JP5297689B2 - Corrugated fitting - Google Patents

Abstract

The invention relates to a corrugated pipe joint capable of securely connecting a corrugated pipe with a simple operation and capable of keeping a proper air-tight sealing state. In the corrugated pipe joint 1, a cylindrical joint main body 10 having an inner hole 11 into which a corrugated pipe T having annular furrows and ridges on its outer circumference is inserted, an air-tight packing 31, arranged in a joint main body inner hole, for tightly contacting with an outer circumferential surface of the corrugated pipe, a retainer 40, arranged in a joint main body inner hole, having a claw 43, of which diameter is enlargeable and contractable, engaging with an annular furrow part of the corrugated pipe when its diameter is contracted and a retainer pressing sleeve 50 for sliding in a rear direction and pressing the retainer to contract so that the claw of the retainer engages with the annular furrow part of the corrugated pipe. The retainer pressing sleeve is prevented from sliding in the joint main body inner hole in the rear direction till a tip end of the corrugated pipe reaches a predetermined position at a rear part of the joint main body inner hole.

Description

  The present invention relates to a corrugated pipe joint for connecting a bellows-like corrugated pipe to a gas pipe (steel pipe) or the like. In particular, the present invention relates to a corrugated pipe joint that can reliably connect the corrugated pipe by a simple operation and can maintain a good airtight state.

FIG. 17 is a diagram schematically illustrating an example of a gas pipe in a building.
In this piping example, a gas meter 110 is installed outside the building 100, and a connecting portion (Chi) 103a is provided in the middle of a gas piping (steel pipe) 103 extending from the gas meter 110 toward the building 100 side. Yes. An end portion of the corrugated pipe T is connected to the connecting portion 103a through a corrugated pipe joint 101. The opposite end of the corrugated tube T is connected to the gas outlet 105. A gas device 107 such as a gas stove is connected to the gas outlet 105 through a rubber tube 106, for example, so that gas is supplied to the gas device 107.

Next, the corrugated tube T will be described.
FIG. 18 is a cross-sectional view showing the configuration of the corrugated tube.
As shown in FIG. 18, the corrugated tube T has a bellows-like flexible tube 2a (made of metal) having an annular unevenness formed on the outer periphery, and a resin-coated tube 2b covering the same. At the lower end of the corrugated tube T, the coated tube 2b is peeled off, and the inner flexible tube 2a is exposed. By exposing the flexible tube 2a in this way, a claw 43 of a retainer 40 described later is engaged with the annular recess on the outer periphery (see FIG. 6).

As this kind of corrugated pipe joint 101, there is one according to Patent Document 1 filed by the present applicant. The pipe joint described in the document is arranged in a cylindrical joint main body in which an inner hole for inserting a corrugated pipe is formed, a nut member slidable into the joint main body inner hole, and the inner hole. A cylindrical packing member and a retainer member that presses the packing member when the nut member slides and expands and contracts in the radial direction of the corrugated tube and engages with an annular recess on the outer periphery of the corrugated tube.
According to the pipe joint of Patent Document 1 configured as described above, the end portion of the corrugated pipe is fixed in the joint body by inserting the corrugated pipe into the joint body.

JP 2003-176888 A

Also in the conventional corrugated pipe joint described in Patent Document 1, the corrugated pipe can be connected by a relatively simple operation. However, in this type of joint, it is desirable to make the connection of the corrugated pipe more reliable or to further improve the hermetic sealability, and there is still room for further improvement in this respect. Furthermore, it is also desired that it is possible to easily confirm that the tip of the corrugated pipe has reached the depth of the inner hole of the joint body (no need for marking on the outer surface of the coated tube of the corrugated pipe).
The present invention has been made in view of the above problems, and an object thereof is to provide a corrugated pipe joint capable of reliably connecting a corrugated pipe with a simple operation and maintaining a good airtight state. It is in.

In order to achieve the above object, a corrugated pipe joint of one form serving as a base of the present invention includes a tubular joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted, An airtight packing disposed in the inner hole of the joint main body, which is in close contact with an outer peripheral surface of the corrugated pipe, and an inner diameter of the corrugated pipe disposed in the inner hole of the joint main body and capable of expanding and contracting, A retainer having an engaging claw, and a retainer pushing sleeve that slides in the inner direction in the joint body inner hole and pushes the retainer to reduce the diameter, whereby the retainer claw engages with the annular recess of the corrugated pipe And means for preventing the retainer pushing sleeve from sliding in the back direction unless the tip of the corrugated pipe reaches a predetermined position in the back of the inner hole of the joint body. Characterized in that it comprises.

  In using the corrugated pipe joint, first, the end of the corrugated pipe is inserted into the joint body, and the tip of the corrugated pipe is inserted to a predetermined position in the inner hole of the joint body. Next, when the retainer pushing sleeve is slid in the inner direction in the inner hole of the joint body and pushed to the final position, the retainer claw engages with the annular recess on the outer periphery of the corrugated pipe. By this series of operations, the end portion of the corrugated pipe is fixed so as not to be extracted from the joint body.

According to the corrugated pipe joint having such a configuration, when the corrugated pipe is pushed into the joint body, the retainer push sleeve is moved into the joint body if the tip of the corrugated pipe does not reach a predetermined position in the inner hole of the joint main body. It cannot be slid backward in the hole. If the tip of the corrugated tube does not reach the predetermined position but the retainer pushing sleeve can be slid in the depth direction, the appearance will appear to have been completed. In order to prevent such a situation, conventionally, the outer peripheral surface of the corrugated pipe is marked to confirm that the tip of the corrugated pipe has reached the predetermined position.
In this form of corrugated pipe joint, if the corrugated pipe is not fully inserted in the joint body, the retainer push sleeve cannot be pushed into the joint body. It is clear from both the appearance and work. That is, it can be confirmed that the tip of the corrugated tube has reached the predetermined position by sliding the retainer pushing sleeve in the depth direction. Therefore, it is not necessary to perform marking as in the prior art, and it is possible to eliminate the erroneous slide prevention collar of the retainer pushing sleeve.

  According to this corrugated pipe joint, the corrugated pipe can be reliably connected by a simple operation of pushing the tip of the corrugated pipe to the predetermined position and sliding the retainer pushing sleeve in the depth direction. And while the front-end | tip of a corrugated pipe | tube penetrates into an airtight packing fully, since the nail | claw of a retainer engages appropriately with the annular recessed part of a corrugated pipe | tube, there exists an advantage that a favorable airtight state can be maintained. In the present specification, the “predetermined position behind the inner hole of the joint main body” refers to a position where such an appropriate connection state is obtained.

Another embodiment of the corrugated pipe joint serving as the base of the present invention is a cylindrical joint body having an inner hole into which a corrugated pipe having an annular irregularity formed on the outer periphery is inserted, and the joint body inner hole. An airtight packing closely contacting the outer peripheral surface of the corrugated pipe, and a retainer disposed in the inner hole of the joint body and having a claw capable of expanding and contracting and engaging with an annular recess of the corrugated pipe when the diameter is reduced. A retainer pushing sleeve that slides in the inner direction in the inner hole of the joint body and pushes the retainer to reduce the diameter thereof, whereby the retainer claw engages with the annular recess of the corrugated pipe, and As long as the tip of the corrugated tube does not reach a predetermined position in the inner hole of the joint body, the retainer is engaged with the claw of the retainer to maintain the diameter of the retainer, and the tip of the corrugated tube is In the inserted stages to the position, which disengage the pawl of the retainer, characterized in that it comprises a retainer holder that enables reduced diameter of the retainer.

  In order to connect the corrugated pipe using the corrugated pipe joint having such a configuration, first, the corrugated pipe is inserted into the joint body. At this time, since the retainer is maintained in a diameter-expanded state by the retainer holder, even if the corrugated pipe is pulled back when the corrugated pipe is not sufficiently inserted into the joint body, the retainer is reduced in diameter and the corrugated It does not engage the annular recess of the tube and the corrugated tube is not connected. That is, when the corrugated pipe is pulled forward with insufficient insertion, the corrugated pipe is pulled out from the inside of the joint body, so that the operator has insufficient insertion of the corrugated pipe I can know that. When the operator inserts the corrugated tube again and inserts the tip of the corrugated tube to a predetermined position in the inner hole of the joint body, the retainer holder and the retainer claw are disengaged, and the retainer is reduced in diameter. Therefore, the joint connection in a state where the corrugated pipe is sufficiently inserted can be realized. And since the front-end | tip of a corrugated pipe | tube penetrates into an airtight packing fully, and the nail | claw of a retainer engages appropriately with the annular recessed part of this corrugated pipe | tube, a favorable airtight state can be maintained.

Another embodiment of the corrugated pipe joint serving as the base of the present invention is a cylindrical joint body having an inner hole into which a corrugated pipe having an annular irregularity formed on the outer periphery is inserted, and the joint body inner hole. An airtight packing closely contacting the outer peripheral surface of the corrugated pipe, and a retainer disposed in the inner hole of the joint body and having a claw capable of expanding and contracting and engaging with an annular recess of the corrugated pipe when the diameter is reduced. A corrugated pipe joint comprising: a retainer pushing sleeve that slides in the inner direction in the joint body inner hole and pushes the retainer to reduce the diameter, whereby the retainer claw engages with the annular recess of the corrugated pipe. In addition, as long as the tip of the corrugated tube does not reach a predetermined position in the inner hole of the joint body, the retainer is engaged with the claw of the retainer and the retainer is maintained in an expanded state, When the leading end of the rugate tube is inserted to the predetermined position, the retainer holder is disengaged from the retainer claw and enables the retainer to have a reduced diameter, and the leading end of the corrugated tube reaches the predetermined position. Before reaching, the retainer having the claw engaged with the retainer holder is prevented from moving in the back direction, thereby preventing the retainer pushing sleeve from sliding in the back direction, and the corrugated When the tip of the tube is inserted to the predetermined position, the retainer having the claw disengaged from the retainer holder can be moved in the back direction, and thereby the retainer pushing sleeve of the retainer pushing sleeve can be moved. A means for enabling sliding in the back direction is provided.
According to the corrugated pipe joint having such a configuration, the functions and effects of each corrugated pipe joint described above can be exhibited.

In the corrugated pipe joint according to the above aspect, the retainer holder has a rising portion that contacts the inner side of the retainer claw and maintains the retainer in an expanded state, and means for preventing the retainer pushing sleeve from sliding. As described above, a retainer engagement step portion that engages with the outer periphery of the retainer in the expanded diameter state may be provided in the joint body inner hole.
According to such a configuration, since the retainer holder prevents the retainer from reducing its diameter, the outer periphery of the retainer is maintained in a state of being engaged with the retainer engagement step portion. Therefore, in this state, since the retainer itself cannot move in the inner direction in the joint body inner hole, the retainer pushing sleeve can be prevented from sliding in the inner direction.

In the corrugated pipe joint according to the above aspect, each contact surface where the retainer and the retainer pushing sleeve contact each other can be formed as a tapered surface that expands in the sliding direction of the retainer pushing sleeve.
According to such a configuration, the claw of the retainer can move in the diameter reducing direction by the sliding engagement between the tapered surfaces.

In the corrugated pipe joint according to the present invention, the corrugated pipe is in a diameter-expanded state until the tip of the corrugated pipe reaches a position in front of the predetermined position behind the inner hole of the joint body (front position). Prevents the joint body inner hole from moving in the back direction, and allows the retainer holder to move in the back direction when the tip of the corrugated tube is inserted to the front position. An expansion / contraction ring can be provided. When the expansion / contraction ring is in a diameter-expanded state, it is engaged with an expansion / contraction ring engagement step provided in the joint body inner hole, and when the expansion / contraction ring is in a diameter-reduced state, the expansion / contraction ring engagement step. It is possible to move away from the portion in the depth direction.
As described above, in one embodiment of the present invention, while the retainer holder cannot move in the back direction within the joint body inner hole, the retainer itself cannot move in the back direction. I can't let you. Therefore, according to the above configuration, it can be determined that the tip of the corrugated pipe has reached the depth of the joint body inner hole only after the retainer pushing sleeve can be slid in the depth direction.

In the corrugated pipe joint according to the present invention, the corrugated pipe is maintained in a state in which the diameter of the corrugated pipe is in contact with the inner peripheral surface of the expansion / contraction ring and the diameter of the corrugated pipe is expanded until the front end of the corrugated pipe does not reach the front position When the front end of the ring is inserted to the far side front position, a stopper that allows the diameter of the ring to be reduced can be provided by being removed from the inner peripheral surface of the expansion / contraction ring with the insertion.
According to such a configuration, the stopper comes into contact with the tip of the corrugated tube and is pushed out by the corrugated tube, so that the stopper is removed from the expansion / contraction ring. Can be confirmed.

The corrugated pipe joint according to another aspect of the present invention includes a tubular joint body having an inner hole into which a corrugated pipe having an annular concavo-convex formed on the outer periphery is inserted, and the joint body inner hole, An airtight packing that is in close contact with the outer peripheral surface of the corrugated pipe, a retainer that is disposed in the inner hole of the joint body and has a pawl that can expand and contract and engages with the annular recess of the corrugated pipe when the diameter is reduced; A retainer pushing sleeve that slides in the inner direction in the body hole and pushes the retainer to reduce the diameter, whereby the retainer claw engages with the annular recess of the corrugated tube, and further, the airtight packing The corrugated pipe disposed on the outer periphery is in a diameter-expanded state until the tip of the corrugated pipe does not reach the inner hole of the joint body, and is in a reduced diameter state when the tip of the corrugated pipe is inserted to the back. Tighten the serial airtight packing outer circumferential surface, characterized in that it comprises a scaling ring pressing the packing inner peripheral surface to the corrugated pipe outer peripheral surface.
According to the corrugated pipe joint having such a configuration, the expansion / contraction ring tightens the outer peripheral surface of the hermetic packing so that the inner peripheral surface of the packing is in close contact with the outer peripheral surface of the corrugated pipe, thereby improving the hermetic sealing performance of the packing. be able to.

In the corrugated pipe joint, the expansion / contraction ring moves to a portion having a smaller diameter than the diameter of the ring in an expanded state provided on the inner side of the joint body inner hole after the diameter reduction is enabled. The reduced diameter state is maintained, whereby the inner peripheral surface of the hermetic packing can be pressed against the outer peripheral surface of the corrugated pipe.
According to such a configuration, since the tight contact state between the inner peripheral surface of the airtight packing and the outer peripheral surface of the corrugated pipe by the expansion / contraction ring can be strengthened, the hermetic sealing performance of the packing can be further enhanced. Alternatively, a sufficient tightening force can be obtained even when the rigidity and elasticity of the ring are low.

In the corrugated pipe joint, as long as the tip of the corrugated pipe does not reach the predetermined position, the retainer engages with a claw of the retainer to maintain the diameter of the retainer, and the tip of the corrugated pipe is A retainer holder that disengages the retainer claw when inserted to the predetermined position and enables the retainer to have a reduced diameter; and the hermetic packing is provided in the inner hole of the joint body. When the retainer pushing sleeve is pushed in the back direction, the retainer is pushed and moved in the back direction, whereby the holder is pushed in the back direction and the The packing can be compressed.
According to such a configuration, the airtightness of the airtight packing itself can be further enhanced.

Another aspect of the corrugated pipe joint related to the present invention is a cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted, and the corrugated pipe joint disposed in the joint body inner hole. An airtight packing that is in close contact with the outer peripheral surface of the corrugated pipe, and a retainer that is disposed in the joint body inner hole and has a claw that can expand and contract and engages with the annular recess of the corrugated pipe when the diameter is reduced. A retainer pushing sleeve in which the retainer claw is engaged with an annular recess of the corrugated pipe by sliding backward in the inner hole of the joint main body to push the retainer, and the tip of the corrugated pipe is As long as it does not reach a predetermined position in the inner hole of the joint body, it engages with the retainer claw to maintain the diameter of the retainer, and the tip of the corrugated pipe is inserted to the predetermined position. The retainer holder is disengaged from the retainer claw at the stage, and the retainer holder can be reduced in diameter, and the retainer holder is engaged unless the tip of the corrugated tube reaches the predetermined position. The retainer having the claw is prevented from moving in the back direction, thereby preventing the retainer pushing sleeve from sliding in the back direction, and the tip of the corrugated tube is inserted to the predetermined position. Means for allowing the retainer having the claw disengaged from the retainer holder in the stage to move in the back direction, thereby allowing the retainer pushing sleeve to slide in the back direction; The means starts operating when the tip of the corrugated pipe reaches a position (a position in front of the back) of a predetermined position behind the inner hole of the joint body, When the corrugated tube is pulled back while the distal end of the gate tube passes the front position and before the predetermined position, the means returns to the initial state before the corrugated tube is inserted. And

  A specific aspect of the corrugated pipe joint is as follows: a cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted; and the corrugated body disposed in the joint body inner hole. An airtight packing that is in close contact with the outer peripheral surface of the pipe, a retainer that is disposed in the inner hole of the joint body and has a claw that can expand and contract and engages with the annular recess of the corrugated pipe when the diameter is reduced, and the joint body A retainer push sleeve in which the retainer claw engages with an annular recess of the corrugated pipe by sliding in the inner direction in the inner hole and pushing the retainer to reduce its diameter, and the tip of the corrugated pipe is located in the joint body As long as it does not reach a predetermined position at the back of the hole, the retainer is engaged with the claw of the retainer to maintain the diameter of the retainer, and the corrugated tube is inserted into the predetermined position. A retainer holder that is disengaged from the retainer claw at the floor and enables the retainer to be reduced in diameter, and engages with the retainer holder until the tip of the corrugated tube does not reach the predetermined position. The retainer having the claw is prevented from moving in the back direction, thereby preventing the retainer pushing sleeve from sliding in the back direction, and the tip of the corrugated tube is inserted to the predetermined position. The retainer having the claw disengaged from the retainer holder can be moved in the back direction, thereby enabling the retainer pushing sleeve to slide in the back direction. The means is in a diameter-expanded state until the tip of the corrugated pipe does not reach a position in front of the predetermined position behind the inner hole of the joint body (front position). The retainer holder is prevented from moving in the inner hole depth direction of the joint body, and the diameter of the retainer holder is reduced when the tip of the corrugated tube is inserted to the front side position. An expansion / contraction ring portion, and a stopper portion connected to the inner peripheral side of the expansion / contraction ring portion and projecting into the inner hole of the joint body, wherein the corrugated tube is inserted into the front position when the distal end of the corrugated tube is inserted. A stopper portion that abuts the tube tip, and accordingly the diameter of the expansion / contraction ring portion, and an outer peripheral portion of the hermetic packing formed on the inner diameter portion of the expansion / contraction ring portion when the diameter of the expansion / contraction ring portion decreases. And a hook portion that engages with the expansion / contraction ring portion and the hermetic packing, and the tip of the corrugated pipe passes through the front position and is in front of the predetermined position. When the corrugated tube is pulled back to the front it is characterized in that the trigger is returned to the initial state prior to insertion the corrugated tube.

  According to the present invention, when the corrugated tube is erroneously pulled back before the tip of the corrugated tube reaches the predetermined position, the means for allowing the retainer pushing sleeve to slide returns to the initial state. That is, the airtight packing together with the corrugated pipe in the embodiment and the trigger engaged with the packing are pulled back, and the trigger returns to the initial position before the corrugated pipe is inserted. During this time, the retainer holder is kept engaged with the claw of the retainer. That is, until the tip of the corrugated tube pushes the stopper part of the trigger and the tip reaches the predetermined position, the retainer holder does not come off the retainer, and a normal connection is possible when the corrugated tube is inserted again by a formal method. .

  In the present invention, the retainer holder has a rising portion that abuts the inside of the retainer claw and maintains the retainer in an expanded state, and as a means for preventing the retainer pushing sleeve from sliding, A retainer engagement step portion that engages with the outer periphery of the retainer in a state can be provided in the joint body inner hole.

  In the present invention, when the expansion / contraction ring portion is in a diameter-expanded state, the expansion / contraction ring portion is engaged with an expansion / contraction ring portion engagement step provided in the joint body inner hole, and the expansion / contraction ring portion is in a diameter-reduced state. In some cases, the expansion / contraction portion can be moved away from the ring engaging step portion in the depth direction.

  In the present invention, the expansion / contraction ring portion moves to a portion having a diameter smaller than the diameter of the ring portion in the diameter expansion state provided on the back side of the joint body inner hole after the diameter reduction is possible. The reduced diameter state is maintained, whereby the inner peripheral surface of the hermetic packing can be pressed against the outer peripheral surface of the corrugated pipe.

  In the present invention, the hermetic packing is disposed on the back side of the retainer holder in the joint body inner hole, and when the retainer pushing sleeve is pushed in the back direction, the retainer is placed in the back direction. It is preferable that the holder is pushed and moved, whereby the holder is pushed in the back direction and the packing is compressed.

  In the present invention, the trigger is made of an elastically deformable material, a short substantially cylindrical support part, an expansion / contraction ring part integrally provided at the upper edge end of the support part, and a lower end of the support part A stopper portion provided integrally with an edge, and the expansion / contraction ring portion is a plurality of ring pieces arranged at equal intervals with a slit in a circumferential direction on an upper end edge of the support portion, The ring piece comprises a ring piece provided with a hook portion projecting inwardly on the inner diameter portion of the ring piece, and the stopper portion is at the same circumferential position as the ring piece of the expansion / contraction ring at the lower end edge of the support portion. It is preferable that the stopper pieces are a plurality of stopper pieces arranged with the slits therebetween and having a bottom portion projecting inward from the lower end of the stopper piece.

  Further, when the bottom portion of the stopper portion is pushed by the tip of the corrugated tube, the bottom portion is deformed outward with respect to the support portion, and the expansion / contraction ring portion is deformed inward with respect to the support portion. Thus, it is preferable that the expansion / contraction ring has a reduced diameter, and the hook portion engages with an outer peripheral portion of the airtight packing to lock the expansion / contraction ring portion to the airtight packing.

  Furthermore, a circumferential groove is formed on the outer peripheral surface of the hermetic packing so that the catch portion of the trigger engages, and a circumferential protrusion is formed at the same height as the circumferential groove on the inner peripheral surface of the packing. Is preferably formed.

  By forming the circumferential groove in the hermetic packing, the catch portion of the trigger is easily caught, and both can be tightly connected. However, if the circumferential groove is formed, the thickness of the packing is reduced at that portion. Therefore, by forming a circumferential projection on the opposite surface (inner circumferential surface) of the circumferential groove, the strength of the same portion is maintained, and the packing between the expansion / contraction ring portion of the trigger and the outer peripheral surface of the corrugated pipe The compression force increases and the expansion / contraction ring of the trigger that has entered the circumferential groove easily returns to the original state. Furthermore, the frictional force between the corrugated tube and the packing can be adjusted by the height and shape of the circumferential protrusion, and the force at the time of inserting and extracting the corrugated tube can be set to a desired level.

  In the present invention, it is preferable that the upper edge of the rising portion of the retainer holder extends outward.

Since the upper edge of the rising portion of the retainer holder spreads outward, each claw of the retainer has a larger diameter. Note that the clearance between the claw and the joint body needs to be wide enough for the claw to greatly expand in diameter.
The reason why the outer edge of the rising portion of the retainer holder spreads outward is as follows. When the corrugated tube T is accidentally pulled out after the corrugated tube T is completely inserted, both the packing and the retainer holder are pulled forward due to friction between the outer peripheral surface of the corrugated tube and the packing. At this time, the stopper ring tip of the retainer holder hits the claw portion of the retainer and pushes up the claw portion, but the tip of the stopper ring spreads outward, so that it securely touches the lower surface of the claw portion and pushes up the claw portion. Can do.
In addition, even when the retainer is released from the retainer holder due to aging of the retainer, the retainer holder stopper ring does not sufficiently reduce the diameter and the inner diameter of the claw is the same as the outer diameter of the retainer holder. The tip can push up the lower surface of the retainer claw more reliably.

  In this invention, it is preferable that the elastic material is arrange | positioned on the outer side of the outer peripheral surface of the said retainer of the said joint main body inner hole.

By arranging the elastic material, the resistance for expanding the diameter of the claw is increased, and when removing the retainer holder from the retainer, it is necessary to push the corrugated tube with a strong force. Thereby, the front-end | tip of a corrugated pipe | tube can fully enter into packing.
In this case, there is no need to provide a stepped portion for locking the trigger on the joint body. This is due to the following reason. When the elastic material is not disposed, the trigger is locked to the step portion so that the trigger and the packing do not move in the back direction until the tip of the corrugated tube hits the stopper portion of the trigger. When the elastic material is disposed outside the outer peripheral surface of the retainer, resistance is given to the diameter of the retainer when the corrugated tube is inserted, and the retainer is difficult to expand. That is, it becomes difficult for the retainer holder to be detached from the retainer. For this reason, the packing to which the retainer holder is fixed and the trigger engaged with the packing are held together with the retainer holder, and movement in the back direction is prevented.

  According to the present invention, as described above, it is possible to provide a corrugated pipe joint that can reliably connect the corrugated pipe by a simple operation and can maintain a good airtight state.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the corrugated pipe joint of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view for explaining an outline of a corrugated pipe joint according to one embodiment of the present invention. FIG. 1 (A) is a diagram showing an initial state of the joint, and FIG. 1 (B) shows a final state of the joint (a construction completion state in which a corrugated pipe is inserted).
In the following description, unless otherwise specified, the “vertical direction” refers to the direction indicated by the arrow in FIG. “Front” refers to the upper side of the figure (the original side of the corrugated pipe), and “back” refers to the lower side of the figure (the front side of the corrugated pipe).

First, an outline of the corrugated pipe joint 1 will be described.
As shown in FIG. 1 (A), the corrugated pipe joint 1 has a cylindrical joint body 10 in which various parts (not shown) are arranged (details will be described later), and is slidable with respect to the joint body 10. And a retainer pushing sleeve 50 provided.

  When the corrugated pipe joint 1 is used, generally, as shown in FIG. 1B, after inserting the end of the corrugated pipe T into the joint 1, the retainer pushing sleeve 50 is attached to the joint body 10 The corrugated tube T is fixed in the joint main body 10 by being pushed toward (to be described later with reference to FIGS. 2 to 7 and the like). The “corrugated pipe joint” which is the subject of the present invention is for fixing the end of the corrugated pipe T inside the joint and connecting it to other piping elements. The corrugated tube T is as described above with reference to FIG.

Next, the internal structure of the corrugated pipe joint 1 will be described in detail with reference to FIGS. 2 to 7 and drawings showing individual components as appropriate.
FIG. 2 is a cross-sectional view of the corrugated pipe joint of FIG. 1 and shows an initial state before the corrugated pipe is connected, in which the corrugated pipe is not inserted. 2A is an overall cross-sectional view, and FIG. 2B is a partially enlarged cross-sectional view thereof.
3 (A), (B) to FIG. 7 (A), (B), (C), (D), (E) are diagrams showing a series of operations when this corrugated pipe joint is used. . FIGS. 3A and 3B show a state in which a corrugated tube is inserted into the joint from the state of FIGS. 2A and 2B. 4 (A) and 4 (B) show a state in which the corrugated pipe is then pushed to a position in front of the predetermined position behind the joint body, and FIGS. 5 (A) and 5 (B) further show the corrugated pipe. 6 (A) and 6 (B) show the state in which the retainer push sleeve is pushed to the final position and the corrugated pipe is finally fixed (construction completed state). Show.
7 (A), (B), (C), (D), and (E) are drawings in which these FIGS. 2 (A) to 6 (A) are combined into one sheet to easily show a series of operations. It is.

  As shown in FIG. 2, the corrugated pipe joint 1 includes a tubular joint body 10 and a retainer pushing sleeve 50 that can slide relative to the tubular joint body 10 as described above. A retainer 40 including a claw 43 is disposed inside the joint body 10. The retainer 40 is capable of expanding and contracting, and when the diameter is reduced, the claw 43 engages (inserts) into the annular recess on the outer periphery of the corrugated tube T to fix the corrugated tube T as shown in FIG. To do. A thin, substantially cylindrical retainer holder 70 having a slit 70a is disposed on the inner hole back side (the lower side in the drawing) from the retainer 40. The holder 70 is in contact with the claw 43 of the retainer 40 and maintains the diameter-expanded state of the retainer 40. The holder 70 is integrated so as to be surrounded by the fireproof packing 35 formed in a substantially cylindrical shape. An airtight packing 31 formed in a stepped substantially cylindrical shape is disposed on the inner hole deeper side (lower side in the drawing) than the holder 70. The packing 31 seals between the outer periphery of the corrugated pipe T and the inner periphery of the joint body 10. An expansion / contraction ring 60 and a stopper 80 are disposed on the inner hole depth side (the lower side in the drawing) from the packing 31. The ring 60 clamps the airtight packing 31 and presses it against the corrugated tube T. The stopper 80 contacts the tip of the corrugated tube T to be inserted. The retainer 40, the retainer holder 70, the fireproof packing 35, the airtight packing 31, the expansion / contraction ring 60, and the stopper 80 are movable in the vertical direction inside the joint body 10.

  Although details will be described later, when the retainer holder 70 is moved from the state of FIG. 3 in the inner hole depth direction by inserting the corrugated tube T to the back, the claw 43 of the retainer 40 hooked on the holder 70 is moved to the holder holder 70. It is possible to engage with the annular recess on the outer periphery of the corrugated tube T by being separated from the 70. As described above, the corrugated pipe joint 1 according to the present embodiment is characterized in that the retainer holder 70 moves in conjunction with the insertion of the corrugated pipe T and the claw 43 of the retainer 40 is detached from the holder 70. is there.

Hereinafter, each of the above components will be described in order.
First, the joint body 10 will be described with reference to FIGS.
FIG. 8 is a cross-sectional view showing a single joint body. FIG. 8A is a longitudinal sectional view, and FIG. 8B is a partially enlarged sectional view thereof.
As shown in FIG. 8, the joint body 10 is a cylindrical body made of a copper alloy as an example, and has a body portion 10 </ b> A having a relatively large outer diameter and a relatively small outer diameter formed at the lower end thereof. And a small connecting portion 10B.

  The connection part 10B is a part for connecting the joint main body 10 to the connection part (Chi 103a, see FIG. 1) of the gas pipe. Although not shown in detail in FIG. 8, a male screw is cut on the outer periphery of the connecting portion 10B, and the male screw is screwed into, for example, the Qi 103a as shown in FIG. The main body 10 can be fixed to the gas pipe. As shown in FIGS. 1 and 8, a tool engaging portion 10t having a polygonal cross-sectional shape is formed at a portion near the outer periphery of the main body portion 10A. When the joint body 10 is screwed into the cheek 103a, a tool such as a spanner can be engaged with the tool engaging portion 10t to rotate the joint body 10 as a whole.

As shown in FIG. 8, the inside of the joint body 10 is an inner hole 11 penetrating vertically. The inner hole 11 is roughly divided into two parts having different inner diameters (from the upper side, the retainer holder etc. accommodating part 25 and the lower inner hole part 29).
The retainer holder accommodating portion 25 is formed from the upper end opening of the joint main body 10 to slightly below the center of the main body 10. As shown in FIG. 2, the retainer holder accommodating portion 25 is inserted with a cylindrical insertion portion 53 (detailed below) of the retainer pushing sleeve 50, and the retainer 40, the fireproof packing 35, the retainer holder 70, and the airtight packing 31. This is a part where the expansion / contraction ring 60 and the stopper 80 are disposed.

An annular ring groove 22j is dug in a portion near the upper end opening in the inner periphery of the retaining portion 25 such as the retainer holder. The ring groove 22j includes a rectangular groove 22a having a rectangular cross section, and a tapered groove 22b formed so as to sag downward from the lower end edge of the rectangular groove 22a. A stop ring R2 (details will be described later) is fitted into the square groove 22a in the initial state of FIG. The depth of the square groove 22a is smaller than the diameter of the core wire of the ring R2.
As will be described later, the stop ring R2 (see FIG. 2) is released from the ring groove 22j as the retainer pushing sleeve 50 is pushed into the joint body 10, and finally enters the square groove 22k (FIG. 6). reference). The rectangular groove 22k is an annular groove having a rectangular cross section formed on the inner circumference of the joint body 10 below the ring groove 22j. The depth of the square groove 22k is substantially the same as the depth of the square groove 22a, that is, smaller than the diameter of the core wire of the ring R2.

  A retainer engagement step 22m having a surface perpendicular to the axis of the joint body 10 is formed further below the square groove 22k. The retainer engaging step portion 22m is formed in a step protruding inward, and the outer peripheral portion (see FIG. 11C) of the lower end tapered surface 45b of the retainer 40 whose diameter is expanded by the retainer holder 70 is pressed against the retainer engaging step portion 22m. It is possible. The retainer 40 is prevented from being reduced in diameter by the retainer holder 70, and the retainer engagement step portion 22 m is prevented from moving in the inner hole depth direction of the joint body 10.

  On the further lower side than the retainer engagement step portion 22m, an expansion / contraction ring engagement first step portion 22p and an expansion / contraction ring engagement second step portion 22q having a surface perpendicular to the axis of the joint body 10 are expanded / contracted. It is formed in two steps with the dynamic taper surface 22r and the expansion / contraction ring sliding vertical surface 22s interposed therebetween. The first step portion 22p is formed in a step protruding further inward than the retainer engagement step portion 22m, and the lower surface 60b (see FIG. 15C) of the expansion / contraction ring 60 before being moved is pressed against it. The second step portion 22q is formed in a step protruding further inward than the first step portion 22p, and the lower surface 60b of the expansion / contraction ring 60 after the movement is pressed against it. The expansion / contraction ring sliding taper surface 22r is formed so as to sag downward from the edge of the first step portion 22p. An inner hole portion to which the stopper 80 can move is formed further below the second step portion 22q.

  A lower inner hole portion 29 having a smaller diameter than the housing portion 25 is formed under the retainer holder housing portion 25 configured as described above. A boundary portion between the accommodating portion 25 and the lower inner hole portion 29 is formed in a step shape. The lower end of the lower inner hole portion 29 is connected to the lower end opening of the joint body 10.

Next, the retainer pushing sleeve 50 will be described with reference to FIG.
FIG. 9 is a longitudinal sectional view of the retainer pushing sleeve alone. As can be seen from FIG. 9, the retainer pushing sleeve 50 is a cylindrical member having an inner hole through which the corrugated pipe T can pass.

  The upper end side of the retainer pushing sleeve 50 is a large diameter portion 51 having a relatively large outer diameter, and the remaining portion on the lower end side is a cylindrical insertion portion 53 having a relatively small outer diameter. The outer diameter of the cylindrical insertion portion 53 is formed to be slightly smaller than the inner diameter of the inner hole 11 of the joint body 10 (see FIG. 8), so that the cylindrical insertion portion 53 can slide into the inner hole 11. ing. The outer diameter of the large-diameter portion 51 of the retainer pushing sleeve 50 is formed substantially equal to the outer diameter of the joint body 10. As a result, as shown in FIG. 1B, the outer peripheral surface of the large-diameter portion 51 and the outer peripheral surface of the joint body 10 are connected in a state where the retainer pressing sleeve 50 is pressed.

  As shown in FIG. 9, an annular packing groove 51 a is formed inside the large diameter portion 51 of the retainer pushing sleeve 50. A watertight packing 55 (see FIG. 2) is fitted into the packing groove 51a. The watertight packing 55 is made of an elastic body and seals between the inner peripheral surface of the retainer pushing sleeve 50 and the outer peripheral surface of the corrugated pipe T (see FIGS. 2 to 7). Thereby, the penetration | invasion of the water etc. which cause the corrosion in the coupling main body 10 from the outside is prevented.

As shown in FIG. 9, a through hole 53 h that penetrates the side wall in the lateral direction is formed near the upper end of the cylindrical insertion portion 53 (near the boundary between the large diameter portion 51 and the cylindrical insertion portion 53). Yes. A ventilation member 59 (see FIG. 2) is closely fitted in the through hole 53h.
The ventilation member 59 is formed of a microporous material made of polymer polyethylene or the like, and has a property of allowing gas to pass but not allowing a solid or liquid to pass. By the way, when a hole is opened in the corrugated tube T due to, for example, an operator's nailing mistake or the like, the gas leaked from this hole passes between the metal tube portion 2a of the corrugated tube T and the coated tube 2b coated thereon. Then, the gas flows into the joint 1 and the gas is discharged to the outside through the ventilation member 59. In the case of the configuration in which the leaked gas does not leak from an unexpected part of the joint 1 but leaks from a predetermined part (the ventilation member 59) set in advance in this way, an advantage that gas leakage can be easily detected. There is. That is, it is possible to detect whether gas is leaking by holding the gas detection device over the ventilation member 59.

As shown in FIG. 9, on the outer peripheral surface of the cylindrical insertion portion 53 of the retainer pushing sleeve 50, an annular O-ring groove for fitting an O-ring R1 (see FIG. 2) is provided immediately below the through hole 53h. 53j is dug. The O-ring R <b> 1 tightly seals between the outer peripheral surface of the retainer pushing sleeve 50 and the inner peripheral surface of the joint body 10 in the construction completion state shown in FIG. 6.
An annular stop ring groove 53k is dug under the O-ring groove 53j. A stop ring R2 is fitted into the stop ring groove 53k (see FIGS. 2 and 6). The depth of the stop ring groove 53k is larger than the diameter of the core wire of the stop ring R2. The stop ring R2 is fitted between the groove 53k on the retainer pushing sleeve 50 side and the groove 22k on the joint body 10 side in the construction completion state shown in FIG. 6, and fixes the sleeve 50 and the body 10 together.

  An inner peripheral tapered surface 57 is formed on the inner peripheral edge at the lower end of the retainer pushing sleeve 50. The inner peripheral tapered surface 57 is formed so as to sag upward from the lower end of the cylindrical insertion portion 53. As will be described later, the inner peripheral tapered surface 57 is a surface that presses against the outer peripheral tapered surface 47a (see FIG. 11C) of the retainer 40. Ultimately (see FIG. 6), these two tapered surfaces 57 and 47a are in surface contact with each other.

Next, the retainer 40 will be described with reference to FIGS.
FIG. 10 is a perspective view showing the external appearance of the retainer alone. 11A and 11B are views showing the retainer, in which FIG. 11A is a plan view, FIG. 11B is a partial cross-sectional front view, and FIG. 11C is an enlarged cross-sectional view showing an A portion of FIG. FIG.
The retainer 40 is a resin molded product as an example, and includes a support portion 42 formed in an annular shape and a plurality of (in this example, six) claws 43 integrally provided at the lower end edge of the support portion 42. Have. The outer diameter of the ring-shaped support portion 42 is formed to be slightly smaller than the inner diameter of the cylindrical insertion portion 53 (see FIG. 2) of the retainer pushing sleeve 50, so that the inner diameter of the cylindrical insertion portion 53 is increased. It can be inserted.

As shown in FIG. 11A, the claws 43 are arranged at equal intervals in the circumferential direction of the ring-shaped support portion 42, and there are slits 43a between them. As will be described later, each claw 43 moves in the diameter reducing direction (arrow A direction) while being elastically deformed, and engages with an annular recess on the outer periphery of the corrugated pipe T. In view of such a function of the claw 43, it is preferable that the claws 43 are arranged at equal intervals in that the corrugated tube T can be held stably and uniformly.
More specifically, each claw 43 of the retainer 40 includes, as shown in FIG. 11 (C), a base portion 47 formed integrally with the ring-shaped support portion 42, and brass or the like embedded in the lower portion of the base portion 47. A claw member 45 made of (example) is provided. In this configuration, the boundary portion between the ring-shaped support portion 42 and the base portion 47 can be elastically deformed, so that the claw 43 can move in the diameter reducing direction (arrow A direction).

The tip 45 a of each claw member 45 protrudes toward the inside in the radial direction of the ring portion 42. Further, in the initial state (no load state) of the retainer 40 as shown in FIG. 11A, the diameter of the circle C45 formed by the tip 45a of each claw 43 is larger than the outer diameter of the corrugated tube T. It can be passed through the retainer 40.
However, the present invention is not limited to this. Even when the diameter of the circle C45 formed by the tip 45a of each claw 43 is substantially the same as or smaller than the outer diameter of the corrugated tube T when the retainer 40 is unloaded, the corrugated tube T There is no hindrance to insertion. If the claw 43 of the retainer 40 is elastically deformed radially outward when passing through the corrugated pipe T, the corrugated pipe T can pass through without any problem even if the diameter of the circle C45 is somewhat small. is there.

As shown in FIG. 11C, the outer surface of each base 47 is an outer peripheral tapered surface 47a. The outer peripheral tapered surface 47a is formed so as to be tapered inward as it goes upward, and is a surface that presses against the inner peripheral tapered surface 57 of the retainer pressing sleeve 50 described above.
A vertical straight surface 47b is formed continuously at the lower end of each outer peripheral tapered surface 47a. Furthermore, a lower end taper surface 45b is formed so as to follow the lower end of the straight surface 47b and squeeze inward as it goes downward. The lower end tapered surface 45b is a surface that is pressed against the retainer engagement step portion 22m when the diameter is expanded by the retainer holder 70.

Next, the retainer holder 70 will be described with reference to FIGS.
FIG. 12 is an external perspective view of the retainer holder. FIG. 13: is a figure which shows the holder, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A).
The retainer holder 70 is made of metal as an example, and has a base portion 73 and a stopper ring 71 as shown in FIGS. As shown in FIGS. 12 and 13A, the base portion 73 is formed in an annular shape as a whole, and as shown in FIGS. 12, 13B and 13C, the inner periphery of the upper surface of the base portion 73 is formed. The part is provided with a stopper ring 71. The stopper ring 71 is composed of a plurality of rising pieces 71 a (eight in this example) rising upward from the upper surface of the base portion 73.
The outer diameter C71 of the stopper ring 71 is slightly larger than a circle C45 (see FIG. 11) formed by the tips of the claws 43 of the retainer 40 in a natural shape. As shown in FIG. 2, the stopper ring 71 is set inside each claw 43 of the retainer 40. Thereby, each nail | claw 43 of the retainer 40 elastically deforms to the state expanded diameter rather than the natural shape, and is maintained in the state.

The retainer holder 70 may be made of resin. Further, the stopper ring 71 can be variously changed in shape as long as the stopper ring 71 plays a role of maintaining the diameter of the claw 43 of the retainer 40, and is not composed of a plurality of rising pieces 71a. It can also be a cylindrical structure. The number of stopper rings 71 is not limited to eight and can be changed as appropriate.
The retainer holder 70 and the airtight packing 31 are preferably bonded or integrally formed (including metal wrapping). As a result, when the flexible tube is inserted, the airtight packing moves to the back, and at the same time, the retainer holder can also move to the back.

Next, the fireproof packing 35 will be described.
As shown in FIG. 2, the fireproof packing 35 is an annular member that is thinner than the airtight packing 31, and the lower surface of the packing 35 substantially abuts on the upper surface of the base portion 73 of the retainer holder 70. The surface is substantially in contact with the outer peripheral surface of the stopper ring 71 of the holder 70. For example, the fireproof packing 35 is made of a material obtained by mixing NBR with expanded graphite. When the fireproof packing 35 becomes high temperature due to a fire or the like, the packing 35 expands and deforms and seals between the outer periphery of the corrugated pipe T and the inner periphery of the joint body 10 through the slit 70a of the retainer holder 70.

Next, the airtight packing 31 will be described with reference to FIG.
FIG. 14 is a view showing a single airtight packing, in which (A) is a plan view, (B) is a front view, and (C) is a cross-sectional view taken along the line AA in (A).
As shown in FIG. 14, the hermetic packing 31 is a stepped substantially cylindrical member having a relatively large thickness, and is made of NBR (nitrile rubber) as an example. The upper end side of the airtight packing 31 is a thick portion 31a having a relatively large outer diameter, and the remaining portion on the lower end side is a thin portion 31b having a relatively small outer diameter. The hermetic packing 31 has an inner hole 31h, and the inner diameter of the inner hole 31h is slightly smaller than the outer diameter of the corrugated tube T. The vicinity of the inlet of the inner hole 31h is chamfered to facilitate the insertion of the corrugated tube T (C surface 31c).

  The hermetic packing 31 is a member that slides up and down within the joint body 10. In order to make this sliding smooth, and in order to make the corrugated tube T smoothly inserted into the inner hole 31h of the airtight packing 31, silicon oil is applied to the inner and outer peripheral surfaces (or at least one of them) of the packing 31. A lubricant such as the above may be applied.

Next, the expansion / contraction ring 60 will be described with reference to FIG.
15A and 15B are diagrams showing a single expansion / contraction ring, where FIG. 15A is a plan view, FIG. 15B is a front view, and FIG. 15C is a cross-sectional view taken along the line AA in FIG.
As shown in FIG. 15, the expansion / contraction ring 60 is an annular member, and is made of stainless steel as an example. The expansion / contraction ring 60 has a split 61 in part, and notches 62 cut into a rectangular shape from the outer peripheral edge to the inside in the radial direction are formed at substantially equal intervals in the circumferential direction so that the diameter can be increased or decreased. It has become.

  The expansion / contraction ring 60 is in a diameter-expanded state when the outer peripheral wall 82 (see FIG. 16) of the stopper 80 is in contact with the inner peripheral surface thereof, and is contracted when the outer peripheral wall 82 of the stopper 80 is removed. In order to easily remove the edge portion 82a (see FIG. 16C) provided on the outer edge of the top portion of the outer peripheral wall 82 of the stopper 80 and locking the expansion / contraction ring 60, from the ring 60, The inner edge portion of the upper surface of the ring 60 is chamfered as shown in FIGS. 15A and 15C (C surface 60a). In the expanded state, the expansion / contraction ring 60 is engaged with the lower surface 60b shown in FIGS. 15B and 15C pressed against the expansion / contraction ring engagement first step 22p (see FIGS. 2 and 3). In the reduced diameter state, the first step portion 22p is disengaged (see FIG. 4), and the expansion / contraction ring sliding taper surface 22r and the expansion / contraction ring sliding vertical surface 22s are slid to finally expand and contract the lower surface 60b. It is pressed against and engaged with the ring engagement second step 22q (see FIGS. 5 and 6).

Next, the stopper 80 will be described with reference to FIG.
16A and 16B are views showing the stopper, in which FIG. 16A is a plan view, FIG. 16B is a front view, and FIG. 16C is a cross-sectional view taken along the line AA in FIG.
The stopper 80 is made of metal as an example, and is a dish-like member having a circular bottom surface 81 and a cylindrical outer peripheral wall 82 as shown in FIG. A circular hole 81 a is drilled in the bottom surface 81 of the stopper 80. The diameter of the hole 81a is drilled so as to be smaller than the tip diameter of the corrugated tube T (see FIG. 18), and the tip of the corrugated tube T comes into contact with the bottom surface 81 around the hole 81a. . As shown in FIG. 16C, an outer edge of the outer peripheral wall 82 of the stopper 80 is provided with an edge portion 82a that protrudes outward, and is temporarily caught on the inner edge portion of the upper surface of the expansion / contraction ring 60. ing. However, when the stopper 80 is moved, it is slid out by the C surface 60a formed on the inner edge.

Next, an assembled state of the corrugated pipe joint 1 in which the above-described parts are incorporated will be described with reference to FIG.
As shown in FIG. 2, the stopper 80, the expansion / contraction ring 60, the airtight packing 31, the fireproof packing 35, the retainer holder 70, and the retainer 40 are arranged in the axial direction in the innermost portion of the inner hole 11 of the joint body 10. Are arranged side by side.

  The upper portion of the outer peripheral surface of the outer peripheral wall 82 of the stopper 80 is fitted inside the expansion / contraction ring 60, and the edge portion 82 a of the stopper 80 is locked to the inner edge portion 60 a of the upper surface of the ring 60. The outer edge portion of the lower surface 60b of the expansion / contraction ring 60 is pressed against the expansion / contraction ring engagement first step portion 22p. The small diameter portion 31 b of the airtight packing 31 is fitted inside the outer peripheral wall 82 of the stopper 80, and the lower surface of the large diameter portion 31 a of the packing 31 is pressed against the top of the outer peripheral wall 82 of the stopper 80. The lower surface of the base portion 73 of the retainer holder 70 is pressed against the upper surface of the large-diameter portion 31 a of the hermetic packing 31. The fireproof packing 35 is fitted into the lower outer periphery of the stopper ring 71 of the retainer holder 70, and the claws 43 of the retainer 40 are pressed against the upper outer periphery of each stopper ring 71 to expand the diameter of the retainer 40. In this expanded diameter state, the corrugated tube T (see FIG. 3) can be passed through the inner peripheral region surrounded by the claws 43 without resistance.

  Since the outer peripheral portion of the lower end tapered surface 45b of each claw 43 of the retainer 40 is in a position where it comes into contact with the retainer claw engagement stepped portion end surface 22m, the retainer pushing sleeve 50 can be moved to the inner side of the joint body 10 even if it is moved. The claw 43 cannot be moved by pressing against the outer peripheral tapered surface 47a. The retainer pushing sleeve 50 is not accidentally slid before the corrugated tube T is inserted. Accordingly, it is not necessary to attach a positioning collar to the cylindrical insertion portion 53 of the retainer pushing sleeve 50 as in the prior art. However, if the positioning collar is attached to the cylindrical insertion portion 53 of the retainer push sleeve 50, the retainer push sleeve 50 may be damaged by the retainer 40 when it is accidentally dropped during transportation and storage of the insertion joint 1. For example, it can be prevented that the joint body 10 is pushed into the joint body 10.

  An O-ring R1 is fitted in an O-ring groove 53j on the outer periphery of the cylindrical insertion portion 53 of the retainer pushing sleeve 50. Further, the stop ring groove 53k of the retainer pushing sleeve 50 is in a state facing the ring groove 22j on the inner periphery of the joint body 10, and the stop ring R2 is fitted in these grooves 53k, 22j.

  Next, the effect | action and usage method of the corrugated pipe joint 1 which has the said structure are demonstrated mainly based on FIGS. 3-6 and FIG.

  First, as shown in FIG. 3, the corrugated pipe T is inserted into the joint body 10 through the inner hole of the retainer pushing sleeve 50. At this time, the tip of the corrugated tube T passes through the water-tight packing 55, the cylindrical insertion portion 53, the retainer 40, the retainer holder 70, and the air-tight packing 31 in the sleeve 50, and hits the bottom surface 81 of the stopper 80. .

  When the tip of the corrugated tube T passes through the inner hole 31h of the airtight packing 31, the outer peripheral surface of the corrugated tube T and the inner peripheral surface of the packing 31 slide against each other. (Force in the inner hole depth direction) is applied. However, since the back end surface 31d of the packing 31 is in contact with the expansion / contraction ring 60 located on the far side of the packing 31 and the movement is restricted, it does not move toward the far side.

  Next, as shown in FIG. 4, when the corrugated tube T is further pushed in, the stopper 80 that is in contact with the tip of the corrugated tube T slightly expands the diameter of the expansion / contraction ring 60 and moves in the inner hole back direction. At this time, since the inner edge portion 60a on the upper surface of the expansion / contraction ring 60 is chamfered, the edge portion 82a of the stopper 80 is smoothly detached from the inner edge portion 60a and slides back. When the stopper 80 is completely removed from the expansion / contraction ring 60 and is located on the deep side of the ring 60, the diameter of the ring 60 that has been expanded by the stopper 80 until then is reduced. At this time, the tip of the corrugated pipe T has reached a position P1 in front of a predetermined position behind the inner hole 11 of the joint body 10.

  Next, as shown in FIG. 5, when the corrugated tube T is further pushed in, the force in the pushing direction (the inner hole depth direction) generated by the sliding of the outer peripheral surface of the corrugated tube T and the inner peripheral surface of the airtight packing 31. Force) is applied to the packing 31. At this stage, since the movement restriction of the airtight packing 31 in the back direction is released, the packing 31 moves toward the back side while pressing the expansion / contraction ring 60 and the stopper 80. The expansion / contraction ring 60 moves from the expansion / contraction ring engagement first step portion 22p to the expansion / contraction ring engagement second step portion 22q. When the expansion / contraction ring 60 reaches the second step portion 22q, the outer peripheral surface of the ring 60 is in contact with the expansion / contraction ring sliding vertical surface 22s, so that the reduced diameter state is maintained. As a result, the expansion / contraction ring 60 pushes the small-diameter portion 31b of the hermetic packing 31 toward the inner diameter side, thereby improving the sealing performance between the inner peripheral surface and the outer peripheral surface of the corrugated tube T.

  At this time, the tip of the corrugated tube T reaches a predetermined position P2 in the back of the inner hole 11 of the joint body 10. On the other hand, since the retainer holder 70 is also pulled and moved with the movement of the airtight packing 31 on the back side, the stopper ring 71 of the holder 70 is also moved to the back and is locked to the ring 71. The claw 43 of the retainer 40 is detached from the same ring 71. Thereby, since the retainer 40 is reduced in diameter by its own elasticity, the outer peripheral portion of the lower end tapered surface 45b of the retainer 40 is disengaged from the retainer claw engagement step portion end surface 22m.

  Next, as shown in FIG. 6, the retainer pushing sleeve 50 is pushed directly into the joint body 10 by hand to the final position (position where the stop ring R2 enters the square groove 22k). When the retainer pushing sleeve 50 is pushed in, the inner circumferential tapered surface 57 at the lower end of the sleeve 50 abuts on the outer circumferential tapered surface 47a of each claw 43 of the retainer 40, and the tapered surface 47a is directed radially inward (reducing diameter direction). Press. Thereby, each nail | claw 43 of the retainer 40 will move to a diameter reduction direction, and each nail | claw 43 will be gradually reduced. And when the inner peripheral taper surface 57 of the retainer pushing sleeve 50 and the outer peripheral taper surface 47a of each claw 43 come into surface contact, the tip of each claw 43 engages with the annular recess of the corrugated tube T, As a result, the end of the corrugated pipe T is fixed in the joint body 10. At the same time, the lower end tapered surface 45 b of each claw 43 of the retainer 40 abuts against the top of the stopper ring 71 of the retainer holder 70 and presses it to the back side, and the airtight packing 31 is sandwiched between the base portion 73 of the holder 70 and the expansion / contraction ring 60. Thus, the sealability between the inner peripheral surface of the large-diameter portion 31a of the packing 31 and the outer peripheral surface of the corrugated pipe T is improved. As described above, the sealing performance of the final airtight packing 31 is sufficiently ensured.

Simultaneously with the pushing of the retainer pushing sleeve 50, the stop ring R2, which has been compressed in the groove 53k, reaches the square groove 22k on the outer periphery of the cylindrical insertion portion 53 of the sleeve 50, and the elasticity of the ring R2 itself is reached. To expand into the square groove 22k. As a result, the retainer pushing sleeve 50 and the joint body 10 are fixed. At this time, the gap d between the retainer pushing sleeve 50 and the joint body 10 shown in FIG. 1 (A) is completely eliminated as shown in FIG. 1 (B), and the outer peripheral surface of the retainer pushing sleeve 50 and the joint body 10. The outer peripheral surface is a continuous surface.
Through the series of operations described above, the corrugated tube T is fixed so as not to be extracted from the joint body 10 by the action of the retainer 40, the retainer pushing sleeve 50, and the stop ring R2.

As described above, according to the corrugated pipe joint 1 of the present embodiment, the end of the corrugated pipe T is inserted into the joint body 10 (see FIGS. 7A, 7B, and 7C). The tip of the corrugated tube T is inserted to a predetermined position P2 at the back of the inner hole 11 of the joint body 10 (see FIG. 7D), and the retainer pushing sleeve 50 is slid in the inner direction at the inner hole 11 of the joint body 10. The corrugated tube T can be reliably connected by a simple operation of pushing the stop ring R2 to the position (final position) where it enters the square groove 22k (see FIG. 7E). And since the front-end | tip of the corrugated pipe T fully enters the airtight packing 31, and the nail | claw 43 of the retainer 40 engages with the annular recessed part of the corrugated pipe T appropriately, a favorable airtight state can be maintained.
In this corrugated pipe joint 1, when the corrugated pipe T is pushed into the joint main body 10, the retainer pushing sleeve 50 cannot be slid in the depth direction unless the tip of the corrugated pipe T reaches the predetermined position P2. It has become. If the corrugated tube T is not inserted in the joint body 10 halfway, the retainer pushing sleeve 50 cannot be pushed into the joint body 10, so that the construction is not completed both from the appearance and work. It becomes clear.

In addition, this invention is applicable not only to a corrugated pipe coupling but a gas stopper. Here, the gas plug is provided with a plug that interconnects the gas pipes and switches the connection state. Hereinafter, an example of a gas stopper will be described.
The gas stopper includes a cylindrical main body made of, for example, brass. Both ends of the main body are connection portions, one of the connection portions is connected to a gas main pipe (or a pipe drawn therefrom), and the opposite connection portion is connected to a gas device. A corrugated tube is connected. A plug body that opens and closes a gas flow path inside the main body is attached to substantially the center in the length direction of the main body.

As an example, the plug body is a columnar member disposed so as to cross the gas flow path, and has a horizontal hole communicating with the gas flow path. Further, the plug is connected to a handle operated by an operator.
The gas stopper configured as described above is operated by turning the stopper by operating the handle, and by aligning the horizontal hole of the stopper with the direction of the gas passage, the gas passage is opened, and the gas main pipe And gas equipment are interconnected.
On the other hand, by turning the plug by operating the handle so that the side hole of the plug does not communicate with the gas flow path, the gas flow path is closed and the connection between the gas main pipe and the gas equipment is cut off. Is done.

  In such a gas stopper, the insertion joint according to the present invention as described in the above embodiment can be integrated into one end and / or both ends of the cylindrical main body. In this case, the cylindrical portion at the end of the main body is the joint main body 10 (see FIG. 2) in the above embodiment. The components (the stopper 80, the expansion / contraction ring 60, the airtight packing 31, the retainer holder 70, the retainer 40, and the retainer pushing sleeve 50) disposed therein can be the same as in the above embodiment. According to the gas stopper configured as described above, the connection is completed just by inserting the corrugated pipe T into the main body of the gas stopper as in the above embodiment.

Next, a corrugated pipe joint according to another embodiment of the present invention will be described.
In the corrugated pipe joint 1 of the present invention described above, the end portion of the corrugated pipe T is inserted into the joint main body 10 and the tip of the corrugated pipe T is inserted to the predetermined position P2 at the back of the inner hole 11 of the joint main body 10. The retainer push sleeve 50 is slid in the inner hole 11 of the joint body 10 in the back direction to connect the corrugated tube T. On the other hand, some corrugated pipe joints that are currently used include a type in which the corrugated pipe is connected to the joint body by inserting the corrugated pipe until a click feeling is obtained and then pulling it forward. When an installer accustomed to using this type of joint uses a joint that does not pull forward as in the present invention, it may accidentally be pulled forward before inserting the corrugated pipe all the way. sell. In this case, the following problems may occur.

FIGS. 19-24 is a longitudinal cross-sectional view for demonstrating the example of a connection failure of a corrugated pipe joint. Some of the components of the corrugated pipe joint shown in these drawings have the same operation and configuration although the structures thereof are slightly different from those of the corrugated pipe joint shown in FIG.
First, the formal construction method will be briefly explained. From the initial state shown in FIG. 19A, as shown in FIG. 19B, the corrugated pipe T is inserted into the joint body 10 through the inner hole of the retainer pushing sleeve 50, and the tip of the corrugated pipe T is used as the stopper 80. Make contact.

  When the corrugated tube T is further inserted, as shown in FIG. 20A, the stopper 80 is pushed by the tip of the corrugated tube T and advances into the inner hole, and as shown in FIG. The expansion / contraction ring engagement is disengaged from the expansion / contraction ring 60 locked to the first step portion 22p, and moves beyond the ring 60 to the far side. Then, as shown in FIG. 21, the diameter of the expansion / contraction ring 60 that has been expanded by the stopper 80 is reduced.

  When the corrugated tube T is further pushed in, as shown in FIG. 22 (A), the friction between the outer peripheral surface of the corrugated tube T and the airtight packing 31 and the stopper 80 pull the airtight packing 31 together with the expansion / contraction ring 60. Move in the back direction. Eventually, the expansion / contraction ring 60 moves until it is locked to the expansion / contraction ring engagement second step 22q, and the tip of the corrugated pipe T reaches the predetermined position P2. At the same time, as the packing 31 moves, the retainer holder 70 is pulled and moved in the back direction, so that the claw 43 of the retainer 40 that is locked to the holder 70 is detached from the retainer holder 70. Finally, as shown in FIG. 22B, the retainer pushing sleeve 50 is pushed toward the joint body 10 to engage each claw 43 of the retainer 40 with the annular recess of the corrugated tube T. As a result, in the normal construction state of this example, the annular convex portions of the three corrugated pipes T are engaged with the packing 31.

  Next, the stopper 80 shown in FIG. 21 is pushed by the tip end of the corrugated tube T and advances to the back of the inner hole, and is disengaged from the expansion / contraction ring 60 locked to the expansion / contraction ring engagement first step portion 22p. A case where the corrugated tube T is pulled by mistake while moving in the back direction will be described. In this state, as described above, the expansion / contraction ring 60 has a reduced diameter. This state in the middle of the construction is a state in which the tip of the corrugated pipe passes through the aforementioned “front position” and reaches the “predetermined position P2”.

  When the corrugated tube T is pulled out after the expansion / contraction ring 60 shown in FIG. 21 is reduced in diameter, the packing 31 is prevented from moving in the pulling direction as shown in FIG. It is slid out of the inner hole and pulled out, and moves away from the stopper 80 (in this example, it is separated from the stopper 80 by one ridge length of the annular convex portion of the tube). The expansion / contraction ring 60 remains reduced in diameter.

  When the corrugated tube T is reinserted in this state (the tip of the corrugated tube T is separated from the stopper 80 by one length of the annular convex portion of the tube), the expansion / contraction ring 60 remains reduced in diameter and the expansion / contraction ring slide Since the moving vertical surface 22s can be moved, the packing 31 can move in the back direction while pressing the expansion / contraction ring 60 and the stopper 80 by friction between the outer peripheral surface of the corrugated tube T and the packing 31 as shown in FIG. The expansion / contraction ring 60 moves until it is locked to the expansion / contraction ring second engagement step 22q. At this time, the stopper 80 has reached the predetermined position P2, but as described above, the tip T1 of the corrugated pipe T is located at a position separated from the stopper 80 by a length corresponding to one mountain of the annular recess of the pipe. The position P2 has not been reached. With the re-insertion of the corrugated tube T, the retainer holder 70 moves in the back direction together with the packing 31, and the holder 70 is detached from the retainer 40. That is, although the tip of the corrugated tube T has not reached the predetermined position P2 at the back of the joint body, the retainer 40 is unlocked and the retainer 40 can move, that is, the retainer pushing sleeve 50 can slide.

  Thereafter, when the retainer pushing sleeve 50 is pushed into the joint body 10, the claws 43 of the retainer 40 engage with the annular recesses of the corrugated pipe T. As a result, in this example, the two annular projections of the corrugated pipe T are engaged with the packing 31. That is, the number of ridges of the corrugated pipe T with which the packing 31 is engaged is smaller than in the normal state.

  Therefore, in the corrugated pipe joint according to the second aspect of the present invention, even if the corrugated pipe T is pulled forward before the insertion is completed, the corrugated pipe joint returns to the initial state and is properly Improved to be connected.

FIG. 25 is a cross-sectional view for explaining the outline of a corrugated pipe joint according to another embodiment of the present invention. FIG. 25 (A) is a diagram showing a state before construction of the joint, and FIG. 25 (B) shows a construction completion state (state in which the corrugated pipe is inserted and connection is completed).
The corrugated pipe joint 201 of this example is characterized by having a trigger 210 that integrates both the expansion / contraction ring 60 and the stopper 80 in the corrugated pipe joint of the first embodiment shown in FIG. . Even if the corrugated tube T is pulled before the insertion is completed by the trigger 210, the trigger 210 returns to the initial state and can be properly connected by formal insertion. Since it has such a trigger 210, the corrugated pipe joint 201 of this example differs in the structure of the corrugated pipe joint 1 of FIG. 1 etc., the joint main body 10, and the airtight packing 31. FIG. Furthermore, the difference is that a collar 220 is provided between the retainer pushing sleeve 50 and the upper end of the joint body 10. The other parts have the same configuration and action as the parts of the corrugated pipe joint in FIG. 1, and therefore, the same reference numerals as those in FIG.

First, the structure of the trigger 210 will be described.
26A and 26B are diagrams showing a trigger, FIG. 26A is a perspective view, FIG. 26B is a plan view, and FIG. 26C is a cross-sectional view.
The trigger 210 is an overall ring-shaped member made of an elastically deformable resin (for example, POM). The trigger 210 is provided in an integral manner at the lower end edge of the support portion 211, an annular support portion 211 that is tapered downward, an expansion / contraction ring portion 213 that is integrally provided at the upper edge end of the support portion 211, and the support portion 211. And a stopper portion 215.

The expansion / contraction ring portion 213 includes a plurality (eight in this example) of ring pieces arranged at equal intervals with a slit interposed therebetween in the circumferential direction. As shown in FIG. 26C, each ring piece has a base portion 213a extending upward from the upper end edge of the support portion 211, and a claw portion 213b projecting substantially horizontally from the upper end of the base portion 213a. A hook portion 213c that protrudes inward is provided on the inner diameter portion of the claw portion 213b. Note that the claw portions 213b and the hook portions 213c may not be the same number, and the hook portions c may not be provided in all the claw portions 213b.
The stopper portion 215 includes a plurality (eight in this example) of stopper pieces disposed at the same circumferential position as the ring piece of the expansion / contraction ring portion 213. Each stopper piece protrudes inward from the lower end of the support portion 211. The cross-sectional shape is tapered toward the tip, and the upper surface 215a is substantially horizontal.

  In the free state, the trigger 210 is in a state where the upper surfaces of the expansion / contraction ring portion 213 and the stopper portion 215 are substantially horizontal as shown in FIG. However, since it is made of a material that can be elastically deformed as described above, when a downward force is applied to the upper surface 215a of the stopper portion 215, as shown by an imaginary line in FIG. Each stopper piece 215 is deformed outward, so that the support portion 211 is substantially linear with the base portion 213a of the expansion / contraction ring portion 213. On the other hand, the claw part 213b of the expansion / contraction ring part 213 is deformed inward, that is, in the diameter reducing direction.

Next, differences between the structure of the joint main body and the airtight packing and the respective parts of the corrugated pipe joint of FIG. 1 will be mainly described.
First, the joint body 10 will be described with reference to FIGS.
FIG. 27 is a cross-sectional view showing a single joint body. FIG. 27A is a longitudinal sectional view, and FIG. 27B is a partially enlarged sectional view thereof.
The joint main body 10 is a cylindrical body made of a copper alloy as an example, similarly to the joint main body shown in FIG. 8, and a main body portion 10A having a relatively large outer diameter and a connection having a relatively small outer diameter. Part 10B. The inside of the joint body 10 is an inner hole 11 penetrating vertically. The inner hole 11 is roughly divided into two parts having different inner diameters (from the upper side, the retainer holder etc. accommodating part 25 and the lower inner hole part 29).

  As shown in FIG. 27 (B), an annular ring groove 22j (a rectangular groove 22a having a rectangular cross section and a lower end edge of the rectangular groove 22a are provided on the inner periphery of the retainer holder accommodating portion 25 near the upper end opening. Taper groove 22b formed so as to sag from the bottom to the bottom, annular groove 22k having a rectangular cross section at the back, and retainer engagement having a surface perpendicular to the axis of joint body 10 at the back A step portion 22m is formed.

  Further, in this example, a trigger engagement first step portion 22t having a surface perpendicular to the axis of the joint body 10 is provided at a portion near the lower inner hole portion on the inner periphery of the retainer holder accommodating portion 25 and the like. The trigger engagement second step portion 22v is formed over two steps with the trigger sliding vertical surface 22u interposed therebetween. The 2nd step part 22v is formed in the step further projected inward rather than the 1st step part 22t, and the trigger after movement is pressed. An inner hole portion 22w is formed on the back side of the second step portion 22q. The inner diameter of the inner hole portion 22w is substantially the same as the outer diameter of the base portion 213a of the expansion / contraction ring portion 213 of the trigger 210, and the base portion 213a can slide on the inner hole portion 22w.

Next, the airtight packing 31 will be described with reference to FIG. In this example, the retainer holder 70 is fixed to the hermetic packing 21.
FIG. 28 is a view showing an airtight packing with a retainer holder, in which (A) is a plan view, (B) is a front view, and (C) is a cross-sectional view taken along the line AA in (A).
This airtight packing 31 is a stepped substantially cylindrical member having a relatively thick thickness, similar to the airtight packing shown in FIG. 14, and is made of NBR (nitrile rubber) as an example. The airtight packing 31 has a thick portion 31a having a relatively large outer diameter and a thin portion 31b having a relatively small outer diameter, and an inner hole 31h is formed on the shaft. A retainer holder 70 is fixed to the upper surface of the thick portion 31a by adhesion or the like. In this example, the retainer holder 70 has a stopper ring 71 that is not composed of a plurality of rising pieces 71a as shown in FIGS. 12 and 13, for example, a single cylindrical shape. It may be a thing. The outer diameter of the thin portion 31b is substantially equal to the inner diameter of the expansion / contraction ring of the trigger 210. The vicinity of the inlet of the inner hole 31h is chamfered to facilitate the insertion of the corrugated tube T (C surface 31c).

  In this example, a groove 31 d extending in the circumferential direction is formed at the boundary between the thick portion 31 a and the thin portion 31 b on the outer peripheral surface of the hermetic packing 31. As will be described in detail later, the catch portion 213c of the expansion / contraction ring portion 213 of the trigger 210 is fitted into the groove 31d. The width of the groove 31d is slightly shorter than the thickness of the catch portion 213c. Further, a protruding portion 31e extending in the circumferential direction is formed on the inner peripheral surface of the airtight packing 31 at substantially the same height as the groove 31d.

Next, an assembled state (before the corrugated pipe is inserted) of the corrugated pipe joint 1 in which the above-described parts are incorporated will be described with reference to FIG.
In the initial state, the thin portion 31 b of the airtight packing 31 is fitted in the trigger 210. That is, the lower surface of the thick portion 31 a of the airtight packing 31 is on the upper surface of the expansion / contraction ring portion 213 of the trigger 210. The catch portion 213c of each ring piece 213 does not completely enter the circumferential groove 31d. The expansion / contraction ring portion 213 of the trigger 210 is locked to the trigger engagement first step portion 22 t of the joint body 10.

  A collar 220 is detachably mounted between the retainer pushing sleeve 50 and the joint body 10. The collar 220 is a C-shaped ring-shaped member, and when the collar 220 is removed, the retainer pushing sleeve 50 can be slid in the depth direction of the joint body 10.

Next, the operation and method of use of the corrugated pipe joint 1 having the above configuration will be described mainly based on FIGS. 29 to 33.
First, in the initial state shown in FIG. 29, as described above, the lower surface of the thick portion 31 a of the airtight packing 31 is on the upper surface of the expansion / contraction ring portion 213 of the trigger 210. As shown in an enlarged view in FIG. 29B, the catch portion 213c of each ring piece 213 does not completely enter the circumferential groove 31d. The expansion / contraction ring portion 213 of the trigger 210 is locked to the trigger engagement first step portion 22 t of the joint body 10. The corrugated tube T is inserted into the joint body 10 through the inner hole of the retainer pushing sleeve 50, and the tip of the corrugated tube T abuts against the upper surface 215 a of the stopper portion 215 of the trigger 210.

  Next, as shown in FIG. 30, when the corrugated tube T is further pushed in, the stopper portion 215 that is in contact with the tip of the corrugated tube T is pushed in the back direction. Accordingly, as shown in an enlarged view in FIG. 29B, the stopper portion 215 is deformed so as to rotate outward and downward with respect to the support portion 211, so that the support portion 211 is a base portion of the expansion / contraction ring portion 213. While being substantially linear with 213a, the expansion / contraction ring portion 213 is deformed inward, that is, in the diameter-reducing direction. Then, each catching part 213 c of the expansion / contraction ring part 213 bites into the groove 31 c of the airtight packing 31. Since the width of the groove 31c is slightly shorter than the thickness of the catch portion 213c, both are closely connected. At the same time, the expansion / contraction ring portion 213 is disengaged from the expansion / contraction ring engagement first step portion 22t of the joint body 10, and the trigger 210 is movable in the back direction.

  Furthermore, as shown in FIG. 31, when the corrugated pipe T is further pushed in, the trigger 210 moves in the back direction with the stopper portion 215 being pushed at the tip of the corrugated pipe T. At that time, as shown in FIG. 31 (B), the outer peripheral surface of the expansion / contraction ring portion 213 abuts on the vertical sliding portion 22u of the joint body 10 to maintain the reduced diameter state, and the hook portion 213c is a groove of the airtight packing 31 Since the gas tight packing 31 is biting into 31c, the airtight packing 31 is pulled by the trigger 210 and moves in the back direction. During this movement, each claw 43 of the retainer 40 is locked to the retainer holder 70.

  Here, the diameter of the expansion / contraction ring portion 213 of the trigger 210 is reduced, and the hook portion 213c tightly bites into the groove 31c of the airtight packing 31, so that the friction between the packing 31 and the outer peripheral surface of the corrugated pipe T is increased. Yes. In addition, since the protrusion part 31e was provided in the inner peripheral surface of the packing 31, the frictional force is further increased. For this reason, when the corrugated tube T is accidentally pulled during the movement, the airtight packing 31 is also caused by friction between the outer peripheral surface of the corrugated tube T and the airtight packing 31 as shown in FIG. At the same time, the trigger 210 that moves forward and bites into the packing 31 also moves forward. When the corrugated tube T is further pulled and the expansion / contraction ring portion 213 of the trigger 210 exceeds the trigger engagement first step portion 22t of the joint body 10 as shown in FIG. 32 (B), the outer surface of the expansion / contraction ring portion 213 Since there is a gap between the inner hole of the joint body 10, the expansion / contraction ring portion 213 is deformed outward, that is, in the diameter expansion direction. That is, the expansion / contraction ring portion 213 returns to the initial state shown in FIG. 29 where the expansion / contraction ring engagement first step portion 22t of the joint body 10 is locked. That is, the tip of the corrugated tube T is not separated from the stopper portion 215 of the trigger 210, and the number of the annular convex portions of the corrugated tube T that mesh with the packing 31 (three in this example) does not change.

  As described above, the circumferential protrusion 31d is formed on the surface (inner peripheral surface) opposite to the groove 31c of the hermetic packing 31, and the thickness of the packing 31 is not reduced even in the groove 31c. Has been. Thereby, when the trigger 210 deform | transforms inward, the compression force of the packing 31 between the expansion / contraction ring part 213 and the outer peripheral surface of the corrugated pipe T becomes large, and the expansion / contraction ring part 213 is an outward direction (diameter expansion direction). The expansion / contraction ring portion 213c that has entered the groove 31c when deformed into the shape easily returns to the original state.

  The corrugated tube T is then reinserted in a formal manner. Then, the trigger 210 is pushed in together with the corrugated tube T from the state shown in FIG. 31, and the expansion / contraction ring portion 213 of the trigger 210 is moved to the trigger engagement second step portion 22v of the joint body 10 as shown in FIG. The tip of the corrugated tube T reaches a predetermined position P2 at the back of the inner hole of the joint body 10. At the same time, the retainer holder 70 moves in the back direction, and each claw 43 of the retainer 40 is detached from the retainer holder 70.

  If the corrugated tube T is accidentally pulled out in this state (a state where the corrugated tube T is completely inserted), the airtight packing 31, the retainer holder 70 and the trigger 210 are caused by friction between the outer peripheral surface of the corrugated tube T and the airtight packing 31. Is also pulled forward together with the corrugated tube T. When the corrugated tube T is further pulled, the stopper ring tip 71a of the retainer holder 70 hits the claw portion 43 of the retainer 40 and pushes it up. Then, the claw portion 43 is deformed inward, that is, has a reduced diameter, and meshes with the annular recess of the corrugated tube T.

  When the corrugated tube T is further pulled out, the retainer 40 meshing with the tube T also moves forward. Then, as shown in FIG. 33 (B), the outer peripheral tapered surface of the retainer 40 eventually comes into contact with the inner peripheral tapered surface of the lower end of the retainer pushing sleeve 50. Then, each claw 43 of the retainer 40 moves in the diameter reducing direction, and the tip of each claw 43 is reliably engaged by the annular recess of the corrugated tube T. Thereby, while the edge part of the corrugated pipe T is fixed in the joint main body 10, the movement of the retainer 40, ie, extraction of the corrugated pipe T, becomes impossible.

  Finally, the collar 220 is removed, and as shown in FIG. 33C, the retainer pushing sleeve 50 is directly pushed by hand into the joint body 10 to the final position (position where the stop ring R2 enters the square groove 22k). .

  As can be seen from the above description, the corrugated pipe joint 1 returns to the initial state when the corrugated pipe T is pushed into the joint main body 10 and is accidentally pulled. For this reason, if it inserts in a formal state after that, it can connect normally.

Next, another example using the above-described trigger 210 will be described.
FIG. 34 is a cross-sectional view for explaining an outline of a corrugated pipe joint according to another embodiment of the present invention. FIG. 34 (A) is a view showing a state before the joint is constructed, and FIG. The construction completion state of the joint (a state where the corrugated pipe is inserted and the connection is completed) is shown.
The corrugated pipe joint 301 of this example is different in the structure of the retainer holder 70 of the corrugated pipe joint 201 shown in FIG. Furthermore, the structure of the joint body 10 is partially different. The other parts have the same configuration and action as the parts of the corrugated pipe joint in FIG. 1, and therefore, the same reference numerals as those in FIG.

First, the structure of the retainer holder 70 will be described.
FIG. 35 is a view showing a retainer holder, FIG. 35 (A) is a perspective view, FIG. 35 (B) is a plan view, FIG. 35 (C) is a sectional view, and FIG. 35 (D) is another example of a retainer holder. FIG.
The retainer holder 70 shown in FIGS. 35A to 35C has a base portion 73 and a stopper ring 71 as in the case shown in FIGS. 12 and 13, but the stopper ring 71 is cylindrical. It is configured. Further, the tip edge 71b of the stopper ring 71 extends outward at an angle of about 45 °.
In the retainer holder 70, as shown in FIG. 35D, only the outer peripheral surface of the tip 71c of the stopper ring 71 extends outward, and the inner peripheral surface may have the same inner diameter.

Next, the differences of the joint body 10 will be described.
As shown in FIG. 34, the outer surface 22x (the inner peripheral surface on the front side of the retainer engagement step portion 22m) of the retainer 40 in the inner periphery of the retainer holder or the like of the joint body 10 is shown in FIG. The corrugated pipe joint 201 has a larger diameter than that of the joint body 10. That is, in the state before the corrugated pipe is inserted, the clearance between the outer peripheral surface of the retainer 40 and the inner peripheral surface of the joint body 10 is wider than that of the corrugated pipe joint shown in FIG.

Next, the operation and method of use of the corrugated pipe joint 1 having the above configuration will be described mainly based on FIGS.
First, the insertion of the corrugated tube T shown in FIGS. 36 (A) and 36 (B) is the same as the insertion of the corrugated tube T shown in FIGS. 29 and 30. That is, as shown in FIG. 36A, the corrugated tube T is inserted into the joint body 10 through the inner hole of the retainer pushing sleeve 50 and the tip is abutted against the stopper portion 215 of the trigger 210. When the corrugated tube T is further inserted, the trigger 210 is deformed as described above and the trigger 210 and the packing 31 are connected as shown in FIG. Furthermore, the expansion / contraction ring portion 213 of the trigger 210 is disengaged from the expansion / contraction ring engagement first step portion 22t of the joint body 10, and the trigger 210 can move in the back direction.

  Also, in the case where the corrugated tube T is accidentally pulled while moving as shown in FIGS. 37A, 37B, and 37C, FIGS. 32A and 32B are used. The operation is the same as that shown in. That is, as shown in FIG. 37 (A), when the corrugated tube T is pulled forward, the packing 31 and the trigger 210 are also pulled forward together with the tube T. 37 (B), when the expansion / contraction ring portion 213 of the trigger 210 exceeds the trigger engagement first step portion 22t of the joint body 10, as shown in FIG. 37 (C), the expansion / contraction ring portion 213 Expands and returns to the initial state position shown in FIG.

The corrugated tube T is then reinserted in a formal manner. Then, as shown in FIG. 38A, the trigger 210, the packing 31, and the retainer holder 70 move in the back direction together with the corrugated pipe T, and the claws 43 of the retainer 40 are detached from the retainer holder 70. At this time, the tips of the claws 43 of the retainer 40 are reduced in diameter after being expanded along the outer peripheral surface of the stopper ring 71 of the retainer holder 70. In this example, as shown in FIGS. 35C and 35D, the stopper ring 71 has the tips 71b and 71c extending outward, so that the diameter of the claw 43 increases. In addition, since the clearance is added to the inner peripheral surface 22x of the joint body 10, the claw 43 can be completely expanded in diameter.
Thereafter, when the corrugated tube T is inserted until the expansion / contraction ring portion 213 of the trigger 210 hits the trigger engagement second step portion 22v, the tip of the corrugated tube T reaches the predetermined position P2.

  If the corrugated tube T is accidentally pulled out in this state (a state where the corrugated tube T is completely inserted), the airtight packing 31, the retainer holder 70 and the trigger 210 are caused by friction between the outer peripheral surface of the corrugated tube T and the airtight packing 31. Is also pulled forward together with the corrugated tube T. When the corrugated tube T is further pulled, the stopper ring tip 71a of the retainer holder 70 hits the claw portion 43 of the retainer 40 and pushes it up. At this time, since the stopper ring tip 71b of the retainer holder 70 of this example extends outward and is larger in diameter than the outer diameter of the stopper ring 71, the retainer holder 70 is surely brought into contact with the lower surface of the claw portion 43 and has a claw portion. 43 can be pushed up. Further, the retainer is hardly elastically deformed due to secular change, and even when the retainer 40 is detached from the retainer holder 70, the retainer 40 does not sufficiently contract the diameter, and the inner diameter of the claw portion 43 is the outer diameter of the stopper ring 71 of the retainer holder 70. The stopper ring tip 71b (71c) of the retainer holder 70 has a large outer diameter even in the case that the retainer holder 70 has a similar outer diameter. Can be pushed up.

  When the corrugated tube T is further pulled out, the retainer 40 meshing with the tube T also moves forward. Then, as shown in FIG. 38 (B), the outer peripheral tapered surface of the retainer 40 eventually comes into contact with the inner peripheral tapered surface of the lower end of the retainer pushing sleeve 50, and the retainer 40 cannot move. That is, the corrugated tube T cannot be pulled out.

  Thereafter, as shown in FIG. 38C, the collar 220 is removed, and the retainer pushing sleeve 50 is directly pushed by hand into the joint body 10 to the final position (position where the stop ring R2 enters the square groove 22k). As a result, the retainer 40 and the corrugated tube T meshing with the retainer 40 are pushed in, and the tip of the tube reaches the predetermined position P2.

39 is a view showing a modification of the corrugated pipe joint of FIG. 34, FIG. 39 (A) is a view showing a state before construction of the joint, and FIG. 39 (B) is a construction completion state of the joint. (The state in which the corrugated tube is inserted and the connection is completed).
The corrugated pipe joint 401 of this example is different from the corrugated pipe joint of FIG. 34 in that a backup rubber (elastic material) 410 is disposed between the retainer 40 and the joint body inner peripheral surface 22x outside the retainer 40. And the trigger engagement 1st step part 22t is not provided in the coupling main body 10.

  The backup rubber 410 is, for example, an NBR O-ring. The backup rubber 410 provides resistance when the retainer 40 is expanded in diameter.

  In addition, the joint main body 10 is not provided with the first trigger engagement step portion, and in the initial state shown in FIG. 39A, the trigger 210 has the catch portion 213 c engaged with the groove 31 d of the packing 31.

Next, the operation and usage of the corrugated pipe joint 401 having the above configuration will be described with reference to FIGS. 40 and 41. FIG.
First, in the initial state shown in FIG. 40 (A), the corrugated pipe T is inserted into the joint body 10 through the inner hole of the retainer pushing sleeve 50, and the tip of the corrugated pipe T is pushed against the stopper 215 of the trigger 210. . Then, as shown in FIG. 40B, due to the friction between the outer peripheral surface of the corrugated pipe T and the airtight packing 31, the airtight packing 31 and the retainer holder 40 move in the back direction together with the corrugated pipe T, and the trigger 210 is also packed 31. Press to move backward.

Further, the insertion of the corrugated tube T causes each of the claws 43 of the retainer 40 to come off from the retainer holder 70. At this time, the tips of the claws 43 of the retainer 40 expand in diameter along the outer peripheral surface of the stopper ring 71 of the retainer holder 70 as described above, but the backup rubber 410 is disposed on the outer periphery of the retainer 40. Therefore, resistance is applied from the backup rubber 410 during diameter expansion. That is, when removing the retainer holder 70 from the retainer 40, it is necessary to push the corrugated pipe T with a strong force. Thereby, the front-end | tip of the corrugated pipe | tube T can fully enter the packing 31. FIG.
Thereafter, as shown in FIG. 40C, the corrugated tube T is inserted until the expansion / contraction ring portion 312 of the trigger 210 hits the trigger engagement second step portion 22v.

In this example, the joint main body 10 is not provided with the step portion 22t for locking the trigger 210. This is due to the following reason.
When the backup rubber 410 is not disposed, the trigger 210 is locked to the step portion 22t of the joint body 10 until the tip of the corrugated tube T abuts against the stopper portion 215 of the trigger 210, and the trigger 210 and the packing 31 move in the back direction. Not to be. On the other hand, when the backup rubber 410 is disposed outside the outer peripheral surface of the retainer 40, resistance is given to the diameter expansion of the claw portion 43 of the retainer 40 when the corrugated tube T is inserted, and the claw portion 43 is difficult to expand. That is, it becomes difficult for the retainer holder 70 to be detached from the retainer 40. For this reason, the retainer holder 70 is difficult to move in the back direction, and the packing 31 to which the retainer holder 70 is fixed and the trigger 210 engaged with the packing 31 are also prevented from moving in the back direction. For this reason, it is not necessary to provide the step part 22t which latches the trigger 210. FIG.

  When the corrugated tube T is accidentally pulled out in this state (a state where the corrugated tube is completely inserted), the airtight packing 31 is caused by friction between the outer peripheral surface of the corrugated tube T and the airtight packing 31 as described in FIG. The retainer holder 70 and the trigger 210 also move forward together with the corrugated tube T, and the stopper ring tip 71a of the retainer holder 70 hits the claw portion 43 of the retainer 40 to push up the claw portion 43. Then, as shown in FIG. 41 (A), the diameter of the claw portion 43 is reduced to engage with the annular recess of the corrugated tube T, and the outer peripheral tapered surface of the retainer 40 abuts against the inner peripheral tapered surface of the lower end of the retainer pushing sleeve 50. The retainer 40 cannot be moved.

  Thereafter, as shown in FIG. 41 (B), the collar 220 is removed, and the retainer pushing sleeve 50 is pushed directly into the joint body 10 by hand to the final position. As a result, the retainer 40 and the corrugated tube T meshing with the retainer 40 are pushed in, and the tip of the tube reaches the predetermined position P2.

It is a figure explaining the outline | summary of the corrugated pipe coupling of one form of this invention, (A) is an external appearance perspective view which shows the initial state of the joint, (B) is the final state (corrugated pipe | tube inserted) of the joint. FIG. It is a figure (initial state) of the corrugated pipe joint of FIG. 1, (A) is whole sectional drawing, (B) is the partially expanded sectional view. It is a figure for demonstrating operation | movement of the corrugated pipe coupling of FIG. 1, (A) is whole sectional drawing, (B) is the partially expanded sectional view. It is a figure for demonstrating operation | movement of the corrugated pipe coupling of FIG. 1, (A) is whole sectional drawing, (B) is the partially expanded sectional view. It is a figure for demonstrating operation | movement of the corrugated pipe coupling of FIG. 1, (A) is whole sectional drawing, (B) is the partially expanded sectional view. It is a figure (construction completion state) for demonstrating the operation | movement of the corrugated pipe joint of FIG. 1, (A) is sectional drawing of the whole, (B) is the partially expanded sectional view. 7 is a drawing in which FIGS. 2A to 6A are combined into one sheet. FIG. It is a figure of a joint main body simple substance, (A) is a longitudinal section, and (B) is the partially expanded sectional view. It is a longitudinal cross-sectional view of a retainer pushing sleeve alone. It is a perspective view which shows the external appearance of a retainer single-piece | unit. It is a figure which shows the retainer of FIG. 10, (A) is a top view, (B) is a partial cross section front view, (C) is an expanded sectional view which expands and shows the A section of (B). is there. It is an external appearance perspective view of a retainer holder. It is a figure which shows the retainer holder of FIG. 12, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A). It is a figure which shows an airtight packing single-piece | unit, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A). It is a figure which shows the external appearance of an expansion / contraction ring single-piece | unit, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A). It is a figure which shows a stopper single-piece | unit, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A). It is a schematic diagram for demonstrating the use of the gas pipe and the insertion joint relevant to this invention. It is sectional drawing which shows the structure of a corrugated pipe. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is a longitudinal cross-sectional view for demonstrating the example of a connection malfunction of a corrugated pipe joint. It is sectional drawing for demonstrating the outline | summary of the corrugated pipe coupling of the other form of this invention. FIG. 25 (A) is a diagram showing a state before construction of the joint, and FIG. 25 (B) shows a construction completion state (state in which the corrugated pipe is inserted and connection is completed). It is a figure which shows a trigger, FIG. 26 (A) is a perspective view, FIG.26 (B) is a top view, FIG.26 (C) is sectional drawing. It is sectional drawing which shows a coupling main body single-piece | unit. FIG. 27A is a longitudinal sectional view, and FIG. 27B is a partially enlarged sectional view thereof. It is a figure which shows the airtight packing with a retainer holder, (A) is a top view, (B) is a front view, (C) is sectional drawing in the AA cut line of (A). It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is sectional drawing for demonstrating the outline | summary of the corrugated pipe coupling of the other form of this invention, FIG.34 (A) is a figure which shows the state before construction of the joint, FIG.34 (B) is construction of the joint The completed state (state in which the corrugated tube is inserted and the connection is completed) is shown. FIG. 35A is a perspective view, FIG. 35B is a plan view, FIG. 35C is a cross-sectional view, and FIG. 35D is a cross-sectional view of another example of the retainer holder. is there. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure which shows the modification of the corrugated pipe joint of FIG. 34, FIG. 39 (A) is a figure which shows the state before construction of the joint, FIG. 39 (B) is the construction completion state (corrugated pipe of the joint) The connection is completed after being inserted). It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG. It is a figure explaining the effect | action and usage method of the corrugated pipe joint of FIG.

Explanation of symbols

1, 201, 301, 401 ... plug-in joint, 2a ... flexible pipe, 2b ... covered tube, 10 ... joint body, 10A ... body part, 10B ... connection part, 10t ..Tool engaging portion, 11... Inner hole, 22a... Square groove, 22b... Tapered groove, 22j... Ring groove, 22k ... Square groove, 22m. Part, 22p: expansion / contraction ring engagement first step, 22q: expansion / contraction ring engagement second step, 22r: expansion / contraction ring sliding taper surface, 22s ... expansion / contraction ring sliding vertical surface, 22t: trigger engaging first step portion, 22v: trigger engaging second step portion, 22u: trigger sliding vertical surface, 22w: inner hole portion, 22x: inner peripheral surface, 25... Retainer holder accommodating portion, 31... Airtight packing, 31 c. ... Groove, 31e ... Projection, 35 ... Fireproof packing, 40 ... Retainer, 42 ... Ring support, 43 ... Nail, 43a ... Slit, 45 ... Claw member, 45b ... tapered surface, 47 ... base, 47a ... peripheral tapered surface, 50 ... retainer pushing sleeve, 51 ... large diameter part, 51a ... packing groove, 53 ...・ Cylindrical insertion part, 53h ... through hole, 53j ... O-ring groove, 53k ... stop ring groove, 53m ... traction member engaging groove, 55 ... watertight packing, 57 ... Inner circumferential taper surface, 59 ... vent member, 60 ... expansion / contraction ring, 60a ... C surface, 60b ... lower surface, 61 ... split, 62 ... notch, 70 ... retainer Holder, 71 ... Stopper ring, 71a ... Rising piece, 71b, 71c -Tip, 73 ... Base part, 80 ... Stopper, 81 ... Bottom, 81a ... Hole, 82 ... Outer peripheral wall 82a ... Edge part, R1 ... O-ring, R2 .... Stop ring, T ... Corrugated tube 210 ... Trigger, 211 ... Supporting part, 213 ... Expansion / contraction ring part, 213a ... Base part, 213b ... Claw part, 213c ... Hook Part, 215 ... stopper part, 215a ... upper surface, 220 ... collar, 410 ... backup rubber

Claims (16)

A cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted;
An airtight packing disposed in the inner hole of the joint body and in close contact with the outer peripheral surface of the corrugated pipe;
A retainer disposed in the joint body inner hole, having a claw capable of expanding and contracting and engaging with an annular recess of the corrugated pipe when the diameter is reduced;
A corrugated pipe joint comprising: a retainer pushing sleeve that slides in the back direction in the joint body inner hole and pushes the retainer to reduce the diameter, whereby the retainer claw engages with the annular recess of the corrugated pipe. And
further,
As long as the tip of the corrugated tube does not reach a predetermined position in the inner hole of the joint main body, the retainer is engaged with the claw of the retainer to maintain the diameter of the retainer, and the tip of the corrugated tube is kept in the predetermined position. A retainer holder that is disengaged from the retainer claw and allows the retainer to be reduced in diameter when inserted to a position;
As long as the tip of the corrugated tube does not reach the predetermined position, the retainer having the claw engaged with the retainer holder is prevented from moving in the back direction, and thereby the back of the retainer pushing sleeve is prevented. The retainer having the claw disengaged from the retainer holder can be moved in the back direction when the corrugated tube is inserted to the predetermined position. And means for enabling the retainer pushing sleeve to slide in the back direction,
The retainer holder has a rising portion that abuts against the inside of the retainer claw and maintains the retainer in an expanded state;
As a means for preventing the retainer pushing sleeve from sliding, a retainer engaging step portion that engages with the outer periphery of the retainer in an expanded state is provided in the joint body inner hole,
As long as the tip of the corrugated tube does not reach the position in front of the predetermined position behind the inner hole of the joint body (front position), the diameter of the retainer holder is increased in the direction toward the inner hole of the joint body. An expansion / contraction ring is provided, which prevents movement and is reduced in diameter when the end of the corrugated tube is inserted to the front position so that the retainer holder can move in the back direction. Turkey Rugate fitting. When the expansion / contraction ring is in a diameter-expanded state, it is engaged with an expansion / contraction ring engagement step provided in the joint body inner hole, and when the expansion / contraction ring is in a diameter-reduced state, the expansion / contraction ring engagement step. The corrugated pipe joint according to claim 1 , wherein the corrugated pipe joint moves away from the portion and moves in the back direction. As long as the tip of the corrugated tube does not reach the front position, the diameter of the ring is maintained in contact with the inner peripheral surface of the expansion / contraction ring, and the tip of the corrugated tube is inserted to the front position. The corrugated pipe joint according to claim 1 or 2 , further comprising a stopper that is removed from an inner peripheral surface of the expansion / contraction ring in association with the insertion and enables the diameter of the ring to be reduced. A cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted;
An airtight packing disposed in the inner hole of the joint body and in close contact with the outer peripheral surface of the corrugated pipe;
A retainer disposed in the joint body inner hole, having a claw capable of expanding and contracting and engaging with an annular recess of the corrugated pipe when the diameter is reduced;
A retainer pushing sleeve that slides in the interior direction in the inner hole of the joint body and pushes the retainer to reduce the diameter thereof, whereby the claw of the retainer engages with the annular recess of the corrugated pipe,
Further, the corrugated pipe disposed on the outer periphery of the hermetic packing is in a diameter-expanded state until the tip of the corrugated pipe does not reach the inner hole of the joint body, and contracts when the tip of the corrugated pipe is inserted to the back. A corrugated pipe joint comprising an expansion / contraction ring that is in a diameter state and tightens the outer peripheral face of the hermetic packing and presses the inner peripheral face of the packing against the outer peripheral face of the corrugated pipe. The expanded / contracted ring is moved to a portion having a diameter smaller than the diameter of the expanded ring provided on the inner side of the joint body inner hole after the diameter reduction is enabled, and the reduced diameter state is maintained. 5. The corrugated pipe joint according to claim 4 , wherein the inner peripheral surface of the hermetic packing is pressed against the outer peripheral surface of the corrugated pipe. Further, as long as the tip of the corrugated tube does not reach the predetermined position, the retainer engages with the claw of the retainer to maintain the diameter of the retainer, and the tip of the corrugated tube is inserted to the predetermined position. A retainer holder that disengages the retainer claw and enables the retainer to have a reduced diameter;
The hermetic packing is disposed at the back side of the retainer holder in the joint body inner hole, and when the retainer pushing sleeve is pushed in the back direction, the retainer is pushed and moved in the back direction. , whereby in the holder is pushed into the depth direction, characterized in that said packing is compressed, the corrugated tube joint according to claim 4 or 5. A cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted;
An airtight packing disposed in the inner hole of the joint body and in close contact with the outer peripheral surface of the corrugated pipe;
A retainer disposed in the joint body inner hole, having a claw capable of expanding and contracting and engaging with an annular recess of the corrugated pipe when the diameter is reduced;
A retainer pushing sleeve that slides in the inner direction in the joint body inner hole and pushes the retainer to reduce the diameter, whereby the claw of the retainer engages with the annular recess of the corrugated pipe;
As long as the tip of the corrugated tube does not reach a predetermined position in the inner hole of the joint main body, the retainer is engaged with the claw of the retainer to maintain the diameter of the retainer, and the tip of the corrugated tube is kept in the predetermined position. A retainer holder that is disengaged from the retainer claw and allows the retainer to be reduced in diameter when inserted to a position;
As long as the tip of the corrugated tube does not reach the predetermined position, the retainer having the claw engaged with the retainer holder is prevented from moving in the back direction, and thereby the back of the retainer pushing sleeve is prevented. The retainer having the claw disengaged from the retainer holder can be moved in the back direction when the corrugated tube is inserted to the predetermined position. And means for enabling the retainer pushing sleeve to slide in the back direction,
The means is
As long as the tip of the corrugated tube does not reach the front position, which is a position before the predetermined position behind the inner hole of the joint body, the diameter of the retainer holder is increased and the retainer holder extends toward the inner direction of the inner hole of the joint body. An expansion / contraction ring portion that prevents movement and is in a reduced diameter state when the tip of the corrugated tube is inserted to the near-end position, allowing the retainer holder to move in the back direction;
It is a stopper portion that is connected to the inner peripheral side of the expansion / contraction ring portion and projects to the joint main body inner hole, and the tip of the corrugated tube abuts at the stage where the tip of the corrugated tube is inserted to the front side position, Accordingly, a stopper portion for reducing the diameter of the expansion / contraction ring portion, and
A hook portion formed on an inner diameter portion of the expansion / contraction ring portion, which engages with an outer peripheral portion of the hermetic packing when the diameter of the expansion / contraction ring portion is reduced, and locks the expansion / contraction ring portion and the airtight packing;
Having a trigger with
When the corrugated tube is pulled back while the distal end of the corrugated tube is in front of the predetermined position after passing the far front position, the trigger returns to the initial state before the corrugated tube is inserted. Characteristic corrugated fitting. The retainer holder has a rising portion that abuts against the inside of the retainer claw and maintains the retainer in an expanded state;
As means for preventing sliding of the retainer push sleeve, the retainer engaging step portion which engages the outer periphery of the retainer of expanded state, characterized in that provided on the joint body hole, claim 7 Corrugated pipe joint described in 1. When the expansion / contraction ring portion is in a diameter-expanded state, it is engaged with an expansion / contraction ring portion engaging step provided in the joint body inner hole, and when the expansion / contraction ring portion is in a diameter-reduced state, the expansion / contraction portion The corrugated pipe joint according to claim 7 , wherein the corrugated pipe joint is disengaged from the ring engagement step portion and moves in the back direction. After the expansion / contraction ring portion can be reduced in diameter, the diameter reduction state is maintained by moving to a portion having a diameter smaller than the diameter of the ring portion in the expanded state provided on the inner side of the joint body inner hole. The corrugated pipe joint according to any one of claims 7 to 9 , characterized in that the inner peripheral surface of the hermetic packing is pressed against the outer peripheral surface of the corrugated pipe. The hermetic packing is disposed at the back side of the retainer holder in the joint body inner hole, and when the retainer pushing sleeve is pushed in the back direction, the retainer is pushed and moved in the back direction. The corrugated pipe joint according to any one of claims 7 to 10 , wherein the packing is compressed by pressing the holder in the back direction. The trigger is made of an elastically deformable material;
A short substantially cylindrical support part, an expansion / contraction ring part integrally provided at the upper edge of the support part, and a stopper part integrally provided at the lower edge of the support part,
The expansion / contraction ring part is a plurality of ring pieces arranged at equal intervals on the upper end edge of the support part with a slit in the circumferential direction, and a hook part projecting inwardly to an inner diameter part of the ring piece Consists of a ring piece with
The stopper portion is a plurality of stopper pieces arranged on the lower end edge of the support portion with a slit at the same circumferential position as the ring piece of the expansion / contraction ring, and extends inwardly from the lower end of the stopper piece. The corrugated pipe joint according to claim 7 , comprising a stopper piece having a bottom portion projecting on the corrugated pipe. When the bottom portion of the stopper portion is pushed by the tip of the corrugated tube, the bottom portion is deformed outward with respect to the support portion, and the expansion / contraction ring portion is deformed inward with respect to the support portion. corrugated tube according to claim 1 2, characterized in that the said catches scaling ring is reduced in diameter to lock the the enlarged reduced ring portion outer peripheral portion engaged with said airtight packing the airtight packing by Fittings. A circumferential groove is formed on the outer peripheral surface of the hermetic packing to engage the catch portion of the trigger,
Corrugated pipe joint according to claim 1 2 or 1 3, characterized in that the circumferential projection is formed at substantially the same height as the inner circumferential surface, said circumferential groove of the packing. The corrugated pipe joint according to claim 7 , wherein an upper edge of the rising portion of the retainer holder extends outward. The corrugated pipe joint according to claim 15 , wherein an elastic material is arranged outside the outer peripheral surface of the retainer in the joint body inner hole.

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