JP2002005363A - Connecting device for pipes of different diameters - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting device of pipes of different diameters allowing an easy connecting work only by fitting, and finishing into neat appearance without generation of a projecting part at the outside of a connecting part and without intrusion of rainwater. SOLUTION: A tapered part 14 and a small diameter cylinder part 15 are successively formed at an upper end part of a joint pipe 13. An elastic locking piece 16 and a cut-out 17 for positioning to be opened at an upper end of the small diameter cylinder part 15 are provided on a peripheral wall of the small diameter cylinder part 15. A tapered ring 22 which has an inside diameter adapted to an outside face of the tapered part 14 and becomes a falling preventing state due to engagement to a lower end of the elastic locking piece 16 by being fitted into the tapered part 14 and a positioning pin 23 engaged to the cut-out 17 for positioning are fixed to an inner peripheral surface of an upper column 12 fitted externally and inserted into the joint pipe 13. The joint pipe 13 and the upper column 12 can be connected by only fitting and pushing operations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for connecting large-diameter pipes and small-diameter pipes in the axial and radial directions, and more particularly to a town formed by a combination of large-diameter pipes and small-diameter pipes. The present invention relates to an effective connecting device for use in assembling a pole for a street light.

[0002]

2. Description of the Related Art A pole for a street light is a long pipe structure, but if it is formed by a single pipe, not only material waste but also an extremely large space for stock is required. Because transport also costs money, the pole is divided into a large-diameter lower pillar and a small-diameter upper pillar, and this is connected locally to assemble the pole.
Adopting such an assembly by connection has the advantage that material waste can be reduced, space can be saved when stocking, and transport costs can be reduced.

FIG. 5 shows a connection structure between a large-diameter lower column 1 and a small-diameter upper column 2 in a conventional pole. An annular plate 3 is welded inside the upper end of the lower column 1 and the lower end is attached to the annular plate 3. The fitted joint pipe 4 is projected above the lower column 1 in a coaxial arrangement, and then the upper end of the lower column 1 is reduced in diameter by drawing to join the upper end opening to the outer periphery of the joint pipe 4. With the joint cover 5 externally fitted to the joint pipe 4 positioned at the upper end of the lower column 1, the upper column 2 was externally inserted into the joint pipe 4, and the lower end of the upper column 2 was fitted to the joint cover 5. In this state, the upper column 2 and the joint pipe 4 are connected from outside of the upper column 2 by screwing a plurality of set bolts 6 to connect the lower column 1 and the upper column 2 in the axial direction and the radial direction.

[0004]

In the conventional connection structure as described above, the joint cover 5 and the set bolt 6 can be seen from the outside, and not only the appearance is not good in appearance but also the set bolt 6 Screwing work is required, and connection is time-consuming.

In addition, since the lower end of the upper column 2 is fitted to the joint cover 5 placed on the lower column 1 and the set bolt 6 is screwed from outside the upper column 2,
There is also a problem that rainwater penetrates into the inside of the pole from these portions, and the inside of the pole is corroded.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a connection operation which can be easily carried out only by fitting, has no protruding portion outside the connection portion, is finished in a neat external appearance, and is excellent in waterproofness. Another object of the present invention is to provide a connecting device for pipes of different diameters, which does not allow rainwater to enter inside.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tapered portion having a small diameter toward the upper end of a small diameter pipe, and a small diameter cylinder connected to the upper end of the tapered portion. An elastic locking piece whose lower part protrudes outwardly on the peripheral wall of the small-diameter cylindrical portion, and a positioning notch for opening at the upper end of the small-diameter cylindrical portion are provided, and are fitted into the small-diameter pipe. The inner peripheral surface of the large-diameter pipe has a tapered inner diameter that matches the outer surface of the tapered portion. And a positioning pin which is engaged with a notch for positioning and which is fixed to a taper ring which is engaged with a lower end of the groove to be in a retaining state.

The large-diameter pipe is a pole for a street light, the small-diameter pipe serves as a mounting pipe for erecting the pole on the ground, the small-diameter pipe is fixed upright on a base plate, and the large-diameter pipe is tapered. With the ring fitted to the tapered part of the small diameter pipe, make the lower end abut on the base plate, or expand the lower end side of the mounting pipe, and lower the outer end to the upper end of this enlarged diameter part. The tapered surface provided at the lower end of the pole can be brought into contact with the tapered step in a state where the tapered step is formed and the taper ring is fitted into the tapered part of the mounting pipe.

The lower end of the small-diameter pipe is enlarged in diameter, and a tapered step is formed at the upper end of the enlarged-diameter portion so as to be inclined outward and inclined. Can be formed into a tapered surface that fits into the tapered step with a cushion material interposed therebetween.

Further, the large-diameter pipe is an upper column of the pole, and the small-diameter pipe is a joint pipe connecting the lower column and the upper column of the pole, and an annular plate for press-fitting the lower end of the small-diameter pipe inside the lower column. May be fixed, and a position below the tapered step of the small-diameter pipe may be welded to the upper end opening of the lower pillar whose diameter has been reduced by drawing.

As described above, connection can be made simply by inserting a large-diameter pipe into a small-diameter pipe, and since there is no projecting portion outside the connection portion and fixing with bolts is not required, waterproofness is obtained. Is also excellent.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows a state in which the connecting device of the present invention is used for connecting a street light pole. The first embodiment of FIGS. 2 and 3 shows a lower pole and an upper pole of a pole. The lower pillar 11 is a large-diameter pipe,
The upper column 12 is formed using a pipe having a smaller diameter.

In the connection device described above, the joint pipe 13 connecting the lower column 11 and the upper column 12 corresponds to the small-diameter pipe of the present invention, and the upper column 12 corresponds to the large-diameter pipe.

The joint pipe 13 has a sufficient length in the vertical direction and an outer diameter that is compatible with the inner diameter of the upper column 12. The small-diameter cylindrical portion 15 connected to the upper end of the small-diameter cylindrical portion 15 is coupled by drawing, and a portion surrounded by an upward U-shaped cut is formed on the peripheral wall of the small-diameter cylindrical portion 15 so that the lower portion projects outward. An elastic locking piece 16 of
A positioning notch 17 that opens at the upper end of the small-diameter cylindrical portion 15 is provided.

The lower end side of the joint pipe 13 is formed into a large-diameter portion 18 by expanding the diameter, and a tapered step portion 19 is formed at the upper end of the large-diameter portion 18 so as to fall outward and be inclined.

The inner peripheral surface of the upper column 12 has a tapered portion 14
A cylindrical wall 20 is provided on the outer periphery of the upper part, and a tapered ring 22 having a step 21 formed on the inner periphery of the lower end of the cylindrical wall 20 is fixed by welding.

When the upper column 12 is fitted into the joint pipe 13, the tapered ring 22
Is fitted in the small-diameter cylindrical portion 15 of the joint pipe 13 and moves in the axial direction, passes through the small-diameter cylindrical portion 15 while pushing in the elastic locking piece 16 with the inner diameter of the taper ring 22, and fits in the taper portion 14. By doing so, the step portion 21 is engaged with the lower end of the elastic locking piece 16 to be in a state where it cannot be removed.

A notch 1 for positioning is formed on the inner peripheral surface of the upper column 12 when it is inserted into the joint pipe 13.
7 is fixed and the notch 1 is fixed.
7 and the pin 23 and the upper column 12 and the joint pipe 1
3 is prevented from occurring.

An annular plate 24 for press-fitting the lower end of the large-diameter portion 18 of the joint pipe 13 is fixed to the inside of the lower column 11 to which the joint pipe 13 is fixed by welding. In a state where the lower end of the portion 18 is pressed in, the upper end opening of the lower column 11 whose diameter has been reduced by drawing is welded to a position below the tapered step portion 19 of the joint pipe 13, thereby forming the joint pipe 1.
Numeral 3 is fixed to the upper end of the lower pillar 11 in an extended manner in a coaxial arrangement.

The upper column 12 has a length from the fixed portion to the lower end of the tapered ring 22. The tapered ring 22 is fitted into the tapered portion 14 of the joint pipe 13, and the lower end of the upper column 12 The lower end is formed on a tapered surface 26 that fits the tapered step portion 19.

The second embodiment shown in the lower half of FIG. 1 (A) is an example in which a lower pole 11 of a street light pole is used for connection to stand on the ground. In the second embodiment, the small-diameter pipe referred to in the present invention serves as an attachment pipe 31 for erecting the pole on the ground, and the large-diameter pipe serves as the lower pillar 11. Note that the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The mounting pipe 31 has an outer diameter adapted to the inner diameter of the lower column 11, and has a tapered portion 14, a small-diameter cylindrical portion 15, a plurality of elastic locking pieces 16, and a notch 17 for positioning at the upper end. The mounting pipe 31 is provided upright on the base plate 32.

A taper ring 22 and a pin 23 for positioning are fixed to the inner periphery of the lower end of the lower column 11, and the lower column 11 is inserted into the mounting pipe 31 so that the taper ring 22 is fitted to the tapered portion 14 of the mounting pipe 31. In the fitted state, the lower end is in contact with the base plate 32.

FIG. 1B shows another example of the lower end structure of the lower column 11 and the mounting pipe 31. An enlarged diameter portion 36 is provided at the lower end side of the mounting pipe 31 for fixing to the base plate 32. A taper step 37 is formed at the upper end of the portion 36 to be inclined downward and inclined outward, and the taper surface 38 provided at the lower end of the lower pillar 11 is tapered while the taper ring 22 is fitted into the taper portion 14 of the mounting pipe 31. It is in contact with the step portion 37.

The base plate 32 is fixed to the ground with anchor bolts. FIG. 4B shows a state in which the lower column 11 is connected to the mounting pipe 31 in order to improve the standing strength of the lower column 11. 11 shows an example in which 11 and a base plate 32 are fixed by a plurality of brackets 33.

FIG. 4C shows a pipe 34 embedded in the ground on the lower surface of the base plate 32 in order to improve the fixing strength of the base plate 32 to the ground.
An example is shown in which a plurality of brackets 35 are provided between the lower bracket and the lower surface of the base plate 32.

The connection device according to the present invention has the above-described configuration. Next, the lower column 11 will be described by taking the first embodiment as an example.
A method of connecting the upper column 12 and the upper column 12 will be described.

A joint pipe 13 is fixed to the upper end of the lower column 11 in advance in a coaxial arrangement so as to be extended.
In order to connect the upper column 12 to 1, the lower end of the upper column 12 is inserted into the joint pipe 13. At this time, the upper pillar 12
Pin 23 and joint pipe 1 provided on the inner surface of
The phases of the positioning notches 17 of 3 are matched.

When the upper column 12 is inserted into the joint pipe 13, the tapered ring 22 fits into the small-diameter cylindrical portion 15 provided at the upper end of the joint pipe 13, and when the upper column 12 is pushed in, the inner periphery of the tapered ring 22 becomes elastic. When the stop piece 16 is pushed back inward, it passes through the small-diameter cylindrical portion 15 and the inner periphery of the tapered ring 22 passes through the lower end of the elastic locking piece 16.
Of the elastic locking piece 16
Protrudes outward with restoring elasticity, and its lower end is tapered ring 2
The second step 21 is engaged.

When the tapered ring 22 is fitted into the tapered portion 14 of the joint pipe 13, the positioning pin 23
Are fitted in the notches 17 for positioning, whereby the lower column 11 and the upper column 12 are connected coaxially in a vertically stopped state and a detented state.

When the lower column 11 and the upper column 12 are connected, the lower end tapered surface 25 of the upper column 12 is pressed into contact with the tapered step portion 19 provided below the joint pipe 13 via the cushion material 25 to provide a waterproof state. It has become.

As described above, the connection between the lower column 11 and the upper column 12 can be achieved simply by inserting the upper column 12 into the joint pipe 13 and pushing it in. In the connected state, the lower column 11 and the upper column 1 are connected.
There is no projecting portion on the outer surface of No. 2 to give a clean appearance, and since there are no screw holes or gaps on the outside, the waterproofness is excellent.

The connection between the lower pillar 11 and the mounting pipe 31 can be performed by the same operation as described above.

[0035]

As described above, according to the present invention, a tapered portion and a small-diameter cylindrical portion are coupled to the upper end of the small-diameter pipe, and the elastic locking piece whose lower portion projects outwardly from the peripheral wall of the small-diameter cylindrical portion. A notch for positioning is provided at the upper end of the small-diameter cylindrical portion, and a notch for positioning is provided on the inner peripheral surface of the large-diameter pipe to be inserted into the small-diameter pipe. Since the positioning pin that engages the notch is fixed, it is possible to connect the small-diameter pipe and the large-diameter pipe vertically and coaxially in a state that prevents them from falling off and rotating by simply inserting and pushing the large-diameter pipe into the small-diameter pipe. Not only can the connection work be performed easily, but there is no protrusion on the outer surface,
Since there is no screw hole or gap outside as well as the appearance is improved, a connection excellent in waterproofness can be obtained. For example, it is extremely useful for connecting a pole for a street light exposed to the weather.

[Brief description of the drawings]

FIG. 1A is a vertical sectional front view showing a state in which a connecting device of the present invention is used for connecting a street light pole, and FIG. 1B is a vertical sectional front view showing another example of a lower pillar and a lower end structure of a mounting pipe. Figure

FIG. 2 is an exploded perspective view showing a connection structure between a joint pipe and an upper column according to the first embodiment of the connection device.

FIG. 3 is an enlarged vertical sectional front view showing a state where the joint pipe and the upper column are connected to each other.

FIG. 4A is a perspective view showing a connection state between a mounting pipe and a lower column according to a second embodiment of the connection device, and FIG. 4B is provided with a plurality of brackets between the lower column and a base plate in the same embodiment. (C) is a perspective view of an example in which a bracket is provided on the lower surface of the base plate.

FIG. 5 is a longitudinal sectional view showing a conventional connection device for a street light pole.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Lower pillar 12 Upper pillar 13 Joint pipe 14 Tapered part 15 Small diameter cylindrical part 16 Elastic locking piece 17 Notch for positioning 18 Large diameter part 19 Tapered step 20 Tube wall 21 Step 22 Tapered ring 23 Positioning pin 24 Ring plate 25 Waterproof cushion material 26 Tapered surface 31 Mounting pipe 32 Base plate 33 Bracket 34 Pipe 35 Bracket

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H016 DA03 3J106 AB01 BA01 BB01 BC04 BD01 BE29 BE40 EA03 EB03 EC01 EC06 ED02 ED05 EE02 EF04 EF05

Claims (5)

[Claims] 1. An upper end of a small-diameter pipe is coupled with a tapered portion having a smaller diameter toward the upper side and a small-diameter cylindrical portion connected to an upper end of the tapered portion. A protruding elastic locking piece and a notch for positioning opened at the upper end of the small-diameter cylindrical portion are provided. The inner peripheral surface of the large-diameter pipe inserted into the small-diameter pipe is tapered to fit the outer surface of the tapered portion. A taper ring having an inner diameter of 弾 性, which is pushed into the small-diameter cylindrical portion while being pushed into the tapered portion to engage with the lower end of the elastic locking piece so as to be in a retaining state; A connecting device for pipes of different diameters, in which a positioning pin that engages with the notch of the pipe is fixed. 2. The large-diameter pipe is a pole, and the small-diameter pipe is a mounting pipe for erecting the pole on the ground. The mounting pipe is fixed on a base plate. The connecting device for a pipe of different diameter according to claim 1, wherein a lower end of the connecting portion is in contact with the base plate in a state of being fitted to the portion. 3. The lower end side of the mounting pipe is expanded in diameter,
A tapered step is formed at the upper end of the enlarged diameter portion so as to be inclined downward and inclined outward, and the tapered surface provided at the lower end of the pole abuts the tapered step with the taper ring fitted into the tapered portion of the mounting pipe. The connecting device for a different diameter pipe according to claim 2, wherein 4. A small-diameter pipe having a tapered step formed by expanding the lower end side of the small-diameter pipe so as to be outwardly inclined at the upper end of the large-diameter pipe. 2. A tapered surface which fits the tapered step portion through a cushion material in a state of being fitted to the tapered portion.
The connecting device for pipes of different diameter according to 1. 5. The small-diameter pipe is a joint pipe connecting a lower pillar and an upper pillar of the pole, and the large-diameter pipe is an upper pillar of the pole, and a lower end of the small-diameter pipe is press-fitted into the lower pillar. 5. The connecting device for a pipe of a different diameter according to claim 4, wherein the plate is fixed, and a position below the tapered step of the small diameter pipe is welded to an upper end opening of the lower pillar whose diameter is reduced by drawing.