JP4359704B2 - Plastic pipe fittings - Google Patents

Description

  The present invention improves joints for resin pipes interposed in pipelines such as hot water supply pipes in homes, in particular, the resin pipe retaining action, water-tight sealability, and resin pipe connection workability that are likely to cause expansion and bending deformation. It is related with the said joint for resin pipes in which the countermeasure for is taken.

  Conventionally, plug-in fittings to which hot water / water supply pipes made of resin pipes are connected have a function to prevent resin pipes from being removed, a watertight seal function, and a resin pipe to be properly connected. A device capable of exhibiting (connection confirmation function) has been proposed (see, for example, Patent Document 1).

In the plug-in type pipe joint proposed by Patent Document 1, the resin pipe retaining function is fitted on the outer peripheral surface of the resin pipe inserted into the guide tube extending from the joint body, outside the resin pipe. It is designed to be exerted by biting the biting teeth of the retaining ring that is used to counter the pulling force. In addition, the connection confirmation function is such that a colored insertion guide ring that is pushed by the end of the resin tube when the resin tube is inserted into the guide tube is pushed into an annular space formed around the root of the guide tube. It has come to be demonstrated by being.
Japanese Patent Laid-Open No. 2005-76854

  However, since the plug-in type pipe joint as the conventional example proposed by Patent Document 1 adopts a configuration in which the retaining ring is fitted to the outside of the resin pipe, the outer diameter of the pipe joint is increased accordingly. As a result, plug-in fittings have become larger, which can make it difficult to deploy in confined spaces such as in water around the house, as well as cylindrical spacers to keep the retaining ring in place. Since it is necessary extra, the number of necessary parts increases accordingly and the connection work becomes complicated. In addition, the cost of parts is high and the overall cost of the joint is also high.

  Also, when the connected resin tube is bent at the tip of the guide tube, the action of preventing the resin tube from being pulled out against the pulling force applied to the resin tube is fitted to the outside of the resin tube. This is mainly exhibited by the retaining ring, and the frictional resistance between the guide tube and the resin tube only acts as an auxiliary. Under the situation where the resin tube bends and deforms at the tip of the guide tube, the influence of the bend deformation affects the fitting position of the retaining ring with respect to the resin tube and the fitting position of the resin tube with respect to the guide tube. It is considered that there is a risk that the retaining performance of the steel will be impaired, and the sufficient retaining performance may not be exhibited.

  Thus, the plug-in type pipe joint as the conventional example proposed by Patent Document 1 has a problem that it is difficult to reduce its size and a problem that the cost is high. Further, since the retaining action on the resin pipe is mainly exhibited only by the retaining ring, the connection strength is lowered particularly in a situation where the resin pipe after connection is bent and deformed at the distal end portion of the guide tube. There is a problem that the fear is great.

  The present invention has been made in view of these problems, and by devising a locking mechanism or the like for preventing the resin tube from coming off, the resin tube inserted into the connection tube portion is made of the connection tube portion. Even in situations where the tip is bent and deformed, high retaining performance is demonstrated and sufficiently high connection strength is obtained, and it is easy to reduce the size and the number of required parts is reduced. It aims at providing the coupling for resin pipes which makes it easy to aim at cost reduction.

  The joint for resin pipes according to the present invention is inserted into the connecting cylinder part at least at two places, that is, a joint body provided with a connecting cylinder part into which the resin pipe is inserted, a central part in the axial direction of the connecting cylinder part, and a tip part thereof. A locking mechanism that engages with the inner surface of the tube wall of the resin tube and prevents the resin tube from being removed, and an outer peripheral surface of the connection tube portion and an inner surface of the tube wall of the resin tube that is inserted into the connection tube portion. A seal body that closely adheres and provides water tightness to those close locations, and an end of the resin tube by being pushed by the end of the resin tube that is fitted into the connection tube and inserted into the connection tube An indicator composed of an annulus that indicates the position of the portion, and is fitted on the outside of the resin tube that covers the indicator from the outside and is inserted into the connecting tube portion to prevent the resin tube from expanding, thereby preventing the resin tube from expanding. With a cylindrical cover that helps prevent It is equipped with a.

  According to the joint for resin pipes adopting this configuration, the resin pipe inserted into the connecting cylinder portion is prevented from being detached by the action of the locking mechanism, and the certainty of the retaining action by such a locking mechanism is ensured by the cylindrical cover. Assisted. The connection portion between the connecting tube portion and the resin pipe is sealed in a watertight manner by the action of the sealing body. In addition, the position of the end of the resin tube inserted into the connecting cylinder portion can be directly and intuitively visually recognized by the indicator.

  And especially in this invention, since the locking mechanism engages with the tube wall of the resin tube at at least two places, that is, the axially central portion of the connecting tube portion and the tip portion thereof, the resin tube is prevented from being removed. Even when the pipe is bent and deformed at the tip of its connecting cylinder, high retaining performance is demonstrated and sufficiently high connection strength is obtained, and the engaging part of the locking mechanism with the pipe wall of the resin pipe Since this is the inner wall of the resin pipe, it is possible to install a locking mechanism inside the resin pipe, which makes it easier to reduce the size and reduce the number of required parts. It helps to make reductions easier.

In the present invention, the locking mechanism is disposed in an annular groove portion located on the outer peripheral surface of the connecting tube portion in the axial direction center so as to be slidable in the axial direction, and is elastically deformable in the expansion / contraction diameter direction, and the resin. A retaining main ring body having engagement teeth engaged with the inner surface of the tube wall of the tube, and the main ring body has an outer diameter of the engagement teeth in a natural state larger than an inner diameter of the resin tube; The resin tube inserted into the connecting tube portion is configured to reduce the diameter by being externally fitted to the main ring body and pass the resin tube,
  The indicator made of annulus is formed so that the inner diameter thereof is substantially the same as the outer diameter of the connecting cylinder part, and the main ring body is reduced in diameter against its elasticity so as not to protrude from the outer peripheral surface of the connecting cylinder part. Hold the main ring body in a concentric position with the connecting cylinder part, and slidable between the gaps between the connecting cylinder part and the cylindrical cover. Are combined.

From this, when inserting the resin tube into the connecting cylinder part, the end of the resin tube hits the indicator at the initial position at the initial stage of the work, but at this initial position, the indicator is externally fitted to the main ring body. Since the main ring body is reduced in diameter and is held so as not to protrude from the connecting cylinder part, the end of the resin tube hits the main ring body, and the resin tube cannot be inserted into the connecting cylinder part. Never happen.
After the end of the resin tube hits the indicator at the initial position, when the resin tube is further pushed in , the diameter of the main ring body is reduced by both the inner surface of the indicator and the inner surface of the tube wall at the end of the resin tube . state occurs, further when pushed the resin pipe, and the indicator fitted from engagement in the main ring body is maintained while being reduced in diameter of the main ring body by Kankabenai surface of the end portion of the even resin pipe out The resin tube can be smoothly pushed into the connecting tube portion with the diameter of the main ring reduced by the inner surface of the tube wall of the resin tube.

  Therefore, since the indicator at the initial position is fitted outside the main ring body, when the resin pipe is inserted into the connecting cylinder portion, the situation where the main ring body protrudes and the resin pipe cannot be inserted does not occur. Therefore, the resin pipe can be inserted smoothly without being obstructed by the main ring body.

In addition, while the resin tube can be inserted without difficulty , when a pulling force is applied to the resin tube inserted into the connecting tube portion, the engagement of the main ring body engages with the inner surface of the tube wall of the resin tube. The resin tube is prevented from slipping out against the pulling force, and high retaining performance is obtained.

In the present invention, the locking mechanism includes a resin in the main ring body and an annular convex portion provided in at least one axial direction of the distal end portion of the connecting tube portion by forming an annular groove in the connecting tube portion. A corner toothed portion on the front side of the tube insertion direction and engageable with the inner surface of the tube wall of the resin tube, and chamfered on the corner on the rear side of the resin tube insertion direction in the annular convex portion It is desirable that it has been processed.

  According to the present invention, when the resin tube is inserted into the connecting tube portion, the resin tube easily gets over the annular convex portion by the guiding action exhibited by the chamfered portion of the annular convex portion. Therefore, an effect is obtained that the inner surface of the tube wall is hardly damaged in the process of inserting the resin tube. In addition, when an extraction force is applied to the resin tube inserted into the connecting tube portion, the engagement of the main ring body and the angular tooth portion of the annular convex portion engage with the inner surface of the tube wall of the resin tube. Resisting the force, the resin tube is prevented from coming off. In addition, when the resin tube is bent and deformed at the tip of the connecting tube portion, the angular teeth of the annular convex portion provided on the connecting tube portion itself engage with the inner surface of the tube wall of the resin tube to Since it is prevented from coming off, the influence of the bending deformation of the resin tube does not easily reach the portion where it is engaged with the main ring body, so that a sufficient retaining action is exhibited and a large connection strength is ensured.

  In the present invention, it is desirable that an inclined surface for increasing the diameter of the main ring body that moves in the resin tube extraction direction following the resin tube and expands the diameter is added to the annular groove portion. According to this, the more the main ring body follows the resin pipe and moves in the extraction direction, the inclined surface projects the engagement of the main ring body in the radially outward direction. As a result, the certainty of the retaining action increases.

  In the present invention, an auxiliary ring body having engagement teeth that are fitted into the annular groove and engage with the inner surface of the tube wall of the resin pipe is added to the locking mechanism, and the auxiliary ring body is connected to the connection It is possible to employ a configuration in which an inclined guide surface is provided that guides the resin tube inserted into the cylindrical portion to the tip of the engaging tooth and then gets over the engaging tooth. According to this, since the square-tooth portion and the auxiliary ring body are engaged with two portions on the inner surface of the tube wall of the resin tube at the distal end portion of the connecting tube portion, the resin tube is particularly bent. The influence of the deformation does not easily reach the engaging portion with the main ring body, and the retaining action is more reliably exerted to ensure a large connection strength.

  In the present invention, the seal body is disposed in an annular recess located on the outer peripheral surface of the connection tube portion at a position between the annular groove and the annular groove, and the inner surface of the annular recess and the resin tube It is desirable to employ a configuration in which the seal ring is in close contact with the inner surface of the tube wall in an elastic contact state. According to this, since it is possible to ensure a sufficiently long interval between the seal portion by the seal ring and the tip end portion of the connection cylinder portion, the influence of the bending deformation of the resin pipe does not easily reach the seal portion. This helps to increase the watertight stability of the seal ring.

  In the present invention, the cylindrical cover is preferably a cylindrical and transparent cover main body and a band that is fitted on the cover main body and prevents the cover body from expanding in diameter. The indicator pushed by the resin tube becomes visible through the transparent cover body.

  In the present invention, the indicator made of an annular body is pushed by the end portion of the resin tube inserted into the connecting cylinder portion, so that the indicator of the connecting cylinder portion is from an initial position where the indicator is fitted to the main ring body. The color of the cover body is a color including white and black, and is moved to an operating position where the insertion length of the resin pipe is set to an appropriate value by abutting against a stepped annular surface provided at the base. It is desirable to adopt a configuration in which it is colored in a different color. According to this, since the indicator at the initial position is fitted outside the main ring body, the main ring body protrudes when the resin pipe is inserted into the connecting cylinder portion, and does not interfere with the insertion work of the resin pipe. Therefore, the resin pipe can be inserted smoothly without being obstructed by the main ring body. In addition, since the indicator pushed by the end of the resin tube abuts against the stepped annular surface provided at the base of the connecting tube portion and moves to the operation position where the insertion length of the resin tube is set to an appropriate value, the insertion work is performed. For the user (operator) to perform, the insertion length of the resin tube can be set to an appropriate value simply by inserting the resin tube until the indicator hits the stepped engagement surface, and workability is improved. There are advantages.

  In the present invention, it is desirable that the band is externally fitted to the cover body at a position that covers and hides the indicator at the initial position and exposes the indicator that hits the stepped annular surface. According to this, since the indicator is covered by the belt ring in its initial position and visible through the transparent cover body as described above in the operating position, the resin pipe joint is indispensable before use. Is not noticeable and unsightly, and after connecting the resin pipe, it is possible to easily visually check whether or not the insertion length of the resin pipe is an appropriate value. In addition, in the case of a resin pipe that is pushed into the connecting cylinder by pushing the indicator, the pipe wall pressed radially outward by the main ring body is reinforced by the belt ring so that the diameter of the pipe does not expand and deform. Since the cover body is supported from the outside by the cover main body, it is difficult to cause a situation in which the resin tube expands and the retaining action by the main ring body is impaired. In addition, the belt ring also exerts the effect of suppressing the temperature change of the hot water flowing through the pipe line and the expansion deformation of the resin pipe due to heat conduction. The situation in which the retaining action by the main ring body is impaired is unlikely to occur.

  In the present invention, it is desirable that the cover main body is coupled to the joint main body and extends to the tip end portion of the connecting tube portion so that the tip end portion reaches a position covering the annular groove. According to this, the certainty of the retaining action of the resin tube at the distal end portion of the connecting cylinder portion is improved by the cover body extending to the distal end portion.

  In the present invention, in the main ring body, the outer diameter of the engaging teeth in the natural state is larger than the inner diameter of the resin tube, and the resin tube inserted into the connecting tube portion is externally fitted to the main ring body. Inclined to reduce the diameter and allow the resin tube to pass therethrough, and to guide the engagement tube to the tip of the engagement tooth while reducing the diameter of the resin tube inserted into the connecting tube portion. It is desirable to have a guide surface. According to this, although the resin tube can be inserted without difficulty, high retaining performance can be obtained.

  In the present invention, the main ring body has a circular portion at one place in the circumferential direction, and the diameter of the main ring body can be easily reduced at a plurality of places spaced from the inner circumference of the main ring body. It is desirable that a notch is formed. According to this, the diameter of the main ring body is easily reduced by notches formed at a plurality of locations on the inner periphery of the main ring body, and the workability of inserting the resin pipe is improved.

  In the present invention, the main ring body may have a composite structure including a cylindrical portion made of resin, and the engagement teeth made of metal overlapping the outside of the cylindrical portion. If the body has such a composite structure, since the metal engagement is harder than the resin tube, the engagement of the engagement with the tube wall of the resin tube is improved and the retaining performance by the main ring body is improved. To do.

As described above, according to the joint for resin pipes according to the present invention, since the indicator at the initial position is fitted outside the main ring body, the main ring body protrudes and is inserted when the resin pipe is inserted into the connecting cylinder portion. There will never be a situation where the tube cannot be plugged in. Therefore, the insertion operation of the resin pipe can be performed smoothly without being obstructed by the main ring body, and the effect of greatly improving the connection workability of the resin pipe with respect to the connection cylinder portion is exhibited.
In addition, the action of indicating the position of the end of the resin tube by the indicator, and even when the resin tube inserted into the connecting cylinder part is bent and deformed at the tip of the connecting cylinder part, it is high due to the action of the locking mechanism. Detachability is exhibited and sufficiently high connection strength is obtained. In addition, by adopting a configuration in which the locking mechanism engages with the inner surface of the tube wall of the resin tube, it is easy to reduce the size, and the number of necessary parts can be reduced to facilitate cost reduction. Played.

  FIG. 1 is a half-cut side view showing a usage state of a resin pipe joint according to an embodiment of the present invention, and FIG. 2 is a half-cut sectional view showing a usage state of a modification of the resin pipe joint.

  In FIG. 1, a joint for resin pipe (hereinafter referred to as “joint”) A is integrally provided with a cylindrical connecting tube portion 10 in a joint body 1 manufactured by cutting, and a polyethylene pipe is connected to the connecting tube portion 10. A resin tube 100 such as is inserted. And, in addition to the resin tube 100 inserted into the connecting tube portion 10 being secured by the locking mechanism 20 described later at two locations of the axial center portion of the connecting tube portion 10 and the tip portion thereof, A cylindrical cover 40 that assists the retaining action by the two locking mechanisms 20 is fitted to the outside of the resin tube 100, and a sealing body 50 is interposed between the connecting tube portion 10 and the resin tube 100. In addition, watertightness is imparted between the above-mentioned portions at the place where the seal body 50 is installed. Further, a stepped annular surface 11 is provided at the base of the connecting tube portion 10, and an indicator 60 that is a ring is formed between the stepped annular surface 11 and the end surface 110 of the resin pipe 100 inserted into the connecting tube portion 10. Is sandwiched. The joint body 1 has a concentric connection port 13 in which the connecting tube portion 10 projects on one side with the tool engaging portion 12 in between and a pipe member such as another joint or piping is connected on the other side. Of course, the shape or configuration of the connection port 13 is not limited to the illustrated example.

  In this joint A, since the locking mechanism 20 employs a configuration that can engage with the inner surface 101 of the resin wall 100 of the resin pipe 100, the locking mechanism 20 needs to be disposed outside the resin pipe 100. As a result, the joint A is easily reduced in size. Next, a detailed configuration of the locking mechanism 20 will be described with reference to FIGS. 1, 3 to 5, and 6 to 9.

  3 is an enlarged partial vertical side view of the main part of FIG. 1, and FIGS. 4 and 5 are partial vertical side views for explaining the operation of the locking mechanism 20 shown in FIG. Shows a main ring body 25 which is an element of the locking mechanism 20.

  As shown in FIG. 1, the locking mechanism 20 is provided at two locations, that is, the central portion in the axial direction of the connecting tube portion 10 and the tip portion thereof, and the locking mechanism 20 at the tip portion of the connecting tube portion 10 is connected. Whereas the locking mechanism 20 at the central portion in the axial direction of the connecting tube portion 10 is formed only by performing a certain processing on the tube portion 10, It is comprised by the main ring body 25 arrange | positioned at the process location.

  Of the two locking mechanisms 20, the locking mechanism 20 provided at the distal end portion of the connecting tube portion 10 is arranged in the axial direction at two locations of the leading end portion of the connecting tube portion 10 as shown in FIG. 3. Is formed by a corner on the front side in the insertion direction of the resin pipe 100 in each annular convex portion 21. In other words, the annular convex portion 21 is formed by forming the annular groove 14 in the vicinity of the tip of the connecting cylinder portion 10, and the corner of the annular convex portion 21 is squared without performing chamfering or the like. The square teeth 22 that can be engaged with the inner surface 101 of the tube wall of the resin pipe 100 are formed by the corners having the square shape remaining as they are. On the other hand, by applying chamfering processing (which may be chamfering or round chamfering (rounding)) to the corners 23 on the rear side in the insertion direction of the resin pipe 100 in each annular convex portion 21, The resin tube 100 can be smoothly inserted into the connecting tube portion 10 even in a light press-fitted state. In the illustrated example, the annular convex portions 21 having the angular tooth portions 22 are formed at two positions aligned in the axial direction of the distal end portion of the connecting cylinder portion 10, but this point is the annular shape having the angular tooth portions 22. The convex portion 21 may be formed only at one position of the distal end portion of the connecting cylinder portion 10.

  On the other hand, the locking mechanism 20 at the central portion in the axial direction of the connecting tube portion 10 is formed in the wide annular groove 26 provided on the outer peripheral surface of the connecting tube portion 10 as shown in FIG. The illustrated main ring body 25 is configured to be slidable in the axial direction.

  The main ring body 25 shown in FIG. 6 is a metal ring having a notch portion at one circumferential direction as shown in FIG. 6A, and the inner peripheral surface thereof is the tapered groove bottom surface of the annular groove portion 26. Is formed as a tapered sliding surface 27 slidably superimposed on the inclined surface 29, and a serrated engagement tooth 28 is provided on the outer peripheral side thereof. Further, as shown in FIGS. 7A and 7B, the main ring body 25 shown in FIG. 7 is reduced in diameter to the configuration of the main ring body 25 shown in FIG. This corresponds to the addition of a V-shaped notch 31 for facilitating the operation, and in the illustrated example, the notch 31 is located at a plurality of locations (such as 5 locations) spaced apart from the inner circumference of the main ring body 25. .

  Although the main ring body 25 shown in FIGS. 6 and 7 is entirely made of metal, this is a composite structure of metal and resin as in the main ring body 25 of FIGS. 8 and 9. It is also possible. That is, the main ring body 25 shown in FIG. 8A is integrally formed by superposing a resin-made cylindrical portion 32 and a serrated metal engagement tooth 28 on the outside of the cylindrical portion 32. . Further, the main ring body 25 shown in FIG. 8 (B) has a cylindrical portion 32 made of resin and a metal engagement tooth 28 and a resin engagement tooth 28 outside the cylindrical portion 32 in a sawtooth shape. In addition, the metal engaging teeth 28 are overlapped and integrated on the outside of the cylindrical portion 32, and the resin engaging teeth 28 are integrally formed on the cylindrical portion 32. By the way, in the main ring body 25 having the composite structure shown in FIGS. 8A and 8B, the metal engagement teeth 28 are formed in a ring shape as shown in FIG. 9B, the metal engaging teeth 28a may be partially inserted by being fitted into the notch portions of the resin engaging teeth 28b as shown in FIG. 9B. 8A and 8B show a state in which the main ring body 25 is reduced in diameter in the direction indicated by the arrow P.

  The main ring body 25 shown in FIGS. 6 to 9 can be deformed in the expansion / contraction diameter direction by the elasticity imparted to the main ring body 25. And in the state which accommodated the main ring body 25 in the annular groove part 26 of the connection cylinder part 10 like FIG. 1, the outer diameter (outer diameter in a natural state) of the engaging tooth 28 when the resin pipe 100 is not inserted ) Is slightly larger than the outer diameter of the connecting tube portion 10. An inclined guide surface 33 is provided on the engaging tooth 28 of the main ring body 25 and guides the resin tube 100 inserted into the connecting tube portion 10 to the tip of the engaging tooth 28 while reducing its diameter, and then gets over the engaging tooth 28. Is equipped.

  As shown in FIG. 1, the sealing body 50 has an outer peripheral surface of the connecting cylinder part 10 at a position between the annular groove part 26 and the annular groove 14 formed at a certain interval in the connecting cylinder part 10. It is comprised by the seal ring which consists of rubber-made O-rings arrange | positioned by the annular recessed part 15 currently formed in this. When the resin tube 100 is inserted into the connecting tube portion 10, the seal ring is brought into close contact with the inner surface of the annular recess 15 and the tube wall inner surface 101 of the resin tube 100 in a resilient contact state, thereby imparting water tightness to the contact portion. To do.

  As shown in FIG. 1, the cylindrical cover 40 is attached to the joint body 1 by screwing a female screw 41 at the tip thereof into the male screw 16 on the joint body 1 side, and is held concentrically with the connecting cylinder portion 10. Yes. The cylindrical indicator 60 slidably fitted into the connecting cylinder 10 is provided in a gap formed between the cylindrical cover 40 and the connecting cylinder 10.

  FIG. 10 is a partially longitudinal side view of the joint A in an initial state where the resin pipe 100 is not inserted, and FIG. 11 is a joint in a state where the end of the resin pipe 100 inserted into the connecting cylinder portion 10 hits the indicator 60. FIG. 12 is a partially longitudinal side view of the joint A in a state where the resin pipe 100 is properly connected to the joint A. FIG.

  The indicator 60 has an inner diameter that is determined to be substantially equal to the outer diameter of the connecting tube portion 10, and the connecting tube portion 10 and the cylindrical cover 40 in a state where the connecting tube portion 10 does not have a large rattling. And is slidably fitted between the gaps. Further, the indicator 60 is covered from the outside by the cylindrical cover 40, and when the joint A is in the initial state shown in FIG. 10, it is fitted on the main ring body 25 as shown in FIG. . This position is the initial position of the main ring body 25. Therefore, the indicator 60 at the initial position holds the main ring body 25 so as not to protrude from the connection cylinder portion 10 by slightly reducing the diameter of the main ring body 25 against its elasticity, and the main ring body 25 is connected to the connection cylinder portion 10. And hold in concentric position.

  As shown in FIGS. 10 to 12, in this embodiment, the cylindrical cover 40 includes a cover main body 42 that is made of a cylindrical and transparent resin, and is externally fitted to the cover main body 42 so that the cover main body 42 And a metal belt ring 43 that prevents the diameter expansion deformation. And in addition to the cover main body 42 being couple | bonded with the coupling main body 1 via the male and female screws 41 and 16 mentioned above, the cover main body 42 extends to the front-end | tip part of the connection cylinder part 10, and the front-end | tip part is The position reaches the position covering the annular groove 14. Further, the band 43 is externally fitted to the cover main body 42 at a position that covers and hides the indicator 60 at the initial position as shown in FIG. 10 and exposes the indicator 60 that abuts against the stepped annular surface 11 as shown in FIG. ing.

  When connecting the resin pipe 100 to the joint A having the above configuration, an operation of inserting the resin pipe 100 into the connection tube portion 10 of the joint A in the initial state is performed. The space between the connecting cylinder portion 10 and the cylindrical cover 40 is determined to be approximately equal to the thickness of the tube wall of the resin tube 100.

When the resin tube 100 is opposed to the joint A as shown in FIG. 10 and then inserted into the connecting tube portion 10 as shown in FIG. 11, the end of the resin tube 100 is an indicator of the initial position at the initial stage of the work. It hits 60. At this time, the indicator 60 is externally fitted to the main ring body 25 to reduce the diameter of the main ring body 25 and hold it so as not to protrude from the connecting tube portion 10, so that the end of the resin tube 100 is the main ring. A situation in which the resin tube 100 cannot be inserted into the connecting tube portion 10 by hitting the body 25 does not occur.

As shown in FIG. 11, after the end of the resin tube 100 hits the indicator 60 at the initial position, when the resin tube 100 is further pushed in, both inner surfaces of the inner surface of the indicator 60 and the tube wall inner surface 101 at the end of the resin tube 100 are obtained. As a result, the diameter of the main ring body 25 is reduced, and when the resin tube 100 is further pushed in, the tube wall inner surface 101 at the end of the resin tube 100 is removed from the indicator 60 in the main ring body 25. The state where the diameter of the main ring body 25 is reduced is maintained, and the resin pipe 100 is smoothly pushed into the connecting cylinder portion 10 in a state where the diameter of the main ring body 25 is reduced by the tube wall inner surface 101 of the resin pipe 100.
Then, as shown in FIG. 12, the insertion length of the resin pipe 100 is determined when the indicator 60 pushed by the resin pipe 100 abuts against the stepped annular surface 11 of the joint body 1. This position is the operating position of the indicator 60.

  Accordingly, only the length of the indicator 60 and the position of the stepped annular surface 11 are determined so that the insertion length of the resin pipe 100 becomes an appropriate value when the indicator 60 hits the stepped annular surface 11 of the joint body 1. Thus, the operator can easily determine an appropriate insertion length of the resin tube 100 only by inserting the resin tube 100 into the connecting tube portion 10 until the resin tube 100 cannot be pushed. In this embodiment, the indicator 60 is pushed out from its initial position so that it escapes from the cover-and-hide position by the belt ring 43. Moreover, since the cover main body 42 is transparent, In addition to the convenience that the operator can visually check the position of the indicator 60 each time, the operator or the like confirms that the indicator 60 is in contact with the stepped annular surface 11 after the resin pipe 100 is connected. There is a convenience that it is possible to confirm that the resin pipe 100 is properly connected by visual inspection. Here, when the indicator 60 is colored, the position of the indicator 60 when viewed with eyes is conspicuous, so that the convenience is improved. In addition, when coloring the indicator 60, the coloring for exhibiting the above convenience may be white, black, chromatic colors such as green and blue, but a transparent cover main body. It is desirable that the color be different from 42 colors.

  In this embodiment, since the corner 23 of the annular convex portion 21 is chamfered as described with reference to FIG. 3 and the like when the resin tube 100 starts to be inserted into the connecting tube portion 10 of the joint A, the resin tube 100 is smoothly inserted without being caught by the annular convex portion 21. Further, when the resin tube 100 is bent after being inserted into the connecting tube portion 10 or in the middle of being inserted, as shown in FIG. 4 or FIG. 5, the angular teeth of the annular convex portion 21 regardless of the bending direction. Since the portion 22 engages with the tube wall inner surface 101 of the resin tube 100 and prevents the resin tube 100 from moving in the extraction direction, the influence of the bending deformation of the resin tube 100 is affected by the main ring body 25. It is difficult to reach the meshing part and the close contact part of the seal body 50. Therefore, there is an advantage that the retaining action by the main ring body 25 and the water tightness imparting action by the seal body 50 are hardly damaged by the bending deformation of the resin pipe 100.

  FIG. 13 is a longitudinal side view of the main part showing a state where the resin tube 100 is inserted into the connecting tube part 10, and FIG. 14 is a drawing of the resin tube 100 inserted into the connecting tube part 10 in the pulling-out direction. It is the vertical side view of the principal part which showed the state of time.

  As shown in FIG. 13, when the resin tube 100 inserted into the connecting tube portion 10 is not pulled in the pulling-out direction, the engaging teeth 28 are applied to the tube wall inner surface 101 of the resin tube 100 by the elastic restoring force of the main ring body 25. The engaging teeth 28 are engaged with the inner surface 101 of the resin tube 100 by the elastic restoring force. Therefore, when the resin tube 100 inserted into the connecting tube portion 10 is pulled in the extraction direction as shown in FIG. 14, the main ring body 25 rides on the inclined surface 29 of the annular groove portion 26 together with the resin tube 100, and the engagement teeth 28 thereof. Bites into the tube wall inner surface 101 of the resin tube 100 to increase the engagement force. For this reason, the retaining action by the main ring body 25 increases as the resin tube 100 is pulled in the pulling direction. In this embodiment, the position of the indicator 60 fitted to the main ring body 25 is determined as the initial position of the indicator 60, and the band 43 of the cylindrical cover 40 is positioned so as to cover the indicator 60 at the initial position. 13 and 14, when the main ring body 25 elastically presses the tube wall inner surface 101 of the resin tube 100 as shown in FIGS. 13 and 14, the resin tube 100 and the cover main body 42 are externally moved by the elastic action. The occurrence of the situation of bulging out is prevented by the band 43. Therefore, depending on the cover body 43 alone, the resin tube 100 and the cover body 43 are warmed and softened by hot water flowing through the pipeline, for example, in an environment where the action of preventing the expansion of the resin tube 100 is uncertain. Even under the environment, since the swollen diameter of the cover main body 43 is reliably prevented by the belt ring 43, the provision of the belt ring 43 helps to prevent the main ring body 25 from lowering the retaining action. .

  Next, the joint A shown in FIG. 2 is different from that shown in FIG. 1 in that the connecting tube portion 10 of the joint body 1 is formed of a thin tube. Further, this joint A is different from that shown in FIG. 1 in that the bottom surface of the annular groove 26 is not an inclined surface 29 (see FIG. 1). The other configuration is the same as that of FIG. 1 and the operation is also the same. Therefore, in order to avoid duplication of explanation, the same reference numerals as those shown in FIG. The detailed explanation is omitted.

  FIG. 15 shows another embodiment. In this embodiment, the point which accommodated the auxiliary | assistant ring body 34 which has an engagement in the annular groove 14 of the connection cylinder part 10 is different from the thing of FIG. Other items and actions are the same as those in FIG. The auxiliary ring body 34 has an inclined guide surface (the inclined guide shown in FIGS. 6, 7 and 8) that guides the resin tube 100 inserted into the connecting cylinder portion 10 to the tip of the engaging tooth and then gets over the engaging tooth. Corresponding to the surface 33). According to this embodiment, since both the square tooth portion 22 and the engaging ring of the auxiliary ring body 34 are engaged with the tube wall inner surface 101 of the resin tube 100, the resin tube 100 has a retaining action. It is even more prominent.

It is the half-cut side view which showed the use condition of the joint for resin pipes concerning embodiment of this invention. It is the half-cut sectional view which showed the use condition of the modification of the joint for resin pipes. It is the partial longitudinal cross-sectional side view which expanded the principal part of FIG. FIG. 4 is a partially longitudinal side view for explaining the operation of the locking mechanism shown in FIG. 3. FIG. 4 is a partially longitudinal side view for explaining the operation of the locking mechanism shown in FIG. 3. (A) is a front view of a main ring body, (B) is an expanded sectional view of the part which follows the VIB-VIB line of (A). (A) is a front view of the main ring body by a modification, (B) is an expanded sectional view of the part which follows the VIIB-VIIB line of (A). (A) is a front view of the main ring body by another modification, (B) is a front view of the main ring body by another modification. (A) is an expanded sectional view of the part which follows the IXA-IXA line | wire of FIG. 8 (A), (B) is an expanded sectional view of the part which follows the IXB-IXB line | wire of FIG. 8 (B). It is a partial vertical side view of the joint in an initial state. It is a partial vertical side view of a joint in the state where the end of the resin pipe hits the indicator. It is a partial vertical side view of a joint in which a resin pipe is connected to the joint. It is the vertical side view of the principal part which showed the state when the resin pipe | tube is inserted in the connection cylinder part. It is the vertical side view of the principal part which showed the state when the resin pipe inserted in the connection cylinder part was pulled by the extraction direction. It is a half-cut side view of the principal part in the use condition of other embodiment.

A Resin pipe joint 1 Joint body 10 Connection tube 11 Stepped annular surface 14 Annular groove 15 Annular recess 20 Locking mechanism 21 Annular convex 22 Angular tooth 25 Main ring body 26 Annular groove 28 Engagement 29 Inclined surface 31 Notch 32 Cylindrical part 33 Inclined guide surface 34 Auxiliary ring body 40 Cylindrical cover 42 Cover main body 43 Band 50 Sealing body 60 Indicator 100 Resin pipe 101 Inner wall surface of resin pipe

Claims (12)

A joint body provided with a connecting cylinder part into which a resin pipe is inserted;
A locking mechanism that engages with the inner surface of the tube wall of the resin tube inserted into the connection tube portion at at least two positions, that is, the axial center portion of the connection tube portion and the tip end portion thereof, and prevents the resin tube from being removed. ,
A sealing body that is in close contact with the outer peripheral surface of the connection tube portion and the tube wall inner surface of the resin tube inserted into the connection tube portion, and imparts water tightness to those contact portions;
An indicator formed of an annular body that indicates the position of the end of the resin tube by being pushed by the end of the resin tube that is fitted into the connection tube and inserted into the connection tube;
A cylindrical cover that covers this indicator from the outside and is fitted to the outside of the resin tube inserted into the connecting tube portion to prevent the resin tube from expanding and to assist the retaining action by the locking mechanism; Prepared ,
The locking mechanism is axially slidably arranged in an annular groove located on the outer peripheral surface of the connecting tube portion in the axial direction, and is elastically deformable in the expansion / contraction diameter direction, and the wall of the resin pipe The main ring body for retaining has an engaging tooth engaged with the inner surface, and the main ring body has an outer diameter of the engaging tooth in a natural state larger than an inner diameter of the resin tube, and the connecting cylinder The resin pipe inserted into the part is configured to reduce the diameter by externally fitting to the main ring body and pass the resin pipe,
The indicator made of annulus is formed so that the inner diameter thereof is substantially the same as the outer diameter of the connecting cylinder part, and the main ring body is reduced in diameter against its elasticity so as not to protrude from the outer peripheral surface of the connecting cylinder part. Hold the main ring body in a concentric position with the connecting cylinder part, and slidable between the gaps between the connecting cylinder part and the cylindrical cover. A joint for resin pipes characterized by being combined . In the insertion direction of the resin pipe in the annular convex portion provided at least at one axial direction of the distal end portion of the connecting cylinder portion by forming an annular groove in the main ring body and the connecting cylinder portion. A corner toothed portion that is a front corner and engages with the inner surface of the tube wall of the resin tube, and the corner on the rear side in the insertion direction of the resin tube in the annular convex portion is chamfered. The resin pipe joint according to claim 1. The resin according to claim 1 or 2, wherein an inclined surface for increasing the diameter of the main ring body that moves following the resin pipe and moves in the direction of extracting the resin pipe is added to the annular groove. Pipe fittings.   An auxiliary ring body having engagement teeth that are fitted in the annular groove and engage with the inner surface of the tube wall of the resin pipe is added to the locking mechanism, and the auxiliary ring body is inserted into the connection cylinder portion. The resin pipe joint according to claim 2 or 3, further comprising an inclined guide surface that guides the resin pipe to the tip of the engaging tooth and then climbs over the engaging tooth.   The seal body is disposed in an annular recess located on the outer peripheral surface of the connecting tube portion at a position between the annular groove and the annular groove, and an inner surface of the annular recess and an inner wall surface of the resin pipe The joint for resin pipes of any one of Claims 2 thru | or 4 which consists of a seal ring closely_contact | adhered to an elastic contact state.   6. The cylindrical cover according to any one of claims 1 to 5, wherein the cylindrical cover is a cylindrical and transparent cover main body and a belt ring that is fitted on the cover main body and prevents the cover body from expanding in diameter. The resin pipe joint described. The indicator formed of a ring is boosted by an end of the resin pipe inserted into the connection tube portion from an initial position fitted to the main ring body, and is provided at a base of the connection tube portion. It is designed to move to the operating position where the insertion length of the resin tube is set to an appropriate value by striking the attached annular surface, and is colored in a color different from the color of the cover body, including white and black The joint for resin pipes of any one of Claim 1 thru | or 6 currently performed.   The band according to claim 6 or 7, wherein the belt ring is externally fitted to the cover body at a position covering and concealing the indicator at an initial position and exposing the indicator that has hit the stepped annular surface. Joint for resin pipe.   The cover body is coupled to the joint body, and extends to the tip of the connecting tube portion, and the tip of the cover body reaches a position covering the annular groove. The joint for resin pipes described in 1 above. The main ring body, of claims 1 to 9 is provided with an inclined guide surface causes overcome the Kakariha after guided to the tip of the Kakariha while diameter of the resin pipe to be inserted into the connecting tube portion The joint for resin pipes described in any one item.   The main ring body has a notch portion at one place in the circumferential direction, and there are notches for facilitating the diameter reduction of the main ring body at a plurality of places spaced from the inner circumference of the main ring body. The joint for resin pipes according to claim 10 formed. The said main ring body has any one of Claims 1 thru | or 11 provided with the composite structure provided with the cylindrical part which consists of resin, and the said engaging tooth which consists of the metal overlapped on the outer side of the cylindrical part. The joint for resin pipes described in 1 above.

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