JP3067436B2 - Connection device for flexible pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a flexible pipe, which allows a flexible pipe such as a flexible gas pipe to be attached to a joint or the like with one touch.

[0002]

2. Description of the Related Art A conventional apparatus of this type is disclosed in
No. 91592. As shown in FIG. 4, the apparatus described in this publication is configured such that a flexible pipe 2 (hereinafter, sometimes abbreviated as a flexible pipe) as a gas pipe is connected to a joint main body 1 which is an apparatus main body. The configuration is briefly described as follows.

That is, a mounting hole 1a into which the flexible pipe 2 is inserted is formed in the joint body 1, and a tapered hole portion 1b is formed in an inner peripheral surface of one end of the mounting hole 1a. Inside the tapered hole 1b, a packing 3 made of an elastic material having a crest 3a formed on the inner peripheral surface is inserted. An annular coil spring 4 is fixed to an end of the packing 3.
A cylindrical member 6 urged by a spring 5 in a direction opposite to the insertion direction of the flexible tube 2 is disposed inside the packing 3.

[0004] In the connecting device having the above configuration, the flexible pipe 2
Is connected, the flexible tube 2 is inserted into the mounting hole 1a. Then, the peak 2a at the most distal end of the flexible pipe 2 abuts against the coil spring 4, and the packing 3 and the coil spring 4
To the large diameter side of the tapered hole 1b. With this movement, the diameter of the coil spring 4 expands. Then, when the coil spring 4 moves a predetermined distance, the inner diameter of the coil spring 4 becomes larger than the peak 2a of the flexible pipe 2, so that the peak 2a passes through the inside of the coil spring 4, but after passing through the peak 3a of the packing 3, The packing 3 and the coil spring 4 are further moved to the large diameter side of the tapered hole 1b.

When the packing 3 moves further by a predetermined distance, it hits the step surface 1c of the joint body 1 and cannot move any further. When the flexible pipe 2 is further inserted in this state, the peak 2a of the flexible pipe 2
Overcome sequentially while elastically deforming a. And mountain 2
When “a” crosses the peak 3 a located at the rearmost end of the packing 3, the insertion of the flexible tube 2 is stopped, and the hand is released from the flexible tube 2. Then, the flexible tube 2 is pushed back by the spring 5 to the small diameter side of the tapered hole portion 1b via the cylindrical member 6. Following this, the packing 3 and the coil spring 4 are pushed back.
As a result, the peak 3a of the packing 3 is
a, and the coil spring 4 engages with the peak 2a. Thereby, the flexible pipe 2 is connected to the joint body 1.

[0006]

In the above-mentioned conventional connecting device, the flexible pipe 2 is connected to the joint main body 1 by the packing 3 and the coil spring 4. However, since the packing 3 is formed of an elastic material, a large connection strength cannot be expected. On the other hand, since the diameter of the coil spring 4 is reduced only by the difference in diameter of the tapered hole portion 1b corresponding to the distance L in which the packing 3 moves, the coil spring 4 is only in contact with the peak portion 2a near its top. For this reason, when the flexible pipe 2 is strongly pulled, the flexible pipe 2 or the coil spring 4 is deformed, and the ridges 2a of the flexible pipe 2 may escape through the coil spring 4 to the outside. The connection strength to tube 2 was low. Thus, the conventional connection device has low connection strength,
There was a problem with the reliability of the connection.

If the length of the tapered hole portion 1b is increased to thereby extend the moving distance of the packing 3, the coil spring 4 is engaged with the ridge portion 2a of the flexible pipe 2 on the valley portion 2b side. be able to. But if you do so,
Another problem that the overall length of the joint main body (device main body) 1 becomes longer with the increase in the length of the tapered hole portion 1b is caused.

Further, in the above connection device, it is necessary to insert the flexible tube 2 to a predetermined position so that each peak 2a of the flexible pipe 2 is engaged with each peak 3a of the packing 3. Since it is difficult to confirm whether or not the operation has been performed, there has been a problem that the worker has anxiety.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is possible to improve the connection strength to a flexible pipe without lengthening the apparatus body, and to correctly insert the flexible pipe to a predetermined position. It is an object of the present invention to provide a flexible pipe connecting device capable of easily confirming the connection.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an apparatus body having a mounting hole into which a bellows-shaped flexible pipe having alternating peaks and valleys is formed. A support member that is slidably and rotatably fitted in the mounting hole and is moved in the insertion direction by abutting a flexible tube inserted into the mounting hole; An elastic member that urges in a direction opposite to the insertion direction, and has elasticity in a radial direction, and is expanded on an outer peripheral surface of the support member such that an inner diameter is larger than an outer diameter of a peak portion of the flexible pipe. And a ring-shaped engaging member movably mounted at the inner surface of the mounting hole, wherein the engaging member is engaged with the engaging member in the same direction as the insertion direction of the flexible tube. By blocking movement, When the supporting member is moved in the insertion direction by the flexible tube, the engaging member is moved relative to the supporting member in a direction opposite to the moving direction to separate from the outer periphery of the supporting member, and the engaging member itself is moved. 1st fitting into the valley of said flexible tube by the diameter reduction of
And a second engaging portion that engages with the engaging member fitted into the valley portion of the flexible tube to prevent the engaging member from moving in the direction opposite to the insertion direction of the flexible tube. And a projection is formed on the flexible tube side edge of the outer peripheral surface of the support member on which the engagement member is mounted.

[0011]

When the flexible tube is inserted into the mounting hole, the flexible tube hits the support member and moves the support member against the urging force of the elastic member. When the support member moves, the engagement member also attempts to move in the same direction, but the engagement member is prevented from moving in the insertion direction of the flexible tube by the first locking portion. Therefore, when the support member moves in the insertion direction of the flexible tube, the engagement member moves relatively in the direction opposite to the insertion direction, and separates from the support member. After disengagement, the engagement member is reduced in diameter and fitted into the valley of the flexible tube.

Here, when the engaging member is detached from the supporting member, the diameter of the engaging member is first increased because the engaging member gets over the convex portion, so that the insertion resistance of the flexible tube temporarily increases. Thereafter, when the engaging member gets over the convex portion, the insertion resistance is rapidly reduced. Thereby, it can be confirmed that the flexible tube has been inserted to the predetermined position, and that the engagement member has fit into the flexible tube as a result. In addition, when the engaging member is reduced in diameter and fits into the valley of the flexible tube, an impact and an impact sound are generated. Therefore, it is confirmed that the flexible tube has been inserted to a predetermined position.

By setting the inner diameter of the engaging member to be substantially the same as the outer diameter of the valley portion of the flexible tube in a natural state where the engaging member is not elastically deformed, the engaging member is positioned on the valley side of the flexible tube. Can be brought into contact.

When the force for inserting the flexible tube into the mounting hole is released after the engagement member has been fitted into the flexible tube, the support member is biased by the elastic member in the direction opposite to the insertion direction of the flexible tube. The engaging member is engaged with the second locking portion by the urging force. As a result, the engagement member is prevented from moving in the direction opposite to the insertion direction of the flexible tube, and thus the flexible tube is prevented from moving in the same direction. Thereby, the flexible tube is connected to the apparatus main body.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show an embodiment in which the present invention is applied to a connection joint of a flexible pipe used as a gas pipe, and FIG. 1 (A) is a longitudinal sectional view thereof.
FIG. 1B is a longitudinal sectional view showing a state in which a flexible tube is connected,
FIG. 2A is an enlarged cross-sectional view of a main part, and FIG. 2B is an enlarged cross-sectional view of a main part in a state where a flexible tube is connected.

First, the flexible pipe 10 to be connected to the connection joint of this embodiment will be described in advance.
As shown in the figure, the flexible tube 10 is made of a metal bellows tube 10A having alternating peaks 10a and valleys 10b, and a resin protection tube 10B covering the outside of the bellows tube 10A, as in the conventional case. It is composed of

Next, the connection joint will be described. In the figure, reference numeral 11 denotes a joint main body which is an apparatus main body. The joint main body 11 includes an upper main body 11A and a lower main body 11B, both of which are made of metal.

The upper main body 11A has a through hole 11a penetrating from the upper end surface to the lower end surface. The inner peripheral surface of the through hole 11a has two annular concave portions 11b, 11b.
c are respectively formed. A tapered surface (second locking portion) 11d is formed on the inner peripheral side of the lower end surface of the upper main body 11A. The inner diameter of the tapered surface 11d gradually decreases from the lower end to the upper end.

A cylindrical sealing member 12 made of an elastic material such as rubber is provided in the annular recess 11b of the upper main body 11A.
Is installed. An annular projection 12a is formed at the center of the inner peripheral surface of the seal member 12. The inner diameter of the protrusion 12a is smaller than the outer diameter of the protection tube 10B of the flexible tube 10. The inner diameter of the inner peripheral surface of the sealing member 12 other than the protruding portion 12a is larger than the outer diameter of the protective cylinder 10B.

A cylindrical sealing member 13 made of an elastic material such as rubber is provided in the annular recess 11c of the upper main body 11A.
Is installed. The inner diameter of the sealing member 13 is smaller than the outer diameter of the peak 10a of the bellows tube 10A, and
The diameter is larger than the outer diameter of b.

On the other hand, a tapered screw portion 11e for connecting to a gas appliance such as a gas cock is formed on a lower end portion outer peripheral surface of the lower main body portion 11B. Also, the lower main body 11B
Is formed with a through hole 11f penetrating from the upper end surface to the lower end surface. On the inner peripheral surface of the through hole 11f,
A large-diameter hole 11g is formed at the upper end, and a guide hole 11h having a smaller diameter than the large-diameter hole 11g is formed at an intermediate portion. A step surface 11i is formed between the large diameter hole 11g and the guide hole 11h.

The upper body 11A having the above-described structure,
The lower main body 11B is fixed to the lower main body 11B by being screwed together at the large-diameter hole 11g. In the fixed state, an annular storage space 11 is formed by the lower end surface of the upper main body 11A, the step surface 11i, and the large-diameter hole 11g therebetween.
j is formed. The through hole 1 of the upper main body 11A
1a and its lower end surface and through hole 11f in lower body portion 11B
A mounting hole 14 into which the flexible pipe 10 is inserted is formed by the above. Reference numeral 15 denotes an O-ring for ensuring airtightness between the upper main body 11A and the lower main body 11B.

A metal support member 16 is disposed in the guide hole 11h of the joint body 11. The support member 16
It has a cylindrical shape, and its outer diameter is formed to be smaller by about 10 μm to 50 μm than the inner diameter of the guide hole 11 h. Therefore, a slight gap is formed between the support member 16 and the guide hole 11h, and the gap is filled with silicon oil or grease. Thus, the space between the support member 16 and the guide hole 11h is airtight, and the frictional resistance between them is reduced as much as possible.
6 is slidable and rotatable with respect to the guide hole 11h.

As shown in detail in FIG. 2, an annular projection 16a is formed on the inner peripheral surface of the support member 16 at an intermediate portion thereof. A spring receiver 17 abuts on a surface facing downward of the protrusion 16a, and a spring (elastic member) 18 is disposed between the spring receiver 17 and the lower main body 11B. The spring 18 urges the support member 16 upward (in the direction opposite to the insertion direction of the flexible tube 10) via the spring receiver 17.

The spring receiver 17 is formed of a material having a low frictional resistance, such as a fluororesin or a polyacetal resin, so that the frictional resistance between the contact surface with the support member 16 is reduced. Particularly, in this embodiment, an annular projection 17a is formed on the upper surface of the spring receiver 17, which is a contact surface with the projection 16a, to reduce the contact area with the projection 16a, thereby further reducing the frictional resistance. ing. On the inner peripheral side of the upper surface of the spring receiver 17,
The spring receiver 17 inserted into the projection 16a is
A cylindrical portion 17b is formed to prevent the cylindrical portion 17b from being displaced with respect to, but the outer diameter of the cylindrical portion 17b is set so that a large frictional resistance does not occur between the cylindrical portion 17b and the protruding portion 16a.
The diameter is slightly smaller than the inner diameter of the protrusion 16a.

A tapered hole portion 16b is formed at the upper end of the inner peripheral surface of the support member 16 so that the diameter of the tapered hole portion 16b gradually decreases downward. A coating layer (not shown) made of a flexible resin such as rubber or resin is formed on the inner peripheral surface of the tapered hole portion 16b. The thickness of this coating layer is about 50 μm to 150 μm.

Here, when the flexible tube 10 is inserted into the mounting hole 14, the portion of the bellows tube 10 A that is slightly forward from the top of the peak portion 10 a located at the most distal side is the tapered hole of the support member 16. The inner peripheral surface of the portion 16b is in contact with the inner peripheral surface via the coating layer, and the frictional resistance between the flexible pipe 10 and the support member 16 in the circumferential direction is different from the support member 16 and other members that come into contact with the support member 16, That is, the joint body 11
(The inner peripheral surface of the guide hole 11h) and the frictional resistance between the spring support 17 and the guide hole 11h. Therefore, the flexible tube 10 rotates integrally with the support member 16 and the joint body 1
1 will be relatively rotated. In particular, in this embodiment, when the bellows tube 10A is brought into contact with the support member 16, the coating layer is deformed according to the shape of the bellows tube 10A, so that the frictional resistance between the flexible tube 10 and the support member 16 is increased. It is larger, and both rotate more firmly together.

When the bellows tube 10A abuts against the inner peripheral surface of the tapered hole portion 16b, its dimensions are set so that the upper end of the support member 16 is located near the top of the peak portion 10a on the most distal side. ing.

The upper end of the support member 16 is provided with a guide hole 11h.
An annular concave portion 16c is formed on the outer peripheral surface of the upper end portion which projects upward from the upper surface and faces the storage space 11j and faces the storage space 11j. An engagement member 19 is mounted in the recess 16c. A small annular projection 16d is formed at the upper end edge of the bottom surface of the concave portion 16 so that the engaging member 19 does not come off the concave portion 16c unnecessarily.

The engagement member 19 has a ring shape.
It is composed of a core member 19a and two coil springs 19b and 19c sequentially inserted outside the core member 19a. Heartwood 19a
Is made of a metal wire, is not a complete ring, is partially cut away, and has a substantially C-shape. Therefore, the core member 19a can expand and contract in diameter by elastically deforming. The coil spring 19b is made of a metal wire, and has a ring shape by joining both ends. The same applies to the coil spring 19c.
Therefore, the diameter of the engaging member 19 can be expanded and reduced as a whole, and the inner diameter (= the inner diameter of the coil spring 19c) in a natural state in which the elastic member is not elastically deformed is a state in which elasticity is maintained on the valley side with respect to the bellows tube 10A. The diameter is set so that it can make contact. In this embodiment, the inner diameter of the engagement member 19 in the natural state is substantially the same as the outer diameter of the valley 10b.

The thickness of the engaging member 19, that is, the coil spring 1
The coil diameter D of 9c is set to be slightly larger than the width of the annular recess 16c and almost twice the depth of the annular recess 16c. Therefore, the upper end of the engagement member 19 is formed in the annular recess 1.
6c protrudes upward, and the protruding upper end is
The spring 18 is pressed against the lower end surface of the upper main body 11A by the urging force of the spring 18. This prevents the support member 16 from moving upward.

The engagement member 19 has a half of the outer peripheral side projecting into the storage space 11j. Therefore, when the support member 16 moves downward (in the insertion direction of the flexible tube 10) against the urging force of the spring 18, the engaging member 19 is moved to the intersection (first engagement portion) between the guide hole 11h and the step surface 11i. (Stop portion) 11k and cannot move in the same direction.
When the support member 16 moves further downward in this state, the engagement member 19 moves upward relative to the support member 16 and gets over the protrusion 16d and comes off the annular concave portion 16c.

Next, a case where the flexible pipe 10 is connected to the connection joint having the above configuration will be described. When connecting the flexible tube 10 to the connection joint, the protection tube 10B is fitted so that the bellows tube 10A fits into the sealing material 13 after the connection.
Is cut in advance from its tip by a predetermined length.

When connecting the flexible pipe 10 to the joint body 11, first, the flexible pipe 10 is inserted into the mounting hole 14 from the upper end opening. Then, the side surface of the peak portion 10a located at the most distal end side abuts against the inner peripheral surface of the tapered hole portion 16b of the support member 16. Therefore, when the flexible tube 10 is further inserted, the support member 16 moves downward against the urging force of the spring 18. At this time, the engaging member 19 is also
6, the engaging member 19 is moved downward with the intersection 11
When it hits k, it can no longer move down.
Therefore, the flexible member 10 is further inserted to support the support member 1.
When the member 6 is further moved downward, the engaging member 19 moves upward relative to the support member 16. Then, it gets over the projection 16d and separates from the recess 16c.

The engagement member 19 detached from the support member 16
Is reduced in diameter by its own elastic force and fits into the valley 10b of the bellows tube 10A. At this time, since the inner diameter of the engaging member 19 in the natural state is formed to be substantially the same as the inner diameter of the valley 10b, the engaging member 19 fits into the valley 10b as deeply as possible.

The insertion of the flexible tube 10 is stopped, and the flexible tube 1 is stopped.
When the hand is released from zero, the support member 16, the flexible tube 10, and the engaging member 19 are moved upward (in the direction opposite to the insertion direction of the flexible tube 10) by the urging force of the spring 18. Then, when the engaging member 19 abuts against the tapered surface 11d of the upper main body 11A, the engaging member 19 cannot move upward any more, and furthermore, the flexible tube 10 and the support member 16 are prevented from moving in the same direction. You. Thereby, the flexible pipe 10 is connected to the joint body 11.

In the connected state, the protection cylinder 10B fits into the protrusion 12a of the sealing material 12, and the bellows tube 10A fits into the sealing material 13. By fitting the protection cylinder 10B into the protrusion 12a of the sealing material 12, it is possible to prevent rainwater or the like from entering the mounting hole 14 from the outside. Further, since the bellows tube 10A is fitted to the sealing material 13, the airtightness between the flexible tube 10 and the joint body 11 is ensured.

The airtightness between the flexible pipe 10 and the joint body 11 is doubled by forming a coating layer on the inner peripheral surface of the tapered hole 16b. That is, when the bellows tube 10A is simply brought into contact with the inner peripheral surface of the tapered hole portion 16b of the support member 16, the bellows tube 1A
Since the cross-sectional shape of 0A is not a perfect circle but an elliptical shape, for example, a slight gap occurs between the bellows tube 10A and the inner peripheral surface of the tapered hole 16b. However, if a coating layer made of a flexible resin is formed on the inner peripheral surface of the tapered hole portion 16b, the coating layer is deformed according to the shape of the bellows tube 10A, so that a gap is formed between the bellows tube 10A and the tapered hole portion 16b. Does not occur. Therefore, airtightness can be ensured also here.

In the above connection joint, the engagement member 19
Is not near the top of the peak 10a of the flexible pipe 10, but is in the valley 1
Since the contact is made on the 0b side, even if the flexible tube 10 is strongly pulled outward, the engaging member 19 does not come off from the valley portion 10b, and the peak portion 10a of the flexible tube 10 passes through the engaging member 19. Can be reliably prevented. Therefore, the reliability of the connection can be improved.

In particular, in this embodiment, the diameter of the tapered surface 11d, which is the second locking portion, decreases in the direction opposite to the insertion direction of the flexible tube 10, so that the engaging member 19 abuts there. And the engaging member 19 is pushed radially inward to prevent the engaging member 19 from expanding in diameter. Therefore, the engagement member 19 can be more reliably prevented from coming off the valley 10b, and the connection strength can be further improved.

Further, since the diameter of the engaging member 19 is reduced by its own elastic force, the above-mentioned tapered hole in the conventional connection joint is not required. Therefore, the joint body 11 can be shortened.

When the engaging member 19 is detached from the support member 16 and fits into the valley 10b of the flexible pipe 10, the diameter of the engaging member temporarily increases to get over the projection 16d. For this reason, the insertion resistance of the flexible tube 10 increases. And
When the engaging member 19 gets over the projection 16d, the insertion resistance is rapidly reduced. It is possible to confirm that the flexible tube has been inserted to a predetermined position by the increase and sudden decrease of the insertion resistance. Moreover, when the engaging member 19 is detached from the supporting member 16, its elasticity causes the diameter to be sharply reduced, so that the engaging member 19 collides vigorously with the flexible tube 10. At that time, an impact sound is generated, and the vibration due to the impact is transmitted to the operator's hand via the flexible pipe 10. Therefore, the operator can more clearly confirm that the flexible tube 10 has been inserted to the predetermined position.

Further, in this embodiment, since the frictional resistance between the flexible tube 10 and the supporting member 16 is larger than the frictional resistance between the supporting member 16 and other members that come into contact with the supporting member 16, the flexible tube 10 is When rotated, the flexible tube 10 rotates relative to the joint body 11 together with the support member 16.
Therefore, even if the joint body 11 is rotated after the flexible pipe 10 is connected to the joint body 11, the flexible pipe 10 is not twisted, and the torsion stress is prevented from acting on the flexible pipe 10. it can.

By rotating the flexible tube 10 and the support member 16 integrally, the following effects can be obtained. That is, a coating layer is formed on the inner peripheral surface of the tapered hole portion 16b of the support member 16, and this coating layer is
By deforming according to the shape of A, the bellows tube 10A
And the inner peripheral surface of the tapered hole 16b. However, when the bellows tube 10A is rotated after the bellows tube 10A hits the inner peripheral surface of the tapered hole portion 16b,
Since the coating layer that has been once conformed to the shape of the bellows tube 10A is deformed again, the coating layer becomes the bellows tube 10A.
And the inner peripheral surface of the tapered hole 16b cannot be filled. For this reason, it becomes difficult to ensure airtightness.

In this regard, when the flexible tube 10 (the bellows tube 10A) and the support member 16 are integrally rotated, the coating layer conforming to the shape of the bellows tube 10A is not deformed again. . Therefore, flexible tube 1
It is possible to prevent airtightness from being impaired even when the joint body 11 and the joint body 11 are relatively rotated.

Next, another embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. In this embodiment, the same components as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. The embodiment shown in FIG. 3 has a thickness of 100 μm to 2 μm on a surface facing the upper side of the protrusion 16 a of the support member 16.
A seal layer 20 made of a resin or the like having a flexibility of about 00 μm is formed, and the protrusion 16 a is formed through the seal layer 20.
The end surface of the bellows tube 10A is brought into contact with the bellows. Since the bellows tube 10A is made to abut against the protruding portion 16a, the tapered hole portion 16b in the above embodiment is not formed in this embodiment.

In the connection joint of this embodiment,
On the inner peripheral surface following the tapered surface 11d of the upper main body 11A, a straight hole portion 111 having a uniform inner diameter is formed.
The inner diameter of the straight hole portion 11l is substantially the same as the outer diameter of the engaging member 19 fitted to the flexible tube 10, and the lower end portion extends below the center of the engaging member 19. Therefore, the straight hole portion 11l reliably prevents the engaging member 19 from expanding in diameter, and prevents the engaging member 19 from falling out of the valley of the flexible tube 10. Therefore, according to this embodiment, the connection strength of the flexible pipe 10 can be further improved.

It should be noted that the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the scope of the invention. For example, in each of the above-described embodiments, the engaging member 19 is provided with the core member 19 a and the two coil springs 19.
b, 19c, but of course other structures may be used. The present invention can also be applied to devices other than the connection joint, for example, a gas cock, a header, and the like. When applied to a gas cock, the joint body 11 of the above embodiment may be replaced with a gas cock body.

[0049]

As described above, according to the flexible pipe connecting apparatus of the present invention, the engaging member attached to the supporting member is detached from the supporting member by the first locking portion.
Since the elastic member is fitted into the ridge of the flexible tube by utilizing the elasticity, the engagement member is prevented from moving in the direction opposite to the insertion direction of the flexible tube by the second locking portion.
The connection strength of the flexible pipe can be improved without lengthening the connection device. In addition, since the projection is formed on the support member and the engaging member is separated from the support member after climbing over the projection, it can be easily confirmed that the flexible tube has been inserted to the predetermined position. And the like.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and FIG.
FIG. 1A is a longitudinal sectional view showing a state before connecting a flexible tube, and FIG. 1B is a longitudinal sectional view showing a state after connecting a flexible tube.

FIG. 2 is an enlarged sectional view of a main part of the embodiment shown in FIG. 1, and FIGS. 2A and 2B are FIGS.
(B).

FIG. 3 is an enlarged sectional view showing a main part of another embodiment of the present invention.

FIG. 4 is a half sectional view showing an example of a conventional flexible pipe connection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Flexible pipe 10A Bellows pipe 10a Crest part 10b Valley part 11 Joint main body (device main body) 11d Tapered surface (second locking part) 11k Intersection (first locking part) 14 Mounting hole 16 Support member 16d Projection 18 Spring (elastic member) 19 Engaging member

Continuation of the front page (56) References Japanese Utility Model Hei 1-75689 (JP, U) Japanese Utility Model Hei 3-91592 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 33 / 00 F16L 33/26 F16L 37/12

Claims (1)

(57) [Claims] 1. An apparatus body having a mounting hole into which a bellows-shaped flexible pipe having alternating peaks and valleys is inserted, and slidably and rotatably fitted in the mounting hole. A support member that is moved in the insertion direction by abutting the flexible tube inserted into the mounting hole, an elastic member that urges the support member in a direction opposite to the insertion direction of the flexible tube, and a radial direction. A ring-shaped engagement movably mounted on the outer periphery of the flexible tube side end of the support member in a state in which the support member has elasticity and the inner diameter is enlarged so as to be larger than the outer diameter of the mountain portion of the flexible tube; A support member on the inner surface of the mounting hole, by engaging the engagement member to prevent the movement of the engagement member in the same direction as the insertion direction of the flexible tube. Flexible tube When the engaging member is moved in the insertion direction, the engaging member is moved relative to the supporting member in a direction opposite to the moving direction to disengage from the outer periphery of the supporting member, and the engaging member is reduced in diameter by its own diameter. A first engaging portion fitted into the valley portion of the tube, and an engaging member engaged with the engaging member fitted into the valley portion of the flexible tube in a direction opposite to the insertion direction of the flexible tube. Second to block movement
And a projection is formed on the flexible tube side edge of the outer peripheral surface of the support member on which the engaging member is mounted.