JP7562608B2 - Wire for bird pest prevention device - Google Patents

Description

The present invention relates to a wire for bird pest prevention devices that is attached to electric wires to prevent birds from flying in and building nests.

Birds flying onto overhead power lines can cause accidents in electrical equipment and pollution through their excrement, so various bird pest prevention devices have traditionally been attached to overhead power lines to prevent birds from flying onto them.

A proposed bird prevention device of this kind is made up of a pair of fixed supports attached to both ends of an electric wire that is installed between utility poles, a wire body that is suspended above the electric wire between the fixed supports at a distance, and one or more free supports that are attached at specified intervals along the wire body and the electric wire (Patent Document 1).

However, in the bird pest prevention device mentioned above, the fixed support and free support are each configured as independent parts, so when installing the device on an overhead electric wire, which is high-altitude work, a worker who climbs into the bucket of an aerial work vehicle must stretch the wire that is engaged with the fixed support and free support to secure the free support and the fixed support on the free end to the electric wire, which makes it difficult to work.

Therefore, it has been proposed to connect multiple supports that hold the wire in place to make them easily detachable, to form a set, so that the supports at both ends can be fixed to the electric wire, and to form a section for storing the wire at the connection point of each support, making it easy to deploy the wire (Patent Document 2).

Patent No. 4669277 JP 2017-38488 A

However, none of these conventional techniques involve any special ingenuity in the structure of the filament before it is deployed (tensioned).

The present invention was proposed in light of these points, and aims to provide a wire for bird pest prevention devices that is easy to handle during transportation and simplifies installation work on electric wires.

In order to solve the above problems, the present invention provides a wire for a bird pest prevention device, which is arranged to hold the wire apart from the upper side of an electric wire installed between electric poles,
The filament is characterized in that, before being deployed, it is wound into a coil shape by adhesion at regular intervals of length. The adhesive strength for maintaining the coil shape is set to a level that allows the coil to be unwound by expanding the filament.

Before being deployed, the wire for the bird prevention device of the present invention is wound into a coil shape by gluing at fixed lengths, making it easy to handle during transportation. In addition, the coil can be unwound and tensioned by unfolding the wire, making it much easier to set up the bird prevention device on the electric wire, which is a high-altitude task, and is expected to improve work efficiency.

1 is a schematic diagram showing a state in which a bird damage prevention device according to the present invention is used. FIG. 2 is a front view of the bird damage prevention device according to the present invention in a connected state. FIG. 2 is an overall perspective view showing a frame body of the bird damage prevention device according to the present invention. 1 is an overall perspective view showing a frame body of a bird-damage prevention device according to the present invention with a cover plate flipped up;

Figure 1 is a schematic diagram of a bird pest prevention device (B) according to the present invention attached to an electric wire (W) installed between utility poles (P). This bird pest prevention device (B) is composed of a pair of fixed supports (F)(F) that are attached and fixed to the electric wire (W) and a free support (S) that is positioned between the fixed supports (F)(F) so that it can swing freely relative to the electric wire (W). These fixed supports (F) and free support (S) are connected by a wire (L) that is suspended at a distance above the electric wire (W).

The fixed support (F) and the free support (S) are formed with the same structure, and are composed of a frame body (1) consisting of a roughly C-shaped frame body, a wire engaging portion (3) that protrudes upward from the upper wall (2) of the frame body (1), an electric wire fixing mechanism (C) that clamps and fixes the electric wire (W) within the frame body (1), and a cover plate (4) that can close the opening of the frame body (1).

This electric wire fixing mechanism (C) is composed of a screw body (6) that is screwed through the bottom wall (5) of the frame body (1) and a push plate (7) that is attached to the tip of the screw body (6) and moves up and down inside the frame body (1). This push plate (7) can be switched between a non-holding position in which it descends to the bottom wall side of the frame body (1) and a holding position in which the push plate (7) moves up as the screw body (5) rotates, pressing the electric wire (W) inserted into the frame body (1) against the inner surface of the upper wall of the frame body (1). By adjusting the amount of rise of the push plate (7) so that the electric wire (W) does not come into strong contact with the inner surface of the upper wall of the frame body (1), the frame body (1) is no longer fixed to the electric wire (W), and it becomes a swingable free support device (S).

The cover plate (4), which can close the opening of the frame body (1), has its upper end pivotally supported on the open end of the upper wall (2) of the frame body (1) so that it can swing. An arm portion (9) extends from the upper portion of the side end face (4b) of the cover plate portion (4a) of the cover plate (4) toward the back of the frame space, and is configured so that the arm portion (9) can be positioned in the frame space when the cover plate portion (4a) is flipped up.

In addition, a locking projection (11) that comes into contact with the upper end surface of the cover plate (4) is provided on the outer peripheral surface of the cover plate pivoting portion (10) of the frame body (1), and the upper end surface of the cover plate (4) climbs over this locking projection (11), thereby enabling the cover plate (4) to be maintained in a position that opens the opening of the frame body (1).

As described above, the push plate (7) is attached in a relatively rotatable state to the upper end portion of the screw body (6) that is screwed through the bottom wall (5) of the frame body (1), and is formed to embrace the side edge of the rising wall (12) of the fixed frame body (1). When the screw body (6) is rotated, it moves forward and backward relative to the bottom wall of the frame body (1), so that the push plate (7) moves vertically parallel to the frame body (1) without rotating. In addition, a cover plate insertion groove (13) is formed at the opening end of the push plate (7) through which the side edge of the cover plate (4) is inserted. The side edge of the cover plate (4) is formed so that it does not fit into the cover plate insertion groove (13) of the cover plate (4) within a certain range on the downward side of the push plate (7), and in this state the cover plate (4) can swing, but when the push plate (7) moves a certain height away from the bottom wall (5) of the frame body (1), the cover plate insertion groove (13) and the side edge of the cover plate (4) fit together, and the swing of the cover plate (4), i.e., the opening and closing of the cover plate (4), is restricted.

In addition, a bifurcated fork-shaped connecting piece (17) is formed on one side of the bottom wall (5) of the frame body (1). A U-shaped groove (18) spanning the threaded body (6) formed on this connecting piece (17) is inserted between the bottom wall (5) of the frame body (1) and the push plate (7) of the adjacent bird damage prevention device (B), and the threaded body (6) is operated downward to clamp the connecting piece (17) between the underside of the push plate (7) and the upper surface of the bottom wall (5) of the frame body, thereby connecting adjacent bird damage prevention devices (B).

The filament (L) is made of weather-resistant fishing line. This filament (L) is wound and glued at regular intervals (for example, 4 m) to maintain its coiled shape. The filament engagement parts (3) protruding upward from the upper wall (2) of the frame body (1) each have a filament passage part (14) through which the filament (L) passes, and two filament attachment parts (15) and (16) to which the filament (L) is attached. The adhesive used to maintain the coiled shape is set to an adhesive strength sufficient to allow the filament (L) to uncoil when it is stretched.

As shown in Figure 2, the bird damage prevention device (B) configured as described above is configured to detachably connect adjacent frame bodies (1) to each other with a connecting piece (17) extending from one side of the bottom wall (5) of the frame body (1). The connecting piece (17) extending from one side of the bottom wall (5) is formed in a bifurcated fork shape, and this bifurcated fork-shaped connecting piece (17) is configured to be inserted between the upper surface of the bottom wall of the frame body (1) and the lower surface of the push plate (7) in a state in which it straddles the screw body (6). By operating the screw body (6) to the lower side of the push plate, the fixed frame body (1) is sandwiched between the bottom wall (5) of the fixed frame body (1) and the lower surface of the push plate (7), and multiple fixed frames (1) are integrated. Then, the integrated multiple frame bodies (1) are transported to the construction site in a state in which the coil-shaped filament (L) is positioned between the filament engagement parts (3) protruding upward from the upper wall (2) of the integrated frame bodies (1).

The fork-shaped connecting piece (17) is formed so that the portion where the screw insertion groove (18) is formed, which is the connecting tip side, is shifted upward by the thickness of the connecting piece. By forming it in this way, the overall level will be uniform when multiple bird pest prevention devices (B) are connected.

When this bird pest prevention device (B) is attached to an electric wire (W) installed between utility poles (P), it is transported to the construction site connected together via the connecting piece (17). However, since the frame body (1) that serves as the fixed support (F) and the frame body (1) that serves as the free support (S) have the same structure, the connecting piece (17) is clamped between the push plate (7) and the bottom wall (5) of the frame body (1), and the cover plate (4) placed on the opening of the frame body (1), which is formed in an approximately C-shape, can swing freely.

Therefore, with the cover plates (4) of the series of bird pest prevention devices (B) open, the bird pest prevention devices (B) can be attached to the electric wire (W) in one go using a live-line tool such as insulated pliers. When the electric wire (W) enters the frame of the frame body (1) during attachment to the electric wire (W), it comes into contact with the arm portion (9), disengaging the cover plate (4) from the frame body (1), and the opening of the frame body (1) is blocked by the cover plate (4). In this state, the screw body (6) of the frame body (1) located at the end is operated to raise the push plate (7). Then, the side edge of the cover plate (4) fits into the cover plate insertion groove (13) formed in the push plate (7), suppressing the opening and closing swing of the cover plate (4) and preventing the frame body (1) from coming off the electric wire.

Then, as the push plate (7) of the frame body (1) located at this end moves up, the electric wire (W) is clamped between the inner surface of the upper wall of the frame body (1) and the push plate (7), so that the frame body (1) can be held in a constant position. At the same time, as the push plate (7) moves up, the restraining force of the connecting piece (17) that was clamped between the push plate (7) and the bottom wall of the frame body (1) is released, so that the next frame body (1) connected to the connecting piece (17) can move away from the frame body (1) fixed to the electric wire (W) and along the electric wire.

After the intermediate frame body (1) is engaged with the electric wire (W), the push plate (7) is lightly operated to push it up to a position where the electric wire (W) is not clamped between the frame body (1) and the inner surface of the upper wall, releasing the fixed state of the connecting piece (17), thereby holding the intermediate frame body (1) in a swingable state relative to the electric wire (W).

When a series of frame bodies (1) are attached to the electric wire (W) and deployed, all of the frame bodies (1) are connected by a linear body (L), which is stretched above the electric wire (W). When the linear body (L) is stretched taut, the screw body (6) of the frame body (1) located at the other end is operated to raise the push plate (7), and the electric wire (W) is clamped between the push plate (7) and the inner surface of the ceiling wall of the frame body (1), and the other frame body (1) is fixed in a predetermined position, so that the frame bodies (1) at both ends are fixed and the middle frame body (1) is installed in a state where it can swing around the electric wire (W). As a result, even if a bird tries to land on the linear body (L), the frame body (1) located in the middle, which serves as a free support device (S), swings around the contact point with the electric wire (W) as a fulcrum, and the bird cannot land on the linear body (L).

In the above embodiment, the arm portion (9) extends from the upper portion of both end faces (4b) of the cover plate portion (4a) of the cover plate (4) toward the inner portion of the frame space, but the arm portion (9) may be formed only on the upper portion of one side of the cover plate (4). It may also be formed so as to protrude from the upper portion of the cover plate (4) in the middle of the opening width.

The connecting piece (17) extending from the bottom wall (5) of the frame body (1) may be a flat plate with no step in between.

In this way, in the bird pest prevention device (B) of the present invention, the wire fixing mechanism (C) for fixing to the electric wire is used to firmly integrate the fixed support (F) and the free support (S), making it easy to handle during transportation. In addition, the fixed support (F) and the free support (S) can be separated when fixing the fixed support (F) to the electric wire (W), making it easy to install the bird pest prevention device (B) on the electric wire (W).

The bird pest prevention device of the present invention is suitable as a bird pest prevention device to be attached to electric wires installed between utility poles in urban areas where the distance between utility poles is relatively short.

P... utility pole, W... electric wire, L... wire member, C... wire fixing mechanism, 1... frame body, 4... cover plate, 2... upper wall of frame body, 3... wire member engagement portion, 5... bottom wall of frame body, 6... screw body, 7... push plate, 9... arm portion, 10... pivot portion, 11... locking protrusion, 13... cover plate insertion groove portion.

Claims (1)

A wire body (L) for a bird pest prevention device that holds the wire body (L) at a distance from the upper side of an electric wire (W) installed between electric poles (P),
The filament (L) for a bird pest prevention device is characterized in that, before being deployed, it is wound into a coil shape by adhesion at regular intervals to maintain its shape.

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