JP5064907B2 - Corrugated fitting - Google Patents

Description

  The present invention relates to a corrugated pipe joint used when a bellows-like corrugated pipe is connected to a steel pipe or the like. In particular, the present invention relates to a corrugated pipe joint that has been improved so that a corrugated pipe deformed flatter than the limit cannot be connected.

FIG. 11 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.

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 sliding the nut member after the corrugated pipe is inserted into the joint body. ing.

JP 2003-176888 A

The corrugated pipe joint of Patent Document 1 described above is excellent enough to meet user needs, but since the packing member abuts on the outer surface of the corrugated pipe and hermetically seals, the corrugated pipe deforms flatter than the limit. If it is, the hermetic sealability may be reduced.
This invention is made | formed in view of the said subject, Comprising: It aims at providing the corrugated pipe joint which added the improvement so that the connection of the corrugated pipe which deform | transformed flat more than the limit cannot be performed.

  In order to achieve the above object, a corrugated pipe joint according to an embodiment of the present invention includes 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 inner hole. A packing that contacts the outer surface of the corrugated pipe, a retainer that is disposed in the inner hole and has a claw that engages with an annular recess of the corrugated pipe, and the corrugated pipe is inserted into the inner peripheral surface. And a cylindrical retainer presser that holds the retainer, and further includes a regulating ring that is disposed at an inner peripheral surface inlet of the retainer presser and has an inner peripheral portion through which the corrugated pipe deformed flatly cannot be inserted. It is characterized by that.

  According to the corrugated pipe joint having such a configuration, when the corrugated pipe is deformed to be flatter than the limit, the corrugated pipe is inserted into the inner hole of the joint body from the inner peripheral surface inlet of the retainer presser. The restriction ring arranged at the inner peripheral surface entrance cannot be inserted. Therefore, airtightness can be sufficiently secured in the construction of corrugated pipe connection.

In the corrugated pipe joint having the above-described configuration, a crack is formed in the restriction ring, and it can be easily detached from the inner peripheral surface entrance of the retainer presser. In addition, the said crack includes both what has made the cut so that it may be easy to split at the time of construction, and what has already broken before construction.
According to such a configuration, once the corrugated pipe having a good shape is inserted from the inner peripheral surface inlet of the retainer presser into the inner hole of the joint body, the used restriction ring can be easily removed from the joint. Can do.

In the corrugated pipe joint according to the above aspect, the restriction ring covers the outer circumferential surface of the retainer presser, and can be expanded along the outer circumferential surface when the ring is split.
According to such a configuration, since the regulating ring is positioned with reference to the retainer presser outer peripheral surface, the corrugated pipe can be smoothly inserted into the joint core.

In the corrugated pipe joint according to the above aspect, the restriction ring is formed with a notch portion and a rupture portion as split portions on the outer peripheral side and the inner peripheral side, respectively, and the width of the rupture portion is the width of the notch portion. Can be larger.
According to such a configuration, when removing the used restriction ring from the retainer presser, the details will be described with reference to FIG. 4, but the split portion is gradually spread along the outer peripheral surface of the sleeve. However, since the broken portion does not contact the corrugated tube at that time, the corrugated tube can be prevented from being damaged.

In the corrugated pipe joint having the above-described configuration, a retaining portion for the regulating ring can be provided on the inner circumferential surface of the regulating ring and the outer circumferential surface of the retainer presser.
According to such a configuration, the regulation ring does not fall off unexpectedly.

In the corrugated pipe joint of the above aspect, the restriction ring has an inner collar portion that engages with the retainer presser inner peripheral surface, and the crack is contracted and closed in a state of being engaged with the inner peripheral surface, The crack can be expanded in a free state.
According to such a configuration, since the regulating ring is positioned with reference to the retainer presser inner peripheral surface, the corrugated pipe can be smoothly inserted into the joint core. Furthermore, the regulating ring can be easily removed from the retainer presser by simply pulling out the used collar portion of the restricting ring from the inner circumferential surface of the retainer presser.

  ADVANTAGE OF THE INVENTION According to this invention, the corrugated pipe which improved can be provided so that the connection of the corrugated pipe deform | transformed flat more than the limit cannot be performed.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the following description, unless otherwise specified, the vertical direction indicates the direction indicated by the arrow in each assembly drawing (FIGS. 1, 3, 5, etc.). The corrugated tube insertion direction is a direction from top to bottom, and the corrugated tube drawing direction is a direction from bottom to top. Further, the front side of the corrugated pipe joint indicates the upper side, and the rear side indicates the lower side.

FIG. 1A is a cross-sectional view showing the overall configuration (pre-construction state) of a corrugated pipe joint according to the first embodiment of the present invention, and FIG. It is.
First, the overall configuration of the corrugated pipe joint will be described with reference to FIG.
The corrugated pipe joint 1 includes the following main parts.
(1) Joint main body 10: It has a cylindrical shape, and has an inner hole 11 into which a corrugated pipe end is inserted, and a connecting portion 13 with other piping members.
(2) Packing 30: It is disposed in the packing inner hole 23 of the inner hole 11 of the joint body 10.
(3) Retainer 40: It is arrange | positioned in the upper inner hole part 21 lower part in the inner hole 11 of the coupling main body 10. FIG.
(4) Retainer presser 50: The retainer presser 50 is slidably attached to the upper side of the joint body 10 and is connected to the joint body 10 by a stop ring 67.
(5) Stopper 70: It is disposed in the upper part of the lower inner hole 25 of the inner hole 11 of the joint body 10.
(6) Restricting ring 90: It is arranged at the inner peripheral surface entrance 56 of the retainer presser 50.

  Although details will be described later, in the corrugated pipe joint 1 of the present embodiment, since the packing 30 abuts on the outer surface of the corrugated pipe and hermetically seals, if the corrugated pipe is deformed flat more than the limit, the hermetic sealability is obtained. May decrease. Therefore, one feature is that a restriction ring 90 that prevents the corrugated pipe deformed flat more than the limit from being inserted and allows only the corrugated pipe having a good shape to pass therethrough is provided.

Details of each part will be described below.
First, the joint body 10 will be described.
The joint body 10 is a cylindrical body made of a copper alloy (an example), and has an inner hole 11 into which a corrugated pipe end is inserted. A connection portion 13 having a smaller outer diameter than other portions is formed on the lower portion of the outer peripheral surface of the joint body 10.

The inner hole 11 of the joint body 10 is a stepped cylindrical hole, and is roughly divided into an upper inner hole portion 21, a packing inner hole portion 23, and a lower inner hole portion 25 in order from the upper side.
The upper inner hole portion 21 of the inner hole 11 has the largest diameter and opens on the upper end side of the joint body 10. A lower side (slide sleeve portion 53) of the retainer presser 50 is slidably fitted in an upper portion of the upper inner hole portion 21, and a retainer 40 is disposed under the sleeve 50. An upper ring groove 22 and a lower ring groove 24 are respectively formed on the inner peripheral surface near the upper end of the upper inner hole portion 21.

  The upper ring groove 22 includes a rectangular groove 22a and a tapered groove 22b formed so as to be tapered downward from the lower end edge of the rectangular groove 22a. A stop ring 67 enters the square groove 22a in the state before construction in FIG. The depth of the square groove 22 a is smaller than the diameter of the core wire of the stop ring 67. On the other hand, the lower ring groove 24 is formed below the tapered groove 22b of the upper ring groove 22, and a small-diameter upper corner groove 24a and a large-diameter lower corner groove 24b are formed in a stepped manner. The stop ring 67 enters the upper corner groove 24a when the corrugated pipe connection is completed (see FIG. 7). A stop ring 67 enters the lower corner groove 24b during disassembly after the corrugated pipe is connected. The depth of the upper corner groove 24 a is smaller than the diameter of the core wire of the stop ring 67, and the depth of the lower corner groove 24 b is larger than the diameter of the core wire of the stop ring 67.

The packing inner hole portion 23 of the inner hole 11 is formed to have a smaller diameter than the upper inner hole portion 21. A packing 30 is disposed in the packing inner hole 23. On the inner peripheral surface of the packing inner hole portion 23, a convex step portion 23a having a claw-like cross section projecting inward is formed.
The lower inner hole portion 25 of the inner hole 11 is formed to have a smaller diameter than the inner hole portion 23 for packing. A stopper 70 is disposed in the lower inner hole portion 25.

Next, the packing 30 will be described.
The packing 30 is disposed in the packing inner hole portion 23 of the inner hole 11 of the joint body 10. The packing 30 includes a ring-shaped airtight packing 31. The airtight packing 31 is made of NBR (nitrile rubber) or the like. The airtight packing 31 tightly seals between the outer peripheral surface of the corrugated tube T and the inner peripheral surface of the packing inner hole portion 23 (see FIGS. 5 to 7). A ring 33 made of brass or the like having an L-shaped cross section is integrally molded at the upper end of the hermetic packing 31. On the ring 33, a ring-shaped fireproof packing 35 is fitted. For example, the fireproof packing 35 is made of a material obtained by mixing NBR with expanded graphite. The fireproof packing 35 expands and deforms when the temperature becomes high during a fire or the like, and tightly seals between the corrugated pipe outer surface and the packing inner hole 23. In the arrangement state of the packing 30, the outer peripheral surface of the airtight packing 31 abuts against the protruding step portion 23 a and is prevented from coming off. At the same time, the movement of the fireproof packing 35 expanded at the time of the fire to the back side is prevented by the contact between the ring 33 and the convex stepped portion 23a, so that the seal surface pressure can be maintained.

Next, the retainer 40 will be described.
The retainer 40 is disposed below the upper inner hole portion 21 in the joint body 10 and is located above the packing 30. The retainer 40 is formed by integrally forming a plastic ring portion 41 and a plurality of (six in this example) claws 43 provided at the lower end edge of the ring portion 41. Each nail | claw 43 is formed in the circumferential direction of the ring part 41 at equal intervals, and the slit 43a exists between each. Each of the claws 43 has an L-shaped cross section and a tip projecting radially inward of the ring portion 41. An outer peripheral tapered surface 47 is formed on the outer side of each claw 43. Each outer peripheral tapered surface 47 is formed so as to sag inwardly toward the ring portion 41 side.

  The retainer 40 is in a state in which each claw 43 is open in the state before construction in FIG. 1, and the circle formed by the tip of each claw 43 is larger than the diameter of the annular convex portion of the corrugated tube. In this state, the corrugated tube can be inserted through the inside of the ring portion 41. When the connection of the corrugated pipe T in FIG. 7 is completed, the outer peripheral taper surface 47 of each claw 43 is pushed inward by an inner peripheral taper surface 57 at the lower end of the retainer presser 50 described later, and the tip of each claw 43 is Squeeze. In this state, each claw 43 fixes the corrugated pipe T to the joint body 10 while holding the annular recess of the corrugated pipe T.

Next, the retainer presser 50 will be described.
The retainer presser 50 is attached to the upper side of the joint body 10. The retainer presser 50 is made of a copper alloy, for example. At the upper end portion of the retainer presser 50, a protruding portion 51 is formed that protrudes to the outer peripheral surface side. The outer diameter of the overhang portion 51 is formed to be approximately equal to the outer diameter of the joint body 10. Below the projecting portion 51 of the retainer retainer 50 is a slide sleeve portion 53 that is slidably fitted into the upper inner hole portion 21 of the joint body 10. A packing groove 54 is dug in the lower part of the inner peripheral surface inlet 56 of the retainer retainer 50 (inner side surface of the overhang portion 51). A watertight packing 55 is fitted in the packing groove 54. This watertight packing 55 seals between the retainer retainer 50 inner surface and the resin coating coated on the outer surface of the corrugated tube T (see FIGS. 5 to 7).

  An inner peripheral tapered surface 57 is formed on the inner peripheral edge at the lower end of the slide sleeve portion 53. The inner peripheral tapered surface 57 is formed so as to sag inward from the lower end of the slide sleeve portion 53 toward the upper side in the axial direction. As described above, the inner peripheral tapered surface 57 comes into contact with the outer peripheral tapered surface 47 of the retainer 40 when the connection of the corrugated pipe T is completed (see FIG. 7). The inner circumferential tapered surface 57 aligns the center of the retainer 40 and the corrugated pipe T.

  A through hole 58 is formed in a part of the upper end side of the slide sleeve portion 53 (near the boundary step portion with the overhang portion 51) so as to penetrate the side wall of the portion 53 inward and outward. A ventilation member 59 is closely fitted in the through hole 58. 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. Due to this property, for example, when a hole is opened in the corrugated tube due to an operator's nailing mistake, etc., the gas leaked from this hole passes between the metal tube portion of the corrugated tube and the resin coating coated on the outer surface thereof. Then, it flows into the joint 1 and is discharged from the retainer retainer 50 through the ventilation member 59 to the outside. In such a case, the gas leak can be detected by bringing the gas leak detector closer to the vicinity of the ventilation member 59 from the outside of the joint 1.

  A positioning collar (spacer) 60 and a disassembling ring 61 are detachably fitted on the outer peripheral surface of the upper end side of the slide sleeve portion 53. The positioning collar 60 and the disassembling ring 61 are separate bodies, and the disassembling ring 61 is disposed inside the positioning collar 60. The positioning collar 60 is a C-shaped ring member made of resin or the like. The positioning collar 60 is interposed between the lower end of the overhang 51 of the retainer presser 50 and the upper end of the joint body 10. When the positioning collar 60 is removed, the retainer presser 50 can be slid toward the back side of the joint body 10 (the lower side in FIG. 1). The disassembling ring 61 is a ring-shaped member made of resin or the like, and is formed with a separation portion that is thinner than the positioning collar 60 and partially thin. When the corrugated tube is pulled out from the joint 1 and disassembled after the corrugated tube is completely connected, the disassembling ring 61 is disconnected at the disconnecting portion and spread outward to be removed.

  An O-ring groove 62 is dug on the outer peripheral surface of the slide sleeve portion 53 below the ventilation member 59. An O-ring 63 is fitted in the O-ring groove 62. The O-ring 63 seals between the slide sleeve portion 53 and the inner surface of the upper inner hole portion 21 of the joint body 10. Further, a stop ring groove 65 is dug in the outer peripheral surface of the slide sleeve portion 53 below the O ring groove 62. A stop ring 67 is engaged in the stop ring groove 65. The depth of the stop ring groove 65 is larger than the diameter of the core wire of the stop ring 67.

  When the positioning collar 60 is removed and the retainer retainer 50 is slid in the joint body 10 back direction, the stop ring 67 is pushed into the stop ring groove 65, and the retainer retainer 50 slides within the joint body 10. Further, as shown in FIG. 7, when the stop ring 67 reaches the lower ring groove 23 on the inner surface of the upper inner hole 21 of the joint body 10, the stop ring 67 itself expands elastically and the joint body 10 and the retainer are expanded. The presser 50 is connected and fixed.

Next, the stopper 70 will be described.
The stopper 70 is disposed in the upper portion of the lower inner hole portion 25 of the inner hole 11 of the joint body 10. The stopper 70 is a ring-shaped member made of an elastic material such as resin or metal. The stopper 70 includes a ring portion 71 and an engagement piece portion 73 that extends from the ring portion 71 toward the inside and below. A plurality (eight in a row) of the engaging piece portions 73 are formed at equal intervals in the circumferential direction of the ring portion 71. An inclination angle of each engagement piece portion 73 with respect to the ring portion 71 is, for example, 50 °.

Next, the restriction ring 90 will be described with reference to FIGS. 1 and 2.
FIG. 2 is a view showing a regulating ring of the corrugated pipe joint of FIG. (A) is the top view seen from the upper side, (B) is the A section enlarged view of (A), (C) is a front view, (D) is the BB sectional view of (C). It is a figure and (E) is the C section expanded sectional view of (D).
As shown in FIG. 1, the restriction ring 90 is disposed at the inner peripheral surface inlet 56 of the retainer presser 50. As shown in FIG. 2, the regulation ring 90 includes an annular cap 91 and a U-shaped handle 93.

  The cap 91 is provided with a cylindrical restricting portion 95 for restricting the insertion of the corrugated tube on the inner peripheral side, and an upper outer peripheral surface 51a of the protruding portion 51 of the retainer presser 50 on the outer peripheral side (see FIG. 1B). A cylindrical covering portion 97 is provided so as to cover the surface. Further, the cap 91 has a cut-out portion 99a and a fracture portion 99b which become the split portions 99 in order to split the used regulating ring 90 in the radial direction and disengage it from the retainer presser 50. Each is formed on the side.

  The inner diameter of the inner peripheral portion 95a of the cylindrical restriction portion 95 is formed to be slightly larger than the outer diameter of the corrugated tube. For example, the outer diameters of the corrugated pipes having nominal diameters 8A, 15A, and 25A are 11.5 mm, 18.4 mm, and 30.8 mm, but the inner diameter of the inner peripheral part 95a of the cylindrical restricting part 95 corresponding to them is They are 11.8 mm to 12.2 mm, 18.7 mm to 19.1 mm, and 31.1 mm to 31.5 mm. The inner peripheral portion 95 a is disposed so as to be concentric with the inner peripheral surface inlet 56 of the retainer presser 50. For this reason, when the corrugated tube is deformed to be flatter than the limit, insertion is prevented by the inner peripheral portion 95a so that the corrugated tube cannot be inserted into the inner hole 11 of the joint body 10. Only a corrugated pipe having a good shape can be inserted into the inner hole 11 of the joint body 10 through the inner peripheral portion 95a.

  The inner peripheral portion 97a of the cylindrical covering portion 97 is formed so as to be fitted into the upper outer peripheral surface 51a (see FIG. 1B) of the overhang portion 51 of the retainer retainer 50. An annular convex portion 97c for retaining is formed on the inner peripheral portion 97a, and an annular concave portion 51c (FIG. 1) for retaining the mesh with the convex portion 97c is formed on the upper outer peripheral surface 51a. (B) is formed. As described above, since the regulating ring 90 is positioned with reference to the upper outer peripheral surface 51a, the inner peripheral surface inlet 56 of the retainer presser 50 and the inner peripheral portion 97a are centered with high accuracy to form a corrugated tube having a good shape. It can be inserted smoothly. In addition, since the restriction ring 90 has a structure that is difficult to be removed from the retainer presser 50, the restriction ring 90 is not accidentally dropped off, and the number of construction work can be reduced as the corrugated pipe joint 1 provided with the restriction ring 90 in advance. Can do.

  The notch 99 a is notched in a band shape extending radially inward from the outer peripheral surface of the cylindrical covering portion 97. The breaking portion 99b is formed in an arc shape in the inner peripheral portion 95a of the cylindrical regulating portion 95. The broken portion 99b is formed so as to connect the end surfaces of the notch 99a so that the cap 91 does not expand at the notch 99a. As shown in FIG. 2B, the width a of the fracture portion 99b is formed to be larger than the width b of the notch 99a. Thereby, although the details will be described later, when the regulating ring 90 that is no longer needed is divided by the split portion 99 to be detached from the retainer presser 50, contact between the fracture portion 99b and the corrugated pipe can be prevented. In addition, a cut 99d for facilitating breakage is provided in the center of the breakage portion 99b.

  The handle 93 is integrally formed so as to protrude radially outward on the outer periphery of the cap 91 facing the split portion 99 by 180 °. Once the corrugated pipe having a good shape is inserted into the inner hole 11 of the joint body 10 from the inner peripheral surface inlet 56 of the retainer retainer 50, the handle 93 is hooked with a finger and pulled outward in the radial direction. The resulting restriction ring 90 can be divided by the split portion 99 and detached from the retainer presser 50.

  According to the corrugated pipe joint 1 provided with the regulating ring 90 having the above-described configuration, when the corrugated pipe is deformed to be flatter than the limit, the corrugated pipe is joined from the inner peripheral surface inlet 56 of the retainer presser 50. Even when trying to insert into the inner hole 11 of the main body 10, the regulating ring 90 disposed at the inlet 56 cannot be inserted. Therefore, in the construction of corrugated pipe connection, it is possible to sufficiently secure the airtightness by inserting only the corrugated pipe having a good shape and hermetically sealing the outer surface.

Next, the operation and method of use of the corrugated pipe joint 1 having the above-described configuration will be described mainly based on FIGS.
FIG. 3A is a cross-sectional view showing a state in which the corrugated pipe is inserted into the corrugated pipe joint (a state in which the regulating ring is passed), and FIG. 3B is an enlarged cross-sectional view of a portion A in FIG.
FIGS. 4A, 4B, 4C, and 4D are diagrams sequentially illustrating the disengagement state of the regulating ring in FIG.
FIG. 5A is a cross-sectional view showing a state in which the corrugated pipe is being inserted into the corrugated pipe joint (a state in which the regulating ring is removed and inserted to the front of the stopper), and FIG. 5B is a part A of FIG. It is an expanded sectional view.
FIG. 6A is a cross-sectional view showing a corrugated pipe insertion completion state (stopper passing state) of the corrugated pipe joint, and FIG. 6B is an enlarged cross-sectional view of a portion A in FIG.
FIG. 7 (A) is a cross-sectional view showing the corrugated pipe construction completion state of the corrugated pipe joint (state where the positioning collar is removed and the retainer presser is pushed in), and FIG. 7 (B) is an enlarged view of portion A of FIG. 7 (A). It is sectional drawing.

  As shown in FIG. 3A, the corrugated tube T is inserted into the inner peripheral portion 95 a of the regulating ring 90 and inserted into the inner hole 11 of the joint body 10 from the inner peripheral surface inlet 56 of the retainer retainer 50. At this time, if the corrugated tube T is deformed so as to be flatter than the limit, the inner peripheral portion 95a cannot be inserted. However, if the shape is good, the inner peripheral portion 95a is shown in FIG. Can be inserted smoothly without touching.

  Next, the used regulation ring 90 is detached from the retainer presser 50. A finger is put on the handle 93 of the regulating ring 90 in the state of FIG. 4A and pulled outward in the radial direction (in the direction of arrow a in the figure). Then, as shown in FIG. 3B, since the cylindrical covering portion 97 of the regulating ring 90 covers the upper outer peripheral surface 51a of the overhanging portion 51, as shown in FIG. 4B, the fracture portion 99b. The cut portion 99a moves in the circumferential direction (in the direction of the arrow b in the figure) while contacting the upper outer peripheral surface 51a, and the split portion 99 is expanded. When the handle 93 is further pulled outward in the radial direction, the split portion 99 is further expanded as shown in FIGS.

  4B to 4D, the fracture portion 99b moves from the outer peripheral surface of the corrugated tube T at a predetermined interval. This is because, as described with reference to FIG. 2B, the width a of the fracture portion 99b is formed to be larger than the width b of the notch 99a. Therefore, the broken portion 99b does not directly contact the corrugated tube T, and the corrugated tube T can be prevented from being damaged. Finally, as shown in FIG. 4 (D), since the gap between the fracture portions 99b is opened larger than the diameter of the corrugated tube T, the used regulation ring 90 is detached from the retainer presser 50. Can do.

  When the corrugated tube T is further inserted into the inner hole 11 of the joint body 10 as shown in FIG. 5A, the tip of the corrugated tube T is inserted into the packing 30 from the retainer 40 as shown in FIG. Through the inside, it reaches the stopper 70, and the annular convex part t at the tip of the corrugated tube T hits each engagement piece 73 of the stopper 70.

  The inner diameter of the distal end portion of the engagement piece 73 of the stopper 70 is smaller than the outer diameter of the annular convex portion t of the corrugated tube T. Therefore, as shown in FIG. 6 (A), when the corrugated tube T is further pushed in, as shown in FIG. 6 (B), the annular convex portion t at the tip of the corrugated tube T pushes the engaging piece portions 73 apart. Can be pushed in.

  When the annular convex portion t at the tip of the corrugated tube T gets over each engaging piece portion 73, as shown in FIG. 3, each engaging piece portion 73 is elastically restored to its original state, and the annular concave portion tt at the tip of the corrugated tube T is obtained. Is engaged. At this time, even if the operator tries to pull out the corrugated tube T, the tip of the engaging piece 73 of the stopper 70 hits the annular recess tt at the tip of the corrugated tube T, so that the operator can feel this feeling by hand. That is, the stopper 70 plays a role of preventing an operator from making an operation mistake at the time of connection by letting the operator feel that the corrugated tube T is the push-in end.

  Next, as shown in FIG. 7A, the positioning collar 60 is removed, and the retainer presser 50 is pushed in while sliding toward the back side of the joint body 10. Then, the stop ring 67 externally fitted to the retainer presser 50 is compressed in the upper ring groove 22 in the upper inner hole portion 21 of the joint body 10 while sliding from the square groove 22a to the tapered groove 22b. The connection state between the joint body 50 and the joint body 10 is once released.

  As shown in FIG. 7B, when the stop ring 67 reaches the lower ring groove 23 in the upper inner hole portion 21 of the joint body 10, the stop ring 67 itself elastically expands in diameter, and the lower ring groove. 23, the retainer presser 50 and the joint body 10 are connected again. At this time, the inner peripheral tapered surface 57 at the inner peripheral edge of the lower end of the slide sleeve portion 53 of the retainer presser 50 contacts the outer peripheral tapered surface 47 of each divided piece 43 of the retainer 40. Then, each divided piece 43 of the retainer 40 is contracted in the inner diameter direction, and the tip of each claw 45 gradually narrows.

  Finally, each claw 45 engages with the annular recess of the corrugated tube T in a state where the inner peripheral tapered surface 57 of the slide sleeve portion 53 and the outer peripheral tapered surface 47 of each divided piece 43 are in surface contact. At this time, the retainer 40 is fixed between the retainer retainer 50 and the packing 30, and the corrugated tube T is fixed so as not to be extracted from the joint body 10 by the retainer 40, the retainer retainer 50 and the stop ring 67. The

  If the corrugated pipe T must be removed after the corrugated pipe T is connected to the joint 1, the disassembly ring 61 is cut and removed in FIG. 7, and the retainer presser 50 is attached to the joint body 10. Push further toward the back. Then, the stop ring 67 enters the lower corner groove 23 b from the upper corner groove 23 a in the lower ring groove 23 in the upper inner hole portion 21 of the joint body 10, and the stop ring 67 is detached from the stop ring groove 65 of the retainer presser 50. Thus, the connection between the joint body 10 and the retainer presser 50 is released, and the corrugated pipe T can be extracted from the upper side.

FIG. 8 is a cross-sectional view showing the overall configuration of the corrugated pipe joint according to the second embodiment of the present invention (in the middle of corrugated pipe insertion).
FIG. 9 is a view showing a regulating ring of the corrugated pipe joint of FIG. (A) is the top view seen from the upper side, (B) is a front view, (C) is the sectional view on the AA line of (A).
FIG. 10 is a perspective view showing the regulating ring of FIG. (A) is a figure which shows a free state, (B) is a figure which shows a diameter-reduced state.
The corrugated pipe joint 2 has the same configuration as the joint 1 except that the restriction ring 90 of the corrugated pipe joint 1 shown in FIG. Therefore, detailed description will be omitted.

  As shown in FIG. 8, the restriction ring 80 is disposed at the inner peripheral surface inlet 56 of the retainer presser 50. As shown in FIG. 9, the restriction ring 80 includes an annular cap 81 having an arcuate crack 89 and two handles 83 protruding outward in the radial direction. The restriction ring 80 is fitted into the inner peripheral surface inlet 56 with the crack 89 in a free state in an expanded state (the state shown in FIG. 10A) in a contracted state (the state shown in FIG. 10B), or The inner surface 56 is separated from the inlet 56. The cap 81 in which the crack 89 is in a closed state is formed with a cylindrical restricting portion 85 for restricting the insertion of the corrugated pipe on the inner peripheral side, and is engaged with the inner peripheral surface inlet 56 of the retainer presser 50 on the lower end side. A collar portion 87 is projected.

  An inner diameter of the inner peripheral portion 85a of the cylindrical restriction portion 85 in the contracted state is formed to be slightly larger than the outer diameter of the corrugated tube. For example, the outer diameters of the corrugated pipes having nominal diameters 8A, 15A, and 25A are 11.5 mm, 18.4 mm, and 30.8 mm, but the inner diameter of the inner peripheral part 85a of the cylindrical restricting part 85 corresponding to them is They are 11.8 mm to 12.2 mm, 18.7 mm to 19.1 mm, and 31.1 mm to 31.5 mm. The inner peripheral portion 85 a is formed so as to be concentric with the inner peripheral surface inlet 56 of the retainer presser 50. For this reason, when the corrugated pipe is deformed to be flatter than the limit, the insertion is prevented by the inner peripheral portion 85a so that the corrugated pipe cannot be inserted into the inner hole 11 of the joint body 10. Only a corrugated pipe having a good shape can be inserted into the inner hole 11 of the joint body 10 through the inner peripheral portion 85a.

  The outer peripheral portion 87 a of the inner collar portion 87 in the contracted state is formed so as to be engageable with the inner peripheral surface inlet 56 of the retainer presser 50. Since the restricting ring 80 has a restoring force in the expanding direction, the inner collar portion 87 is not easily removed from the inner peripheral surface inlet 56. As described above, since the regulating ring 80 is positioned with reference to the inner peripheral surface inlet 56, the inner peripheral surface inlet 56 and the inner peripheral portion 85a are centered with high accuracy to smoothly form a corrugated pipe having a good shape. It can be inserted. In addition, since the restriction ring 80 has a structure that is difficult to be removed from the retainer presser 50, the restriction ring 80 is not unexpectedly dropped, and the corrugated pipe joint 1 provided with the restriction ring 80 in advance reduces the number of work steps. Can do.

  The handle 83 is integrally formed so as to protrude radially outward on both sides of the crack 89 on the outer periphery of the cap 81. Once the corrugated pipe having a good shape is inserted into the inner hole 11 of the joint body 10 from the inner peripheral surface inlet 56 of the retainer retainer 50, it is unnecessary by placing the finger on the handle 83 and compressing it radially inward. The restricted regulating ring 80 can be detached from the retainer presser 50.

  According to the corrugated pipe joint 2 provided with the regulating ring 80 having the above-described configuration, when the corrugated pipe is deformed to be flatter than the limit, the corrugated pipe is joined from the inner peripheral surface inlet 56 of the retainer presser 50. Even when trying to insert into the inner hole 11 of the main body 10, the regulating ring 80 disposed at the inlet 56 cannot be inserted. Therefore, in the construction of corrugated pipe connection, it is possible to sufficiently secure the airtightness by inserting only the corrugated pipe having a good shape and hermetically sealing the outer surface.

FIG. 1 (A) is a cross-sectional view showing the overall configuration (pre-construction state) of the corrugated pipe joint according to the first embodiment of the present invention, and FIG. 1 (B) is an enlarged cross-sectional view of a portion A in FIG. 1 (A). It is. It is a figure which shows the control ring of the corrugated pipe joint of FIG. (A) is the top view seen from the upper side, (B) is the A section enlarged view of (A), (C) is a front view, (D) is the BB sectional view of (C). It is a figure and (E) is the C section expanded sectional view of (D). 3A is a cross-sectional view showing a state in which the corrugated pipe is being inserted into the corrugated pipe joint (cap passing state), and FIG. 3B is an enlarged cross-sectional view of a portion A in FIG. FIGS. 4A, 4B, 4C, and 4D are diagrams sequentially illustrating the disengagement state of the regulating ring in FIG. FIG. 5 (A) is a cross-sectional view showing a state in which the corrugated pipe is being inserted into the corrugated pipe joint (when the cap is removed and inserted to the front of the stopper), and FIG. It is sectional drawing. FIG. 6A is a cross-sectional view showing a corrugated pipe insertion completion state (stopper passing state) of the corrugated pipe joint, and FIG. 6B is an enlarged cross-sectional view of a portion A in FIG. FIG. 7 (A) is a cross-sectional view showing the corrugated pipe construction completion state of the corrugated pipe joint (state where the positioning collar is removed and the retainer presser is pushed in), and FIG. 7 (B) is an enlarged view of portion A of FIG. 7 (A). It is sectional drawing. It is sectional drawing which shows the whole structure (corrugated pipe insertion middle state) of the corrugated pipe joint which concerns on the 2nd form of this invention. It is a figure which shows the control ring of the corrugated pipe coupling of FIG. (A) is the top view seen from the upper side, (B) is a front view, (C) is the sectional view on the AA line of (A). FIG. 10 is a perspective view showing the restriction ring of FIG. 9. (A) is a figure which shows a free state, (B) is a figure which shows a diameter-reduced state. It is a figure which shows the example of the gas piping of a building typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 ... Corrugated pipe joint, 10 ... Joint main body, 11 ... Inner hole, 30 ... Packing, 40 ... Retainer, 50 ... Retainer presser, 51c ... Recessed part, 56 ... Inner peripheral surface inlet, 70 ... Stopper, 80, 90 ... Regulator ring, 81, 91 ... Cap, 83, 93 ... Handle, 85, 95 ... Cylinder regulator, 85a, 95a, 97a ... inner peripheral part, 87 ... inner collar part, 87a ... outer peripheral part, 89 ... crack, 97 ... cylindrical covering part, 97c ... convex part, 99 ... Split part, 99a ... Notch, 99b ... Broken part, T ... Corrugated tube

Claims (4)

A cylindrical joint body having an inner hole into which a corrugated pipe having an annular unevenness formed on the outer periphery is inserted;
A packing disposed in the inner hole and in contact with the outer surface of the corrugated pipe;
A retainer having a claw disposed in the inner hole and engaged with an annular recess of the corrugated tube;
The corrugated tube is inserted through an inner peripheral surface, and a cylindrical retainer presser that holds the retainer is provided.
Furthermore, the corrugated pipe joint is provided with a regulating ring having an inner peripheral portion which is disposed at the inner peripheral surface entrance of the retainer presser and into which the corrugated pipe deformed into a flat shape cannot be inserted. A crack is formed in the restriction ring, and it is easy to remove from the inner peripheral surface entrance of the retainer presser ,
Here, the restricting ring is a hollow cap-shaped member that covers the inlet of the retainer presser, and on the inner peripheral side thereof, a tubular restricting portion that restricts the insertion of the corrugated pipe is provided, A cylindrical covering portion covering the retainer presser is provided on the outer peripheral side,
As the fissure, a rupture portion formed in an arc shape in an inner peripheral portion of the cylindrical regulating portion, and a notch portion cut out in a strip shape extending radially inward from the outer peripheral surface of the cylindrical covering portion, Is provided,
The corrugated pipe joint according to claim 1 , wherein the fracture portion is formed so that the restriction ring connects end faces of the notches .   The corrugated pipe joint according to claim 2, wherein the restricting ring covers the outer circumferential surface of the retainer presser and expands along the outer circumferential surface when the ring is split.   The regulating ring is formed with a notch portion and a rupture portion which are split portions on the outer peripheral side and the inner peripheral side, respectively, and the width of the rupture portion is larger than the width of the notch portion, The corrugated pipe joint according to claim 3.

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