JP5951721B2 - Protective tube - Google Patents

Description

  The present invention relates to a protective tube that is attached to a high-voltage distribution line in a live line (energized) state using, for example, an indirect hot line tool.

  For example, construction work may be performed using a heavy machine such as a tow truck in the vicinity of the high-voltage distribution line. In this case, the heavy machinery may come into contact with the high-voltage distribution line to break the wire, or damage the coating of the wire. In addition to avoiding the heavy machinery from directly contacting the high-voltage distribution line as described above, a protective pipe is attached to the high-voltage distribution line so as to serve as a mark for the high-voltage distribution line.

  Conventionally, a protective tube is attached to a high-voltage electric wire using a protective tube insertion machine. However, the protective tube insertion machine is not only large and heavy, but also requires a lot of preparation time before starting installation, which makes it difficult to handle. Generally, a large number (15) of protective pipes may be attached to one span (45 m) of the high-voltage electric wire, or a few protective pipes of about 2 to 3 may be attached. In particular, when a small number of protective pipes are installed, the work using the protective pipe insertion machine, which takes a lot of preparation time, is unsuitable.

  Therefore, the protective pipe is configured as follows so that the protective pipe can be expanded with an indirect hot wire tool and a high-voltage electric wire can be inserted into the protective pipe without using a protective pipe insertion machine. In other words, the protective tube protrudes in the outer peripheral direction at the slit side end of the pair of expanding portions and the cylindrical main body having a pair of expanding portions that can be expanded by the slit formed over the entire length in the longitudinal direction. A pair of hooks for close contact with each other and a pair of square recesses into which a pair of gripping parts provided at the tip of the indirect hot wire tool can be inserted into the outer wall of the hooks. And a wall portion to be formed. Therefore, by inserting the pair of gripping portions of the indirect live tool from below into the pair of recesses of the protective tube with the pair of hooks facing downward, and opening the gripping portion in the inserted state, Expand the expansion part. A high-voltage electric wire is inserted into the main body through a large opening formed by the expansion (see, for example, Patent Document 1).

Japanese Patent No. 5519035

  According to the above configuration, since the pair of gripping portions of the indirect live tool is simply inserted into the pair of square-shaped recesses, when the gripping portion is opened in the inserted state, the gripping portions are moved into the recesses. On the other hand, it slips and the gripping part comes off from the recess. As a result, the pair of expanding portions may not be expanded. In addition, it is difficult to apply force to the side where the gripping portion is opened, and it is a labor-intensive operation to open the pair of expanding portions, and there is room for improvement.

  Then, this invention makes it a subject to provide the protective tube which can expand a pair of expansion part easily and reliably using an indirect hot wire tool.

The protective tube according to the present invention includes a cylindrical main body having a pair of expanded portions that can be expanded by a slit formed over the entire length in the longitudinal direction, and a pair of expanded portions provided in the pair of expanded portions. Each of the expansion operation portions includes a fixing portion that is fixed to the expansion portion, and an extension portion that extends from the fixing portion so as to protrude outward with respect to the main body. The pair of expansion operation parts are arranged such that the fixed parts are separated from each other by the extension parts approaching each other, and the fixed parts are brought closer to each other by the separation of the extension parts from each other. And the pair of extending portions are configured to be respectively engageable with a pair of openable and closable gripping portions provided at the tip of the indirect live tool, and in the locked state, the pair of gripping portions are By closing, the extension parts approach each other and the fixing parts separate from each other It is, constituting the pair of widening part by expanded to allow inserting the wire into the body, one of the gripping portions of the pair of gripping portions, a pair of protrusions bifurcated And the other gripping part is composed of an insertion part having a size capable of entering between the one bifurcated projection part, and one extension part of the pair of extension parts is It is composed of a locking projection that can enter and be locked between the bifurcated protrusions, and the other extension part is composed of a pair of bifurcated protrusions that the insertion part enters and locks. It is characterized by having.

According to such a configuration, the extension portion and the gripping portion are locked when the pair of gripping portions are closed in a state where the pair of gripping portions of the indirect hot wire tool is locked to the pair of extension portions. The pair of gripping portions are not detached from the pair of extending portions and are not displaced. Therefore, by closing the pair of gripping portions, the extending portions approach each other and the fixing portions are separated from each other, whereby the pair of expanding portions to which the fixing portions are fixed can be reliably expanded. And the force to the side which closes a pair of holding | gripping part is easy to enter compared with the force to the opening side, and can expand a pair of expansion part easily.
In addition, one extension portion is configured by a locking projection that can be locked by entering between the forked projections, and the other extension portion can be locked by being inserted by the insertion portion. By comprising from a protrusion part, latching is not cancelled | released and a pair of expansion part can be expanded more reliably.

  In the protective tube according to the present invention, the pair of expansion operation portions may be connected so as to be swingable about an axis along the longitudinal direction of the main body.

  As described above, the pair of extending portions are connected to each other so as to be swingable about the axis along the longitudinal direction of the main body. The opening can be smoothly expanded.

  In the protective tube according to the present invention, the pair of extending portions may be configured as curved portions that are curved outward so as to be separated from each other.

  As described above, by configuring the pair of extending portions into curved portions that are curved outward so as to be separated from each other, the pair of gripping portions can easily enter the curved portion, and the locking is not released. The pair of expanded portions can be expanded more reliably.

  As described above, according to the present invention, a pair of expansions using an indirect hot wire tool is achieved by closing the pair of gripping portions in a state where the pair of gripping portions are locked to the pair of extending portions. It is possible to provide a protective tube capable of easily and reliably expanding the portion.

The side view of the protection pipe | tube which concerns on one Embodiment of this invention is shown. An indirect hot wire tool is shown, (a) is a side view, (b) is a perspective view. (A) is a longitudinal front view showing a state immediately before the protective pipe is expanded using an indirect hot wire tool, and (b) is a vertical front view showing a state where the protective pipe is expanded using an indirect hot tool. FIG. It is a side view of the principal part which shows the state which latched one holding part of the indirect hot wire tool to the extension part of the side corresponding to this. It is a side view of the principal part which shows the state which latched the other holding part of the indirect hot wire tool to the extension part of the side corresponding to this. It is a disassembled perspective view of a pair of expansion operation part. It is a vertical front view which shows the state which expanded the protection pipe of another structure using the indirect hot wire tool corresponding to it.

  A protective tube according to the present invention will be described with reference to the drawings. FIG. 1 shows a protective tube 1, which is expanded by an indirect hot wire tool 2 shown in FIGS. 2 (a) and 2 (b), and an electric wire (for example, as shown in FIG. 3 (b)). A high voltage electric wire 3 is inserted.

  The protective tube 1 is made of an insulating material such as plastic and has a pair of expanded portions 5A that can be expanded by slits 4 (see FIGS. 3A and 3B) formed over the entire length in the longitudinal direction. A cylindrical main body 5 having 5B and a pair of expansion operation sections 6 and 7 provided at three positions in the longitudinal direction of the main body 5 to expand the pair of expansion sections 5A and 5B (one in FIG. 1) Only the expansion operation unit 7 is shown). The protective tube 1 is generally 1.5 m, 2 m, 2.5 m or the like in length, but is not limited to these lengths. Here, although a pair of expansion operation parts 6 and 7 are attached to three places in the longitudinal direction of the main body 5, the number of attachments of the pair of expansion operation parts 6 and 7 is changed according to the length of the protective tube 1. It will be.

  A receiving portion 5C formed in a trumpet shape that expands toward the front end side is formed at the front end portion in the longitudinal direction of the main body 5, and a rear end that can be inserted into the receiving portion 5C at the rear end portion in the longitudinal direction of the main body 5 An insertion portion 5D having a smaller diameter toward the side is formed. Therefore, by inserting the insertion portion 5D (or receiving portion 5C) of the next protective tube 1 into the receiving portion 5C (or insertion portion 5D) of the previous protective tube 1, the protective tubes 1 and 1 can be quickly connected. can do.

  As shown in FIGS. 1 and 3 (a) and 3 (b), the slit-side end of the pair of expanded portions 5A and 5B is a flat plate for projecting in the outer peripheral direction and closely contacting each other to close the slit. A pair of flange portions 5a and 5b (only one flange portion 5b is shown in FIG. 1) are integrally formed over the entire length in the longitudinal direction.

  As shown in FIGS. 3 to 6, the pair of expansion operation units 6 and 7 are made of an insulating material such as plastic. And these pair of expansion operation parts 6 and 7 are integrated by the bolt 8 and the nut 9 which are mentioned later. Specifically, the pair of expansion operation portions 6 and 7 are outwardly directed to the main body 5 with a pair of fixing portions 6A and 7A fixed to the pair of expansion portions 5A and 5B by an adhesive, welding, or the like. And a pair of extending portions 6B, 7B extending from the pair of fixing portions 6A, 7A.

  The fixed portions 6A and 7A are formed in an arc shape with substantially the same curvature as the expanded portions 5A and 5B along the outer surfaces of the expanded portions 5A and 5B. Extending portions 6B and 7B extend from one ends of the fixing portions 6A and 7A in the arcuate direction. These extending portions 6B and 7B are configured as curved portions that are curved outward so as to be separated from each other.

  As shown in FIGS. 3A, 3 </ b> B, and 6, the pair of expansion operation units 6 and 7 are swingably connected around an axis (bolt) 8 along the longitudinal direction of the main body 5. . Specifically, the bolt 8 constituting the shaft is inserted into the boundary portion between the one fixing portion 6A and the extending portion 6B on the same side and the boundary portion between the other fixing portion 7A and the extending portion 7B on the same side. A plurality of (two in the figure) possible cylindrical portions 6C and 7C are provided. The bolts 8 are inserted into the cylindrical portions 6C and 7C, and the nuts 9 are screwed onto the distal ends of the inserted bolts 8, thereby connecting the pair of expansion operation portions 6 and 7. With this configuration, when the pair of extending portions 6B and 7B approach each other, the pair of fixing portions 6A and 7A are separated from each other, and when the pair of extending portions 6B and 7B are separated from each other, the pair of fixing portions are fixed. The pair of expansion operation portions 6 and 7 can be swung around the bolt 8 so that the portions 6A and 7A approach each other.

  As shown in FIGS. 2A and 2B, the indirect hot wire tool 2 includes a pair of metal gripping portions 10 and 11 that can be freely opened and closed. The pair of gripping portions 10 and 11 is composed of a pair of holding members configured to be able to contact and separate from each other. In addition, one of the gripping portions 10 and 11 constitutes a fixed gripping portion attached to the tip of the fixed rod 12. The other gripping part 11 is attached to the fixed gripping part 10 so as to be swingable around a shaft 13. The other gripping portion 11 is connected to the tip of the operation rod 14 and is always biased to the open side by a spring (not shown). Accordingly, the operating rod 14 is pulled by holding an operating lever (not shown). Thereby, the other gripping portion 11 is swung around the shaft 13, and the pair of gripping portions 10, 11 can be closed. The indirect hot wire tool 2 configured in this way is also referred to as quick.

  In addition, the holding portion 10 on the fixed side of the pair of holding portions 10 and 11 includes a pair of projecting portions 10A and 10A that are bifurcated. The pair of projecting portions 10A, 10A are bent in a U-shape when viewed from the side, and have the same shape and the same size. The inner surfaces of the pair of projecting portions 10A and 10A are connected by a connecting portion 10B. Further, the other gripping portion 11 is configured to have a size capable of entering between the one bifurcated projecting portions 10A and 10A, and is configured as a curved portion that curves outward in a side view. It is comprised from the shape-like insertion part.

  One extension part 6B of the pair of extension parts 6B, 7B is formed of a locking projection that can enter and be locked between the bifurcated protrusions 10A, 10A, and the other extension part 7B. However, it is comprised from the bifurcated protrusion part which inserts and latches the other holding part 11 (insertion part).

  More specifically, as shown in FIGS. 5 and 6, one extending portion 6 </ b> B is a plate-like vertically long shape that extends downward from the lower end of the substantially center in the width direction of one fixing portion 6 </ b> A and curves outward. And a prismatic horizontal portion 6c having a square cross section extending outward in the width direction from the lower end of the curved portion 6b and extending parallel to the longitudinal direction of the protective tube 1. Accordingly, as shown in FIGS. 3A and 5, the pair of projecting portions 10 </ b> A and 10 </ b> A are brought into contact with both ends in the width direction of the horizontal portion 6 c. At this time, a portion of the curved portion 6b enters the bifurcated projections 10A and 10A and is locked (see FIG. 3A). In this state, even if the gripping portion 10 moves in the longitudinal direction of the main body 5, one of the widthwise inner side surfaces 10a, 10a of the bifurcated protrusions 10A, 10A is the widthwise outer side surface of the corresponding curved portion 6b. 6G, 6G (see FIG. 5). This prevents the curved portion 6b, which is partially inserted between the protruding portions 10A and 10A, from being detached from between the protruding portions 10A and 10A.

  As shown in FIGS. 4 and 6, the other extension portion 7 </ b> B is formed of a rectangular and annular ring portion that extends downward from the lower end of the other fixing portion 7 </ b> A and curves outward. The ring portion 7B has a horizontally long horizontal portion 7b having the same width as the fixed portion 7A at the lower end of the fixed portion 7A, and a pair of vertically long curved portions that extend downward from both ends in the width direction of the horizontal portion 7b and bend outward. 7c, 7d, and a pair of horizontal protrusions 7e, 7f extending inwardly approaching each other from the lower ends of the vertically long curved portions 7c, 7d. Therefore, as shown in FIGS. 3A and 4, the other gripping portion (insertion portion) 11 is brought into contact with the pair of horizontal protrusions 7e and 7f. At this time, a part of the insertion part 11 enters between the pair of vertically long curved parts 7c, 7d and is in a lockable state. In this state, even if the gripping part 11 moves in the longitudinal direction of the main body 5, one of the widthwise end faces 11a, 11a of the gripping part (insertion part) 11 is the inner side surface of the vertically long curved part 7c, 7d corresponding thereto. 7D and 7D (see FIG. 4). This prevents the insertion portion 11 that is partially inserted between the vertically long curved portions 7c and 7d from being detached from between the vertically long curved portions 7c and 7d.

  A procedure for expanding the pair of expanded portions 5A and 5B of the protective tube 1 configured as described above with the indirect hot wire tool 2 and inserting the electric wire 3 into the protective tube 1 will be described.

  First, the necessary number of protective tubes 1 and the necessary number of indirect hot wire tools 2 are moved to the vicinity of the electric wire 3 to be mounted. Thereafter, the gripping portions 10 and 11 of the indirect hot-wire tool 2 are locked to a pair of expansion operation portions 6 and 7 respectively provided at three locations of an arbitrary protective tube 1. This work can be performed by two or three workers. Subsequently, by extending the three indirect live tool 2 simultaneously or sequentially so as to close the grips 10 and 11 of the three indirect live tools 2, the extending parts 6 </ b> B and 7 </ b> B come close to each other and the fixed part By separating 6A and 7A from each other, all (three in this case) the expanded portions 5A and 5B are expanded. In this expanded state, the electric wire 3 can be inserted into the protective tube 1 by moving the protective tube 1 toward the electric wire 3 (ascending in FIG. 3B). After the insertion of the electric wire 3, by releasing the hands from the operation levers (not shown) of the three indirect hot wire tools 2, all (here, three) expanding portions 5A, 5B are closed and one The installation work of the protective tube 1 is completed. Subsequently, the second and subsequent protective tubes 1 are sequentially attached in the same manner as described above. Further, the protection tubes 1 are connected to each other as described above every time when the second and subsequent attachments are completed or after all the protection tubes 1 have been installed.

  As described above, in a state where the pair of gripping portions 10 and 11 are locked to the pair of extending portions 6B and 7B, the pair of gripping portions 10 and 11 are closed, thereby making the pair of extending portions 6B and 7B Thus, the pair of grip portions 10 and 11 are not detached (or displaced). Therefore, by closing the pair of gripping portions 10 and 11, the pair of expanding portions 5A and 5B can be reliably expanded. And the force to the side which closes a pair of holding parts 10 and 11 is easy to enter compared with the force to the opening side, and can expand a pair of expansion parts 5A and 5B easily.

  In addition, the protective tube which concerns on this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can change variously.

  For example, the protective tube 1 having a circular cross-sectional shape may be formed in an elliptical shape, a rectangular shape, or a polygonal shape. In addition, although the pair of flange portions 5a and 5b are provided at the slit side end of the main body 5 of the protective tube 1, the protection tube 1 may be configured by only the main body 5 without the pair of flange portions 5a and 5b. In addition, the protective tube 1 is provided with a receiving portion 5C at one end and an insertion portion 5D that can be inserted into the receiving portion 5C at the other end, but the protective tube 1 without the receiving portion 5C and the insertion portion 5D is provided. It may be configured.

  The shape of the pair of extending portions 6B and 7B shown in the above embodiment may be any shape. That is, any shape can be used as long as it can be locked to the pair of gripping portions 10 and 11 of the indirect hot-wire tool 2.

  Moreover, in the said embodiment, it is comprised so that one holding part 10 of an indirect hot-line tool may have a pair of protrusion part 10A, 10A branched in bifurcated shape, and the other holding part 11 may be one fork. A pair of grips that are configured to have the same shape and the same size as shown in FIG. It may be an indirect hot wire tool (so-called “Yatco”) having the portions 15 and 16. In this case, one extending portion 7B shown in FIG. 4 is composed of a pair of expanding operation portions 6 and 7 each having an extending portion 7B having the same shape and the same size. In addition, the other gripping portion 16 is configured to be swingable around a shaft 17 with respect to the gripping portion 15 on one fixed side of the indirect live tool. As described above, by pulling the operating rod 14 with respect to the fixed rod 12, the other gripping portion 16 can be swung around the shaft 17.

  DESCRIPTION OF SYMBOLS 1 ... Protective tube, 2 ... Indirect hot wire tool, 3 ... Electric wire (high voltage electric wire), 4 ... Slit, 5 ... Main body, 5A, 5B ... Expanding part, 5C ... Receiving part, 5D ... Insertion part, 5a, 5b ... collar part, 6, 7 ... expansion operation part, 6A, 7A ... fixing part, 6B ... extension part, 7B ... extension part (ring part), 6C, 7C ... cylindrical part, 6G, 6G ... outer surface, 6b ... curved portion, 6c ... horizontal portion, 7D ... inner surface, 7b ... horizontal portion, 7c, 7d ... vertically long curved portion, 7e, 7f ... horizontal projection, 8 ... bolt (shaft), 9 ... nut, 10 ... gripping 11, gripping part (insertion part), 10 A, projecting part, 10 B, connecting part, 10 a, inner surface, 11 a, both end faces in the width direction, 12, fixing rod, 13, shaft, 14, operating rod, 15, 16 ... gripping part, 17 ... axis

Claims (3)

A cylindrical main body having a pair of expansion portions that can be expanded by a slit formed over the entire length in the longitudinal direction, and a pair of expansion operation portions provided in the pair of expansion portions,
Each of the expanding operation portions includes a fixing portion fixed to the expanding portion, and an extending portion extending from the fixing portion so as to protrude outward with respect to the main body,
The pair of expansion operation portions are connected so that the extension portions approach each other to separate the fixing portions, and the extension portions separate from each other so that the fixing portions approach each other. And
The pair of extending portions are configured to be respectively engageable with a pair of openable and closable gripping portions provided at the tip of the indirect live tool, and in the locked state, by closing the pair of gripping portions, the extension By allowing the protruding portions to approach each other and the fixed portions to be separated from each other, the pair of expanding portions can be expanded to allow insertion of an electric wire into the main body ,
One gripping portion of the pair of gripping portions is constituted by a pair of projecting portions branched in a bifurcated shape, and the other gripping portion has a size capable of entering between the one bifurcated projecting portion. An extension part, and one extension part of the pair of extension parts is constituted by a locking projection that can enter and be locked between the bifurcated projection parts, and the other extension part. 2. A protective tube characterized in that the protruding portion is composed of a pair of projecting portions branched in a bifurcated shape that the insertion portion enters and locks .   The protective pipe according to claim 1, wherein the pair of expansion operation portions are swingably connected around an axis along a longitudinal direction of the main body. The protective pipe according to claim 1 or 2 , wherein the pair of extending portions are configured as curved portions that are curved outward so as to be separated from each other.

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