JPH0993736A - Method of forming joint end of standard-size rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the formation of a joint end by butting a molding jig, which has a diameter a little larger than that of a standard size rod, to the end of this rod, and covering these with a thermoshrinkable tube, and heating them for shrinkage, and then, drawing out the forming jig lastly. SOLUTION: A forming jig 2 has a diameter a litter larger than the diameter of the standard size rod on opposite side to be connected, and it is made of plastic material, aluminum, or the like. The sectional form of this jig 2 is the same as the sectional form of the rod 1 on opposite side to be connected. A thermoshrinkable tube 3 is made of silicon rubber, etc., and at first, it is made in the inner diameter a litter larger than the diameter of the rod 1 and the jig 2. To form the joint end of the rod 1, the jig 2 is butted against the end of the rod 1, and a tube 3 is positioned around the end of the rod 1 and the jig 2, and this is heated for shrinkage, and lastly the jig 2 is pulled out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a joint end portion of a fixed length rod which is wound around an overhead wire or used along the overhead wire.

[0002]

2. Description of the Related Art Generally, a spiral rod is attached to an overhead wire to prevent wind noise caused by wind blowing on the overhead wire (overhead power line, ground wire, etc.) or to prevent snow from accumulating on the overhead wire. Wrapping is done. The spiral rod is of a regular size and is formed in a spiral shape in advance, and the spiral rod is sequentially attached along the longitudinal direction of the overhead wire. The end of a standard length spiral rod can generate corona. Therefore, in order to prevent corona generation from the end of the spiral rod, a method of inserting and connecting the ends of the spiral rod has been proposed (see Japanese Utility Model Publication No. 6-4493).

As a method for inserting and connecting the ends of a regular length spiral rod, conventionally, as described in Japanese Utility Model Publication No. 6-4493, a fitting hole is provided at one end of one spiral rod. A method of providing a small-diameter portion at the end of the other spiral rod and inserting and connecting the small-diameter portion into the fitting hole,
A method is proposed in which a pipe made of aluminum or the like is attached to the ends of a spiral rod to be connected to each other for compression connection, or a method in which a rod-shaped body is inserted into the ends of a spiral rod formed of a pipe to be connected. ing.

[0004]

However, one end of one spiral rod is provided with a fitting hole, the other end of the spiral rod is provided with a small diameter portion, and the small diameter portion is inserted into the fitting hole. In the plug-in connection method, the diameter of the spiral rod is generally as small as about 3 to 10 mm, and there is a problem that the work of providing the fitting hole and the small diameter portion at the end is troublesome. In addition, the method of attaching and connecting a pipe made of aluminum or the like to the end of the spiral rod requires compressing the pipe made of aluminum or the like at the installation site of the spiral rod, which is a troublesome work. there were. Further, the method of inserting and connecting the rod-shaped body at the end of the spiral rod formed of a pipe has a problem that it can be used only when the spiral rod is formed of a pipe.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is easy to manufacture and can be easily connected in the field, and can be easily applied not only to a pipe shape but also to a solid rod. A method for forming a joint end portion of a fixed-length rod that can be applied is provided.

According to the method for forming a joint end portion of a standard length rod according to the present invention, a molding jig having a diameter slightly larger than a diameter of a counterpart standard length rod to be connected to the standard length rod is formed at an end portion of the standard length rod. While abutting the tools, cover the end of the fixed-length rod and the molding jig with a heat-shrinkable tube, and then heat the heat-shrinkable tube to shrink the heat-shrinkable tube, and finally mold the jig. Is a method characterized by pulling out.

If the joint end of the standard length rod is formed by using a molding jig having a diameter slightly larger than the diameter of the partner's standard length rod to be connected and a heat-shrinkable tube, it is easy to form the standard length rod. A joint end can be formed. Also, since the molding jig has a diameter slightly larger than the diameter of the partner's standard length rod to be connected, the inner diameter of the heat-shrinkable tube after pulling out the molding jig is The diameter is slightly larger than the diameter of the standard length rod. Therefore, the end portion of the fixed length rod on the other side can be easily inserted into the position.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. 1 and 2 are explanatory views of a method for forming a joint end portion of a standard length rod according to the present invention, in which 1 is a standard length rod, 2 is a molding jig, and 3 is a heat-shrinkable tube.

The fixed length rod 1 has a fixed length of about 1 to 5 m and is formed in a spiral shape or a straight shape.
This fixed length rod is made of aluminum, an aluminum alloy, a plastic material, a composite material of aluminum and rubber, or the like. Also,
The cross-sectional shape includes a circular cross-section as shown in FIG. 3 (a) and a substantially triangular cross-section as shown in FIG. 3 (b). The sectional shape may be, for example, a pipe shape.

The molding jig 2 has a diameter slightly larger than the diameter of the fixed length rod on the other side to be connected, and is made of a plastic material, aluminum or the like. The cross-sectional shape of this molding jig 2 is the same as the cross-sectional shape of the fixed length rod on the other side to be connected.

The heat-shrinkable tube 3 is made of silicone rubber, polyethylene or the like, and initially has an inner diameter slightly larger than the diameters of the fixed-length rod 1 and the molding jig 2.

Next, a method of forming the joint end portion of the standard length rod will be described. First, the forming jig 2 is butted against the end of the standard length rod 1. Next, the heat-shrinkable tube 3 is positioned at the end of the fixed length rod 1 and the outer periphery of the molding jig 2.
Next, the heat-shrinkable tube 3 is heated to shrink the heat-shrinkable tube. Finally, the molding jig 2 is pulled out.

When the molding jig 2 is pulled out, as shown in FIG. 2, one end of the heat-shrinkable tube 3 is fixed to the end of the standard length rod 1, and the other end of the heat-shrinkable tube 3 is connected. A mating standard rod connecting hole 4 having an inner diameter slightly larger than the diameter of the mating standard rod to be formed is formed.

In the above embodiment, the heat-shrinkable tube 3 is positioned on the outer periphery of the fixed-length rod 1 after the molding jig 2 is butted against the end of the fixed-length rod 1. Alternatively, the molding jig 2 may be placed at the end of the graduated rod 1 and the molding jig 2 may be inserted thereinto and the molding jig 2 may be abutted against the end of the fixed length rod 1.

FIG. 4 shows that the unevenness 5 is provided on the outer periphery of the end portion of the standard length rod 1 where the heat shrinkable tube 3 is located to improve the adhesiveness between the heat shrinkable tube 3 and the standard length rod 1. .

As shown in FIGS. 5 and 6, the standard length rod having the joint end formed as described above has the heat-shrinkable tube 3
In the other side of the other side fixed length rod connection hole 4, the other side fixed length rod 1
A is inserted and connected and is sequentially attached to the outer circumference of the overhead wire 10. Note that FIG. 5 shows the standard rod 1 having a spiral shape, and FIG. 6 shows the standard rod 1 having a linear shape.

When the mating constant length rod 1A is inserted into the mating constant length rod connecting hole 4 of the heat shrinkable tube 3 and is connected, the mating constant length rod 1A is replaced by the heat shrinkable tube 3
In order to prevent the mating side constant length rod connecting hole 4 from slipping out, an adhesive or the like may be applied in advance to the mating side constant length rod connecting hole 4 of the heat-shrinkable tube 3.

[0018]

EXAMPLE A molding jig 2 having a diameter of 7.2 mm and a length of 25 mm is butted to the end of a standard length rod 1 having a diameter of 7 mm and a length of 2.5 m, and the outer circumference thereof has an inner diameter of 7.5 mm and a length of 50 mm.
A heat-shrinkable tube 3 made of ethylene vinyl acetate (EVA) having a thickness of 2 mm and a Vickers hardness of 75 degrees is positioned, after which the heat-shrinkable tube 3 is heated, and finally, the molding jig 2 is pulled out and a joint end portion is drawn out. Was formed. When a mating fixed-length rod with a diameter of 7 mm and a length of 2.5 m was inserted and connected to the joint end, the workability of inserting the mating fixed-length rod and the contact between the heat-shrinkable tube and the fixed-length rod were determined. It was confirmed that there was no problem in terms of the characteristics and corona characteristics.

[0019]

As described above, according to the method for forming a joint end portion of a standard length rod according to the present invention, the end portion of the standard length rod has a diameter larger than that of the other side constant length rod to be connected to the standard length rod. Butt a molding jig with a slightly larger diameter, cover the end of the standard length rod and the molding jig with a heat-shrinkable tube, and then heat the heat-shrinkable tube to shrink the heat-shrinkable tube. Since the method is characterized in that the molding jig is finally pulled out, a joint end portion with the mating fixed length rod can be easily formed at the end portion of the fixed length rod.

The forming jig has a diameter slightly larger than the diameter of the fixed length rod on the other side to be connected, and the inner diameter of the heat-shrinkable tube after pulling out the forming jig is the other side to be connected. Since the diameter is slightly larger than the diameter of the standard length rod, the end portion of the counterpart standard length rod can be easily inserted into this position. Therefore, the work on site becomes easy.

Further, the present invention has an advantage that it can be applied to any shape of the standard length rod.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a manufacturing process of a method for forming a joint end portion of a standard length rod according to the present invention.

FIG. 2 is a cross-sectional view showing a manufacturing process of a method for forming a joint end portion of a standard length rod according to the present invention.

3 (a) and 3 (b) are different sectional views of a fixed-length rod end portion.

FIG. 4 is a cross-sectional view showing a modified example of a connecting portion between a standard length rod and a heat-shrinkable tube.

FIG. 5 is an explanatory diagram showing a spliced state when the standard length rod has a spiral shape.

FIG. 6 is an explanatory diagram showing a spliced state when the standard length rod is linear.

[Explanation of symbols]

 1 fixed length rod 2 forming jig 3 heat shrinkable tube 4 mating side fixed length rod connection hole 5 uneven part 10 overhead wire

Claims (1)

[Claims] 1. A molding jig having a diameter slightly larger than the diameter of a mating measuring rod to be connected to the measuring rod is butted against the end of the measuring rod, and the end of the measuring rod and A fixed length rod covering the outer peripheral surface of the molding jig, covering it with a heat-shrinkable tube, heating the heat-shrinkable tube to shrink the heat-shrinkable tube, and finally withdrawing the molding jig. Method for forming joint end part.