JP2003106490A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure capable of retaining sureness as a joint while improving workability. SOLUTION: This pipe joint comprises a joint body sleeve for inserting a resin pipe to the outside, a cylindrical spring holder positioned in the outer circumference of the resin pipe and having a flange in its outside and a slit in the opposite side, a support ring inserted from the tip of the slit to the spring holder, a support ring regulation part regulating the support ring in the pull-out direction and provided in the tip side of the slit, a stretching spring retained in the contracted state between the flange and the support ring, a guide ring inserted in the sleeve and regulating the fall-down of the slit in the internal circumference, a lock ring provided outside the flange and intruding into the resin pipe by diameter contraction, and an outer cylinder having a tapered surface allowing the diameter contraction of the lock ring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a resin pipe used for a water pipe or the like, and more particularly to a structure capable of completing joint work with a so-called one-touch operation.

[0002]

Various joints have been developed for resin pipes which have been widely used for household water pipes. The applicant also has, for example, JP-A-200
The inventions described in JP-A-0-46272 and JP-A-2001-41378 are being developed. By the way, these technologies are mainly intended to securely connect the resin pipes, and if viewed as connecting work, after inserting the resin pipes into the joint, the outer cylinder such as the cap nut must be manually tightened. . On the other hand, recently, the number of skilled workers is decreasing even in this type of construction, and there is a demand for a joint which can be relatively easily mounted by a worker who is not a skilled worker.

What is called a one-touch joint is known, for example, the techniques described in JP-A-4-119289 and JP-A-2000-266252. Although these joints hold the resin pipe by the internal structure only by inserting the resin pipe, the workability is improved, but there is still room for improvement in terms of the reliability of the joint.

The present invention solves the conventional problems of the one-touch joint, and an object of the present invention is to disclose a structure capable of maintaining the reliability as the joint while improving the workability.

[0005]

In the joint of the present invention, in order to achieve the above-mentioned object, a sleeve of a joint main body through which a resin pipe is inserted, and a flange which is located on the outer periphery of the resin pipe and is on the outer side. , A cylindrical spring holder having a slit on the opposite side, a support ring inserted from the tip of the slit into the spring holder, and a support provided on the tip side of the slit for restricting this support ring in the removal direction. A ring restricting portion, an extension spring that is held in a compressed state between the flange and a support ring, a guide ring that is inserted into the sleeve and restricts the inward collapse of the slit, and an outer side of the flange. A lock ring that is installed in the resin pipe and that bites into the resin pipe due to the diameter reduction, and a taper surface that accommodates these and allows the diameter reduction of the lock ring. Employing a structure consisting of an outer tube having. The spring holder has a function of holding the extension spring in a contracted state on the outer periphery thereof, and has a flange on the outer end and a slit on the opposite side. This cut is
The spring holder is made of a thin material so that it can easily fall inward (buckle). The support ring holds the spring, and holds the spring between the flange and the support ring while the guide ring regulates the collapse of the slit. When the guide ring is disengaged by the insertion of the resin pipe, the notch is collapsed to the inner circumference, the support ring is disengaged from the restriction portion, and the spring is expanded. The expansion of the spring pushes the lock ring against the tapered surface of the outer cylinder, and the lock ring contracts in diameter to bite on the surface of the resin pipe to complete the joint. That is, in the present invention, the joint can be completed by only one operation of inserting the resin pipe into the sleeve.

Further, since the O-ring is compressed by the expansion of the spring by adopting the construction in which the O-ring is provided between the flange and the lock ring via the washer, the sealing property can be improved.

Further, as the support ring restricting portion, a folded-back portion in which a part of the slit is folded back or a means for providing a locking projection at the tip of the slit is selectively adopted. For example, the restriction part of the support ring is completed in the process of manufacturing the spring holder.

Furthermore, a means for providing a confirmation window in the circumferential direction on a part of the tapered surface of the outer cylinder is adopted. This has the function of visually observing the lock ring in a state in which the spring is expanded by the insertion of the resin tube and the lock ring is pressed to press it from the confirmation window. As a result, the completion of the work can be visually confirmed.

[0009]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a half cross section of the pipe joint of the present embodiment, showing a state immediately after the resin pipe S is inserted into the joint. Here, 1 is a joint body, 2 is a body forming a part of the joint body 1, 3 is a sleeve extending from the body 2, and a sleeve for inserting the resin pipe 1 is a bag-shaped outer cylinder. A hole 4 for inserting the resin pipe 1 into
a is provided, and a groove 4b having a diameter reduced toward the inside is provided on the opening side. Then, by fitting the groove 4b through the O-ring 6 into the groove 5 provided near the base of the sleeve 3 and sufficiently larger in diameter than this, the outer cylinder 4 is fixed. Integrated with the joint body. The outer cylinder 4 has a cylindrical shape, and has a diameter-reduced shape having a tapered surface 4c from the middle toward the bag surface side. The sleeve 3 may be a separate member instead of a part of the joint body 1. Further, the outer cylinder and the joint body can be joined together by pinning or the like.

A space is formed between the sleeve 3 and the outer cylinder 4, and the important structure of the present invention is accommodated in this space. That is, a lock ring 7 has a structure in which a saw tooth is formed in the inner circumference while a slit is formed by cutting out a part in the longitudinal direction, and the saw tooth is bited into the resin pipe due to the diameter reduction. 8 is a water-stop O-ring that also serves as a buffer,
9 is a washer. Reference numeral 10 denotes an extension spring, which is accommodated in the outer periphery of the spring holder 11 in a contracted state, and the extension is regulated by an endless support ring 12. Reference numeral 13 is a guide ring which is located at the tip of the resin pipe S before the work and regulates the diameter reduction of the tip of the spring holder 11. Reference numeral 14 is a ring-shaped recess for retracting the guide ring 13 when the work is completed.

FIG. 2 is a perspective view showing the details of the spring holder 11, in which one end of the cylindrical main body 11a is provided with a flange 11b for restricting the extension spring 10 and the other end thereof is provided. A plurality of pieces of slits 11c are provided. Further, in the present embodiment, one outwardly folded back portion 11d is provided, and the support ring 12 functions as a support ring restriction portion that prevents the support ring 12 from falling off in a normal state. The support ring 12 is restricted from falling off by the folded back 11d, and the flange 11
An extension spring 10 is held between b and the support ring 12. By the way, since the end portion of the spring holder 11 is slit into a plurality of pieces, unless otherwise regulated, these slits 11c will buckle to the inner peripheral side.
The folded back 11d falls inward, and the support ring 12
Is coming off. When these structures are incorporated in the joint, the guide ring 13 regulates the collapse of the slit, so the support ring 12 is caught by the folding back 11d, and the spring 10 secures the flange 10b.
Holding between. In addition, although the support ring restricting portion is configured as the folded-back portion 11d in the present embodiment, as long as it does not prevent the slit 11c from easily falling to the inner circumference, a small piece may be attached separately or as shown in an enlarged view in FIG. In addition, it is possible to bend the tip end of the slit to form a protrusion on the outside.

Next, the movement of the spring holder 11, the spring 10, the support ring 12 and the guide ring 13 will be described with reference to FIGS. 4a to 4c. 4a shows a resin pipe S
Is a state immediately after the insertion, and the tip of the resin pipe S is in contact with the guide ring 13. At this time, the guide ring 13 supports the inner circumference of the spring holder 11, so that the slit 11c of the spring holder 11 is prevented from falling toward the inner circumference side. 10
Hold in a contracted state. Next, as shown in FIG. 4b, if the resin pipe S is further pushed in, the guide ring 13 will come off, and if the material of the spring holder 11 that is relatively thin and easily deformed is selected, the slit 11c will be on the inner peripheral side. Since the support ring 12 falls over, the support ring 12 gets over the mountain of the folded back 11d and comes off the spring holder 11. Then, the spring 10 is released from the regulation, and its extension force urges the flange 11b in the extension direction as shown in FIG. 4c.

Next, FIGS. 5a to 5c show the operation of the entire joint. These correspond to Figures 4a to 4c. That is, in FIG. 5a immediately after inserting the resin pipe S, the extension spring 10 is restricted from being extended by the flange 11b of the spring holder 11 and the support ring 12, and by further inserting the resin pipe S, as shown in FIG. 5b. Although the lock ring 7 and the O-ring 8 once move in the insertion direction, by inserting the resin pipe S, the restriction of the support ring 12 is released and the extension spring 10 is extended at a stretch as shown in FIG. 5c. By the extension operation of the spring 10, the lock ring 7 is pressed together with the O-ring 8 against the tapered surface 4c of the outer cylinder 4, and the diameter of the lock ring 7 is reduced by the taper, so that the sawtooth is formed on the surface of the resin pipe S. Bite,
The resin pipe S is securely held. At this time, the extension of the spring 10 is performed at once, so that the extension force causes the flange 11b to hit the washer 9, and the completion of the work can be confirmed by the impact sound. Further, by providing the confirmation window indicated by 15 in FIG. 5 on the outer cylinder 4, the lock ring 7 is provided with the confirmation window 15 when the operation is completed.
You can see the completion of the work visually because you can see through.

By the way, in this embodiment, since the resin pipe S receives almost no resistance from the outside until the guide ring 13 is pushed in by the insertion of the resin pipe S, the operation is smooth even during the insertion work. It is possible to

If the O-ring is used as in this embodiment, the O-ring 8 is forcibly compressed between the lock ring 7 and the washer 9, so that the sealing effect is further improved. Since there is a secondary effect of increasing it, it is preferable to actively provide this.

[0016]

EFFECTS OF THE INVENTION Since the present invention employs the above construction, the lock ring can be bitten into the resin pipe by the extension function of the extension spring by merely inserting the resin pipe deep into the sleeve, and the work can be performed as a so-called one-touch joint. It can be carried out. Further, when the support ring comes off, the spring stretches at once, so that this hits the lock ring and the like, and the completion of work can be confirmed by the impact sound.

Furthermore, if an O-ring is provided between the lock ring and the flange of the spring holder, the sealing performance can be further improved by the compression of the O-ring.

Further, when the support ring restricting portion is formed by folding a part of the slit, the support ring restricting portion can be provided at the same time when the spring holder is manufactured, and the process is simplified.

Furthermore, by providing a confirmation window on the tapered surface of the outer cylinder, the completion of the work can be visually confirmed, and the workability is further improved.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a joint of the present invention.

FIG. 2 is a perspective view showing a spring holder.

FIG. 3 is a sectional view of an essential part showing a modified example of slitting.

FIG. 4 is a partial cross-sectional view showing the operating state of each spring.

FIG. 5 is a partial cross-sectional view showing an overall operation state.

[Explanation of symbols]

1 Joint body 2 Body of joint body 3 sleeves 4 bag-shaped outer cylinder 5 concave 6 O-ring 7 Lock ring 8 Water stop O-ring 9 washers 10 Extension spring 11 Spring holder 12 Support ring 13 Guide ring 14 Ring-shaped recess

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Claims (5)

[Claims] Claim: What is claimed is: 1. A resin pipe joint, comprising a sleeve of a joint body for inserting the resin pipe to the outside, a cylindrical body located on the outer periphery of the resin pipe, having a flange on the outer side and a slit on the opposite side. Of the spring holder, the support ring inserted into the spring holder from the tip of the slit, the support ring restricting portion provided on the tip side of the slit for restricting the support ring in the removal direction, and the flange and the support ring. An extension spring that is held in a compressed state, a guide ring that is inserted into the sleeve and that prevents the slit from falling toward the inner periphery, and that is provided on the outside of the flange that reduces the diameter of the resin pipe. A pipe joint comprising a lock ring that bites into the lock ring and an outer cylinder that accommodates the lock ring and has a tapered surface that allows the diameter of the lock ring to be reduced. . 2. The pipe joint according to claim 1, wherein an O-ring is provided between the flange and the lock ring via a washer, and the O-ring can be compressed by stretching the spring. 3. The pipe joint according to claim 1, wherein the support ring restricting portion is provided with a locking projection on a part of the front end side of the slit. 4. The support ring restricting portion is a folded portion in which a part of the slit is folded back to the outside.
The described pipe fitting. 5. The pipe joint according to claim 1, wherein a confirmation window is provided in a circumferential direction on a part of the tapered surface of the outer cylinder.