Bird damage prevention equipment

Abstract

To provide a bird damage prevention device that is easy to install and firmly grips thin wires. [Solution] The bird damage prevention device comprises a cable gripping portion and a thin wire gripping portion connected to the cable gripping portion. The thin wire gripping portion comprises a base portion connected to the cable gripping portion, a fixed portion provided on the base portion and having a protrusion, and a movable portion provided so as to be movable relative to the fixed portion and having a recess that fits into the protrusion. The protrusion protrudes from the base portion. The thin wire gripping portion is configured to grip a thin wire by sandwiching it between the protrusion of the fixed portion and the recess of the movable portion in a way that bends the wire.

Description

Technical Field

[0001] The present disclosure relates to a bird damage prevention device.

Background Art

[0002] Patent Document 1 discloses a bird damage prevention device that prevents birds from perching on cables such as electric wires. The bird damage prevention device of Patent Document 1 includes a pair of gripping members that grip the cable and a wire attachment portion that stretches a thin wire above the cable. The thin wire is attached by being wound around a fixing piece of the wire attachment portion.

[0003] The bird damage prevention device of Patent Document 2 includes a main body supported by a cable, a base portion protruding vertically upward from the main body, and a pair of wire winding rods that are continuous with the base portion and around which a thin wire is wound. The thin wire is attached by being wound around the pair of wire winding rods.

[0004] The bird damage prevention device of Patent Document 3 includes a cable attachment portion attached to a cable, a first gripping member, and a second gripping member. The first gripping member includes a support portion, and a fitting recess having an opening is provided in the support portion. The second gripping member is provided rotatably with respect to the first gripping member and includes a pressing portion that presses a thin wire fitted in the fitting recess against the support portion. When the first gripping member and the second gripping member are closed with the thin wire fitted in the fitting recess, the thin wire is pressed by the pressing portion of the second gripping member, pressed against the support portion of the first gripping member, and sandwiched between the support portion and the pressing portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document ②

Patent Document 3

Summary of the Invention

[0006] The bird damage prevention devices described in Patent Documents 1 and 2 grip the thin wire by winding it around a predetermined part. However, winding the thin wire around the thin wire attachment part or the thin wire winding rod makes the work complicated and tends to take a long time. The bird damage prevention device described in Patent Document 3 clamps the thin wire between a first gripping member and a second gripping member, making the attachment of the thin wire relatively easy. However, because the convex pressing part of the second gripping member pushes out the thin wire that is fitted into the fitting recess of the first gripping member, it is difficult to apply strong tension to the thin wire and to grip the thin wire firmly.

[0007] This disclosure aims to provide a bird damage prevention device that is easy to install and can firmly grip thin wires. [Means for solving the problem]

[0008] The bird damage prevention device of this disclosure comprises a cable gripping portion and a thin wire gripping portion connected to the cable gripping portion. The thin wire gripping portion has a base portion connected to the cable gripping portion, a fixed portion provided on the base portion and having a protrusion, and a movable portion provided so as to be movable relative to the fixed portion and having a recess that fits into the protrusion. The protrusion protrudes from the base portion. The thin wire gripping portion is configured to grip a thin wire by sandwiching it between the protrusion of the fixed portion and the recess of the movable portion in a way that bends the wire. [Effects of the Invention]

[0009] This disclosure provides a bird-repellent device that is easy to install and firmly grips thin wires. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view of a bird damage prevention device. [Figure 2] Figure 2 is a perspective view of a bird damage prevention device. [Figure 3] Figure 3 is a cross-sectional view taken along the line III-III in Figure 1. [Modes for carrying out the invention]

[0011] (Description of one form of this disclosure) First, embodiments of this disclosure will be listed and described. (1) A bird damage prevention device according to one aspect of the present disclosure comprises a cable gripping portion and a thin wire gripping portion connected to the cable gripping portion. The thin wire gripping portion comprises a base portion connected to the cable gripping portion, a fixed portion provided on the base portion and having a protrusion, and a movable portion provided so as to be movable relative to the fixed portion and having a recess that fits into the protrusion. The protrusion protrudes from the base portion. The thin wire gripping portion is configured to grip a thin wire by sandwiching it between the protrusion of the fixed portion and the recess of the movable portion in a way that bends the wire.

[0012] According to this disclosure, since the thin wire is gripped by being sandwiched between a fixed part and a movable part, the attachment of the thin wire is easier compared to when the thin wire is wrapped around a predetermined part for gripping.

[0013] The bird-repellent device of this disclosure grips a thin wire between a protrusion of a fixed part and a recess of a movable part. If, unlike this disclosure, the thin wire is gripped by being sandwiched between two flat parts, for example, when a bird touches the thin wire, the thin wire is easily pulled linearly along the axis of the wire, making it difficult to firmly grip the wire. However, according to this disclosure, the thin wire is actively bent and gripped between the protrusion of the fixed part and the recess of the movable part, so even if the thin wire is pulled, it is less likely to be displaced, and it is easier to firmly grip the wire.

[0014] In addition, in this disclosure, the protrusion is provided on the fixed part rather than the movable part, and it protrudes beyond the base part. If, unlike this disclosure, the protrusion is provided on the movable part and the recess is provided on the fixed part, then during installation, the thin wire running from the base part along the recess of the fixed part is easily pushed by the protrusion of the movable part, causing it to move between the recess and the protrusion. Alternatively, as in Patent Document 3, a configuration in which the protrusion provided on the fixed part does not protrude beyond the base part is also conceivable, in other words, a configuration in which the fixed part has a protrusion that does not protrude beyond the base part, and two recesses that are recessed from the base part on either side of the protrusion. However, in this configuration, the thin wire running from the base part along the unevenness of the fixed part is easily pushed by the interlocking protrusions of the movable part, causing it to move between the fixed part and the movable part, making it difficult to firmly grip the thin wire. On the other hand, according to this disclosure, the protrusion is provided on the fixed part and it protrudes beyond the base part. Because the thin wire can be guided from the base portion along the protruding portion that extends beyond the base portion, it does not displace much even when pressed by the recess of the movable part, and therefore the thin wire can be gripped firmly.

[0015] (2) In (1) above, the movable part may be provided so as to be rotatable with respect to the fixed part about an axis.

[0016] According to this disclosure, since the movable part is provided so as to be rotatable with respect to the fixed part around an axis, the rotation of the movable part makes it easy to grip a thin wire by sandwiching it between the convex part of the fixed part and the concave part of the movable part, thus making it easy to attach the thin wire.

[0017] (3) In (2) above, the shaft may be provided in a position opposite to the cable gripping portion, with the protrusion in between.

[0018] If, contrary to this disclosure, the shaft is provided between the protrusion and the cable gripping portion, when the movable portion rotates away from the fixed portion, the movable portion will be located in the space between the cable gripping portion and the protrusion of the thin wire gripping portion, making it difficult to provide ample workspace. Furthermore, the rotated movable portion is likely to interfere with the cable gripping portion. It is also difficult to provide a shaft requiring a certain level of mechanical strength in the connecting portion between the cable gripping portion and the protrusion of the thin wire gripping portion.

[0019] However, according to the present disclosure, the shaft is provided at a position opposite to the cable gripping portion across the convex portion. Therefore, even when the movable portion rotates away from the fixed portion, the movable portion does not locate in the space between the cable gripping portion and the convex portion of the fine wire gripping portion, so it is easy to take a wide working space. Further, the rotated movable portion is less likely to interfere with the cable gripping portion. Compared with the case where the shaft is provided between the convex portion and the cable gripping portion, the degree of freedom in design is high, and it is easy to maintain a high mechanical strength of the shaft.

[0020] (4) In any one of (1) to (3) above, the fine wire gripping portion is provided on the base portion, and further has a plurality of pairs of groove portions for locking the fine wire along the longitudinal direction in which the convex portion extends, and the convex portion may be provided between each pair of the groove portions.

[0021] According to the present disclosure, a plurality of pairs of groove portions for locking the fine wire are provided along the longitudinal direction in which the convex portion extends. For example, when two pairs of groove portions are provided along the longitudinal direction, the fine wire locked by one pair of groove portions can be locked to the other pair of groove portions across the convex portion, so that within one preventer, the position of gripping the fine wire in the longitudinal direction can be adjusted.

[0022] (Details of an embodiment of the present disclosure) A specific example of the bird damage prevention portion according to an embodiment of the present disclosure will be described while referring to the drawings. In this embodiment, the "upward direction", "downward direction", "left direction", "right direction", "front direction", and "rear direction" are relative directions set for convenience of explanation with respect to the bird damage preventer 1 shown in FIG. 1. It should be noted that the present disclosure is not limited to these examples, and is shown by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

[0023] The bird damage prevention device 1 of this embodiment is configured to prevent birds from perching on overhead cables such as power lines. Specifically, multiple bird damage prevention devices 1 of this embodiment are arranged at predetermined intervals along the cable, and thin wires W are stretched above the cable, almost parallel to the cable. The stretched thin wires W come into contact with the feet of birds that try to perch on the cable, making it difficult for birds to stay on the cable.

[0024] Figures 1 and 2 are perspective views of a bird damage prevention device 1 according to one embodiment of the present disclosure. As illustrated in Figures 1 and 2, the bird damage prevention device 1 comprises a cable gripping portion 10 and a thin wire gripping portion 20. As will be described later, the thin wire gripping portion 20 can transition between a closed state and an open state. Figure 1 illustrates the thin wire gripping portion 20 in the closed state, and Figure 2 illustrates the thin wire gripping portion 20 in the open state.

[0025] The cable gripping portion 10 is configured to grip cables such as electric wires. The cable gripping portion 10 has a hollow cylindrical shape and may include a pair of semi-cylindrical portions 11 that form the cylinder. The pair of semi-cylindrical portions 11 can be appropriately formed according to the radius of curvature of the outer surface of the cable to be gripped. The cable gripping portion is configured to grip the cable by sandwiching it between the pair of semi-cylindrical portions 11.

[0026] The thin wire gripping portion 20 is provided connected to the cable gripping portion 10. The thin wire gripping portion 20 extends upward from the upper part of the cable gripping portion 10. In this embodiment, the direction in which the thin wire gripping portion 20 extends upward from the upper part of the cable gripping portion 10 is defined as the longitudinal direction D1. The thin wire gripping portion 20 is configured to grip a thin wire W. As illustrated in Figures 1 and 2, the thin wire gripping portion 20 has a base portion 21, a fixed portion 22, a movable portion 23, a shaft 24, and a plurality of pairs of groove portions 25.

[0027] The base portion 21 has a plate shape and constitutes the main body of the thin wire gripping portion 20. The base portion 21 extends upward from the upper part of the cable gripping portion 10. In other words, the base portion 21 extends along the longitudinal direction D1 of the thin wire gripping portion 20. The base portion 21 may be formed integrally with a part of the cable gripping portion 10. The base portion 21 has a guide surface 211 that guides the thin wire W between the fixed portion 22 and the movable portion 23 when the thin wire gripping portion 20 grips the thin wire W (see Figure 2). The guide surface 211 is a plane that extends along the longitudinal direction D1 of the front part of the base portion 21 and is provided on the left and right sides of the fixed portion 22, respectively.

[0028] The base portion 21 may be provided with a receiving portion 212 into which the lance portion 232 of the movable portion 23, which will be described later, is fitted. The receiving portion 212 has two holes, and is configured so that when the thin wire gripping portion 20 transitions from an open state to a closed state, the lance portion 232 of the movable portion 23 is inserted into the holes and catches. The receiving portion 212 is provided on the opposite side of the shaft 24, with the fixed portion 22 in between. In other words, the receiving portion 212 is located at the lower part of the base portion 21 and below the fixed portion 22.

[0029] The fixing portion 22 is provided on the base portion 21. The fixing portion 22 may be formed integrally with the base portion 21. The fixing portion 22 has a protrusion 221. The protrusion 221 extends along the longitudinal direction D1 of the thin wire gripping portion 20. Furthermore, the protrusion 221 is provided so as to protrude beyond the base portion 21. Specifically, the protrusion 221 is erected so as to protrude forward from the guide surface 211. If the protrusion 221 is erected perpendicular to the longitudinal direction D1 from the guide surface 211 of the base portion 21, the thin wire W can be gripped more strongly.

[0030] The movable part 23 has a plate shape and is provided so as to be movable relative to the fixed part 22. In this embodiment, the movable part 23 is provided so as to be rotatable relative to the fixed part 22 about an axis 24. The thin wire gripping part 20 can transition between a closed state and an open state by rotating the movable part 23 about the axis 24. In the closed state, the movable part 23 is in contact with the fixed part 22, and the space between the movable part 23 and the fixed part 22 is closed (see Figure 1). In the open state, the movable part 23 is separated from the fixed part 22, and the space between the movable part 23 and the fixed part 22 is open (see Figure 2).

[0031] The movable part 23 has a recess 231 configured to engage with the protrusion 221 of the fixed part 22. When the thin wire gripping part 20 is in the closed state, the recess 231 of the movable part 23 is engaged with the protrusion 221 of the fixed part 22. When the thin wire gripping part 20 is in the open state, the recess 231 of the movable part 23 is separated from the protrusion 221 of the fixed part 22 and is not engaged. The thin wire gripping part 20 is configured to grip the thin wire W by bending it between the protrusion 221 of the fixed part 22 and the recess 231 of the movable part 23 as the movable part 23 rotates.

[0032] The movable part 23 may be provided with a lance part 232 that fits into the receiving part 212 of the base part 21. In this embodiment, two lance parts 232 are provided on the movable part 23. Each lance part 232 has an elongated rod-shaped main body and a claw part provided at the tip of the main body. When the thin wire gripping part 20 transitions from an open state to a closed state, the main body of the lance part 232 of the movable part 23 is inserted into the hole in the receiving part 212, and the claw part is configured to catch on the rear surface of the base part 21. The lance part 232 is located opposite the shaft 24 across the recess 231, and is located in a position corresponding to the receiving part 212 when the thin wire gripping part 20 is in the closed state.

[0033] The shaft 24 is positioned opposite the cable gripping portion, with the protrusion 221 of the fixing portion 22 in between. In other words, the shaft 24 is located on the upper part of the base portion 21, the cable gripping portion 10 is located on the lower part of the base portion 21, and the protrusion 221 is located between the shaft 24 and the cable gripping portion 10 in the longitudinal direction D1. The shaft 24 is perpendicular to the longitudinal direction D1 and extends in the axial direction D2, which is parallel to the central axis C of the cylinder of the cable gripping portion 10. In this embodiment, the axial direction D2 is from left to right.

[0034] Multiple pairs of grooves 25 are provided on the base portion 21 along the longitudinal direction D1 on which the protrusions 221 of the fixing portion 22 extend. Each pair of grooves 25 is configured to lock onto a thin wire W. Specifically, each groove has a slit with a width slightly smaller than the diameter of the thin wire W, and is configured to lock onto the thin wire W by hooking it into the slit. Protrusions 221 are provided between each pair of grooves 25. In other words, in the axial direction D2, one groove of a pair of grooves 25 is located opposite the other groove of the pair of grooves 25, with the protrusions 221 in between.

[0035] In this embodiment, four pairs of grooves 25 are provided on the base portion 21. Of the four pairs of grooves 25, a pair of grooves 251 is provided on the upper part of the base portion 21, at the position closest to the shaft 24. Below the pair of grooves 251, a pair of grooves 252 is provided spaced apart from the pair of grooves 251. Below the pair of grooves 252, a pair of grooves 253 is provided spaced apart from the pair of grooves 252. Of the four pairs of grooves 25, a pair of grooves 254 is provided on the lower part of the base portion 21, at the position closest to the cable gripping portion 10. The thin wire W may be locked into the pair of grooves 251 so as to be parallel to the axial direction D2, or a portion may be locked into the grooves 251 and the other portion into the grooves 254 so as to be inclined to the axial direction D2.

[0036] Next, the method of using the bird damage prevention device 1 according to this embodiment will be explained. Multiple bird-repellent devices 1 in this embodiment are arranged along the cable at intervals from each other. In the following description, a method will be described in which one bird-repellent device 1 in the closed state is attached to the cable and grips the thin wire W.

[0037] First, the worker attaches the bird damage prevention device 1 to the cable. Specifically, the worker places the pair of semi-cylindrical sections 11 of the cable gripping section 10 along the outer surface of the cable and grips the cable by sandwiching it between the pair of semi-cylindrical sections 11.

[0038] Next, the operator transitions the thin wire gripping section 20 from the closed state to the open state. Specifically, the operator rotates the movable section 23 around the shaft 24 so that it moves away from the fixed section 22. When the thin wire gripping section 20 is in the open state, the movable section 23 is away from the fixed section 22, and the protrusion 221 of the fixed section 22 is not fitted into the recess 231 of the movable section 23. With the thin wire gripping section 20 in the open state, the operator guides the thin wire W from the guide surface 211 of the base section 21 along the protrusion 221 of the fixed section 22, and locks it in place, for example, by hooking it into the slits of the pair of grooves 252 (see Figure 1). With the thin wire W locked in the pair of grooves 252, the operator transitions the thin wire gripping section 20 from the open state to the closed state. Specifically, the operator rotates the movable section 23 around the shaft 24 so that it moves closer to the fixed section 22.

[0039] When the thin wire gripping portion 20 transitions to the closed state, the thin wire W is gripped between the convex portion 221 of the fixed portion 22 and the concave portion 231 of the movable portion 23. Figure 3 is a cross-sectional view taken along the line III-III in Figure 1. As illustrated in Figure 3, since the convex portion 221 of the fixed portion 22 protrudes from the guide surface 211 of the base portion 21, the thin wire W is actively and significantly bent between the convex portion 221 of the fixed portion 22 and the concave portion 231 of the movable portion 23 to grip it. Specifically, the thin wire W is bent at approximately 90 degrees at multiple locations (four locations in this embodiment) between the convex portion 221 of the fixed portion 22 and the concave portion 231 of the movable portion 23, from the left guide surface 211L of the base portion 21, and is gripped along the right guide surface 211R of the base portion 21. Even when the thin wire W is gripped from the right guide surface 211R of the base portion 21, through the protrusion 221, and along the left guide surface 211L of the base portion 21, the thin wire W is significantly bent. The operator then fits the lance portion 232 of the movable portion 23 into the receiving portion 212 of the base portion 21, thereby maintaining the closed state of the thin wire gripping portion 20 and completing the installation of the thin wire W.

[0040] As described above, the thin wire gripping part 20 of this embodiment grips the thin wire W by sandwiching it between the fixed part 22 and the movable part 23. In particular, because the thin wire W is gripped by sandwiching it between the fixed part 22 and the movable part 23 due to the rotation of the movable part 23, the thin wire W can be attached more easily compared to the case where the thin wire W is wrapped around a predetermined part for gripping.

[0041] In this embodiment, the convex portion 221 is provided on the fixed portion 22 and protrudes from the base portion 21. As a result, the thin wire W is actively and significantly bent multiple times between the convex portion 221 of the fixed portion 22 and the recess 231 of the movable portion 23, starting from the left guide surface 211L of the base portion 21, and is gripped along the right guide surface 211R of the base portion 21.

[0042] In this embodiment, the thin wire gripping part 20 grips the thin wire W by significantly bending it between the convex part 221 of the fixed part 22 and the concave part 231 of the movable part 23. Therefore, even if the thin wire W is pulled by a bird, the thin wire W is gripped while significantly bent, making it difficult for the thin wire W to move in a straight line, and as a result, the thin wire W can be gripped firmly.

[0043] Furthermore, unlike this embodiment, there may be configurations in which the movable part 23 has a protrusion, or in which the fixed part 22 has a protrusion that does not protrude beyond the guide surface 211 of the base part 21, and two recesses on either side of it that are recessed from the guide surface 211. However, in all of these configurations, the fixed part 22 has recesses. Therefore, when clamping and fixing the thin wire W, the thin wire W, which is aligned with the recesses or irregularities of the fixed part 22 from the base part 21, is pushed by the protrusion or irregularities of the movable part 23, making it easy for it to move between the fixed part 22 and the movable part 23. Consequently, it is difficult to firmly grip the thin wire W with these configurations.

[0044] In this embodiment, the protrusion 221 is provided on the fixed portion 22 and protrudes from the guide surface 211 of the base portion 21. The thin wire W is gripped along the protrusion 221, which protrudes more than the guide surface 211 of the base portion 21. Therefore, even when the thin wire gripping portion 20 transitions from an open state to a closed state and is pressed against the recess 231 of the movable portion 23, the movement of the thin wire W between the protrusion 221 and the recess 231 is minimal. Consequently, the thin wire gripping portion 20 of this embodiment can firmly grip the thin wire W.

[0045] In this embodiment, the shaft 24 is positioned opposite the cable gripping portion 10, with the protrusion 221 in between. If, unlike this embodiment, the shaft 24 were positioned between the protrusion 221 and the cable gripping portion 10, the movable portion 23 would be located between the cable gripping portion 10 and the protrusion 221 of the thin wire gripping portion 20 when the thin wire gripping portion 20 is in the open state. This would make it difficult to provide ample workspace for attaching the thin wire W. Furthermore, the rotating movable portion 23 would be more likely to interfere with the cable gripping portion 10. Moreover, it would be difficult to provide a shaft requiring a certain level of mechanical strength in the connection portion between the cable gripping portion 10 and the thin wire gripping portion 20, which is a relatively limited area in terms of width and mechanical strength.

[0046] However, in this embodiment, the shaft 24 is positioned opposite the cable gripping portion 10, with the protrusion 221 in between. Therefore, even when the thin wire gripping portion 20 transitions from a closed state to an open state and the movable portion 23 rotates away from the fixed portion 22, the movable portion 23 is not located in the space between the cable gripping portion 10 and the protrusion 221 of the thin wire gripping portion 20, making it easier to provide a wide working space for attaching the thin wire W. Furthermore, since the movable portion 23 rotates around the shaft 24, which is located away from the cable gripping portion 10, the rotated movable portion 23 is less likely to interfere with the cable gripping portion 10. Compared to the case where the shaft 24 is located between the protrusion 221 and the cable gripping portion 10, there is a greater degree of design freedom and it is easier to maintain high mechanical strength of the shaft 24.

[0047] According to this embodiment, multiple pairs of grooves 25 for securing the thin wire W are provided along the longitudinal direction D1 on which the protrusion 221 extends. Therefore, the worker can, for example, secure a portion of the left side of the thin wire W in groove 251 and secure a portion of the right side of the thin wire W in groove 254, passing through the protrusion 221, so that the thin wire W is inclined in the axial direction D2. This allows the thin wire W to be stretched relatively far from the cable on the left side of the bird damage prevention device 1 to prevent large birds from perching on the cable, while the thin wire W can be stretched relatively close to the cable on the right side of the bird damage prevention device 1 to prevent small birds from perching on the cable. In this way, the position in which the thin wire W is gripped in the longitudinal direction D1 can be adjusted within a single bird damage prevention device 1.

[0048] In the above embodiment, the movable part 23 was rotatably mounted relative to the fixed part 22 around the shaft 24, but the relative movement of the movable part 23 with respect to the fixed part 22 is not limited to rotation. For example, instead of the shaft 24, a lance part 232 may be further provided on the upper part of the movable part 23, and a receiving part 212 may be further provided on the upper part of the base part 21. Through the engagement of these lance parts 232 and receiving part 212, the movable part 23 may be mounted so as to be movable forward or backward from the fixed part 22. For example, the movable part 23 may be slidably mounted along the longitudinal direction D1 relative to the fixed part 22. [Explanation of Symbols]

[0049] 1 Bird damage prevention equipment 10 Cable gripping section 11 Half cylinder part 20 Thin wire gripping part 21 Base section 211 Guide surface 212 Receiving part 211L Left guide surface 211R Right guide surface 22 Fixed part 221 Convex part 23 Moving parts 231 Recess 232 Lance section 24 axes 25, 251, 252, 253, 254 Grooves D1 Longitudinal direction D2 Axial direction

Claims

1. Cable gripping part, It comprises a thin wire gripping portion connected to the cable gripping portion, The aforementioned thin wire gripping portion is A base portion is provided connected to the cable gripping portion, A fixing portion having a protrusion is provided on the base portion, It has a movable part that is provided so as to be movable relative to the fixed part and has a recess that fits into the protrusion, The aforementioned protrusion protrudes more than the base portion. The thin wire gripping portion is configured to grip the thin wire by bending it between the convex portion of the fixed portion and the concave portion of the movable portion, in order to prevent damage from birds.

2. The bird damage prevention device according to claim 1, wherein the movable part is provided so as to be rotatable with respect to the fixed part about an axis.

3. The bird damage prevention device according to claim 2, wherein the shaft is provided in a position opposite to the cable gripping portion, with the protrusion in between.

4. The thin wire gripping portion is provided on the base portion and further has a plurality of pairs of grooves that lock the thin wire along the longitudinal direction in which the protrusion extends, The bird damage prevention device according to any one of claims 1 to 3, wherein the protrusions are provided between each pair of grooves.

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