JP3900448B2 - Corrugated pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a corrugated pipe joint for connecting corrugated pipes.
[0002]
[Prior art]
Corrugated pipes are widely used for passing gas, tap water, and the like, and various forms of corrugated pipe joints have been proposed and put into practical use for connecting corrugated pipes. Examples of the corrugated pipe joint include those disclosed in Japanese Patent No. 2686237 and Japanese Patent No. 2726380. Such a known joint includes a joint body, a fastening member screwed into the joint body, and a retainer rotatably engaged with the fastening member. A connection hole is formed in the joint body, a through hole is formed in the tightening member, and one end portion of the corrugated pipe to be connected is inserted into the connection hole of the joint body through the through hole of the tightening member. Further, the retainer has a plurality of engaging protrusions, and the engaging protrusions expand to get over the peak portion of the corrugated tube, and contract to contract with the valley portion of the corrugated tube.
[0003]
In this known joint for corrugated pipe, the corrugated pipe is connected by tightening the fastening member after inserting the corrugated pipe through the through hole of the fastening member. That is, when the distal end portion of the corrugated tube is inserted through the through hole of the tightening member, the plurality of engaging projections of the retainer are engaged with a valley portion that continues to about one peak of the distal end portion of the corrugated tube. When the tightening member is tightened in such a state, the retainer moves toward the shoulder of the joint main body by the action of the tightening member, and the corrugated pipe protruding from the retainer by the shoulder of the joint main body and the retainer is reduced. One pile is crushed and thus one end of the corrugated tube is connected as required.
[0004]
[Problems to be solved by the invention]
In such a joint, it is important to hold the joint body and the fastening member in a predetermined positional relationship in order to crush about one peak of the tip of the corrugated pipe. More specifically, the tip of the corrugated tube inserted through the through hole of the tightening member abuts against the shoulder portion of the joint body, and the insertion is prevented by abutting against the shoulder portion. Therefore, by setting the distance from the shoulder portion of the joint body to the engaging projection of the retainer to about one mountain of the corrugated tube, about one mountain of the tip portion of the corrugated tube is surely projected from the engaging projection of the retainer. Thus, about one peak of the tip of the corrugated tube can be crushed and connected.
[0005]
In order to set the distance between the shoulder of the joint body and the engaging projection of the retainer in this way, for example, it is necessary to provide a spacer between the tightening member with which the retainer engages and the joint body. Relatedly, there is a problem in that the configuration of the entire joint becomes complicated and the number of components increases.
[0006]
In order to solve such a problem, the present applicant has proposed a new type of corrugated tube (Japanese Patent Application No. 10-226661). The proposed corrugated pipe includes a joint body having a connection hole, a tightening member having a through hole, and a retainer having a plurality of engaging claws that can be expanded and contracted, and the retainer is connected to the joint body. Removably attached to the hole. In this corrugated pipe, since the retainer is mounted on the joint body, it is not necessary to accurately maintain the joint body and the fastening member in a predetermined positional relationship, and the conventionally required spacer can be omitted.
[0007]
However, in such a corrugated tube, when the entire retainer is formed of, for example, a metal material, the following problem newly occurs. That is, when the tip of the corrugated tube is inserted through the through-hole of the tightening member, when the corrugated tube peak portion passes, a plurality of engaging claws expand to get over the peak portion. After getting over the part, it is not sufficiently reduced, and the plurality of engaging claws are maintained in an expanded state. If maintained in such an expanded state, the plurality of engaging claws do not engage with the valleys of the inserted corrugated tube, and the inserted corrugated tube can be easily pulled out, and the corrugated tube is connected. May become unstable.
[0008]
The objective of this invention is providing the coupling for corrugated pipes which can reduce the some engaging claw part expanded by insertion of the corrugated pipe | tube, and can make it reliably engage with the trough part of a corrugated pipe | tube.
Another object of the present invention is to provide a corrugated pipe joint that can set the number of corrugated pipes protruding from the retainer without using a spacer or the like.
[0009]
[Means for Solving the Problems]
  The present invention includes a joint body having a connecting hole extending in the axial direction, a fastening member having a through hole extending in the axial direction, and a retainer that engages with a corrugated pipe inserted through the through hole of the fastening member. Comprising a joint for a corrugated pipe in which the joint body and the fastening member are screwed together,
  The retainer includes a base portion and a plurality of engaging claw portions provided at one end portion of the base portion at circumferential intervals, and the plurality of engaging claw portions are expanded and contracted. Is free,
  The joint body is provided with an annular elastic member corresponding to the plurality of engaging claws of the retainer, and the annular elastic member is elastically deformed to expand the plurality of engaging claws. Allow,
  The tightening member has a pressing portion that acts on the base portion or the plurality of engaging claws of the retainer,
  The joint body isFurthermore,A fitting inner surface into which the plurality of engaging claws of the retainer are provided, which is provided adjacent to the shoulder portion facing the tightening member, and the shoulder portion.And an annular protrusion provided on the fastening member side of the fitting inner surfaceHave
  The retainer is further provided with an annular engagement protrusion that protrudes radially outward from the base part,
  The retainer is configured such that the annular engagement protrusion of the base portion abuts on the annular protrusion of the joint body, and the outer peripheral surface of the base portion is held on the peripheral surface of the annular protrusion.It is detachably mounted in the connection hole of the joint body, and in this mounted state, the plurality of engaging claws are located radially inside the annular elastic member,
  When the corrugated tube is inserted through the through-hole of the tightening member, the plurality of engaging claws of the retainer expands and climbs over the ridges of the corrugated tube, and the elastic restoring action of the annular elastic member By contracting and engaging the valley of the corrugated tube,
  When the tightening member is tightened, the pressing portion of the tightening member acts on the base portion of the retainer or the plurality of engaging claws, thereby the retainer.The annular engagement protrusionIs the joint bodyThe annular projection ofAnd is moved relative to the joint body in the axial direction so as to be fitted into the fitting inner surface.
[0010]
  According to the present invention, the joint body is provided with the annular elastic member corresponding to the plurality of engaging claws of the retainer. Therefore, when the corrugated tube is inserted through the through hole of the fastening member, the annular elastic member By elastically deforming, the plurality of engaging claws of the retainer are allowed to expand, the plurality of engaging claws expand to get over the corrugated tube peak, and the annular elastic member is based on By returning, the plurality of engaging claws of the retainer are contracted and engaged with the valleys of the corrugated tube. Since the annular elastic member acts on the plurality of engaging claws of the retainer in this way, the plurality of engaging claws are reliably reduced and engaged with the valleys of the corrugated tube. Also, the base part of the retainerAnnular engagement protrusionIs the connection hole of the fitting bodySo that it touches the annular projection ofSince it is detachably attached, the distance from the shoulder portion of the joint body to the engaging claw portion of the retainer is kept constant. Therefore, when the corrugated tube is inserted through the through hole of the tightening member, a predetermined number of corrugated tubes corresponding to the distance from the shoulder portion of the joint body to the plurality of engaging claws protrude from the engaging claws, and tighten. The number of ridges of the corrugated pipe projecting from the engaging claw portion of the retainer can be made constant regardless of the position of the attaching member.Furthermore, since the outer peripheral surface of the base portion of the retainer is held by the peripheral surface of the annular protrusion of the joint body, the retainer can be held concentrically with respect to the connection hole of the joint body. FurthermoreThe tightening member has a pressing portion that acts on the base portion of the retainer or the plurality of engaging claws, so that when the tightening member is tightened, the pressing portion becomes the base portion of the retainer or the plurality of engaging portions. Acting on the claw portion, the retainer is detached from the joint body, moved in the axial direction, and fitted into the fitting inner surface of the joint body, thus crushing the peak portion of the corrugated pipe and connecting to the joint body be able to.
[0011]
  Further, in the present invention, the annular elastic member is composed of an elastic sleeve mounted on an inner peripheral surface of the joint body, and the elastic sleeve is formed on the joint body.The annular protrusionIt extends to the outer peripheral surface of the plurality of engaging claw portions of the retainer attached to the retainer.
  According to the present invention, since one end portion of the elastic sleeve attached to the inner peripheral surface of the joint body extends to the outer peripheral surface of the engaging claw portion of the retainer, the elastic sleeve is engaged with a plurality of engagements when expanded. It comes to act on the nail part. Therefore, with the simple configuration described above, the plurality of engaging claws of the retainer can be allowed to expand, and the expanded engaging claws can be reliably reduced.
[0012]
  In the present invention, the joint body has an inner peripheral surface on the joint body.The annular projection ofAn annular mounting recess is provided corresponding to the plurality of engaging claws of the retainer attached to the retainer, the annular elastic member is formed of an elastic ring or a coil spring, and the elastic ring or coil spring is the annular recess. It is attached to.
[0013]
According to the present invention, the annular elastic member is constituted by an elastic ring or a coil spring, and the elastic ring or the coil spring is attached to an annular mounting recess provided corresponding to the engaging claw portion of the retainer. Therefore, even with such a configuration, the plurality of engaging claws of the retainer can be expanded by elastic deformation, and the engaging claws of the retainer expanded by the elastic restoring action can be reliably reduced. .
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, various embodiments of a corrugated pipe joint according to the present invention will be described with reference to the accompanying drawings.
First embodiment
First, with reference to FIGS. 1-4, 1st Embodiment of the coupling for corrugated pipes according to this invention is described. 1 is a cross-sectional view of the upper half of the first embodiment of the corrugated pipe according to the present invention, FIG. 2 is a half cross-sectional view showing the retainer of the corrugated pipe joint of FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing the upper half of the corrugated pipe joint in which a part of the corrugated pipe is inserted, and FIG. 4 is a partial cross-sectional view showing a part of the corrugated pipe joint of FIG. is there.
[0017]
Referring to FIG. 1, the corrugated pipe joint according to the first embodiment includes a joint body 2, a fastening member 4 screwed into the joint body 2, and a retainer 6 attached to the joint body 2. ing. A through hole 8 extending in the axial direction (left and right direction in FIG. 1) is formed at one end side (left end side in FIG. 1) of the joint body 2, and the axis line is formed at the other end side (right end side in FIG. 1). A connecting hole 10 extending in the direction is formed, and the through hole 8 and the connecting hole 10 communicate with each other. In the joint body 2, an annular shoulder 12 is provided at the back of the connection hole 10, and the shoulder 12 is provided on the fastening member 4 side, that is, toward the right side in FIG. 1. The shoulder 12 is provided with an accommodation recess 14, and a ring-shaped heat-resistant gasket 16 is attached to the accommodation recess 14. The heat-resistant gasket 16 is connected to the tip of the corrugated pipe 18, the joint body 2, and the like as described later. Seal between. An annular protrusion 20 that extends in the axial direction toward the fastening member 4 is integrally provided on the inner peripheral portion of the shoulder portion 12, and the annular protrusion 20 is one end of the corrugated pipe 18 to be inserted. It acts on the inner peripheral surface of the part and holds it concentrically.
[0018]
The connection hole 10 of the joint body 2 is provided with a fitting inner surface 22 adjacent to the shoulder 12. The inner surface of the fitting inner surface 22 is gradually reduced in a taper shape in the insertion direction of the corrugated pipe 18 indicated by an arrow 23. An annular recess 24 is provided adjacent to the right side of the fitting inner surface 22. Further, an annular protrusion 26 is provided adjacent to the right side of the annular recess 24. The annular protrusion 26 protrudes inward in the radial direction, and the inner surface (left surface in FIG. 1) of the tip end portion extends in a tapered manner in the radially outward direction toward the annular recess 24 side. An internal thread portion 28 is provided adjacent to the right side of the annular protrusion 26, and the internal thread portion 28 is provided to the other end of the joint body 2. In addition, the outer peripheral part 29 of the intermediate part of the coupling main body 2 is formed in hexagon shape, and the external thread part 30 is provided in the outer peripheral surface of the one end part. In this embodiment, an annular mounting recess 31 is further provided in the axial direction intermediate portion of the annular recess 24 of the joint body 2, and an elastic ring 33 as an annular elastic member is attached to the annular mounting recess 31. The elastic ring 33 can be formed from, for example, hard synthetic rubber. Such a joint body 2 is formed of a metal material such as brass, for example.
[0019]
The retainer 6 is mounted in advance in the connection hole 10 of the joint body 2. Referring also to FIG. 2, the retainer 6 includes a base portion 32 that is annularly continuous, and a plurality of (one end portion of the annular base portion 32 (the left end portion in FIG. 1) provided at intervals in the circumferential direction. 6) in the illustrated form, and a slit 35 extending in the axial direction is formed between the adjacent engaging claws 34. Each engaging claw portion 34 has a claw 36 extending in the axial direction from one end of the base portion 32 and protruding radially inward at a tip portion thereof. The circle defined by the tips of the claws 36 of the engaging claws 34 is set smaller than the outer diameter of the peak portion 18a of the corrugated pipe 18 to be inserted and larger than the outer diameter of the valley portion 18b. Since the engaging claw part 34 is separated by the slit 35, the engaging claw part 34 expands radially outward with its base part, that is, the connection part with the base part 32 as a fulcrum. Can be reduced.
[0020]
Such a retainer 6 can be formed of, for example, a metal material such as brass, a synthetic resin material, or the like, and is formed of a composite material in which the engaging claw portion 34 is a metal material and the base portion 32 is a synthetic resin material. You can also
The retainer 6 is attached to the joint body 2 as shown in FIG. At the other end of the base portion 32 of the retainer 6, an annular engagement protrusion 38 that protrudes radially outward is integrally provided. The retainer 6 is detachably mounted on the joint body 2 by inserting the retainer 6 into the connection hole 10 of the joint body 2 and bringing the engagement protrusion 38 of the base portion 32 into contact with the annular protrusion 26. In the mounted state of the retainer 6, as shown in FIG. 1, the claw 36 of the engaging claw portion 34 of the retainer 6 is positioned radially inward facing the annular recess 24 of the joint body 2. Movement outward in the direction is allowed, and the engaging claw portion 34 can be expanded. Further, the elastic ring 33 attached to the joint body 2 is located on the radially outer side of the engaging claw portions 34, and acts on the outer peripheral surfaces of the engaging claw portions 34 when the engaging claw portions 34 are expanded (see FIG. 3). . In addition, since the inner surface of the tip end portion of the annular protrusion 26 of the joint body 2 is formed in a tapered shape, a larger expansion of the engaging claw portion 34 is allowed. In this embodiment, the joint body 2 is provided with the annular recess 24 to allow the engaging claw 34 of the retainer 6 to expand. However, in order to provide the same function as the annular recess 24, the connection of the joint body 2 is possible. It is also possible to increase the inner diameter of the hole 10 over its entire length.
[0021]
In this embodiment, the tip surface of the annular protrusion 26 is formed in a short cylindrical shape. With this configuration, the outer peripheral surface of the base portion 32 of the retainer 6 is mounted on the peripheral surface of the tip surface 40, and both peripheral surfaces are in contact with each other over a predetermined range in the axial direction. 10 can be held concentrically.
[0022]
In this retainer 6, since the annular engagement protrusion 38 abuts against the annular protrusion 26 of the joint body 2, a small pressing force (for example, a force acting when the fastening member 4 is tightened by hand, or the corrugated pipe 18 is used. The force does not disengage from the joint body 2 even when a force is applied, but it acts when a large pressing force (for example, the tightening member 4 is tightened using a tightening tool). When the force (2) is applied, the annular engaging protrusion 38 of the retainer 6 is elastically deformed (or plastically deformed) to get over the annular protrusion 26 of the joint body 2 and to escape from the joint body 2 by overcoming it. If there is a possibility that the engaging projection 38 gets over the annular projection 26 of the joint body 2 with a small pressing force, the base portion 32 of the retainer 6 is not detached with a small pressing force, for example, by an adhesive or press-fitting. It can be fixed to the annular protrusion 26. On the other hand, when it is easy to get over the annular protrusion 26 of the engaging protrusion 38, for example, the engaging protrusion 38 can be provided with a tapered surface inclined inward in the radial direction toward the insertion direction indicated by the arrow 23. .
[0023]
Referring to FIG. 1 again, the fastening member 4 is made of, for example, a nut, and a through-hole 42 extending through the fastening member 4 in the axial direction (left-right direction in FIG. 1) is formed in the fastening member 4. The corrugated pipe 18 to be connected is inserted into the connection hole 10 of the joint body 2 through the through hole 42. A male screw portion 44 is provided on the outer peripheral surface in the vicinity of one end of the tightening member 4. The male threaded portion 44 of the tightening member 4 is screwed into the female threaded portion 28 of the joint body 2, and the joint body 2 and the tightening member 4 are threaded together. In addition, a pressing portion 46 that extends in the axial direction toward the joint body 2 is provided at one end of the tightening member 4. In this embodiment, the pressing portion 46 is provided in an annular shape, but a plurality of pressing portions 46 may be provided at intervals in the circumferential direction. The pressing portion 46 is provided corresponding to the base portion 32 of the retainer 6, and acts on the end surface of the base portion 32 of the retainer 6 when the tightening member 4 is tightened as described later. In this embodiment, an annular protrusion 47 protruding in the axial direction is provided on the inner peripheral portion of the front end surface of the pressing portion 46, and the annular protrusion 47 holds the retainer 6 concentrically with respect to the fastening member 4. To act.
[0024]
The outer peripheral surface of the other end 49 of the tightening member 4 is formed in a hexagonal shape, and an annular recess is formed on the inner surface side of the hexagonal end of the tightening member 4. A sealing member 48 is attached. The permselective seal member 48 is made of, for example, porous polyethylene, and prevents water or the like from entering the inside of the joint from the outside. However, when gas leaks from the seal portion inside the joint, or protection is provided. When the gas leaks from between the tube 54 and the corrugated pipe 18, the leaked gas is allowed to permeate the seal member 48 and leak to the outside. The latter leak occurs when a hole is formed in a part of the corrugated pipe 18 or the like. By confirming that there is no leak outside from this leak portion by means of leak detection such as application of soapy water or a gas detector, the soundness of the piping system can be confirmed. Further, an annular recess 50 is formed on the inner peripheral surface of the other end 49 of the fastening member 4, and an annular seal 52 having a substantially T-shaped cross section is attached to the annular recess 50. The annular seal 52 seals between the protective tube 54 that covers the corrugated pipe 18 and the fastening member 4. The fastening member 4 is made of brass, for example.
[0025]
Next, with reference to FIG.1, FIG3 and FIG.4, the connection method of the corrugated pipe | tube 18 using the coupling for corrugated pipes mentioned above is demonstrated. As shown in FIG. 1, the corrugated pipe 18 is formed in a wave shape, and crests 18 a and troughs 18 b are alternately provided and covered with a protective tube 54 made of synthetic resin over the entire length thereof. When connecting the corrugated pipe 18, first, a part of the protective tube 54 covering one end of the corrugated pipe 18 is removed, and several peaks, for example, 4 to 6 peaks are exposed from one end of the corrugated pipe 18. Further, the joint main body 2 and the tightening member 4 are screwed in advance. In this embodiment, since the retainer 6 is mounted on the joint main body 2, it is not necessary to hold the fastening member 4 and the joint main body 2 in a predetermined positional relationship. There is no need for a spacer for holding the substrate.
[0026]
Next, in a screwed state of the joint body 2 and the fastening member 4, one end portion of the corrugated pipe 18 (the end portion from which the protective tube 54 has been removed) passes through the through hole 42 of the fastening member 4, and an arrow to the left in FIG. Insert in the direction indicated by 23. When inserted, as shown in FIG. 3, when the crests 18a of the corrugated pipe 18 pass through the claw 36 of the engagement claw 34 of the retainer 6, the engagement claw 34 expands and the crest Get over 18a. At this time, the elastic ring 33 positioned outside the engaging claw 34 is elastically deformed, and the engagement claw 34 is allowed to expand by elastically deforming. And when the trough part 18b of the corrugated pipe 18 passes the claw 36 of the engaging claw part 34, these engaging claw parts 34 contract and engage with this trough part 18b. At this time, the elastic ring 33 elastically deformed by the expansion of the engaging claw 34 returns to the original state, and the engaging claw 34 is reliably reduced by this elastic restoring action.
[0027]
In this embodiment, as shown in FIG. 1, the distance from the shoulder portion 12 of the joint body 2 to the claw 36 of the engaging claw portion 34 of the retainer 6 is set to the length of about one mountain of the corrugated pipe 18. Therefore, when the corrugated pipe 18 is inserted as described above, the first peak 18a from the tip of the corrugated pipe 18 passes through the claw 36 of the retainer 6, but the second peak 18a from the tip of the corrugated pipe 18 Since the tip of the tube 18 abuts against the shoulder 12 of the joint body 2, it cannot pass through the claw 36, and the claw 36 of the engaging claw 34 of the retainer 6 has a peak 18 a at the first peak from the tip. To the next valley 18b. As described above, the engagement claw portion 34 is configured to be engaged with the trough portion 18b of the first crest portion 18a from the front end of the corrugated tube 18, thereby providing an insertion confirmation function. That is, when the corrugated pipe 18 is inserted as required, the engaging claw 34 of the retainer 6 is engaged with the trough 18b of the corrugated pipe 18, and therefore the corrugated pipe 18 is pulled out even if it is to be pulled out. I can't. In particular, since the engaging claw 34 is contracted by the action of the elastic ring 33, the claw 36 of the engaging claw 34 is reliably engaged with the trough 18b of the corrugated pipe 18, and the above-described removal is prevented. On the other hand, when the corrugated pipe 18 is not inserted as required, the engaging claw 34 of the retainer 6 is not engaged with the valley 18b of the corrugated pipe 18, and therefore the corrugated pipe 18 is to be pulled out. Then, it can be easily pulled out. For this reason, the insertion of the corrugated pipe 18 can be confirmed depending on whether the corrugated pipe 18 can be pulled out. Further, in this way, by projecting one ridge of the corrugated pipe 18 from the engaging claw portion 34 of the retainer 6, the number of crushed ridges of the corrugated pipe 18 is reduced, and the axial length of the entire joint is reduced. be able to. In this embodiment, the distance from the shoulder portion 12 of the joint body 2 to the claw 36 of the engaging claw portion 34 of the retainer 6 is set to the length of about one mountain of the corrugated pipe 18. Can be set to a length of a plurality of ridges of the corrugated pipe 18, for example, 2-5 ridges, and the number of ridges corresponds to the number of crushed mountains.
[0028]
Thereafter, the tightening member 4 is tightened using a tightening tool (not shown). When the tightening member 4 is tightened using the tightening tool, the pressing portion 46 of the tightening member 4 comes into contact with the base portion 32 of the retainer 6, and a large pressing force acts by further tightening of the tightening member 4, so that the retainer. 6 is detached from the joint body 2. When the tightening member 4 is further tightened, the pressing portion 46 of the tightening member 4 moves the retainer 6 engaged with the valley portion 18b of the corrugated pipe 18 toward the shoulder portion 12 of the joint body 2, The outer peripheral portion of the front end of the engaging claw 36 of the retainer 6 is fitted into the fitting inner surface 22 of the joint body 2, and by this fitting, the expansion of the engaging claw 34 of the retainer 6 is surely prevented. The claw 36 of the joint claw portion 34 acts to bite into the valley portion 18b of the corrugated pipe 18, and reliably moves the peak portion 18a of the corrugated pipe 18 protruding from the retainer 6 toward the shoulder portion 12 of the joint body 2. be able to. As can be easily understood, the fitting inner surface 22 of the joint body 2 has its inner diameter gradually tapered in the axial direction, but this inner diameter may be the same size in the axial direction.
[0029]
When the tightening member 4 is tightened as required in this way, as shown in FIG. 4, the peak portion 18 a of the corrugated pipe 18 protruding from the engaging claw portion 34 of the retainer 6 is formed on the shoulder portion 12 and the retainer 6. The tip of the crushed crest 18a is pressed against the heat-resistant gasket 16 on the shoulder 12 of the joint body 2 and the heat-resistant gasket 16 is provided between the tip of the corrugated pipe 18 and the joint body 2. It is securely sealed.
[0030]
As described above, in a state where the joint body 2 and the tightening member 4 are screwed together, after inserting one end portion of the corrugated pipe 18 through the through hole 42 of the tightening member 4, the tightening member 4 is tightened. The corrugated pipe 18 can be connected by a simple operation of tightening using the.
[0031]
Second embodiment
Next, with reference to FIG.5 and FIG.6, 2nd Embodiment of the coupling for corrugated pipes according to this invention is described. FIG. 5 is a cross-sectional view of the upper half of the second embodiment of the corrugated pipe according to the present invention, and FIG. 6 is a half cross-sectional view showing the elastic sleeve of the corrugated pipe joint of FIG. In the following description, substantially the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
[0032]
5 and 6, in this embodiment, the annular elastic member is composed of an elastic sleeve 62. The illustrated elastic sleeve 62 has an annular mounting portion 64, and a plurality of (10 in this embodiment) action piece portions 66 are provided at one end of the annular mounting portion 64 at intervals in the circumferential direction. The action piece portion 66 extends in the axial direction. The elastic sleeve 62 can be formed from, for example, a synthetic resin.
[0033]
As shown in FIG. 5, the elastic sleeve 62 is mounted in the connection hole 10 of the joint body 2A. In this embodiment, the fitting inner surface 22 of the joint body 2A is positioned on the back side in the insertion direction indicated by the arrow 23 (positioned adjacent to the housing recess 14) and on the front side in the insertion direction (annular) An attachment portion 64 of an elastic sleeve 62 is attached to the cylindrical inner surface of the fitting inner surface 22 by means such as press fitting, for example. Thus, in the state where the elastic sleeve 62 is mounted, the distal end portion of the action piece portion 66 extends into the annular recess 24 of the joint body 2A, and the radii of the plurality of engaging claws 34 of the retainer 6 mounted on the joint body 2A. Located outside in the direction. Other configurations of the second embodiment are substantially the same as those of the first embodiment.
[0034]
In this second embodiment, when one end of the corrugated tube 18 (the end from which the protective tube 54 has been removed) is inserted in the direction indicated by the arrow 23 through the through hole 42 of the tightening member 4, When 18a passes the claw 36 of the engaging claw part 34 of the retainer 6, these engaging claw parts 34 expand and get over the mountain part 18a. At this time, the action piece portion 66 of the elastic sleeve 62 located outside the engagement claw portion 34 is elastically deformed radially outward, so that the engagement claw portion 34 is allowed to expand. And when the trough part 18b of the corrugated pipe 18 passes the claw 36 of the engaging claw part 34, these engaging claw parts 34 contract and engage with this trough part 18b. At this time, the action piece portion 66 of the elastic sleeve 62 elastically deformed by the expansion of the engagement claw portion 34 returns to the original state, and the engagement claw portion 34 is surely reduced by this elastic restoring action, and thus the above-described first portion. The same effects as those of the first embodiment are achieved.
[0035]
Third embodiment
Next, a third embodiment of the corrugated pipe joint according to the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of the upper half of the third embodiment of the corrugated tube according to the present invention.
In FIG. 7, in this embodiment, the annular elastic member is constituted by a coil spring 72. As is easily understood by comparing FIG. 1 and FIG. 7, the coil spring 72 is an annular mounting formed in the annular recess 24 of the joint body 2 in place of the elastic ring 33 in the first embodiment. Mounted in the recess 31. Other configurations of the third embodiment are substantially the same as those of the first embodiment.
[0036]
Also in the third embodiment, when the crest portion 18a of the corrugated pipe 18 passes through the claw 36 of the engagement claw portion 34 of the retainer 6, these engagement claw portions 34 are expanded so that the crest portion 18a is expanded. Get over. At this time, the coil spring 72 is elastically deformed radially outward, and the engagement claw 34 is allowed to expand. And when the trough part 18b of the corrugated pipe 18 passes the claw 36 of the engaging claw part 34, these engaging claw parts 34 contract and engage with this trough part 18b. At this time, the coil spring 72 elastically deformed by the expansion of the engaging claw 34 returns to its original state, and the engaging claw 34 is reliably reduced by this elastic restoring action, and thus the same effect as described above can be obtained. Achieved.
[0037]
The various embodiments of the corrugated pipe joint according to the present invention have been described above. However, the present invention is not limited to these embodiments, and various changes and modifications can be made without departing from the scope of the present invention. .
For example, in the illustrated embodiment, the base portion 32 of the retainer 6 is formed in a continuous annular shape, but is not limited thereto, and may be formed in a substantially C shape with a part cut away. When configured in this manner, the base portion itself can be expanded and contracted.
[0038]
In the illustrated embodiment, the retainer 6 attached to the joint body 2 (2A) is configured to be detached. Instead, when a large pressing force is applied to the retainer 6, a part of the base portion 32, For example, the base of the engaging protrusion 38 can be cut. Even if comprised in this way, the retainer 6 leaves | separates from the coupling main body 2 (2A), and is inserted in the fitting inner surface 22 of the coupling main body 2, and the corrugated fitting 18 can be connected similarly to having mentioned above.
[0039]
In the illustrated embodiment, the pressing portion 46 of the tightening member 4 acts on the base portion 32 of the retainer 6. Instead, the pressing portion 46 of the tightening member 4 is engaged with the retainer 6. It can be configured to act on the claw portion 34.
Furthermore, in the illustrated embodiment, the description has been made by applying the present invention to a configuration in which the retainer 6 is detachably attached to the joint body 2 (2A). However, the present invention is not limited to this, and the retainer rotates on the tightening member. The present invention can be similarly applied to a mode in which the retainer is moved in the axial direction together with the tightening member by freely mounting and tightening the tightening member.
[0040]
  According to the corrugated pipe joint of the first aspect of the present invention, since the annular elastic member mounted on the joint body acts on the plurality of engaging claws of the retainer, the plurality of engaging claws are reliably reduced. Engage with the trough of the corrugated tube. Also, the retainer base memberAnnular engagement protrusionThe fitting bodySo that it touches the annular projection ofBecause it is detachably mounted, the distance from the joint body shoulder to the retainer engaging claw is kept constant, and the corrugated protrusion protrudes from the retainer engaging claw substantially regardless of the position of the fastening member. The number of tubes can be made constant.Furthermore, since the outer peripheral surface of the base portion of the retainer is held by the peripheral surface of the annular protrusion of the joint body, the retainer can be held concentrically with respect to the connection hole of the joint body. Furthermore,Since the tightening member has a pressing portion that acts on the base portion of the retainer or the plurality of engaging claws, when the tightening member is tightened, the retainerThe annular engagement protrusion ofFitting bodyAnnular projectionCan be moved in the axial direction to be fitted into the fitting inner surface of the joint body, and the crest portion of the corrugated pipe can be crushed and connected to the joint body.
[0041]
According to the corrugated pipe joint of claim 2 of the present invention, when the one end portion of the elastic sleeve attached to the inner peripheral surface of the joint main body extends to the outer peripheral surface of the engaging claw portion of the retainer, The elastic sleeve acts on the plurality of engaging claws, and the elastic sleeve is elastically deformed, thereby allowing the plurality of engaging claws of the retainer to expand, and the elastic sleeve that is elastically deformed By returning to the original state, the expanded engagement claw portion can be reliably reduced.
[0042]
According to the corrugated tube of claim 3 of the present invention, the elastic ring or coil spring as the annular elastic member is elastically deformed to allow the plurality of engaging claws of the retainer to be expanded and elastic. By returning the deformed elastic ring or coil spring to the original state, the expanded engagement claw portion can be reliably reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an upper half of a first embodiment of a corrugated pipe joint according to the present invention.
FIG. 2 is a half sectional view showing a retainer of the corrugated pipe joint of FIG.
3 is a cross-sectional view showing the upper half of a state when a part of the corrugated pipe is inserted into the corrugated pipe joint of FIG. 1. FIG.
4 is a partial cross-sectional view showing a part of a state in which a corrugated pipe is connected in the corrugated pipe joint of FIG. 1;
FIG. 5 is a cross-sectional view of the upper half of the second embodiment of the corrugated pipe joint according to the present invention.
6 is a half sectional view showing an elastic sleeve of the corrugated pipe joint of FIG. 5;
FIG. 7 is a cross-sectional view of the upper half of the third embodiment of the corrugated pipe joint according to the present invention.
[Explanation of symbols]
2,2A Fitting body
4 Tightening member
6 Retainer
10 Connection hole
12 shoulder
18 Corrugated tube
18a Yamabe
18b Tanibe
22 Inner surface
24 annular recess
26 Annular projection
28 Female thread
32 Base part
33 Elastic ring
34 engaging claw
36 nails
38 engagement protrusion
42 Through hole
44 Male thread
46 Pressing part
62 Elastic sleeve
72 Coil spring

Claims (3)

A joint body having a connecting hole extending in the axial direction; a fastening member having a through hole extending in the axial direction; and a retainer engaged with a corrugated pipe inserted through the through hole of the fastening member, A joint for a corrugated pipe in which a joint body and the fastening member are screwed together,
The retainer includes a base portion and a plurality of engaging claw portions provided at one end portion of the base portion at circumferential intervals, and the plurality of engaging claw portions are expanded and contracted. Is free,
The joint body is provided with an annular elastic member corresponding to the plurality of engaging claws of the retainer, and the annular elastic member is elastically deformed to expand the plurality of engaging claws. Allow,
The tightening member has a pressing portion that acts on the base portion or the plurality of engaging claws of the retainer,
The joint body further includes a shoulder portion facing the tightening member, a fitting inner surface provided adjacent to the shoulder portion and into which the plurality of engagement claws of the retainer are fitted , An annular protrusion provided on the fastening member side of the fitting inner surface ,
The retainer is further provided with an annular engagement protrusion that protrudes radially outward from the base part,
The retainer is configured so that the annular engagement protrusion of the base portion abuts on the annular protrusion of the joint body, and the outer peripheral surface of the base portion is held by the peripheral surface of the annular protrusion. The connecting hole is detachably mounted, and in the mounted state, the plurality of engaging claws are located on the radially inner side of the annular elastic member,
When the corrugated tube is inserted through the through-hole of the tightening member, the plurality of engaging claws of the retainer expands and climbs over the ridges of the corrugated tube, and the elastic restoring action of the annular elastic member By contracting and engaging the valley of the corrugated tube,
When the tightening member is tightened, the pressing portion of the tightening member acts on the base portion or the plurality of engaging claws of the retainer , whereby the annular engaging protrusion of the retainer is A corrugated joint for a corrugated pipe, which is separated from the annular protrusion of the joint body, moves relative to the joint body in the axial direction, and is fitted into the fitting inner surface. The annular elastic member is composed of an elastic sleeve attached to the inner peripheral surface of the joint body, and the elastic sleeve is the plurality of engaging claws of the retainer attached to the annular protrusion of the joint body. The corrugated pipe joint according to claim 1, wherein the corrugated pipe joint extends to the outer peripheral surface of the corrugated pipe. An annular mounting recess is provided on the inner peripheral surface of the joint body corresponding to the plurality of engaging claws of the retainer attached to the annular protrusion of the joint body, and the annular elastic member is an elastic ring. Or it is comprised from a coil spring and the said elastic ring or coil spring is attached to the said annular recessed part, The coupling for corrugated pipes of Claim 1 characterized by the above-mentioned.

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