JPH0723823A - Node structure of pipe material - Google Patents

Abstract

PURPOSE:To provide the connecting structure for surely connecting pipe materials and a base body for coupling the plural pipe materials. CONSTITUTION:This connecting structure has the base body 20 having plural shaft-like couplers 22 extending in a radial direction and the pipe materials 11 to be fitted to the outside surfaces of the couplers extending from the base body 20. The relation between the couplers and the pipe materials 11 is so set that deformation resistance increases with an increase in the displacement of press-fitting surfaces at the time of press fitting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knot structure having a base body for connecting the ends of several pipe materials to each other to make various pipe structures such as bookcases, tables, clothes hangers and the like. In particular, the present invention relates to a connecting structure between the base and the pipe.

[0002]

2. Description of the Related Art Conventionally, a knot structure including a plurality of pipes for the above-described bookcases and display shelves and a base for connecting them is known. That is, at least three left and right and up-and-down through-holes that pass through the ball center and are orthogonal to each other are provided in a base sphere made of synthetic resin, and a pipe having an outer diameter slightly larger than the inner diameter is strongly formed in the through-hole. There is a commercially available product that is pushed in and prevented from coming off due to the friction.

[0003]

However, in the conventional one, the holes and the pipe provided in the synthetic resin base body, which is the base body, are simply press-fitted to assemble the base body and the pipe. Since either of them causes plastic deformation, the bond tends to be weak, the rigidity of the assembled structure is low, and the structure tends to be sluggish. Further, in order to increase the rigidity, it is necessary to set a large press-fitting allowance between the through hole provided in the base and the pipe material, but the accuracy of the hole provided in the base is higher than the outer diameter of the pipe material. It was causing quality problems. That is, when the base is molded as a synthetic resin, it is not easy to obtain the accuracy of the hole for inserting the pipe material. On the other hand, the pipe material is mass-produced and manufactured with high accuracy. Is not useful. The present invention eliminates such a problem, easy assembling work,
Moreover, it is intended to obtain a knot structure having high rigidity after assembly.

[0004]

SUMMARY OF THE INVENTION The present invention, which has been made to achieve the above object, comprises a base having a plurality of axial joints extending in the radial direction, and press-fitting to the outer surface of the joint extending from the base. It is characterized in that the pipe material to be fitted together is provided, and the relation between the joint and the pipe material is set so that the deformation resistance in each cross section increases as the press-fitting progresses.

[0005]

When the pipe material is fitted to the outer surface of the shaft-shaped joint, the two cannot be easily pulled out due to friction, and the knot structure is completed. When fitting, since the deformation resistance in each cross section increases as the displacement increases from the beginning of fitting, the fitting operation at the beginning of press fitting is easy, and the work of fitting them together becomes easy. Further, when the operation for increasing the displacement is advanced, even if the insertion resistance is increased, it is possible to perform the operation without prying, because a part of the insertion resistance is already fitted. Further, when the press-fitting progresses, plastic deformation occurs in the vicinity of the end of the pipe material in the direction of increasing the diameter, but as the press-fitting progresses, the deformation resistance of the joint forming the base increases, so that the fitting of the pipe material A strong friction force is retained for the entire combined portion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In FIG. 1, reference numeral 10 denotes a futon dryer utilizing a knot structure according to the present invention, in which a plurality of pipe members 11 are connected to each other by a base body 20 at both ends, and thus, 12 long and short pipe members 11 are provided. A pipe structure is formed by a nodal structure formed by connecting eight bases 20 together. 12 is a futon that is hung on the futon dryer 10. In the futon dryer 10, the pipe material 11 is generally a straight pipe without taper such as a metal pipe such as a steel pipe or a stainless pipe coated with anticorrosion, or a synthetic resin pipe.

FIG. 2 and FIG. 3 show the main body 20, which is the main part, taken out. That is, the base body 20 is made of a synthetic resin molded product, and has a substantially spherical main portion 21 and a shaft-shaped joint 22 extending in the vertical or horizontal direction and in the radial direction from the main portion 21. A mode of the bond 22 is shown in FIG. That is, FIGS. 2B and 2C are provided with two or three joints 22 extending in a two-dimensional direction of the X-axis direction x and the Y-axis direction y or the X-axis direction x and the Z-axis direction z. In addition to the ones extending in the X-axis direction x and the Y-axis direction y, FIGS. 3B and 3C respectively extend in the Z-axis direction z.
A book or four bonds 22 are provided. Thus, the pipe structure described above is constructed by fitting and joining the ends of the pipe material 11 to the outer peripheral surface of the joint 22 of the base body 20. In this embodiment, the pipe material 11 is a so-called straight pipe that does not have a tapered portion in the inner and outer diameters, but the joint 22 is not a simple round bar, but has various changed shapes and hardnesses. Has been given.

Next, in the present invention, as the press-fitting progresses in the joint 22 in relation to the pipe material 11,
That is, the deformation resistance is set to increase as the displacement of the press-fitting surface increases. Of course, in the past, if a pipe material was press-fitted into a shaft made of hard rubber, for example, the displacement would increase and the press-fitting resistance would accumulate, resulting in the need for a large amount of pressure, but this does not mean that. In this invention, it means that the deformation resistance itself in each cross section increases.

That is, as shown in FIGS. 2 and 4, the joint 22 is formed with an axial groove 23 whose depth and width decrease from the free end toward the base end. .
Therefore, the deformation resistance is small in the vicinity of the end of the joint 22, and when the pipe member 11 is fitted thereto, the joint 22 can be easily deformed at the beginning. Even if the inner diameter near the opening of the pipe material 11 tends to expand due to plastic deformation as the press-fitting progresses, the coupling due to the press-fitting is not weakened thereby, and the effective frictional force is exerted over the entire length of the press-fitted portion. Is obtained. Further, in addition to simply changing the depth and width of the groove 23 in the axial direction, as shown in FIGS. 3 and 5, the vicinity of the end of the pipe material 11 is pressed from the outside to swell to the inner surface,
A spherical projection 24 is provided on the inner surface, and the spherical projection 24 is engaged with the groove 23. As a result, it is possible to further increase the frictional resistance in each cross section as the press-fitting progresses.

This idea is not limited to the case where the pipe material 11 and the joint 22 are press-fitted in the axial direction. That is, FIG.
Then, it is also used when the press-fitted pipe material 11 is rotated in the circumferential direction to ensure the connection. This is a bond 2
2 is provided with not only the groove 23 in the axial direction but also the groove 25 in the circumferential direction. On the other hand, when the spherical projection 24 provided on the pipe material 11 passes through the axial groove 23 and the circumferential groove 25, the frictional resistance in each cross section is successively increased as the spherical projection 24 advances.

As described above, the joint structure according to the present invention can be used not only for the clothes-dryer 10 but also for the legs of the indoor table 15 as shown in FIG. 7, and as shown in FIG. It can also be used as an indoor shelf 16 for forming a TV, a figurine, or a pot of an ornamental plant by forming it in multiple stages. Further, as shown in FIG. 9, it can also be used as a large two-stage hanger 17 on which a large number of clothes can be placed. In addition, in this example, the lowermost substrate 20
The caster wheels 18 are attached to the.

In the present invention, the pipe material 11 is
The pipe is not necessarily limited to a hollow pipe, and at least the joint 22
It will be apparent from the above description that the member has a hole fitted to the outer periphery of the.

[0013]

As described above, according to the present invention, since the shaft-like joint 22 is projected from the base and the pipe material 11 is fitted and connected to the outer periphery of the joint 22, the pipe having a relatively good dimensional accuracy is generally provided. Material 11 and joint 2 that is made into a shaft shape to facilitate precision
Since 2 is connected, the press-fitting accuracy is good and high rigidity can be obtained at the joint. Further, since the relationship between the joint 22 and the pipe material 11 is set so that the deformation resistance of each cross section increases as the press-fitting progresses, even if plastic deformation occurs in the pipe member during the press-fitting, the tightening force There is little decrease, and there is an effect that high rigidity can be obtained at the joint.

[Brief description of drawings]

FIG. 1 is an external view showing a futon dryer according to an embodiment of the present invention.

FIG. 2 is an external view showing a main part thereof taken out.

FIG. 3 is a sectional view taken along the line III-III.

FIG. 4 is an external view corresponding to FIG. 2 showing another embodiment.

FIG. 5 is an external view of a main part showing its assembled state.

FIG. 6 is a view showing a plurality of usage examples of a base body 20 which is an essential part.
It is a considerable external view.

FIG. 7 is an external view showing another embodiment of the present invention.

FIG. 8 is an external view corresponding to FIG. 7 showing another embodiment.

9 is an external view equivalent to FIG. 7 showing another embodiment.

[Explanation of symbols]

 11 Pipe Material 20 Base 21 Main Part 22 Axial Coupling 23 Axial Groove 25 Circumferential Groove

Claims (5)

[Claims] 1. A base member having a plurality of axial joints extending in the radial direction, and a pipe member press-fitted onto the outer surface of the joint member extending from the base member, and the joint member and the pipe member. The knot structure of the pipe material is set so that the deformation resistance in each cross section increases as the press-fitting progresses. 2. The knot structure of pipe material according to claim 1, wherein the retaining means is an engagement means that is engageable and disengageable formed between the joint and the pipe material. 3. The knot structure of pipe material according to claim 1, wherein the retaining means is a friction resistance means in which the insertion resistance is sequentially increased from the free end to the proximal end of the shape of the joint. 4. The knot structure of pipe material according to claim 1, wherein at least one base body has a plurality of joints extending in a two-dimensional direction of an X-axis direction and a Y-axis direction. 5. The knot structure of pipe material according to claim 1, wherein at least one base body is provided with a plurality of joints extending in three-dimensional directions of an X-axis direction, a Y-axis direction, and a Z-axis direction.