JPH07110089A - Connection device for bellows pipe - Google Patents

Abstract

PURPOSE:To provide a connecting device for bellows pipes, which can easily insert a bellows pipe into a connection hole and moreover, can prevent the inserted bellows pipe from coming off from the connecting hole before connection, and the number of part items of which is small. CONSTITUTION:A cylindrical supporting member 7 is movably provided in the connection hole 1a. A ring-like projection 7a against which the crest section 3b of a bellows pipe 3A collides is formed in the inner peripheral surface of the end section in the side of the abutting section 1b of this supporting member 7. An engaging member 8 is secured in the side of the abutting section 1b of the supporting member 7 and the outer peripheral surface of the end section in the opposite side of the abutting section 1b with the diameter enlarged. In the inner peripheral surface, a stepped face 1f is formed to remove the engaging member 8 by making itself collide against the engaging member 8 is formed.

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 connecting a bellows tube which constitutes a flexible tube or the like.

[0002]

2. Description of the Related Art A conventional connecting device of this type is described in Japanese Utility Model Laid-Open No. 43590/1990. The connection device described in this publication uses a nut and a pair of retainers, and the bellows tube is inserted through the nut in advance,
Attach a pair of retainers to the tip of the bellows tube. Next, the pair of retainers and the bellows tube are inserted into the connection hole of the apparatus body, and the tip end surface of the bellows tube is abutted against the contact surface formed inside the connection hole. Then, tighten the nut and push the bellows tube through the pair of retainers. Then, the bellows tube is connected by tightening the nut until the 2-3 peaks of the bellows tube located between the retainer and the contact surface are crushed.

In the above connecting device, the handling of the pair of retainers is troublesome, so that there is a problem that it takes a lot of time and effort to connect the bellows tube.

In order to solve such a problem, Japanese Utility Model Laid-Open No. 3-75388, Japanese Utility Model Laid-Open No. 3-72190,
Those described in JP-A-4-125389 (hereinafter referred to as first, second and third conventional examples, respectively) have been proposed.

In the connecting device of the first conventional example, a ring whose inner diameter is larger than that of the bellows tube and whose diameter can be reduced is movably mounted inside the connecting hole, and a tapered surface is formed on the inner peripheral surface of the connecting hole. When the bellows tube is connected, the bellows tube is inserted into the connection hole until it abuts against the contact surface. At this time, the bellows tube penetrates the nut and the ring. next,
Tighten the nut and move the ring to the contact surface side. Then, the diameter of the ring is reduced by the tapered surface, and the ring is fitted into the valley portion of the bellows tube. Therefore, when the nut is further tightened, the nut pushes the bellows tube through the ring and crushes 2-3 peaks of the bellows tube between the ring and the contact surface. This connects the bellows tube.

In this connection device, since the inner diameter of the ring is larger than that of the bellows tube when the bellows tube is inserted into the connection hole, the bellows tube can be easily inserted into the connection hole. Moreover, the bellows tube can be connected simply by tightening the nut, and there is no need to handle the pair of retainers. Therefore, the bellows tube can be easily connected.

Further, in the connecting device of the second conventional example, instead of the ring of the first conventional example, a ring having an inner diameter smaller than the outer diameter of the peak portion of the bellows tube and larger than the outer diameter of the valley portion is used. The bellows tube can be expanded and contracted. Therefore, when the bellows tube is inserted into the connection hole, the crest portion of the bellows tube abuts on the inner peripheral surface of the ring, but the ring expands in diameter as the bellows tube is inserted and allows the insertion. After the tip end surface of the bellows tube hits the contact surface, connection is performed in the same manner as in the first conventional example.

Further, in the connecting device of the third conventional example, the bellows tube is mounted inside the connection hole in a state of being separated from each other so that the bellows tube can be inserted between the pair of retainers. Is inserted into the connection hole, the elastic member moves the pair of retainers close to each other so as to be attached to the outer periphery of the bellows tube. Other points are similar to those of the former two examples.

[0009]

In the first conventional example, since the inner diameter of the ring is larger than that of the bellows tube before tightening the cap nut, the bellows tube can be easily inserted. However, on the other hand, there is a problem that the bellows tube easily comes out of the connection hole.

In the second conventional example, the inner diameter of the ring is smaller than the peak of the bellows tube. Therefore, once the bellows tube is inserted into the connection hole, the bellows tube does not come out. However, when inserting the bellows tube into the connection hole, the bellows tube must be inserted while forcibly expanding the diameter of the ring, and a great amount of force is required to insert the bellows tube. Therefore, the operator's fatigue increases.

In the third conventional example, the bellows tube can be easily inserted into the connection hole, and at the same time, it can be prevented from coming out of the connection hole. However, another conventional example is 1
While one ring is used, a pair of retainers is used, and an elastic member is used to attach them to the bellows tube inserted into the connection hole. For this reason, there is a problem that the number of parts increases, the labor of assembly increases, and the manufacturing cost increases.

As a connecting device for easily connecting the bellows tube, there has been previously proposed a device which allows the bellows tube to be connected by simply inserting it into the connection hole (Japanese Patent Laid-Open No. Hei 5). -See Japanese Patent No. 164280). However, in the connecting device according to the above proposal, the tip portion of the bellows tube is not crushed, which is basically different from the invention of this application in this respect. And as a result of this,
In the above conventional example and the present invention, the airtightness between the bellows tube and the connection hole is secured by pressing the tip end surface of the bellows tube against the contact surface until the bellows tube is crushed. In the proposed connection device, the space between the inner peripheral surface of the connection hole and the outer periphery of the bellows tube is made airtight by the sealing material, and there is a possibility that the sealing material deteriorates with time and the airtightness deteriorates.

The present invention has been made to solve the above-mentioned problems, and in a connecting device in which the distal end portion of the bellows tube is crushed for connection, the bellows tube can be easily inserted into the connection hole. Moreover, it is an object of the present invention to provide a connecting device for a bellows tube, which can prevent the bellows tube from coming out of the connection hole before the connection, and further reduce the number of parts to reduce the manufacturing cost.

[0014]

In order to achieve the above object, the present invention has a connection hole into which a bellows tube is inserted, and the tip of the bellows tube abuts inside the connection hole. A device main body having a contact portion formed therein, and screwed to the device main body so as to move along the connection hole,
A pressing member that is relatively movably penetrated by the bellows tube and an inside diameter of the connection hole that is larger than the outside diameter of the bellows tube are arranged inside the connection hole, and the bellows tube is inserted into the connection hole. A pressing member formed at the tip of the pressing member, the engaging member being fitted into the bellows tube and having a diameter-reducing engagement member that fits into the valley portion of the bellows tube. In the connection device for a bellows tube, the tip portion of the bellows tube located between the engaging member and the abutting portion is crushed by pressing the bellows tube against the abutting portion by pressing with the above. Inside the connection hole, a supporting member having a tubular shape, into which the bellows tube is inserted, is provided movably toward the contact portion side, and one end inner circumference located on the contact portion side of the support member, When the bellows tube is inserted into the support part, the support part is abutted against the bellows tube. Is provided, and the engagement member is fitted to the outer periphery of the other end of the support member in a state where the diameter of the engagement member is expanded and relatively movable, and the support member is attached to the inner peripheral surface of the connection hole. By preventing the fitted engaging member from moving to the contact portion side, a locking portion is formed to separate the engaging member from the support member when the support member moves to the contact portion side. It has a feature.

In this case, for a reason to be described later, a small convex portion is formed on the edge of the outer periphery of the support member into which the engaging member is fitted so as to expand and ride over when the engaging member separates from the supporting member. Is preferably formed. Further, it is desirable that the pressing portion of the pressing member be formed in a tapered surface whose diameter increases toward the front side in the pressing direction. Further, it is desirable to form a tubular portion on the front side of the pushing portion in the pushing direction to accommodate the engaging member fitted in the bellows tube and prevent the diameter expansion thereof.

[0016]

When connecting the bellows tube, the bellows tube is inserted into the connection hole from the opening at one end thereof. The inserted bellows tube
The support member is abutted against the contact portion of the support member, and the support member is moved to the contact portion side. At this time, the engagement member fitted to the outer periphery of the support member is separated from the support member because the engagement portion prevents the movement of the engagement member toward the contact portion. Then, the engagement member contracts in diameter and fits into the valley of the bellows tube. After that, when the pressing member is screwed in, the pressing member presses the bellows tube through the engaging member. As a result, the tip portion of the bellows tube located between the engaging member and the contact portion is crushed, and the bellows tube is connected.

When a small convex portion is formed on the supporting member, the diameter of the engaging member is once enlarged so as to get over the small convex portion immediately before the engaging member is disengaged from the supporting member. As a result, the insertion resistance of the bellows tube increases. The insertion resistance decreases after the engagement member is disengaged from the support member. It is possible to detect that the engagement member is disengaged from the support member by the increase and decrease of the insertion resistance.

When the pressing portion of the pressing member is formed as a tapered surface, the tapered surface presses the engaging member so as to reduce its diameter. Therefore, it is possible to prevent the engaging member from coming off the bellows tube when the pressing member presses the engaging member. In particular, when the tubular portion that accommodates the engaging member is formed on the front side of the pushing portion, the tubular portion reliably prevents the diameter of the engaging member from expanding. Therefore, it is possible to more reliably prevent the engagement member from coming off the bellows tube.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows an embodiment of a connecting device for a bellows tube according to the present invention, and a connecting device A of this embodiment.
In the above, the bellows tube 3A of the flexible tube 3 including the bellows tube 3A and the jacket 3B is connected.

In FIG. 1, reference numeral 1 is an apparatus main body. A connection hole 1a is formed inside the apparatus main body 1 from the one end surface (right end surface in FIG. 1; left and right mean left and right in the drawing) on the center line to the left end surface. . A stepped surface (contact portion) 1b is formed in the middle portion of the inner peripheral surface of the connection hole 1a. A ring-shaped packing 2 is fixed to the step surface 1b. The inner diameter of the packing 2 is substantially equal to or slightly smaller than the inner diameter of the valley portion 3a of the bellows tube 3A of the flexible tube 3, and the outer diameter of the packing 2 is slightly smaller than the outer diameter of the peak portion 3b of the bellows tube 3A. Has become. A taper screw portion 1c is formed on the outer peripheral surface of the left end portion of the apparatus body 1 so as to be screwed into a gas appliance or the like.

A female screw portion 1d is formed on the inner peripheral surface of the right end portion of the connection hole 1a. A cylindrical pressing member 4 is screwed into the female screw portion 1d. This pressing member 4
A large diameter portion 4a is formed at the right end portion of the. A spacer 5 having a C-shaped expanded / contracted diameter is sandwiched between the large-diameter portion 4a and the apparatus body 1, and the pressing member 4 is positioned by the spacer 5.

A small diameter portion 4b having a smaller diameter than the other inner peripheral portions is formed on the inner periphery of the left end portion of the pressing member 4. The inner diameter of the small diameter portion 4b is slightly larger than the outer diameter of the bellows tube 3A, that is, the outer diameter of the mountain portion 3a. A tapered surface (pushing portion) 4c is formed at the opening of the small diameter portion 4b so as to expand in diameter to the left. On the other hand, an annular mounting groove 4d is formed on the inner peripheral surface of the right end portion of the pressing member 4, and a sealing material 6 made of an elastic material such as rubber is mounted in the mounting groove 4d. The sealing material 6 is for preventing rainwater and the like from entering the inside of the connection hole 1a from between the outer cover 3B of the flexible tube 3 and the pressing member 4.

A support member 7 is slidably mounted on the inner peripheral surface of the connection hole 1a between the pressing member 4 and the step surface 1b. The support member 7 has a tubular shape, and the inner diameter thereof is larger than the outer diameter of the bellows tube 3A. An annular protruding portion (abutting portion) 7a is formed on the left end portion of the inner peripheral surface of the support member 7. The inner diameter of the annular protruding portion 7a is slightly larger than the outer diameter of the packing 2 and slightly smaller than the outer diameter of the bellows tube 3A. Therefore, when the bellows tube 3A is inserted into the connection hole 1a, the peak portion 3b at the most distal end abuts on the annular protruding portion 7a, whereby the support member 7 moves together with the bellows tube 3A. Also, the annular protrusion 7
The thickness of a is smaller than the distance between the peak portion 3a and the valley portion 3b. When the smallest diameter portion of the valley portion 3a is made to be the tip of the bellows tube 3A, the annular protrusion 7a is crested. When the portion 3a abuts, the tip of the bellows tube 3A projects leftward from the support member 7.

A small diameter portion 7b is formed on the outer peripheral surface of the right end portion of the support member 7. An engagement member 8 is attached to the small diameter portion 7b. The engagement member 8 has a ring shape or a C shape, and can be expanded / contracted by its own elasticity. However, the engagement member 8 has rigidity such that the wire diameter does not change. Engaging member 8
Is attached to the small diameter portion 7b in an expanded state. Moreover, the engaging member 8 is movably attached to the small diameter portion 7b, and can be disengaged from the small diameter portion 7b by moving to the right. However, an annular small convex portion 7c is formed on the right end edge of the small diameter portion 7b, and the small convex portion 7c prevents the engaging member 8 from being unintentionally disengaged from the small diameter portion 7b.

An annular groove 1e is formed on the inner peripheral surface of the connection hole 1a facing the engaging member 8. This annular groove 1
When the engaging member 8 abuts on the left side surface (locking portion) 1f of e, the engaging member 8 is prevented from moving to the left. Therefore, when the support member 7 moves to the left, the engagement member 8 moves to the right relative to the support member 7 and disengages from the support member 7. When the engaging member 8 is disengaged from the support member 7, the engaging member 8 contracts in diameter and fits into the valley portion 3a of the bellows tube 3A.
In this case, when the engagement member 8 is disengaged from the support member 7, the distance from the locking portion 1f to the annular protruding portion 7a is appropriately set, so that at least one mountain from the tip of the bellows tube 3A (this implementation). In the example, it is 2 mountains) Valley 3a away
It is designed to fit in. The wire diameter of the engaged engaging member 8 is set so that almost half of the outer peripheral side thereof protrudes from the mountain portion 3b to the outside. In this embodiment, the engaging member 8 is the right side surface 1g of the annular groove 1e.
When you hit, you cannot move further to the right.

When the bellows tube 3A of the flexible tube 3 is connected in the connecting device A having the above-mentioned configuration, the bellows tube 3A is used.
The tip of the valley portion 3a has the smallest diameter. Further, the outer cover 3B is peeled off from the tip over a predetermined range.

Next, the flexible tube 3 is inserted into the connection hole 1a through the pressing member 4. When the peak portion 3b located at the most tip end of the bellows tube 3A hits the annular projecting portion 7a of the support member 7, the support member 7 moves to the step surface 1b side (left side) as the bellows tube 3A is inserted. At this time, since the engaging member 8 abuts on the left side surface (locking portion) 1f of the annular groove 1e, it moves to the right relative to the supporting member 7 and is separated from the supporting member 7. The engaging member 8 expands in diameter to get over the small convex portion 7c immediately before it is disengaged. Therefore, the insertion resistance of the bellows tube 3A increases. When the engaging member 8 separates from the supporting member 7, the insertion resistance decreases. By increasing or decreasing the insertion resistance of the bellows tube 3A, it is possible to detect that the engagement member 8 is separated from the support member 7.

When the engaging member 8 is disengaged from the supporting member 7, the engaging member 8 contracts due to its own elasticity and fits into the valley portion 3b of the bellows tube 3A. At this time, the engaging member 8 is the bellows tube 3A.
Impact sound is generated by hitting against. This impact sound can also detect that the engaging member 3A is detached from the support member 7 and fitted into the bellows tube 3A.
When the engaging member 8 is fitted in the bellows tube 3A, when the bellows tube 3A is pulled out, the engaging member 8 abuts on the tapered surface 4c of the pressing member 4 and can move further to the right. Disappear. Therefore, the bellows tube 3A
Will never come out. The engaging member 8 is the bellows tube 3A.
The insertion of the bellows tube 3A may be stopped when the bellows tube 3A is fitted in, or the bellows tube 3A may be inserted until the tip of the bellows tube 3A abuts on the packing 2 as shown in FIG.

Next, the spacer 5 is removed. in this case,
Since the spacer 5 has a C-shape and can be expanded in diameter, it can be easily removed from the cutout portion in the radial direction by expanding the cutout portion. Then, the pressing member 4 is screwed in and moved to the left. Then, the tapered surface 4c of the pressing member 4 hits the engaging member 8 and pushes the bellows tube 3A leftward via the engaging member 8. At this time, the tapered surface 4c prevents the engagement member 8 from expanding in diameter. Therefore, it is possible to prevent the engagement member 8 from coming off from the bellows tube 3A.

When the bellows tube 3A is pushed and moves to the left, and its tip end hits the packing 2, two peaks of the bellows tube 3A located between the engaging member 8 and the packing 2 are crushed. The bellows tube 3A is airtightly connected to the connection hole 1a of the apparatus body 1. In the connected state, the large-diameter portion 4a of the pressing member 4 abuts the apparatus body 1. Further, an O-ring 9 seals between the pressing member 4 and the apparatus body 1.

As is apparent from the above description, in the connecting device A, the engaging member 8 is expanded before the bellows tube 3A is inserted, so that the bellows tube 3A can be easily inserted into the connection hole 1a. You can Moreover, after the bellows tube 3A is inserted, the engagement member 8 automatically reduces its diameter and fits into the valley portion of the bellows tube 3A, so that the bellows tube 3A does not come out from the connection hole 1a. Further, the engaging member 8 is formed as one component, and is simply fitted to the outer periphery of the tubular supporting member 7. Therefore, the number of parts can be reduced, the structure can be simplified, and the manufacturing cost can be reduced.

Next, another embodiment of the present invention will be described.
In the embodiments described below, only parts different from the above embodiments will be described, the same parts are designated by the same reference numerals, and the description thereof will be omitted.

In the connection device B shown in FIG. 2, the packing 2 is fixed to the inner peripheral surface of the left end portion of the support member 7, and the support member 7 is pressed and moved by the bellows tube 3A via the packing 2. ing. That is, packing 2
However, instead of the annular projecting portion 7a of the above-mentioned embodiment, a contact portion is provided. In addition, in this connection device B, the annular groove 1
e is not formed, and a step surface (locking portion) 1h is formed instead of the side surface 1f of the annular groove 1g.

Further, in this connecting device B, the pressing member 4 is positioned by the locking ring 10, and
The pressing member 4 is prevented from being accidentally detached from the apparatus main body 1. That is, the locking ring 10 has a C-shape by cutting out a part thereof, and can be expanded and contracted. The inner half of the locking ring 10 is inserted into the annular groove 4e formed on the outer peripheral surface of the pressing member 4, and the outer half is inserted into the annular groove 1i formed on the inner peripheral surface of the connection hole 1a. I'm out.

Here, the width of the annular groove 4e and the annular groove 1i
The width at the bottom of the locking ring is approximately the same as the thickness of the locking ring 10. Therefore, the pressing member 4 is the locking ring 1
The movement is restricted by 0, and it is positioned by this. On the other hand, both side surfaces of the annular groove 1i are shown in FIG.
As shown in FIG. Therefore, when the pressing member 4 is rotated and moved with a relatively large force, the locking ring 10 is reduced in diameter by the side surface of the annular groove 1i and comes out of the annular groove 1i. Therefore, the pressing member 4 becomes movable.

The connecting device C shown in FIG. 3 is divided into a body portion 4A on the right side of the pressing member 4 and a cylinder portion 4B on the left end side for pushing the engaging member 8, and the cylinder portion 4B is rotated to the body portion 4A. Possible,
In addition, they are connected by the retaining ring 11. In this connection device C, since the tubular portion 4B is rotatable with respect to the main body portion 4A, when the main body portion 4A is screwed in, the rotation is not transmitted to the bellows tube 3A, and the bellows tube 3A rotates. Can be reliably prevented. Temporarily, bellows tube 3A
Although the packing 2 may be damaged by the bellows tube 3A when it is rotated, this inconvenience does not occur because the connecting apparatus C does not rotate the bellows tube 3A.

In the connecting device D shown in FIG. 4, the cylindrical portion 4B is positioned by the locking ring 10 '. In this case, although the locking ring 10 'has a circular cross section, a rectangular cross section may be used as in the locking ring 10 in the above embodiment. Further, the cylindrical portion 4B is
Although it is separable from the main body portion 4A, it may be connected inseparably.

In the connecting device E shown in FIG. 5, a vertical surface (pushing portion) 4f orthogonal to the axis of the pressing member 4 is formed in place of the tapered surface 4c, and the vertical surface 4f is formed.
A cylindrical portion 4g extending leftward from is formed. Tube part 4g
Accommodates the engagement member 8 therein, and the inner diameter thereof is substantially the same as the outer diameter of the engagement member 8 fitted in the bellows tube 3A. Therefore, the tubular portion 4
With g, it is possible to reliably prevent the engagement member 8 from expanding in diameter, and thus it is possible to reliably prevent the engagement member 8 from coming off from the bellows tube 3A.

The present invention is not limited to the above embodiments, but can be modified as appropriate without departing from the scope of the invention. For example, in the above example,
Although the apparatus main body 1 is connected by screwing the taper screw portion 1c into a gas appliance such as a gas stopper, the apparatus main body 1 may be formed integrally with the main body of the gas stopper, for example. Further, although the pressing member 4 is screwed onto the inner peripheral surface of the connection hole 1a, it may be screwed onto the outer peripheral surface of the pressing member 4.

[0040]

As described above, according to the connecting device for the bellows tube of the present invention, the supporting member movable by the bellows tube is provided inside the connecting hole, and the engaging member is expanded on the outer periphery of the supporting member. Supports the engagement member when the support member moves to the contact part side by fitting it in a diameter state and preventing the engagement member from moving to the contact part side on the inner peripheral surface of the connection hole. Since it is formed with a locking part to be separated from the member,
The bellows tube can be easily inserted into the connection hole, the bellows tube can be prevented from coming out of the connection hole before the connection, and the number of parts can be reduced to reduce the manufacturing cost. The effect of is obtained.

When the support member is formed with a small convex portion, it is possible to detect that the engaging member is disengaged from the support member and fitted into the bellows tube due to an increase or decrease in insertion resistance of the bellows tube. You can Further, when the pressing portion of the pressing member is formed into a tapered surface, it is possible to prevent the engaging member from coming off the bellows tube. In particular, when the tubular portion is formed in front of the pushing portion, it is possible to reliably prevent the engaging member from coming off the bellows tube.

[Brief description of drawings]

1 shows a connection device A according to the present invention.
FIG. 1A is a sectional view showing a state before connecting the bellows tube, FIG.
FIG. 1B is a sectional view showing a state in which the bellows tube is inserted until it abuts against the contact portion, and FIG. 1C is a sectional view showing a state in which the bellows tube is connected.

FIG. 2 shows a connection device B according to the present invention.
2A is a sectional view showing a state before connecting the bellows tube, FIG.
FIG. 2B is a sectional view showing a state where the bellows tube is connected, FIG.
FIG. 2C is an enlarged view of a C circle portion in FIG.

FIG. 3 is a cross-sectional view showing a connecting device C according to the present invention in a state in which a bellows tube is connected.

FIG. 4 is a cross-sectional view showing a connection device D according to the present invention before connecting a bellows tube.

FIG. 5 is a cross-sectional view showing a connecting device E according to the present invention in a state in which a bellows tube is connected.

[Explanation of symbols]

 A connection device for bellows tube B connection device for bellows tube C connection device for bellows tube D connection device for bellows tube E connection device for bellows tube 1 device body 1a connection hole 1b step surface (contact portion) 1e side surface (locking portion) 1h step surface ( Locking part) 3A Bellows tube 3a Valley part 3b Mountain part 4 Pressing member 4c Tapered surface (pushing part) 4f Vertical surface (pushing part) 4g Tube part 7 Supporting member 7c Small convex part 8 Engaging member

Front Page Continuation (72) Inventor Takashi Anamizu 404 Hyden, Kaya Noto-cho, 21 Noto-cho, Shinjuku-ku, Tokyo 404 (72) Toshio Saito 4-20-14 Toyohachi, Shinagawa-ku, Tokyo Koyo Industrial Co., Ltd.

Claims (4)

[Claims] 1. A device main body having a connection hole into which a bellows tube is inserted and an abutting portion against which a tip of the bellows tube abuts is formed in the connection hole, and a connection hole in the device main body. A pressing member that is screwed so as to move along, and is pierced so as to be relatively movable by the bellows tube,
The connecting hole is arranged inside the connecting hole in an expanded state in which the inside diameter is larger than the outside diameter of the bellows tube, and when the bellows tube is inserted into the connecting hole, the diameter is reduced and the bellows tube is fitted into the valley part. An engaging member capable of expanding and contracting, and pressing the engaging member fitted in the bellows tube with a pressing portion formed at the tip end portion of the pressing member to bring the bellows tube into contact with the contact portion. A connecting member for a bellows tube in which a tip portion of the bellows tube located between the engaging member and the abutting portion is crushed, wherein a tubular shape is formed inside the connection hole, and the bellows is formed inside. A support member into which the pipe is inserted is provided so as to be movable toward the contact portion side, and is supported along with the insertion of the bellows pipe by abutting the bellows pipe on the inner circumference of one end located on the contact portion side of the support member. A pad portion for moving the member is provided, and the outer periphery of the other end of the supporting member is provided. The engagement member is fitted in a relatively movable state with its diameter expanded, and the engagement member fitted to the support member is prevented from moving to the contact portion side on the inner peripheral surface of the connection hole. By doing so, the connecting portion for the bellows tube is characterized in that the engagement portion is formed to separate the engagement member from the support member when the support member moves to the contact portion side. 2. A small convex portion is formed at an outer peripheral edge portion of the support member into which the engaging member is fitted so as to expand and ride over when the engaging member separates from the supporting member. The connecting device for a bellows tube according to claim 1. 3. The bellows tube connecting device according to claim 1, wherein the pressing portion of the pressing member is formed into a tapered surface whose diameter increases toward the front side in the pressing direction. 4. A tubular portion is formed on the front side of the pushing portion in the pushing direction, for accommodating the engaging member fitted in the bellows tube and preventing the diameter expansion thereof. Item 1
The connection device for a bellows tube according to any one of 1 to 3.