JP4198390B2 - Fittings with an incorrect piping prevention mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint with an erroneous pipe prevention mechanism that can avoid erroneous coupling of the pipe body to the pipe joint in a pipe joint that can easily couple and detach the pipe body.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, pipe joints that can easily connect and disconnect pipe bodies have been widely used. FIG. 2 is a half cross-sectional view showing such a conventional pipe joint, and a collet 50 that is movable in the axial direction in order from the pipe insertion port side on the inner peripheral surface of the sleeve 3 fixed to the joint body 1. A lock claw 6 capable of expanding and contracting is inserted.
[0003]
In the conventional pipe joint shown in FIG. 2, the pipe body 10 is simply inserted into the joint body 1 in order to join the pipe body 10. Then, the outer surface of the tubular body 10 and the inner surface of the collet 50 come into contact with each other, and the collet 50 moves to the back side as the tubular body 10 is inserted, and comes into contact with the V-shaped lock claw 6 and stops. If the tubular body 10 is further inserted, the outer surface of the tubular body 10 now spreads the inner periphery of the lock claw 6, passes through the O-ring 7 and reaches the innermost part of the joint body 1. When the internal pressure is applied in this state, the tubular body 10 receives a force in a direction away from the joint body 1, but as a result of the inner peripheral end of the lock claw 6 being inserted into the outer surface of the tubular body 10, the tubular body 10 is prevented from being detached. It is. The collet 50 is completely hidden on the inner peripheral surface of the sleeve 3.
[0004]
On the other hand, in order to detach the tube body 10, a release pin may be inserted through the gap between the sleeve 3 and the tube body 10, and the collet 50 may be pushed toward the inner side of the joint body 1 with the release pin. Then, as a result of the tip of the collet 50 expanding the lock claw 6, the lock claw 6 is released from the outer surface of the tube body 10, and the tube body 10 can be pulled out. Although the collet 50 moves to the tube insertion port side as the tube body 10 is pulled out, it is not exposed from the sleeve 3. The reason why the collet 50 is hidden in this way is to prevent the collet 50 from being accidentally pushed.
[0005]
[Problems to be solved by the invention]
As described above, the conventional pipe joint shown in FIG. 2 has a feature that it is very easy to connect and disconnect the pipe body. However, on the other hand, it is possible that another pipe body is coupled to the pipe joint instead of the original pipe body. For example, a nylon tube is used for a truck air brake tube, but there are 50 to 100 tubes per truck. And the same pipe joint is used for all of the mating counterparts, and they are installed side by side in a narrow piping place. Therefore, there is a possibility that the tube is mistakenly joined to a pipe joint of a different line.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pipe joint with an erroneous pipe prevention mechanism that does not connect an erroneous pipe body to the pipe joint while maintaining the ease of coupling and detachment of the pipe body. To do.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and the gist of the present invention is that it can move in the axial direction on the tube insertion port side inside the inner peripheral surface of the sleeve fixed to the joint body. A collet and a lock claw capable of expanding and contracting diameter on the back side of the collet are arranged.When the collet is pushed toward the back side of the joint body, the tip of the collet expands the diameter of the lock claw and the tube A pipe joint that can be detached, and at least when the collet is located on the tube insertion port side, the rear end of the collet is exposed from the tube insertion port of the sleeve, and the exposed portion of the collet is the outer surface of the tube Incorrect piping prevention mechanism, characterized in that the collet is colored with the same color as the identification mark attached to the resin, and the collet is formed of a resin, and is colored in a desired color by adding a pigment when molding the collet. Related to the pipe fittings That.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the pipe joint of the present invention, a collet capable of moving in the axial direction and a lock claw capable of expanding and contracting are inserted in order from the pipe insertion port side on the inner peripheral surface of the sleeve fixed to the joint body. . When the tube is inserted into the joint body, the collet moves to a position where it abuts against the lock claw and stops.When the tube is further inserted, the lock claw is expanded in diameter, and the tube finally becomes the seal material. It reaches the innermost part of the previous joint body. In this respect, the pipe joint of the present invention is the same as the conventional one, and when the internal pressure is applied, the inner peripheral end of the lock claw is inserted into the outer surface of the pipe body, so that it can be coupled by simply inserting the pipe body into the joint body. .
[0009]
Further, in the pipe joint of the present invention, when the collet is pushed toward the back side of the joint body, the tip of the collet expands the diameter of the lock claw, and the pipe body can be detached. Also in this respect, the pipe joint of the present invention is the same as the conventional one, and the pipe body can be easily detached.
[0010]
In this way, the pipe joint of the present invention maintains the simplicity of coupling and detachment, and characteristically, at least when the collet is located on the pipe insertion port side, the rear end of the collet is away from the tube insertion slot of the sleeve. The exposed part of the collet is colored in the same color as the identification display on the outer surface of the tube. That is, a different color identification display is provided for each tube body, and erroneous piping is prevented by coupling with a pipe joint of the same color.
[0011]
This point will be described in more detail. It is also possible to color the joint body and the sleeve if they are simply color-coded. However, since these constitute the outer surface of the pipe joint, there are many opportunities to come into contact with an operator or the like (which is always gripped when the pipe body is joined and detached), and there is a problem that paint and plating are peeled off. In addition, since the joint body and the sleeve are metal members because they are also strength members, coloring must be applied after painting. Then, it will be inferior to productivity and economical efficiency by the part which requires a coloring process.
[0012]
For this reason, first, it is necessary to color an internal part that does not have a fear of peeling off and that can be easily visually recognized from the outside. Second, if it is a part that can be made into a resin, there is an advantage that it can be colored into a desired color simply by adding a pigment during molding.
[0013]
Therefore, the present invention focuses on the collet inserted on the inner peripheral surface of the sleeve, exposes the rear end of the collet at least on the tube insertion port side from the tube insertion port of the sleeve, and colors the exposed portion. It was decided to do. That is, only the rear end of the collet is exposed, and since it is the portion with the smallest outer diameter in the pipe joint, there is almost no contact with an operator or the like. Moreover, it may be a metal or a resin, and in particular, according to resin injection molding, a collet that does not lose color can be easily produced.
[0014]
Note that exposing the collet creates the possibility of inadvertently pushing the collet, leading to unintentional detachment of the tube. Therefore, the collet may be exposed only when it is located on the tube insertion port side, and may not be exposed when the collet moves to the back side as the tube is inserted. In short, the visibility of the colored portion of the collet is compared with the ease of separation, and the degree of exposure may be determined as appropriate according to the use conditions and the like.
[0015]
Thus, the exposure of the rear end of the collet may be always or temporarily, and the colored part may be the entire collet or only the exposed part. However, the exposure means not only protruding in the vertical and horizontal directions of the tube insertion opening, but also being visible when viewed from the front of the insertion opening without protruding.
[0016]
On the other hand, an identification display is attached to the outer surface of the tubular body. The identification display may be formed, for example, by winding a colored tape around the outer periphery of the distal end portion of the tubular body so that the color of the tape matches the color of the collet. However, attaching the identification display includes not only newly attaching a tape or the like, but also the tube itself colored on the entire outer surface or a part thereof.
[0017]
【Example】
Hereinafter, the best embodiment of the pipe joint of the present invention will be described with reference to the drawings. FIG. 1 is a half sectional view showing an example of a pipe joint of the present invention, and shows a state in which a pipe body 10 is coupled to a joint body 1. In this embodiment, the joint body 1 is made of brass, and a brass sleeve 3 is also fixed thereto. A collet 5 made of polybutylene terephthalate and a lock claw 6 made of phosphor bronze are inserted in order from the tube insertion port side on the inner peripheral surface of the sleeve 3. Further, a cover ring 4 made of polybutylene terephthalate is disposed on the back surface of the lock claw 6, and an O-ring 7 made of silicon rubber is fitted in a recessed groove portion of the joint body 1 partitioned by the cover ring 4. In addition, the core metal fitting 2 is inserted in the front-end | tip part of the tubular body 10 of a nylon tube.
[0018]
Since the lock claw 6 has a V-shaped cross section and has elasticity, the diameter of the lock claw 6 can be increased or decreased. Further, the inner peripheral surface of the sleeve 3 is enlarged toward the back so as to secure a storage space when the diameter of the lock claw 6 is increased and to prevent the collet 5 from coming off. Therefore, the collet 5 can move in the axial direction between the lock claw 6 and the reduced diameter portion of the sleeve 3.
[0019]
When the collet 5 is pushed toward the back side of the joint body 1 in the state shown in FIG. 1, the tip of the collet 5 expands the diameter of the lock claw 6. Then, the biting of the lock claw 6 with respect to the outer surface of the tube body 10 is released, and the tube body 10 can be pulled out.
[0020]
By the way, since FIG. 1 is the coupling state of the tubular body 10, the collet 5 is located in the back | inner side. In the embodiment shown in FIG. 1, the rear end is exposed even when the collet 5 is on the back side in this way, and the rear end is always exposed even when the collet 5 is located on the tube insertion port side. It has become. And since the black color is added to the collet 5 at the time of injection molding and the whole is black, the black exposed part of the rear end of the collet 5 is very conspicuous with respect to the brass joint body 1 and the sleeve 3. . It is also easy to make the collet 5 have another color such as yellow.
[0021]
On the other hand, since the entire outer surface of the nylon tube as the tubular body 10 is black, the outer surface of the tubular body 10 is an identification display 11 attached to the outer surface of the tubular body. Moreover, it is easy to use a nylon tube of another color such as yellow as the tube body 10 or to wind a yellow tape or the like around the black nylon tube.
[0022]
In this way, the identification display 11 of 10 colors is attached to the outer surface of the tubular body 10, and the appearance and structure are the same as those of the pipe joint shown in FIG. 1, and only the color of the collet 5 corresponds to the identification display 11 of the tubular body 10. Thus, 10 different color pipe joints were prepared, and actual joining work was performed. As a result, it was confirmed that the combination of the pipe joint and the pipe body to be joined can be easily visually recognized and can be joined in a short time without making a mistake.
[0023]
【The invention's effect】
Characteristically, the pipe joint of the present invention is characterized in that at least when the collet is located on the tube insertion port side, the rear end of the collet is exposed from the tube insertion port of the sleeve, and the exposed portion of the collet is the outer surface of the tube. Since it is colored in the same color as the identification display attached to the pipe, it is possible to easily and reliably avoid erroneous pipe connection to the pipe joint while maintaining ease of connection and disconnection of the pipe.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing an example of a pipe joint according to the present invention, and shows a state in which a pipe body is coupled to a joint body.
FIG. 2 is a half sectional view showing a conventional pipe joint, and shows a state in which a pipe body is coupled to a joint body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Joint body 2 ... Core metal fitting 3 ... Sleeve 4 ... Cover ring 5 ... Collet 5A ... Exposed part of collet 6 ... Lock claw 7 ... O-ring 10 ... Pipe body 11 ... Identification display 50 ... Collet

Claims (1)

On the inner side of the inner peripheral surface of the sleeve (3) fixed to the joint body (1), the collet (5) is movable in the axial direction on the tube insertion port side, and the expansion / contraction diameter is on the back side of the collet (5). A possible locking claw (6) is arranged,
When the collet (5) is pushed toward the inner side of the joint body (1), the tip of the collet (5) expands the diameter of the lock claw (6) and the pipe body (10) can be detached. There,
When at least the collet (5) is positioned on the tube insertion port side, the rear end of the collet (5) is exposed from the tube insertion port of the sleeve (3), and the exposed portion (5A) of the collet (5) is It is colored in the same color as the identification display (11) attached to the outer surface of the tube (10) ,
A pipe joint with an erroneous pipe prevention mechanism, characterized in that the collet (5) is formed of a resin and is colored in a desired color by adding a pigment when the collet (5) is molded .

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