JP3921640B2 - Double tube - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double tube, and more particularly, to a double tube with a simple assembly and a small number of parts in the manufacturing process.
[0002]
[Prior art]
Conventionally, hair dye tubes are usually sold as a set in which the first agent and the second agent are housed in separate tubes. The first agent is a basic oxidation dye, the main agent is housed in a sealed metal tube that does not allow gas and liquids to pass, and the second agent is hydrogen peroxide with the purpose of oxidative polymerization of the first agent dye. Is contained in a double tube in which a synthetic resin interior tube having a property of allowing gas to pass but not allowing liquid to pass is fitted inside a metal exterior tube. Such a double tube is used as a tube container for storing the hair dye as well as for storing an adhesive. A tube container as a container for storing adhesive is required to have light-shielding properties, barrier properties, etc., and in order to prevent direct contact between the adhesive and the metal tube, it is synthesized inside the metal outer tube. A double tube into which a resin interior tube is inserted is used.
[0003]
Such conventional double tubes include those shown in FIGS. In the figure, reference numeral 50 denotes an exterior tube made of a metal material such as aluminum and integrally formed with a mouth portion, a shoulder portion and a trunk portion. Inside the outer tube 50, an inner tube 51 made of a synthetic resin such as polyethylene and integrally formed with a mouth portion, a shoulder portion and a trunk portion is fitted. And as shown in FIG. 8, the front-end | tip front part 51a of the interior tube 51 is bend | folded outward so that the front-end | tip part 52 of the exterior tube 50 may be covered, and the inside plug body 53 is press-fit from the top. A cap 54 is screwed onto the inner plug 53. In this way, by covering the mouth tip 51a outwardly, it is possible to prevent the contents from adhering to the mouth 52 of the metal portion and corroding the mouth 52. Further, the insertion of the inner plug 53 also serves to prevent oxygen generated by the decomposition of hydrogen peroxide, which is the contents, from leaking from the mouth portion 52 to the outside. Conventionally, oxygen generated by the decomposition of hydrogen peroxide is intentionally released from the tube skirt 55 to the outside to prevent the double tube from being filled and pressurized with oxygen and bursting. It was.
[0004]
[Problems to be solved by the invention]
However, this invention has the following drawbacks.
(A) In the manufacturing process for assembling the outer tube 50 and the inner tube 51, the front end 51a of the inner tube 51 covers the front end of the mouth 52 of the outer tube 50, and the outer tube 50 is bent outward. It is necessary to perform an operation of fitting the plug body 53, which requires a labor.
(B) Oxygen generated by the decomposition of hydrogen peroxide over time cannot be released to the outside through the gap between the mouth portion 52 and the inner plug 53, and oxygen release may be insufficient. (C) When the mouth end 51a of the interior tube 51 is bent and locked to the outer periphery of the mouth portion 52, the inner plug body 53 must be fitted, so that the number of parts increases.
[0005]
The present invention has been made paying attention to such a conventional problem, and in the manufacturing process for assembling the outer tube and the inner tube, the assembling work is simple, and oxygen is used as the hair dye tube. An object of the present invention is to provide an inexpensive double tube which can be easily discharged out of a heavy tube and has a small number of parts as an adhesive tube.
[0006]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a double tube composed of a metal exterior tube and a synthetic resin interior tube provided in close contact with the interior of the exterior tube. The upper end of the tapered shoulder portion has a cut shape at the mouth, and the internal tube has a male thread formed at the mouth, and at the upper end of the shoulder or the lower end of the mouth male thread, The outer tube and the inner tube are formed so that an insertion portion for inserting and locking the upper end of the shoulder portion by an undercut method is formed, and the mouth screw portion of the inner tube is exposed upward from the shoulder portion of the outer tube. Is a double tube characterized by being assembled in close contact with each other. Further, in such a double tube, a cap having a female screw that is screwed with a male screw of the mouth portion is provided, and a tip end portion of the mouth portion of the interior tube is formed on the cap top surface or the cap top surface. You may contact | abut to a projection part.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described with reference to the drawings. 1 and 2 are drawings showing an embodiment of the double tube of the present invention , in which 1 is an exterior tube made of a metal such as aluminum, and the exterior tube 1 is at the upper end of the shoulder 1a. The mouth has a cut shape.
[0008]
On the other hand, the inner tube 2 is formed by integrally molding the body 2a, the shoulder 2b, and the mouth 2c by a method such as injection or blow molding using a synthetic resin such as polyethylene. A fitting portion 2d for fitting and locking the upper opening edge 1b of the outer tube 1 is formed at the upper end of the shoulder portion 2b or the lower end of the male screw portion of the mouth portion 2c. When the upper opening edge 1b of the outer tube 1 is securely fitted and locked to the fitting portion 2d, the outer tube 1 and the inner tube 2 are assembled in close contact. After the assembly, as shown in FIG. 1, the mouth portion 2 c of the inner tube 2 is exposed upward from the shoulder portion 1 a of the outer tube 1, and a cap 3 is attached to the male screw formed on the outer periphery of the exposed mouth portion 2 c. When the female screw is screwed, the mouth portion 2c of the internal tube 2 is closed. When the cap 3 is screwed, the tip of the mouth 2c comes into contact with the ring-shaped protrusion 3b of the cap top surface 3a.
[0009]
3 and 4 are views showing a double tube outside the scope of the present invention. The difference from the double tube of the present invention is that the upper opening edge 1b of the outer tube 1 in the double tube of the present invention is different. The upper portion 1c is formed above, and the male screw is formed on the outer periphery of the mouth portion 1c. The mouth portion 2c of the inner tube 2 is closed by exposing the mouth portion 2c of the inner tube 2 from the mouth portion 1c of the outer tube 1 and screwing the female screw of the cap 3 into this male screw. When the cap 3 is screwed, the tip of the mouth 2c comes into contact with the ring-shaped protrusion 3b of the cap top surface 3a. FIG. 5 is a view showing a double tube outside the scope of the present invention. The nozzle portion 4 is formed by integral molding above the interior tube 2, and the nozzle portion 4 extends upward from the mouth portion 1 c of the exterior tube 1. Exposed. Moreover, the tip of the nozzle part 4 is closed so that the sealing property can be maintained until it is used, and is appropriately cut and used at the time of use. Figure 6 is a view showing a range of the double tube of the present invention, the upper open end 1d is formed mouth of the armor tube 1 is extended to the upper, from the upper open end 1d, interior tube The tip of the second nozzle portion 4 is slightly exposed. Other configurations and methods of use are the same as those of the double tube of FIG.
[0010]
[Action]
The operation of the present invention having the above configuration will be described. In the double tube of the present invention in which a male screw is formed on the outer periphery of the mouth portion of the inner tube and the male screw and the female screw of the cap are screwed together, the upper opening edge of the outer tube is the upper end of the shoulder portion of the inner tube or The fitting portion formed at the lower end of the male screw portion of the mouth is securely fitted and locked by a so-called undercut method. And the exterior tube and the interior tube are being fixed reliably . In the double tube according to the present invention, since the mouth portion of the interior tube is exposed from the exterior tube, oxygen generated in the double tube is transmitted not only from the hem portion of the double tube but also from the mouth portion of the interior tube. to, that Do is possible to efficiently release it is possible to release to the outside.
[0011]
【The invention's effect】
As described above, according to the present invention, it is easy to assemble the outer tube and the inner tube in the manufacturing process, and it is possible to efficiently release oxygen to the outside from the mouth portion of the inner tube. . Furthermore, since it is not necessary to fit the inner plug to the mouth, the parts constituting the double tube can be reduced, and an inexpensive double tube can be provided.
[Brief description of the drawings]
Figure 1 is a front sectional view showing a double tube according to the present invention.
Figure 2 is an exploded sectional view showing the components constituting the double tube according to the present invention.
Figure 3 is a front sectional view showing a double tube according to the outside of the invention.
Figure 4 is an exploded sectional view showing the components constituting the double tube according to the outside of the invention.
Figure 5 is a front sectional view showing a double tube according to the outside of the invention.
Figure 6 is a front sectional view showing a double tube according to the outside of the invention.
FIG. 7 is a front sectional view of a conventional double tube.
FIG. 8 is an exploded cross-sectional view showing components constituting a conventional double tube.

Claims (2)

In a double tube composed of a metal outer tube and a synthetic resin inner tube provided in close contact with the inner side of the outer tube,
The outer tube has a shape in which the mouth is cut at the upper end of the tapered shoulder,
The internal tube has a male thread formed in the mouth portion, and a fitting portion that fits and locks the shoulder tube upper end by an undercut method is formed on the shoulder upper end or the mouth male screw lower end. And
A double tube in which the exterior tube and the interior tube are assembled in close contact so that the mouth thread portion of the interior tube is exposed upward from the shoulder of the exterior tube. A cap having a female screw threadably engaged with the male screw of the mouth;
The double tube according to claim 1 , wherein a tip end portion of the mouth portion of the interior tube abuts against a cap top surface or a ring-shaped protrusion formed on the cap top surface .

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