JPH04224025A - Nodulated tube, nodulated clad tube and manufacturing device therefor - Google Patents

Abstract

PURPOSE:To manufacture a nodulated tube excellent in strength and decorativeness by providing a grooved line part on the inner peripheral part of an outer die and a projecting line part on the outer peripheral part of an inner die and forming the projecting line part so that it can bulge into the grooved line part. CONSTITUTION:A manufacturing device for a nodulated tube is composed of the outer die 1 and the inner die 2. When the grooved line part 4 and the projecting line part 5 having a pressing function each are provided on the inner peripheral part of the outer die 1 and on the outer peripheral part of the inner die 2, respectively and the projecting line part 5 is formed so that it can bulge into the grooved line part 4, the nodulated tube can be manufactured easily. Further, when the grooved line part 4 can bulge to the outside of the projecting line part 5, the same effect as mentioned before can be obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to knotted tubes and knotted composite tubes used as supports for street lamps, indoor lighting equipment, fences, etc., and an apparatus for manufacturing the same.

0002

BACKGROUND OF THE INVENTION In general, metal pipes and synthetic resin pipes are used for various purposes because they are light and have high strength, but it is sometimes very convenient to have knots on the surface. For example, when used as scaffolding materials, when the scaffolding materials are connected together using clamps, the knots act as a non-slip feature, allowing the scaffolding materials to be firmly connected without slipping.

[0003] In addition, the joints serve as reinforcing ribs to increase the strength, and they also have a decorative effect, and can be used as supports for street lamps, indoor lighting equipment, or fences.

[0004] The present invention provides a knotted pipe and a knotted composite pipe that can be used for various purposes, and a knotted pipe and knotted composite pipe manufacturing apparatus that can easily produce these knotted pipes and knotted composite pipes. The purpose is to provide the following.

[0005]

[Means for Solving the Problems] In order to solve the above-mentioned problems, a knotted pipe manufacturing apparatus according to the present invention is composed of an outer mold and an inner mold, and has an inner peripheral part of the outer mold and an outer peripheral part of the inner mold. and a grooved portion and a protruding portion that both have a pressing function, and one of the protruding portion of the inner mold and the grooved portion of the outer mold is formed so as to be able to bulge toward the other side. It is.

Further, the knotted composite pipe according to the present invention is obtained by covering the outer periphery of a reinforcing pipe with a decorative pipe, and integrally press-molding a plurality of knots on the reinforcing pipe and the decorative pipe. Alternatively, a plurality of nodes may be press-molded onto a decorative tube, and the decorative tube may be attached to the outer periphery of the reinforcing tube. Furthermore, a decorative tube may be simply formed with a plurality of nodes.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments. FIG. 1 shows an embodiment of a knotted composite pipe manufacturing apparatus according to the invention as set forth in claim 1. In the figure, number 1 is the outer mold, 2 is the inner mold, number 3 is the hydraulic source,
The symbol A indicates a pipe material such as a metal pipe such as a steel pipe or an aluminum pipe, or a synthetic resin pipe.

The outer mold 1 is formed into a circular ring shape from metal, hard synthetic resin, or hard rubber, and a groove 4 having a U-shaped cross section or a U-shaped cross section is formed on the inner circumference of the outer mold 1. It is formed continuously in the circumferential direction.

The inner mold 2 is made of hard rubber and has a flat cylindrical shape that is one size smaller than the inner diameter of the outer mold 1.
It is hollow so that pressurized oil can be forced into it.

[0010] On the outer periphery of the inner mold 2, a convex strip 5 having a rectangular or semicircular cross section is formed continuously in the circumferential direction in correspondence with the groove strip 4. The groove portion 4 and the protruding portion 5 are pressed together by the protruding portion 5 expanding into the groove portion 4 when pressurized oil is press-fitted into the hollow portion 6 of the inner mold 2. It has a function.

Note that the protruding strips 5 of the inner mold 2 may be formed integrally with the inner mold 2, but they may also be formed by a simple method such as wrapping a wire such as a ring or reinforcing bar around the outer periphery of a steel pipe. good.

Further, presser plates 7 made of highly rigid metal plates are attached to the left and right side portions of the inner mold 2 to prevent these portions from expanding due to hydraulic pressure. In addition, the convex portion 5
A flexible cylindrical body 8 made of soft rubber or the like is filled inside to a constant thickness.

In such a configuration, in order to manufacture a knotted tube, an outer mold 1 is installed on the outside of the tube material A, and an inner mold 2 is installed on the inside of the tube material A so as to overlap with the outer mold 1. continue,
Pressure oil is injected into the hollow part 6 of the inner mold 2 from the hydraulic source 3, and the inner mold 2
The protrusions 5 are bulged into the grooves 4, and the side walls of the tube A are pressed by the grooves 4 and the protrusions 5.

[0014] Such press working is performed on the tube material A or the outer mold 1.
And by shifting the inner mold 2 at regular intervals in the longitudinal direction of the tube material A, a knotted tube can be manufactured.

Note that the groove portion 4 and the protruding portion 5 may be formed double or triple, or the inner surface of the groove portion 4 and the protruding portion 5 may be formed double or triple.
By forming various patterns on the surface of the material, knots with novel shapes can be press-molded.

FIG. 3 shows an embodiment of a knotted tube manufacturing apparatus according to the invention as set forth in claim 2. In the figure,
In the figure, number 1 is an outer mold, 11 is a reinforcing tube, and symbol A is a tube material such as an aluminum tube or a synthetic resin tube.

The outer mold 1 is formed into a circular ring shape from hard rubber, and the inner periphery thereof has a U-shaped cross section or a U-shaped cross section.
A groove portion 4 having a letter-shaped cross section is formed continuously in the circumferential direction. Further, it is formed hollow so that pressure oil can be press-fitted from the hydraulic power source 3.

The inner mold 2 is made of metal or hard rubber and is formed into a flat cylindrical shape that is one size smaller than the inner diameter of the outer mold 1. Further, on the outer periphery of the inner mold 2, a convex strip 5 having a rectangular or semicircular cross section is formed continuously in the circumferential direction in correspondence with the groove strip 4. When pressurized oil is pressurized into the hollow part 6 of the outer mold 2, the groove part 4 and the protruding part 5 bulge out to the outside of the protruding part 5, and together they have a pressing function. .

Further, inside the outer mold 1, a flexible cylindrical body 8 made of soft rubber or the like is formed to have a constant thickness. In addition, in the embodiment shown in FIGS. 1 and 3, the outer mold 1 and the inner mold 2 are formed long as shown in FIGS. 2 and 4, and a plurality of grooves 4 and protrusions 5 are formed. For example, multiple knots can be formed at the same time in one press process.

FIG. 5 shows an embodiment of a knotted composite pipe according to the invention as set forth in claim 3 or 4, and the knotted composite pipe 9 is formed on the outer periphery of a decorative pipe 10 made of a steel pipe or the like. A decorative pipe 10 made of an aluminum pipe or a stainless steel pipe is attached to the pipe, and a plurality of joints are integrally press-formed on the side walls of the reinforcing pipe 11 and the decorative pipe 10 using the knotted pipe manufacturing apparatus. It is formed.

Alternatively, a plurality of nodes may be press-formed on the decorative tube 10 using the above-mentioned apparatus, and the decorative tube 10 may be attached to the reinforcing tube 1.
It can also be formed by being attached to the outer periphery of 1.

Furthermore, a plurality of nodes are press-formed on the decorative tube 10 using the above-mentioned apparatus, and the decorative tube 10 is attached to the reinforcing tube 11.
It can also be used as is without being coated.

FIGS. 6 to 8 show fences and streetlights manufactured using the knotted composite tube 9 having a bamboo design formed by the above-mentioned apparatus.

[0024]

[Effects of the Invention] Since the present invention has the above configuration, it has the following effects. (2) According to the apparatus for manufacturing a knotted composite pipe according to the present invention, a knotted pipe with extremely high strength and decorativeness can be easily manufactured.

[0025] Also, since the knotted composite tube according to the present invention has a reinforcing tube inserted into the knotted tube, it has extremely high strength despite its small diameter.

[0026] If the structure is such that the joints are integrally press-molded on the reinforcing pipe and the decorative pipe, the reinforcing pipe and the decorative pipe can be integrated at the same time as forming the joints.

[0027]Furthermore, by forming knots on the decorative pipe and attaching the decorative pipe to the outer periphery of the reinforcing pipe, the knots only need to be formed on the decorative pipe, so the knots can be easily removed even with a small hydraulic pressure. can be formed.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a knotted tube manufacturing apparatus.

FIG. 2 is a sectional view showing a knotted tube manufacturing apparatus.

FIG. 3 is a sectional view showing a knotted tube manufacturing apparatus.

FIG. 4 is a sectional view showing a knotted tube manufacturing apparatus.

FIG. 5 is a partial perspective view of a knotted composite tube.

FIG. 6 is a front view of the fence.

FIG. 7 is a front view of a streetlight.

FIG. 8 is a front view of a streetlight.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1...Outer mold, 2...Inner mold, 3...Hydraulic pressure source, 4...Groove section, 5...Protruding section, 6...Hollow section, 7...Pressure plate, 8...Flexible cylindrical body, 9
... Knotted composite pipe, 10... Decorative pipe, 11... Reinforcement pipe.

Claims (5)

[Claims] Claim 1: Consisting of an outer mold and an inner mold, the inner peripheral part of the outer mold and the outer peripheral part of the inner mold are provided with grooves and protrusions that jointly have a pressing function, and the inner mold 1. An apparatus for producing a knotted pipe, characterized in that a protruding strip is formed in a grooved section of an outer mold so as to be able to bulge out. Claim 2: Consisting of an outer mold and an inner mold, the inner periphery of the outer mold and the outer periphery of the inner mold are provided with grooves and protrusions that jointly have a pressing function, and 1. An apparatus for manufacturing a knotted tube, characterized in that a grooved portion is formed so as to be able to bulge out to the outside of a protruding portion of an inner mold. 3. A composite pipe with knots, characterized in that a decorative pipe is attached to the outer periphery of a reinforcing pipe, and a plurality of knots are integrally press-molded on the reinforcing pipe and the decorative pipe. [Claim 4] Press-molding a plurality of nodes on a decorative pipe,
A knotted composite pipe characterized in that the decorative pipe is attached to the outer periphery of a reinforcing pipe. 5. A knotted pipe characterized in that it is formed by press-molding a plurality of knots on a decorative pipe.