Tension device

Abstract

[Problem] To provide a tension device capable of adjusting, using a simple operation, the degree of rotational force transmitted to a winding part of a linear body. [Solution] One embodiment of the present invention provides a tension device. The tension device comprises a body section, a drive mechanism, a traction mechanism, a transmission mechanism, an adjustment mechanism, a first attachment part, and a second attachment part. The traction mechanism has an elongated body and a winding part for winding the elongated body. The drive mechanism has a motor. The transmission mechanism has a plurality of pulleys and a belt wound around the plurality of pulleys, and is configured to wind the elongated body by transmitting the rotational force of the motor to the winding part of the traction mechanism. The adjustment mechanism is configured to be capable of adjusting the tension applied to the belt. The first attachment part is held in partway along the longitudinal direction of the elongated body. The second attachment part is attached to the body section.

Description

tensioning device

[0001] The present invention relates to a wire tensioning device.

[0002] The overhead wires are tensioned, for example, using a wire tensioning device (see Patent Document 1). This wire tensioning device includes a rotary drive mechanism that winds the traction unit into the wire tensioner main body, a drive source having an electric motor that applies a driving force to the rotary drive mechanism, and a brake mechanism engaged with the rotary drive mechanism. The rotary drive mechanism is rotated mainly by the driving force of the electric motor of the drive source.

[0003] JP 2013-255398 A

[0004] However, conventional wire tensioning devices do not have a mechanism for adjusting the degree of rotational force transmitted to the load sheave (winding section) that winds the chain (linear body). Therefore, if this deviates from the set value, the wire tensioning device must be disassembled and repaired to adjust it. In view of the above circumstances, the present invention provides a wire tensioning device that can adjust the degree of rotational force transmitted to the winding section of the linear body with a simple operation.

[0005] According to one aspect of the present invention, there is provided a wire tensioning device. The wire tensioning device includes a main body, a drive mechanism, a traction mechanism, a transmission mechanism, an adjustment mechanism, a first mounting portion, and a second mounting portion. The traction mechanism has a long body and a winding portion that winds up the long body. The drive mechanism has a motor. The transmission mechanism has a plurality of pulleys and a belt wound around the plurality of pulleys, and is configured to transmit the rotational force of the motor to the winding portion of the traction mechanism to wind up the long body. The adjustment mechanism is configured to be able to adjust the tension applied to the belt. The first mounting portion is held midway along the longitudinal direction of the long body. The second mounting portion is attached to the main body.

[0006] According to this aspect, the degree of rotational force transmitted to the winding portion of the linear body can be adjusted with a simple operation.

[0007] FIG. 1 is a front view showing an embodiment of a wire tensioning device in use. FIG. 2 is a perspective view of the wire tensioning device of this embodiment. FIG. 3 is an exploded perspective view showing a portion of the configuration of each mechanism of the wire tensioning device of this embodiment. FIG. 4 is an exploded perspective view showing a portion of the configuration of a transmission mechanism of the wire tensioning device of this embodiment. FIG. 5(a) is a front view of the wire tensioning device of this embodiment, and FIG. 5(b) is a rear view of the wire tensioning device of this embodiment. FIG. 6(a) is a right side view of the wire tensioning device of this embodiment, and FIG. 6(b) is a left side view of the wire tensioning device of this embodiment. FIG. 7(a) is a plan view of the wire tensioning device of this embodiment, and FIG. 7(b) is a bottom view of the wire tensioning device of this embodiment. FIG. 8 is a perspective view showing a portion of the configuration of each mechanism of the wire tensioning device of this embodiment. FIG. 9 is a diagram showing the relationship between the first gear and the second gear. FIG. 10 is a diagram showing the relationship between the ratchet gear and the ratchet pawl. FIG. 11 is a cross-sectional view taken along line A-A in FIG. 7(a) (rotated 90 degrees to the right). Fig. 12(a) is a front view showing the fall-off prevention piece in a position where a tool can be attached, and Fig. 12(b) is a front view showing the fall-off prevention piece in a position where the tool will not fall off. Fig. 13 is a block diagram showing the configuration of the control board.

[0008] Hereinafter, embodiments of the wire tensioning device will be described with reference to the drawings. Various features shown in the following embodiments can be combined with each other.

[0009] Incidentally, the program for realizing the software appearing in this embodiment may be provided as a non-transitory computer-readable recording medium, or may be provided so as to be downloadable from an external server, or may be provided so that the program is started on an external computer and its functions are realized on a client terminal (so-called cloud computing).

[0010] In this embodiment, the term "unit" may also include, for example, a combination of hardware resources implemented by a circuit in the broad sense and software information processing that can be specifically realized by these hardware resources. In addition, this embodiment handles various types of information, which may be represented by, for example, physical values ​​of signal values ​​representing voltages and currents, high and low signal values ​​as a binary bit set consisting of 0 or 1, or quantum superposition (so-called quantum bits), and communication and calculations may be performed on a circuit in the broad sense.

[0011] Furthermore, a circuit in the broad sense is a circuit realized by at least an appropriate combination of a circuit, circuitry, a processor, a memory, etc. In other words, it includes an application specific integrated circuit (ASIC), a programmable logic device (e.g., a simple programmable logic device (SPLD), a complex programmable logic device (CPLD), and a field programmable gate array (FPGA)), etc.

[0012] FIG. 1 is a front view showing an embodiment of a wire tensioning device in use. FIG. 2 is a perspective view of the wire tensioning device of this embodiment. FIG. 3 is an exploded perspective view showing a partial configuration of each mechanism of the wire tensioning device of this embodiment. FIG. 4 is an exploded perspective view showing a partial configuration of a transmission mechanism of the wire tensioning device of this embodiment. FIG. 5(a) is a front view of the wire tensioning device of this embodiment, and FIG. 5(b) is a rear view of the wire tensioning device of this embodiment. FIG. 6(a) is a right side view of the wire tensioning device of this embodiment, and FIG. 6(b) is a left side view of the wire tensioning device of this embodiment. FIG. 7(a) is a plan view of the wire tensioning device of this embodiment, and FIG. 7(b) is a bottom view of the wire tensioning device of this embodiment.

[0013] FIG. 8 is a perspective view showing the configuration of some of the mechanisms of the wire tensioning device of this embodiment. FIG. 9 is a diagram showing the relationship between the first gear and the second gear. FIG. 10 is a diagram showing the relationship between the ratchet gear and the ratchet pawl. FIG. 11 is a cross-sectional view taken along line A-A in FIG. 7(a) (rotated 90° to the right). FIG. 12(a) is a front view showing the anti-fall-off piece in a position where a tool can be attached, and FIG. 12(b) is a front view showing the anti-fall-off piece in a position where the tool will not fall off. FIG. 13 is a block diagram showing the configuration of the control board. Note that the belt wound around the pulley is omitted from FIGS. 3, 4, 5(a), 6(a), 6(b), 7(a), 7(b), 8, and 11. Also, a portion of the first mounting portion is omitted from FIGS. 2, 5(a), 5(b), 6(a), 7(a), and 7(b).

[0014] The wire tensioning device 1 shown in Fig. 1 can be used, for example, in wire tensioning work, by pulling and holding the free end 960a of an overhead wire 960 toward a utility pole C. The wire tensioning device 1 is configured to tension the overhead wire 960 in a direction perpendicular to or intersecting the utility pole C suspended above the ground, i.e., in a direction parallel or horizontal to the ground (so-called "horizontal suspension"). The wire tensioning device 1 includes a main body 2, a drive mechanism 3, a traction mechanism 6, a transmission mechanism 4, an adjustment mechanism 7, a first mounting portion 5, a second mounting portion 8, a third mounting portion 11, a control board 9, and a power supply 10.

[0015] The main body 2 is constructed by connecting plate-shaped members, rod-shaped members, strip-shaped members, cover members, etc. with connecting members such as screws and bolts. Examples of materials that can be used to construct the main body 2 include metal materials such as aluminum and aluminum alloys, and plastic materials such as FRP (fiber reinforced plastic). The main body 2 houses the drive mechanism 3, part of the transmission mechanism 4, part of the traction mechanism 6, a control board 9, and a power supply unit 10. As shown in Figures 3, 6(b), and 8, the drive mechanism 3 has a motor 31.

[0016] As shown in FIGS. 8 and 9 , the traction mechanism 6 includes a chain (long body) 61 and a load sheave (winding portion) 62 that winds up the chain 61. As shown in FIGS. 2 , 5( a ), and 5 ( b ), the fixed side portion 61 a of the chain 61 is fixed to the fixed portion 21 provided outside the main body portion 2. The chain 61 is wound around (wound) the base portion (movable pulley) 520 of the first mounting portion 5 and then folded back. That is, the first mounting portion 5 is held midway along the length of the chain 61. The chain 61 enters the main body portion 2 through the chain inlet / outlet 22, winds around (wound) the load sheave 62, and then its winding side portion 61 b ​​is pulled out of the main body portion 2 through the chain inlet / outlet 23. The end of the winding side portion 61 b ​​pulled out of the main body portion 2 through the chain inlet / outlet 23 forms the third mounting portion 11. On the other hand, the second mounting portion 8 is attached to the main body portion 2 .

[0017] The rotational force of the motor 31 of the drive mechanism 3 is transmitted to the load sheave 62 of the traction mechanism 6 via the transmission mechanism 4, thereby winding up the chain 61. As shown in Figures 2 and 3, the transmission mechanism 4 has a plurality of pulleys (in this embodiment, three pulleys: a first pulley 41, a second pulley 42, and a third pulley 43) and a belt 44 wound around the plurality of pulleys. The belt is not particularly limited, but a V-belt, for example, can be used.

[0018] As shown in FIG. 3 , the first pulley 41 is connected to the rotating shaft 32 of the motor 31. The second pulley 42 is rotatably supported by the main body 2. Specifically, as shown in FIG. 11 , the rotating shaft 45 is rotatably supported by the main body 2. The second pulley 42 is inserted into a portion of the rotating shaft 45 that is outside the main body 2. As a result, the end of the rotating shaft 45 protrudes from the second pulley 42. A cover 46 is attached to the portion of the rotating shaft 45 that protrudes from the second pulley 42. The cover 46 is fixed to the second pulley 42 by a screw 461 inserted into a through hole 46 a. In this way, the second pulley 42 is rotatable together with the rotating shaft 45 relative to the main body 2. The third pulley 43 is provided so as to be displaceable relative to the main body 2.

[0019] As shown in FIGS. 3 , 8 , and 9 , the transmission mechanism 4 further includes a first gear 47 disposed concentrically with the second pulley 42. The first gear 47 is formed integrally with the rotary shaft 45 (constitutes an integral part with the rotary shaft 45) around its axis, and can rotate integrally with the second pulley 42. The transmission mechanism 4 also includes a second gear 48 disposed concentrically with the load sheave (winding portion) 62. The second gear 48 is fixed to the load sheave 62 and journaled to the main body 2 via a rotary shaft 63 that passes through them. With this configuration, the second gear 48 can rotate integrally with the load sheave (winding portion) 62. The second gear 48 also meshes with the first gear 47.

[0020] The adjustment mechanism 7 is configured to adjust the tension applied to the belt 44 of the transmission mechanism 4. The adjustment mechanism 7 includes a first operating unit 71 that displaces the third pulley 43. This first operating unit 71 is configured to move the third pulley 43 toward and away from the first pulley 41. With this configuration, when the third pulley 43 is positioned farthest from the first pulley 41, the perimeter of the triangle formed by the central axes of the three pulleys 41 to 43 is maximized, thereby applying the strongest tension to the belt 44. When the motor 31 is rotated in this state, the rotational force is transmitted to the second pulley 42, causing the rotation shaft 45 to rotate. As a result, the load sheave 62 rotates via the first gear 47 and the second gear 48, and the chain 61 can be wound around the load sheave 62.

[0021] On the other hand, when the third pulley 43 is positioned closest to the first pulley 41, the perimeter of the triangle is minimized, and tension on the belt 44 can be released. Even if the motor 31 is rotated in this state, the torque is not transmitted to the second pulley 42. Furthermore, the degree of tension on the belt 44 can be continuously adjusted between the position where the third pulley 43 is furthest from the first pulley 41 and the position where the third pulley 43 is closest to the first pulley 41. This configuration allows for a simple operation to appropriately adjust the degree of torque transmitted to the load sheave 62 that winds the chain 61. As a result, the wire tensioning device 1 can be operated with greater precision, allowing for quick and safe wire tensioning operations.

[0022] As shown in FIG. 4 , the first operating unit 71 has an arc-shaped slit 201 formed in the side wall 20 of the main body 2 and a bolt 711 inserted through the slit 201 with its head 711a facing inside the main body 2. The bolt 711 rotatably supports the third pulley 43, and a cam lever 712 is fixed to the end of the bolt 711 opposite the head 711a via the third pulley 43. The lever portion 7121 of the cam lever 712 has a base portion (rotation center) 7122 that is cam-shaped. By aligning the longitudinal direction of the lever portion 7121 approximately with the thickness direction of the side wall 20 (i.e., by erecting the lever portion 7121), the side wall 20 is sandwiched between a bearing portion 431 provided inside the third pulley 43 and the head 711a of the bolt 711, preventing displacement of the bolt 711 along the slit 201. On the other hand, by roughly aligning the longitudinal direction of the lever portion 7121 with the in-plane direction of the side wall 20 (i.e., by tilting the lever portion 7121), the bearing portion 431 of the third pulley 43 and the head 711a of the bolt 711 are separated (the clamping of the side wall 20 is released), thereby allowing displacement along the slit 201 of the bolt 711.

[0023] The wire tensioning device 1 further includes a rotation restriction mechanism 12 that restricts rotation of the load sheave (winding portion) 62 in the direction opposite to the winding direction of the chain (long body) 61. The rotation restriction mechanism 12 includes a disk-shaped ratchet gear 121 provided concentrically with the second pulley 42 and at least one ratchet pawl (in this embodiment, two ratchet pawls, a first ratchet pawl 122 and a second ratchet pawl 123) that engage with the teeth of the ratchet gear 121. As shown in FIGS. 8 and 9 , the ratchet gear 121 is rotatably supported on the main body 2 via a rotation shaft 45. The first ratchet pawl 122 is rotatably supported on the main body 2 via a rotation shaft 122a. The second ratchet pawl 123 is fixed to a rotation shaft 63 and rotatably supported on the main body 2 via the rotation shaft 63.

[0024] As shown in FIG. 11 , a disk-shaped disc 124 and a disk-shaped first brake lining 125 are disposed between the ratchet gear 121 and the second pulley 42, in that order from the second pulley 42 side (outside). Furthermore, a disk-shaped brake plate 126 and a disk-shaped second brake lining 127 are disposed between the ratchet gear 121 and the first gear 47, in that order from the first gear 47 side (inside). The first brake lining 125 and the second brake lining 127 are each made of a flexible disk-shaped body containing a resin material and a filler. The disk 124, the first brake lining 125, the ratchet gear 121, and the second brake lining 127 are rotatably attached to the center of the rotary shaft 45 without being fixed to the rotary shaft 45, with their rotational axes aligned with the rotary shaft 45.

[0025] The brake plate 126 is also threadedly engaged with the rotary shaft 45. This allows the brake plate 126 to move along the axial direction (longitudinal direction) of the rotary shaft 45 as the rotary shaft 45 rotates. The brake plate 126 abuts against the first gear 47, thereby restricting further movement of the brake plate 126 toward the inside of the main body 2 along the axial direction (longitudinal direction) of the rotary shaft 45. With this configuration, when the second pulley 42 rotates in a predetermined direction to rotate the load sheave 62 in the direction of winding the chain 61, the brake plate 126 moves toward the second pulley 42 along the axial direction (longitudinal direction) of the rotary shaft 45. The brake plate 126 and the second pulley 42 clamp the disc 124, the first brake lining 125, the ratchet gear 121, and the second brake lining 127. As a result, they are pressed against each other, generating a contact friction force, allowing the ratchet gear 121 to rotate integrally with the second pulley 52. ​​In this state, if the load sheave (winding portion) 62 attempts to rotate in the opposite direction, the first ratchet pawl 122 and the second ratchet pawl 123 are locked by the teeth of the ratchet gear 121, restricting its rotation.

[0026] On the other hand, when the application of tension to the belt 44 of the transmission mechanism 4 by the adjustment mechanism 7 is released, the rotational force of the second pulley 42 in the predetermined direction is removed. Even in this case, the chain 61 can be wound onto the load sheave 62 by manually rotating the second pulley 42 in the predetermined direction. Furthermore, when the second pulley 42 is rotated in the opposite direction from the predetermined direction in this state, the rotating shaft 45 also rotates in the same direction, and the second pulley 42 moves toward the first gear 47 along the axial direction (longitudinal direction) of the rotating shaft 45. As a result, the clamping of the disc 124, first brake lining 125, ratchet gear 121, and second brake lining 127 by the second pulley 42 and the brake plate 126 is released. As a result, the contact frictional force therebetween is weakened or eliminated, and they become independent of each other (become free). As a result, the rotation of the second pulley 42 in the opposite direction is not restricted by the rotation restricting mechanism 12, and the chain 61 can be pulled out from the load sheave 62 by manually performing this operation.

[0027] The second operating unit, which is configured to manually rotate the second pulley 42, is provided on the opposite side of the main body 2 via the second pulley 42. Specifically, this second operating unit has a cover 46 fixed to the end of the rotation shaft 45 opposite the main body 2. The cover 46 has a regular hexagonal mounting portion 462 to which the tip of a tool such as a hexagonal wrench (hexagonal tool) can be attached, and a fall prevention piece 463 that prevents the tool attached to the mounting portion 462 from falling off the cover 46. One end of the fall prevention piece 463 is rotatably provided at a position eccentric to the center of the mounting portion 462. The maximum length of the fall prevention piece 463 along the longitudinal direction is designed to be shorter than the diagonal length of the mounting portion 462. According to this configuration, when the fall-off prevention piece 463 is rotated to a position where it is included in the mounting portion 462 in a plan view (see FIG. 12(a)), the fall-off prevention piece 463 does not get in the way, making it easy to attach a tool to the mounting portion 462. On the other hand, when a tool is attached to the mounting portion 462, when the fall-off prevention piece 463 is rotated to a position where the other end of the fall-off prevention piece 463 protrudes from the mounting portion 462 in a plan view (see FIG. 12(b)), the tool can be easily prevented from falling off the mounting portion 462.

[0028] As shown in FIGS. 1 and 2 , the first attachment portion 5 is a portion where the wire gripper 900 is attached. This first attachment portion 5 has a hook portion 500 and a base portion 520. The hook portion 500 may be provided with an opening / closing member at the front opening (between the base and tip of the hook portion 500) of the hook portion 500 so that the front opening of the hook portion 500 can be opened and closed. In this case, the base portion of the opening / closing member is preferably attached to a fixed shaft provided at the base of the hook portion 500 and is pivotable around the fixed shaft. The tip portion of the opening / closing member may be provided with elastic force by a spring member so that it presses against the tip portion of the hook portion 500. This makes it difficult for the wire gripper 900 attached to the hook portion 500 to come off.

[0029] The base 520 has a housing portion in which a movable pulley is built in, and an end portion that supports the hook portion 500 so that it can rotate freely around a rotation axis. The movable pulley is rotatably supported on a fixed shaft provided in the housing portion. A chain (long body) 61 is hung on the movable pulley. An optimal wire gripper 900 is selected and attached to the hook portion 500 on the ground in advance.

[0030] As shown in Figures 1 and 2, the second mounting portion 8 is a portion where a tail wire 830 for attaching the wire tensioning device 1 to a utility pole C is attached. This second mounting portion 8 is attached to the side of the main body 2 opposite the traction mechanism 6. The mounting position of the second mounting portion 8 and the mounting position of the first mounting portion 5 are approximately equal in the height direction of the main body 2. The second mounting portion 8 has a hook portion 800 and a base portion 820. The hook portion 800 protrudes from the base portion 820 in the width direction of the main body 2, i.e., in the lateral direction. The hook portion 800 may be provided with an opening / closing member at the front opening of the hook portion 800 (between the base and tip of the hook portion 800) so that the front opening of the hook portion 800 can be opened and closed.

[0031] In this case, it is preferable that the base of the opening / closing member is attached to a fixed shaft provided at the base of the hook 800, and that the opening / closing member is swingable around the fixed shaft as a support shaft. The tip of the opening / closing member is preferably given elastic force by a spring member so that it presses against the tip of the hook 800. This makes it difficult for the tail wire 830 attached to the hook 800 to come off. An optimal tail wire 830 is selected for the hook 800 in advance on the ground, and is attached directly or via a hook 832 or the like.

[0032] The third attachment portion 11 is formed by the end of the chain 61 that is pulled out from the main body 2 through the chain inlet / outlet 23. An optimal wire gripper is selected and attached to the third attachment portion 11 in advance on the ground, for example, using a predetermined mounting bracket or the like.

[0033] As shown in Figures 2 and 5(b), a power supply unit 10 is provided at the bottom of the main body 2. The power supply unit 10 has a battery 101 and a battery mounting unit 102 to which the battery 101 is detachably attached. The battery mounting unit 102 is fixed to the main body 2. The power supply unit 10 can supply power to at least the motor 31. The battery 101 can be, for example, a dry cell, a primary battery such as a solar cell, or a secondary battery such as a lithium-ion battery.

[0034] 5(b), 6(a), 6(b), and 7(a), a control board 9 is provided in the upper part of the main body 2. The control board 9 shown in Fig. 13 is, for example, a dedicated control device that controls at least the motor 31, and has a communication unit 91, a storage unit 92, and a control unit 93, and these components are electrically connected via a communication bus 90. In addition to the motor 31, the power supply unit 10 is also electrically connected to the control board 9.

[0035] The communication unit 91 is configured to be able to transmit various electrical signals from the control board 9 to external components. The communication unit 91 is also configured to be able to receive various electrical signals from external components to the control board 9. More preferably, the communication unit 91 has a network communication function, thereby enabling communication of various information with external devices via a network such as the Internet. The communication unit 91 is preferably a wired communication means such as USB, IEEE 1394, Thunderbolt (registered trademark), or wired LAN network communication, but may also include wireless LAN network communication, mobile communication such as 3G / LTE / 5G, BLUETOOTH (registered trademark) communication, etc., as needed. In other words, it is more preferable to implement the communication unit 91 as a collection of these multiple communication means.

[0036] The memory unit 92 stores various information defined above. This can be implemented, for example, as a storage device such as a solid state drive (SSD) that stores various programs related to the wire tensioning device 1 executed by the control unit 93, or as a memory such as a random access memory (RAM) that stores temporarily required information (arguments, arrays, etc.) related to program calculations. The memory unit 92 stores various programs and variables related to the wire tensioning device 1 executed by the control unit 93. It is particularly preferable that information related to construction plans to be carried out using the wire tensioning device 1 be stored in the memory unit 92.

[0037] The control unit 93 processes and controls the overall operation of the wire tensioning device 1. The control unit 93 is, for example, a central processing unit (CPU) not shown. The control unit 93 realizes various functions related to the wire tensioning device 1 by reading out predetermined programs stored in the memory unit 92. In other words, information processing by the software stored in the memory unit 92 is specifically realized by the control unit 93, which is an example of hardware. Note that the control unit 93 is not limited to being single, and multiple control units 93 may be provided for each function. A combination of these may also be used.

[0038] Next, an example of a procedure for tensioning the overhead wire 960 between utility poles C, etc., by pulling the free end 960a of the overhead wire 960, etc., toward the utility pole C using the wire tensioning device 1 described above will be described. [1] First, a wire gripper 900 is attached to the hook portion 500 of the first mounting portion 5 of the wire tensioning device 1 using a mounting hole 902 provided in the wire gripper 900. The device-side mounting end 830b of the tail wire 830 is attached to the hook portion 800 of the second mounting portion 8 using a hook 832. In addition, another wire gripper is attached to the third mounting portion 11 using a predetermined mounting bracket.

[0039] [2] Next, the wire tensioning device 1, to which the tail wire 830, wire gripper 900, and other wire grippers are attached, is carried by the worker to a work position high on the utility pole C. The pole-side attachment end 830a of the tail wire 830 is then wound around the utility pole C and tightened by the tightening member 834, attaching the wire tensioning device 1 to the utility pole C. [3] At this time, the worker operates the first operating unit 71 to release the tension applied to the belt 44 of the transmission mechanism 4 by the adjustment mechanism 7. In this state, the worker attaches a hex wrench (tool) to the cover 46 and rotates the second pulley 42 in the direction opposite to the direction in which the chain 61 is wound around the load sheave 62. This causes the winding side 61b of the chain 61 to be pulled out of the main body 2. It is also preferable to operate the anti-slip piece 463 at this time to prevent the hex wrench from falling off the cover 46. This operation may be performed by driving the motor 31.

[0040] [4] Then, with the chain 61 pulled out, the free end 960a of the overhead wire 960 is gripped by the wire gripper 900 attached to the wire tensioning device 1. [5] Next, the worker operates the first operating unit 71 to apply tension to the belt 44 of the transmission mechanism 4 using the adjustment mechanism 7. [6] Then, the worker operates the transmitter (not shown), and an ON signal (forward rotation signal) for the motor 31 is wirelessly transmitted from the transmitter to the communication unit 91 of the control board 9. When the ON signal is received from the communication unit 91, the control unit 93 of the control board 9 rotates the motor 31 forward, driving the first pulley 41 to rotate forward. The rotation of the first pulley 41 is transmitted to the second pulley 42 via the belt 44. Then, the rotation is transmitted to the second gear 48 via the first gear 47, driving the second gear 48 and the load sheave 62 to rotate forward.

[0041] The load sheave 62 winds the winding side 61b of the chain 61 into the main body 2, and the first mounting part 5 is pulled toward the main body 2. As a result, the free end 960a of the overhead wire 960 is pulled upward together with the wire tensioning device 1 and held toward the utility pole C. At this time, a worker can perform the winding work of the chain 61 by operating a transmitter from a position away from the wire tensioning device 1. Therefore, even if the overhead wire 960 comes loose from the wire gripping device 900, the safety of the worker can be ensured.

[0042] [7] Next, when the chain 61 has been wound into the main body 2 by the desired length, the worker operates the transmitter, and the transmitter wirelessly transmits an OFF signal for the motor 31 to the communication unit 91 of the control board 9. When the OFF signal is sent from the communication unit 91, the control unit 93 of the control board 9 stops the motor 31, and the forward rotation of the first pulley 41 stops. [8] Next, if it is determined that the overhead wire 960 is sufficiently tensioned, the worker on the utility pole C connects the overhead wire 960 to the utility pole C. On the other hand, if it is determined that the overhead wire 960 is not sufficiently tensioned, the free end 960a of the overhead wire 960, which has been pulled and held toward the utility pole C, is gripped by another wire gripper attached to the third mounting portion 11.

[0043] [9] Next, the overhead wire 960 is removed from the wire gripper 900, and an operator operates a transmitter (not shown) to wirelessly transmit an ON signal (reverse rotation signal) for the motor 31 to the communication unit 91 of the control board 9. When the ON signal is received from the communication unit 91, the control unit 93 of the control board 9 reverses the rotation of the motor 31, driving the first pulley 41 to rotate in the reverse direction. This causes the winding side 61b of the chain 61 to be pulled out of the main body 2.

[10] Next, after the free end 960a of the overhead wire 960 is gripped by the wire gripper 900, the overhead wire 960 is removed from the other wire gripper attached to the third mounting portion 11, and the above steps [6] and [7] are executed.

[11] Thereafter, if it is again determined that the overhead wire 960 is not sufficiently tensioned, the above steps

[10] and

[11] are repeated as many times as necessary.

[0044] According to the above-described embodiment, the degree of tension applied to the belt 44 of the transmission mechanism 4 by the adjustment mechanism 7 can be adjusted by simply operating the first operating unit 71, for example, by applying and releasing tension to the belt 44. This makes it easy to transmit and cut off the rotational force of the motor 31 to the load sheave 62. Furthermore, since the attachment unit (second operating unit) 462 for attaching a tool for manually rotating the load sheave 62 is provided outside the main body 2, the attachment of the tool can be performed quickly. Therefore, with this wire tensioning device 1, wire tensioning work can be performed quickly and safely with high operability.

[0045] Furthermore, since the motor 31, control board 9, and power supply unit 10 are concentrated within the main body 2, this also contributes to the miniaturization of the wire tensioning device 1. Note that, in addition to the chain 61, the long body used in the traction mechanism of the wire tensioning device 1 can also be, for example, a wire, a rope, etc. Furthermore, the wire tensioned by the wire tensioning device 1 is not limited to the overhead wire 960, but can also be, for example, a main wire in an orchard, a vine guide wire, a hanging wire for windbreak / bird netting, a bird-proof wire, etc. Furthermore, the wire tensioning device 1 may be provided in each of the following modes.

[0046] (1) A wire tensioning device comprising a main body, a drive mechanism, a traction mechanism, a transmission mechanism, an adjustment mechanism, a first mounting portion, and a second mounting portion, wherein the traction mechanism has a long body and a winding portion that winds up the long body, the drive mechanism has a motor, the transmission mechanism has a plurality of pulleys and a belt wound around the plurality of pulleys, and is configured to transmit the rotational force of the motor to the winding portion of the traction mechanism to wind up the long body, the adjustment mechanism is configured to be able to adjust the tension applied to the belt, the first mounting portion is held midway along the longitudinal direction of the long body, and the second mounting portion is attached to the main body.

[0047] (2) In the wire tensioning device described in (1) above, the plurality of pulleys include a first pulley connected to the rotating shaft of the motor, a second pulley rotatably supported on the main body, and a third pulley displaceably arranged relative to the main body.

[0048] (3) In the wire tensioning device described in (2) above, the adjustment mechanism includes a first operating unit that displaces the third pulley, and the first operating unit is configured to move the third pulley closer to and away from the first pulley.

[0049] (4) In the wire tensioning device described in (3) above, the first operating part has an arc-shaped slit formed in the main body part, a bolt inserted into the slit with its head inside the main body part and rotatably supporting the third pulley, and a cam lever fixed to the end of the bolt opposite the head via the third pulley and configured to allow and prevent displacement of the bolt along the slit.

[0050] (5) A wire tensioning device as described in any one of (2) to (4) above, further comprising a rotation restriction mechanism that restricts the rotation of the winding portion in the direction opposite to the winding direction of the elongated body, the rotation restriction mechanism having a ratchet gear that is arranged concentrically with the second pulley and can rotate integrally with the second pulley, and at least one ratchet pawl that engages with the teeth of the ratchet gear to restrict the rotation when the winding portion attempts to rotate in the opposite direction.

[0051] (6) In the wire tensioning device described in any one of (2) to (5) above, the transmission mechanism further has a first gear arranged concentrically with the second pulley and rotating integrally with the second pulley, and a second gear arranged concentrically with the winding section, rotating integrally with the winding section, and meshing with the first gear.

[0052] (7) The wire tensioning device described in (6) above further includes a second operating unit that allows the second pulley to be rotated manually, and the second operating unit is located on the opposite side of the main body unit via the second pulley.

[0053] (8) The wire tensioning device according to any one of (1) to (7) above, further comprising a control board that controls at least the motor.

[0054] (9) The wire tensioning device according to any one of (1) to (8) above, further comprising a power supply unit that supplies power to at least the motor. Of course, this is not a limitation.

[0055] Finally, while various embodiments of the present disclosure have been described, they are presented as examples and are not intended to limit the scope of the invention. The novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. Such embodiments and modifications are intended to be included within the scope and spirit of the invention, as well as within the scope of the inventions and their equivalents as defined in the claims.

[0056] 1: Wire tensioning device, 2: Main body, 20: Side wall, 201: Slit, 21: Fixture, 22: Chain inlet / outlet, 23: Chain inlet / outlet, 3: Drive mechanism, 31: Motor, 32: Rotating shaft, 4: Transmission mechanism, 41: First pulley, 42: Second pulley, 43: Third pulley, 431: Bearing part, 44: Belt, 45: Rotating shaft, 46: Cover, 46a: Through hole, 461: Screw, 462: Mounting portion, 463: Fall prevention piece, 47: First gear, 48: Second gear, 5: First mounting portion, 500: Hook portion, 520: Base portion, 6: Traction mechanism, 61: Chain, 61a: Fixed side portion, 61b: Winding side portion, 62: Load sheave, 63: Rotating shaft, 7: Adjustment mechanism, 71: Operation portion, 711: Bolt, 711a: Head portion, 712: Cam lever, 712 1: Lever portion, 7122: Base portion, 8: Second mounting portion, 800: Hook portion, 820: Base portion, 830: Back wire, 830a: Mounting end portion on utility pole side, 830b: Mounting end portion on device side, 832: Hook, 834: Fastening member, 9: Control board, 90: Communication bus, 91: Communication unit, 92: Memory unit, 93: Control unit, 10: Power supply unit, 101: Battery, 102: Battery mounting portion, 11 : third mounting portion, 12: rotation restriction mechanism, 121: ratchet gear, 122: first ratchet pawl, 122a: rotating shaft, 123: second ratchet pawl, 124: disc, 125: first brake lining, 126: brake plate, 127: second brake lining, 900: wire gripper, 902: mounting hole, 960: overhead line, 960a: free end, C: utility pole

Claims

1. A wire tensioning device comprising a main body, a drive mechanism, a traction mechanism, a transmission mechanism, an adjustment mechanism, a first mounting part, and a second mounting part, wherein the traction mechanism has a long body and a winding part that winds up the long body, the drive mechanism has a motor, the transmission mechanism has a plurality of pulleys and a belt wound around the plurality of pulleys, and is configured to transmit the rotational force of the motor to the winding part of the traction mechanism to wind up the long body, the adjustment mechanism is configured to be able to adjust the tension applied to the belt, the first mounting part is held midway along the longitudinal direction of the long body, and the second mounting part is attached to the main body.

2. A wire tensioning device as described in claim 1, wherein the plurality of pulleys include a first pulley connected to the rotating shaft of the motor, a second pulley rotatably supported on the main body, and a third pulley displaceable relative to the main body.

3. A wire tensioning device according to claim 2, wherein the adjustment mechanism comprises a first operating part that displaces the third pulley, and the first operating part is configured to move the third pulley closer to and away from the first pulley.

4. A wire tensioning device as described in claim 3, wherein the first operating part has an arc-shaped slit formed in the main body, a bolt inserted into the slit with its head inside the main body and rotatably supporting the third pulley, and a cam lever fixed to the end of the bolt opposite the head via the third pulley and configured to allow and prevent displacement of the bolt along the slit.

5. A wire tensioning device as claimed in any one of claims 2 to 4, further comprising a rotation restriction mechanism that restricts rotation of the winding part in a direction opposite to the winding direction of the elongated body, the rotation restriction mechanism comprising a ratchet gear that is provided concentrically with the second pulley and that can rotate integrally with the second pulley, and at least one ratchet pawl that engages with the teeth of the ratchet gear to restrict the rotation when the winding part attempts to rotate in the opposite direction.

6. A wire tensioning device as claimed in any one of claims 2 to 5, wherein the transmission mechanism further comprises a first gear arranged concentrically with the second pulley and rotating integrally with the second pulley, and a second gear arranged concentrically with the winding section, rotating integrally with the winding section and meshing with the first gear.

7. A wire tensioning device as claimed in claim 6, further comprising a second operating unit that allows the second pulley to be manually rotated, the second operating unit being provided on the opposite side of the main body with the second pulley in between.

8. A wire tensioning device according to any one of claims 1 to 7, further comprising a control board for controlling at least said motor.

9. A wire tensioning device according to any one of claims 1 to 8, further comprising a power supply unit that supplies power to at least said motor.

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