JP2003314765A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint excellent in stability and durability as compared with a conventional one. <P>SOLUTION: This pipe joint has a holding member 3 for gripping a pipe 1 in a joint body 2, and a releasing member 4 for plunging the holding member 3 into the deep side. When the holding member 3 and the inserted pipe 1 are moved in the coming-off direction, the holding member 3 reduces its diameter along a taper surface 7 in the joint body 2 to cut into the pipe 1. The pipe joint has, in the joint body 2, a stranding face 8 for increasing the diameter of the deep-side end or/and the front-side end of the holding member 3. At least either one of the stranding face 8 and an opposite abutting surface 9 at an end of the holding member 3 abutting on each other is shaped into a curved surface. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint having a connecting mechanism for piping such as hoses and tubes.

[0002]

2. Description of the Related Art Conventionally, a pipe joint having a mechanism for holding a hose with a gripper has been used for piping of fluids such as oil, water and air.

There is a demand for a pipe joint in which a pipe for a fluid such as oil, water or air is held by a holding member and the pipe can be pulled out as needed.

As shown in FIGS. 7 and 8, as this pipe joint, for example, a pipe 21 (hose or tube) is used as a joint body 22.
Holding member 23 (gripper) to be held inside and the holding member
With a release member 24 (release) that pushes 23 inward,
When the holding member 23 and the inserted pipe 21 move in the removing direction, the holding member 23 is reduced in diameter along the tapered surface 25 in the joint main body 22 so as to bite into the pipe 21 and the joint main body.
It is conceivable that the inside of 22 has a riding surface 26 for expanding the diameter of the inner end of the holding member 23.

According to this pipe joint, as shown in FIGS. 9 and 10, when the pipe 21 is pulled out, the holding member 23 is pushed inward by the release member 24 so that the end portion of the holding member 23 on the back side is pushed. The diameter is increased by riding on the riding surface 26 in the joint body 22. As a result, the piping by the holding member 23
There is an advantage that the bite into the pipe 21 is released and the pipe 21 can be easily pulled out.

However, if the pipe 21 is repeatedly inserted and removed, there is a concern that the contact edge portion 27 of the holding member 23 may be worn or deformed when riding on the riding surface 26 of the joint body 22. Further, it is conceivable that the surface roughness of the joint body 22 on the riding surface 26 side in terms of manufacturing may affect the slipperiness / stability when the holding member 23 moves up and down. Further, if the angle of the riding surface 26 of the joint body 22 is deviated due to manufacturing, a larger force than necessary is required to ride up and displace the holding member 23, which may cause variations in operability. That is, there was a problem that stability and durability remained a concern.

[0007]

Therefore, the present invention is intended to provide a pipe joint which is more stable and durable than conventional pipe joints.

[0008]

In order to solve the above problems, the present invention takes the following technical means. It has a holding member that holds the pipe in the joint body and a release member that pushes the holding member inward, and when the holding member and the inserted pipe move in the removal direction, the holding member becomes a tapered surface in the joint body. The fitting body has a diameter that reduces the diameter of the holding member so that the fitting body has a riding surface that expands the diameter of the rear end and / or the front end of the holding member. In this pipe joint characterized in that at least one of the surface and the facing contact surface of the end of the holding member is a curved shape, when pulling out the pipe after use,
By pushing the holding member to the back side by the release member, the end portion on the back side and / or the front side of the holding member rides on the riding surface in the joint body, and the diameter is expanded. This releases the holding member from cutting into the pipe, and the pipe can be pulled out.

Further, since at least one of the riding surface and the opposing contact surface of the end portion of the holding member, which are in contact with each other, is formed into a curved surface shape, excessive wear is caused as compared with the case where the holding members abut at the edges (corners). Is less likely to occur, and they abut and move smoothly with each other, and the surface roughness of the riding surface during manufacturing (tool marks, etc.)
It is hard to be affected by the influence of and the manufacturing runout of the angle. The riding surface may be formed on the wall surface on the terminal side in the joint body, on the release member, or on both surfaces.

Which one is to be formed may be selected depending on the material, property, property and the like of the corresponding holding member whose diameter is to be increased. Specifically, for example, the end of the holding member on the side where the diameter is easily expanded is selected. It may be formed on the opposite side.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) As shown in FIGS. 1 to 3, a synthetic resin tubular holding member (gripper) 3 for gripping a synthetic resin pipe (hose) 1 in a joint body 2 is provided. And a cylindrical release member (release) 4 made of synthetic resin for pushing the holding member 3 to the inner side.

In the holding member 3, a plurality of slits (not shown) are formed in parallel alternately from the front and rear of the end portion on the tube insertion port side and the end portion on the rear side to enable expansion and contraction. There is. Further, on the inner peripheral surface of the holding member 3, a plurality of annular projection bands 6 are projected so as to bite into the outer peripheral surface of the pipe 1 and firmly hold it.

When the holding member 3 and the inserted pipe 1 move together in the removing direction during use, the holding member 3
Is a tapered surface 7 in the joint body 2 (tapered inclined surface)
The diameter of the pipe 1 is reduced along the line so as to cut into the pipe 1. The holding member 3 presses down the outer peripheral surface of the pipe 1 as a whole to clamp and tighten it firmly.

Further, in the joint body 2, there is formed a riding surface 8 for enlarging the diameter of the rear end of the holding member 3.
The riding surface 8 is formed on the wall surface on the terminal side of the joint body 2 into which the pipe 1 is inserted. On the other hand, the release member 4 is also formed with a riding surface 8 for enlarging the diameter of the end portion of the holding member 3 on the tube insertion port side. Like this 8
Are formed on both the wall surface on the terminal side in the joint body 2 and the release member 4.

A facing contact surface 9 is formed at the rear end of the holding member 3 so as to face the riding surface 8 on the wall surface on the terminal side where the pipe 1 is inserted in the joint body 2. Opposing contact surface 9 facing the riding surface 8 on the member 4 side
Is formed at the end of the holding member 3 on the tube insertion port side.

By the way, the joint body 2 abutting each other
Of the riding surface 8 on the wall surface on the terminal side and the facing contact surface 9 at the end of the holding member 3, the facing contact surface 9 at the end of the holding member 3 has a curved shape.

Next, the usage state of the pipe joint of this embodiment will be described.

At the initial stage of insertion of the pipe 1 and before use, the holding member 3 made of synthetic resin is only slightly biting on the surface of the pipe 1. When the pipe 1 is pressurized in this state, the pipe 1 and the holding member 3 are integrally moved to the right side in the figure by the internal pressure, and the holding member 3 is reduced in diameter along the taper portion 7 of the inner wall of the joint body 2 to become the pipe 1. I will cut in. Further, when the pipe 1 is pulled by the pulling method while the internal pressure is not yet applied, the pipe 1 and the holding member 3 move integrally to the right side in the drawing, and the holding member 3 shrinks along the taper portion 7 of the inner wall of the joint body 2. The diameter is made and it bites into the pipe 1 in the same manner. The pipe 1 is held by the reduced-diameter deformation of the holding member 3 to prevent the pipe 1 from coming off during use.

When the pipe 1 is pulled out after use, the pipe 1 is first pushed inward. Further, the holding member 3 is pushed inward by the release member 4, so that the end portion of the holding member 3 on the rear side rides on the wall surface on the end side in the joint body 2
It gets into the state where the diameter is expanded by getting on. As a result, the bite of the holding member 3 into the pipe 1 is released, and the pipe 1 can be pulled out. Therefore, even if the holding member 3 bites into the surface of the pipe 1 and the pipe 1 becomes difficult to come off with time,
Can be easily pulled out.

Further, the release member 4 is also formed with a riding surface 8 for enlarging the diameter of the end portion of the holding member 3 on the tube insertion port side, and the holding member 3 enlarges the diameter of the end portion on the back side. Since it is sandwiched between the riding surface 8 in the joint body 2 and the riding surface 8 of the release member 4 that expands the diameter of the pipe insertion port side end of the joint body 2, the pipe 1 of the holding member 3 is deformed. There is an advantage that the bite into is completely released. That is, a force for deforming the holding member 3 is applied to the direction away from the pipe 1, and the holding member 3 expands not only from one end but also from the entire end, so that the holding member 3 is very easily separated.

Furthermore, since the facing contact surface 9 facing the riding surface 8 on the release member 4 side is formed at the end of the holding member 3 on the pipe insertion port side, the riding surface 8 on the release member 4 side and this There is an advantage that the end portion of the holding member 3 on the pipe insertion port side can be expanded more smoothly by the opposed contact surface 9 of the end portion of the holding member 3 on the pipe insertion port side.

In addition, the riding surfaces 8 that abut each other on the wall surface side of the terminal side where the pipe 1 is inserted in the joint body 2.
Since the facing contact surface 9 at the end of the holding member 3 has a curved shape among the facing contact surface 9 at the end of the holding member 3,
Excessive wear is less likely to occur compared to the case of contacting at the edge (corner), and they smoothly contact and change each other, and the influence of surface roughness (tool mark etc.) in manufacturing the riding surface 8 and its angle. It has the advantage that it is not easily affected by manufacturing fluctuations and has excellent stability and durability. (Embodiment 2) Next, Embodiment 2 will be described focusing on the differences from the above embodiment.

As shown in FIG. 4, of the riding surface 8 on the wall surface on the terminal side where the pipe 1 is inserted in the joint body 2 and the facing contact surface 9 at the end of the holding member 3, the riding surface 8 is curved. I am trying. (Embodiment 3) Next, Embodiment 2 will be described focusing on the differences from the above-described embodiment.

As shown in FIG. 5, of the riding surface 8 on the release member 4 side and the facing abutting surface 9 at the end of the holding member 3, the facing abutting surface 9 is curved. (Embodiment 4) As shown in FIG. 6, of the riding surface 8 on the release member 4 side and the facing abutting surface 9 at the end of the holding member 3, the riding surface 8 is curved.

[0025]

The present invention having the above-mentioned structure has the following effects.

Excessive wear is unlikely to occur and they smoothly abut against each other and are displaced, and are less susceptible to surface roughness (tool mark etc.) in manufacturing the riding surface and manufacturing runout of that angle. It is possible to provide a pipe joint that is more stable and durable than before.

[Brief description of drawings]

FIG. 1 is a half sectional view showing a first embodiment of a pipe joint of the present invention.

FIG. 2 is an enlarged view of a main part of the pipe joint of FIG.

FIG. 3 is a half sectional view showing a state in which a release member is pushed in by the pipe joint of FIG.

FIG. 4 is an enlarged sectional view of an essential part showing a second embodiment of the pipe joint of the present invention.

FIG. 5 is an enlarged sectional view of essential parts showing a third embodiment of the pipe joint of the present invention.

FIG. 6 is an enlarged sectional view of an essential part showing a fourth embodiment of the pipe joint of the present invention.

FIG. 7 is a half sectional view showing a conventional pipe joint.

FIG. 8 is an enlarged view of a main part of the pipe joint of FIG.

9 is a half sectional view showing a state in which the release member is pushed in by the pipe joint of FIG.

FIG. 10 is an enlarged view of a main part of the pipe joint of FIG. 9.

[Explanation of symbols]

1 piping 2 Joint body 3 holding member 4 Release member 7 Tapered surface 8 Riding surface 9 Opposing abutment surface

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shinichi Nagai             1300 45 Hachiman, Nabari-shi, Mie Nitta Mua             -In Nabari factory (72) Inventor Nobuyuki Asato             1300 45 Hachiman, Nabari-shi, Mie Nitta Mua             -In Nabari factory (72) Inventor Bunichiro Kameyama             2-5-3 Keihan Hondori, Moriguchi City, Osaka Prefecture             Within Yo Denki Co., Ltd. (72) Inventor Nobuyuki Endo             1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa             Within Fuji Electric Co., Ltd. F-term (reference) 3H015 DA06 DA11                 3H017 HA01

Claims (3)

[Claims] 1. A holding member for holding a pipe in a joint body, and a release member for pushing the holding member to the inner side. When the holding member and the inserted pipe move in a pull-out direction, the holding member becomes a joint body. The inner diameter of the holding member is reduced along the tapered surface of the holding member, and the inner side of the holding member has a riding surface for expanding the diameter of the end portion of the holding member. At least one of the riding surface and the facing contact surface of the end portion of the holding member having a curved shape is a pipe joint. 2. The pipe joint according to claim 1, wherein the riding surface is formed on a wall surface on the terminal side in the joint body. 3. The pipe joint according to claim 1, wherein the riding surface is formed on a release member in the joint body.