JP7172738B2 - Bird damage prevention tool - Google Patents

Description

The present invention relates to a bird damage prevention device. In particular, the present invention relates to the structure of a bird damage prevention device that prevents birds such as crows and pigeons from nesting on utility poles.

When birds such as crows build nests on facilities installed on utility poles, there is concern that power outages will occur due to the nests. For example, when birds bring wires and the like to utility poles to build their nests, there is a concern that the wires may come into contact with the wires and cause a short circuit.

In order to prevent such bird damage, there is known a bird damage preventive device that prevents birds from flying and nesting by attaching a nest preventive device with an umbrella-like framework to a cross arm installed on a utility pole.

An umbrella-shaped bird damage prevention device according to the prior art includes a main shaft member arranged vertically, and a plurality of branches whose base ends are fixed to the outer circumference of the main shaft member and extend radially around the main shaft member in a downwardly inclined state. It consists of sticks. On the other hand, the space on the utility pole in which birds can nest differs depending on the mounting condition of cross arms and the presence or absence of switches or transformers. For this reason, there is a concern that bird damage preventive devices according to the prior art cannot effectively prevent bird damage because nesting spaces remain depending on the state of the utility pole arrangement.

In view of the above problems, conventional bird damage preventive tools have been designed to respond to the installation conditions of utility poles so that branch rods can be freely extended in the required space to ensure that birds do not fly in and nest. A device for preventing bird damage has been disclosed (see Patent Document 1, for example).

Japanese Patent Application Laid-Open No. 2005-110571

FIG. 10 is a perspective view showing a mounting state of a bird damage prevention device according to the prior art. Note that FIG. 10 of the present application corresponds to FIG. 9 of Patent Document 1. FIG.

Referring to FIG. 10, a utility pole P has a pair of arms A and A fixed horizontally on its top. The strap St is fixed to the cross arm A via the pin insulator Pi. A pair of tension insulators Si and Si are arranged on both sides of a pair of arms A and A. A pair of tension insulators Si and Si are oscillatably connected to each other. One tension insulator Si is connected to a cross arm A via a strap St. The other tension insulator Si pivotably connects the anchor clamp Ci.

Referring to FIG. 10, the anchor clamp Ci is covered with an insulating cover. The anchor clamp Ci clamps an overhead distribution line (hereinafter referred to as "wire") W inside thereof. The anchoring pole shown in FIG. 10 supports the electric wire W on the electric pole P by attaching the tension insulator Si connected to the anchoring clamp Ci that clamps the electric wire W to the cross arm A supported on the electric pole P. A wire W is laid between a pair of anchor clamps Ci and Ci without tension. A portion of the electric wire W that bypasses the utility pole P is called an edge line We, for example. Although the edge line We is not illustrated in Patent Document 1, the edge line We is provided in most cases.

Referring to FIG. 10, the bird damage prevention device 9 includes a main shaft member 91 arranged in a vertical state, a plurality of branch members 92 connected in the axial direction of the main shaft member 91, and a state inclined downward from the branch members 92. and has a branch rod 93 fixed to a branch member 92 at its proximal end.

Referring to FIG. 10, a bird damage prevention device 9 is fixed to the cross arm A via a cross arm fitting Br. The main shaft member 91 can be arranged vertically by inserting the lower end of the main shaft member 91 into the cylindrical portion provided on the tip end side of the arm fitting Br. Also, by arranging the plurality of branch rods 93 radially, it is possible to prevent birds from flying and nesting. Since the branch rod 93 is supported in a downwardly inclined state, even if a wire or the like for building a nest is brought in, the wire falls along the inclination, making it difficult to build the nest.

Referring to FIG. 10, the bird damage prevention tool 9 according to Patent Document 1 can easily cut the branch rod 93 to an appropriate length using a cutter. In addition, the plurality of branch rods 93 can be freely extended in a space on the utility pole P where there is a risk of nesting.

The bird damage preventive device 9 according to Patent Document 1 is fixed to the cross arm fitting Br by lowering the bird damage preventive device 9 from above the cross arm A. It is easier to work by lifting the This is the same for existing nest guards with an umbrella-shaped framework.

However, when the bird damage prevention device is lifted from below the cross arm, it must pass between a pair of edge lines We, We, and a plurality of radially spreading branch rods interfere with the pair of edge lines. There is a problem that it is difficult to pass between We and We.

If an attempt is made to forcibly pass the bird damage prevention device between a pair of edge lines We, it is necessary to cover the edge lines We with protective equipment such as an insulating sheet in advance, which increases the number of work processes. be. There is a need for a bird deterrent that can be easily passed between a pair of edge lines. And the above can be said to be the subject of the present invention.

The present invention has been made in view of such problems, and it is possible to easily pass between a pair of edge lines, and after passing between a pair of edge lines, birds build a nest on the utility pole. To provide a bird damage preventive tool for preventing

The present inventor has proposed a main shaft member extending straight, a protector main body having a plurality of bendable branch rods arranged in multiple stages in the axial direction of the main shaft member and protruding radially from the outer circumference of the main shaft member, and the main shaft member. A cross arm mounting tool having a regulation hole opened freely to be introduced from the tip part on the tip part side of a pair of clamping pieces constitutes a bird damage prevention tool, and the bird damage prevention tool is passed between a pair of edge lines. When multiple branch rods are passed through the regulation hole, the virtual circumference connecting the tip edges of the multiple branch rods is reduced in diameter, and after the multiple branch rods pass through the regulation hole, the multiple branch rods By expanding the diameter of the imaginary circumference connecting the tip edge, the bird damage preventive device can be installed on the cross arm. Based on this idea, the following new bird damage preventive device was invented.

(1) The device for preventing bird damage according to the present invention includes a main shaft member extending straight and arranged in multiple stages at regular intervals in the axial direction of the main shaft member. a main body having a plurality of bendable branch rods projecting radially in a state, a pair of clamping pieces arranged substantially parallel to each other, and a connecting piece connecting the base ends of the pair of clamping pieces to each other. and a cross arm attachment for introducing and holding the cross arm from the distal end side of the pair of clamping pieces, wherein the cross arm attachment includes the base end sides of the plurality of branch rods. A regulation hole is provided on the distal end side of the pair of clamping pieces so that the main shaft member can be freely introduced from the distal end thereof. The diameter of the imaginary circumference connecting the branches is reduced, and after the plurality of branch rods pass through the regulation holes, the diameter of the virtual circumference connecting the tip edges of the plurality of branch rods is expanded.

(2) The preventer main body is arranged on the base end side of the main shaft member, and after passing through the regulation hole opened in the holding piece on the upper side, the imaginary circumference is expanded so that the main shaft member is removed. A plurality of non-return bars for preventing return are detachably fixed to the base end portion side of the main shaft member, and in cooperation with the plurality of non-return bars, the cross arm is attached while the main shaft member is in an upright state. and a fastener for holding to the tool.

(3) It is preferable that the cross arm mounting member is arranged in a state of being inclined inward from the outer surface of the clamping piece, and that the clamping piece is provided with one or more lances that prevent it from coming off the cross arm. .

(4) The cross arm attachment further has a gripping portion that can be gripped by an insulated operating rod for indirect hot wire construction, and the gripping portion has a base end edge that can be freely rotated to the bottom of the gripping piece on the lower side. It preferably comprises a movable gripping plate connected to the .

(5) The movable gripping plate has an elongated hole in the center thereof for preventing the nut member screwed onto the base end of the main shaft member from falling off. preferably.

A bird damage prevention device according to the present invention comprises a main shaft member arranged in multiple stages in the axial direction of a straightly extending main shaft member and having a plurality of bendable branch rods projecting radially from the outer periphery of the main shaft member. and a cross arm mounting device having a regulation hole on the tip end side of the pair of clamping pieces that is freely introduced from the part, and when the bird damage prevention device is passed between the pair of edge lines, a plurality of branches Pass the rod through the regulation hole to reduce the diameter of the imaginary circumference that connects the tip edges of the multiple branch rods. By expanding the diameter of the circumference, the bird damage prevention device can be easily installed on the cross arm.

1 is a perspective view showing the configuration of a bird damage prevention tool according to an embodiment of the present invention; FIG. FIG. 4 is an enlarged perspective view of a preventive device body provided in the bird damage preventive device according to the embodiment; Fig. 3(A) is a right side view of the arm attachment provided in the bird protection device according to the embodiment, and Fig. 3(B) is a view showing the configuration of the arm attachment; 3(C) is a rear view of FIG. 3(A), and FIG. 3(D) is a bottom view of FIG. 3(A). FIG. 4 is a right side view showing the configuration of the bird damage prevention device according to the embodiment, and is a state diagram showing the bird damage prevention device mounted on a cross arm. FIG. 4 is a view showing a usage state of a cross arm attachment included in the bird protection device according to the embodiment, and is a state diagram before the cross arm attachment is attached to the cross arm. FIG. 4 is a diagram showing a usage state of a cross arm attachment provided in the bird damage prevention device according to the embodiment, and is a diagram showing a state in which the cross arm attachment is attached to an end portion of the cross arm. FIG. 4 is a view showing the usage state of the bird damage prevention device according to the embodiment, and is a state diagram before inserting the prevention device main body into the regulation hole from below the arm attachment. FIG. 4 is a front view showing the configuration of an insulated operating rod for operating the bird damage prevention device according to the present invention; FIG. 9 is an enlarged front view of the main part of FIG. 8; FIG. 10 is a perspective view showing a mounting state of a bird damage prevention device according to the prior art;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

Before describing the configuration of the bird damage prevention device for cross arm according to the present invention, the configuration of an insulated operating rod for operating the bird damage prevention device according to the present invention will be described.

(Configuration of insulated operating rod)
8 or 9, the insulated operating rod 5 is composed of an elongated operating rod 51 and a tool portion 52. As shown in FIG. The insulating operating rod 5 also has an operating rod 53 . The tool portion 52 is attached to the tip portion of the operating rod 51 .

Referring to FIG. 8 or 9, the tool portion 52 comprises a pair of curved gripping arms 5a and 5b that open and close. One of the gripping arms 5a is a fixed arm with a base end fixed, and the other gripping arm 5b rotates around a rotating shaft 5c provided at the base end of the one gripping arm 5a. It has a movable arm.

Referring to FIG. 8, an operating rod 53 is held along the operating rod 51. As shown in FIG. The tip of the operating rod 53 is rotatably connected to the other gripping arm 5b. By operating the operating lever 54 provided at the proximal end of the operating rod 53, the gripping arm 5b can be opened and closed with respect to the gripping arm 5a. The insulated operating rod 5 is made of a plastic pipe or the like having insulating properties in the intermediate portions of the operating rod 51 and the operating rod 53, and ensures insulation suitable for the indirect live wire construction method.

Referring to FIG. 8, gripping the operating lever 54 and bringing the operating lever 54 closer to the operating rod 51 allows the other gripping arm 5b to be closed with respect to the one gripping arm 5a. When the operating lever 54 is released, the force of a spring (not shown) connected to the operating lever 54 can open one gripping arm 5a with respect to the other gripping arm 5b. FIG. 8 or 9 shows a state in which the other gripping arm 5b is opened to the maximum with respect to the gripping arm 5a.

Referring to FIG. 8 or 9, one gripping arm 5a protrudes a tapered gripping claw 51a. The gripping claws 51a form a gripping surface 50a. The gripping surface 50a is formed substantially parallel along the centrifugal direction from the center of rotation of the rotating shaft 5c. Similarly, the other gripping arm 5b protrudes a tapered gripping claw 51b. The gripping claws 51b form a gripping surface 50b. The gripping surface 50b is arranged with a predetermined open angle from the gripping surface 50a. Referring to FIG. 8 or 9, when the operating lever 54 is gripped, the gripping surface 50b can be brought closer to the gripping surface 50a.

The insulated operating rod 5 shown in FIG. 8 or 9 is a so-called "insulated manipulator" capable of gripping a high-voltage distribution line or the like placed at a high place with a pair of gripping claws 51a and 51b.

[Configuration of bird damage prevention tool]
(overall structure)
Next, the configuration of the bird damage prevention device according to one embodiment of the present invention will be described. 1 to 4, a bird protection device 10 according to one embodiment of the present invention can be attached to a cross arm A. As shown in FIG. The cross arm A is mounted on the utility pole P in a substantially horizontal state (see FIG. 10).

Referring to FIGS. 1 to 4, the bird protection device 10 comprises a protection device main body 1 and a cross arm attachment 2. As shown in FIG. The preventive device main body 1 includes a straightly extending main shaft member 11 and a plurality of bendable branch rods 12 .

1 or 2 and 4, the plurality of branch rods 12 are arranged in multiple stages from the distal end side to the proximal end side of the main shaft member 11 at regular intervals in the axial direction of the main shaft member 11. are placed in These branch rods 12 radially protrude from the outer circumference of the main shaft member 11 . Further, these branch rods 12 protrude from the outer periphery of the main shaft member 11 with their distal ends inclined downward.

Referring to FIG. 1 or FIGS. 3 and 4, the arm fitting 2 has a pair of clamping pieces 2t and 2u and a connecting piece 2c. The pair of clamping pieces 2t and 2u are arranged substantially parallel. The connecting piece 2c connects the base ends of the pair of clamping pieces 2t and 2u. The cross arm fitting 2 can hold the cross arm A by introducing it into the interior from the tip end portions of the pair of clamping pieces 2t and 2u.

Referring to FIG. 1 or FIGS. 3 and 4, the arm fitting 2 has a regulation hole 2h that opens at the tip end side of the pair of clamping pieces 2t and 2u (see FIG. 3). The main shaft member 11 including the proximal end sides of the plurality of branch rods 12 can be introduced from the distal end into these regulation holes 2h (see FIG. 7).

Referring to FIG. 7, while the plurality of branch rods 12 are passing through the regulation hole 2h, the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 can be reduced in diameter. 1 or 4, after the plurality of branch rods 12 pass through the regulation hole 2h (see FIG. 7), the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 can be expanded.

In the bird damage prevention device 10 according to the embodiment, when the bird damage prevention device 10 is passed between a pair of edge lines We and We (see FIG. 10), the plurality of branch rods 12 are passed through the regulation holes 2h. , the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 is reduced in diameter, and after the plurality of branch rods 12 pass through the regulation hole 2h, the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 By expanding the diameter of the cross arm A, the bird damage prevention tool 10 can be easily installed on the cross arm A.

(Structure of protector body)
Next, the configuration of the protector main body 1 according to the embodiment will be described. 1 or 2 and 4, the protector body 1 further includes a hemispherical cap member 13, a plurality of bendable non-return bars 14, and a nut member 15 as a fastener.

(Structure of cap member)
1 or 2 and 4, the cap member 13 can be detachably fixed to the distal end surface of the main shaft member 11. As shown in FIG. Referring to FIG. 2, the cap member 13 has a male threaded portion 13m protruding from the bottom. On the other hand, referring to FIG. 2, the main shaft member 11 has a female threaded portion 11f screwed onto the distal end surface thereof to be screwed with the male threaded portion 13m.

1 or 4, the outer diameter of the cap member 13 is formed slightly larger than the outer diameter of the main shaft member 11 including the base ends of the plurality of branch rods 12. As shown in FIG. By fixing the cap member 13 to the tip of the main shaft member 11, the main shaft member 11 can be easily introduced from the tip (see FIG. 7).

(Structure of main shaft member)
1 or 2 and 4, the main shaft member 11 is preferably made of insulating synthetic resin. A cylindrical main shaft member 11 can be obtained by molding an insulating synthetic resin.

Referring to FIG. 2, the main shaft member 11 is formed with eight grooves 11d that are arcuately drilled from the outer periphery. These grooves 11d are bored from the tip edge of the main shaft member 11 to the base end side. The proximal ends of the branch rods 12 are fixed to these grooves 11d using joining means such as adhesion.

(Structure of branch bar)
Referring to FIG. 1 or 2 and 4, the branch rod 12 is preferably made of insulating synthetic resin. The bent branch rod 12 can be obtained by molding an insulating synthetic resin.

Referring to FIG. 1 or 2 and 4, the plurality of branch rods 12 extend crosswise at their distal ends. In the embodiment, the plurality of branch rods 12 are arranged in three stages in the axial direction of the main shaft member 11 . As for the plurality of branch rods 12, the plurality of branch rods 12 in the upper stage and the plurality of branch rods 12 in the middle stage are displaced by approximately 45 degrees in plan view. The plurality of branch rods 12 in the middle stage and the plurality of branch rods 12 in the lower stage are arranged in the same manner in plan view. That is, the plurality of branch rods 12 are arranged in a state of being divided into eight equal parts in a plan view.

(Structure of non-return bar)
1 or 2 and 4, the plurality of non-return bars 14 are fixed to the main shaft member 11 at their base end sides with their base end sides fitted in the grooves 11d. A plurality of check bars 14 protrude radially from the outer circumference of the main shaft member 11 . Moreover, these non-return bars 14 protrude from the outer periphery of the main shaft member 11 with their distal ends inclined downward.

Referring to FIG. 7, after the main shaft member 11 is introduced into the regulation hole 2h from its tip portion and the plurality of non-return rods 14 have passed through the regulation hole 2h, the plurality of non-return rods 14 are elastically restored and the plurality of non-return rods 14 , the virtual circumference connecting the tip edges of the non-return rods 14 can be expanded. A plurality of non-return bars 14 abut on the periphery of the regulation hole 2h to prevent the return of the main shaft member 11 (see FIG. 1 or FIG. 4).

(Configuration of nut member)
2 or 4, the nut member 15 can be detachably fixed to the base end portion side of the main shaft member 11. As shown in FIG. The main shaft member 11 has a male threaded portion 11m formed on the base end side. The nut member 15 is fastened to the male threaded portion 11m so that the main shaft member 11 can be stopped at a predetermined position.

Referring to FIG. 7, when the main shaft member 11 is introduced into the regulation hole 2h from its tip portion, the nut member 15 can abut on the holding piece 2u on the lower side from the bottom side. The nut member 15 cooperates with a plurality of non-return bars 14 to hold the main shaft member 11 in an upright state on the arm fitting 2 (see FIG. 1 or FIG. 4).

(Structure of arm attachment)
Next, the configuration of the arm fitting 2 according to the embodiment will be described. Referring to FIG. 1 or FIGS. 3 and 4, the arm fitting 2 has a pair of lances 2r, 2r on a pair of clamping pieces 2t, 2u.

(Configuration of lance)
Referring to FIG. 3, one of the lances 2r, 2r is arranged in an inclined state inside the cross arm attachment 2 from the outer surface of the clamping piece 2t on the upper side. The other lances 2r, 2r are arranged in an inclined state inside the cross arm attachment 2 from the outer surface of the clamping piece 2u on the lower side.

5 and 6, when the cross arm A is relatively introduced into the cross arm attachment 2 from the opening side of the cross arm attachment 2, the pair of opposing lances 2r, 2r are spread apart. can be done. When the cross arm A is in contact with the inner wall of the connecting piece 2c, the pair of lances 2r and 2r are elastically restored so that the tip edges of the pair of lances 2r and 2r can face the arm A. . As a result, the one-to-one pair of lances 2r, 2r can be prevented from coming off from the cross arm A.

(Structure of gripping portion)
Referring to FIG. 1 or FIGS. 3 and 4, the arm fitting 2 has a gripping portion 21 protruding from the bottom of the clamping piece 2u on the lower side. The gripping portion 21 can be gripped by a pair of gripping arms 5a and 5b provided on the tool portion 52 of the insulated operating rod 5 for indirect hot wire construction (see FIG. 8 or 9). The gripping portion 21 is composed of a movable gripping plate whose proximal edge is rotatably connected to the lower gripping piece 2u by a hinge 21h.

Referring to FIG. 3(C), the grip portion 21 has an elongated hole 211 opened in the central portion. 4, when gripping portion 21 is rotated clockwise, male threaded portion 11m of main shaft member 11 can be introduced into slot 211 from the distal end portion (see FIG. 1). The hinge 21h is tightened so that the posture of the grip portion 21 can be maintained.

1 or 3 and 4, the gripping portion 21 has an elongated hole 211 that can be engaged with the male threaded portion 11m of the main shaft member 11, so that an existing cap for preventing the nut from coming off (not shown) can be used. It is possible to prevent the nut member 15 from coming off without using

[Function of bird damage prevention tool]
Next, the operation and effects of the bird damage prevention device 10 will be described while explaining the operation procedure of the bird damage prevention device 10 according to the embodiment.

First, referring to FIG. 5, the gripping portion 21 is gripped by a pair of gripping arms 5a and 5b (see FIG. 8 or 9), and the opening side of the arm attachment 2 and one side of the arm A are held together. Place them facing each other. Next, the cross arm fitting 2 is moved toward the cross arm A while gripping the grip portion 21 with the pair of grip arms 5a and 5b. In the state shown in FIG. 6, the cross arm A is relatively introduced to the opening side of the cross arm attachment 2. As shown in FIG.

Next, from the state shown in FIG. 6, by moving the arm fitting 2 to the left with respect to the arm A, the arm A can be moved relatively to the inner part of the arm fitting 2 ( See Figure 7). In the state shown in FIG. 7, one pair of lances 2r, 2r prevent the cross arm A from coming off.

Next, referring to FIG. 7, a pair of gripping arms 5a and 5b (see FIG. 8 or 9) grip the base end of the main shaft member 11, and the main shaft including the base end sides of the plurality of branch rods 12 is gripped. The member 11 is introduced into the regulation hole 2h from the tip. In this case, it is preferable to rotate the gripping portion 21 counterclockwise using a pair of gripping arms 5a and 5b (see FIG. 8 or 9) to retract it (see FIG. 7).

Next, referring to FIG. 1 or FIG. 4, a plurality of non-return bars 14 are brought into contact with the periphery of the regulation hole 2h to prevent return of the main shaft member 11, and the nut member 15 is positioned on the bottom side of the clamping piece 2u. 1 or 4, the main shaft member 11 can be held in an upright state by the arm attachment 2 in cooperation with the plurality of non-return bars 14. As shown in FIG.

Next, referring to FIG. 4, by rotating the gripping portion 21 clockwise using a pair of gripping arms 5a and 5b (see FIG. 8 or 9), the male screw portion 11m of the main shaft member 11 is rotated. By engaging the long hole 211 (see FIG. 1), the nut member 15 can be prevented from coming off. Then, the series of operating procedures is terminated.

In the bird damage prevention device 10 according to the embodiment, when the bird damage prevention device 10 is passed between a pair of edge lines We and We (see FIG. 10), the plurality of branch rods 12 are passed through the regulation holes 2h. , the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 is reduced in diameter, and after the plurality of branch rods 12 pass through the regulation hole 2h, the virtual circumference Cv connecting the tip edges of the plurality of branch rods 12 By expanding the diameter of the cross arm A, the bird damage prevention tool 10 can be easily installed on the cross arm A.

The bird damage prevention device 10 according to the embodiment includes a plurality of non-return bars 14 that expand the virtual circumference to prevent the return of the main shaft member 11 after passing through the regulation holes 2h opened in the clamping pieces 2t and 2u, Since the main shaft member 11 is provided with the nut member 15 that abuts on the clamping piece 2u in cooperation with the plurality of check bars 14, the main shaft member 11 can be easily held on the cross arm attachment 2 in an upright state.

The cross arm attachment 2 according to the embodiment is arranged in an inclined state from the outer surface of the clamping pieces 2t and 2u to the inside, and the clamping pieces 2t and 2u are provided with a plurality of lances 2r that prevent the clamping pieces 2t and 2u from falling off from the cross arm A. Therefore, falling off from the cross arm A can be prevented.

Since the gripping portion 21 according to the embodiment protrudes from the lower portion of the cross arm attachment 2, there is an effect that the insulating operating rod 5 can be easily approached from below.

Further, since the gripping portion 21 has an elongated hole 211 that can be engaged with the male threaded portion 11m of the main shaft member 11, the nut member 15 can be removed without using an existing cap (not shown) for preventing the nut from falling off. can be prevented.

The bird damage preventive tool according to the present invention can be expected to have the following effects.
(1) An umbrella-shaped bird damage prevention device can be easily attached to a cross arm by using an insulated operating rod for indirect hot-line work.
(2) The work place for installing the bird damage prevention device does not go higher than the high voltage line.
(3) It is possible to lower the work position with the bucket of the vehicle for work at height.
(4) Workers do not have to worry about being electrocuted by carelessly touching a high-voltage wire.

1 prevention device body 2 cross arm mounting device 2c connecting piece 2h regulation hole 2t 2u pair of clamping pieces 10 bird damage prevention device 11 main shaft member 12 plural branch rods A cross arm Cv virtual circumference

Claims (5)

A main shaft member that extends straight, and a plurality of freely bendable branches arranged in multiple stages at regular intervals in the axial direction of the main shaft member and protruding radially from the outer periphery of the main shaft member in a state in which the tip portion side is inclined downward. a protector body having a rod;
It has a pair of clamping pieces arranged substantially in parallel and a connecting piece that connects the base ends of the pair of clamping pieces, and holds the cross arm by introducing it inside from the tip end side of the pair of clamping pieces. a bracket attachment for
The cross arm attachment has, on the tip end sides of the pair of clamping pieces, regulation holes that open so that the main shaft member including the base end sides of the plurality of branch rods can be freely introduced from the tip end,
while the plurality of branch rods are passing through the regulation holes, a virtual circumference connecting tip edges of the plurality of branch rods is reduced in diameter;
A bird damage prevention tool, wherein after the plurality of branch rods pass through the regulation hole, the virtual circumference connecting the tip edges of the plurality of branch rods is expanded in diameter. The preventive tool body is
A plurality of non-return bars arranged on the base end side of the main shaft member and for preventing the return of the main shaft member by increasing the diameter of the virtual circumference after passing through the regulation hole opened in the holding piece on the upper side. When,
a fastener that is detachably fixed to the base end of the main shaft member and cooperates with the plurality of non-return bars to hold the main shaft member in an upright state to the cross arm attachment. The bird damage prevention device according to claim 1, wherein 3. The clamping piece is provided with one or more lances for preventing the clamping piece from coming off from the clamping piece. Bird protection equipment as described. The cross arm attachment further has a grip portion that can be gripped by an insulated operating rod for indirect hot wire construction,
4. A bird damage prevention device according to claim 1, wherein said gripping portion comprises a movable gripping plate whose base edge is rotatably connected to the bottom of said clamping piece on the lower side. The movable gripping plate has an elongated hole in the center thereof for preventing the nut member screwed onto the base end of the main shaft member from falling off. 5. The bird damage prevention device according to claim 4.

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