JP2002139185A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint capable of preventing a screw-fitting member from falling off unexpectedly due to the vibration during transportation. SOLUTION: A bonding layer for bonding a main body 15 and a nut 16 and fixing them temporarily is provided between a screw thread 24 of the main body 15 and a screw thread 29 of the nut 16 which are in screw-fitting relation. Preferably, the bonding of the main body 15 and the nut 16 due to the bonding layer is released by rotating the nut 16 at rotation torque of 20 to 100 N.cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint used in a piping system for a water supply system or a hot water system.

[0002]

2. Description of the Related Art Conventional joints of this type include, for example,
2. Description of the Related Art There is known a joint provided with a retaining member for retaining an end of a pipe inserted into the joint. The retaining member is held inside the joint by a screwing member connected to the main body by a screwing relationship.

[0003]

This kind of joint is delivered with a retaining member and a screwing member assembled, but the screwing member is loosened and detached due to vibration during transportation. There was a case where it was accidentally dropped from the main body.
If the screwing member comes off from the main body, the retaining member and the screwing member may be lost. And the like.

The present invention has been made by focusing on the problems existing in the prior art as described above. It is an object of the present invention to provide a joint that can prevent a screw member from accidentally falling off due to vibration during conveyance or the like.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to claim 1 comprises a joint having a main body and a screw member connected to the main body by a screwing relation. The gist of the invention is to have a temporary fixing means for temporarily fixing the main body and the screw member by bonding.

According to a second aspect of the present invention, in the joint according to the first aspect, the bonding between the main body and the screw member by the temporary fixing means rotates the screw member with a rotational torque of 20 to 100 N · cm. The gist is that it can be canceled by the following.

According to a third aspect of the present invention, there is provided the joint according to the first or second aspect, wherein at least one of the thread of the main body and the thread of the threaded member in a threaded relationship has an adhesive composition. The gist is that the temporary fixing means is constituted by an adhesive layer formed by applying an object.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention is described by using an end of a pipe constituting a water supply pipe and a polyolefin (crosslinked polyethylene,
An embodiment embodied in a joint for connecting an end of a pipe formed of a synthetic resin material such as polybutene will be described in detail with reference to the drawings. In addition, up, down, left and right in the following description correspond to up, down, left and right in FIG.

As shown in FIG. 1, the joint 11 has, at the left end, a pipe connecting portion 12 to which the end of the pipe (not shown) is connected, and a pipe 13 (see FIGS. 2 and 3). Has a pipe connection portion 14 to the right end. Pipe 1
3 is connected to the joint 11 by inserting the end into the pipe connecting portion 14, and the pipe (not shown) is fitted with the end outside the pipe connecting portion 12.
As shown in FIGS. 1 and 2, the joint 11 includes a cylindrical main body 15, a nut 16 as a screw member attached to the main body 15, a split ring 17 as a retaining member,
It comprises a washer 18, a packing 19, an O-ring 20, a collar 21 and a shaft 22. The main body 15, the nut 16, the split ring 17 and the washer 18 are made of brass, the packing 19 and the O-ring 20 are made of an ethylene-propylene-diene copolymer, and the collar 21 and the shaft 22 are made of polyacetal.

The main body 15 is provided with two threads on the outer peripheral surfaces at both right and left ends.
3, 24. The nut 16 is connected to the right end of the main body 15 in a screwing relation, and the tube (not shown) is connected to the left end of the main body 15 in a screwing relation. The inner peripheral surface at the right end of the main body 15 is a tapered surface 25 that approaches the outer peripheral surface of the main body 15 toward the right side. Further, a cylindrical inner tube portion 26 is provided inside the main body 15. The inner cylindrical portion 26 extends rightward from the inner peripheral surface of the intermediate portion in the axial direction of the main body 15. At the right end of the inner cylinder 26,
An accommodation groove 27 that accommodates the packing 19 is recessed.
There is an annular gap between the inner cylindrical portion 26 and the main body 15,
This gap is the pipe 13 inserted into the pipe connection portion 14.
Is an insertion space 28 that allows the insertion of the.

The ring-shaped packing 19 is provided in the housing groove 27.
And the outer peripheral surface thereof is slightly projected from the accommodation groove 27. Then, the pipe 1 externally fitted to the inner cylindrical portion 26
When the packing 19 is pressed against and engaged with the inner peripheral surface of the pipe 3, the space between the pipe 13 and the inner cylindrical portion 26 is sealed, and the pipe 13 is prevented from falling off.

The nut 16 has a thread 29 on the inner peripheral surface and an annular locking portion 30 extending radially inward from the right end. An adhesive layer 31 (see FIG. 2) is provided between the two threads 24 and 29 of the main body 15 and the nut 16 as temporary fixing means for temporarily fixing the main body 15 and the nut 16 by bonding. The nut 16
It is adhered to the main body 15 by the adhesive layer 31 in a state in which the main body 15 is slightly loosened but not tightly tightened. The main body 15 and the nut 16 by the adhesive layer 31
Is set to a strength that can be released by rotating the nut 16 with a rotation torque of 20 to 100 N · cm. The adhesive layer 31 is formed in a line shape substantially orthogonal to the screw thread 24 by applying an adhesive composition such as an adhesive or a sealant to the screw thread 24 of the main body 15.
The length is a length corresponding to the length of two to four threads of the thread 24. In the present embodiment, a cross-linkable sealant (Pre-Seal F-100 manufactured by Seal End Co., Ltd.) containing a fluoropolymer as a main component was used as the adhesive composition. The coating (adhesive layer 31) formed by this cross-linking type sealant is an elastic body having a suitable plasticity.

The split ring 17 is fitted into the right end of the main body 15 and is held inside the joint 11 by a nut 16. The split ring 17 is formed in a substantially C-shape, and has a configuration in which the diameter can be reduced when a force is applied from the outside toward the radial inside. The outer peripheral surface of the split ring 17 is closer to the inner peripheral surface of the split ring 17 toward the left side, and has a tapered surface 17a which coincides with the inner peripheral surface at the left end.

The washer 18 is formed in a ring shape, and is held in the joint 11 while being interposed between the locking portion 30 of the nut 16 and the split ring 17. The O-ring 20
Is disposed in the inner part of the insertion space 28. Then, the inner wall of the insertion space 28 and the end of the pipe 13 inserted into the insertion space 28 are in close contact with each other to seal between them.

The collar 21 and the shaft 22 constitute checking means for checking the insertion state of the pipe 13 inserted into the insertion space 28. The collar 21 formed in a cylindrical shape is fitted in a through hole 32 formed in a radial direction at an intermediate portion of the main body 15. The through hole 32 is formed so as to communicate with the insertion space 28 at a position corresponding to the inner part of the insertion space 28. One of the shafts 22 is formed in a substantially columnar shape, and is disposed in the through-hole 32 while being fitted into the collar 21. Shaft 22 has through hole 3
2, the upper end thereof is immersed in the through-hole 32, and the lower end projects from the through-hole 32 into the insertion space 28, and the upper end protrudes outward from the through-hole 32. The configuration is such that the lower end can be displaced between a position where the lower end is immersed in the through hole 32 according to the inserted state of the pipe 13.

Next, the operation of the joint 11 configured as described above will be described. The joint 11 is, as shown in FIG.
5 is delivered in a state where the nut 16 and the split ring 17 and other parts are assembled. And the joint 1
When the pipe 13 is connected to the first pipe connecting portion 14, first, as shown in FIG. 3A, the end of the pipe 13 is fitted to the inner cylindrical portion 26, and in this state, the pipe 13 is connected. 11 into the inside. When the pipe 13 is pushed inward, the end of the pipe 13 is pressed against the lower end of the shaft 22 and the shaft 22 is moved upward. As a result, the upper end of the shaft 22 is immersed in the through hole 32. Is displaced to a state of protruding outward from. And
After confirming that the upper end of the shaft 22 protrudes outward, the connection of the pipe 13 is completed by tightening the nut 16 as shown in FIG. 3B. Nut 16
When the nut is tightened, the split ring 17 is pushed leftward by the locking portion 30 of the nut 16 via the washer 18, and the tapered surface 17 a of the split ring 17 is
Are engaged, and the diameter of the split ring 17 is reduced. As a result, the split ring 17 is pressed against and engaged with the outer peripheral surface of the pipe 13, and the end of the pipe 13 is prevented from falling into the insertion space 28.

According to the embodiment described above, the following effects can be obtained. Since the main body 15 and the nut 16 are adhered by the adhesive layer 31, for example, the nut 16 may be
It is possible to prevent the nut 16 from accidentally falling off, for example, by loosening. In addition, the careless dropping of the nut 16 is suppressed, so that the split ring 17 and the washer 1 are prevented.
8 can also be prevented from being inadvertently dropped. Therefore, the joint 11 can be used without reassembling them at the site, and the connection work of the pipe 13 can be performed efficiently. Further, the possibility of loss of the nut 16, the split ring 17 and the washer 18 can be suppressed.

The main body 15 and the nut 1 by the adhesive layer 31
6 is set to a strength that can be released by rotating the nut 16 with a rotational torque of 20 to 100 N · cm, so that the adhesion between the two can be easily released by rotating the nut 16 by hand or tool. can do. Therefore, there is no possibility that troubles such as difficulty in tightening the nut 16 when connecting the pipe 13 occur.

The nut 16 is adhered to the main body 15 by the adhesive layer 31 in a state in which the nut 16 is slightly loosened but not tightly tightened with respect to the main body 15. For this reason,
When connecting the pipe 13, there is no need to once loosen the nut 16, and the end of the pipe 13 can be inserted into the pipe connecting portion 14 as it is, so that the connection work of the pipe 13 can be facilitated.

The adhesive layer 31 is formed on the thread 24 of the main body 15.
Since it is formed by applying an adhesive composition such as an adhesive or a sealant to the substrate, the formation is easy. Moreover, the temporary fixing between the main body 15 and the nut 16 can be realized with a simple configuration of the adhesive layer 31.

The joint 11 includes a nut 16 and a split ring 17
Such components are delivered in a state where they are assembled to the main body 15, so that they take up less space during transportation and storage than when they are not assembled.

The above-described embodiment can be modified as follows. In the above embodiment, the adhesive layer 31 is provided with the screw thread 2 of the main body 15.
4, but may be changed to be formed on the thread 29 of the nut 16. Further, it may be formed on both the thread 24 of the main body 15 and the thread 29 of the nut 16.

In the above embodiment, the adhesive layer 31 is formed only at one position on the screw thread 24, but may be provided at a plurality of positions. Further, in the above embodiment, the adhesive layer 31 is
A line that is approximately perpendicular to the
Although the length is set to correspond to the length of 2 to 4 peaks of 4, the shape, size and arrangement may be arbitrarily changed.

In the above-described embodiment, the present invention is embodied in the joint 11 of a type in which the split ring 17 as a retaining member is held inside the joint 11 by the nut 16.
A joint 41 as shown in FIG. 4, that is, a type in which a lock ring 42 as a retaining member is held inside the joint 41 by a push ring 43 as a screw member may be embodied. When the joint 41 shown in FIG. 4 is supplementarily described, the joint 41 mainly includes a main body 44 and a push ring 43 connected to the main body 44. Screw thread 4 provided on the peripheral surface
5 and a screw thread 46 formed on the outer peripheral surface of the push ring 43. In the case of this joint 41, the thread 45 of the main body 44 and the thread 4 of the pressing ring 43 are provided.
6 is coated with an adhesive composition to form an adhesive layer (not shown in FIG. 4), and the main body 44 and the pressing ring 43 are adhered and temporarily fixed by the adhesive layer. The same effects as those of the above embodiment can be obtained.

A pipe 13 formed of a synthetic resin material
Instead, a pipe formed of a soft metal material such as aluminum or copper may be used. Next, technical ideas that can be grasped from the embodiment will be described below.

[0026] A retaining member for retaining an end of the pipe inserted into the joint is held inside the joint by the screw member.
The joint according to any one of claims 1 to 3. In the case of such a configuration, the inadvertent detachment of the screwing member is suppressed, so that the inadvertent detachment of the retaining member can be suppressed.

The joint according to claim 3, wherein the adhesive layer has a line shape substantially orthogonal to the thread and has a length corresponding to two to four threads. With this configuration, the main body and the screw member can be securely bonded and temporarily fixed while the use of the adhesive composition is suppressed to a small amount.

[0028]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, it is possible to prevent the screw member from accidentally dropping off due to vibration during transportation.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in (1), there is no possibility that troubles such as difficulty in tightening the screw member when connecting the pipes may occur.

According to the invention described in claim 3, according to claim 1
Alternatively, in addition to the effect of the invention described in claim 2, temporary fixing between the main body and the screw member can be realized with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a joint.

FIG. 2 is an exploded perspective view showing a joint.

3 (a) and 3 (b) are half sectional views showing a use state of the joint.

FIG. 4 is a half sectional view showing a joint according to another embodiment.

[Explanation of symbols]

11: Joint, 15: Main body, 16: Nut as screw member, 24: Thread of main body, 29: Thread of nut.

Claims (3)

[Claims] 1. A joint comprising a main body and a screw member connected to the main body in a screwing relationship, the joint having a temporary fixing means for temporarily fixing the main body and the screw member by bonding. A joint characterized by the above-mentioned. 2. The method according to claim 1, wherein the adhesion between the main body and the screw member by the temporary fixing means can be released by rotating the screw member with a rotation torque of 20 to 100 N · cm. Fittings. 3. A temporary fixing means is constituted by an adhesive layer formed by applying an adhesive composition to at least one of a screw thread of a main body and a screw thread of a screw member in a screwing relationship. The joint according to claim 1, wherein the joint is provided.