JPS6020817Y2 - Hollow member joint structure - Google Patents

Description

[Detailed description of the invention] This invention relates to a hollow member joining structure for joining the end face of a hollow member such as a pipe to a flat member such as an angle, and particularly aims to provide a joining structure that can be easily installed. It is.

For example, fences or window protection rails are often constructed by attaching hollow members such as pipes to a U-shaped angle in the form of a ladder.

Conventionally, methods such as welding or screwing have been used to attach the end of the hollow member to the U-shaped angle.

Welding requires skill, and the heat during welding damages the paint or surface treatment film, so finishing is required after assembly.

Therefore, work efficiency is poor.

Furthermore, in the case of fixing with screws, tapping is required on the inner wall of the hollow member, which is also inefficient.

For this reason, it is known to utilize hollow rivets to connect a hollow member to a flat member.

Hollow rivets are generally attached to plates 1 and 2 as shown in Figure 1.
It is used to tighten the

3 in the figure is a hollow rivet.

The hollow rivet 3 has a flange-shaped head 4, a hollow shaft 5,
The core member 6 is inserted into the through hole of the hollow shaft 5.

The core material 6 has a flange 7 on the tip side of the hollow shaft 5, and by applying a pulling force to the core material 6, the outer circumference of the hollow shaft 5 is expanded, and the plates 1 and 2 are applied by the expanded portion 8 and the head 4. Used to tighten.

FIG. 2 shows a conventional structure in which the end of a hollow member is connected to a flat member using such a hollow rivet.

In the figure, numeral 9 indicates a flat member such as a U-shaped angle.

Reference numeral 10 designates a hollow member coupled to the plane portion of this plane member 9.

This example shows the case of a cylindrical planar member.

Holes 11 are formed in the flat part of the flat member 9 at intervals at which the flat member 10 is to be attached.

The hollow rivet 3 is inserted through this hole 11, and the hollow shaft 5 of the rivet 3 is inserted into the hollow part of the hollow member 10.

In this state, a pulling force is applied to the core material 6 inserted into the rivet 3.

Due to this pulling force, the core material 6 expands the outer diameter of the hollow shaft 5 of the rivet 3 by the collar 7 to form an expanded portion 8.

The outer periphery of the enlarged portion 8 formed on the hollow shaft 5 fits into the inner wall of the hollow member 10, and the hollow member 10 is connected to the U-shaped angle 9.

The relationship between the inner diameter D1 of the hollow member 10 and the outer diameter D2 of the hollow shaft 5 of the hollow rivet 3 before deformation is such that if the difference D1-D2 is too large, a large force will be applied to the outer periphery of the enlarged portion 8 against the inner wall of the hollow member 10. It is not possible to mate them with each other.

According to experiments, the outer diameter D2 of the hollow shaft 5 of the rivet 3 is D2=
In the case of 4 mm, Dl-D2=0.1 to 1. O(rfFM
), preferably about 0.8rIrln, was confirmed to be appropriate.

In this experiment, an aluminum pipe was used as the hollow member 10, and in this case, the wall thickness of the pipe was 1.2r.
It required more than IrIn.

That is, if the wall thickness of the hollow member 10 is small, the hollow member 10 may also be deformed or even damaged due to the expansion of the rivet 3.

The purpose of this invention is to provide a hollow member joining structure that uses hollow rivets and allows even relatively thin hollow members to be joined to flat members without being deformed or damaged.

As shown in FIGS. 3 and 4, for example, a plurality of protrusions 12 or a core portion 13 having a C-shaped cross section are formed integrally with a hollow member 10 by, for example, extruded material, and the plurality of protrusions are The collar 7 side of the hollow rivet 3 is engaged with the strip 12 or the core 13.

As described above, in this invention, since the hollow rivet 3 is engaged with the protrusion 12 or the core portion 13, the wall thickness of the hollow member 10 itself can be made thinner than 1.2 mm.

Further, the hollow member 10 need not be cylindrical, but may be a rectangular hollow member as shown in FIG. 5.

In that case, a circular hollow part 14 is formed in a part of the square cross section, and although not shown in the figure, the protrusion or core part is integrally formed in this circular hollow part 14, and the protrusion or core part is formed integrally with the circular hollow part 14. All you have to do is engage the hollow rivet.

As described above, if the hollow member 10 is caulked to the flat member 9 by utilizing the expansion deformation of the hollow rivet 3, there is no need to perform any processing on the hollow member 10, and the pulling force of the core material 6 is reduced. Assembly is easy because it is done with a special tool, and since it is not heated unlike welding, the paint or surface treatment film on parts 9 and 10 will not be damaged, and finishing processing will not be required after assembly. There is no
Therefore, the assembly work is efficient and can be assembled in a short time.

In this invention, a protrusion or core is integrally formed within the hollow part of the hollow member, and a hollow rivet is engaged with this protrusion or core, so it has many advantages over the above-mentioned joint structure using hollow rivets. Even when the hollow member has a small wall thickness, the hollow member can be firmly connected without being deformed or damaged while being held.

[Brief explanation of the drawing]

Fig. 1 is a sectional view for explaining the hollow rivet used in this invention, Fig. 2 is a sectional view showing an example of a conventional hollow member joining structure using hollow rivets, and Figs. 3 to 5 are sectional views for explaining the invention. FIG. 3: Hollow rivet, 4: Head of hollow rivet, 5: Hollow shaft, 6: Core material, 7: Tsuba, 8: Ampulla, 9: Planar member, 1
0: hollow member, 11: hole.

Claims (1)

[Scope of utility model registration request] A hole formed in a planar member, a hollow shaft of a hollow rivet protruding from one surface of the planar member through the hole, and a flange on the protruding end side of the hollow shaft, and a through hole of the hollow rivet is passed through the planar member. A core material led out to the other surface side and a plurality of protrusions substantially parallel to the hollow shaft or a core portion having a substantially C-shaped cross section perpendicular to the hollow shaft are integrally formed in the hollow portion, The rim side of the rivet is inserted into the hollow part and engaged with the plurality of protrusions or the core part, and the outer diameter of the hollow rivet is expanded and deformed by applying a pulling force to the core material. A hollow member joining structure in which the hollow member is supported by the planar member by expansion deformation thereof.