JPH09221158A - Connection structure of hollow member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To seal an opening and prevent it from slacking, by providing a screw connection part screwing mutual hollow members and also an air-tight part at a position separated from both ends of the screw connection part in the axial direction, in a connection structure of an axial cylinder like a liquid- applying tool, writing materials, etc., and a hollow member like a front opening material. SOLUTION: One screw groove is cut at the outer peripheral face of the connection part 6 of a hollow member A and the other screw groove is cut at the inner peripheral face of a hollow member B. These members A, B are connected at the common screw s1 to form a writing tool. An airtight part 2 is formed at a position separated in the axial direction from both ends of the screws 1. That is, the constituting element 2a of the airtight part of the hollow member A is provided with protrusions at the position separated from both ends of the screw part 1 in the axial direction and the other constituting element 2b of the airtight part of the hollow member B is provided at the flat and smooth inner peripheral face connected to both ends of the screw part 1. Both constituting elements 2a, 2b are closely attached to each other to seal the opening 7 of the hollow member B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrel and a front end which are used in the fields of liquid applicators, writing instruments, makeup brushes, containers and the like.
The present invention relates to an improvement in a connecting structure between hollow members such as a barrel and a tail plug, a container and a front opening, and a container and a tail plug.

[0002]

2. Description of the Related Art As a general structure for connecting hollow members to each other in the above-mentioned field, there are threaded connections by screwing parts, concave and convex fitting between concave and convex parts, concave and convex fitting and bonding, etc. Are known. Among these, in the screw connection structure, when the hollow member is made of a synthetic resin material, the screw portion loosens due to aging, and the connection structure by concave-convex fitting and adhesion is an adhesive that can be used depending on the material of the hollow member. Is limited, and strict adhesive selection is required, and adhesion tests must be performed. Further, in the connection structure using the concave and convex portions and the concave and convex fitting, the concave and convex fitting is easily loosened due to the material of the hollow member, and it is difficult to seal the opening with the concave and convex fitting. A connection structure according to Japanese Utility Model Laid-Open No. 3-40964 is known as an example of a structure for connecting hollow members to each other by concavo-convex fitting.
In addition to the problem that the concavo-convex fitting is likely to loosen, particularly in the case of this conventional technique, the press-fitting portion of the front opening and the inner surface of the opening portion of the shaft cylinder must be in a close contact state, so that dimensional accuracy is required. In addition, the dimensional management is troublesome, and if the dimensions are slightly incorrect, the assembly may be difficult to assemble and the defective products may occur frequently after the assembly.

The present invention has been made in view of such circumstances of the prior art, and by cleverly combining well-known hollow member connection structures, the sealing of the opening and the prevention of loosening can be achieved all at once. An object of the present invention is to propose an improved hollow member connection structure.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is such that one outer peripheral surface of one hollow member and the other inner peripheral surface of the other hollow member are screwed together. A means for constructing a threaded portion is provided and an airtight portion is provided at a portion axially separated from both ends of the threaded portion. In the case of such technical means, it is possible to utilize an annular ridge, an annular groove, a smooth peripheral surface, etc. as the airtight portion constituent element.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Claims 1 to 4 will be described with reference to FIGS. The illustrated example is a hollow member that constitutes a writing instrument.

One of the hollow members A in all claims represents the case of the front end to which the writing part 3 is attached, and the other hollow member B represents the case of the barrel in which the ink 4 is filled. The threaded portion 1 common to the one hollow member A and the other hollow member B in all claims is a connecting pipe extending to one end of the one hollow member A opposite to the writing part mounting portion 5. One spiral groove is formed on the outer peripheral surface of the portion 6, and the other hollow member B is formed.
The other spiral groove is engraved on the inner peripheral surface of the other end, and both spiral grooves are screwed together.

A concrete example of the airtight portion 2 of claim 1 is shown in FIG.
The airtight portion constituent element 2a of one hollow member A and the airtight portion constituent element 2 of the other hollow member B will be described.
The airtight portion 2 is formed with b. The airtight portion constituent element 2a of one hollow member A is a proper number (the illustrated example is one) on the outer peripheral surface of the connecting pipe portion 6 at a portion axially separated from both the start end and the end end of the screwing portion 1. However, it may be two or three). The airtight portion constituent element 2b of the other hollow member B is formed by forming the inner peripheral surface continuing from the both ends of the screwing portion 1 at the start end and the end thereof into a smooth peripheral surface. The airtight portion 2 is configured by bringing the airtight portion constituent element 2a of the one hollow member A into close contact with the airtight portion constituent element 2b of the other hollow member B to seal the opening 7 of the other hollow member B. Therefore, since the airtight component 2a is axially separated from both ends of the screwed portion 1, the airtight component 2a is provided at a position axially separated from both ends of the screwed portion 1.

The airtight portion 2 of claim 2 will be described with reference to FIG. 2. A part of the airtight portion constituent element 2a (annular ridge) protruding from only one hollow member A in claim 1 has the same configuration. A part of the airtight portion constituent element 2b (smooth peripheral surface), which is configured as the element 2b on the entire circumference of the other hollow member B, and conversely, is configured only on the other hollow member B, is the same constituent element 2b.
The hollow member A on one side is configured as a.
Is different from the concrete example. That is, in FIG.
The airtight portion constituent elements 2a and 2b which are apart from the lower part in the axial direction are configured in the opposite manner to the first example. In this airtight portion 2, the airtight portion constituent element 2a is the same as the constituent element 2b.
And the opening 7 of the other hollow member B is sealed. Therefore, the second aspect of the present invention relates to the second aspect of the first aspect.
It corresponds to the embodiment.

The airtight portion 2 of claim 3 will be described with reference to FIG. 3. With respect to the configuration common to claims 1 and 2, the same reference numerals are used in the drawings to omit duplicate description, and different configurations will be described. To do. Specific configurations of the airtight portion constituent elements 2a and 2b, which are apart from the screwing portion 1 in the axial direction below, will be described with reference to FIG.

Where the airtight portion constituent element 2a of one hollow member A consists of an annular ridge projecting over the entire outer peripheral surface of the connecting pipe portion 6, and also over the entire inner peripheral surface of the other hollow member B, An airtight portion constituent element 2b composed of an annular protrusion that is locked and closely attached to the airtight portion constituent element 2a is configured. The site where the airtight component 2b is disposed is a part that is displaced upward (illustrated) or downward (not shown) in the figure from the same component 2a, and is a part that can be locked and adhered to the airtight component 2a. To do. In a specific example of claim 3, one of the airtight portions 2 (upper airtight portion 2 in FIG. 3) has the same structure as that of claim 1, and the other (lower airtight portion 2 in FIG. 3) is claimed. The third embodiment of the present invention corresponds to the third embodiment because it is different from that of the first embodiment.

Two embodiments of claim 4 are shown in FIG.
Although described in (b), the configuration common to claims 1, 2, and 3 (the airtight portion 2 above the screwing portion 1 in FIGS. 4A and 4B) is common to FIG. The different configurations will be described by entering the reference numerals, omitting the duplicate description.

In the first embodiment, the airtight portion constituent element 2 separated from the screwing portion 1 in the lower axial direction in FIG.
The specific configuration of a and the same constituent element 2b will be described. The airtight portion constituent element 2a of one hollow member A is an annular ridge projectingly provided on the entire outer peripheral surface of the connecting pipe portion 6, while the airtight portion constituent element 2b of the other hollow member B is arranged on the entire inner surface circumference. The airtight portion constituting element 2b is an annular groove provided as a recess.
The airtight portion constituent element 2a is engaged with and closely adheres to the opening portion 7 of the other hollow member B to seal. The arrangement part of the airtight part constituent element 2b formed in the hollow member B is a part facing the same constituent element 2a, and is the same constituent element 2a.
The entire height or a part of the top of the above is engaged and can be in close contact.

In the second embodiment, the airtight component 2 separated from the screwing portion 1 in the axial direction downward in FIG. 4B.
4a is the same as that of the first embodiment shown in FIGS. 1, 2, and 3 and FIG.
The component 2a and the component 2b shown in (b) will be described.

The airtight portion constituent element 2a of the hollow member A, which is one of the hollow members A, is an annular ridge projecting over the entire outer peripheral surface of the connecting pipe portion 6, as compared with the first embodiment shown in FIG. 4 (a). Is the same. However, the airtight portion constituent element 2b of the other hollow member B is an annular recess formed between a plurality of (two in the illustrated example) annular protrusions parallel to the axial direction on the entire inner peripheral surface. This is a groove, and this airtight part constituent element 2b
The airtight portion constituent element 2a is engaged with and closely adheres to the opening portion 7 of the other hollow member B to seal. The arrangement site of the airtight portion constituent element 2b formed in the hollow member B is determined by arranging a plurality of annular projection portions so that the annular groove is a facing portion of the airtight portion constituent element 2a. Then
The entire height or a part of the top of the same component 2a is engaged so that they can be in close contact with each other.

In the two embodiments of claim 4, one of the airtight portions 2 (the airtight portion 2 above the screwing portion 1 in FIGS. 4A and 4B) has the same structure as that of the first embodiment. However, since the other (the airtight portion 2 below the screwing portion 1 in the figure) is different from that of claim 1, the first embodiment is the second embodiment in the fourth embodiment of the first aspect. The respective embodiments correspond to the fifth embodiment of claim 1.

As described above, according to the present invention, the outer peripheral surface of the one end of the hollow member A and the inner peripheral surface of the other end of the other hollow member B are formed with the screwing portions 1 which are screwed into each other. When one hollow member A is fitted into the opening 7 of the other hollow member B and screwed together, the screwing portion 1 prevents loosening. And
Since the airtight portion 2 is provided at a position axially distant from both ends of the screwed portion 1, if one hollow member A is fitted into the opening portion 7 of the other hollow member B, the opening portion will have the airtight portion 2.
Is sealed.

Therefore, even if the two hollow members A and B cause a change over time or an embrittlement phenomenon depending on the materials, the loosening prevention function of the screwed portion 1 and the sealing function of the airtight portion 2 are simultaneously reduced. And then at least one always works. Further, the internal pressure of the other hollow member B is increased, and a screwed portion is applied to an applicator, a coating container, or the like that applies a liquid or paste-like material filled in the hollow member B while extruding from the one hollow member A. When the loosening prevention means by 1 and the sealing means by the airtight portion 2 are applied, when the internal pressure of the other hollow member B is increased, the opening 7 of the hollow member B is opened.
Therefore, it becomes difficult to generate a pressure loss that causes pressure leakage, and it becomes possible to apply the filler while extruding the filler easily and surely.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a specific example of claim 1 of the connection structure of the present invention.

FIG. 2 is an explanatory diagram showing a specific example of claim 2 of the same connection structure.

FIG. 3 is an explanatory diagram showing a specific example of claim 3 of the same connection structure.

FIG. 4 is an explanatory diagram showing a specific example of claim 4 of the same connection structure.

FIG. 5 is an explanatory diagram showing an example of a conventional technique.

[Explanation of symbols]

 A ... Hollow member on one side B ... Hollow member on the other side 1 ... Threaded portion 2 ... Airtight portion 2a ... Airtight portion constituent element of one hollow member 2b ... Airtight portion constituent element of the other hollow member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16B 2/22 F16B 2/22

Claims (4)

[Claims] 1. An outer peripheral surface of one end portion of one hollow member and an inner peripheral surface of the other end portion of the other hollow member are provided with screwing portions which are screwed together, and from both end portions of the screwing portion. A hollow member connection structure in which an airtight portion is provided at a portion that is separated in the axial direction. 2. One of the airtight portion constituent elements of one hollow member is formed of an annular ridge, the other is formed of a smooth peripheral surface, and one of the airtight portion constituent elements of the other hollow member is formed of the annular ridge. 2. A smooth peripheral surface which is in close contact with the smooth peripheral surface, and the other is an annular projection which is in close contact with the smooth peripheral surface.
The hollow member connection structure described. 3. An airtight portion constituent element of one hollow member is formed of an annular ridge, and one of the airtight portion constituent elements of the other hollow member is formed of a smooth peripheral surface to which the annular ridge adheres, and the other is formed. The hollow member connection structure according to claim 1, comprising an annular ridge that is locked and closely attached to the annular ridge. 4. The airtight portion constituent element of one hollow member is formed of an annular ridge, and one of the airtight portion constituent elements of the other hollow member is formed of a smooth peripheral surface to which the annular ridge adheres, and another 2. The hollow member connecting structure according to claim 1, wherein the annular projection is an annular groove that is engaged and closely contacted.