JP2021052723A - Bird nest building aid for transformer - Google Patents

Abstract

To provide a bird nest building aid for a transformer which can be easily installed on a transformer.SOLUTION: A nest building aid 10 comprises a nest building assist part 1 and a transformer attachment part 2. The nest building assist part 1 has a plurality of branch rods 12 which extends radially from a pedestal 11. The transformer attachment part 2 has a pair of engagement arms 21, 21 which can be detachably attached to a top part of the transformer T. The nest building assist part 1 has a female screw part 1ms and a nut part 1n. The transformer attachment part 2 has a bolt member 2b, the bolt member 2b forms: a male screw part 2fs which couples rotatably, base end parts of the pair of engagement arms 21, 21 being opened into a V-shape and can be screwed to the female screw part ms. The nut part 1n has a truncated cone shaped introduction hole 1h. When the nut part 1n is rotated in one direction to the bolt member 2b, the base end parts of the pair of the engagement arms 21, 21 are introduced into the introduction hole 1h; therefore, a pair of hook pieces 2h, 2h can be moved in a direction where the hook pieces approach each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bird nesting aid for a transformer. In particular, by installing a bird nesting aid on the transformer placed below the arm, the bird's nesting is attracted, which avoids nesting on the arm and after the chicks have left the nest, the bird's nest. Regarding the structure of bird nesting aids for transformers that can be easily removed.

When birds such as crows nest in equipment installed on utility poles, there is a concern that this nest will cause a power outage. For example, when a bird carries a wire or the like to a utility pole facility to build a nest, there is a concern that the wire may come into contact with an electric wire and cause a short circuit.

In order to prevent such bird damage, there is known a bird damage prevention device that prevents birds from flying and nesting by attaching an umbrella-shaped framed nesting device to an arm metal installed on a utility pole.

Umbrella-shaped bird damage prevention equipment according to the prior art has a spindle member arranged vertically and a plurality of branches in which the base end is fixed to the outer circumference of the spindle member and extends radially around the spindle member. It consists of a stick. On the other hand, the space on the utility pole where birds can nest differs depending on the mounting condition of the arm and the presence / absence of a switch or a transformer. For this reason, there is a concern that the bird damage prevention device by the conventional technique cannot effectively prevent bird damage because a space where nesting is possible remains depending on the pole mounting condition of the utility pole.

Since the bird damage prevention device by the conventional technology has such a defect, it is possible to freely extend the branch rod to the required space in response to the situation of the utility pole, and to ensure the arrival and nesting of birds. A bird damage prevention device that can be prevented is disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-110571

FIG. 8 is a perspective view showing a pillar-mounted state of the bird damage prevention device according to the prior art. Note that FIG. 8 of the present application corresponds to FIG. 9 of Patent Document 1.

Referring to FIG. 8, the utility pole P has a set of arms A and A fixed to the upper portion thereof in a horizontal state. The strap St is fixed to the arm A via the pin insulator Pi. A set of strain insulators Si and Si are arranged on both sides of a set of arms A and A. A set of strain insulators Si and Si are swingably connected to each other. One strain insulator Si is connected to the arm A via a strap St. The other strain insulator Si is swingably connected to the retention clamp Ci.

Referring to FIG. 8, the retention clamp Ci is covered with an insulating cover. The retention clamp Ci sandwiches an overhead distribution line (hereinafter referred to as an electric wire) W inside the retaining clamp Ci. In the retaining pole shown in FIG. 8, the strain insulator Si connected to the retaining clamp Ci that sandwiches the electric wire W is attached to the arm A that supports the electric pole P, and the electric wire W is supported by the electric pole P. An electric wire W is erected between the pair of retaining clamps Ci and Ci without requiring tension. The portion of the electric wire W that bypasses the utility pole P is called, for example, the edge line We. Although the edge line We is not shown in Patent Document 1, most of the actual cases include the edge line We.

Referring to FIG. 8, the bird damage prevention tool 7 has a spindle member 71 arranged in a vertical state, a plurality of branch members 72 connected in the axial direction of the spindle member 71, and a state of being inclined downward from the branch member 72. A branch rod 73 whose base end portion is fixed to the branch member 72 is provided.

Referring to FIG. 8, the bird damage prevention tool 7 is fixed to the arm A via the arm mounting bracket Br. By inserting the lower end portion of the spindle member 71 into the tubular portion provided on the tip end side of the arm metal mounting bracket Br, the spindle member 71 can be arranged in a vertical state. Further, by arranging the plurality of branch rods 73 in a radial pattern, it is possible to prevent birds from flying and nesting. Since the branch rod 73 is supported in a state of being inclined downward, even if a wire for nesting is carried in, the branch rod 73 falls along the inclination, which makes nesting difficult.

With reference to FIG. 8, the bird damage prevention tool 7 according to Patent Document 1 can easily cut the branch rod 73 to an appropriate length by using a cutter, so that the branch rod 73 does not come into contact with a switch, a transformer, or the like. In addition, a plurality of branch rods 73 can be freely extended in a space on the utility pole P where there is a risk of nesting.

The bird damage prevention device 7 according to Patent Document 1 is fixed to the arm metal mounting bracket Br by lowering the bird damage prevention device 7 from above the arm metal A, but the bird damage prevention tool 7 is fixed from below the arm metal A. It is better to lift the workability. This also applies to existing nest protection devices that are framed like an umbrella.

FIG. 9 is a perspective view showing a general structure of a pillar. Referring to FIG. 9, the utility pole P has an arm A fixed horizontally above the utility pole P. A plurality of electric wires W are hung on the arm A via an insulator.

Referring to FIG. 9, the utility pole P has one or more transformers T installed below the arm A. A lead wire branched from the electric wire W is electrically connected to the transformer T.

With reference to FIG. 8, conventionally, an umbrella-shaped bird guard was installed on the arm A A of the utility pole P, which is easy to nest, and the birds were made difficult to stop on the arm A in an attempt to avoid nesting of the birds. However, even if such an umbrella-shaped bird guard is installed on the utility pole P, it is not easy to prevent the nesting of birds.

Therefore, by changing the way of thinking and installing a bird nesting aid in the transformer for the pillars installed below the arm, we attracted the nesting of birds, thereby avoiding nesting on the arm and at the same time. After the chicks had left their nests, there was a need for a bird nesting aid for transformers that could easily remove the bird's nest. The above can be said to be the subject of the present invention.

The present invention has been made in view of such a problem, and a bird nesting aid can be easily installed on the transformer to avoid nesting on the arm metal, and after the chicks have left the nest, the bird's nest It is an object of the present invention to provide a bird nesting aid for a transformer that can be easily removed.

The present inventor constitutes a bird nesting aid for a transformer with a nesting auxiliary part having a plurality of branch rods radially extending from a pedestal and a transformer mounting part having a pair of engaging arms that can be attached to and detached from the transformer to assist the nesting. The part is composed of a female threaded part formed on the pedestal and a nut part formed on the outer periphery of the pedestal, and the transformer mounting part can rotatably connect the base end part of the engaging arm and be screwed with the female threaded part. It is composed of a bolt member and a hook piece formed on the tip side of the engaging arm and can be sandwiched from the outer peripheral direction on the upper part of the transformer, and an introduction opening of a conical stand is formed in the nut part to the bolt member. When the nut part is rotated in one direction, the base end part of the engaging arm is introduced into the introduction opening, so that the pair of hook pieces can move in the direction closer to each other. He came to invent a new bird nesting aid for transformers.

(1) The bird nesting aid for a transformer according to the present invention has a plurality of branch rods extending radially from a pedestal, and nesting in which the base end portions of these branch rods are rotatably connected to the pedestal. The nesting auxiliary portion includes an auxiliary tool and a transformer mounting portion having a pair of facingly arranged engaging arms that can be attached to and detached from the upper part of the transformer, and the nesting auxiliary portion includes a female screw portion formed at a substantially central portion of the pedestal and the female screw portion. The transformer mounting portion has a pair of gripping arms formed on the outer periphery of the pedestal and which can be gripped by an insulating operation rod having a pair of gripping arms at the tip portion, and the transformer mounting portion has a pair of the above-mentioned engagements which are opened in a V shape. A bolt member in which the base end portion of the joint arm is rotatably connected to one end side and a male screw portion capable of being screwed with the female screw portion is formed on the other end side, and a pair of engagement arms on the tip end side. A conical stand which has a hook piece which is formed and can be sandwiched from the outer peripheral direction on the upper part of the transformer, and the nut portion communicates with the female screw portion and can introduce a base end portion of the pair of engaging arms. When the nut portion has an introduction opening and the nut portion is rotated in one direction with respect to the bolt member, the base end portions of the pair of engaging arms are introduced into the introduction opening, so that the pair of hook pieces are formed. When the nut portion is rotated in the other direction with respect to the bolt member, the base end portions of the pair of engaging arms are separated from the introduction opening, so that the pair of hook pieces can be moved toward each other. Can move away from each other.

(2) A state in which the nesting assisting portion is fixed to an intermediate portion of the branch rod and has a first universal joint formed on the outer periphery thereof, and is arranged between the fixture and the base end portion of the branch rod. A moving tool that is slidably connected to the branch rod and has a second universal joint formed on the outer circumference and a first joint that is rotatably connected to the first universal joint are provided at one end and are adjacent to each other. A plurality of connecting rods having a second joint tool rotatably connected to the second universal joint of the branch rod at the other end, and the moving tool moves toward the fixing tool of the adjacent branch rod. In this state, the diameter of the virtual circumference connecting the tip edges of the plurality of branch rods is enlarged, and in the state where the moving tool moves toward the base end side of the adjacent branch rods, the plurality of branch rods It is preferable to reduce the diameter of the virtual circumference connecting the tip edges of the joint.

(3) It is preferable that the nesting assisting portion further includes fixing means for fixing the bolt member to the pedestal.

(4) The fixing means has a hole portion opened on the inner peripheral surface of the female screw portion, and has a block-shaped main body protruding from the outer peripheral surface of the pedestal and a tip portion can be projected from the inner wall of the hole portion. An engaging pin that abuts on the bolt member from a surface opposite to the outer peripheral surface of the pedestal, and a compression coil spring that is held inside the main body and urges the engaging pin toward the bolt member. It is preferable to do so.

The bird nesting assisting tool for a transformer according to the present invention includes a nesting assisting portion having a plurality of branch rods radially extending from a pedestal and a transformer mounting portion having a pair of engaging arms that can be attached to and detached from the transformer. The portion has a bolt member that can be screwed into the pedestal and a hook piece formed on the tip end side of the engaging arm, and when the pedestal is rotated in one direction with respect to the bolt member, the base end portion of the engaging arm is formed. By being introduced into the introduction opening of the truncated cone formed on the pedestal, the pair of hook pieces can move in the direction of approaching each other, so that the bird nesting aid can be easily installed on the transformer.

It is a front view which shows the structure of the bird nesting aid for a transformer by one Embodiment of this invention, and the main part is shown in the vertical sectional view. It is a front view which shows the structure of the bird nesting aid for a transformer by the said embodiment. It is a perspective exploded view which enlarged the main part of the bird nesting aid for a transformer by the said embodiment. It is a figure which shows the structure of the bird nesting aid for a transformer by the said embodiment, FIG. 4A is a front view which shows the closed state of the nesting aid, and FIG. 4B is the closing umbrella of the nesting aid. A plan view showing the state, FIG. 4C is a front view showing the open state of the nesting aid, and FIG. 4D is a plan view showing the open state of the nesting aid. It is a front view which shows the structure by an example of the insulation operation rod which concerns on this invention. It is an enlarged front view of the main part of FIG. It is a right side view of FIG. It is a perspective view which shows the pillar state of the bird damage prevention tool by the prior art. It is a perspective view which shows the structure of a general pillar.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

(Structure of insulation operating rod)
Before explaining the configuration of the bird nesting aid for a transformer according to one embodiment of the present invention, the configuration of the insulating operation rod for indirect live wire construction used in the present invention will be described.

Referring to FIG. 5, the insulating operation rod 9 is composed of a long operation rod 91 and a gripping tool 92. Further, the insulating operation rod 9 includes an operating rod 93. The gripping tool 92 is attached to the tip of the operating rod 91.

Referring to FIG. 5 or FIG. 6, the gripping tool 92 is composed of a pair of curved gripping arms 9a and 9b that open and close. Then, one gripping arm 9a is a fixed arm having a fixed base end portion, and the other gripping arm 9b rotates about a rotation shaft 9c provided at the base end portion of one gripping arm 9a. It is a movable arm.

Referring to FIG. 5, the actuating rod 93 is held along the operating rod 91. The tip of the actuating rod 93 is rotatably connected to the other gripping arm 9b. Then, by operating the operation lever 94 provided at the base end portion of the operating rod 93, the other gripping arm 9b can be opened and closed with respect to one gripping arm 9a. The insulating operating rod 9 is made of a plastic pipe or the like in which the intermediate portion between the operating rod 91 and the operating rod 93 has an insulating property, and the insulating property is ensured so as to be suitable for indirect live wire construction.

With reference to FIG. 5, when the operating lever 94 is grasped and the operating lever 94 is brought close to the operating rod 91, the other gripping arm 9b can be closed with respect to one gripping arm 9a. When the operating lever 94 is released, the force of the spring (not shown) connected to the operating lever 94 can open the other gripping arm 9b with respect to one gripping arm 9a. FIG. 5 or FIG. 6 shows a state in which the other gripping arm 9b is opened to the maximum with respect to one gripping arm 9a.

With reference to FIG. 6 or 7, one gripping arm 9a projects a tapered gripping claw 91a. The gripping claw 91a forms a gripping surface 90a. The gripping surface 90a is formed substantially parallel to the rotation center of the rotation shaft 9c along the centrifugal direction. Similarly, the other gripping arm 9b projects the tapered gripping claw 91b. The gripping claw 91b forms a gripping surface 90b. The gripping surface 90b is arranged so as to have a predetermined opening angle with the gripping surface 90a. By gripping the operating lever 94 with reference to FIG. 5 or 6, the other gripping surface 90b can be brought closer to the one gripping surface 90a.

The insulation operation rod 9 shown in FIGS. 5 to 7 is a so-called “insulation yatko” capable of gripping a high-voltage distribution line or the like arranged at a high place with a pair of gripping claws 91a and 91b.

[Structure of bird nesting aids for transformers]
(overall structure)
Next, the overall configuration of the bird nesting aid for a transformer according to an embodiment of the present invention will be described. Referring to FIGS. 1 to 4, the transformer bird nesting aid (hereinafter abbreviated as nesting aid) 10 according to the embodiment of the present invention is a transformer T for pillars installed below the arm A. Can be installed in (see Fig. 9).

Referring to FIGS. 1 to 4, the nesting assisting tool 10 includes a nesting assisting portion 1 and a transformer mounting portion 2. The nesting assisting portion 1 includes a plurality of branch rods 12 extending radially from the pedestal 11. Further, the nesting assisting portion 1 rotatably connects the base end portions of the plurality of branch rods to the pedestal 11.

Referring to FIGS. 1 to 3, the transformer mounting portion 2 includes a pair of engaging arms 21 and 21 arranged so as to face each other. The pair of engaging arms 21 and 21 can be attached to and detached from the upper part of the transformer T. The transformer T is composed of a cylindrical transformer main body Tb and a lid body Tc having an outer circumference larger than the outer circumference of the transformer main body Tb (see FIG. 1 or FIG. 2).

Referring to FIGS. 1 to 3, the nesting auxiliary portion 1 has a female screw portion 1 ms and a nut portion 1 n. The female screw portion 1 ms is formed at a substantially central portion of the pedestal 11 (see FIG. 3). The nut portion 1n is formed on the outer periphery of the pedestal 11. The nut portion 1n can be gripped by using the insulating operation rod 9 having a pair of gripping arms 9a and 9b that open and close at the tip portion (see FIGS. 5 to 7).

Referring to FIGS. 1 to 3, the transformer mounting portion 2 further includes a bolt member 2b. The bolt member 2b rotatably connects the base end portions of the pair of engaging arms 21 and 21 having a V-shaped opening angle to one end portion side. Further, the bolt member 2b has a male threaded portion 2fs that can be screwed with the female threaded portion 1 ms on the other end side (see FIG. 3).

Referring to FIGS. 1 to 3, the transformer mounting portion 2 forms a hook piece 2h on the tip end side of the pair of engaging arms 21 and 21. On the other hand, the nut portion 1n has an introduction opening 1h of a truncated cone (see FIG. 1). The introduction opening 1h communicates with the female thread portion 1ms (see FIG. 3). Further, the base end portions of the pair of engaging arms 21 and 21 can be introduced into the introduction opening 1h.

With reference to FIGS. 1 to 3, when the nut portion 1n is rotated in one direction with respect to the bolt member 2b, the base end portions of the pair of engaging arms 21 and 21 are introduced into the introduction opening 1h. A pair of hook pieces 2h and 2h can move in a direction approaching each other. Then, the nesting aid 10 can be fixed to the upper part of the transformer T (see FIG. 1 or 2).

On the other hand, referring to FIGS. 1 to 3, when the nut portion 1n is rotated in the other direction with respect to the bolt member 2b, the base end portions of the pair of engaging arms 21 and 21 are separated from the introduction opening 1h. , A pair of hook pieces 2h and 2h can move in a direction away from each other. Then, the nesting aid 10 can be removed from the upper part of the transformer T (see FIG. 1 or 2).

Referring to FIGS. 1 to 3, in the nesting assisting tool 10 according to the embodiment, when the pedestal 11 is rotated in one direction with respect to the bolt member 2b, the base end portions of the pair of engaging arms 21 and 21 become the pedestal 11. By being introduced into the introduction opening 1h of the formed truncated cone, the pair of hook pieces 2h and 2h can move in the direction of approaching each other, so that the nesting aid 10 can be easily installed in the transformer T.

(Structure of nesting assistance part)
Next, the configuration of the nesting assisting unit 1 according to the embodiment will be described. With reference to FIG. 1 or FIGS. 2 and 4, the nesting assisting unit 1 includes a plurality of fixtures 13 and the same number of movers 14 as the fixtures 13. The fixture 13 is fixed to the middle portion of the branch rod 12. Further, the fixture 13 has a first universal joint 13j formed on the outer periphery thereof.

Referring to FIG. 1 or FIGS. 2 and 4, the moving tool 14 is slidably connected to the branch bar 12 in a state of being arranged between the fixing tool 13 and the base end portion of the branch bar 12. Further, the moving tool 14 has a second universal joint 14j formed on the outer periphery thereof.

Referring to FIG. 1 or FIGS. 2 and 4, the nesting assisting portion 1 includes the same number of connecting rods 15 as the fixture 13 and the moving tool 14. The connecting rod 15 has a spherical first joint tool 151 rotatably connected to the first universal joint 13j at one end. Further, the connecting rod 15 has a second joint tool 152 rotatably connected to the second universal joint 14j of the adjacent branch rod 12 at the other end.

With reference to FIG. 4C or FIG. 4D, when the moving tool 14 is moved toward the fixing tool 13 of the adjacent branch bar 12, a virtual circle connecting the tip edges of the plurality of branch bars 12 is connected. The circumference Cv is enlarged (see FIG. 4 (D)).

On the other hand, referring to FIG. 4A or FIG. 4B, when the moving tool 14 moves toward the base end side of the adjacent branch bar 12, the tip edges of the plurality of branch bars 12 are connected. The diameter of the virtual circumference Cv is reduced (see FIG. 4 (B)).

With reference to FIGS. 1 to 4, when the nesting auxiliary part 1 is opened (see FIG. 4C or FIG. 4D), the nesting of birds can be attracted to the transformer T side, whereby the arm A Nesting can be avoided (see FIG. 9). On the other hand, when the nesting assistance part 1 is closed (see FIG. 4A or FIG. 4B), the nesting assistance part 1 can be made compact and can easily pass between a set of edge lines We and We. It is also convenient for transportation.

(Structure of fixing means)
Next, the configuration of the fixing means 3 according to the embodiment will be described. Referring to FIGS. 1 to 4, the nesting auxiliary portion 1 further includes a fixing means 3 for fixing the bolt member 2b to the pedestal 11.

Referring to FIG. 1, the fixing means 3 includes a block-shaped main body 31, an engaging pin 32, and a compression coil spring 33. The main body 31 projects from the outer peripheral surface of the pedestal 11. Further, the main body 31 has a hole portion 31h opened on the inner peripheral surface of the female screw portion 1 ms.

Referring to FIG. 1, the engaging pin 32 is composed of a shaft portion 32s and a flange portion 32f. The shaft portion 32s is housed inside the cylindrical main body 31. The tip of the shaft portion 32s projects from the inner wall of the hole portion 31h to the inside of the female screw portion 1ms. The flange portion 32f is in contact with the upper end edge of the main body 31.

Referring to FIG. 1, the compression coil spring 33 winds around the outer circumference of the shaft portion 32s. Further, the compression coil spring 33 is housed inside the main body 31. One end of the compression coil spring 33 is fixed to the shaft portion 32s. The other end of the compression coil spring 33 is fixed to the inner wall of the main body 31. The compression coil spring 33 urges the tip of the shaft portion 32s to protrude from the inner wall of the hole portion 31h.

With reference to FIG. 1, when the flange portion 32f is gripped and the engagement pin 32 is pulled up against the urging force of the compression coil spring 33, the bolt member 2b rotates relative to the female screw portion 1 ms. it can. On the other hand, when the flange portion 32f is released, the tip end portion of the engaging pin 32 can be brought into contact with the bolt member 2b from a surface opposite to the outer peripheral surface of the pedestal 11. As a result, the bolt member 2b can be fixed to the female screw portion 1 ms.

[Action of bird nesting aids for transformers]
Next, the action and effect of the nesting aid 10 according to the embodiment will be described. Referring to FIGS. 1 to 3, in the nesting assisting tool 10 according to the embodiment, when the pedestal 11 is rotated in one direction with respect to the bolt member 2b, the base ends of the pair of engaging arms 21 and 21 become the pedestal 11. By being introduced into the introduction opening 1h of the formed truncated cone, the pair of hook pieces 2h and 2h can move in the direction of approaching each other, so that the nesting aid 10 can be easily installed in the transformer T.

When the nesting assistance unit 1 is opened (see FIG. 4C or 4D) with reference to FIGS. 1 to 4, the nesting of birds can be attracted to the transformer T side (see FIG. 9). As a result, nesting on the arm A can be avoided (see FIG. 9). On the other hand, when the nesting assistance part 1 is closed (see FIG. 4A or FIG. 4B), the nesting assistance part 1 can be made compact and can easily pass between a set of edge lines We and We. It is also convenient for transportation.

With reference to FIG. 1, when the flange portion 32f is gripped and the engagement pin 32 is pulled up against the urging force of the compression coil spring 33, the bolt member 2b rotates relative to the female screw portion 1 ms. it can. On the other hand, when the flange portion 32f is released, the tip end portion of the engaging pin 32 can be brought into contact with the bolt member 2b from a surface opposite to the outer peripheral surface of the pedestal 11. As a result, the bolt member 2b can be fixed to the female screw portion 1 ms.

Referring to FIGS. 1 to 4, the nesting assisting tool 10 according to the embodiment can separate the nesting assisting part 1 from the transformer mounting part 2. Therefore, after the chicks have left the nesting part 1, the bird's nest Can be easily removed.

The bird nesting aid for transformers according to the present invention can be expected to have the following effects.
(1) It is not necessary to install a large number of bird damage prevention devices near the arm.
(2) The risk of ground faults and short circuits during the installation work of the bird damage preventer can be reduced.
(3) It is possible to guide nesting to a relatively safe transformer.
(4) Nesting can be easily removed and nesting aids can be reattached.

1 Nesting aid 1h Introductory opening 1ms Female screw 1n Nut 2 Transformer mounting 2b Bolt member 2fs Male screw 2h Hook piece 9 Insulation operation rod 9a / 9b Pair of gripping arms 10 Nesting aid (bird nesting aid for transformer)
11 Pedestal 12 Branch bar 21.21 Pair of engaging arms T Transformer

Claims (4)

A nesting auxiliary part having a plurality of branch rods extending radially from the pedestal and rotatably connecting the base end portions of these branch rods to the pedestal.
A transformer mounting part having a pair of facing engaging arms that can be attached to and detached from the upper part of the transformer is provided.
The nesting assistance part
The female screw portion formed at the substantially central portion of the pedestal and the female screw portion
It has a nut portion formed on the outer circumference of the pedestal and which can be gripped by an insulating operation rod having a pair of gripping arms that open and close at the tip portion.
The transformer mounting part is
A bolt member in which the base end portions of the pair of engaging arms having a V-shaped opening are rotatably connected to one end side and a male screw portion capable of being screwed with the female screw portion is formed on the other end side.
It has a hook piece formed on the tip end side of the pair of the engaging arms and can be sandwiched from the outer peripheral direction on the upper part of the transformer.
The nut portion has an introduction opening of a truncated cone that communicates with the female thread portion and can introduce a base end portion of the pair of engaging arms.
When the nut portion is rotated in one direction with respect to the bolt member, the base end portions of the pair of engaging arms are introduced into the introduction opening, so that the pair of hook pieces can move in a direction approaching each other. ,
When the nut portion is rotated in the other direction with respect to the bolt member, the base end portions of the pair of engaging arms are separated from the introduction opening, so that the pair of hook pieces can move in a direction away from each other. Bird nesting aid for transformers. The nesting assistance part
A fixture fixed to the middle part of the branch rod and a first universal joint formed on the outer circumference.
A moving tool that is slidably connected to the branch bar and has a second universal joint formed on the outer circumference in a state of being arranged between the fixing tool and the base end portion of the branch bar.
A plurality of joints having a first joint rotatably connected to the first universal joint at one end and a second joint rotatably connected to the second universal joint of the adjacent branch rod at the other end. With a connecting rod,
In a state where the moving tool is moved toward the fixing tool of the adjacent branch bar, the diameter of the virtual circumference connecting the tip edges of the plurality of branch bars is expanded.
The bird nest for a transformer according to claim 1, wherein when the moving tool is moved toward the base end side of the adjacent branch bar, the diameter of the virtual circumference connecting the tip edges of the plurality of branch bars is reduced. Auxiliary tool. The bird nesting assisting tool for a transformer according to claim 1 or 2, wherein the nesting assisting portion further includes a fixing means for fixing a bolt member to the pedestal. The fixing means
A block-shaped main body having a hole opened in the inner peripheral surface of the female screw portion and protruding from the outer peripheral surface of the pedestal.
An engaging pin that can project the tip portion from the inner wall of the hole portion and abuts on the bolt member from a surface opposite to the outer peripheral surface of the pedestal.
The bird nesting aid for a transformer according to claim 3, further comprising a compression coil spring held inside the main body and forcing the engaging pin toward the bolt member.

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