KR20090096054A - Resin pipe joint - Google Patents

Abstract

A resin pipe joint is provided to improve separation protection performance of a main ring member by increasing fit ability of a resin pipe with a saw tooth, and to reduce manufacturing cost by using a small number of components. A resin pipe joint includes a joint main body(1), a stopping part(20), a sealing body(50), an indicator(60), and a tube-shape cover(40). The main body includes a contact tube(10). The indicator is comprised of an annular body locating an end position of a resin pipe(100). A hooking unit includes a main ring shape body(25) and a protruded tooth part. The protruded tooth part is installed at a circular convex part(21) of the connection tube. The tube-shape cover includes a cover main body(42).

Description

Joint for resin pipe {RESIN PIPE JOINT}

The present invention relates to a resin pipe joint interposed in a pipeline such as a hot water supply pipe in a house, in particular, a fall prevention action and watertightness of a resin pipe that is susceptible to diameter expansion deformation or refractive deformation. The present invention relates to the above-mentioned resin pipe joint in which measures for improving the sealing property and the connection workability of the resin pipe are taken.

Conventionally, the insertion pipe joint to which the hot water supply / water supply piping etc. which consist of a resin pipe are connected, the prevention function of a resin pipe, the watertight sealing function, the function which can confirm that the resin pipe was connected properly (connection confirmation function), etc. It has been proposed that this can be achieved (see Patent Document 1, for example).

In the insert-type pipe joint proposed by Patent Document 1, the fall prevention function of the resin pipe is fitted to the outer circumferential surface of the resin pipe inserted in the guide tube extending from the joint body from the outside of the resin pipe. It is made to be exerted by biting the bite teeth of the fall prevention ring so as to counter the detachment force. In addition, the connection confirmation function is that the colored insertion guide ring pushed back by the end of the resin pipe when the resin pipe is inserted into the guide cylinder is pushed into the annular space formed around the base of the guide cylinder. It is supposed to be exercised.

(Patent Document 1)

Japanese Patent Publication No. 2005-76854

However, since the insert-type pipe joint of the conventional example proposed by patent document 1 adopts the structure which a fall prevention ring fits in the outer side of a resin pipe, the outer diameter of this pipe joint will become large by that much. In addition to the large size of the insert tube joint, it is often difficult to place it in a narrow space such as a water piping site in the house, and a cylindrical spacer for holding the release preventing ring in place. Since the number of parts required is increased, the number of required parts increases, and the connection work becomes complicated, and as the cost of the parts increases, the cost of the entire joint also increases.

In addition, when the resin pipe after connection is bent at the tip of the guide tube, the action of preventing the resin pipe from falling out against the detachment force applied to the resin pipe is mainly caused by the fall prevention ring fitted to the outside of the resin pipe. Exposed, the frictional resistance of the guide passage resin pipe only serves to assist. Then, under the situation where the resin tube is deflected and deformed at the tip of the guide tube, the influence of the deflection deformation affects the fitting point of the anti-fall ring to the resin tube and the fitting point of the resin tube to the guide tube. It is thought that there is a risk that the omission prevention function may not be sufficiently exhibited by the omission of the omission prevention performance.

Thus, there is a problem that the insertion pipe joint as a conventional example proposed by Patent Document 1 has a problem that the size thereof is difficult to be miniaturized and the cost increases accordingly. Moreover, since the fall prevention action with respect to a resin pipe is mainly exhibited only by a fall prevention ring, especially in the situation where the resin pipe after connection bends and deform | transforms in the front-end | tip part of a guide cylinder, there exists a possibility that connection strength will fall large. there is a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and has been studied in such a manner as to prevent the dropping of the resin tube, so that even when the resin tube inserted into the connection tube is deflected and deformed at the distal end of the connection tube, It is possible to provide a resin pipe joint which can not only obtain a sufficiently large connection strength by exhibiting a fall prevention performance, but also facilitate the downsizing of the size, and also reduce the number of necessary parts so that the cost can be easily reduced. For the purpose of

The resin pipe joint according to the present invention includes a joint main body having a connection tube portion into which a resin tube is inserted, and a pipe wall of a resin tube inserted into the connection tube portion at at least two locations in an axial direction central portion of the connection tube portion and its tip portion.壁) water-tightness in close contact with the locking mechanism which is fitted to the inner surface and prevents the resin tube from being pulled out, and the outer circumferential surface of the connecting tube portion and the inner wall of the pipe wall of the resin tube inserted into the connecting tube portion. An indicator composed of a sealing body which is attached to the connecting tube portion and pushed back by the end portion of the resin tube inserted into the connecting tube portion to indicate an end position of the resin tube. Equipped.

According to the resin pipe joint which employ | adopted this structure, the resin pipe inserted in the connection cylinder part is prevented from coming off by the action of a locking mechanism. By the action of a sealing body, the connection part of a connection cylinder part and a resin pipe is sealed in a watertight state. In addition, the position of the end portion of the resin tube inserted into the connecting cylinder can be visually confirmed directly and intuitively by the indicator.

And especially in this invention, since the locking mechanism engages with the pipe wall of a resin pipe at the axial direction center part of a connection pipe part, and at least two places of its front end part, and prevents the resin pipe fall out, a resin pipe is refracted at the front end of the connection pipe part. Under the situation of deformation and deformation, a high fall prevention performance is exhibited and a sufficiently large connection strength can be obtained, and the engagement mechanism of the locking mechanism against the pipe wall of the resin pipe is the inner wall of the resin pipe. It becomes possible to arrange | position to, and it makes it possible to aim at size reduction easily, and also helps to reduce cost by restraining the required number of parts.

The resin pipe joint according to the present invention has a joint main body including a connection tube portion into which a resin tube is inserted, and an inner surface of the pipe wall of the resin tube inserted into the connection tube portion at at least two locations in the axial direction center portion of the connection tube portion and its tip portion. A locking mechanism which engages and prevents the resin tube from being pulled out, a sealing body which adheres to the outer circumferential surface of the connecting tube portion and the inner wall of the tube wall of the resin tube inserted into the connecting tube portion and imparts watertightness to their close contact points; An indicator made of a ring which is fitted to the connecting tube portion and pushed from the back by the end of the resin tube inserted into the connecting tube to indicate the end position of the resin tube, and the number inserted into the connecting tube portion while covering the indicator from the outside; It is fitted to the outside of the branch pipe to prevent the diameter of the resin pipe from expanding, And a tubular cover to help prevent the load effect.

According to the resin pipe joint which employ | adopted this structure, the resin pipe inserted in the connection cylinder part is prevented from being pulled out by the action of a locking mechanism, and the certainty of the fall prevention effect by such a locking mechanism is assisted by a cylindrical cover. By the action of a sealing body, the connection part of a connection cylinder part and a resin pipe is sealed by the watertight state. In addition, the position of the end portion of the resin tube inserted into the connecting tube portion can be visually confirmed directly and intuitively by the indicator.

Moreover, also in this invention, since the locking mechanism engages with the pipe wall of a resin pipe at the axial direction center part of a connection tube part, and at least two places of its front end part, and prevents the resin pipe from being pulled out, a resin pipe is used in the front end part of the connection tube part. High pull-out performance is exhibited even under the condition of deflection and deformation, so that a sufficiently large connection strength can be obtained, and the engagement mechanism of the locking mechanism against the pipe wall of the resin pipe is the inner wall of the resin pipe. It becomes possible to arrange | position inside, and it is easy to aim at size reduction, and also it helps for cost reduction by suppressing the required parts score less.

In this invention, the said locking mechanism is arrange | positioned axially slidably to the annular groove part located in the outer peripheral surface in the axial direction center part of the said connection cylinder part, and can elastically deform in the expansion-contraction direction of the diameter, and the inner wall of the pipe wall of the said resin pipe Insertion of the resin tube in the annular convex portion provided in at least one axial direction at least at the distal end portion of the connecting tube portion by forming a ring-shaped main ring body having a catching tooth engaged with the hook and the annular groove in the connecting tube portion. It is provided with the angular tooth part which is made in the corner of the front side of a direction, and can be engaged with the inner surface of the pipe wall of the said resin pipe, and a chamfering process is implemented in the corner of the back side of the resin pipe in the annular convex part in the insertion direction. It is preferable that it is done.

According to this invention, when inserting a resin tube into a connection cylinder part, the resin tube rides over an annular convex part unduly by the guide action which the chamfering process part of an annular convex part exerts. Therefore, the effect that a scratch is hard to appear in an inner surface of a pipe wall appears in the insertion process of a resin pipe. In addition, when a detachment force is applied to the resin tube inserted into the connection tube part, the engaging teeth of the main ring-shaped body and the angular teeth of the annular convex part are engaged with the inner wall of the resin tube to resist the detachment force and the resin tube is pulled out. This is avoided. In addition, when the resin pipe is deflected and deformed at the distal end of the connection tube, the angular teeth of the annular convex portion provided on the connection tube itself are engaged with the inner wall of the resin tube to prevent the resin tube from being pulled out. The influence of is hard to reach the engagement point with the main ring-shaped body, and a sufficient fall prevention effect is exhibited, and large connection strength can be ensured.

In this invention, it is preferable that the inclined surface which follows the said resin pipe and makes the said main ring-shaped body which moves in the direction which falls out of the said resin pipe, and enlarges a diameter is added to the said annular groove part. According to this, as the main ring-shaped body moves in the direction in which the main ring-shaped body follows and disengages, the inclined surface protrudes the engaging teeth of the main ring-shaped body outward in the radial direction, so as to engage with the pipe wall of the resin pipe, The certainty of the fall prevention action is increased.

In the present invention, an auxiliary ring shape body having a locking tooth that is fitted to the annular groove and engaged with an inner surface of the tube wall of the resin pipe is added to the locking mechanism, and the auxiliary ring shape body is inserted into the connection tube part. It is possible to employ | adopt the structure which is provided with the inclined guide surface which guides the branch pipe to the front-end | tip of the said engaging tooth, and rides over the engaging tooth. According to this, in the resin tube, since the angular tooth part and the auxiliary ring-shaped body are fitted to two places of the inner wall of the tube wall at the distal end of the connecting tube part, in particular, the influence of the refractive deformation of the resin tube has a main ring shape. It becomes difficult to reach the engagement point with the upper body, and the fall prevention action is exhibited more reliably, thereby securing a large connection strength.

In this invention, the said sealing body is arrange | positioned at the annular recessed part located in the outer peripheral surface of the said connection cylinder part in the position between the said annular groove part and the said annular groove, and elastically contacts the inner surface of this annular recess part and the tube wall inner surface of the said resin pipe. It is preferable to employ | adopt the structure which consists of a sealing ring which adheres in a state. According to this, since a sufficiently long space | interval can be ensured between the sealing point by a sealing ring, and the front-end | tip part of a connection cylinder part, the influence of the refractive deformation of the said resin pipe becomes hard to reach the said sealing point, and it seals It helps to increase the watertight stability by the ring.

In this invention, it is preferable that the said cylindrical cover consists of a cylindrical and transparent cover main body, and the large wheel which fits in the cover main body outside and prevents the diameter expansion deformation of the cover main body, According to this, The indicator pushed from behind by the resin tube is visible through the transparent cover body.

In the present invention, the indicator made of a ring body is provided at the base of the connecting tube part from an initial position that is fitted to the main ring-shaped body from the outside by being pushed backward by the end of the resin tube inserted into the connecting tube part. In contact with the end surface annular surface is moved to the operating position to set the insertion length of the resin tube to an appropriate value, and a color containing white and black color different from the color of the cover body It is preferable to employ a colored structure. According to this, since the indicator of an initial position fits into a main ring shape from the outside, when inserting a resin pipe into a connection cylinder, a main ring shape protrudes and does not prevent the insertion operation of a resin pipe. Therefore, the insertion work of the resin pipe can be smoothly executed without disturbing the main ring-shaped body. In addition, the indicator pushed back by the end of the resin tube abuts against the end annular surface provided on the base of the connection tube portion, and moves to an operation position where the insertion length of the resin tube is set to an appropriate value. The operator has the advantage that the insertion length of the resin tube can be set to an appropriate value only by inserting the resin tube until the indicator makes contact with the end engaging surface, thereby improving workability.

In this invention, it is preferable that the said big wheel is fitted to the said cover main body at the position which covers and hides the said indicator of an initial position, and exposes the said indicator which contact | connected the said end annular surface. According to this, the indicator is covered and concealed by a large ring at its initial position, and is visible through the transparent cover body as described above in the operating position, so that the indicator is noticeable before the resin pipe joint is used. It is not unsightly, and after connecting a resin pipe, there exists the convenience of visually confirming whether the insertion length of a resin pipe is an appropriate value easily. Moreover, in the resin pipe which pushed an indicator from the back and inserted in the connection cylinder part, the cover main body which the pipe wall pressed in the radially outward direction by the main ring-shaped body is reinforced by a large ring, and does not expand and deform a diameter. Since the diameter of the resin pipe is enlarged and the fall prevention action by the main ring-shaped body is impaired since it is supported from the outer side by it, it is difficult to arise. Moreover, since the large ring also exhibits the effect of suppressing the temperature change of the water flowing through the pipe and the diameter expansion deformation of the resin pipe due to heat conduction, the diameter of the resin pipe is enlarged and deformed by the water temperature change and heat conduction. Therefore, the situation in which the fall prevention action by the main ring-shaped body is impaired is less likely to occur.

In this invention, it is preferable that the said cover main body is joined to the said joint main body, and it extends to the front-end | tip part of the said connection cylinder part, and reaches the position which the front-end part covers the said annular groove. According to this, the certainty of the fall prevention action of the resin pipe in the front-end | tip part of a connection cylinder part is improved by the cover main body extended to the front-end | tip part.

In the present invention, in the main ring-shaped body, the outer diameter of the engaging teeth in the natural state is larger than the inner diameter of the resin pipe, and the resin pipe inserted into the connection tube portion is outside the main ring-shaped body. It is configured to reduce the diameter by passing through the resin tube, and to guide the resin tube inserted into the connecting tube portion to the tip of the catch tooth while reducing the diameter, and then to ride over the catch tooth. It is preferable to have a guide surface. According to this, although the resin pipe can be inserted without difficulty, a high fall prevention performance can be obtained.

In the present invention, the main ring-shaped body has a vacancy part at one place in the circumferential direction, and the main ring at a plurality of places with an inner circumferential interval of the main ring-shaped body. It is preferable that a notch is formed to easily reduce the diameter of the shaped body. According to this, the notch formed in the plural places of the inner circumference of the main ring-shaped body easily reduces the diameter of the main ring-shaped body, thereby improving the insertion workability of the resin tube.

In the present invention, the main ring-shaped body may have a composite structure including a cylindrical portion made of resin and the engaging teeth made of metal superposed on the outside of the cylindrical portion, and the main ring-shaped body may be provided. In such a composite structure, since the engaging teeth made of metal are harder than the resin pipe, the engagement of the locking teeth against the pipe wall of the resin pipe is improved, and the anti-falling performance by the main ring-shaped body is improved.

As mentioned above, according to the resin pipe joint which concerns on this invention, even if the resin pipe inserted in the connection cylinder part bends and deform | transforms at the front-end | tip part of the connection cylinder part, the high fall prevention performance is exhibited by the action of a locking mechanism, A sufficiently large connection strength can be obtained. In addition, by adopting the structure in which the locking mechanism is fitted to the inner wall of the resin pipe, it is easy to reduce the size, and furthermore, the required number of parts is reduced, and the cost can be easily reduced. In addition, since it can be comprised so that the indicator may show the action | position which shows the end position of the resin pipe, and the indicator of an initial position may inhibit the protrusion of the main ring-shaped body of the locking mechanism to the radially outward direction, etc. The effect also shows that the workability | operativity of the resin pipe with respect to a connection tube part improves by configuring.

1 is a half side view showing a state of use of a resin pipe joint according to an embodiment of the present invention. FIG. 2 is a half side view showing a state of use of a resin pipe joint according to another embodiment of the present invention. It is a half-section sectional drawing which showed the use condition of the modified example of the resin pipe joint of 2.

In FIG. 1, FIG. 2, FIG. 3, the resin pipe joint (henceforth "joint") (A) has the cylindrical connection cylinder part 10 in the joint main body 1 manufactured by the cutting process. It is provided integrally, and the resin pipe 100, such as a polyethylene pipe, is inserted in the connection cylinder part 10. As shown in FIG. In addition to the fact that the resin pipe 100 inserted into the connection cylinder portion 10 is prevented from being pulled out by the locking mechanism 20 described later at two locations in the axial direction center portion of the connection cylinder portion 10 and the tip portion thereof, In the joint A of FIG. 2, FIG. 3, the cylindrical cover 40 which helps the fall prevention effect by these two locking mechanisms 20 is fitted in the outer side of the resin pipe 100. As shown in FIG. Moreover, the sealing body 50 is interposed between the connection cylinder part 10 and the resin pipe 100, and the watertightness is provided mutually at the installation location of this sealing body 50. As shown in FIG. Moreover, the end annular surface 11 is provided in the base of the connection cylinder part 10, and this end annular surface 11 is between the end surface 110 of the resin pipe 100 inserted in the connection cylinder part 10. FIG. An annular indicator 60 is fitted in the cylinder. Moreover, the connection cylinder part 10 protrudes on one side by inserting the tool engagement part 12 in the joint main body 1, and piping members, such as another joint and piping, are connected to the other side. The splice 13 to be provided is provided in concentric shape, and it is natural that the shape or structure of the splice 13 is not limited to the drawing example.

In this joint A, since the structure which can engage with the pipe wall inner surface 101 of the said resin pipe 100 is employ | adopted as the said locking mechanism 20, the locking mechanism 20 is connected to the resin pipe 100 Since it is not necessary to arrange | position outside the (), it becomes easy to downsize the joint A by that much. The detailed structure of the locking mechanism 20 is demonstrated next with reference to FIG.1 and FIG.2, FIG.4-6, FIG.7-10.

4 is a partial longitudinal side view showing an enlarged main part of FIG. 2, and FIGS. 5 and 6 are partial vertical side views for explaining the operation of the locking mechanism 20 shown in FIG. 4, and the locking mechanism 20 is shown in FIGS. 7 to 10. The main ring shape 25 which is an element of is shown.

As shown to FIG. 1 and FIG. 2, the locking mechanism 20 is arrange | positioned in the axial direction center part of the connection cylinder part 10, and two places of the tip part, and the locking mechanism 20 of the front end part of the connection cylinder part 10 is While it is formed only by performing a constant machining on the connection cylinder part 10, the locking mechanism 20 of the center part of the axial direction of the connection cylinder part 10 performs a constant process to the connection cylinder part 10, and It is comprised by the main ring-shaped body 25 arrange | positioned at a process location.

Of the two locking mechanisms 20, the locking mechanism 20 arrange | positioned at the front-end | tip part of the connection cylinder part 10 is provided in line with two places at the front-end | tip part of the connection cylinder part 10 in the axial direction, as shown in FIG. It is formed by the corner of the insertion direction front side of the resin pipe 100 in each annular convex part 21 which became. That is, the annular convex part 21 is formed by forming the annular groove 14 in the vicinity of the front end of the connection cylinder part 10, and the chamfering process etc. about the said corner of the annular convex part 21 are carried out. An angular shape remains as it is, and an angular tooth portion 22 which can be fitted to the tube wall inner surface 101 of the resin tube 100 is formed by such an angular corner. On the other hand, in the corner 23 of the insertion direction rear side of the resin pipe 100 in each annular convex part 21, a chamfering process (angle chamfering or round chamfering (round processing) may be performed). By doing so, the resin pipe 100 can be smoothly inserted into the connecting tube portion 10 even in a weak press-fit state. In the drawing example, although the annular convex part 21 which has the said angular toothed part 22 is formed in two places lined in the axial direction of the front-end | tip part of the connection cylinder part 10, this point makes the said angular toothed part 22 The annular convex portion 21 to be provided may be formed only at one end of the connecting cylinder portion 10.

On the other hand, the locking mechanism 20 of the axial direction center part of the connection cylinder part 10 is shown also in the wide annular groove part 26 provided in the outer peripheral surface of the connection cylinder part 10 like FIG. It is comprised by arrange | positioning the main ring-shaped body 25 illustrated in FIGS. 7-10 axially slidably.

The main ring body 25 shown in FIG. 7 consists of a metal ring which has a vacancy part in one circumferential direction like the same figure (A), The inner peripheral surface is taper of the said annular groove part 26 It is formed of the tapered sliding surface 27 which slidably polymerizes to the inclined surface 29 which consists of a taper-shaped groove bottom face, and the serrated engagement tooth 28 is provided in the outer peripheral side. It is. In addition, the main ring-shaped body 25 shown in FIG. 8 is the main ring-shaped body 25 in the structure which the main ring-shaped body 25 of FIG. 7 has, as shown to the same figure (A) (B). 25) corresponds to the addition of a V-shaped notch 31 for easily reducing the diameter, and in the drawing example, the notch 31 has a plurality of places (5 places, etc. spaced apart from the inner circumference of the main ring-shaped body 25). )

The main ring body 25 shown in Figs. 7 and 8 is made of metal in its entirety, but this is a composite structure of metal and resin as in the main ring body 25 of Figs. 9 and 10. It is also possible. That is, the main ring body 25 shown in FIG. 9 (A) polymerizes the cylindrical cylindrical part 32 made of resin, and the saw-tooth metal engaging tooth 28 on the outer side of the cylindrical part 32. I am unifying it. In addition, the main ring-shaped body 25 shown in FIG. 9 (B) has the cylindrical cylindrical part 32 made of resin, and the metal engaging tooth 28 and the resin engaging tooth made on the outer side of the cylindrical part 32. (28) are arranged in a sawtooth shape, the metal locking teeth (28) are polymerized on the outside of the cylindrical portion (32) and integrated, and the resin locking teeth (28) are made of a cylindrical portion (32). It is formed integrally with. By the way, in the main ring-shaped body 25 of the composite structure shown to FIG. 9 (A) (B), as shown in FIG. 10 (A), the metal engaging teeth 28 are formed in ring shape, and the cylindrical part 32 is formed. 10) may be inserted into the pole of the pole, or as shown in FIG. 10 (B), the metal engaging teeth 28a may be partially inserted into the settlement part of the resin engaging teeth 28b. do. In addition, FIG.9 (A) (B) has shown the state which reduced the diameter in the direction shown by the arrow P by the main ring-shaped body 25. As shown in FIG.

The diameter of the main ring body 25 shown in FIGS. 7-10 is deformable in the expansion-contraction direction by the elasticity provided to the main ring body 25. And in the state which accommodated the main ring-shaped body 25 in the annular groove part 26 of the connection cylinder part 10 like FIG. 1 and FIG. 2, when the resin pipe | tube 100 is not inserted, the engagement tooth ( The outer diameter (outer diameter in a natural state) of 28 is slightly larger than the outer diameter of the connection cylinder part 10. Further, the locking teeth 28 of the main ring-shaped body 25 are guided to the tip of the locking teeth 28 after the resin pipe 100 inserted into the connecting tube portion 10 is guided. An inclined guide surface 33 for riding over is provided.

1 and 2, the sealing member 50 is connected at a position between the annular groove portion 26 and the annular groove 14 which are formed at regular intervals in the connecting cylinder portion 10. It is comprised by the sealing ring which consists of rubber O rings arrange | positioned at the annular recessed part 15 formed in the outer peripheral surface of the cylinder part 10. As shown in FIG. Then, when the resin tube 100 is inserted into the connecting tube portion 10, the sealing ring is in close contact with the inner surface of the annular recess 15 and the inner wall 101 of the pipe wall of the resin tube 100 in a state of elastic contact with each other. Watertightness is given to a point.

Moreover, the said cylindrical cover 40 shown in FIG. 2 is attached to the joint main body 1 by screwing the female screw 41 of the front-end | tip part with the external thread 16 on the joint main body 1 side, and is connected to a connection cylinder part. It is kept in concentric position with (10). And the cylindrical said indicator 60 which slidably inserted in the connection cylinder part 10 is arrange | positioned in the clearance gap formed between this cylindrical cover 40 and the connection cylinder part 10. As shown in FIG.

FIG. 11 is a partial vertical cross-sectional side view of the joint A in the initial state in which the resin tube 100 is not inserted, and FIG. 12 is an end of the resin tube 100 inserted into the connection tube 10 at the indicator 6. FIG. 13 is a partial longitudinal side view of the joint A in a state where the resin pipe 100 is properly connected to the joint A in a state in which the abutment state is in contact.

The said indicator 60 is set as the inner diameter is substantially equal to the outer diameter of the connection cylinder part 10, and the connection cylinder part 10 and the cylindrical cover in the state which does not have big shake in the connection cylinder part 10 is carried out. It is slidably fitted in the clearance gap with 40. As shown to FIG. In addition, this indicator 60 is covered by the said cylindrical cover 40 from the outer side, and when the joint A is an initial state shown in FIG. 11, it is a main ring-shaped body like FIG. (25) is fitted from the outside. This position is an initial position of the main ring-shaped body 25. Therefore, the indicator 60 of an initial position keeps the main ring shape 25 from protruding from the connection cylinder part 10 by reducing the diameter slightly to resist its elasticity, and also keeps the main ring shape 25 ) Is kept concentric with the connecting tube portion 10.

11 to 13, in this embodiment, the cylindrical cover 40 is fitted outside the cover main body 42 and the cover main body 42 which are made of a cylindrical and transparent resin. The metal large ring 43 which prevents the diameter expansion deformation of the cover main body 42 is provided. In addition to the cover main body 42 being coupled to the joint main body 1 via the above-described female and female screws 41 and 16, the cover main body 42 extends to the front end of the connecting tube portion 10 and the front end thereof. Has reached a position covering the annular groove 14. In addition, the cover main body 43 is positioned at the position where the large ring 43 covers and hides the indicator 60 at the initial position as shown in FIG. 11 and exposes the indicator 60 abutting against the end annular surface 11 as shown in FIG. 13. 42) on the outside.

When connecting the resin pipe 100 to the joint A provided with the above structure, the operation | work which inserts the resin pipe 100 into the connection cylinder part 10 of the joint A of an initial state is performed. In addition, the width | variety of the clearance gap between the connection cylinder part 10 and the cylindrical cover 40 is determined to be substantially equal to the thickness of the pipe wall of the resin pipe 100.

When the resin pipe 100 is opposed to the joint A as shown in FIG. 11, and then the resin pipe 100 is inserted into the connection tube 10 as shown in FIG. 12, the end of the resin pipe 100 is displayed at the initial stage of the operation. Touches the indicator 60 at the initial position. At this time, since the indicator 60 is fitted to the main ring body 25 from the outside, the main ring body 25 is reduced in diameter to hold the main ring body 25 so as not to protrude from the connection tube portion 10. The end of the abutment against the main ring-shaped body 25 does not occur in a situation where the insertion operation is disturbed.

After the end of the resin tube 100 is in contact with the indicator 60 at the initial position as shown in FIG. 12, the resin tube 100 is pushed further, and the indicator 60 is pushed from behind by the end of the resin tube 100. Since it is pressed, the indicator 60 deviates from the main ring-shaped body 25, and the main ring-shaped body 25 is located in the pipe wall inner surface 101 of the resin pipe 100 by this. Therefore, after the indicator 60 has escaped from the main ring-shaped body 25, the resin pipe 100 is pushed while sliding the tube wall inner surface 101 with respect to the main ring-shaped body 25. As shown in FIG. And the insertion length of the resin pipe 100 is decided by the indicator 60 pushed behind by the resin pipe 100 contacting the end annular surface 11 of the joint main body 1 as shown in FIG. This position is the operating position of the indicator 60.

Therefore, the length of the indicator 60 and the end annular surface 11 so that the insertion length of the resin pipe 100 when the indicator 60 abuts against the end annular surface 11 of the joint main body 1 are appropriate values. Only by setting the position of), the operator can simply insert the resin tube 100 into the connection tube 10 until the resin tube 100 cannot be pushed in, so that the proper insertion length of the resin tube 100 can be obtained. It is possible to easily determine. In addition, in this embodiment, since the indicator 60 is pushed in from the initial position, it escapes from the concealed position covered by the large wheel 43, and since the cover main body 42 is transparent, in the middle of insertion In addition to the convenience that the operator can visually check the position of the indicator 60 at any time, after the resin pipe 100 is connected, the indicator 60 is in contact with the end annular surface 11. There is a tendency that it is possible to confirm directly by visual confirmation that the resin pipe 100 is properly connected. Here, when the indicator 60 is colored, since the position of the indicator 60 when it sees with eyes is outstanding, the said convenience improves. In addition, in the case of coloring the indicator 60, the coloring for exerting the above-mentioned convenience may be colored in a color different from that of the transparent cover body 42, although the coloring of white, black, green or blue may be good. This would be desirable.

In this embodiment, when the insertion start time of the resin pipe 100 with respect to the connection cylinder part 10 of the joint A is carried out, the corner 23 of the annular convex part 21 will be made, as demonstrated with reference to FIG. Since it is chamfered, the resin pipe 100 is inserted smoothly without being caught by the annular convex part 21. In addition, when the resin pipe 100 is bent after or in the insertion of the resin pipe 100 in the connection cylinder part 10, as shown in FIG. 5 or 6, the annular convex part 21 is irrespective of the direction of refraction. Since the angular toothed part 22 of () is engaged with the inner wall 101 of the pipe wall of the resin pipe 100, the action of preventing movement of the resin pipe 100 in the disengaging direction is exerted, and thus the refractive deformation of the resin pipe 100 is exerted. The influence of is hard to reach the engagement point with the main ring-shaped body 25 and the close contact point of the sealing body 50. FIG. Therefore, there exists an advantage that the fall prevention effect by the main ring-shaped body 25 and the water-tightness provision effect by the sealing body 50 are hard to be damaged by the refractive deformation of the resin pipe 100.

14 is a longitudinal sectional side view of a main part showing a state when the resin tube 100 is inserted into the connecting tube 10, and FIG. 15 is drawn in a direction in which the resin tube 100 inserted into the connecting tube 10 is pulled out. It is the longitudinal side view of the principal part which showed the state of time.

As shown in FIG. 14, when the resin pipe 100 inserted into the connection tube 10 is not pulled in the direction to be pulled out, the engaging teeth 28 are caused by the elastic restoring force of the main ring-shaped body 25. Is engaged in strong contact with the inner wall 101 of the tube wall, or by the elastic restoring force, the engaging teeth 28 are bitten and engaged with the inner wall 101 of the resin tube 100. Therefore, as shown in FIG. 15, when the resin tube 100 inserted into the connection tube portion 10 is pulled in the direction in which the resin tube 100 is pulled out, the main ring-shaped body 25 together with the resin tube 100 is inclined surface 29 of the annular groove portion 26. ) And the diameter is increased, and the engaging teeth 28 are bitten by the inner wall 101 of the pipe wall of the resin pipe 100 to increase the engagement force. For this reason, the fall prevention action by the main ring-shaped body 25 increases as it is dragged in the direction in which the resin pipe 100 falls out. In addition, in this embodiment, the position of the indicator 60 fitted to the main ring-shaped body 25 from the outside is set as the initial position of the indicator 60, and the position which covers and hides the indicator 60 of the initial position is hidden. Since the large ring 43 of the cylindrical cover 40 is arrange | positioned to it, as shown in FIG. 14 and FIG. 15, the main ring-shaped body 25 suppresses the inner wall 101 of the pipe wall of the resin pipe 100. FIG. When doing so, it is prevented by the large wheel 43 that the situation where the resin pipe 100 and the cover main body 42 swell outward by the suppression action occurs. Therefore, only the cover main body 43 warms the resin pipe 100 and the cover main body 43 with, for example, water flowing through the conduit in an environment in which an action of preventing the diameter expansion of the resin pipe 100 is prevented. Even in an environment in which the softening occurs, the expansion of the diameter of the cover main body 43 is reliably prevented by the large ring 43, so that the large ring 43 is provided to prevent the falling out of the main ring body 25. It helps to prevent degradation.

Subsequently, the joint A shown in FIG. 3 differs from that shown in FIG. 2 in that the connection tube 10 of the joint main body 1 is formed by a thin tube. In addition, this joint A differs from the thing shown in FIG. 2 also in the point which does not make the bottom face of the annular groove part 26 into the inclined surface 29 (refer FIG. 2). The other structure is the same as that of FIG. 2, and the same also about an operation | movement, In order to avoid duplication of description, detailed description is abbreviate | omitted by attaching | subjecting the code | symbol same as the code | symbol attached to FIG.

16 shows another embodiment. In this embodiment, the point which accommodated the auxiliary ring-shaped body 34 which has the engagement tooth in the annular groove 14 of the connection cylinder part 10 differs from the thing of FIG. Other matters and actions are the same as those in FIG. 2. The auxiliary ring-shaped body 34 is a sloping guide surface for guiding the resin pipe 100 inserted into the connecting tube portion 10 to the tip of the locking teeth and then riding over the locking teeth (Figs. 7 and 8, It corresponds to the inclined guide surface 33 shown in FIG. 9). According to this embodiment, since both of the above-mentioned angular teeth part 22 and the engaging teeth of the auxiliary ring-shaped body 34 engage with the pipe wall inner surface 101 of the resin pipe 100, the resin pipe 100 The fall prevention effect of is exhibited more remarkably.

BRIEF DESCRIPTION OF THE DRAWINGS The half-section side view which showed the use condition of the resin pipe joint which concerns on embodiment of this invention.

FIG. 2 is a half-section side view showing a state of use of the joint for resin pipes according to another embodiment of the present invention. FIG.

FIG. 3 is a half-section sectional view showing a state of use of a modified example of the resin pipe joint of FIG. 2. FIG.

4 is an enlarged partial vertical side view of the main part of FIG. 2;

Fig. 5 is a partial vertical side view for explaining the operation of the locking mechanism shown in Fig. 4.

FIG. 6 is a partial vertical side view for explaining the operation of the locking mechanism shown in FIG. 4. FIG.

Fig. 7A is a front view of the main ring body, and Fig. 7B is an enlarged cross-sectional view of a portion along the line IB-VIB of (A).

(A) is a front view of the main ring-shaped body by a modification, (B) is an expanded sectional view of the part along the VIIB-VIIB line | wire of (A).

9A is a front view of the main ring shape according to another modification, and (B) is a front view of the main ring shape according to another modification.

FIG. 10A is an enlarged cross-sectional view of a portion taken along the line A-XA of FIG. 9A, and (B) is an enlarged cross-sectional view of a portion taken along the line XB-XB of FIG. 9B.

11 is a partial longitudinal side view of the joint in an initial state;

12 is a partial vertical side view of the joint in a state where the end of the resin tube abuts on the indicator.

13 is a partial vertical side view of a joint in which a resin pipe is connected to a joint;

Fig. 14 is a longitudinal sectional side view of an essential part showing a state when a resin tube is inserted into a connection cylinder;

The longitudinal side view of the principal part which showed the state at the time of dragging in the direction which the resin pipe inserted in the connection cylinder part comes out.

Fig. 16 is a half side view of an essential part in a use state of another embodiment;

* Explanation of symbols for the main parts of the drawings

A: Resin Pipe Joint

1: joint body

10: connection tube

11: end annular surface

14: fantasy home

15: annular recess

20: locking mechanism

21: annular convex

22: Angular tooth

25: main ring shape

26: annular groove

28: Jamming Tooth

29: slope

31: notch

32: barrel shape

33: sloped guide surface

34: auxiliary ring shape

40: barrel shape cover

42: cover body

43: great wheel

50: seal

60: indicator

100: resin tube

101: inner wall of the resin pipe

Claims (13)

A joint body provided with a connecting tube portion into which a resin pipe is inserted, A locking mechanism that engages with an inner surface of a pipe wall of a resin pipe inserted into the connection pipe at at least two positions in an axial direction central portion of the connection pipe and its front end, and prevents the resin pipe from falling out; A sealing body in close contact with an outer circumferential surface of the connecting tube portion and an inner surface of the pipe wall of the resin tube inserted into the connecting tube portion, to impart watertightness to their close contact points; It is provided with an indicator which consists of an annular body which shows the end position of the said resin pipe by being pushed in behind by the edge part of the said resin pipe inserted in the said connection cylinder part, and inserted in the said connection cylinder part, It is characterized by the above-mentioned. Resin Pipe Joints. A joint body having a connecting tube portion into which a resin pipe is inserted; A locking mechanism that engages with an inner surface of the pipe wall of the resin pipe inserted into the connection pipe at at least two locations in the axial direction central portion of the connection pipe and its tip, and prevents the resin pipe from falling out; A sealing body in close contact with the outer circumferential surface of the connecting tube portion and the inner wall of the tube wall of the resin tube inserted into the connecting tube portion, and providing watertightness to their close contact points; An indicator composed of a ring which is inserted into the connecting tube and pushed from behind by the end of the resin tube inserted into the connecting tube to indicate an end position of the resin tube; It is provided with the cylindrical cover which covers this indicator from the outer side, fits on the outer side of the resin pipe inserted in the said connection cylinder part, prevents the diameter expansion of the resin pipe, and helps prevent the fallout by the said latch mechanism. Resin Pipe Joints. The said locking mechanism is axially slidably arrange | positioned at the annular groove part located in the outer peripheral surface in the axial direction center part of the said connection cylinder part, and elastically deformed in the diameter-expansion-reduction direction of Claim 1 or Claim 2. A main ring-shaped body for prevention of release having an engaging tooth that is engaged with the inner wall of the pipe wall of the resin pipe, and an annular groove formed in the connection tube to form at least one axial direction at one end of the connection tube. Of the resin pipe in the annular convex portion, having an angular tooth portion formed at a corner on the front side of the resin tube in the annular convex portion provided, and which can be engaged with an inner surface of the pipe wall of the resin tube. A resin pipe joint, wherein a chamfering process is applied to a corner on the rear side in the insertion direction. 4. An inclined surface is formed in the annular groove portion according to claim 3, characterized in that an inclined surface is formed in the annular groove portion to follow the resin tube and to expand the diameter by climbing the main ring-shaped body moving in the direction in which the resin tube is pulled out. Resin pipe joint. The auxiliary ring-shaped body according to claim 3 or 4, wherein an auxiliary ring-shaped body having a locking tooth that is fitted to the annular groove and engaged with the inner wall of the tube wall of the resin pipe is added to the locking mechanism. A resin pipe joint, comprising: an inclined guide surface for guiding the resin pipe inserted into the connection tube to the tip of the locking tooth and then riding over the locking tooth. The said sealing body is arrange | positioned in the annular recessed part located in the outer peripheral surface of the said connection cylinder part in the position between the said annular groove part and the said annular groove, The annular recessed part in any one of Claims 3-5. A resin pipe joint comprising: a sealing ring in close contact with an inner surface and an inner surface of a tube wall of the resin pipe in an elastic contact state. The cylindrical ring according to any one of claims 2 to 6, wherein the cylindrical cover is fitted to the outside of the cylindrical and transparent cover body and the cover body so as to prevent diameter expansion deformation of the cover body. A joint for resin pipe, characterized in that consisting of). The said indicator which consists of a ring is fitted to the said main ring-shaped body externally by pushing back by the edge part of the said resin pipe inserted in the said connection cylinder part, The said ring indicator of any one of Claims 3-7. While contacting the end annular surface provided on the base of the connecting tube portion from the initial position to move to the operating position where the insertion length of the resin tube is set to an appropriate value, the color may include white and black. It is colored by the color different from the color of a cover main body, The resin pipe joint characterized by the above-mentioned. The said main wheel is fitted externally to the said cover main body in the position which covers and hides the said indicator of an initial position, and exposes the said indicator which contact | connected the said end annular surface. Resin pipe joint. The said cover main body is coupled to the said joint main body, and extends to the front-end | tip part of the said connection cylinder part, The front end part reaches the position which covers the said annular groove, The said cover main body in any one of Claims 7-9. Resin pipe joint characterized in that. The said main ring-shaped body is an outer diameter of the engaging tooth in a natural state larger than the inner diameter of a resin pipe, and the said connection cylinder part in any one of Claims 3-10. The resin tube inserted into the main ring-shaped body is fitted to the outside to reduce the diameter to pass through the resin tube, and while the resin tube inserted into the connecting tube portion is reduced in diameter, A resin pipe joint, comprising: an inclined guide surface for guiding the tip to the tip and passing over the catch teeth. The said main ring-shaped body has a vacancy part in one place of the circumferential direction, and is the inner periphery of the main ring-shaped body in any one of Claims 3-11. A resin pipe joint, characterized in that a notch is formed at a plurality of spaced intervals to easily reduce the diameter of the main ring-shaped body. The said main ring-shaped body is a complex structure in any one of Claims 3-12 provided with the cylindrical part which consists of resin, and the said latch tooth which consists of metal superimposed on the outer side of the cylindrical part. Resin pipe joint characterized in that there is.

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