JP3011894B2 - Pipe fitting and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various pipe structures, for example, a pipe assembly type shelf, a pipe assembly type table,
The present invention relates to a pipe fitting used for a pipe joint such as a dome-shaped ceiling frame or a scaffold frame at a construction site, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, there has been a method of directly welding pipe ends when connecting pipes oriented in various directions at one place. However, in order to keep assembly accuracy and strength high, welding is required. The work is very laborious and requires skill. In particular, when pipes cross each other at various angles other than a right angle, welding work on site becomes very difficult.

[0003] On the other hand, if a joint fitting having a plurality of joints in an octopus-like shape is used, the assembling work on site becomes easy. Such a fitting includes a plurality of pipe-shaped joints integrally, and an inner fitting method in which an end of each pipe connected to the inner periphery of the pipe-shaped joint is inserted, or a connection center as shown in FIG. There is an external fitting method in which a spherical portion 30 is provided on the portion, a plurality of columnar projections 31 are integrally provided on the surface of the spherical portion 30, and an end of the pipe P is fitted on the outer periphery of each projection 31.

[0004]

In the inner fitting method using a pipe-shaped joint, the entire fitting is exposed to the outside even after the assembly, so that a material suitable for the pipe to be joined is used or the color tone is changed. And it is troublesome and costly to process the joint fitting. In addition, skill is required to weld a large number of pipe-shaped joints radially about one joint center, and it is difficult to correct distortion during welding and manufacture the joints accurately. Further, it is conceivable that the inlet opening of the pipe-shaped joint hits a container or the like during storage or transportation, and the inlet opening is deformed so that the pipe cannot be inserted.

In the external fitting method shown in FIG. 7, since the pipe P is fitted over the entire length of each projection 31, the projection 31 is used to improve the support strength of the pipe P.
When the length is increased, the entire length of the fitting portion is extended, so that it becomes difficult to fit the pipe. That is, the workability of assembling the pipe P is reduced. On the other hand, if the projections 31 are shortened in order to improve the assembling workability, a problem occurs in the support strength.
Further, since the spherical portion 30 is exposed to the outside even after assembly, it is necessary to use a material suitable for the pipe or to adjust the color tone.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to assemble a large number of pipes and set the crossing angle between the pipes at 9
It is an object of the present invention to provide a pipe fitting and a method for manufacturing the same, which can maintain sufficient assembly workability and strength even at angles other than 0 ° and are easy to manufacture.

[0007]

In order to achieve the above-mentioned object, a connecting fitting according to the first aspect of the present invention includes a cylindrical fitting portion fitted on an inner peripheral surface of a pipe to be connected. A plurality of insertion supports integrally having a support handle portion having a smaller outer diameter than the portion and extending toward the connection center, and each insertion support is connected so as to project from the connection center in a predetermined direction. It is characterized in that it is welded integrally at the center portion, and a screw hole or a screw insertion hole for fixing a pipe is formed in each fitting portion.

According to a second aspect of the present invention, in the pipe fitting of the first aspect, the length of some or all of the support handles is different.

According to a third aspect of the present invention, there is provided a method for manufacturing a pipe fitting, comprising: a cylindrical fitting portion fitted to the inner peripheral surface of the pipe; and a support handle portion having an outer diameter smaller than the fitting portion. And a plurality of insert supports each having a conical portion formed at the tip of the support handle portion are formed and processed, and the conical tip of each support handle portion is aligned with the coupling center, and each insert support is oriented in a predetermined direction. And the conical portions are joined by welding.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a plan view of a pipe fitting to which the present invention is applied, in which seven pipes P (P1, P2,..., P7) arranged three-dimensionally are arranged in one place. For joining.

The fitting 1 is composed of seven insertion supports 2 linearly extending from the connection center O in predetermined directions, respectively, which are integrally welded at the connection center. Each insertion support 2 has a cylindrical fitting portion 5 having a diameter that fits into the inner peripheral surface of each pipe P, and is formed integrally with the fitting portion 5 and extends toward the connection center O. The support handle 6 is made of, for example, an aluminum alloy. The supporting handle 6 has the same axis C1 as the fitting portion 5.
It is formed at the top and its diameter is smaller than the diameter of the fitting part 5, and while the diameter of the fitting part 5 is about ／, for example, 32 mm, The diameter of the handle 6 is set to 20 mm.

Although the length of the fitting portion 5 of each insertion support 2 is set to a uniform size (for example, 50 mm), the length of the support handle 6 of each insertion support 2 is And the arrangement density of the insertion support 2 and the like. For example, if the mating pipe is long, the support handle 6 may be lengthened, or if the fitting portions are close to each other, the distance from the coupling center O to each fitting portion 5 may be varied. The length of each support handle 6 is different. On the outer peripheral surface of the fitting portion 5, screw holes 12 for pipe fixing are formed at appropriate intervals in the axial direction. The screw holes 12 may be formed in only one pair on one surface of the fitting portion 5 as shown in the figure, or may be formed in one pair on both side surfaces.

The distal end face of each pipe P has an appropriate shape such as an inclined shape or an arc shape so that the distal end face (cut surface) of the pipe P to be assembled later matches the outer peripheral surface shape of the previously assembled pipe P. When the assembly is completed, each pipe P completely covers the support handle 6 and the coupling center portion, and the pipe P assembled later covers a part of the pipe P assembled earlier. It has become. For example, the leading edges of a pair of upper and lower pipes P1 and P2 at the center of the left and right widths to be assembled first are formed linearly so that the upper and lower leading edges abut each other, and both right and left sides are cut off in an arc shape. And it is formed in an arc shape as viewed from the side so as to cover the coupling center O. The pipe P3 to be assembled next covers a part of the pipe P1 and is formed into a curved surface or an inclined surface that matches the outer peripheral surface of the pipe P1, and the pipes P4 and P5 to be assembled next are a part of the pipe P2 and the pipe P2. A curved or inclined surface is formed to cover a part of P3 and to match the outer peripheral surfaces of the pipes P2 and P3. Remaining pipes P6, P7
Are also cut so as to sequentially cover a part of the pipes of the preceding set and to match their outer peripheral surfaces.

The pipe assembling operation will be briefly described. First,
The pipes P1, 2 are fitted around the outer periphery of the corresponding insertion support 2, and are fixed by screws 13 as shown in FIG. At this time, each of the pipes P1, 2 is fixed in a state where it is supported at two positions, that is, a tip end and a fitting portion 5 which is at an appropriate distance from the tip end.

Next, the pipes P3, 4, 5, 6, 7 are sequentially fitted so as to cover a part of the pre-assembled pipe and match the outer peripheral surface of the pre-assembled pipe. Finally, the connection fitting 1 is connected while being completely covered by the entire pipes P. Further, the pipes are firmly connected with the end portions sequentially overlapping.

Next, a method of manufacturing the fitting 1 will be described. As shown in FIG. 3, a predetermined number of insertion supports 2 each having a fitting portion 5 having the same length and a support handle portion 6 having various lengths are coaxially integrated, and are processed and aligned. A conical portion 10 is formed at the distal end of the support handle 6 of the insertion support 2, and a screw hole 12 is formed in the fitting portion 5.

The tip of the conical portion 10 of each insertion support 2 is aligned with the connection center O, and each insertion support 2 is oriented in a predetermined direction, and the angle is manually corrected by an operator by spot welding or the like. The bonding center O portion is temporarily bonded with a possible strength.

After the temporary welding, the posture of each insertion support 2 is finally corrected, and the joint between the conical portions is strongly welded firmly by beam welding or the like.

An example of a method for cutting the tip of each pipe will be briefly described. As shown in FIG. 6, a film 21 is wound around the end of the uncut gauge pipe 20 in a projecting manner at the tip thereof, and the film 21 is wound along the curved surface 23 with the outer peripheral surface of the mating pipe P using a cutter knife. cut out.

The cut film 21 is drawn into the gauge pipe 20 as it is, the cut curved surface 23 of the film 21 is transferred to the surface of the gauge pipe by a punch, and the gauge pipe 21 is shaved. Finish the cut surface shape.

The pipe 20 is processed by using the gauge pipe 20 as a copying gauge.

[0022]

[Other embodiments]

(1) FIG. 4 shows a modification of the insertion support 2,
This is an example in which a support handle 26 of another insertion support 22 is integrally welded in the middle of the support handle 6 of one insertion support 2. Although the tip of the support handle 26 on the branch side is curved, the fitting portion 25
The axis C2 of the main part of the support handle 26 is disposed so as to face the coupling center O. In addition, both fitting portions 5, 25
The fitting portion 25 on the branch side is located closer to the coupling center O than the fitting portion 5 on the trunk side so that they do not interfere with each other.

(2) As shown in FIG. 5, instead of forming a screw hole in the fitting portion 5, a screw insertion hole 28 penetrating in the radial direction is formed.
On the other hand, screw insertion holes 29 corresponding to both ends of the screw insertion hole 28 are also formed in the pipe P, and a long bolt 27 is formed.
May be penetrated through the pipe P and the screw insertion holes 29, 28 of the fitting portion 5 and fastened and fixed by the nut 29a.

[0024]

【The invention's effect】

(1) As described above, the pipe fitting according to the present invention has a cylindrical fitting portion 5 fitted to the inner peripheral surface of the pipe P to be joined, and an outer diameter smaller than the fitting portion 5. A plurality of insertion supports 2 integrally having a support handle 6 extending toward the connection center are provided, and each insertion support 2 is provided with a connection center O
Are welded together at the center of the connection so as to project in a predetermined direction from each other, so that each pipe P is fitted to each insertion support 2 and screwed, so that it is simple and accurate, and The pipes can be firmly connected at one place.

(2) Since the entire joint can be covered by the pipe P to be joined, there is no need to consider the color and decoration of the surface of the joint itself, and the processing cost of the joint can be reduced.

(3) Since the insertion support 2 is composed of the fitting portion 5 and the support handle portion 6 having an outer diameter smaller than the fitting portion 5, each pipe P is formed by the fitting portion 5 and the fitting portion. 5 is supported at two points by the tip of the pipe distant from the pipe 5, thereby increasing the supporting strength. On the other hand, the length of the portion actually fitted to the inner peripheral surface of the pipe P is Since the length is limited to the length, the assembling workability when fitting the pipe to the insertion support 2 is improved.

(4) If the length of each support handle 6 is changed as in the second aspect of the present invention, the number of insertion supports 2 increases, and the insertion supports 2 are arranged close to each other. However, the positions of the fitting portions 5 can be shifted from each other by a difference in distance from the coupling center, which is useful for improving the assembling workability. Also, depending on the length of the corresponding pipe, the supporting handle 6
By changing the length, it is possible to maintain the supporting strength according to the pipe length, which is convenient.

(5) As a method of manufacturing the coupling fitting, a plurality of insertion supports 2 having a conical portion 10 formed at the tip of the support handle 6 are prepared, the tip of the conical portion is aligned with the coupling center, and each of the insertion supports is adjusted. 2 are arranged in a predetermined direction,
Because the conical parts are joined by welding,
Even with a plurality of insertion supports 2 oriented in various directions,
It can be easily set and combined according to two coupling centers. In particular, even when the pipes have a complicated angular relationship other than 90 °, the insertion supports can be welded easily and accurately.

[Brief description of the drawings]

FIG. 1 is a plan view of a fitting to which the present invention is applied.

FIG. 2 is a plan view of the same coupling fitting as in FIG. 1, showing a state when the pipe is assembled.

FIG. 3 is a plan view showing a step in the middle of the manufacturing method according to the present invention.

FIG. 4 is a plan view showing a modification of the insertion support.

FIG. 5 is a cross-sectional view showing a modification of the fitting portion.

FIG. 6 is a front view showing a gauge forming step in the method for manufacturing a fitting.

FIG. 7 is a plan view of a conventional example.

[Explanation of symbols]

 2 insertion support 5 fitting part 6 support handle 10 conical part 12 screw hole 28 screw insertion hole

Claims (3)

(57) [Claims] 1. An insertion integrally having a cylindrical fitting portion fitted to the inner peripheral surface of a pipe to be connected and a support handle portion having a smaller outer diameter than the fitting portion and extending toward the connection center. A plurality of supports are provided.Each of the insert supports is integrally welded at the center of the joint so as to project from the center of the joint in a predetermined direction. A pipe fitting, wherein a hole is formed. 2. The pipe fitting according to claim 1, wherein some or all of the supporting handle portions have different lengths. 3. A cylindrical fitting portion fitted to an inner peripheral surface of a pipe and a support handle portion having an outer diameter smaller than the fitting portion are integrally formed, and a conical portion is formed at a tip of the support handle portion. Of the insert supports made of a plurality of inserts, aligning the tips of the conical portions of each support handle with the connection center, arranging each insert support in a predetermined direction, and connecting the conical portions by welding. A method of manufacturing a pipe fitting.