JP7277741B2 - Fittings for synthetic resin pipes - Google Patents

Description

The present invention relates to a joint for connecting synthetic resin pipes used in hot water supply systems and the like.

2. Description of the Related Art Conventionally, hot water pipes used in hot water supply systems have used metal pipes at high pressure points and synthetic resin pipes at low pressure points depending on the water pressure. Synthetic resin pipes connected to the components of the hot water supply system are adjusted to an appropriate length at the construction site. The joint for synthetic resin pipes for connecting the synthetic resin pipes is configured so that it can be easily connected at the construction site.

In order to maintain a connected state in which the synthetic resin pipe joint does not cause water leakage, the synthetic resin pipe must be inserted to a predetermined insertion position inside the synthetic resin pipe joint. Therefore, the worker marks a predetermined length from the tip of the synthetic resin pipe at the construction site using, for example, a pen or sticker. By inserting the synthetic resin pipe into the joint for synthetic resin pipes up to the marked position, the synthetic resin pipe is inserted to a predetermined insertion position and connected.

In order to reduce the burden on the operator as described above, for example, as in Patent Document 1, the position of the tip of the inserted synthetic resin pipe is configured to be visible through a transparent or translucent synthetic resin member. One-touch joints are known. Since the tip of the inserted synthetic resin pipe can be seen, the operator can confirm that the synthetic resin pipe has been inserted to an appropriate insertion position without marking.

On the other hand, as in Patent Document 2, in gas piping, by using the change in sound and response when a metal corrugated pipe is inserted to a predetermined position, it is possible to detect that the corrugated pipe has been inserted to a predetermined insertion position. Plumbing fittings that notify the operator are known.

JP 2007-198585 A Japanese Patent No. 4375847

However, at a construction site where the space for connecting synthetic resin pipes is narrow, it may be difficult to visually recognize the tip of the synthetic resin pipe inserted into the joint for synthetic resin pipes as in Patent Document 1.

Moreover, it may be difficult to invert the annular disk spring as in Patent Document 2 unless the tip of the synthetic resin pipe contacts and presses the annular disk spring substantially evenly. Therefore, the operator who adjusts the length of the synthetic resin pipe is required to cut the synthetic resin pipe substantially perpendicularly to its axis, which increases the burden. In addition, since the synthetic resin pipe does not have portions corresponding to the peaks and valleys of the corrugated pipe, it is not possible to utilize the changes in sound and response when the peaks or valleys get over the protrusions. It is also not easy for the operator to form corresponding parts on the synthetic resin pipe.

SUMMARY OF THE INVENTION An object of the present invention is to provide a joint for synthetic resin pipes that can inform an operator that a synthetic resin pipe has been inserted to a predetermined insertion position.

The synthetic resin pipe joint of the invention of claim 1 comprises a cylindrical main body, a flange formed at one end of the main body, and a flange attached to the flange and inserted into the main body from the flange side. A joint for a synthetic resin pipe comprising a plurality of locking members for locking synthetic resin pipes that are locked together, and an operating member attached to the flange portion for switching the locking members between a locked state and a released state. , an insertion detection member for detecting insertion of a synthetic resin pipe is accommodated in an inner depth portion of the interior of the main body portion on the inner side in the pipe insertion direction, and the insertion detection member includes a ring portion and a pipe insertion direction depth from the ring portion. It has a claw portion extending toward the side and having a hook-shaped tip portion. The synthetic resin pipe is inserted into a preset insertion position by an impact generated when the pipe is pushed over a stepped portion provided in the pipe.

According to the above configuration, when the synthetic resin pipe is inserted into the joint for synthetic resin pipes, the insertion detection member is pushed by the synthetic resin pipe and moves to the rear side in the pipe insertion direction. The claw portion of the insertion detection member, which moves inward in the pipe insertion direction, climbs over a stepped portion provided in the innermost portion of the main body portion of the synthetic resin pipe joint and stops, thereby presetting the synthetic resin pipe. Stop at the insertion position. At this time, the claw portion moves over the stepped portion while being elastically deformed, and when the stepped portion is crossed, the elastic deformation of the claw portion is canceled and an impact is generated. Since this impact is transmitted to the operator through the synthetic resin pipe joint and the synthetic resin pipe, the operator can be notified that the synthetic resin pipe has been inserted into the preset insertion position. Also, the sound generated by this impact can inform the operator that the synthetic resin pipe has been inserted into the preset insertion position. Moreover, even if the synthetic resin pipe is not perpendicular to its axis but is cut with a slight inclination and the tip of the pipe does not evenly abut against the insertion detection member, the insertion detection member can be moved backward in the pipe insertion direction. can reduce the burden on workers.

A joint for synthetic resin pipes according to a second aspect of the invention is characterized in that, in the first aspect of the invention, the stepped portion is formed in an insertion hole for inserting the claw portion formed in the inner deep portion of the main body portion. It is characterized by

According to the above configuration, the insertion hole into which the claw portion is inserted guides the movement of the insertion detection member toward the inner side in the pipe insertion direction while maintaining the posture of the insertion detection member, thereby allowing the synthetic resin pipe to be inserted in a preset manner. It can be inserted into position. Moreover, even if the synthetic resin pipe is not perpendicular to its axis and is cut slightly inclined, and the tip of the pipe does not evenly contact the insertion detection member, the insertion detection member can be guided backward in the pipe insertion direction. Since it can be moved, the burden on the operator is also reduced.

According to the joint for synthetic resin pipes of the present invention, it is possible to notify the operator that the synthetic resin pipe has been inserted to a predetermined insertion position, and to reduce the burden on the operator.

1 is a perspective view of a joint for synthetic resin pipes according to an embodiment of the present invention; FIG. Fig. 2 is an exploded perspective view of a main part of a joint for synthetic resin pipes; 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. FIG. 4 is a cross-sectional view when a synthetic resin pipe is locked to the synthetic resin pipe joint of FIG. 3 ; It is a perspective view of an insertion detection member. It is a figure which shows the inside of an operation member. It is the figure which looked at the cyclic|annular locking member from the guide member side. FIG. 4 is an explanatory diagram of a restricting portion of the main body; FIG. 4 is an explanatory diagram of an engaging portion of an operating member; It is a figure which shows the state which the engaging part engaged with the control part.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

Synthetic resin pipes (for example, polyethylene pipes and polybutene pipes) connected to equipment constituting a hot water supply system are connected to synthetic resin pipe joints 1 arranged at the ends of the internal pipes of the equipment at the construction site. As shown in FIGS. 1 to 4, the synthetic resin pipe joint 1 includes, for example, a cylindrical main body 2 fixed to the end of the internal pipe U, and one end of the main body 2 (on the opposite side of the internal pipe U). and an operation member 10 mounted coaxially with the axis C of the main body 2 so as to fit onto the flange 3 . The synthetic resin pipe T is inserted into the body portion 2 from the flange portion 3 side through the operation member 10 along the axis C. As shown in FIG.

The portion of the main body 2 into which the synthetic resin pipe T is inserted consists of a large-diameter portion 2a having a larger inner diameter on the flange portion 3 side and a small-diameter portion 2b (inner innermost portion) having a smaller inner diameter than the large-diameter portion 2a. ). The small diameter portion 2b communicates with the connection portion 2d of the internal pipe U through a communicating passage 2c having an inner diameter smaller than that of the small diameter portion 2b on the inner side of the small diameter portion 2b in the pipe insertion direction. Inside the main body 2, a cylindrical inner member 4 is incorporated coaxially with the axis C, and an annular insertion detection member 5 and a seal member 6 for detecting the insertion of the synthetic resin pipe T are installed in the inner portion. It is fitted over the member 4 . A guide member 30 , an annular locking member 20 and an operation member 10 are attached to the flange portion 3 .

For example, the inner member 4, the insertion detection member 5, and the seal member 6 are assembled in this order into the body portion 2 in which the axis C is vertical and the flange portion 3 is positioned upward. The inner member 4 to which the insertion detection member 5 and the seal member 6 are attached may be incorporated into the body portion 2 . A guide member 30 is attached to the flange portion 3 of the body portion 2 , and the operation member 10 is attached to the flange portion 3 with the annular locking member 20 placed on the guide member 30 . The synthetic resin pipe joint 1 assembled in this manner is connected to the internal pipe U of the equipment at the hot water supply equipment manufacturing factory or construction site.

An inner flange portion 4a is formed at the end portion of the inner member 4 on the far side in the pipe insertion direction. The inner flange portion 4a is accommodated so as to be fitted onto the small diameter portion 2b of the main body portion 2 and in contact with the rear side wall portion of the small diameter portion 2b in the tube insertion direction. The opposite end portion extends outside the flange portion 3 in the direction of the axis C. As shown in FIG.

The seal member 6 is accommodated so as to be spaced apart from the inner member 4 and fitted over the large-diameter portion 2 a of the body portion 2 . The seal member 6 has a plurality of backup rings 6a and a plurality of seal rings 6b arranged alternately in accordance with the length of the large diameter portion 2a in the direction of the axis C, and the seal ring 6b is sandwiched between the backup rings 6a. is formed as

The insertion detection member 5 is accommodated in the small diameter portion 2b between the inner flange portion 4a and the seal member 6. As shown in FIG. As shown in FIGS. 2 and 5, the insertion detection member 5 includes a ring portion 5a and a plurality of claw portions 5b extending from the ring portion 5a toward the inner side in the pipe insertion direction and having hooked ends. have. The tip portion of the claw portion 5b protrudes radially outward, and this protruding portion is inclined or rounded so that the amount of protrusion decreases toward the inner side in the pipe insertion direction. In this embodiment, the tip portion is provided with three claw portions 5b protruding radially outward and forming a hook shape, but the number of claw portions is not limited to this, and the projection direction of the tip portion is is not limited to this.

As shown in FIG. 3, the distal end portion of the claw portion 5b is provided on the inner flange portion 4a so as to correspond to the claw portion 5b when the ring portion 5a is in contact with or close to the seal member 6. It is inserted into the hole 4b, and rotation of the insertion detection member 5 in the circumferential direction is restricted. A stepped portion 4c is formed in the insertion hole 4b on the side from which the tip portion of the claw portion 5b protrudes, and restricts the tip portion of the claw portion 5b from entering the back side. Here, the stepped portion 4c is formed so as to be closer to the axis C as it goes deeper in the pipe insertion direction, and the far side end portion is formed so as to rapidly move away from the axis C, but this is not limitative. isn't it.

As shown in FIGS. 2 and 6, the operation member 10 is formed in a bottomed cylindrical shape having a cylindrical wall portion 11 and a bottom wall portion 12, and a plurality of non-slip grooves are provided on the outer circumference of the cylindrical wall portion 11. ing. An opening 13 for inserting the synthetic resin pipe T is provided in the center of the bottom wall portion 12 . A pair of engaging claws 14 for engaging with the flange portion 3 are formed on the inner wall of the end portion of the cylindrical wall portion 11 opposite to the bottom wall portion 12 so as to face each other. The bottom wall portion 12 has ribs for ensuring strength enough to withstand the stress during the pivoting operation around the axis C, but the bottom wall portion 12 may be formed thick.

As shown in FIGS. 2, 4, and 7, in order to lock the synthetic resin tube T inserted into the body portion 2 from the flange portion 3 side through the opening 13 of the operation member 10, a shaft center C is provided. An annular locking member 20 is arranged between the flange portion 3 and the bottom wall portion 12 of the operating member 10 . The annular locking member 20 is formed in an annular shape by arranging, for example, two locking members 21 having the same length in the circumferential direction. Note that the annular locking member 20 may be composed of three or more locking members.

The locking member 21 includes a metal thin plate member 22 having a plurality of engaging teeth 22a formed so as to bite into the synthetic resin pipe T on the inner periphery facing the inserted synthetic resin pipe T; is configured by a support member 23 made of synthetic resin, for example, for supporting the . By moving the plurality of locking members 21 toward and away from each other in the radial direction, a locked state in which the inserted synthetic resin pipe T is locked so as not to come off, and a locked state in which the synthetic resin pipe T is not locked. Toggle release state.

The synthetic resin pipe joint 1 is provided with projections provided on either the inner wall of the bottom wall portion 12 of the operating member 10 or the facing surface portions of the plurality of locking members 21 facing the bottom wall portion 12 on the other side. It has a cam mechanism engaged with the circular hole groove. For example, the two locking members 21 each have a columnar protrusion 24 protruding toward the bottom wall 12 at a central position in the circumferential direction on the outer peripheral side of the facing surface facing the bottom wall 12 . As shown in FIG. 6, two arcuate circular grooves 15 are formed in the inner wall of the bottom wall portion 12 of the operating member 10 so as to correspond to the projections 24, the same number as the locking members 21. there is

The circular hole groove 15 is a protruding portion such that the distance from the axis C (the distance from the center of the bottom wall portion 12 through which the axis C passes) decreases as it progresses clockwise when viewed from the locking member 21 side. 24 is formed to have a length corresponding to the rotation angle (for example, 70 degrees) of the operation member 10 corresponding to the rotation operation for switching between the locked state and the unlocked state.

The cam mechanism formed by engagement between the protrusion 24 and the circular hole groove 15 is such that when the operation member 10 is rotated, the protrusion 24 slides along the circular hole groove 15 and the locking member 21 moves radially. As it moves, the rotation of the operating member 10 is converted into radial movement of the locking member 21 . When viewed from the side where the synthetic resin tube T is inserted, clockwise rotation of the operating member 10 about the axis C is the locking operation, and counterclockwise rotation is the unlocking operation. This is an operation to cancel the state.

Between the flange portion 3 and the plurality of locking members 21, guide projections provided on one of the flange portion 3 and the locking members 21 are engaged with radially extending guide grooves provided on the other. A guide mechanism is provided for each. This guide mechanism guides the movement of the locking member 21 in the radial direction by causing the guide protrusion engaged with the guide groove to slide along the guide groove, and regulates the movement of the locking member 21 in directions other than the radial direction. .

For example, as shown in FIG. 2, the supporting member 23 of the locking member 21 is formed with a radially extending guide projection 23a projecting toward the flange portion 3. A guide member 30 (guide portion) in which the same number of radially extending guide grooves 30a as the plurality of locking members 21 are formed is mounted. The guide member 30 is formed with a plurality of regulation grooves 30b extending parallel to the guide grooves 30a and shorter than the guide grooves 30a. These restricting grooves 30b are spaced apart in a direction orthogonal to the radial direction in which the guide grooves 30a extend so as to form a pair with the guide grooves 30a interposed therebetween for each guide groove 30a. As shown in FIG. 7, a pair of cylindrical restricting projections 23b, 23b are formed on the supporting member 23 so as to correspond to the restricting grooves 30b.

The engagement between the regulating groove 30b and the regulating projection 23b determines the radial movement range of the locking member 21 and regulates the radial movement of the locking member. Suppress the swing of 21. In order to suppress this rocking motion, it is preferable that the regulation groove 30b and the regulation projection 23b are separated from the guide groove 30a and the guide projection 23a, respectively.

Although illustration is omitted, the guide mechanism may be configured by omitting the guide member 30 and forming a guide groove or the like in the flange portion 3 . Also, although not shown, guide grooves or the like are formed in each locking member 21, and guide projections or the like corresponding to the guide grooves or the like are formed in the flange portion 3 or in the guide member 30 attached to the flange portion 3. You may constitute a guide mechanism.

As shown in FIGS. 2 and 7, the annular locking member 20 has a pair of notches 20b, the flange portion 3 has a pair of notches 3b, and the guide member 30 has a pair of notches 30c. It has on the outer periphery. The notches 20b, 3b, and 30c are aligned in the circumferential direction so that the operating member 10 does not interfere with the pair of engaging claws 14 when the operating member 10 is attached to the flange portion 3. These notches may be omitted if the operation member 10 can be elastically deformed and attached to the flange portion 3 .

As shown in FIGS. 2 and 8, on the outer peripheral portion of the body portion 2, there is provided an engaging portion protruding radially outward as a restricting portion 7 for restricting the rotation of the operating member 10 in order to maintain the locked state. A projection 7a and an engaging projection 7b are provided close to each other. The engaging protrusion 7a has a substantially constant width in the direction of the axis C, the center portion in the circumferential direction protrudes most, and both sides thereof are inclined to trail off. The engaging projection 7b protrudes larger than the engaging projection 7a, and includes a parallel surface portion 7c parallel or substantially parallel to a plane including the axis C and passing through the center of the engaging projection 7a, and a flange portion closer to the parallel surface portion 7c. It has a slope portion 7d on the side of the flange portion 3 that slopes toward the 3 side.

As shown in FIGS. 2 and 9, the operating member 10 has an engaging portion 17 extending in a direction parallel to the axis C from the end of the cylindrical wall portion 11 opposite to the bottom wall portion 12 . An engaging groove 17a (radial engaging portion) formed so as to extend in a direction parallel to the axis C is provided on the inner peripheral side of the engaging portion 17 . With the operating member 10 attached to the flange portion 3, the engagement groove 17a can be engaged with the engagement protrusion 7a by utilizing the elastic deformation of the engagement portion 17 in the radial direction.

The engaging portion 17 has a notch portion 17c formed between the tip portion 17b and the cylindrical wall portion 11 in the direction of rotation of the releasing operation. It has an engagement end portion 17d (circumferential direction engagement portion) parallel to the center C. A distal end portion 17b of the engaging portion 17 is inclined so as to be closer to the cylindrical wall portion 11 (the base end portion of the engaging portion 17) as the distance from the engaging end portion 17d increases. With the operating member 10 attached to the flange portion 3, the engaging end portion 17d of the engaging portion 17 and the parallel surface portion 7c of the engaging projection 7b can be engaged.

When the operating member 10 is rotated to bring it into the locked state, the tip 17b of the engaging portion 17 abuts against the slope portion 7d of the engaging projection 7b, and the engaging portion 17 contacts the cylindrical wall portion 11 (engaging portion). A force is received in the direction toward the proximal end of the joining portion 17). By this force, the engagement portion 17 is elastically deformed in the direction of the axis C so that the notch portion 17c becomes narrower, and the engagement portion 17 is rotated until it passes over the engagement projection 7b. When the engaging portion 17 passes over the engaging projection 7b, the elastic deformation is eliminated, and as shown in FIG. do. At this time, the engaging groove 17a also engages with the engaging projection 7a.

Due to the engagement between the engaging projections 7a and 7b of the restricting portion 7 and the engaging portion 17, it becomes difficult for the operating member 10 to rotate in the rotating direction of the unlocking operation from the locked state. The locked state is maintained by restricting accidental rotation in this direction by On the other hand, when the operator performs a releasing operation while releasing the engagement by elastically deforming the engaging portion 17, or performs a releasing operation with a relatively strong force from the locked state, the elastic deformation of the engaging portion 17 and the restricting portion may occur. Since the engagement in the circumferential and radial directions is released by the slippage between 7 and engaging portion 17, the released state can be easily achieved.

Next, the connection work of the synthetic resin pipe T will be described.
Before the synthetic resin pipe T is inserted, the insertion detection member 5 is accommodated in the small diameter portion 2b (inner depth portion) inside the body portion 2 on the inner depth side in the pipe insertion direction, as shown in FIG. The ring portion 5a of the insertion detection member 5 is in contact with or close to the seal member 6 (backup ring 6a), and the tip portion of the claw portion 5b is formed so as to extend to the back side in the tube insertion direction at the inner back portion. It is inserted into the hole 4b.

As shown in FIG. 4, the synthetic resin pipe T is inserted into the joint 1 for synthetic resin pipes from the opening of the operating member 10, and the synthetic resin pipe T is inserted between the outer peripheral portion of the inner member 4 and the inner peripheral portion of the seal member 6. Tube T enters. As the synthetic resin tube T is inserted, the tip of the synthetic resin tube T comes into contact with the ring portion 5a of the insertion detection member 5 and presses it backward in the tube insertion direction, and the insertion detection member 5 moves backward in the tube insertion direction. do.

At this time, when the tip portion of the claw portion 5b advances along the slope of the stepped portion 4c provided in the insertion hole 4b toward the inner side in the pipe insertion direction, the claw portion 5b is elastically deformed, and when it climbs over the stepped portion 4c. The elastic deformation of the claw portion 5b is released, and the tip of the claw portion 5b collides with the wall portion of the insertion hole 4b. The impact of this collision is transmitted to the operator from the synthetic resin pipe T and the joint 1 for synthetic resin pipes, and informs the operator that the synthetic resin pipe T has been inserted into the insertion position set at an appropriate position in advance. A sound generated at the time of collision also informs that the synthetic resin tube T has been inserted into its proper insertion position.

The position where the claw portion 5b goes over the stepped portion 4c is the insertion position that is set to an appropriate position in advance. In the state where the synthetic resin tube T is inserted to this position or to a position where the ring portion 5a abuts the inner flange portion 4a on the inner side in the pipe insertion direction, work is performed to achieve the locked state. The operator performs the locking operation of the operating member 10 . By this locking operation, the plurality of locking members 21 move radially toward each other to lock the synthetic resin pipe T, and the engaging portion 17 is engaged with the restricting portion 7 as shown in FIG. to maintain the connected state of the synthetic resin pipe T.

The operator recognizes the locked state from the sound and vibration generated when the engaging portion 17 engages with the engaging protrusions 7 a and 7 b of the restricting portion 7 by performing the locking operation. Also, the operator recognizes the locked state by seeing the state in which the engaging protrusions 7a and 7b and the engaging portion 17 are engaged.

The operation and effects of the synthetic resin pipe joint 1 according to the embodiment will be described.
When the synthetic resin pipe T is inserted into the joint 1 for synthetic resin pipes, the insertion detection member 5 is pushed into the synthetic resin pipe T and moves to the rear side in the pipe insertion direction. Then, the claw portion 5b of the insertion detecting member 5, which moves to the innermost side in the pipe insertion direction, climbs over the step portion 4c provided in the innermost portion of the main body portion 2 of the synthetic resin pipe joint 1, and the insertion detecting member 5 stops. , the synthetic resin pipe T stops at the preset insertion position.

At this time, the claw portion 5b moves over the stepped portion 4c while being elastically deformed, and when the claw portion 5b passes over the stepped portion 4c, the elastic deformation of the claw portion 5b is released, thereby generating an impact. Since this impact is transmitted to the operator through the synthetic resin pipe joint 1 and the synthetic resin pipe T, the operator can be notified that the synthetic resin pipe T has been inserted into the preset insertion position. Also, the sound generated by this impact can inform the operator that the synthetic resin pipe T has been inserted into the preset insertion position.

An insertion hole 4b into which the pawl portion 5b is inserted in the inner depth portion of the main body portion 2 guides the movement of the insertion detection member 5 to the depth side in the tube insertion direction while maintaining the posture of the insertion detection member 5, thereby synthesizing. The resin pipe T can be inserted up to a preset insertion position. Moreover, even if the synthetic resin pipe T is not perpendicular to the axis C but is cut at a slight angle and the tip thereof does not evenly abut the ring portion 5a of the insertion detection member 5, the posture of the insertion detection member 5 will not be affected. Since it can be guided and moved to the back side in the pipe insertion direction while maintaining the position, the burden on the operator is also reduced.

In addition, those skilled in the art can implement various modifications to the above embodiment without departing from the spirit of the present invention, and the present invention includes such modifications.

1: Synthetic resin pipe joint 2: Body portion 2a: Large diameter portion 2b: Small diameter portion (inner depth)
3: Flange portion 4: Inner member 4a: Inner flange portion 4b: Insertion hole 4c: Stepped portion 5: Insertion detection member 5a: Ring portion 5b: Claw portion 6: Seal members 7a and 7b: Engagement projection 7c: Parallel surface portion 7d : Inclined portion 10 : Operating member 11 : Cylindrical wall portion 12 : Bottom wall portion 13 : Opening 15 : Circular hole groove 17 : Engaging portion 17a : Engaging groove (radial engaging portion)
17b: tip portion 17c: notch portion 17d: engagement end portion (circumferential direction engagement portion)
20 : Annular Locking Member 21 : Locking Member 22 : Thin Plate Member 23 : Supporting Member 23a : Guide Projection 23b : Regulating Projection 24 : Protruding Portion 30 : Guide Member 30a : Guide Groove 30b : Regulating Groove C : Axis T : Synthetic Resin pipe U: Internal pipe

Claims (2)

A cylindrical main body, a flange formed at one end of the main body, and a plurality of fasteners attached to the flange for locking synthetic resin pipes inserted into the main body from the flange side. and an operating member attached to the flange portion for switching the locking member between a locked state and a released state,
An insertion detection member for detecting insertion of a synthetic resin pipe is accommodated in an inner depth portion on the inner depth side in the pipe insertion direction inside the main body portion,
The insertion detection member has a ring portion and a claw portion extending from the ring portion toward the inner side in the tube insertion direction and having a hook-shaped tip,
When the insertion detection member moves to the back side in the pipe insertion direction as the synthetic resin pipe is inserted, the synthetic resin pipe is preliminarily moved by the impact when the claw portion climbs over the stepped portion provided in the inner back portion. A joint for synthetic resin pipes, characterized in that it is configured to inform an operator that it has been inserted into a set insertion position. 2. The synthetic resin pipe joint according to claim 1, wherein the stepped portion is formed in an insertion hole for inserting the claw portion formed in the inner deep portion of the main body portion.

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