JPH0321577Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention [Field of Industrial Application] The present invention relates to a metal pipe joint pole used for, for example, installing temporary power drop-in lines for construction work.

[Conventional technology]

Power drop-in line attachment poles for construction work are removed once the construction work is complete and are used many times. Therefore, it is common practice to divide the pole into two lengths of about 3 meters each on the top and bottom for convenient transportation, lay it on the ground at the construction site, connect the two poles, and then put it in a hole and stand it up.

[Problem that the invention attempts to solve]

However, since the joint between the upper and lower pipes is approximately 2 meters above the ground, it takes a lot of physical strength to remove the upper pipe, which weighs approximately 15 kg, from the lower pipe, and there is a risk of the pipe accidentally falling toward the building. This is a job that requires a lot of care.

The object of the present invention is to provide a joint pole that eliminates the above-mentioned problems.

B. Structure of the invention [Means for solving the problem] Namely, the upper part of the lower pipe 2 made of steel pipe is reduced in diameter, and the upper pipe made of aluminum 1 is loosely fitted on the outside of the reduced diameter part 2a. Connecting bolt 3 horizontally to the fitting part
through the stepped nut 4, and screw the stepped nut 4 into the stepped part 4.
1, the lower tube 2 is pushed toward the head 3a side of the bolt 3 and fixed eccentrically to the inner surface of the upper tube.

[Effect]

Fit the aluminum upper pipe 1 to the outside of the reduced diameter part 2a at the top of the steel pipe lower pipe 2, tighten it with the connecting bolt 3 and stepped nut 4, and move the inner lower pipe 2 to the bolt head 3a side. Since it is made eccentric and brought into close contact with the inner surface of the upper tube 1, looseness due to the fitting gap is eliminated. The lower part of the lower pipe is used by burying it approximately 1 m underground E. When removing the upper pipe, remove the bolts 3 and nuts 4 and pull the upper pipe 1 upward from the lower pipe 2. It is made of aluminum and is lightweight, making it easy to work with.

〔Example〕

In the illustrated example, the lower tube 2 is made of a galvanized steel tube having a larger diameter than the upper tube 1, and the upper tube 2a thereof is formed to have a slightly smaller diameter than the inner diameter of the upper tube 1.

Then, the bolt 3 is passed through the coupling holes 5 and 6 provided in the upper and lower pipes 1 and 2, and its head 3a is inserted into the washer 7.
The upper tube 1 is brought into contact with the outer peripheral surface of the upper tube 1 via. Natsuto 4
is integrally provided with a small-diameter stepped portion 41, the nut hole 5 of the upper tube 1 is sized to allow the stepped portion 41 to pass through, and the front surface 41a of the stepped portion 41 is brought into contact with the outer peripheral surface of the lower tube 2. be.

C. Effect of the invention In the present invention, the upper pipe 1 is made of aluminum as described above, so the weight is about 5 kg, which is about 1/3 of that of a steel pipe. Therefore, it becomes easy to pull out the upper tube 1 from the lower tube 2 while it is standing upright.

In addition, a stepped nut 4 for connection is used to connect the reduced diameter part 2 of the lower pipe 2.
Since a is pushed toward the bolt head side of the upper tube 1 and brought into close eccentric contact, the connection is strong without rattling.

Furthermore, during transportation and storage, the upper tube 1 is fitted and stored in the lower tube 2 from the lower end side, and is integrated into a small volume, which does not take up bulk and is convenient for handling.

[Brief explanation of the drawing]

FIG. 1 is a front view of the joint pole of the present invention, and FIG. 2 is a partially cutaway front view of the joint portion thereof. 1 is an upper pipe, 2 is a lower pipe, 2a is a reduced diameter portion, 3 is a connecting bolt, 4 is a stepped nut, and 41 is a stepped portion.

Claims (1)

[Scope of utility model registration request] The upper part of the steel lower pipe is reduced in diameter, the aluminum upper pipe is loosely fitted to the outside of the reduced diameter part, the connecting bolt is passed through the fitted part laterally, and the stepped nut is screwed. Then, at that stepped part, the lower tube is pushed toward the head of the bolt, and the joint pole is fixed eccentrically to the inner surface of the upper tube.