JPH0417505Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connection structure for cylindrical members used in manufacturing various containers such as valve cases.

[Conventional technology and its problems]

For example, when manufacturing a resin container with a narrow mouth such as a bottle, the manufacturing method used was
Methods are known in which the cylindrical part is made in one piece by blow molding or rotational molding, or in which the cylindrical part is divided into parts in the axial direction, molded, and then integrated by gluing, ultrasonic welding, or spin welding. When creating a cylindrical part by dividing it, using adhesive means has poor workability and may cause harm to the human body (poisoning, etc.) with chemicals or solvents containing adhesives, or may pose a risk of fire. In addition, special equipment such as a welding machine for welding or other methods is required, and there are also problems such as the need for skill in designing and manufacturing jigs and tools.

[Means for solving problems]

In view of the above points, the present invention has a simple structure,
The purpose is to manufacture containers that can be easily assembled by anyone, have no adverse effects on the human body, and have excellent sealing properties.To achieve this purpose, multiple cylindrical members are connected in series. In the connecting structure, a required number of engagement protrusions are provided on the outer peripheral surface of one end of two cylindrical members facing each other,
An annular groove is formed at the other end that opens toward the end surface and into which the one end is inserted; a hole that engages with the engagement protrusion is provided on the outer peripheral wall of the annular groove; A connecting structure for cylindrical members, characterized in that a seal ring mounting space is provided at the bottom of the cylindrical member, and a seal ring made of a rubber-like elastic material is mounted in the seal ring mounting space in a compressed state between the two cylindrical members. We aim to provide the following.

[Effect]

When connecting cylindrical members using the above connection structure,
The operation can be done with one touch by inserting the end of one cylindrical member into the annular groove provided at the end of the other cylindrical member. The engagement with the hole formed in the outer peripheral wall of the groove prevents the seal ring from falling off, and the seal ring installed in the seal ring installation space provides sufficient sealing performance.
Further, the engagement protrusion and the hole prevent the two cylindrical members from rotating by engaging with each other, and furthermore, once the engagement protrusion and the hole are engaged, the structure is such that they are difficult to come off. In other words, once the engagement protrusion and the hole are engaged, there is a risk that the engagement protrusion and the hole will come off when the outer circumferential wall in which the hole is provided tilts toward the outer circumference for some reason, but according to the configuration of the present invention, the engagement protrusion and hole The outer periphery is used not only on the rear side but also on the front side to engage with the opening periphery of the hole and stop the insertion of the end of one cylindrical member into the annular groove when the engagement protrusion and the hole engage. The engagement will not come off unless the wall tilts significantly toward the outer periphery. On the other hand, if the end of one of the cylindrical members is allowed to be inserted into the annular groove even after the engagement, the engagement protrusion will move away from the opening periphery of the hole on the rear side in the direction of insertion; The farther away they are, the more likely they will be disengaged even if the outer peripheral wall is slightly tilted. Therefore, the present invention provides a connection structure in which the engagement protrusion and the hole are difficult to separate, and the two cylindrical members are difficult to fall out.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 to 3 relating to the first embodiment, the connecting structure of the cylindrical member is the upper part of the figure when separately molding a resin container with a narrow mouth 3 as shown in FIG. It is provided integrally with an annular connecting portion 4 between the cylindrical member 1 and the lower cylindrical member 2, and FIG. 1 shows this connecting portion 4 in an enlarged manner.

That is, in the figure, a cylindrical part 5 having a height h1 is integrally formed at the lower end of the upper cylindrical member 1, and a cylindrical or prismatic protrusion 6 is formed on the outer peripheral surface of the cylindrical part 5 to match the size of the container. They are arranged accordingly.
At the upper end of the lower cylindrical member 2 is an outer peripheral wall 7 with a height h2.
An inner circumferential wall 8 is formed concentrically with a height h3, and is opened upward in the figure between the walls 7 and 8 which are parallel to each other, so that the tip of the cylindrical portion 5 can be freely inserted and removed. An annular groove 9 is formed for insertion and fitting. The outer diameter of the cylindrical portion 5 and the inner diameter of the outer circumferential wall 7 are set to values that are extremely similar, and the outer circumferential wall 7 has a hole 10 that engages with the engagement protrusion 6 and a hole 10 that guides the engagement protrusion 6. An inclined recess 11 is formed (FIG. 2). Further, at the bottom of the annular groove 9, an engaging protrusion 6 and a hole 10 are provided.
When both the cylindrical members 1 and 2 are connected by engaging the
A space 12 having a substantially rectangular cross section and a height (depth) h4 is provided, and a seal ring 13 having a circular cross section is press-fitted into the space 12. The cross-sectional diameter L of this seal ring 13 is larger than the depth h4 of the space 12, and the seal ring 13 is compressed between the lower end surface 5a of the cylindrical part 5 and the bottom wall 9a of the annular groove 9, and has a sealing effect on the part. You will begin to play.

In the container having the above-described connecting structure, the upper and lower cylindrical members 1 and 2 are molded separately, and then the two members 1 and 2 are connected. First, the seal ring 13 is inserted into the annular groove 9. Then, with the protrusion 6 of the upper cylindrical member 1 aligned with the inclined recess 11 of the lower cylindrical member 2, both cylindrical members 1 and 2 are pressed in the direction of pressure contact, and the protrusion 6 is engaged with the hole 10. . Until the projection 6 engages with the hole 10, the projection 6 is connected to the outer peripheral wall 7.
It slides a lot on the inner surface, pushing the outer circumferential wall 7 outward in the radial direction, but at the same time as the protrusion 6 engages with the hole 10, the outer circumferential wall 7 returns to the state shown in the drawing.

Next, a second embodiment of the present invention will be explained with reference to FIGS. 4 to 6. The connecting structure has a different shape and configuration of seal parts such as a seal ring compared to the first embodiment. It is something.

That is, as in the first embodiment, the seal ring 13
If the cross-sectional shape is a simple circle (O-ring) or rectangle (square ring), the crushing force increases as the amount of crushing increases, so the dimensions of each part of the upper and lower cylindrical members 1 and 2 must be set strictly. It is necessary to control the amount of crushing, but if the crushing force becomes too large, workability may decrease or the upper and lower cylindrical members 1 and 2 may
This generates internal stress, which can cause deformation and cracks. The connection structure according to this embodiment addresses this problem, that is, the cross-sectional shape of the seal ring 14 is formed into a substantially inverted concave shape with the upper surface being a flat surface.
The cross-sectional width w1 is formed to be slightly smaller than the width w2 of the annular groove 9, and the tip of the cylindrical portion 5 of the upper cylindrical member 1 is formed to protrude to have an inverted triangular cross-section.

The above-mentioned connection structure has a configuration in which the cylindrical portion 5 with a pointed tip locally presses the seal ring 14, which has a generally inverted concave cross section, to compress and deform it, and a large amount of crushing can be achieved with a relatively small crushing force. In addition to being particularly strong in the areas indicated by A, B, and C in FIG. It also comes into pressure contact with other surfaces and exhibits excellent sealing performance. Further, since the inclined surface 15 is formed at the tip of the cylindrical part 5, the cylindrical part 5 is inserted into the annular groove 9 when connecting the upper and lower cylindrical members 1 and 2, as shown in FIG. By providing a chamfer 16 to the shoulder as shown in the figure, ease of assembly can be further improved. Regarding the tip shape of the cylindrical portion 5, its tip 5b
Strictly speaking, do not make it sharp, but give it an appropriate roundness.

Next, a third embodiment of the present invention will be described with reference to FIGS. 7 to 10. In the connection structure of this embodiment, the cross-sectional shape of the seal ring 17 is formed into a substantially rhombic shape, and its inner diameter ( 1) slightly overlaps the outer diameter dimension (2) of the inner circumferential wall 8 of the lower cylindrical member 2, and the seal ring 17
It is characterized in that it is configured so that it is press-inserted while expanding its diameter and rolling.

That is, the seal ring 17 has a rhombic shape with an axial length w4 (w4 = (1 to 2) W3) that is the same length as the cross-sectional width w3 or up to twice the width w3. The four corners are chamfered in a flat or curved manner, and several annular small protrusions (18, 19 height in actual size: 0.1 to 0.5 mm) are formed on each of the two slopes on the inner diameter side, and the inner diameter is 1. The cross-sectional width w3 has an overlap of about 10 to 30% (1
= 2-2 (0.1 to 0.3) w3), and furthermore, the distance w5 between the two diagonally opposite slopes 21, 21 which are parallel to each other in the cross section is determined by the annular groove 9.
The height (depth) h5 of the space 12 formed at the bottom of
It is formed slightly smaller.

When connecting the cylindrical members 1 and 2 using the above connection structure, first, as shown in FIG.
is hung with its free length by using the hook by the annular small protrusion 19. When the upper and lower cylindrical members 1 and 2 are pressed in the pressure direction from this state, the seal ring 17 is pressed against the cylindrical portion 5 as shown in FIG.
It is pressed by the lower end and rolls clockwise in the figure while expanding its diameter slightly, and when 1=2, it is press-fitted to the bottom of the annular groove 9 (FIG. 7).
An elastic return force in the counterclockwise direction is always acting on the seal ring 17 housed in the bottom part, and the cylindrical part 5
The lower end surface 5a of the annular groove 9 is strongly pressed against the bottom wall 9a of the annular groove 9 at portions D and E, and additionally the side wall of the annular groove 9 is also brought into pressure contact. The lower end surface 5a of the cylindrical portion 5 is preferably inclined upward (at an angle θ) toward the outer diameter in order to easily receive the elastic return force of the seal ring 17 and to make it easier to push the seal ring 17 in. Further, the annular small protrusions 18 and 19 attached to the seal ring 17 are
If the direction of attachment is determined, it is only necessary to provide it on one slope that contacts the locking step portion 20.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. 11 to 14. Since this embodiment is the same as the third embodiment (FIGS. 7 to 10) except for the shape and configuration of the seal ring 23, the following will be explained below.
To explain only the differences, the seal ring 23 is
In its cross section, the base is a square (imaginary) with the length of one side being w6, and rectangular annular protrusions 24 and 25 are provided at the inner and outer diameter ends of a vertically elongated ellipse, and the whole has a modified cross shape that looks like a lantern turned sideways. is formed. The length w6 of one side of the virtual square is set approximately 5 to 30% larger than the depth h6 and width w7 (w7≦h6) of the space 12 formed at the bottom of the annular groove 9, and The inner diameter dimension 3 is the width (height) w8 of the annular protrusion 24 relative to the outer diameter dimension 4 of the inner peripheral wall 8, or the length of the width w8 plus 0 to 30% of the width w9 of the vertically long elliptical portion. It is set to overlap (3=4-2w8),
As a result, the seal ring 23, which is inserted into the bottom (space 12) of the annular groove 9 with an expanded diameter and is rolled, is pressed against the lower end surface 5a of the cylindrical portion 5 and the bottom wall 9a of the annular groove 9 particularly strongly. It comes into pressure contact with the groove wall at eight locations including the G section (Fig. 11).

Next, a fifth embodiment of the present invention will be explained with reference to FIGS. 15 to 17.
The cross-sectional shape of the seal ring 26 is formed into a substantially downward arrow shape, and the seal ring 26 is first attached to the lower end of the cylindrical portion 5 of the upper cylindrical member 1, and then the upper and lower cylindrical members 1,
It is characterized by the fact that it connects the two.

That is, an engagement groove 27 is provided around the upper end of the seal ring 26 in the figure, and an engagement groove 27 is provided at the lower end of the cylindrical portion 5 with a width w11 that is about 10 to 30% larger than the width w10 of the engagement groove 27. A protrusion 28 is provided around the circumference. (w11=
(1.1-1.3)w10). In addition, the dimensions w12, w13, and w14 of the other parts of this seal ring 26 are, conversely,
10 to 30 each for the corresponding dimensions w15, h7, h8 of 2.
% (w12=(1.1~1.3)
w15, w13 = (1.1 to 1.3) h7, w14 = 1.1 to 1.3)
h8).

When the cylindrical members 1 and 2 are connected by the above-mentioned connection structure, the seal ring 26 is attached to the upper cylindrical member 1 in advance by engaging the engagement groove 27 and the engagement protrusion 28, as described above. Then, both cylindrical members 1 and 2 are assembled, and the seal ring 26 press-fitted into the bottom (space 12) of the annular groove 9 comes into pressure contact with the groove wall at eight locations in total. In addition, as shown in the figure, it is preferable to provide a notch 29 for air release on the outer diameter surface of the inner circumferential wall 5.

In the connection structure according to the second to fifth embodiments, each of the seal rings 14, 17, 23, 26 has a larger shape than the conventional O-ring or square ring, which has a simple shape, as shown in the graph of FIG. It has the characteristic that there is little change in crushing force even if the amount of crushing increases, and it is possible to improve workability and prevent excessive internal stress from occurring while maintaining a high level of sealing performance. In each example, the upper and lower cylindrical members 1 and 2, that is, the container body, are made of a synthetic resin material (polyacetal resin, polyamide resin) that has high mechanical strength, is resistant to deformation, and has good recovery properties. , the seal rings 13, 14, 17, 23, and 26 are made of a rubber-like elastic material such as nitrile rubber.

[Effect of idea]

As explained above, the connecting structure of cylindrical members of the present invention allows two cylindrical members to be connected to each other to be connected with one touch very easily without using adhesive or special equipment. It is safe and can reliably seal various liquids and gases by press-fitting the seal ring, and can be used in a wide range of fields such as containers and valve cases. In addition, the connection structure of the present invention allows the engagement protrusion provided on the outer circumferential surface of the end of one cylindrical member to engage with the hole provided on the outer circumferential wall of the end of the other cylindrical member. The two cylindrical members can be prevented from rotating. Further, the cylindrical members connected by the connection structure of the present invention have the engagement protrusion engaged with the opening periphery of the hole not only on the rear side in the direction of insertion but also on the front side, so that one of the cylindrical members is connected by the connecting structure of the present invention. In order to stop the insertion of the end portion into the annular groove when the engaging protrusion and the hole engage, the engaging protrusion and the hole will not come off unless the outer circumferential wall tilts significantly toward the outer circumferential side, thereby preventing it from falling out. It is difficult.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a connection part according to a first embodiment of a connecting structure for cylindrical members of the present invention, FIG. 2 is a perspective view of a main part of the outer peripheral wall, and FIG. FIG. 4 is a sectional view of the main part of the connection part according to the second embodiment,
Fig. 5 is a sectional view of the main part of the seal ring, Fig. 6 is a sectional view of the main part showing the intermediate state of the connection, Fig. 7 is a sectional view of the main part of the connection part according to the third embodiment, and Fig. 8 9 and 10 are sectional views of the main parts showing the intermediate state of the connection. FIG. 11 is a sectional view of the main parts of the connection part according to the fourth embodiment. The figure is a sectional view of the main part of the seal ring, Figure 13 and Figure 1.
Figure 4 is a cross-sectional view of the main part showing the intermediate state of the connection.
FIG. 5 is a sectional view of the main part of the connection part according to the fifth embodiment,
FIG. 16 is a cross-sectional view of a main part of the seal ring, FIG. 17 is a cross-sectional view of a main part showing an intermediate state of the connection, and FIG. 18 is a graph showing the relationship between the amount of crushing of the seal ring and the crushing force. DESCRIPTION OF SYMBOLS 1... Upper cylindrical member, 2... Lower cylindrical member, 4... Connection portion, 5... Cylindrical portion, 6... Engaging protrusion, 7... Outer peripheral wall, 8... Inner peripheral wall , 9... Annular groove, 10... Hole, 12... Space, 13, 14, 1
7, 23, 26...Seal ring.

Claims (1)

[Scope of utility model registration request] In a connection structure in which a plurality of cylindrical members are connected in series, a required number of engagement protrusions 6 are provided on the outer peripheral surface of one end of two cylindrical members 1 and 2 facing each other,
An annular groove 9 is formed at the other end that opens toward the end surface and into which the one end is inserted, and a hole 1 that engages with the engagement protrusion 6 is formed in the outer peripheral wall 7 of the annular groove 9.
0, a seal ring mounting space 12 is provided at the bottom of the annular groove 9, and seal rings 13, 14, 17, 23, made of rubber-like elastic material are provided in the seal ring mounting space 12.
26 is mounted in a compressed state between the two cylindrical members 1 and 2.