JP2003028371A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint free of loss of parts due to preventing unnecessary fallout of a pipe. SOLUTION: A joint body 4 is provided with a lock ring 2 for holding a pipe 1 and a release 3 for displacing the lock ring 2. When the release 3 is pushed, an inner diameter of the rock ring 2 is enlarged to enable the pipe 1 to pull out. A positional relationship between a recessed portion 6 and a protruding portion 7 formed on the joint body 4 and the release 3 respectively controls a movable range of the release 3. When operation is made to place the recessed portion 6 and the protruding portion 7 in a relative position where they are engaged with each other, the release 3 is pushed, thereby enabling the pipe 1 to pull out.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint which can be used for general pneumatic applications and the like which can prevent inadvertent escape of piping due to human error. It is about. 2. Description of the Related Art Conventionally, one-touch type pipe joints for fluids such as gas and liquid have been used in various fields. As shown in FIG. 9, this pipe joint has a structure in which a pipe 21 is gripped by a lock ring 22. When the pipe 21 is to be removed, a release 23 on the pipe insertion port side is pushed toward the back. Then, the lock ring 22 is pushed out, and its inner diameter is expanded to be larger than the outer diameter of the pipe 21, so that the pipe 21 can be extracted. However, if the release 23 is accidentally pushed by careless operation during use of the pipe joint, there is a problem that the pipe 21 comes out of the pipe joint due to the internal pressure of the fluid, and as a result, the fluid blows out vigorously. there were. Therefore, if a plate-like spacer 24 (for example, a substantially C-shaped section) for preventing displacement of the release 23 of the pipe joint is inserted between the joint body and the release 23, the release 23 is moved in the pipe opening direction. The pipe 21 cannot be pushed, and even if it is accidentally pushed, the pipe 21 does not come off carelessly. [0005] However, since the spacer 24 of the pipe joint is a separate part from the joint main body, there is a problem that the spacer 24 is easily lost during maintenance or disassembly cleaning of the apparatus. Note that a large number of parts leads to an increase in cost. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pipe joint in which parts are not lost in order to prevent inadvertent escape of a pipe. [0007] In order to solve the above-mentioned problems, the present invention employs the following technical means. [0008] The pipe joint of the present invention has a lock ring for gripping the pipe and a release for displacing the lock ring in the joint body, and when the release is pushed in, the inner diameter of the lock ring is enlarged so that the pipe can be extracted. And the movable range of the release is controlled by the positional relationship between the concave portion and the convex portion formed respectively in the joint body and the release, and the relative operating position is adjusted so that the concave portion and the convex portion are fitted. Then, it is characterized in that the pipe can be pulled out by pushing the release. In this pipe joint, the movable range of the release is controlled by the positional relationship between the concave portion and the convex portion formed in the joint body and the release, respectively. There is no need for a spacer or the like for preventing displacement of another part. That is, when the relative position is set such that the concave portion and the convex portion are fitted to each other, the release can be pushed in to pull out the pipe. It is to be noted that a convex portion may be provided on the joint body side and a concave portion may be provided on the release side, and conversely, a concave portion may be provided on the joint body side and a convex portion may be provided on the release side. Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIGS. 1 to 4, the pipe joint of this embodiment comprises a metal claw-shaped lock ring 2 for holding a synthetic resin pipe 1 (hoses and tubes), The joint body 4 has a release 3 (open sleeve) on the tube insertion port side for displacing the lock ring 2. The lock ring 2 is positioned and fixed in the joint main body 4 by a collar 5 made of a synthetic resin (refer mainly to FIG. 4). When removing the pipe 1 from the pipe joint, when the release 3 is pushed toward the back side, the lock ring 2 falls down and is expanded, and its inner diameter is expanded to be larger than the outer diameter of the pipe 1 and expanded. The pipe 1 is in a state where it can be extracted. Further, a concave portion 6 and a convex portion 7 are formed in the joint body 4 and the release 3, respectively. In this embodiment, the convex portion 7 is integrally protruded from the joint body 4 using synthetic resin, and the concave portion 6 is formed.
Is missing on the release 3 side. Convex part 7 on the joint body 4 side
Are provided with a pair at symmetrical positions, and a concave portion 6 is formed at a position corresponding to this on the release 3 side. In addition, the convex portion 7
The combination of the concave portions 6 may be one or plural. The movable range of the release 3 in the pipe insertion / removal direction is controlled by the positional relationship between the concave portion 6 and the convex portion 7,
When the relative position is such that the concave portion 6 and the convex portion 7 are fitted to each other, the release 3 is pushed in so that the pipe 1 can be extracted. Specifically, the release 3 of this pipe joint is
The rotation operation can be performed between a locked state and an unlocked state. In the unlocked state as shown in FIGS. 1 and 2, the concave portion 6 and the convex portion 7 are fitted to each other so that they can be approached. So you can push in release 3,
Withdrawal of the pipe 1 is possible. In the locked state as shown in FIGS. 3 and 4, the concave portion 6 and the convex portion 7 cannot be fitted to each other and cannot be approached. Therefore, the release 3 cannot be pushed in and the pipe 1 cannot be pulled out. In addition,
In order to prevent the joint body 4 and the release 3 from being inadvertently displaced from this locked position, a shallow recess 8 (shallowly fitting) for temporary fixing of the projection 7 of the joint body 4 is provided on the release 3 side.
Is formed. Next, the use condition of the pipe joint of this embodiment will be described. When the pipe 1 is separated from the pipe joint, the release 3 is rotated 1/4 turn (90 degrees) with respect to the joint body 4 from the locked position (see FIGS. 3 and 4). Then, the state shifts to the unlocked state (see FIGS. 1 and 2), and the position of the convex portion 7 and the concave portion 6 are aligned, and the release 3 can be pressed. That is, when the relative position is set such that the concave portion 6 and the convex portion 7 are fitted to each other, the release 3 can be pushed in to pull out the pipe 1. In this pipe joint, the movable range of the release 3 is controlled by the positional relationship between the concave portion 6 and the convex portion 7 formed on the joint body 4 and the release 3, respectively. There is no need for a spacer or the like for preventing displacement of a part separate from the joint main body 4 inserted between the parts, and there is an advantage that the parts are not lost in order to prevent the pipe 1 from accidentally coming out. Further, since it is sufficient to simply rotate the release 3 and push it in, there is an advantage that the operation is easy even in a narrow place where the pipe 1 is crowded. Furthermore, since this can be dealt with by integrally molding the synthetic resin of the joint body 4 and the release 3, there is an advantage that the manufacturing cost can be reduced. If the position of the release 3 is set to the locked state when the fitting is shipped, a person who does not know how to operate accidentally pushes the release 3 by mistake during actual use in which fluid pressure is applied. Therefore, there is an advantage that occurrence of an accident in which fluid is spouted can be suppressed. (Embodiment 2) Next, Embodiment 2 will be described focusing on differences from Embodiment 1. As shown in FIGS. 5 to 8, contrary to the first embodiment, the concave portion 6 is formed on the joint body 4 side, and the convex portion 7 protrudes from the release 3 side. Further, a shallow recess 8 for temporarily fixing the projection 7 of the joint body 4 on the release 3 side so that the joint body 4 and the release 3 do not inadvertently rotate from the locked position (see FIGS. 7 and 8). (Shallow mating)
Is formed. In the unlocked state as shown in FIGS. 5 and 6, the concave portion 6 and the convex portion 7 are fitted to each other so that they can approach each other. Therefore, the release 3 can be pushed in, and the pipe 1 can be pulled out. In the locked state as shown in FIGS. 7 and 8, the concave portion 6 and the convex portion 7 cannot be fitted to each other and cannot be approached. Therefore, the release 3 cannot be pushed in and the pipe 1 cannot be pulled out. The present invention is configured as described above and has the following effects. Since there is no need for a spacer or the like for preventing displacement, which is a separate part from the joint body, it is possible to provide a pipe joint in which parts are not lost in order to prevent inadvertent escape of piping.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pipe joint according to a first embodiment of the present invention in an unlocked state. FIG. 2 is a side view of the pipe joint of FIG. FIG. 3 is a perspective view of the pipe joint of FIG. 1 in a locked state. FIG. 4 is a half sectional view of the pipe joint of FIG. 3; FIG. 5 is a perspective view illustrating a pipe joint according to a second embodiment of the present invention in an unlocked state. FIG. 6 is a side view of the pipe joint of FIG. 5; 7 is a perspective view of the pipe joint of FIG. 5 in a locked state. FIG. 8 is a half sectional view of the pipe joint of FIG. 7; FIG. 9 is a half cross-sectional view illustrating a conventional pipe joint. [Description of Signs] 1 Piping 2 Lock ring 3 Release 4 Joint body 6 Concave part 7 Convex part

Claims (1)

Claims: 1. A joint body having a lock ring for gripping a pipe and a release for displacing the lock ring, and when the release is pushed in, the inner diameter of the lock ring is enlarged to pull out the pipe. While being in a possible state, the movable range of the release is controlled by the positional relationship between the concave portion and the convex portion formed respectively in the joint body and the release, and the relative position such that the concave portion and the convex portion are fitted to each other. A pipe joint characterized in that the pipe can be pulled out by pushing the release when operated.