JP3527836B2 - Pipe fittings - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint having a function of retaining the pipe by tightening the pipe with a retaining ring.

[0002]

2. Description of the Related Art A conventional pipe joint of this type is disclosed in JP-A-7-26.
No. 9762, the structure of the pipe joint is shown in FIG. The pipe joint shown in FIG. 1 includes a connection port portion 2 provided in the joint body 1, a push ring 4 screwed into a threaded portion 3 of the joint body 1, a retaining ring 5 that can be reduced in diameter and is held by the push ring 4. When the push ring 4 is screwed into the threaded portion 3 after the tip end (not shown) of the pipe that has passed through the push ring 4 is externally fitted to the connection port part 2, the retaining ring 5 pressed by the push ring 4 becomes When the pressing force is applied, the diameter of the pipe is reduced and the pipe is tightened from the outside.

A coil spring 6 is fitted in the connection port portion 2, and an engaging portion 7 formed by raising one end of an element wire of the coil spring 6 in the radial direction is connected to the joint body 1 side. It is fitted in axially long guide grooves 8 and 9 formed respectively on the push wheel 4 side. When the locking portion 7 is pushed by the tip portion of the pipe externally fitted to the connection port portion 2, it resists the bias of the coil spring 6 and is guided from the guide groove 9 on the pushing wheel 4 side to the joint body 1.
It is moved to the side guide groove 8. Therefore, in this pipe joint, unless the locking portion 7 is pushed from the guide groove 9 on the push ring 4 side to the guide groove 8 on the joint body 1 side at the tip of the pipe, the push ring 4 cannot be sufficiently tightened, so that the connection It is possible to prevent the situation where the push wheel 4 is tightened while the pipe is not sufficiently inserted into the mouth 2.

[0004]

However, in manufacturing the conventional pipe joint described with reference to FIG. 7, the joint body 1 and the push ring 4 are used.
Since it is necessary to perform processing for forming the guide grooves 8 and 9 on the joint, not only is the manufacturing cost increased, but the formation of the guide grooves 8 and 9 reduces the mechanical strength of the joint body 1 and the push ring 4. There was a problem of doing.

The present invention has been made in view of the above circumstances, and as long as the push ring can be screwed in, it is not necessary to form the guide groove as described above in the joint body or the push ring. The retaining ring ensures that the retaining ring will reliably exert the retaining action on the pipe that has been inserted into the connection port for a sufficient insertion length (outer fitting), and the insertion length of the pipe to the connection port will be insufficient. Therefore, it is an object of the present invention to provide a pipe joint with a simple structure in which the push ring cannot be screwed in and the lack of the insertion length of the pipe can be recognized.

Another object of the present invention is to provide a pipe joint which facilitates the initial assembling of the components of the pipe joint.

[0007]

The pipe joint according to the present invention comprises:
A tubular joint body is provided with a connection port to which a pipe is externally fitted, and by receiving the pressing force of a push ring screwed into the threaded portion of the joint body, the diameter is reduced by an amount commensurate with the screwing amount of the push ring. Due to the reduced diameter, it has a retaining ring for tightening the pipe fitted to the connection opening from the outside, and the tip of the pipe inserted into the push ring can be inserted and the inside of the retaining ring can be inserted. Short cylinder that can be inserted into and removed from
A retaining ring support body having a ring- shaped ring portion, and a contact portion protruding in the radial direction of the ring portion and contacting the tip end surface of the pipe inserted into the ring portion, A projecting portion which is concentrically and shorter than the connecting port portion is provided around the outer periphery of the connecting port portion, and the retaining ring support and the retaining ring are provided between the projecting portion and the connecting port portion. pipe end inserted space and the distal end portion of the inserted into the ring portion of the ring carrier above pipe is inserted is formed, the retainer ring及
And the retaining ring support is positioned outside the pipe end insertion space.
It is arranged on the outer periphery of the above-mentioned connection port so as to be placed .

In the pipe joint of the present invention, the retaining ring is reduced in diameter by an amount corresponding to the screwing amount of the push ring into the threaded portion of the joint body. Therefore, if the ring portion of the retaining ring is fitted inside the retaining ring, even if the pressing force when the push ring is screwed is applied to the retaining ring, the retaining ring will support the retaining ring. The diameter reduction is prevented by hitting the ring portion of the body (the diameter reduction regulation state). If the diameter of the retaining ring is prevented in this manner, it becomes impossible to screw the push ring into the retaining ring to reduce its diameter. In other words, the push ring cannot be screwed in.

On the other hand, the tip of the tube inserted through the push ring is inserted into the ring portion of the retaining ring support, and the tip of the tube pushes the contact portion of the retaining ring support to press the retaining ring support. Is pushed out of the retaining ring and pushed into the tube end insertion space, the retaining ring support releases the retaining ring from reducing the diameter of the retaining ring. Therefore, the retaining ring can be screwed in to reduce the diameter of the retaining ring, and the retaining ring can tighten the pipe from the outside to prevent the retaining ring from coming off. In this way, when the push ring can be screwed in, the tip of the pipe is always inserted into the pipe end insertion space, so if the push ring can be screwed in, only a sufficient insertion length for the connection port can be achieved. It becomes possible to apply the retaining action by the retaining ring to the pipe fitted outside. Therefore, there is no possibility that the pipe will come out due to insufficient insertion length of the pipe.

Protrusion teeth that can be bited into the outer periphery of the pipe are provided on the inner peripheral side of the retaining ring, and protrusion teeth that can be bited into the inner periphery of the pipe are provided on the outer peripheral side of the connection port. Is possible, and such a pipe joint is advantageous in imparting a retaining function to a resin pipe such as a polyethylene pipe.

In the pipe joint according to the present invention, the tip end of the protruding portion is formed with a tapered guide surface whose diameter is gradually reduced toward the pipe end insertion space, whereas the retaining ring is provided on the push ring. A pressing portion for pressing the ring is provided, and when the retaining ring is sandwiched between the guide surface and the pressing portion and the push ring is screwed in, the retaining ring applies the retaining ring to the retaining ring. It is desirable that the pressing force be converted into a force directed in the radial direction by the guide surface so that the retaining ring is reduced in diameter. However, it is preferable that the pressing portion has a length that allows the retaining ring to be pushed into the tube end insertion space.

With this structure, when the push wheel is screwed into the threaded portion of the joint body, it is between the tapered guide surface formed at the tip of the protrusion and the pressing portion provided on the push wheel. The sandwiched retaining ring slides over the guide surface and the pressing portion to reduce the diameter and fit into the tube end insertion space, and the protrusion prevents the diameter of the retaining ring from expanding. When the retaining ring fits into the tube end insertion space in this way, even if the push ring is loosened, the retaining ring will not expand in diameter, so the retaining function of the retaining ring is more reliably exhibited.

[0013]

1 is a partial vertical sectional side view of an embodiment of a pipe joint of the present invention, FIG. 2 is a front view showing a retaining ring 30 and a retaining ring support 40, and FIG. 4 is a partial vertical side view of the retaining ring support 40, FIG. 4 is a partial vertical side view of the initially assembled pipe joint, and FIG. 5 is a pipe in a state in which the retaining ring support 40 is pushed into the pipe end insertion space 14. FIG. 6 is a partial vertical cross-sectional side view of the joint, and FIG. 6 is a partial vertical cross-sectional side view of the pipe joint with the push ring 20 screwed in.

In the pipe joint of FIG. 1, a tubular joint body 1
Is a locking portion 11 of a tool such as a wrench, a cylindrical connection port portion 12 to which a pipe (not shown) is externally fitted and connected, and a connection port portion 12
It has a cylindrical projecting portion 13 and the like projecting concentrically around the outer periphery of the connection port 12, and the connection port portion 12 projects further than the projecting portion 13. A pipe end insertion space 14 is formed between the connection port 12 and the protrusion 13. Further, a plurality of protruding teeth 15 are formed in a ring shape in the axially central portion of the outer periphery of the connection port portion 12. Further, the protruding portion 13 has a tapered guide surface 16 whose diameter gradually decreases as it approaches the tube end insertion space 14, and a male screw portion 17 on the outer periphery thereof.

The push ring 20 has a male screw portion 17 of the joint body 10.
Female threaded portion 21 that can be screwed into the inner and inner collar-shaped pressing portion 2
2 and a tube (not shown) can be inserted concentrically.

As shown in FIG. 1 and FIG. 2, the retaining ring 30 is formed by an elastic ring member having one circumferential cutout, and a plurality of threads (in the example shown in FIG.
The protruding teeth 31 of the strip) are formed in a ring shape.

The retaining ring support 40 has a ring portion 41 having a short cylindrical shape and a ring-shaped contact portion 42 provided at one end of the ring portion 41 in an inner flange shape. The inner diameter of the retaining ring 30 in the natural state is smaller than the outer diameter of the ring portion 41 of the retaining ring support 40.
In addition, the retaining ring support 40 is provided in the pipe end insertion space 1 described above.
4 has an outer diameter and an inner diameter that can be inserted.

In the initial assembled state of the pipe joint, as shown in FIG. 4, the male screw portion 17 of the joint body 10 is connected to the female screw portion 21 of the push ring 20.
Are slightly screwed together and the push ring 20 is temporarily fastened to the joint body 10, and the retaining ring 30 is held between the pressing portion 22 of the push ring 20 and the guide surface 16 of the joint body 10. A ring portion 41 of the retaining ring support body 40 is fitted and held inside 30. As shown in FIG. 2, the retaining ring support 4 is used when the pipe fitting is initially assembled.
When the ring portion 41 of 0 is fitted inside the retaining ring 30 and the retaining ring support body 40 is held by the retaining ring 30 by utilizing the elasticity of the retaining ring 30, Since the body 40 and the retaining ring 30 can be handled as one component, there is an advantage that they can be easily incorporated into the pipe joint.

When the retaining ring support body 40 is fitted inside the retaining ring 30 as shown in FIG. 4 in the initial assembled state of the pipe joint, the retaining ring support body 40 allows the retaining ring 30 to be retained. Is prevented from shrinking. Therefore, even if the retaining ring 30 is sandwiched between the pressing portion 22 of the push wheel 20 and the guide surface 16 of the joint body 10 as shown in FIG. It is impossible to screw in.

On the other hand, as shown by arrow a in FIG.
The tip portion 51 of the tube 50 inserted in the
0 into the ring portion 41 of the tube 50 and push the contact portion 42 of the retaining ring support body 40 with the tip surface 52 of the tube 50 to push the retaining ring support body 40 out of the retaining ring 30 as shown in FIG. When the retaining ring 30 is pushed into the end insertion space 14 (see FIG. 4), the retaining ring support 40 releases the retaining ring 30 from the diameter reduction preventing state. Therefore, the retaining ring 3
0 shrinks due to its own elasticity. At this time, the protruding teeth 31 of the retaining ring 30 are reduced in diameter as shown in FIG.
It is desirable to contact the outer peripheral surface of the.

When the push wheel 20 is further screwed in from the state shown in FIG. 5, the pressing portion 22 of the push wheel 20 presses the retaining ring 30 against the guide surface 16 and slides it, so that the pressing force applied to the retaining ring 30 by the pressing portion 22. Is converted into a force directed in the radial direction by the guide surface 16 and the retaining ring 30 is reduced in diameter by an amount corresponding to the screwing amount of the push ring 20. Then, after the retaining ring 30 is reduced in diameter to the inner peripheral end of the guide surface 16, the retaining ring 30 is further screwed in as shown by the arrow b in FIG. (Fig. 4
). At this time, the protruding teeth 31 of the retaining ring 30 bit into the outer periphery of the tip of the pipe 50,
The projecting teeth 15 of the connection port portion 12 bite into the inner periphery of the tip portion of 0. In the state of FIG. 6, the retaining ring 30 tightens the tube 50 from the outside to prevent it from coming off. In addition, the tip end portion 51 of the tube 50 is inserted deep into the tube end insertion space 14.

As can be seen from the above description, in the above pipe joint, when the push ring 20 can be screwed, the pipe 50
The tip portion 51 is always inserted into the tube end insertion space 14 so that the retaining ring support 40 is pushed into the tube end inserting space 14 from the inside of the retaining ring 30. Therefore, as long as the push ring can be screwed in, the connection port 1
It becomes possible to add the retaining action of the retaining ring 30 to the pipe 50 fitted to the outside by a sufficient insertion length. On the other hand, the pipe 5 for the connection port 12
When the insertion length of 0 is insufficient, the pipe 50
As a result, the retaining ring support 40 is not pushed out of the retaining ring 30, so that the push ring 20 cannot be screwed in as described above.

[0023]

According to the pipe joint of the present invention, as long as the push ring can be screwed in, the retaining action of the retaining ring by the retaining ring on the pipe externally fitted to the connection opening portion by a sufficient insertion length. Is surely demonstrated. In other words, the push ring can be screwed in only when the tip of the pipe has been inserted into the connection port for a sufficient length to allow the retaining ring to exert the retaining action, so the pipe insertion length is insufficient. Detubation due to is reliably prevented. Further, since it is not necessary to form the guide groove as described at the beginning in the joint body or the push ring, the price is low.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional side view of an embodiment of a pipe joint of the present invention.

FIG. 2 is a front view showing a retaining ring and a retaining ring support.

FIG. 3 is a partial vertical cross-sectional side view of a retaining ring support.

FIG. 4 is a partial vertical cross-sectional side view of the pipe joint that has been initially assembled.

FIG. 5 is a partial vertical cross-sectional side view of the pipe joint in a state where the retaining ring support member is pushed into the pipe end insertion space.

FIG. 6 is a partial vertical cross-sectional side view of the pipe joint with the push ring screwed in.

FIG. 7 is a partially longitudinal side view of a conventional pipe joint.

[Explanation of symbols]

10 Joint body 12 Connection port 13 Projection 14 Pipe end insertion space 15 Teeth at connection port 16 guideway 17 Male thread (screw) 20 push ring 22 Pressing part 30 retaining ring 31 Teeth of retaining ring 40 retaining ring support 41 Wheel 42 Hit part 50 tubes 51 Tip of pipe

─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideo Hirabayashi, 153-1, Tajime-cho, Kishiwada-shi, Osaka Prefecture, Japan Steel Pipe Fitting Co., Ltd. (72) Inventor, Yuji Kishimoto, 153-1, Tajime-cho, Kishiwada-shi, Osaka Japan Steel Pipe Fitting Within the corporation (56) Reference JP-A-1-316594 (JP, A) JP-A-5-296378 (JP, A) JP-A-9-42560 (JP, A) JP-A-6-265072 (JP, A) A) Actual Kaihei 1-115093 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 33/22 F16L 21/08

Claims (5)

(57) [Claims] 1. A tubular joint main body is provided with a connection opening for fitting a pipe to the outside, and the pressing force of the push ring screwed into the threaded portion of the joint main body is received to match the screwing amount of the push ring. Has a retaining ring for reducing the diameter of the pipe and tightening the pipe externally fitted to the connection port portion from the outside by the diameter reduction, and the tip portion of the pipe inserted into the push ring can be inserted and A short cylindrical ring part that can be fitted into and removed from the inside of the retaining ring and the tip end surface of the pipe that protrudes in the radial direction of the ring part and is inserted into the ring part come into contact with each other. And a retaining ring support member having a portion, and the coupling body is concentrically provided around the outer periphery of the connection port portion and
A protrusion protruding shorter than the connection port is provided, and the retaining ring support and the ring inserted into the retaining ring support are provided between the protrusion and the connection port. A tube end insertion space is formed in which the tip of the tube is inserted.
The retaining ring and retaining ring support
On the outer circumference of the connection port so that it is located outside the entry space
A pipe joint characterized by being deployed . 2. The pipe joint according to claim 1, wherein the retaining ring is provided on its inner peripheral side with protruding teeth that can be bited into the outer periphery of the pipe. 3. The pipe joint according to claim 1 or 2, wherein projecting teeth that can be bited into the inner periphery of the pipe are provided on the outer peripheral side of the connection port portion. 4. A guide portion having a tapered shape is formed at the tip of the protruding portion, the diameter of which gradually decreases toward the tube end insertion space, while a pressing portion for pressing the retaining ring is provided on the push ring. When the retaining ring is sandwiched between the guide surface and the pressing portion and the push ring is screwed in, the pressing force applied to the retaining ring by the pressing portion is applied by the guide surface. The pipe joint according to any one of claims 1, 2 and 3, wherein the retaining ring is reduced in diameter by being converted into a force directed in a radial direction. 5. The pipe joint according to claim 4, wherein the screwing margin of the push ring into the screw portion of the joint body has a length such that the retaining ring can be pushed into the pipe end insertion space by the pressing portion.