.

[0043] <<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. Fig.11 It is a longitudinal sectional view showing the structure of the vicinity of the fixing member in the expansion joint according to the second embodiment.

[0044] exist Fig.11In the illustrated retractor 1 , a tension detector 6 is provided at the axial right end (the other end) of the operating portion 22 (cylindrical portion 21 ) and is configured to detect tension applied to the coated electric wire (wire material) 700 . 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 .

[0045] The stress applying member 62 is composed of a disk-shaped portion 621 and a rod-shaped portion 622 protruding axially rightward from the disk-shaped portion 621. The rod-shaped portion 622 penetrates the housing 61, and the fixing member 520 is fixed (connected) to the right end in the axial direction. The load cell 63 is arranged to be in 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.

[0046] According to the retractor 1 of the second embodiment, the same operations and effects as those of the retractor 1 of the first embodiment can be obtained. In particular, by providing the tension detection unit 6, it is possible to prevent in advance the application of a tension greater than necessary to the multiplexed electric wire 700. Therefore, the wire tensioning operation can be performed safely. In particular, by combining it with the sensor 5, the above-mentioned effect can be further enhanced.

[0047] From the same point of view, a sensor capable of measuring the current value flowing through the motor 1700 may be provided. In this case, by measuring the current value, the torque (Torque) when the motor 1700 is driven can be grasped. Specifically, when the current value becomes larger, the torque when the motor 1700 is driven becomes larger. Therefore, if the current value flowing through the motor 1700 is measured, it is possible to prevent the application of unnecessary tension to the covered electric wire 700 in advance. In addition, when the expander body 11 is extended and the nut 223 abuts against the left end (one end) of the cylindrical portion 21, or when the expander body 11 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 1700 increases. Therefore, if the current value flowing through the motor 1700 is measured, the position of the nut 223 can also be detected.

[0048] <<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. Fig.12 It is a perspective view showing the structure of a fixing member in the expander according to the third embodiment.

[0049] Fig.12 The fixing member 530 shown has a cylindrical shape, and is provided at the right end portion (the other end portion) of the operating portion 22 in the axial direction, or 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 body 11.

[0050] According to the retractor 1 of the third embodiment, it is also possible to obtain the same operation and effects as those of the retractor 1 of the first and second embodiments. 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.

[0051] As described above, according to the first to third embodiments, the telescopic operation of the telescopic device body 11 is performed by the power unit 1000 having the motor 1700. Therefore, since the telescopic device 1 itself assists the work requiring a large force, the operability is good. In particular, the power unit 1000 is detachably mounted on the expander body 11. Therefore, the power unit 1000 having the motor 1700 with a different torque can be easily replaced according to the force required for the rotation of the threaded shaft 222. Note that a power supply and a control substrate for the sensor 5 may be separately assembled to the retractor body 11 .

[0052] In addition, the expander body 11 may be used directly as the expander 1 without installing the power unit 1000. In this case, the remote operation tool is engaged with the operation part 44, and the operation part 44 is rotated by the remote operation tool. In addition, if the power unit 1000 is used, the situation where two operators are required to work on the aerial scaffolding can 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.

[0053] In particular, by providing the sensor 5, the retractor body 11 can be accurately retracted and retracted. In addition, by providing the tension detector 6, the covered electric wire 700 can be prevented from being excessively stretched, and the covered electric wire 700 can be prevented from being disconnected. In this case, the data (Data) obtained from these detection units during operation can be sent to an external terminal (such as a tablet terminal) and stored through the communication unit 91 of the control board 9. 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 preferable from the perspective of improving safety.

[0054] Note that the external terminal may be a foot switch, a voice recognition device, etc. In this case, even when working alone, both hands can be freed when operating the retractor body 11. 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 third embodiments may be combined.

[0055] A plurality of sensors 5 may be provided along the axial direction of the cylindrical portion 21 . In this case, by detecting the position of the nut 223 using one sensor 5 , 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. In addition, by detecting the position of the nut 223 by another sensor 5 , it is possible to define (set) the initial position of the moving shaft portion 3 relative to the cylindrical portion 21 (main body cylindrical portion 2 ). Furthermore, by detecting the position of the nut 223 by another sensor 5, 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). Furthermore, the present invention can also be provided in the following various aspects.

[0056] (1) A retractor for use in stretching a wire, comprising: a retractor body and a power unit; the retractor body includes an outer tube, an inner tube inserted into the outer tube from one axial end, a working portion having a threaded shaft inserted through the outer tube and the inner tube, and a nut fixed to the other axial end of the inner tube and threadedly engaged with the threaded shaft, and an operating portion for moving the nut along the threaded shaft by rotating the threaded shaft about an axis; the power unit is detachably mounted on the retractor body, and includes a coupling portion coupled to the operating portion, and a motor for rotating the coupling portion.

[0057] (2) The retractor according to (1) above, wherein the operating portion protrudes from the retractor body in a direction substantially orthogonal to an axial direction of the threaded shaft.

[0058] (3) The retractor according to (1) or (2) above, wherein the power unit further includes a housing for housing the motor, a mounting portion connected to the housing and housing the joint, and a fixing mechanism for fixing the housing to the retractor body.

[0059] (4) The retractor according to any one of (1) to (3) above, further comprising a mechanism for preventing the power unit from rotating relative to the retractor body.

[0060] (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 operating portion is configured to operate the power transmission mechanism to rotate the threaded shaft about an axis.

[0061] (6) The retractor according to any one of (1) to (5) above, further comprising a power supply unit for supplying electric power to at least the motor.

[0062] (7) The retractor according to any one of (1) to (6) above, further comprising a control unit that controls at least the motor.

[0063] (8) A wire tensioning device comprising: a pair of wire tensioners and an expander, wherein the expander is constituted by the expander according to any one of (1) to (7) above, and the pair of wire tensioners are respectively connected to ends of the expander. Of course, it's not limited to this.

[0064] 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

[0065] 1: telescopic device; 11: telescopic device body; 2: Main body cylinder; 21: Tubular part; 22: Work Department; 221: Shell; 222: threaded shaft; 223: Nut; 2231: Connecting part; 23: spacer; 3: Moving shaft; 4: driving part; 44: Operation unit; 45: power transmission mechanism; 451: shaft; 452: Bevel gear; 453: Bevel gear; 46: flange portion; 47: Pin; 5: 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; 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; 1000: Power unit; 1100: housing; 1200: Installation department; 1210: Ring; 1211: through hole; 1300: fixing mechanism; 1310: rod; 1311: Claw; 1312: Spring seat; 1313: axis; 1320: Slider; 1321: pressing part; 1322: Operation ring; 1330: Coil spring; 1340: guide component; 1400: gripping part; 1500: Cover; 1600: Joint; 1610: slot; 1620: Connecting shaft; 1700: Motor; 1710: Motor body; 1720: Rotation axis; 1800: Connection part.

Claims

1. A retractor for stretching a wire, comprising: The main body and the power part of the telescope; The retractor body comprises Outer tube, Insert the inner tube portion of the outer tube portion from one axial end portion, A working portion having a threaded shaft inserted through the outer tube portion and the inner tube portion, and a nut fixed to the other axial end of the inner tube portion and threadedly engaged with the threaded shaft. and an operating portion for moving the nut along the threaded shaft by rotating the threaded shaft as an axis; The power unit is detachably mounted on the retractor body and includes a joint portion that is joined to the operating portion and a motor that rotates the joint portion. 2 . The retractor according to claim 1 , wherein the operating portion protrudes from the retractor body in a direction substantially orthogonal to an axial direction of the threaded shaft.

3. The retractor according to claim 1 or 2, wherein the power unit further comprises a housing for accommodating the motor, a mounting portion connected to the housing and accommodating the joint, and a fixing mechanism for fixing the housing to the retractor body. 4 . The retractor according to claim 1 , further comprising a mechanism for preventing the power unit from rotating relative to the retractor body.

5. The expander according to any one of claims 1 to 4, further comprising a power transmission mechanism connected to the threaded shaft. The operation portion is configured to operate the power transmission mechanism to rotate the threaded shaft about an axis. 6 . The retractor according to claim 1 , further comprising a power supply unit for supplying electric power to at least the motor. 7 . The retractor according to claim 1 , further comprising a control unit for controlling at least the motor.

8. 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 7, and the pair of tensioners are respectively connected to ends of the retractor.

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