JPS58184307A - Method of connecting pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe connection method for connecting square pipes used for assembly furniture, product display shelves, etc., and in particular between a square pipe and a cylindrical insertion part of a pipe joint. The present invention relates to a pipe connection method that uses a jig for press-joining the two in the space created by the two.

Traditionally, pipe members have been widely used for assembly furniture, product display shelves, and the like. What is the pipe connection method for connecting these pipe members for assembly?

Make the outer diameter of the insertion part of the pipe joint slightly wider than the hollow inner diameter of the pipe member, and firmly drive the pipe joint into the pipe member, or add various ridges or protrusions to the insertion part of the pipe joint. After forming and inserting the pipe joint, the pipe member is rotated to firmly fit the pipe joint and the pipe member.

However, the method of driving pipe fittings into pipe members utilizes the slight difference between the diameter of the hollow part of the pipe and the outer diameter of the insertion part of the pipe fitting, which results in precision machining of the pipe member and the insertion part of the pipe fitting. was required. In addition, because the pipe joint is driven so strongly, if the pipe joint insertion part is made of plastic, it may be scraped, or if the insertion part is metal, the vibrator is strongly pressed and joined, causing the fitting part to deform and bulge. It was no longer suitable for reuse.

In addition, in the conventional method of rotating and fixing a square pipe member, for example, as shown in Japanese Patent Publication No. 4B-38393, the corner of the prismatic insertion part of a pipe joint is cut into a circular shape, and the square pipe member is rotated. When this was done, the circular corner portion moved from the corner of the square pipe member to the flat part and pressed against the abdomen, thereby joining the square pipe members. With this method, it is undeniable that the square pipe becomes somewhat rounded. However, in order to prevent it from becoming extremely rounded,
Accuracy was required between the inner diameter of the pipe member and the outer diameter of the pipe joint insertion portion.

Furthermore, if the pipe joint is made of plastic, there is no strict requirement for precision, but even if it is easy to insert, it is likely to rattle during use.

Many of them are not suitable for practical use.

Further, the joining member is made of plastic.

There is also a method in which joining members are fitted into all four corners of a square pipe member, but as mentioned above, since they are made of plastic, they tend to wobble after assembly, making them unsuitable for actual use.

In addition, in this type of connection method, 1) Since the joining members are integrally formed, rotational joining is easy due to the elasticity of the plastic when pressing the joining members, but after joining Since it is made of plastic, the pressure is rather weak, resulting in wobbling.

The object of the invention is to provide a new pipe connection method which eliminates the drawbacks of the prior art as detailed above.

According to this invention, the joining jig interposed between the square pipe and the pipe joint is made of triangular prism metal.

Convex and concave circumferential surfaces are alternately formed in the longitudinal direction on the outer circumferential surface of the insertion portion of the pipe joint and the inner wall surface of the joining jig. The joining jig is inserted only at two diagonal locations, and since the joining jig is connected at the head and can be slightly separated and moved, the pipe member can be easily rotated.

Furthermore, since the joining jig is made of metal, its convex portion and the convex portion of the pipe fitting insertion part strongly abut, and the joining jig is strongly pressed against the corner of the square pipe member, making the pipe member and the pipe joint solid. can be fixed to.

The present invention will be described in detail below based on examples shown in three drawings.

FIG. 1 is an exploded perspective view of a pipe joint and a joining jig showing an embodiment of the pipe connecting method according to the present invention. In this embodiment, the pipe joint 10 has a shape in which a plurality of cylindrical insertion portions 14 are integrally connected at the root portion 12, and the outer peripheral surface of the insertion portion 14 has uneven stripes 16, 17 extending in the longitudinal direction.
is formed. The joining jig 20 is made of metal and has a substantially triangular prism shape as a whole, and has uneven stripes 26 on its inner wall surface.
27 is formed, and a rectangular engagement portion 28 with play is formed on the head 21 thereof. In use, the engaging parts 28 of the heads 21 of two joining jigs 20 of the same shape are engaged with each other with some play, and the shape is such that it fits into the space on the diagonal line of the corner of the square pipe member. Link. The connected joining jig 20 inserts the insertion part 14 of the pipe joint from both sides so as to cover the insertion part 14. In actual use, the connected joining jig 20 is integrally attached in advance to the tip of the insertion portion 14 of the pipe joint by means of joining means such as screws 40.

FIG. 2 is a sectional view taken along line A-A' in FIG. Joining jig 2
The pipe fitting is inserted so that the convex inner circumferential surface 26 formed on the inner wall of the tube joint and the concave outer circumferential surface 17 formed on the outer circumferential surface of the pipe joint insertion portion are aligned with each other. At the same time, the concave inner circumferential surface 27 of the welding jig
This also means that the insertion portion convex outer circumferential surface 16 is aligned. The joining jig 20 is inserted up to the root portion 12 of the insertion portion of the pipe joint. In this aligned state, it is extremely easy to fit the joining jig and the pipe joint insertion portion.

In addition, in the aligned state, the joining jig and the pipe joint insertion portion are connected by screws 40 or the like, and the pipe joint is fitted into the square pipe member 30. In this case, it is extremely easy to fit the pipe joint into the square pipe member. That is, there is sufficient space between the inner wall 34 of the square pipe member and the outer wall 22 of the joining jig 20, and the corner 32 of the square pipe member and the corner 24 of the joining jig
Fit the joining jig and pipe joint into the hollow of the square pipe member. In addition, as shown by the broken line in FIG. 1, the square pipe member 30 is
It is inserted in a displaced state.

FIG. 3 is a perspective view showing a state in which the pipe joint insertion portion 14, the joining jig 20, and the square pipe member 30 are press-fitted in the pipe connection method according to the present invention.

FIG. 4 is a sectional view taken along line BB' in FIG. 3. In this embodiment, the square pipe member 30 is rotated by 45° to either the left or right from the fitted state shown in FIG. As a result, the insertion portion 14, the joining jig 20, and the square pipe member 30 are
The fitted and fixed state shown in FIGS. 3 and 4 is achieved.

When the square pipe member 30 is rotated 45 degrees to either the left or right, the joining jig 20 is pushed by the square pipe member inner wall 34,
Rotates 45 degrees with the square pipe. As a result, the convex inner circumferential surface 26 formed on the inner wall surface of the joining jig that was loosely fitted rotates against the convex outer circumferential surface 16 formed on the outer circumferential surface of the pipe joint insertion part, The convex inner circumferential surface 26 of the welding jig and the convex outer circumferential surface 16 of the pipe joint insertion portion firmly abut, pressing the welding jig 20 backward.

As a result, as shown in FIG. 4, the welding jig 20 is pushed outward by the difference in height between the convex circumferential surface and the concave circumferential surface.

The square pipe member inner wall 34 and the joining jig outer wall 22 are firmly abutted and fixed.

In this invention, since a metal joining jig is used, the strength is superior to that of conventional joining jigs, and the joining is strong.

Furthermore, since the joining jig can be joined only at two diagonal locations, the other corners that are not pressed become gaps or relief parts, compared to the conventional method of pressing at the four corners. Namely.

In the conventional method of pressing in four directions, the square shape of the square pipe member is not deformed, so there is no gap or escape. Therefore, if the joining member is made of metal, it will not actually rotate. According to this invention, the square pipe member is deformed into a diamond shape to some extent, so that it can be pressed more strongly than the conventional one.

Moreover, since it is made of metal, the pressing force is extremely strong and effective. Furthermore, since the joining jig has a form in which two members are engaged with each other, the two members are slightly separated and moved toward the outside during joining, so that the pressing force becomes stronger. Also.

Since the joining jig is of a type that connects two members of the same shape, there is also an economical advantage that one mold for the joining jig is sufficient. In addition, in Embodiment 11 and Example 9 shown in one drawing, the angles of the square pipe members in the assembled state are all 90-degree faces.

Of course, the method according to the present invention can also be applied to an assembled shelf that is rotated by 45 degrees.

Since the pipe connecting method according to the present invention has the configuration described in detail above, it utilizes the height difference between the convex circumferential surface and the concave circumferential surface formed on the outer circumferential surface of the insertion portion and the inner wall surface of the joining jig 20. By rotating the pipe member by 45° to either side, the joining jig 2o is pressed and fixed to the corner portion 15 of the pipe member, and as a result, the pipe member 30 and the pipe joint insertion portion 14 are connected to the joining jig 2o. It is firmly fitted through. For this reason, it has great practical advantages in that the connection between the pipe and the joint is reliable and strong, and the disconnection operation is extremely easy.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a pipe joint and a joining jig showing an embodiment of the pipe connecting method according to the present invention. FIG. 2 is a sectional view taken along the line AA' in FIG. 1. FIG. 3 is a perspective view showing a state in which the pipe joint insertion portion 14, the joining jig 2o, and the square pipe member 30 are press-fitted in the pipe connection method according to the present invention. FIG. 4 is a sectional view taken along line BB' in FIG. 3. 10: Pipe joint 12: Pipe joint raw root portion 14: Cylindrical insertion portion 16: Convex outer circumferential surface of the insertion portion 17: Concave outer circumferential surface of the insertion portion 20: Jointing jig 21: Jointing jig head 22: Jointing jig outer wall 24: Welding jig corner 26; Welding jig convex inner circumferential surface 27: Welding jig concave inner circumferential surface 28: Rectangular meshing portion 30: Square pipe member 32: Square pipe member corner 34; Square pipe member inner wall 40: Screw

Claims (1)

[Claims] In a pipe connection method in which square pipe members are joined by interposing a joining jig between a corner of the square pipe member and a cylindrical insertion portion of a pipe joint, the joining jig is a substantially triangular prism metal. The triangular prism is formed with an uneven inner wall surface, and the triangular prism is connected at the head so as to be able to move freely, and is fitted into two diagonal points of the corner of the square pipe member, while the outer peripheral surface of the pipe joint insertion part By forming it into an uneven shape and rotating the square vibe member. The convex outer peripheral surface formed on the pipe joint insertion part and the convex inner peripheral surface formed on the joining jig are brought into contact with each other, and the joining jig is pressed against the corner of the square pipe member to solidify the square vibe member. A pipe connection method that adheres to the joint.