JP3046009B2 - One-touch fitting for flexible tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-touch joint for a flexible tube, and more particularly to a one-touch joint for a flexible tube formed of a corrugated tube used for gas piping and the like.

[0002]

2. Description of the Related Art As a conventional flexible tube joint of this type, a metal tubular main body having an abutment surface therein and a flexible tube from which a coating of several peaks of a corrugate tube has been removed are inserted. In this state, the distal end is engaged with a metal pressing ring screwed into the inside of the tubular main body, and the valley on the outer periphery of the corrugated tube of the flexible tube attached to the distal end of the pressing ring and inserted through the pressing ring. One having a retainer having a metal projection that can be fitted is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-159350.

In such a joint for a flexible tube, the flexible tube is inserted into the push ring in a state where the push ring is temporarily loosely screwed into the cylindrical main body, so that the crest at the tip of the flexible tube becomes the retainer. The protruding part is pushed out and passes through the position of this protruding part. With this, in a state where the tip of the corrugate tube projects from the tip of the retainer by a predetermined amount, the protrusion of the retainer engages with the valley of the corrugate tube. The distal end portion of the tube can be crushed and squeezed in a close state between the projection of the retainer and the contact surface of the tubular main body.

As a result, the flexible tube is connected to the joint in a sealed state, and the corrugated tube is sealed by crushing the corrugated tube between the metal portions, so that the sealed portion has fire resistance. And between the abutment surface of the cylindrical body and
It also has the effect of preventing the corrugated tube from slipping out.

[0005]

However, Japanese Patent Application Laid-open No.
In the joint described in Japanese Unexamined Patent Publication No. 159350, it is necessary to further screw the pressing ring after the insertion of the flexible tube as described above, and furthermore, it is necessary to crush the distal end portion of the corrugated tube by the screwing. There is a problem that requires power.

Accordingly, the present invention solves such a problem, so that the joint and the tube can be joined with one touch only by inserting the flexible tube into the joint, and the joint and the flexible tube can be prevented from coming off.
An object of the present invention is to make it possible to have both sealability and fire resistance of a seal portion.

[0007]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention provides a tubular body, a push ring whose tip is screwed into the inside of the tubular body, and a cover arranged inside the tubular body and the push ring. The flexible tube, the corrugated tube, the corrugated tube is inserted from the end of the pressing ring toward the outer peripheral portion of the collar inside the pressing ring and the tubular body, the inside of the pressing ring On the circumference, a tapered surface that expands in diameter toward the distal end side of the pressing ring is formed, and an annular retainer is disposed between the tapered surface and the collar. The retainer has an outer peripheral surface that can contact the tapered surface. And a protrusion protruding inward in the radial direction, comprising pressing means for pressing the retainer against a tapered surface, wherein the retainer has a protrusion on one end side, and an outer peripheral surface has another portion. Formed on the end side
From the one end to the other end
Notch in the direction of the axial center is formed at multiple positions in the circumferential direction
The other end has a projection formed by a peak of a corrugated tube.
The elastic pushing of the
Deformation for engaging the valley of the Lugate tube
When the flexible tube is inserted, the outer peripheral surface is separated from the tapered surface of the pressing ring when the flexible tube is inserted, and the peak of the outer periphery of the corrugate tube is formed. The protrusion is elastically pushed and expanded by the portion to allow passage of this peak, and by passing through this peak, the protrusion can be deformed to engage with the valley on the outer periphery of the corrugated pipe. An annular sealing material is provided inside the cylindrical main body, and the annular sealing material is capable of sealing the outer periphery of the corrugated tube ridge by its inner peripheral surface, and at least a part thereof is fire resistant. It is made of a material having properties.

With such a configuration, the flexible tube and the joint are sealed by a one-touch operation of merely inserting the flexible tube into the joint without any other operation such as screwing of the member. In this state, they are securely joined to each other.

[0009] Further, when a pulling-out force from the joint acts on the flexible tube, the outer peripheral surface of the retainer is pressed against the tapered surface of the inner periphery of the pressing ring, and the reaction force causes the radially inner surface of the protrusion to move. A directional force acts, and this force causes the projection to strongly engage the valley of the corrugated tube, thereby preventing the corrugated tube from coming out. In this case, the corrugated pipe is generally thin, but the collar backs up the corrugated pipe, and the force of the projection causes the corrugated pipe to be deformed or the joint to come off due to the deformation. Is reliably prevented.

[0010] The corrugated pipe and the joint are sealed by a seal material. Since at least a part of the seal material is formed of a fire-resistant material, the seal material has this fire resistance even when a fire or the like occurs. The parts formed of the material do not burn away, so that the required sealing properties are maintained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a flexible tube, which is a thin stainless steel corrugated tube 2;
The corrugated tube 2 is made up of a resin-made tubular covering 3 covering the outer periphery of the corrugated tube 2. In the corrugated tube 2, reference numeral 4 denotes a peak, and 5 denotes a valley. The flexible tube 1 is connected to the joint in a state where the coating 3 has been removed at several peaks of the corrugated tube 2.

In this joint, reference numeral 11 denotes a cylindrical main body which is formed of a metal such as brass and has an external thread portion 1 at one end thereof.
2 is formed so that it can be connected to a connected object such as a gas pipe. A hexagonal portion 13 is used for screwing the outer thread portion 12.
14 is an end surface on the other end side.

On the inner circumference at the other end of the cylindrical main body 11, an inner threaded portion 15 and a
, An annular sealing material housing 17 and a corrugated tube housing 18. The corrugated tube housing portion 18 is formed to have a smaller diameter than the packing housing portion 17, and a radially inner end surface 19 is formed at the back. This back end face 19
A collar accommodating portion 20 is formed on the inner periphery of the cylindrical main body on the further back side. An annular rubber sealing material 21 is housed in the packing housing 17.

Reference numeral 25 denotes a pressing wheel, which is formed in a cylindrical shape by a metal such as brass, and has a cylindrical main body 11 at one end thereof.
Has an outer threaded portion 26 which can be screwed into the inner threaded portion 15. A hexagonal portion 27 for screwing operation is formed on the outer circumference on the other end side of the pressing wheel 25. The hexagonal portion 27 is formed to have a larger diameter than the external thread portion 26, and
An end face 28 facing the first end face 14 is formed.
Reference numeral 29 denotes a distal end surface of the pressing ring 25, and the pressing ring 25 is
1 in the state of being screwed into
It is configured to approach.

An annular packing 31 is attached to the base of the end surface 28 of the pressing wheel 25. On the outer periphery of the press ring 25 at the mounting portion of the packing 31, an annular protrusion 32 functioning as a stopper for preventing the packing 31 from coming off from the press ring 25 is formed. The packing 31 is mounted at a predetermined position after getting over the annular protrusion 32.

A hole 33 through which the flexible tube 1 is inserted is formed in the pressing wheel 25 in a penetrating state. An annular groove 35 for accommodating the packing 34 is formed in the inner periphery of the hole 33 on the other end side of the press wheel 25. In the hole 33, the pressing wheel 2 is larger than the annular groove 35.
A cover housing 36 is formed on one end of the cover 5.
A tapered surface 37 whose diameter increases toward one end of the pressing wheel 25 is formed on the inner periphery of one end of the pressing wheel 25 in the hole 33. The tapered surface 37 is formed to have substantially the same diameter as the packing housing portion 17 of the cylindrical body 11 at one end side, that is, the opening side, of the pressing ring 25, while the coating body housing portion is formed at the other end side, that is, the back side of the pressing ring 25. The diameter is smaller than 36. Therefore, a radial step 38 is formed at the boundary between the cover housing 36 and the tapered surface 37.

Reference numeral 40 denotes a collar, which is formed of a metal such as brass or a resin having a required strength. The collar 40 extends over the inside of the cylindrical main body 11 and the pressing wheel 25 screwed into the cylindrical main body 11. It is inserted, and one end thereof is, for example, press-fitted and fixed in the collar accommodating portion 20 of the tubular main body 11. In this state, the other end of the collar 40 is
From the outside of the joint. Tapered surfaces 41 and 42 are formed on the outer periphery of one end and the other end of the collar 40, respectively. When the flexible tube 1 is inserted into the joint, the flexible tube 1 is fitted to the collar 40.

As shown in FIG. 1, the pressing wheel 25 is connected to the cylindrical main body 11.
An annular retainer 44 is disposed between the inner peripheral tapered surface 37 of the press ring 25 and the outer peripheral surface of the collar 40 in a state in which the collar is screwed into the retainer. 1 to 4, the retainer 44 is formed of a metal material such as brass,
A radially inwardly protruding portion 45 is formed on one end side, that is, on the opening side of the pressing wheel 25. The protrusion 45 is formed such that its inner diameter is smaller than the outer diameter of the peak 4 of the corrugated pipe 2 and equal to or greater than the outer diameter of the valley 5. A tapered surface 46 whose diameter gradually increases toward the back side of the press ring 25 is formed on the inner periphery of the inner side of the protrusion 45 on the back side of the press ring 25. Further, the tapered surface 37 of the pressing wheel 25 is provided on the outer periphery of the other end of the retainer 44.
An outer peripheral tapered surface 47 having the same inclination as that of the outer peripheral surface is formed. However, the angles of the two tapered surfaces 37 and 47 may be equal or may differ to some extent.

Further, the retainer 44 has a notch 48 in the axial direction from one end side having the projection 45 to the other end side.
Are formed at a plurality of positions in the circumferential direction. This notch 48 has reached just before the other end of the retainer 44,
The retainer 44 is configured to be continuous in the circumferential direction only at the other end where the notch 48 is not formed. The continuous portion in the circumferential direction is formed as a thin portion 49 whose outer peripheral portion is cut away as compared with the tapered surface 48. An annular groove 50 having a rectangular cross section is formed on the outer periphery of one end of the retainer 44.

As shown in FIG. 1 and FIG.
A compression coil spring 51 as a pressing means is interposed between 1 and the retainer 44. This coil spring 51
As shown in FIG. 5, the large ring 52 has a large ring portion 52 at one end, a small ring portion 53 at the other end, and a coil portion 54 connecting the ring portions 52 and 53 to each other. The small ring portion 53 is fitted into the annular groove 50 of the retainer 44 while being in contact with the sealing material 21. The configuration is such that the retainer 44 can be pressed in the axial direction toward the tapered surface 37 of the pressing wheel 25 by the action of the coil portion 54.

As shown in FIG. 1 and FIG.
Reference numeral 1 denotes a cylindrical body in which a ring-shaped refractory section 56 and a general rubber section 57 are integrated in the axial direction. The refractory portion 56 and the general rubber portion 57 are formed so that the inner diameter and the outer diameter are equal, and are formed so that the dimensions in the axial direction are substantially equal. Fireproof part 56
Has a configuration in which, for example, thermally expandable graphite is mixed into nitrile rubber. The general rubber portion 57 is formed of, for example, nitrile rubber.

In such a structure, when forming a joint, first, the collar 40 is attached to the cylindrical main body 11 by the tapered surface 4.
The sealing member 21 is inserted into the housing portion 17 of the tubular main body 11 in that state by press-fitting according to the guide 1. The small ring portion 5 of the coil spring 51 is inserted into the annular groove 50 of the retainer 44.
3 with the retainer 44 and the coil spring 51 fitted together,
It is housed in any one of the insides of the tapered surface 37 of the pressing wheel 25. The packing 31 and the packing 34 are attached to the pressing wheel 25 in advance. At this time, since the small ring portion 53 of the coil spring 51 is fitted to the annular groove 50 of the retainer 44 as described above, the retainer 44 and the coil spring 51 have good handleability. It is.

Then, in this state, the pressing wheel 25 is connected to the cylindrical main body 1.
When screwed into 1, the state shown in FIG. 7 is obtained. That is, when the end surface 28 of the pressing wheel 25 approaches the end surface 14 of the cylindrical main body 11, the packing 31 is compressed, and the retainer 44
By the action of the coil spring 51, the tapered surface 37 of the pressing wheel 25
And the outer peripheral tapered surface 47 is
Is held by the pressing wheel 25 in a state of being centered with respect to the pressing wheel 25.

The joint and the flexible tube 1 in this state
7 was cut off from the state shown in FIG. 7 at the valley portion 5 of the corrugated tube 2 as shown in FIG. 1, and the coating 3 was removed at several peaks at the tip of the corrugated tube 2. The flexible tube 1 in the state is inserted into the hole 33 from the end of the pressing wheel 25 so that the corrugated tube 2 is guided by the tapered surface 42 of the collar 40 and is fitted into the collar 40. At this time, since the end of the collar 40 slightly protrudes from the pressing ring as described above, the outer fitting of the corrugated tube 2 to the collar 40 can be easily performed.

Then, as shown in FIG. 8, the peak 4 at the tip of the corrugate tube 2 hits the projection 45 of the retainer 44 held by the pressing wheel 25 in a centered state, and resists the force of the spring 51. The retainer 44 is moved in a direction approaching the seal member 21 while compressing the spring 51. Then, the outer peripheral tapered surface 47 of the retainer 44 separates from the tapered surface 37 of the pressing wheel 25.

In this state, the flexible tube 1
, The spring 51 can no longer be compressed anymore, and this time, as shown in FIG.
Acts on the tapered surface 46 of the projection 45 of the retainer 44,
The retainer 44 is to be pushed and expanded. At this time, since a plurality of cuts 48 are formed in the retainer 44 in the circumferential direction, and the thin portion 49 is formed in the retainer 44, the push of the retainer 44 can be easily performed. In addition, the push-out is performed against the elasticity of the small ring portion 53 fitted in the annular groove 50 of the retainer 44 in the coil spring 51.

Similarly, when several peaks at the tip of the corrugated pipe 2 pass through the projection 45 of the retainer 44, the several peaks at the tip of the corrugated pipe 2 enter the inside of the sealing material 21 as shown in FIG. At this time, the sealing material 21 functions so that its inner peripheral surface is in close contact with the peak portion 4 of the corrugated tube 2 and seals with the corrugated tube 2. FIG.
The state at this time is shown. At this time, the retainer 44
Is returned to the original reduced diameter state by the elasticity of the thin portion 49 and especially the elasticity of the small ring portion 53 of the spring 51.
While receiving the push-back force to the taper surface 37 side by 1
The protrusion 45 fits into and engages with the valley 5 of the corrugated tube 2. The cover 3 of the flexible tube 1 fits into the housing 36 and approaches the step 38. Further, in this state, the packing 34 of the pressing wheel 25 seals the outer periphery of the covering 3 of the flexible tube 1. The packings 31 and 34 are mainly used to prevent water and the like from entering the inside of the joint.

As described above, the flexible tube 1 and the joint are sealed in a one-touch operation only by inserting the flexible tube 1 into the joint without any other operation such as screwing of members. They can be securely joined to each other.

When a force is applied to the flexible tube 1 from the joint, the outer peripheral tapered surface 47 of the retainer 44 in which the projection 45 is engaged with the valley 5 of the corrugated tube 2 hits the tapered surface 37 of the press ring 25. , Retainer 44
Receives a radially inward reaction force from the pressing wheel 25. Then
The projection 45 of the retainer 44 presses the outer periphery of the valley 5 of the corrugated pipe 2 over the entire circumference, so that the engagement between the retainer 44 and the corrugated pipe 2 is ensured. The detachment of the flexible tube 1 is prevented. At this time, since the corrugated tube 2 is externally fitted to the collar 40, it is backed up by the collar 40, and thus the thin corrugated tube 2 is pressed by the projection 45 of the retainer 44 so that the corrugated tube 2 is radially inward. The retainer 44 is prevented from being deformed in the direction, and the retaining prevention function of the retainer 44 is prevented from being reduced by the occurrence of such deformation.

If the joint is exposed to a high temperature due to a fire or the like after the joining is completed, even if the general rubber portion 57 of the sealing material 21 is burned out, the heat-expandable graphite expands in the refractory portion 56, and the corrugated graphite expands. The sealing property with the pipe 2 is maintained.
Therefore, required fire resistance is ensured.

In the above, the small ring portion 53 of the coil spring 51 fits into the annular groove 50 on the outer periphery of the retainer 44, and the diameter of the retainer 44 expanded by passing through the corrugated pipe 2 is reduced to the original state. Although the configuration described above has been described, if the diameter can be reliably reduced by the elasticity of the retainer 44 itself, it is not necessary to operate the small ring portion 53 in this manner. In that case, the annular groove 5 is provided in the retainer 44.
0 may not be formed, and the end of the spring 51 on the retainer 44 side may simply press the end face of the retainer 44 in the axial direction.

FIGS. 10 and 11 show another embodiment of the present invention. Here, the retainer 44 is
A compression coil spring 51 for centering by pressing
A ring-shaped spring 58 that fits into the annular groove 50 of the retainer 44 and returns the retainer 44 to its original reduced diameter state when passing through the corrugated tube 2 is formed separately. Therefore, the small ring portion 53 of the compression coil spring 51 comes into contact with the distal end surface of the retainer 44.

FIG. 12 shows still another embodiment of the present invention. Here, the retainer 44 is disposed without using a compression coil spring as a pressing unit. That is, when the inner diameter of the protrusion 45 of the retainer 44 is not so large as compared with the outer diameter of the collar 40, the protrusion may be formed at one location in the circumferential direction as shown in the figure without using a compression coil spring as the pressing means. When the 45 contacts the collar 40, the retainer 44 is roughly centered. Therefore, in that case, when the corrugate tube 2 is inserted, the retainer 44
However, even if the retainer 44 is pushed by the corrugated pipe 2 and moved to a portion having a large inner diameter on the tapered surface 37, that is, in the vicinity of the tip of the pressing ring 25, no large misalignment occurs in the retainer 44, and the peak 4 Can be passed without hindrance. A ring-shaped spring 58 shown in FIG. 11 is fitted in the annular groove 50 of the retainer 44.

In the case of FIG. 12 as well, if the retainer 44 can be reliably reduced in diameter by its own elasticity when the corrugated tube 2 is inserted, the annular groove 5 is formed on the outer periphery of the retainer 44.
0 may not be formed, so that the ring-shaped spring 58 may not act.

FIGS. 13 to 17 show still another embodiment of the present invention. Here, as a member that presses the retainer 44 in the axial direction toward the tapered surface 37 of the pressing wheel 25,
Instead of the coil spring 51 described above, a cylindrical rubber body 61 disposed between the seal member 21 and the retainer 44 is used.

The rubber body 61 is formed integrally with the rubber member 57 using the same material as the seal member 21, that is, the general rubber portion 57. That is, the rubber body 61 has a base end 62 continuous with the rubber portion 57 and a distal end 63
Is configured to contact the distal end surface 64 of the retainer 44,
As shown in FIG. 13, the retainer 44 can be pressed toward the tapered surface 37 by the elastic force in the axial direction. The rubber body 61 has an inner diameter of the sealing material 21.
Is formed to be somewhat larger than the inner diameter of the sealing material 21.
When the corrugated tube 2 is inserted into the tube, no resistance is caused. Further, the rubber body 61 is formed to have a smaller outer diameter than the sealing material 21 so as to have a small thickness in the radial direction with an appropriate thickness. A tapered surface 65 having a slight inclination is formed on the outer periphery of the tip portion 63 of the rubber body 61.

In such a configuration, the one in which the sealing member 21 and the rubber body 61 are integrated as shown in FIG. 14 is disposed inside the cylindrical main body 11 as shown in FIG. 13, and the retainer 44 is disposed. When the pressing ring 25 is screwed into the cylindrical main body 11, the retainer 44 is pressed toward the tapered surface 37 of the pressing ring 25 by the action of the rubber body 61, and the outer peripheral tapered surface 47 is pressed against the tapered surface 37. Thus, the pressing wheel 25 is held by the pressing wheel 25 in a centered state.

The flexible tube 1 is attached to the joint in this state.
As shown in FIG. 15, the ridge 4 at the tip of the corrugated tube 2 hits the projection 45 of the retainer 44, and the rubber 61 is compressed in the axial direction against the elastic force of the rubber 61, as shown in FIG. While moving, the retainer 44 is moved in a direction approaching the sealing material 21. Then, the outer peripheral tapered surface 47 of the retainer 44 separates from the tapered surface 37 of the pressing wheel 25. At this time,
As shown in FIG. 13 and FIG.
Since the tapered surface 65 is formed on the outer circumference of the rubber member 3, the rubber body 61 is elastically deformed so as to expand radially outward between the seal member 21 and the retainer 44 as shown in FIG. That is, interference with the corrugate tube 2 due to elastic deformation so as to expand inward in the radial direction is prevented.

In this state, the flexible tube 1
Is inserted, the rubber body 61 can no longer be compressed any more. This time, as shown in FIG. 16, the peak portion 4 of the corrugated tube 2 acts on the tapered surface 46 of the projection 45 of the retainer 44, and this retainer 44 is Try to push. At this time, since a plurality of cuts 48 are formed in the retainer 44 in the circumferential direction, and the thin portion 49 is formed in the retainer 44, the push and spread of the retainer 44 can be easily performed.

Similarly, when several peaks at the tip of the corrugated pipe 2 pass through the projection 45 of the retainer 44, several peaks at the tip of the corrugated pipe 2 are removed as shown in FIG.
Is sealed by entering the inside of the. At this time, the retainer 44 has returned to the original reduced diameter state due to the elasticity of the thin portion 49, and receives the pushing back force to the tapered surface 37 side by the rubber body 61, and the protrusion 45 becomes the valley of the corrugate tube 2. It gets stuck in the part 5 and gets involved.

As described above, the flexible tube 1 and the joint are sealed by the one-touch operation of simply inserting the flexible tube 1 into the joint without any other operation such as screwing of the member. In this state, they can be securely joined to each other.

In the embodiment shown in FIGS. 13 to 17, no annular groove is formed on the outer periphery of the retainer 44. Therefore, as described above, the retainer 44 is originally reduced in diameter only by its own elasticity. You will return to the state. If necessary, similarly to the case of the above-described embodiment, an annular groove may be formed in the retainer 44 in a foreign capital, and a ring-shaped spring for applying a diameter reducing force to the retainer 44 may be attached. Good. In addition, if the sealing member 21 and the rubber body 61 are integrally formed as described above, the handleability is improved and the number of parts is reduced, but they may be formed separately.

[0043]

As described above, according to the present invention, the flexible tube can be connected to the joint by one-touch operation only by inserting the flexible tube into the joint without any other operation such as screwing of members. Can be securely joined to each other in a sealed state. Further, since the outer peripheral surface of the retainer is pressed against the tapered surface of the inner periphery of the pressing wheel, and the reaction force causes the projection to strongly engage the valley of the corrugated pipe, it is possible to prevent the flexible tube from coming out of the joint. At this time, the collar backs up the corrugated pipe, so that it is possible to reliably prevent the corrugated pipe from being deformed by the force of the projection or from coming out of the joint due to the deformation. Furthermore, since the corrugated pipe and the joint are sealed by a sealing material, and at least a part of the sealing material is formed of a fire-resistant material, even in the event of a fire or the like, the fire-resistant material can be used. The formed part does not burn out, and thus the required sealing performance can be maintained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a one-touch joint for a flexible tube according to an embodiment of the present invention.

FIG. 2 is a perspective view of a retainer in FIG.

FIG. 3 is another perspective view of the retainer.

FIG. 4 is a sectional view of the retainer.

FIG. 5 is a perspective view of the coil spring in FIG. 1;

FIG. 6 is a perspective view of a sealing material in FIG. 1;

FIG. 7 is a sectional view showing a state before a flexible tube is inserted into the joint of FIG. 1;

FIG. 8 is an enlarged sectional view of a main part showing a next stage of FIG. 7;

FIG. 9 is an enlarged sectional view of a main part showing a next stage of FIG. 8;

FIG. 10 is an enlarged sectional view of a main part showing a configuration of a one-touch joint for a flexible tube according to another embodiment of the present invention.

11 is a perspective view of the ring-shaped spring in FIG.

FIG. 12 is an enlarged sectional view of a main part showing a configuration of a one-touch joint for a flexible tube according to still another embodiment of the present invention.

FIG. 13 is an enlarged sectional view of a main part showing a configuration of a one-touch joint for a flexible tube according to still another embodiment of the present invention.

FIG. 14 is a perspective view of a sealing material and a rubber body in FIG.

FIG. 15 is an enlarged sectional view of a main part showing a next stage of FIG.

FIG. 16 is an enlarged sectional view of a main part showing a next stage of FIG.

FIG. 17 is an overall sectional view showing the next stage of FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible tube 2 Corrugated tube 11 Cylindrical main body 21 Sealing material 25 Pressing ring 37 Tapered surface 40 Collar 44 Retainer 45 Projection 47 Outer peripheral tapered surface 51 Coil spring (pressing means) 56 Fireproof part 61 Rubber body (pressing means)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mikio Nakaoka 2-10-16 Minamikagaya, Suminoe-ku, Osaka-shi Inside Shinwa Sangyo Co., Ltd. (72) Inventor Kazuyoshi Kariki 2 Minamikagaya, Suminoe-ku, Osaka-shi No. 10-16, Shinwa Sangyo Co., Ltd. (56) References JP-A-7-174276 (JP, A) JP-A 4-66488 (JP, U) JP-A 60-139988 (JP, U) Kaihei 3-125984 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 33/00 F16L 37/00-37/26

Claims (11)

(57) [Claims] 1. A joint for a flexible tube constituted by a corrugated tube, comprising: a tubular main body; a push ring having a distal end screwed into the tubular main body; A collar disposed over the inside, wherein the flexible tube is configured such that the corrugated tube can be inserted from an end of the pressing ring toward an outer peripheral portion of the collar inside the pressing ring and the tubular main body, A tapered surface is formed on the inner periphery of the pressing wheel, the diameter of which increases toward the tip end of the pressing wheel. An annular retainer is disposed between the tapered surface and the collar, and the retainer can contact the tapered surface. Outer peripheral surface,
A protrusion protruding radially inward, the retainer having a protrusion on one end, and an outer peripheral surface on the other end
The tapered surface formed on the other end from the one end side
The axial cuts toward the end are at multiple positions in the circumferential direction
Formed on the other end side of the corrugated tube.
The elastic projection of the protrusion that expands and the protrusion
And deformation of the corrugated tube for engagement with the valley
By forming a thin portion for performing, when the flexible tube is inserted, while being pushed by this flexible tube, the outer peripheral surface is configured to be separated from the tapered surface of the pressing ring, and the outer periphery of the corrugated tube is formed. The protrusion is elastically pushed and expanded by the peak to allow passage of the peak, and by passing through the peak, the protrusion is deformed to engage with the valley on the outer periphery of the corrugate pipe. An annular sealing material is provided inside the tubular main body, and the annular sealing material can seal the outer periphery of the peak portion of the corrugated tube by its inner peripheral surface, and at least a part thereof is provided. A one-touch fitting for a flexible tube, which is formed of a material having fire resistance. 2. The one-touch joint for a flexible tube according to claim 1, further comprising a pressing means for pressing the retainer against the tapered surface. 3. The one-touch joint for a flexible tube according to claim 2, wherein the pressing means is a coil spring. 4. A ring-shaped spring that exerts a force to return the projection to its original state when the projection is elastically pushed and expanded by the crest of the corrugated tube in relation to the outer periphery of the retainer. The one-touch joint for a flexible tube according to any one of claims 1 to 3, wherein a one-touch joint is provided. 5. The retainer according to claim 1, wherein the pressing means is a coil spring,
The outer periphery of the projection of the corrugated tube
When it is elastically expanded, return it to its original state.
A ring-shaped spring that exerts the desired force is provided.
The one-touch joint for a flexible tube according to claim 2 , wherein the coil spring and the ring-shaped spring are formed as an integral member. 6. The one-touch joint for a flexible tube according to claim 2, wherein the pressing means is a cylindrical rubber body disposed between the seal member and the retainer. Claim 7. A tubular rubber member constituting the pressing means is characterized by being formed integrally with the sealing member 6
One-touch fitting for flexible tube as described. 8. A ring-shaped spring which engages with the outer periphery of the retainer and exerts a force for returning the projection to its original state when the projection is elastically pushed and expanded by the crest of the corrugated tube. The one-touch joint for a flexible tube according to claim 6, wherein a one-touch joint is provided. 9. The fire-resistant material according to claim 1, wherein the fire-resistant material is fire-resistant rubber containing thermally expandable graphite.
The one-touch joint for a flexible tube according to any one of the above. 10. The one-touch joint for a flexible tube according to claim 9, wherein the sealing material is formed integrally with a portion including and not including the heat-expandable graphite. 11. A flexi tube comprising a corrugated tube.
This is a retainer used for fittings for
The joint has a tubular main body and a distal end portion inside the tubular main body.
A push ring screwed into the inside of the cylindrical body and the push ring
A collar disposed across the collar , wherein the retainer is disposed between the push wheel and the collar.
An annular body and one end of the retainer
A projection formed radially inwardly and
Formed on the other end side of the tener and contacts the inner peripheral taper surface of the press wheel
Formable at multiple locations along the circumferential direction with possible outer taper
Cut in the axial direction from the one end to the other end
The corrugated tube formed on the other end side
Due to the elastic expansion of the protrusion by this and the passage of this peak
Deformation of the protrusion for engagement with the valley of the corrugated tube
Characterized by having a thin portion for performing
One-touch fitting retainer for shibble tube.