Bird-proof cable tensioning device

Abstract

To provide a bird-proof cable tensioning device capable of safely and easily adjusting the tension of the bird-proof cable, effectively preventing the bird-proof cable left outdoors from being broken, and extending the period of use of the bird-proof cable. [Solution] A tensioning device 10 that stretches multiple bird-proof cables 20 over a protected area, and is equipped with bird-proof cable mooring means 30 installed at a high point on a support 50 and bird-proof cable winding means 40 installed at a low point on the support 50, and both ends of the bird-proof cables 20 are connected to the winding means 40 so that winding or unwinding operations of the bird-proof cables 20 can be performed separately at both ends of the bird-proof cables.

Description

[Technical Field]

[0001] The present invention relates to a bird-proof cable tensioning device that stretches bird-proof cables over orchards and farm fields to prevent birds from invading. [Background technology]

[0002] Bird damage to orchards and fields is severe. One known method for preventing birds from entering buildings is to use bird-proof cables. Bird-proof cables are high-strength, ultra-thin cables that are difficult for birds to see (Patent Document 1).

[0003] Patent Document 2 discloses erecting a plurality of posts around an orchard or the like and suspending a bird-proof cable horizontally between the heads of these posts. If the end of the bird-proof cable is simply tied to a fixing member, the knot in the cable becomes a weak point and is prone to breakage. For this reason, spring clips with elasticity are attached to the ends of the bird-proof cables.

[0004] Furthermore, Patent Document 3 discloses that a hollow bolt is screwed into a spring clip and the tension of the bird-proof cable is adjusted by rotating the hollow bolt. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-303467 [Patent Document 2] Utility Model Registration No. 3221397 [Patent Document 3] Japanese Patent Application Laid-Open No. 2001-136894 Summary of the Invention [Problem to be solved by the invention]

[0006] Conventional bird-proof cable tensioning technology involves the following issues that need to be resolved: <1> Because the bird-proof cables are installed at high altitudes, installing and replacing them requires a lot of time and effort. In particular, the task of stringing bird-proof cables at high altitudes is extremely dangerous. <2> Bird-proof cables expand and contract with temperature changes between winter and summer. If the bird-proof cable is installed at a high altitude, it becomes difficult to adjust the cable tension. If the anti-bird cable is left to stretch and sag, its anti-bird function will be reduced, and if the anti-bird cable contracts and falls into an over-tensioned state, it will break. <3> Because bird-proof cables are left outdoors, they are repeatedly subjected to external forces such as wind pressure. As a result, stress is concentrated at specific locations such as the fixed portion of the bird-proof cable, causing the bird-proof cable to break before its useful life is over. <4> There is a demand for technology proposals that allow even aging farmers to easily and safely install and replace bird-proof cables.

[0007] The present invention has been made in view of the above points, and has an object to provide a bird-proof cable tensioning device that can solve the above problems. [Means for solving the problem]

[0008] The present invention provides a bird-proof cable tensioning device that includes a plurality of posts erected in a protected area and a pair of opposing posts, and a bird-proof cable tensioned between the posts, and that stretches the plurality of bird-proof cables over the protected area, a pair Installed at a high point on the support 、 Bird-proof cable A pair of moorings Mooring means; a pair Install it at a low point on the support 、 Bird-proof cable A pair of winding drums capable of winding or unwinding and a winding means, and the bird-proof cable is moored to the pair of mooring means and stretched in a portal shape, record defense Both ends of the bird cable The pair Connected to a winding means, The pairOf the winding means The unwinding of the bird-proof cable by the winding drum of one winding means and the winding of the bird-proof cable by the winding drum of the other winding means are operated separately. configured as possible. In another form of the present invention, the bird-proof cable moored between the pair of mooring means is tensioned so as to be slidable along the tensioning direction by winding or unwinding operations using a pair of winding means connected to both ends of the bird-proof cable. In another form of the present invention, an end of a new bird-proof cable is connected to one end of the existing bird-proof cable that is moored to the pair of mooring means and arranged in a portal shape, and the existing bird-proof cable can be used as a guide cable by winding up one of the bird-proof cable winding means installed at a low position on the support pillar. In another aspect of the invention, the mooring means comprises a pair of mounting brackets attached to the mast at an elevated position and a pulley pivoted between the mounting brackets. In another embodiment of the present invention, the winding means comprises a pair of mounting brackets attached to a lower portion of the support, and a reversible winding drum disposed between the mounting brackets. [Effects of the Invention]

[0009] The present invention has at least one of the following advantages. <1> The bird-proof cable tensioning device according to the present invention is configured so that the tension of the bird-proof cable can be adjusted at a low point on the support pole. Therefore, the tension adjustment work of the bird-proof cable can be easily performed by the worker in a safe environment on the ground without climbing to a high place. Furthermore, even if the bird-proof cable becomes loose due to creep, it can be easily tensioned to eliminate the looseness. <2> Bird-proof cables expand or contract with temperature changes between winter and summer, but the tension of the bird-proof cable can be optimally adjusted in response to temperature changes, making it possible to prevent the bird-proof cable from losing its bird-proof function due to excessive expansion, or from breaking due to excessive tension. <3> By sliding the bird-proof cable moored between the pair of mooring means as needed, the bending position of the bird-proof cable bent along the mooring means can be changed. Therefore, it is possible to effectively prevent the bird-proof cable left outdoors from breaking, and to extend the service life of the bird-proof cable. <4> Even if the bird-proof cable is damaged by contact with a bird or flying object, the damaged area can be shifted and the cable can continue to be used. Therefore, there is no need to re-lay bird-proof cables. <5> By using the existing bird-proof cable as a guide cable, workers can safely and easily replace it with a new bird-proof cable without having to climb to a high place. <6> Even elderly farmers can easily and safely install and replace bird-proof cables, making this an effective measure for elderly farmers. [Brief explanation of the drawings]

[0010] [Figure 1] An explanatory diagram of a bird-proof cable tensioning device according to the present invention. [Figure 2] Model diagram of tensioning device [Figure 3] Illustration of bird-proof cable mooring means [Figure 4] Illustration of bird-proof cable winding means [Figure 5] Illustration of bird-proof cable replacement work using a tensioning device DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described in detail below.

[0012] <1> Overview of the bird-proof cable tensioning device Referring to Figure 1, the bird-proof cable tensioning device 10 is a bird-prevention facility comprising a plurality of posts 50 erected on the outer periphery of the protected area, a plurality of mooring means 30 installed at a high point (upper part) of each post 50 and mooring the bird-proof cable 20 midway, and a pair of winding means 40, 40 installed at a low point (lower part) of each post 50 and winding and holding both ends of the bird-proof cable 20.

[0013] <2> pillar The support columns 50 are used in the form of two columns (a pair) facing each other. The support poles 50 are steel, concrete or wooden pillars for mounting the mooring means 30 and winding means 40, and are erected along the outer periphery of the protected area. In practice, single pipes can be used for the support posts 50. If necessary, it is also possible to connect a tie rope to the support posts 50 to enhance their self-supporting properties.

[0014] <3> Bird-proof cable The bird-proof cable 20 is a resin cable, a metal cable, or a composite cable that combines these, each of which has excellent tensile strength and creep resistance, and the surface thereof is coated with a functional resin for weather resistance or the like as needed. The diameter of the bird-proof cable 20 is selected appropriately depending on the type of bird, the stretching distance, etc.

[0015] <4> Mooring means The mooring means 30 is attached to the support 50 at a high point and is a mooring device for changing the installation direction of the bird-proof cable 20. The mooring means 30 shown in FIG. 3 will be explained. The mooring means 30 is made up of a pair of mounting brackets 31 and a pulley 33 pivoted between the mounting brackets 31 via a support shaft 32 . The mooring means 30 is fixed to the support 50 via a mounting bracket 31 . The mooring means 30 is not limited to the form illustrated in this example, and the mooring means 30 may be a non-rotating arcuate surface.

[0016] <5> Winding means As shown in FIGS. 1 and 2, the winding means 40 is a device for winding or unwinding the bird-proof cable 20, and two winding means 40, 40 are used in combination for one bird-proof cable 20. The reason why both ends of the bird-proof cable 20 are connected to separate winding means 40, 40 is to allow the bird-proof cable 20 to be wound or unwound separately, thereby sliding the bird-proof cable 20 along the tensioning direction.

[0017] Regarding the winding means 40 illustrated in Figure 4, the winding means 40 comprises a pair of mounting brackets 41, 41, a reversible winding drum 42 arranged between the mounting brackets 41, 41, and a handle 43 for manually rotating the winding drum 42. The winding means 40 further includes a stopper 44, and by meshing the stopper 44 with outer teeth 45 provided on the outer periphery of the winding drum 42, the reverse rotation of the winding drum 42 can be restricted. The winding drum 42 may be electrically driven, such as by a motor.

[0018] In this example, a form in which one set of mooring means 30 and winding means 40 is installed for one support pole 50 is described, but multiple sets of mooring means 30 and winding means 40 may also be installed for one support pole 50.

[0019] [How to install the tensioner] A method for installing the tensioning device 10 will be described with reference to FIGS.

[0020] <1> Erecting the support pillars A plurality of posts 50 are erected along the periphery of a protected area such as an orchard or field. A mooring means 30 is installed at a high point on each support 50, and a winding means 40 is installed at a height close to the ground on the support 50. The installation height of the mooring means 30 is selected appropriately according to the installation height of the bird-proof cable 20.

[0021] <2> Bird-proof cable installation The bird-proof cable 20 is hung in a slack state between a pair of mooring means 30, 30 arranged opposite to each other in a gate-like manner, and then each end of the bird-proof cable 20 is connected to each winding means 40. In the present invention, it is not necessary to stretch the bird-proof cable 20 between the pair of mooring means 30, 30 in a tensed state, but it is sufficient to stretch it in a slack state.

[0022] <3> Winding up bird-proof cables Next, the bird-proof cable 20 is wound by each winding means 40. By winding up the bird-proof cable 20 by each winding means 40, the bird-proof cable 20 is stretched in a gate shape without slack between the heads of a pair of opposing supports 50. In other words, as each winding means 40 is wound, the tension in the bird-proof cable 20 gradually increases, so that the middle section of the bird-proof cable 20 arranged in the section between the pair of mooring means 30, 30 is stretched in an approximately horizontal direction, and both ends of the bird-proof cable 20 arranged in the section between the mooring means 30 and the winding means 40 are stretched in a vertical direction along the support 50.

[0023] In the present invention, each winding means 40 is installed at a height close to the ground on the support 50 so that the worker can wind up the bird-proof cable 20 while standing on the ground, so that the worker can tension the bird-proof cable 20 in a safe working environment on the ground without climbing to a high place.

[0024] <4> Tensioning multiple bird-proof cables The above-described operations are repeated to stretch a plurality of bird-proof cables 20 in parallel. If necessary, a plurality of bird-proof cables 20 are crossed and stretched in a lattice pattern. By stretching a plurality of bird-proof cables 20 above the protected area in this way, birds are prevented from entering the protected area.

[0025] [How to use the tensioning device] Next, another method of using the tensioning device 10 will be described.

[0026] <1> Bird-proof cable tension adjustment The tensioning device 10 according to the present invention has a function of adjusting the tension of the bird-proof cable 20. The bird-proof cable 20 expands or contracts as the temperature changes between winter and summer. The tensioning device 10 according to the present invention has a function for adjusting the tension of the bird-proof cable 20, and therefore the tension of the bird-proof cable 20 can be optimally adjusted by operating the winding means 40. The tension adjustment of the bird-proof cable 20 will be described in detail below.

[0027] In low temperature periods such as winter when contraction of the bird-proof cable 20 is expected, the bird-proof cable 20 is rewound by the winding means 40 in order to avoid excessive tension on the bird-proof cable 20. During high temperature periods such as summer when the bird-proof cable 20 is expected to stretch, the slack in the bird-proof cable 20 is taken up by the take-up means 40.

[0028] The tensioning device 10 of the present invention can optimally adjust the tension of the bird-proof cable 20 in response to temperature changes, thereby effectively preventing a decrease in the bird-proof function due to excessive stretching of the bird-proof cable 20 and breakage of the bird-proof cable 20 due to excessive tension in the bird-proof cable. Furthermore, in the present invention, the tension adjustment work of the bird-proof cable 20 can be easily performed in a safe working environment on the ground without the worker having to climb to a high place.

[0029] <2> Fluctuations in the tensioning position of bird-proof cables The bird-proof cable 20 stretched in a portal shape between a pair of supports 50 is exposed to the outdoors while being bent at right angles at the mooring points of the mooring means 30. After a long period of time, the mooring portion of the bird-proof cable 20 develops a so-called "bending tendency." Furthermore, external forces such as wind pressure that repeatedly act on the middle part of the bird-proof cable 20 act on the mooring part of the bird-proof cable 20 moored to the mooring means 30, so if the bird-proof cable 20 is left unattended for a long period of time, there is a risk that the bird-proof cable 20 will break at the bent part.

[0030] Therefore, in the present invention, a pair of winding means 40, 40 supporting both ends of the bird-proof cable 20 is used to periodically perform winding and unwinding (releasing) operations on the bird-proof cable 20, thereby varying the mooring position of the bird-proof cable 20 relative to the mooring means 30 along the cable direction. That is, by performing an unwinding operation with one of the pair of winding means 40, 40 while performing a winding operation with the other winding means 40 as a set, the mooring position of the bird-proof cable 20 relative to the mooring means 30 is forcibly shifted. The direction and amount of displacement of the bird-proof cable 20 are selected as appropriate.

[0031] The mooring position of the bird-proof cable 20 relative to the mooring means 30 is changed as needed. By forcibly moving the bird-proof cable 20 along the tensioning direction, the bent portion of the bird-proof cable 20 that was previously moored along the bent surface of the mooring means 30 is straightened. Therefore, the bird-proof cable 20 left outdoors can be effectively prevented from breaking, and the bird-proof cable 20 can be used for a long period of time.

[0032] <3> Replacing bird-proof cables When replacing the bird-proof cable 20, it is possible to replace the existing bird-proof cable 20a with a new bird-proof cable 20b. In describing the work of replacing the bird-proof cable with reference to FIG. 5, the existing bird-proof cable 20a and the new bird-proof cable 20b will be distinguished from each other.

[0033] First, a rewinding operation is performed by one of the winding means 40 (the right one) to pull out the bird-proof cable 20a and separate it from the right winding means 40. One end of the new bird-proof cable 20b to be replaced is connected to one end of the removed existing bird-proof cable 20a. On the left side of the existing bird-proof cable 20a, an operator can pull in the existing bird-proof cable 20a manually or with the left winding means 40, thereby pulling in the new bird-proof cable 20b at the same time. In this way, by utilizing the existing bird-proof cable 20a, a new bird-proof cable 20b is moored in a gate-like manner to a pair of mooring means 30, 30 arranged opposite each other and hung across it, and then each end of the new bird-proof cable 20b is connected to the winding means 40, 40, respectively. The bird-proof cable 20b is wound up by the winding means 40 until there is no slack in the cable, and the work of replacing the bird-proof cable 20b is completed.

[0034] In the present invention, by utilizing the existing bird-proof cable 20a, the work of replacing the bird-proof cable 20b with a new one can be carried out in a short time in a safe working environment on the ground. [Explanation of symbols]

[0035] 10. Bird-proof cable tensioning device 20. Bird-proof cable 20a···Existing bird-proof cable 20b New bird-proof cable 30. Mooring means 31 Bracket 32...Spindle 33 Pulley 40. Winding means 41 Bracket 42..... Winding drum 43 Handle 44 Stopper 45...Peripheral teeth 50... Prop

Claims

1. A bird-proof cable tensioning device including a plurality of posts erected in a protected area and a pair of opposing posts, the bird-proof cables stretched between the posts, and the bird-proof cables stretched over the protected area, a pair of mooring means that are installed at high positions on the pair of supports and that can moor bird-proof cables; a pair of winding means installed at a low position on the pair of supports and having winding drums capable of winding or unwinding the bird-proof cable; The bird-proof cable is moored to the pair of mooring means and stretched in a portal shape, Connecting both ends of the bird-proof cable to the pair of winding means, The winding drum of one of the pair of winding means is configured to unwind the bird-proof cable, and the winding drum of the other winding means is configured to wind the bird-proof cable separately. Bird-proof cable tensioning device.

2. 2. A bird-proof cable tensioning device as described in claim 1, characterized in that the bird-proof cable moored between the pair of mooring means is tensioned so that it can slide along the tensioning direction by winding or unwinding operations using a pair of winding means connected to both ends of the bird-proof cable.

3. The bird-proof cable tensioning device of claim 1 is characterized in that an end of a new bird-proof cable is connected to one end of the existing bird-proof cable that is moored to the pair of mooring means and arranged in a portal shape, and the existing bird-proof cable can be used as a guide cable by winding up one of the bird-proof cable winding means installed at a low position on the support.

4. 2. The bird-proof cable tensioning device according to claim 1, wherein the mooring means comprises a pair of mounting brackets attached to a high position on the support, and a pulley pivotally supported between the mounting brackets.

5. 2. The bird-proof cable tensioning device according to claim 1, wherein the winding means comprises a pair of mounting brackets attached to a low part of the support and a reversible winding drum disposed between the mounting brackets.

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