JP6792118B2 - Low-pressure retention insulators and attachments for low-pressure retention insulators - Google Patents

Description

The present invention relates to a low voltage insulator that supports a folded portion of a retaining grip connected to a low voltage wire.

In facility work to hold the erected low-voltage electric wire to a utility pole, etc., the work of attaching the retaining grip connected to the low-voltage electric wire to the guide groove of the low-voltage insulator fixed to the arm of the utility pole via a support tool, etc. Will be done. This low-pressure retention insulator is disclosed in FIG. 3 of Patent Document 1, FIG. 6 of Patent Document 2, and the like.

Japanese Unexamined Patent Publication No. 2001-78340 Japanese Unexamined Patent Publication No. 11-178179

FIG. 7 shows a facility method for a retention grip using a conventional low-pressure retention insulator.
The conventional low-pressure retention insulator 29 is made of porcelain and has a tubular shape in which a bolt through hole 27 is formed at the center. On the outer wall of the cylinder, collar portions 23 and 24 are provided on both sides of the central portion in the axial direction. As a result, a guide groove 25 in the circumferential direction is formed in the central portion in the axial direction between the flange portions 23 and 24. The bottom of the guide groove 25 has a smooth curved surface having a substantially arcuate cross-sectional shape.

The metal support 70, which is attached to the arm metal of a utility pole and supports the low-voltage retention insulator 29, has two support plates 71, 72 and two support plates 71, 72 arranged in parallel with each other. It has a back plate 73 to be connected. In the low-pressure retention insulator 29, the axial end surfaces 21 and 22 are sandwiched between the two support plates 71 and 72, and the holes 725, bolt through holes 27, and first support plate of the second support plate 72 are sandwiched between the two support plates 71 and 72. A bolt 77 penetrating the hole 715 of the 71 is screwed into the nut 78 to be supported by the support 70. There is nothing in the space 75 inside the support 70 that regulates the position of the retention grip 96.

The retaining grip 96 is a folded-back portion in which the side opposite to the side connected to the low-voltage electric wire 95 turns half a turn. The folded portion is composed of a coated wire 98 having a coating on the surface of the strand 97. However, the coated wire 98 does not have sufficient insulating properties with respect to the voltage of the low voltage electric wire 95.
As shown in FIG. 7A, in the situation where the facility work is normally carried out, the coating wire 98 of the retaining grip 96 is guided in a state of being in contact with the bottom of the guide groove 25. In this situation, the retaining grip 96 is unlikely to come into contact with a metal portion such as the support 70.

On the other hand, in the case of the facility failure shown in FIG. 7B, the coating wire 98 may not fit in the guide groove 25 at the folded portion of the retention grip 96 and may be installed in a state of deviating from the guide groove 25. For example, as shown in the X portion, the coating wire 98 may get over the lower flange portion 24 in the figure and come into contact with the metal second support plate 72. If the low-voltage electric wire 95 is energized in such a state of facility failure, a current flows from the retaining grip 96 to the support 70, and there is a risk of electric shock when a person touches the arm or utility pole to which the support 70 is attached. ..
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a low-pressure insulator that prevents the occurrence of facility defects.

The first aspect of the present invention is a low-voltage retaining insulator that supports a folded portion of a retaining grip connected to a low-voltage electric wire, and includes an insulating main body portion and a ring portion .
The main body has a tubular shape with a bolt through hole formed in the center, and a circumferential guide groove for guiding the retaining grip is formed in the central portion in the axial direction.
The ring portion is provided on one side in the radial direction of the main body portion, and an insertion hole through which the retention grip can be inserted in the folded portion is formed so as to prevent the retention grip from deviating from the guide groove . The main body and the ring are integrally formed of a porcelain material.
In this form, the deviation prevention function of the retaining grip can be realized with one component. The main body portion and the ring portion may be integrally formed of the resin material.

In the facility work using the low-voltage retention insulator of the present invention, one end of the opened retention grip is passed through the insertion hole of the ring portion, and then twisted with the other end and connected to the low-voltage electric wire. As a result, it is possible to prevent the occurrence of facility defects in which the folded portion of the retaining grip deviates from the guide groove.

In a typical form in which a low-pressure insulator is supported, one and the other end faces in the axial direction of the main body face each of two support plates arranged parallel to each other. Further, on the back wall portion on the side opposite to the main body portion of the ring portion, two support plates are connected to form a support together with the two support plates, or two support plates are fixed. It is arranged so as to face one side of the arm.
On the premise of this support form, it is preferable that the ring portion is formed so as to fill a part of the gap between each support plate and the back plate or the arm metal.

As a result, depending on the shape and dimensions of the support, there is no space outside the ring portion through which the retaining grip can pass. Alternatively, even if space exists, it is limited to a small area. Therefore, in the facility work, the retaining grip must be inserted into the insertion hole of the ring portion without fail, so that the occurrence of facility defects can be prevented more reliably.

A second aspect of the present invention is a low-voltage retaining insulator that supports a folded portion of a retaining grip connected to a low-voltage electric wire, and has an insulating main body made of a porcelain material and an attachment made of a resin material. And.
The main body has a tubular shape with a bolt through hole formed in the center, and a circumferential guide groove for guiding the retaining grip is formed in the central portion in the axial direction.
When the attachment is attached to the main body, an insertion hole is formed on one side of the main body in the radial direction so that the retention grip can be inserted in the folded portion so as to prevent the retention grip from deviating from the guide groove. It constitutes a ring part.
One and the other end faces in the axial direction of the main body face each other with two support plates arranged parallel to each other.

The attachment connects the two caps that cover both ends of the main body in the axial direction, the two arms that extend laterally from the two caps, and the two arms, and when attached to the main body, a guide groove. It has a back wall portion that forms an insertion hole with the bottom of the. The connecting portion between the back wall portion and the two arm portions is formed so as to be elastically deformable so that the two arm portions and the two cap portions extend outward. Further, one or both of the cap portions are provided with a detent portion that can be locked to the support plate. In this form, the deviation prevention function of the retaining grip can be easily added by diverting the existing low-pressure retaining insulator and retrofitting only the attachment .

It is a perspective view of the low pressure retaining insulator according to 1st Embodiment. FIG. 1A is a plan view and FIG. 1B is a side view of the low-pressure retention insulator of FIG. It is a figure of the utility pole which shows the use state of a low-voltage retention insulator. It is a cross-sectional view taken along the line aa of (a): (b), and (b): side view in the state where the holding grip of the electric wire is provided in the low-voltage retaining insulator. (A): perspective view 1 and (b): perspective view 2 of the low-pressure retention insulator according to the second embodiment. FIG. 2A is a plan view and FIG. 2B is a side view of the low-pressure retention insulator of FIG. It is a figure which shows (a): regular facility state, (b): facility failure state of the conventional low-voltage retention insulator.

Hereinafter, a plurality of embodiments of the low-pressure retention insulator will be described with reference to the drawings. As described in the Background Techniques and Issues section, the low voltage retaining insulator is an insulating component that supports the folded portion of the retaining grip connected to the low voltage wire.
(First Embodiment)
The low-pressure insulator of the first embodiment will be described with reference to FIGS. 1 to 4.
First, the configuration of the low-voltage retention insulator alone is shown in FIGS. 1 and 2. In the low-pressure retention insulator 101 of the first embodiment, the main body portion 20 and the ring portion 30 are integrally formed of a porcelain material, and have insulating properties.

The shape of the main body 20 is basically the same as the shape of the conventional low-pressure retention insulator 29 (see FIG. 7) described in the column of [Problems to be solved by the invention]. That is, the main body portion 20 has a tubular shape in which the bolt through hole 27 is formed at the center, and a guide groove 25 in the circumferential direction for guiding the retaining grip is formed in the central portion in the axial direction. In addition, the same reference numerals are given to the configurations substantially the same as those of the conventional low-pressure retention insulator 29, and the description thereof will be omitted.
Further, for convenience of explanation, the state in which the product is installed in the direction of FIG. 1 or 2 (b) is set as the basic posture, and the end face 21 side is described as the top and the end face 22 side is described as the bottom.

The ring portion 30 is provided on one side of the main body portion 20 in the radial direction in a laterally substantially U shape. The extension portions 33 and 34 corresponding to the straight portions on both sides of the U-shape have the same thickness in the height direction and the widths in the horizontal direction from the flange portions 23 and 24 of the main body portion 20, respectively. It extends laterally so that it gradually decreases from the diameter of. The back wall portion 36 corresponding to the curved portion of the bottom of the U-shape is formed in a shape in which the ends of the extension portions 33 and 34 are rotated inward by about 90 degrees and connected.
A tubular space surrounded by a part of the guide groove 25 of the main body 20 and the extension 33, 34 and the back wall 36 constitutes an insertion hole 35. The size of the insertion hole 35 is such that the retaining grip can be inserted at the folded-back portion.

Ribs 31 projecting along the widthwise center line of the extension portions 33, 34 on the surface of the extension portions 33, 34 opposite to the insertion holes 35, that is, on the upper surface of the extension portion 33 and the lower surface of the extension portion 34. , 32 are provided. The end faces of the ribs 31 and 32 in the height direction are located on the same surface as the end faces 21 and 22 of the main body 20. Further, the end faces of the ribs 31 and 32 on the side far from the main body portion 20 are located on the same surface as the back surface of the back wall portion 36. The functions of the ribs 31 and 32 will be described later with reference to FIG.

Next, the usage state of the low-pressure retention insulator 101 will be described with reference to FIGS. 3 and 4.
As shown in FIG. 3, the low-voltage retention insulator 101 is attached to a horizontal arm 91 and a vertical arm 92 attached to a utility pole 90, and a folded-back portion of an retention grip 96 connected to a low-voltage electric wire 95. To support.
The upper two figures of FIG. 3 show a state in which the low-pressure retention insulator 101 is attached to the arm 91 in the horizontal direction by a direct mounting method 700 using two support plates 71 and 72. The lower figure of FIG. 3 shows a state in which the low-pressure retention insulator 101 is attached to the arm metal 92 in the vertical direction via a U-shaped support 70 or the like.

In FIG. 4, the point that the main body 20 of the low-pressure retaining insulator 101 is pivotally supported by the support 70 by the bolt 77 and the nut 78, and the point that the folded-back portion of the retaining grip 96 is guided to the guide groove 25 of the main body 20 are , The configuration is the same as that of the prior art shown in FIG. As described in the prior art, the folded portion of the retaining grip 96 is composed of a coated wire 98 having a coating on the surface of the strand 97, but has sufficient insulation against the voltage of the low voltage electric wire 95. It's not a thing.

The difference between the low-pressure retention insulator 101 and the conventional technique is that the retention grip 96 is not only guided to the guide groove 25, but is also inserted into the insertion hole 35 of the ring portion 30 with one end of the retention grip 96 open. Is. Since the movable range of the retaining grip 96 inserted through the insertion hole 35 is restricted, the coating wire 98 deviates from the guide groove 25 and comes into contact with the support plates 71 and 72 as shown in FIG. 7B of the prior art. Facility defects cannot occur. Therefore, it is possible to prevent an accident in which a person touches the arms 91 and 92 and the utility pole 90 and receives an electric shock when the low-voltage electric wire 95 is energized.

Further, in a state where the low-pressure retaining insulator 101 is pivotally supported by the support 70, the axial end faces of the ribs 31 and 32 of the ring portion 30 and the support plates 71 and 72 face each other, and the back wall portion 36 and the support 70 It is arranged so as to face the back plate 73. At this time, the gap δ1 between the upper surface of the upper rib 31 of the ring portion 30 and the first support plate 71, the gap δ2 between the lower surface of the lower rib 32 and the second support plate 72, and the back wall portion 36 and the support tool 70. The gap δ3 with the back plate 73 of the above is preferably formed so as to be smaller than the wire diameter Dw of the retaining grip 96. That is, the ribs 31 and 32 have a function of filling the gap between the extension portions 33 and 34 and the support plates 71 and 72 as much as possible.

As a result, even if an attempt is made to pass the retaining grip 96 between the ring portion 30 and the support 70 in facility work, there is no space through which the retaining grip 96 can pass, or even if it exists, the space is limited to a small range. .. Therefore, it is impossible to install the retention grip 96 unless the insertion hole 35 is inserted. Therefore, it is possible to reliably prevent facility defects.

In the support tool 70 shown in FIGS. 4 (b) and 7 (b), the upper and lower support plates 71 and 72 and the back plate 73 are integrally formed by bending a metal plate. In addition to this type of support 70, the upper and lower support plates 71 and 72 may be fixed so as to directly sandwich the side surfaces of the arms 91 and 92 by the direct mounting method 700 shown in FIG. In that configuration, the back wall portion 36 of the ring portion 30 is arranged so as to face one surface of the arms 91 and 92. The gap between the back wall portion 36 and the facing surfaces of the arms 91 and 92 is preferably formed so as to be smaller than the wire diameter Dw of the retaining grip 96.

(Second Embodiment)
Next, the low-pressure retention insulator of the second embodiment will be described with reference to FIGS. 5 and 6.
The low-pressure retention insulator 102 of the second embodiment includes a main body portion 29 made of a porcelain material and an attachment 40 made of a resin material separately from the main body portion 29. The attachment 40 constitutes a "ring portion" when attached to the main body portion 29.
The main body 29 is substantially the same as the conventional low-pressure insulator shown in FIG. 7.

The attachment 40 includes two cap portions 41 and 42, two arm portions 43 and 44, a back wall portion 46 and the like.
The cap portions 41 and 42 cover both ends of the main body portion 29 in the axial direction. Holes 415 and 425 communicating with the bolt through holes 27 are formed in the centers of the cap portions 41 and 42.
The arm portions 43 and 44 extend laterally from the cap portions 41 and 42. The axial end faces of the arm portions 43 and 44 and the cap portions 41 and 42 are formed on the same surface.

The back wall portion 46 is formed in a flat plate shape substantially orthogonal to the cap portions 41, 42 and the arm portions 43, 44, and connects the two arm portions 43, 44.
The connecting portions 435 and 445 between the back wall portion 46 and the arm portions 43 and 44 are rounded at the outer corners with a relatively small radius (R), and are recessed so as to gouge from the inside toward the corners. Is formed. Therefore, the wall thickness of the corner portion is locally thinner than the wall thickness of both adjacent sides. As a result, the arm portions 43, 44 and the cap portions 41, 42 can be elastically deformed so as to spread outward with the thin connecting portions 435 and 445 as fulcrums.

Therefore, in the natural state of the attachment 40, the distance between the two cap portions 41 and 42 is shorter than the length between the axial end surfaces 21 and 22 of the main body portion 29, but the cap portions 41 and 42 are elastic outward in the axial direction. By deforming it, it can be attached to the main body 29. Further, the attachment 40 once attached to the main body 29 is not likely to come off naturally unless a force is intentionally applied.

With the attachment 40 attached to the main body 29 in this way, the inner wall of the back wall 46 is close to the collars 23 and 24 of the main body 29. Then, an insertion hole 45 is formed between the inner wall of the back wall portion 46 and the bottom of the guide groove 25 of the main body portion 29.
Similar to the first embodiment, in the facility work using the low-voltage retention insulator 102 of the second embodiment, one end of the opened retention grip 96 is passed through the insertion hole 45 and then twisted with the other end to form a low-voltage electric wire 95. Connect to. As a result, it is possible to prevent the occurrence of facility defects in which the folded portion of the retaining grip 96 deviates from the guide groove 25.

Further, as shown in FIG. 6B, the contour of the attachment 40 is formed according to the inner dimension of the support 70 indicated by the alternate long and short dash line, and the retaining grip 96 can pass through the outside of the attachment 40. Space does not exist, or even if it exists, it is limited to a small area. Therefore, in facility work, it is possible to more reliably prevent the occurrence of facility defects.
Further, in the second embodiment, the existing low-pressure insulator 29 is diverted in the repair work at the place where the conventional low-pressure insulator 29 is installed, and only the attachment 40 is retrofitted to simplify the deviation prevention function of the retaining grip. Can be added to.

(Other embodiments)
(A) In the above embodiment, on the premise that the existing support is used, the structures such as the ribs 31, 32 and the arms 43, 44 that fill the gap between the ring portion and the support are placed on the low pressure insulator 101, 102 side. It is provided. Not limited to this, the inner shape of the support may be manufactured according to the outer shape of the low-pressure insulator.

(B) In the attachment 40 of the second embodiment, one or both of the cap portions 41 and 42 may be provided with a detent portion that can be locked to the support plates 71 and 72. As a result, the rotation of the low-pressure retaining insulator 102 can be prevented by either the direct mounting method 700 or the mounting method using the U-shaped support 70.
The attachment 40 of the second embodiment is formed so that the cap portions 41 and 42 completely cover the outer circumferences of both ends of the main body portion 29, but the cap portion is fitted to the inner wall of the bolt through hole 27. It may be formed.
Further, the attachment may be attached to the main body 29 so as to hold the collars 23 and 24 from the outside in the radial direction.

(C) The attachment is not limited to a single component, and may be a combination of two or more components. For example, a component constituting the ring portion may be slid from the side and attached to the main body portion, and then a lock component for preventing the ring may be attached from the opposite side. With such a configuration, it is not necessary to have an elastic deformation function for attachment to the main body.
As described above, the present invention is not limited to such embodiments, and can be implemented in various embodiments without departing from the spirit of the invention.

101, 102 ... Low pressure insulator,
20, 29 ... Main body, 25 ... Guide groove, 27 ... Bolt through hole,
30 ... Ring part, 35, 45 ... Insertion hole,
40 ... Attachment (ring part),
70 ... Support,
95 ... Low voltage wire, 96 ... Retaining grip.

Claims (5)

A low-voltage insulator that supports the folded-back portion of the retaining grip (96) connected to the low-voltage electric wire (95).
With an insulating main body (20) having a tubular shape with a bolt through hole (27) formed in the center and a circumferential guide groove (25) forming a circumferential guide groove (25) for guiding the retaining grip in the central portion in the axial direction. ,
A ring portion provided on one side in the radial direction of the main body portion and having an insertion hole (35) formed in which the retention grip can be inserted in the folded portion so as to prevent the retention grip from deviating from the guide groove. (30) and
Equipped with a,
A low-pressure insulator characterized in that the main body portion and the ring portion are integrally formed of a porcelain material . One and the other end faces (21, 22) of the main body in the axial direction face each other and two support plates (71, 72) arranged in parallel with each other, respectively, and
The back wall portions (36, 46) of the ring portion on the side opposite to the main body portion are back plates (73) that connect the two support plates and form a support tool (70) together with the two support plates. ) Or, the two support plates are arranged so as to face one surface of the arm (91) to which the two support plates are fixed.
The low-pressure retention insulator according to claim 1, wherein the ring portion is formed so as to fill a gap between the ring portion and the support plate and a part of the gap between the back plate and the arm metal. .. A low-voltage insulator that supports the folded-back portion of the retaining grip (96) connected to the low-voltage electric wire (95).
Insulating, which is made of porcelain material and has a tubular shape with a bolt through hole (27) formed in the center, and a circumferential guide groove (25) is formed in the central portion in the axial direction to guide the retaining grip. Main body (29) and
When the retaining grip is formed of a resin material and is attached to the main body , the retaining grip is inserted into one side of the main body in the radial direction so as to prevent the retaining grip from deviating from the guide groove. An attachment (40) forming a ring portion in which a possible insertion hole (45) is formed, and an attachment (40).
With
One and the other end faces (21, 22) in the axial direction of the main body portion face each other with two support plates (71, 72) arranged in parallel with each other.
The attachment is
Two cap portions (41, 42) that cover both ends of the main body in the axial direction,
Two arm portions (43, 44) extending laterally from the two cap portions and
It has a back wall portion (46) that connects the two arm portions and forms the insertion hole (45) with the bottom of the guide groove when mounted on the main body portion.
The connecting portion (435, 445) between the back wall portion and the two arm portions is formed so as to be elastically deformable so that the two arm portions and the two cap portions spread outward.
A low-pressure insulator characterized in that one or both of the cap portions are provided with a detent portion that can be locked to the support plate . The back wall portion is a back plate (73) that connects the two support plates to form a support (70) together with the two support plates, or an arm metal to which the two support plates are fixed. (91) low anchor insulators according to the Turkish are disposed so as to face one surface to claim 3, wherein the. Low圧引distillate insulator attachment low anchor is that used in stone according to claim 3 or 4.

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