JP5714661B2 - Insulation protective cover - Google Patents

Description

  The present invention relates to an insulating protective cover for preventing an electric shock accident or a ground fault accident by covering a charging part or a conductor adjacent to the charging part.

When performing electrical work close to the charging part of the electric circuit, electric shock due to contact with the charging part, ground faults due to conduction between the charging part and the conductor (for example, utility pole) through the work tool, etc. In order to prevent this, it is a common practice to protect the charging portion or the conductor portion close to the charging portion by covering with an insulating material.
As an example of the protective member, Patent Document 1 describes a wire protective sheet that is formed of an insulating material such as synthetic resin or rubber and can be folded and folded. The electric wire protection sheet has a bellows-like folded portion and is configured to be stretchable.
Patent Document 2 describes a strip-shaped wire protection member that is wound around an electric wire by internal residual stress. When the electric wire protection member is attached to the electric wire, the electric wire protection member is deformed into a cylindrical shape extending along the longitudinal direction of the electric wire.

JP 2012-161196 A JP 2000-67672 A

Since the insulating sheet employed in Patent Document 1 is made of a furoshiki-like flexible material, it is difficult to wrap and fix the insulating sheet around a large-diameter protective object such as a utility pole. When winding around an electric pole, it is necessary to make a round around the electric pole with an insulating sheet or a rubber string for fixing the insulating sheet to the electric pole. However, when working on an aerial work vehicle, the work position is restricted, and it is difficult to insulate and protect the utility pole by the above method.
Moreover, the electric wire protection member of patent document 2 is specialized in electric wire protection, and cannot insulate and protect other than electric wires.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sheet-like insulating protective cover that can be easily attached to a protective object such as a utility pole.

In order to solve the above-described problem, the invention according to claim 1 is a bi-stable spring that deforms mutually between an extended first stable posture and a second stable posture curled in a spring shape. And a flexible insulating sheet having a spring mounting portion for mounting the bistable spring.
In the invention of claim 1, the bistable spring can take two stable postures, ie, a stretched first stable posture and a second stable posture curled like a mainspring, and between each stable posture, Deform. The insulating sheet includes a spring mounting portion for mounting a bistable spring. Since the insulating sheet has flexibility, it is deformed according to the posture of the attached bistable spring. In other words, the insulating sheet takes an unfolded posture when the bistable spring takes the first stable posture, and takes a protective posture covering the object to be protected when the bistable spring takes the second stable posture.
The invention according to claim 2 is characterized in that the bistable spring is detachable from the insulating sheet.
According to the second aspect of the present invention, it is possible to protect an object to be protected using an insulating protective cover to which a bistable spring is attached, or to protect an object to be protected using an insulating protective cover to which no bistable spring is attached. You can also An insulating protective cover without a bistable spring can be used as a general insulating sheet.

The invention according to claim 3 is characterized in that a plurality of the bistable springs are arranged on the insulating sheet along the extension direction.
In the invention of claim 3, since the plurality of bistable springs are provided, the degree of adhesion of the insulating sheet to the object to be protected can be increased. In addition, since a plurality of bistable springs are arranged in parallel with each other along the extension direction, the bistable springs do not interfere with the deformation to the first or second stable posture and effectively protect the object to be protected. Insulate and protect.
According to a fourth aspect of the present invention, there is provided a shape holding member that extends along a direction intersecting with an extension direction of the bistable spring.
When a furoshiki-shaped sheet member generally used as an insulating sheet is employed, it may be difficult to maintain the entire insulating sheet in an expanded state with only a bistable spring. In the present invention, the shape holding member extending along the direction intersecting the extending direction of the bistable spring is provided. The shape holding member can hold the shape of the insulating sheet in an expanded state without inhibiting the deformation of the bistable spring to the first or second stable posture.

The invention according to claim 5 is characterized in that an anti-slip member is provided on the side facing the protective object.
According to the invention of claim 5, the displacement of the insulating sheet with respect to the protection object is prevented, and the protection object is effectively insulated and protected.
The invention described in claim 6 is characterized in that a handle that can be gripped by a tool for indirect hot wire method is provided on the non-facing surface side with respect to the object to be protected.
In the invention of claim 6, the insulating protective cover can be attached to and detached from the object to be protected by gripping the handle with the tool for indirect hot wire construction.

  The insulating protective cover is deformed according to the posture of the bistable spring, takes an expanded posture when the bistable spring takes the first stable posture, and protects when the bistable spring takes the second stable posture. Take a protective posture to cover the object. Since the insulation protection cover can be insulated and protected by bringing the insulation protection cover in the deployed position close to the protection object and deforming the bistable spring to the second stable posture, it is easy to attach the insulation protection cover to the protection object. is there.

It is a reverse view of the insulation protection cover which concerns on 1st embodiment of this invention. It is a perspective view which shows a bistable spring, (a) is a figure which shows the 1st stable attitude | position extended, (b) is a figure which shows the 2nd stable attitude | position curled in the shape of a mainspring. (A)-(c) is a figure which shows the other example of arrangement | positioning of a spring mounting part. (A) is a surface view of the insulation protection cover, (b) is a perspective view of the insulation protection cover observed from the front side, and (c) is a view of the insulation protection cover observed from the direction of arrow A in (b). is there. It is the schematic diagram which showed the use condition of the insulation protection cover, (a) is a figure which shows the unfolding attitude | position of an insulation protection cover, (b) is a figure which shows the protection attitude in which the insulation protection cover was wound around the utility pole. It is a reverse view of the insulation protection cover which concerns on 2nd embodiment of this invention. It is a figure which shows an example of a shape holding member, (a) is a top view, (b) is C arrow directional view of (a).

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .

[First embodiment]
An insulating protective cover according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a back view of the insulating protective cover according to the first embodiment of the present invention. FIG. 2 is a perspective view showing a bistable spring, (a) is a diagram showing a first stable posture extended, and (b) is a diagram showing a second stable posture curled in a spring shape. .

The insulating protective cover 1 according to this embodiment includes a plurality of bistable springs 10 that are deformed mutually between a stretched first stable posture and a second stable posture curled in a spring shape, and a plurality of bistables. And a flexible insulating sheet 20 including a plurality of spring mounting portions 21 for detachably mounting the springs 10.
The insulating protective cover 1 is wound around a flattened deployment position (see FIG. 5A) and a protection object (electric pole 110) according to the posture of the bistable spring 10 mounted inside the insulating sheet 20. Take two protective postures (see FIG. 5B). When the bistable spring 10 takes the first stable posture, the insulating protective cover 1 takes the deployed posture. When the bistable spring 10 takes the second stable posture, or in the process of shifting from the first stable posture to the second stable posture, the insulating protective cover 1 takes the protective posture. As described above, the insulating protective cover 1 according to the present invention is characterized in that it takes two postures by utilizing the force of the bistable spring.

The bistable spring 10 is a leaf spring having two stable postures, and is a first stable posture (FIG. 2 (a)) extended in the form of a long belt and a second stable posture (FIG. 2) curled in a spring shape. (B)). The second stable posture is a posture wrapped around the axis along the short direction of the bistable spring. In addition, when the bistable spring is in each stable posture, the posture is stably held unless an external force is applied.
The insulating sheet 20 is made of a flexible or flexible insulating sheet member such as synthetic resin or rubber. What is necessary is just to be able to deform | transform according to the attitude | position of the bistable spring 10. FIG. As the insulating sheet 20, a foldable rectangular / furoshiki-shaped insulating sheet generally used in the past can be used. The insulating sheet 20 shown in FIG. 1 has a rectangular shape, but may have other shapes such as a circular shape and a polygonal shape.
The insulating sheet 20 is provided with a spring mounting part 21 on which the bistable spring 10 is detachably mounted on the surface (inner surface, back surface) facing the object to be protected. In addition, a handle 27 that can be gripped by an indirect hot wire method tool (for example, an insulating YATCO) is provided on the non-facing surface side (outer surface, surface) of the insulating sheet 20 with the object to be protected (FIG. 5). 4, see FIG.

The spring mounting part will be described.
A plurality of the spring mounting portions 21 are disposed on the back surface (surface facing the protection target) of the insulating sheet 20. Each spring mounting portion 21 includes a bag-shaped spring accommodating portion 23 that accommodates one end in the longitudinal direction of the bistable spring 10 and a pressing piece that presses the other end in the longitudinal direction of the bistable spring 10 exposed from the spring accommodating portion 23. 25. The spring mounting portion 21 may be disposed on the surface side of the insulating sheet 20.
In the following description, for the sake of convenience, the direction of the insulating sheet along the longitudinal direction of the bistable spring (left-right direction in the figure) is expressed as the “width direction” and the direction of the insulating sheet along the short direction of the bistable spring. (Up and down direction in the figure) is expressed as “height direction”.

The spring accommodating portion 23 surrounds one end in the longitudinal direction of the flat band-shaped bistable spring 10 with the insulating sheet. While one end side in the longitudinal direction of the spring accommodating portion 23 is closed, an opening 23a is formed on the other end side in the longitudinal direction. The opening 23a is for inserting the bistable spring 10 into the spring accommodating portion 23 from one end in the longitudinal direction.
The spring accommodating portion 23 is formed by joining three sides of a rectangular sheet material made of the same material as the insulating sheet 20 to the insulating sheet 20. As a joining method, stitching, adhesion, welding or the like can be used.

The pressing piece 25 is disposed adjacent to the opening 23 a of the spring accommodating portion 23. The holding piece 25 is disposed across the bistable spring 10 in the short direction. The pressing piece 25 prevents the bistable spring 10 from falling off by pressing the other end in the longitudinal direction of the bistable spring 10 inserted into the spring accommodating portion 23 against the back surface of the insulating sheet 20.
The pressing piece 25 is made of the same material as the insulating sheet 20, and one end 25 a of the pressing piece 25 is joined to the insulating sheet 20. As a joining method, stitching, adhesion, welding, or the like can be used. A hook-and-loop fastener 25 b that is freely attached to and detached from a hook-and-loop fastener (not shown) provided on the insulating sheet 20 is provided at the other end of the pressing piece 25. The pressing piece 25 freely opens and closes along the short direction of the spring accommodating portion 23.
A non-slip member (for example, rubber) that prevents the bistable spring 10 from moving in the longitudinal direction is provided on the contact surface of the holding piece 25 with the bistable spring 10 to prevent the bistable spring 10 from falling off. You may do it. Alternatively, the holding piece 25 may be formed in a bag shape that accommodates the other longitudinal end of the bistable spring 10 to prevent the bistable spring 10 from falling off.

The example of arrangement | positioning of a spring mounting part is demonstrated.
In the insulating protective cover shown in FIG. 1, a plurality of spring mounting portions 21 are arranged on the back surface of the insulating sheet 20. Each spring mounting portion 21 is arranged in parallel with the longitudinal direction thereof aligned. That is, the bistable springs attached to the insulating sheet 20 are arranged in parallel along the extension direction (longitudinal direction) of the bistable springs.
In the insulating protective cover 1 shown in FIG. 1, two spring mounting portions 21 are arranged in series, and three sets of spring mounting portions 21 arranged in series are arranged in parallel. The insulating protective cover 1 can be equipped with up to six bistable springs.
By arranging the spring mounting portions 21 in series, it is possible to use the bistable spring 10 that is shorter than the length of the insulating sheet 20 in the width direction. For example, when the utility pole 110 shown in FIG. 5 is a protection target, the length in the width direction of the insulating sheet 20 needs to be set to a length that can cover at least a half circumference of the utility pole. Even when the bistable spring 10 is shorter than the length of the insulating sheet 20 in the width direction, the bistable spring 10 can be disposed over the entire width of the insulating sheet 20 and effectively surrounds the utility pole. can do.

Further, by arranging the spring mounting portions 21 in parallel, for example, when the utility pole 110 shown in FIG. 5 is to be protected, the insulation protection cover can be brought into close contact with the utility pole at a plurality of locations along the axial direction of the utility pole. . Therefore, the adhesion of the insulating sheet to the object to be protected can be increased, and the insulation can be effectively protected.
Further, by configuring the bistable spring 10 so as to be detachable from the insulating sheet 20, the bistable spring can be selectively attached only to a portion necessary for winding the insulating protective cover 1 around the object to be protected. it can. For example, in FIG. 1, two bistable springs 10 may be mounted on the uppermost spring mounting portion 21, and the four spring mounting portions 21 positioned therebelow may be used without mounting the bistable springs. Is possible. In this case, the insulating protective cover 1 can be wound around the object to be protected using the deformation of the bistable spring to the second stable posture. In addition, for parts where the bistable spring is not mounted, the insulating protective cover can be freely deformed, so that a member protruding from the protection object (for example, a pin insulator mounted on the armrest of a utility pole) has its shape It is possible to use such as protection in accordance with.
Furthermore, by constructing the bistable spring 10 so as to be detachable from the insulating sheet 20, the object to be protected can be insulated and protected using the insulating protective cover 1 to which the bistable spring 10 is not attached. In this case, the insulating protective cover 1 can be used as a general insulating sheet.
In addition, when arrange | positioning the spring mounting part 21 in series like illustration, the fall of the bistable spring 10 can be prevented effectively by arrange | positioning the opening 23a of each spring accommodating part 23 mutually.

FIGS. 3A to 3C are diagrams showing another arrangement example of the spring mounting portion. In the insulating protective cover 1 shown in FIG. 3A, a plurality of spring mounting portions 21 are arranged alternately (in a staggered manner). In the insulating protective cover 1 shown in FIG. 1, a portion where the bistable spring 10 does not exist is generated in the central portion in the width direction of the insulating sheet 20, so that the insulating sheet 20 is folded in two in the central portion in the width direction. In this example, there is no place where the bistable spring 10 is interrupted in the width direction of the insulating sheet 20. Therefore, when protecting the utility pole 110 shown in FIG. 5 as a protection object, for example, the insulating protection cover 1 in the deployed posture (see FIG. 5A) is not bent at the center in the width direction. Mounting to the utility pole 110 becomes easy.
The spring mounting portions 21 are not necessarily arranged in parallel to each other. For example, as shown in FIG. 3 (b), another spring mounting portion 21 may be inclined with respect to one spring mounting portion 21, and as shown in FIG. 21 may be arranged in a cross shape. The spring mounting portion 21 can be arranged at an arbitrary position according to the shape of the object to be protected.

The handle will be described with reference to FIG. 4A is a surface view of the insulation protective cover, FIG. 4B is a perspective view of the insulation protective cover observed from the front side, and FIG. 4C is an observation of the insulation protective cover from the direction of arrow A in FIG. FIG.
A handle 27 that can be gripped by a tool for indirect hot wire construction (for example, an insulating jacket) is formed on the non-opposing surface side (surface or surface on the outer side) of the insulating sheet 20 with the object to be protected. The handle 27 is made from the same sheet material as the insulating sheet, and is integrated with the insulating sheet 20 by joining the sheet material to the insulating sheet 20. For joining the sheet material to the insulating sheet, stitching, adhesion, welding, or the like can be used. Of course, the handle 27 may be made of a material different from that of the insulating sheet 20.
A plurality of the handles 27 are formed along the height direction of the insulating sheet 20, and an arbitrary part can be gripped according to the mounting work on the protection target object. Of course, the arrangement, shape, number, etc. of the handles shown in the figures are merely examples, and other configurations may be used.

A method for using the insulating protective cover according to the present embodiment will be described with reference to FIGS. 1 and 5. 5A and 5B are schematic views showing the usage state of the insulating protective cover, in which FIG. 5A is a diagram showing a deployed posture of the insulating protective cover, and FIG. FIG.
As shown in FIG. 1, the bistable spring 10 is mounted on the spring mounting portion 21 of the insulating protective cover 1. One end in the longitudinal direction of the bistable spring 10 taking the first stable posture is accommodated in the inside from the opening 23a of the spring accommodating portion 23 (see arrow B). The other end in the longitudinal direction of the bistable spring 10 protruding from the spring accommodating portion 21 is pressed by the pressing piece 25 to prevent the bistable spring 10 from falling off. In addition, the spring mounting part 21 which mounts the bistable spring 10 is selected according to the shape of the protection target. Further, the bistable spring 10 is mounted so as to be curled on the back side of the insulating sheet 20.
As shown to Fig.5 (a), a handle is hold | gripped in the insulated Yatco 100a as an indirect hot wire tool, and the insulation protective cover 1 is brought close to the utility pole 110 which is an example of a protection target object. Since the insulating protective cover 1 is in a stable deployed posture corresponding to the posture of the bistable spring 10 taking the first stable posture, the insulating protective cover 1 can be brought close to the utility pole 110 while being expanded. it can.

Next, an external force is applied so that the bistable spring 10 is deformed from the first stable posture to the second stable posture by the other insulating yoke 100b. Specifically, an impact in the curl direction of the bistable spring 10 is applied to the end portion in the width direction of the insulating sheet 20 to deform the bistable spring 10 toward the second stable posture.
Due to this impact, as shown in FIG. 5B, the insulating protective cover 1 is wound around the utility pole 110 and takes a protective posture. The insulating protective cover 1 is in close contact with the surface of the utility pole 110 due to the deformation force of the bistable spring to the second stable posture.

In this way, the insulating protective cover 1 can prevent a ground fault caused by contact of a charged member or the like by covering a conductor that is not charged as a protection target. In this example, since the spring mounting portion 21 is disposed on the back side of the insulating sheet 20, when the bistable spring is made of metal, a ground fault or the like may occur even if a charging unit or the like contacts the surface side of the insulating sheet 20. Does not cause.
Of course, the charging unit may be surrounded as a protection target, but when a metal is used as the material of the bistable spring, it is desirable to apply an insulating resin or the like to the surface. Accidents when touching live parts can be prevented.
The electric pole 110 (a concrete electric pole, a steel pipe electric pole, etc.) as shown in FIG. 5 is suitable as a conductor as an object to be protected by the insulating protective cover, but other protective objects are protected by using the insulating protective cover. May be.

  As described above, the bistable spring can take two stable postures, ie, the extended first stable posture and the second stable posture curled like a spring, and is deformed between each stable posture. To do. The insulating sheet includes a spring mounting portion for mounting a bistable spring. Since the insulating sheet has flexibility, it is deformed according to the posture of the attached bistable spring. That is, the insulating protective cover is deformed according to the posture of the bistable spring, takes an expanded posture when the bistable spring takes the first stable posture, and when the bistable spring takes the second stable posture. Take protective posture to cover the object to be protected. Since the insulation protection cover can be insulated and protected by bringing the insulation protection cover in the deployed position close to the protection object and deforming the bistable spring to the second stable posture, it is easy to attach the insulation protection cover to the protection object. is there.

In addition, since the bistable spring is configured to be detachable from the insulating sheet, the object to be protected can be protected by using an insulating protective cover to which the bistable spring is attached, and the bistable spring is not attached. It is also possible to protect the object to be protected using an insulating protective cover. An insulating protective cover without a bistable spring can be used as a general insulating sheet.
In addition, since a plurality of bistable springs are arranged along the extending direction, the degree of adhesion of the insulating sheet to the object to be protected can be increased. In addition, since the plurality of bistable springs are arranged in parallel with each other along the extension direction, they do not hinder the deformation to the first or second stable posture with each other, so that the protection object is effectively insulated and protected. .
In addition, since the handle is provided on the surface not facing the protection object, the insulating protection cover can be easily attached to and detached from the protection object by gripping the handle with the indirect hot wire method tool.

[Second Embodiment]
An insulating protective cover according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a back view of the insulating protective cover according to the second embodiment of the present invention. FIGS. 7A and 7B are diagrams illustrating an example of the shape holding member, in which FIG. 7A is a plan view and FIG. The insulating protective cover according to the present embodiment is characterized in that the shape holding member is arranged along the direction intersecting the longitudinal direction of the bistable spring. In addition, the same code | symbol is attached | subjected to the member same as 1st embodiment, and the description is abbreviate | omitted.
On the back surface of the insulating sheet 20 of the insulating protective cover 2, a shape holding member 30 extending along the direction intersecting the longitudinal direction of the bistable spring 10 (extending direction of the bistable spring) is disposed. In particular, in this example, the shape holding member 30 is orthogonal to the bistable spring 10.

The shape holding member 30 plays a role of stabilizing the posture of the insulating sheet 20 that takes the deployed posture. In order to prevent the upper part of the insulating sheet 20 from sagging due to gravity, the shape retaining member 30 is a long band-like resin or metal having rigidity capable of withstanding the force when the upper part of the insulating sheet 20 is sagging. Etc. At one end in the longitudinal direction of the shape retaining member 30 (lower end in FIG. 7), an arrow indicating the insertion direction of the shape retaining member 30 and the direction (front surface, back surface) of the shape retaining member is described.
In addition, in this example, it was set as the structure which arrange | positions the one shape holding member 30 extended over substantially the whole area of the height direction of the insulating sheet 20, However, The shape holding member 30 is followed along the height direction of the insulating sheet 20. A plurality of them may be arranged in series.

The insulating sheet 20 includes a shape holding member mounting portion 40 for detachably mounting the shape holding member 30. In FIG. 6, the shape holding member mounting portions 40 are disposed at both ends in the width direction of the insulating sheet 20. You may arrange | position a shape maintenance member mounting part also to the width direction intermediate part of the insulating sheet 20. FIG. Further, the bistable spring 10 and the shape holding member 30 may be arranged so as to partially overlap, for example, in a cross shape.
Each shape holding member mounting portion 40 is arranged at the lower end of the insulating sheet 20, and a plurality of lower support members 41 that support the lower end of the shape holding member 30 and a plurality of the shape holding member mounting portions 40 along the height direction of the insulating sheet 20 to hold the shape. Intermediate support members 43 that respectively support the longitudinal intermediate portions of the members 30 are provided.
The lower support member 41 has a bag shape with the top opened, and prevents the shape holding member 30 from falling. Further, the intermediate support member 43 is disposed on the shape maintaining member 30 so as to straddle the lateral direction of the shape maintaining member 30. The intermediate support member 43 is made of the same material as the insulating sheet 20, and one end 43 a of the intermediate support member 43 is joined to the insulating sheet 20. As a joining method, stitching, adhesion, welding, or the like can be used. The other end of the holding piece 25 is provided with a hook-and-loop fastener 43b that can be attached to and detached from a hook-and-loop fastener (not shown) provided on the back surface of the insulating sheet 20. The intermediate support member 43 prevents the shape holding member 30 from being separated from the insulating sheet 20 and falling off by pressing the shape holding member 30 against the back surface of the insulating sheet 20.

The shape holding member 30 includes a plurality of anti-slip members 31 (anti-slip) at appropriate positions in the middle portion in the longitudinal direction. The anti-slip member 31 is disposed at a position that does not buffer the intermediate support member 43 when the shape holding member 30 is mounted on the shape holding member mounting portion 40. That is, the anti-slip member 31 is exposed on the side facing the protection object in a state where the shape holding member 30 is mounted on the shape holding member mounting portion 40. When the protective object is covered with the insulating protective cover 2, the anti-slip member 31 is brought into close contact with the surface of the protective object, thereby preventing the relative movement of the insulating protective cover 2 with respect to the protective object.
The anti-slip member 31 can be a high friction force member such as rubber. In the case of using rubber or the like, as shown in FIG. 7B, the anti-slip effect is increased by making the contact surface with the object to be protected uneven. In particular, by making the unevenness of the jagged surface downward, the anti-slip effect can be effectively exhibited by utilizing the elastic deformation of the anti-slip member 31.

The anti-slip member 31 can be a magnet (magnetic material). In the case of a magnet, when the object to be protected is a steel pipe utility pole, the insulating protective cover 2 can be effectively brought into close contact with the steel pipe utility pole.
In any case, it is desirable to keep the thickness of the anti-slip member 31 within about 1 cm. This is to prevent wind from entering through a gap formed between the insulating sheet 20 and the object to be protected to lift the insulating protective cover 2 and to remove the insulating protective cover 2 from the object to be protected.
Although the anti-slip member may be provided directly on the back surface of the insulating sheet 20, the application range of the insulating sheet 20 can be expanded by providing the anti-slip member on the shape holding member 30 that is detachable from the insulating sheet 20.
About the usage method of the insulation protection cover 2 which concerns on this embodiment, since it is the same as that of 1st embodiment, the description is abbreviate | omitted.

  As described above, the insulating protective cover according to the present embodiment includes the shape holding member that extends along the direction intersecting the extending direction of the bistable spring. When a furoshiki-shaped sheet member generally used as an insulating sheet is employed, it may be difficult to maintain the entire insulating sheet in an expanded state with only a bistable spring. In the present invention, since the shape holding member is provided, the posture of the insulating protective cover can be stabilized in an expanded state. Further, since the shape holding member is arranged so as to extend along the direction intersecting with the extending direction of the bistable spring, the shape holding member does not hinder the deformation of the bistable spring into the first or second stable posture.

Moreover, since the shape holding member is configured to be detachable, use or non-use of the shape holding member can be selected according to the shape of the protection target. When both the bistable spring and the shape holding member are removed, the insulating sheet can be used as a normal insulating sheet.
In addition, it is good also as a structure which divided | segmented the shape holding member and the shape holding member mounting part into plurality in the height direction of the insulating sheet, and arranged in series along the height direction of the insulating sheet. In this case, it is possible to attach the shape holding member to an arbitrary location according to the shape of the protection target. For example, when the shape holding member and the bistable spring are mounted only on the shape holding member mounting portion and the spring mounting portion positioned above, respectively, the lower portion of the insulating protective cover can be freely deformed. In this case, the insulation protection cover is wound around the utility pole as the protection target while stabilizing its posture, and the lower part of the insulation protection cover is used for insulation protection of the pin insulator installed adjacent to the utility pole. Can be used.
Further, since the anti-slip member is provided on the side facing the protection object, the displacement of the insulating sheet with respect to the protection object can be prevented and the protection object can be effectively covered.

  DESCRIPTION OF SYMBOLS 1, 2 ... Insulation protective cover, 10 ... Bistable spring, 20 ... Insulating sheet, 21 ... Spring mounting part, 23 ... Spring accommodating part, 23a ... Opening, 25 ... Holding piece, 25b ... Hook fastener, 27 ... Handle, 30 ... shape retaining member, 31 ... anti-slip member, 40 ... shape retaining member mounting portion, 41 ... lower support member, 43 ... intermediate support member, 43b ... hook-and-loop fastener, 100 ... insulating yarn, 110 ... utility pole (protection object)

Claims (6)

A bistable spring that deforms mutually between the extended first stable posture and the second stable posture curled into a spring;
An insulating protective cover, comprising: a flexible insulating sheet including a spring mounting portion for mounting the bistable spring.   The insulating protective cover according to claim 1, wherein the bistable spring is detachable from the insulating sheet.   The insulating protective cover according to claim 1, wherein a plurality of the bistable springs are arranged on the insulating sheet along an extension direction thereof.   The insulating protective cover according to any one of claims 1 to 3, further comprising a shape holding member extending along a direction intersecting with an extension direction of the bistable spring.   The insulating protective cover according to any one of claims 1 to 4, further comprising an anti-slip member provided on a surface facing the protective object.   The insulating protective cover according to any one of claims 1 to 5, further comprising a handle that can be gripped by a tool for an indirect hot wire method on a surface that does not face the protective object.

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