JPH10292888A - Retainer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retainer of a joint for flexible tube capable of preventing gas leaking as well as integrally setting plural inserts in a mold in the connected condition to each other, in forming of the retainer for flexible tube coupling. SOLUTION: A push ring 19 is screwed up to a tubular main body 11, and a retainer 26 is installed at the inner end part of the push ring 19. A flexible tube 37 is inserted in the push ring 19, and its end is projected a specific amount from the inner end of the retainer 26. The retainer 26 is formed in a ring form by a synthetic resin, and plural elastic projection pieces 28 are dividedly formed, to the inner end of the retainer 26. In each elastic projection piece 28, an insert made of a metal plate and having a claw engagable to the valley at the outer periphery of the tube 37 is embedded. The inserts are formed integrally by connecting expandable through connecting pieces. The push ring 19 is advanced by screwing, and the projecting end of the tube 37 is contacted closely to the abutting surface 15 in the tubular main body 11, by smashing the projecting end by the push ring 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retainer for a flexible tube joint used for gas piping and the like.

[0002]

2. Description of the Related Art As a conventional retainer of this type, for example, a retainer having a structure as shown in FIGS. 6 and 7 is known. In this conventional configuration, a cylindrical main body 51 is screwed to a pipe 52 made of gas or the like, and a contact surface 53 is formed therein. The pressing ring 54 is screwed into the cylindrical main body 51, and a retainer 55 is fitted on the inner periphery of the inner end. The flexible tube 56 is inserted into the press ring 54 in a state where the outer cover 57 is peeled off by a predetermined number of peaks (normally, four peaks),
The tip portion projects from the inner end of the retainer 55 into the tubular main body 51 by a predetermined amount (one mountain).

The retainer 55 is formed in a ring shape from a synthetic resin, and a plurality of elastic projections 58 are formed on the inner end thereof. Inserts 59 made of a metal plate are embedded in the respective elastic protruding pieces 58, and claw portions 60 capable of engaging with valleys on the outer periphery of the flexible tube 56 are formed on these inserts 59.

[0005] As shown in FIG. 5, the push ring 54 is screwed in a state in which the distal end of the flexible tube 56 protrudes by one peak, so that the protruding end of the tube 56 becomes the retainer 55. It is crushed between the claw portion 60 and the contact surface 53 of the tubular main body 51, and is brought into close contact with the contact surface 53. As a result, the flexible tube 56 is
Connected in an airtight manner.

[0005]

However, in this conventional retainer, as shown in FIG.
A plurality of inserts 59 buried therein are separately formed by press working or the like. For this reason, when setting a plurality of divided inserts 59 in a molding die and molding the retainer 55 with a synthetic resin, it is difficult to set each insert 59 and it takes time to set the insert. There was a problem.

As shown in FIGS. 6 and 7, a through hole 61 is formed at the center of each insert 59, and a concave portion 62 is formed at the base end edge. And the retainer 5
At the time of molding 5, the synthetic resin is inserted and hardened into the through hole 61 and the concave portion 62 so that each insert 59 is retained in the elastic protruding piece 58 of the retainer 55 so as not to come off. For this reason, the through hole 61 with respect to the insert 59
In addition, there is a problem that the concave portion 62 must be formed through, and the processing is troublesome and time-consuming.

The present invention has been made by paying attention to such problems existing in the prior art. A main object of the present invention is to provide a retainer in which a plurality of inserts can be integrally set in a molding die in a state of being connected to each other during molding, and the setting operation can be performed easily and in a short time. is there.

Another object of the present invention is to eliminate the necessity of forming through holes or recesses in the insert, thereby facilitating the processing of the insert.
An object of the present invention is to provide a retainer capable of securely holding an insert in an elastic projection piece.

[0009]

In order to achieve the above object, in the invention of the retainer according to the first aspect, a cylindrical main body having an abutting surface therein and a cylindrical main body are screwed. A plurality of claw portions, which are attached to the inner end of the push ring and are capable of engaging with the outer peripheral valley portion of the flexible tube, are provided with a flexible ring joint having a push ring and a flexible tube inserted into the push ring. A retainer having a ring shape made of a synthetic resin, a plurality of elastic protruding pieces divided at an inner end thereof, and a metal plate insert having a claw portion embedded in each elastic protruding piece. , Each insert is connected so as to be expandable via a connecting piece, and each of the inserts is provided with a leakage prevention portion extending from the claw portion to the outer peripheral side, and a joint surface is provided on the outer periphery from the contact surface in the cylindrical main body. ,Flexible Tube At the time of crushing, the leak prevention part of each insert is joined to the joint surface in the cylindrical body, and the end of the flexible tube inserted into the push ring is projected from the inner end of the retainer by a predetermined amount into the cylindrical body. In the state
By screwing the push ring, the protruding end of the flexible tube is crushed between the claw portion of the retainer and the contact surface of the tubular main body so as to come into close contact with the contact surface.

According to a second aspect of the present invention, in the retainer according to the first aspect, the outer peripheral edge is configured to be substantially flush with the outer peripheral edge of the leak preventing portion. According to a third aspect of the present invention, in the retainer according to the first or second aspect, a flow hole through which a resin material flows is provided in a peripheral wall of the insert.

[0011]

In the retainer according to the first aspect, when the retainer is formed, since the plurality of inserts are connected to each other through the connecting piece, the inserts are integrally inserted into the mold. Thus, it can be set at a predetermined position. Therefore, the work of inserting the insert into the mold can be performed easily and in a short time.

Further, in the retainer according to the second aspect, when the flexible tube is crushed, the leak preventing portion of each insert is joined to the joint surface in the tubular main body. By this joining, gas leakage can be more reliably prevented,
Even if the synthetic resin retainer is burned out in a fire or the like, a predetermined gas leakage prevention performance can be exhibited.

[0013] In the retainer according to the third aspect, the resin material forming the retainer passes through the central flow hole of the insert, and can easily and reliably flow into the groove on the inner peripheral edge of the retainer and harden.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the cylindrical main body 11 is screwed to a pipe 13 made of gas or the like at a male screw portion 12 at one end outer circumference, and a female screw portion 14 is formed at the other inner circumference. The annular contact surface 15 is formed at a central portion in the cylindrical main body 11, and a seal ring 17 is fitted in a groove 16 on the outer periphery thereof. Tapered surface 18 is female screw part 1
The cylindrical body 11 is formed on the inner peripheral surface between the groove 4 and the groove 16, and the inner diameter thereof gradually decreases toward the groove 16.

The cylindrical push ring 19 is formed with an external thread portion 2 on the outer periphery of the inner end.
At 0, it is screwed into the female screw portion 14 of the tubular main body 11, and a locking groove 21 is formed on the outer periphery of its inner end. The inner peripheral groove portion 22 is formed on the inner periphery of the outer end of the press ring 19,
A packing 23 is fitted in the groove 22. The outer peripheral groove 24 is formed at the center of the outer periphery of the press ring 19, and a seal ring 25 is fitted in the groove 24.

As shown in FIGS. 1 to 3, the retainer 26 is fitted around the inner end of the push ring 19. The retainer 26 includes a fitting portion 27 formed of a synthetic resin in a ring shape, and an elastic protruding piece 28 formed at an inner end of the fitting portion 27. An annular locking projection 29 is formed on the inner peripheral surface of the fitting portion 27, and the locking projection 29 is
The retainer 26 is locked and held on the outer periphery of the inner end of the press ring 19 by engaging with the locking groove 21 of the lock 9.

The four inserts 30 made of a metal plate are:
The retainer 26 is formed so as to be buried in each elastic protruding piece 28, and is formed integrally with the base end so as to be expandable by a thin plate-like connecting piece 31 so as to be arranged in a substantially cylindrical shape. I have. The groove 32 is formed on the inner peripheral surface of each insert 30 and extends in the circumferential direction.

The end of each insert 30 is provided with a leak preventing portion 34 projecting radially outward from its claw 33 so as to form a T-shaped cross section. The outer peripheral edge of the leak preventing portion 34 is set to be flush with the outer peripheral edge of the retainer 26, and the push ring 19 is screwed into the cylindrical main body 11 so that the protruding end of the tube main body 35 has a cylindrical shape. When crushed between the contact surface 15 of the main body 11, the leak prevention portion 34 comes into contact with the joint surface 36 of the tubular main body 11. The length of the tapered surface 18 of the tubular body 11 in the axial direction is such that the end of the tube body 35 of the flexible tube 37 projects from the inner end of the retainer 26 by one peak.

A flow hole 38 is provided at the center of each insert 30. When the retainer 26 is formed, the synthetic resin passes through the flow hole 38 from the outer circumference to the inner circumference of each insert 30. The insert 30 is inserted into the respective grooves 32 and hardened therefrom, so that the insert 30 is retained and retained in the elastic projection 28. Therefore, the retainer 26
During the molding of the resin material, the resin material can easily and reliably flow into each groove 32 and be hardened.

An annular joint surface 39 is formed on the end surface of the elastic protruding piece 28 of the retainer 26. When the retainer 26 is fitted on the outer periphery of the inner end of the press ring 19, the joint surface 39 is Is joined to the inner end face.

As shown in FIG. 1, the flexible tube 37 is composed of a bellows-shaped tube body 35 made of metal, and a synthetic resin jacket 40 coated on the outer periphery of the tube body 35. And the tube body 3
The flexible tube 37 is inserted into the push ring 19 in a state in which the jacket 40 has been peeled off from the end portion 5 by a predetermined number of peaks (for four peaks). At this time, the claw 33 of the retainer 26 is engaged with a predetermined valley on the outer periphery of the tube main body 35, and the end of the tube main body 35 is inserted into the cylindrical main body 11 from the inner end of the retainer 26 by a predetermined amount (1). Only).

As shown in FIG. 1 and FIG.
When the push ring 19 is screwed to the cylindrical main body 11, the push ring 19 is used by being detachably fitted to the outer periphery of the push ring 19. The spacer 41 is formed of a synthetic resin to a predetermined thickness, and a fitting recess 42 and a pair of elastic holding pieces 43 are formed below the spacer 41. The fitting of the spacer 41 restricts the screwing position of the push ring 19 to the cylindrical body 11 to a predetermined position. When the flexible tube 37 is inserted into the push ring 19 in this state, the tube body 35
Can be reliably projected from the inner end of the retainer 26 by one mountain.

Next, the operation of the retainer configured as described above will be described. Now, when connecting the flexible tube 37 to the tubular main body 11 using this flexible tube joint, first, the retainer 26 is attached to the inner end of the push ring 19 as shown in FIG.
At this time, the retainer 26 may be fitted to the outer periphery of the inner end of the press ring 19 while expanding the elastic protruding piece 28 of the retainer 26 against the elastic force, so that the work of attaching the retainer 26 is easy. Can be done.

Thereafter, a spacer 41 is provided on the outer periphery of the push ring 19.
Is fitted against the elastic force of the pair of elastic holding pieces 43.
In this state, the male screw portion 20 of the push ring 19 is connected to the cylindrical main body 11.
When screwed into the female screw portion 14 of the cylindrical body 1
1 is screwed into a predetermined position regulated by the spacer 41.

On the other hand, for the flexible tube 37, the jacket 40 is peeled off from the end of the tube body 35 by a predetermined number of peaks (for four peaks) in advance. In this state, when the flexible tube 37 is inserted into the push ring 19, the elastic projections 28 of the retainer 26 are expanded and deformed against the elastic force. Over the peaks and engage with the predetermined valleys. Then, the end of the tube main body 35 projects from the inner end of the retainer 26 into the cylindrical main body 11 by a predetermined amount (one mountain).

At this time, since the retainer 26 is fitted on the outer periphery of the inner end of the push ring 19, each elastic projection 28 of the retainer 26 is easily elastically deformed in the expanding direction. Further, as described above, since each elastic protruding piece 28 of the retainer 26 is easily elastically deformed in the expanding direction, even if the length of the elastic protruding piece 28 is shortened, the insertion of the flexible tube 37 into the push ring 19 is performed. Operation is not difficult. Therefore, the length of the joint in the axial direction can be shortened, and the entire joint can be reduced in size.

Thereafter, when the spacer 41 is removed from the outer periphery of the push ring 19 and the push ring 19 is screwed with respect to the cylindrical main body 11, as shown in FIG. The portion 34 engages with the tapered surface 18 in the tubular main body 11 and is deformed in the diameter reducing direction against its own elastic force. In this state, the protruding end of the tube main body 35 is crushed between the claw 33 of the insert 30 and the contact surface 15 of the tubular main body 11 as the push ring 19 advances. And
The end face of the crushed portion is in close contact with the contact surface 15 of the tubular body 11, and the outer peripheral edge of the crushed portion is in close contact with the seal ring 17 in the tubular body 11. Thereby, the flexible tube 37 is airtightly connected to the tubular main body 11, and gas leakage can be more reliably prevented.
Further, even when the synthetic resin retainer 26 burns due to a fire or the like, it is possible to prevent the insert 30 from rattling,
A predetermined gas leakage prevention performance can be exhibited.

At this time, since the length of the elastic protruding piece 28 of the retainer 26 is shortened and the length of each insert 30 is also shortened, when the protruding end of the tube body 35 is crushed,
There is no possibility that deformation such as twisting occurs in each insert 30. Further, since the joint surface 39 of the retainer 26 is in a state of being joined to the inner end surface of the press ring 19, the pressing force is effectively transmitted from the press ring 19 to the retainer 26. Accordingly, as the push ring 19 is screwed, a strong crushing force is applied to the protruding end of the tube body 35 from the joint surface 39 of the retainer 26 via each insert 30, and the protruding end is securely flattened. Can be crushed.

Further, since the length of the elastic protruding piece 28 of the retainer 26 is shortened as described above, even if the outer cover 40 of the flexible tube 36 is peeled off by four peaks in the same manner as in the conventional case, the retainer can be retained. The number of ridges of the tube body 35 protruding from the inner end of 26 can be secured for one ridge. For this reason, the number of peaks of the protruding end of the tube body 35 to be crushed is one, and the end face and the outer peripheral edge of the crushed portion are
It can be brought into close contact with the contact surface 15 and the seal ring 17 in the tubular main body 11. Therefore, the space between the flexible tube 37 and the cylindrical main body 11 can be sufficiently sealed.

As is apparent from the above description, the plurality of inserts 30 embedded in the retainer 26 are connected to each other via the connecting pieces 31. For this reason, when molding the retainer 26, these inserts 30 can be inserted integrally into a molding die and set at a predetermined position reliably. Therefore, the work of inserting the insert 30 into the mold can be performed easily and in a short time.

Further, a groove 32 extending in the circumferential direction is formed on the inner peripheral surface of the insert 30 embedded in the retainer 26. For this reason, the processing of the insert 30 can be performed easily as compared with the conventional configuration in which a through hole or a concave portion is formed through the insert. Further, at the time of molding the retainer 26 in this joint, the synthetic resin is inserted into the groove 32 of the insert 30 and hardened. Therefore, insert 30
Can be reliably retained and retained in the elastic protruding piece 28 of the retainer 26.

The present invention can be embodied with the following modifications. A locking projection 29 is formed on the outer periphery of the fitting portion 27 of the retainer 26 so that the retainer 26 is fitted on the inner periphery of the inner end of the press ring 19. In the configuration in which the plurality of inserts 30 are integrally connected by the connecting pieces 31, through holes and recesses are formed on each of the inserts 30 instead of the groove portions 32, and when the retainer 26 is formed, the through holes and the recesses are also formed. The synthetic resin should be inserted and hardened. With this configuration, the insert 30 can be more firmly held in the elastic projection piece 28. After the plurality of inserts 30 integrally connected by the connecting pieces 31 are integrally inserted into the mold, the connecting pieces 31
To form the insert 30 separately. The end of the tube main body 35 is configured to protrude from the inner end of the retainer 26 into the cylindrical main body 11 for two ridges.

The technical idea grasped from the above embodiment will be described below. The retainer according to claim 1, wherein the plurality of inserts, their connecting pieces, and the groove of each insert are formed by cutting. With this configuration, the insert can be easily formed.

[0034]

The present invention is configured as described above, and has the following effects. According to the first aspect of the present invention, at the time of molding the retainer, the plurality of inserts can be integrally set in the molding die while being connected to each other, and the setting operation can be performed easily and in a short time. be able to.

According to the second aspect of the present invention, gas leakage can be more reliably prevented, and a predetermined gas leakage prevention performance can be exhibited even in a fire or the like. According to the third aspect of the invention, the retainer can be formed easily and in a short time.

[Brief description of the drawings]

FIG. 1 is a partially broken side view showing a tube joint according to an embodiment.

FIG. 2 is a perspective view showing an insert according to the embodiment.

FIG. 3 is a sectional view taken along line 8-8 in FIG. 2;

FIG. 4 is a front view showing a spacer used for connecting a tube.

FIG. 5 is a partially broken side view of a state in which the pressing ring is tightened from the state of FIG. 1;

FIG. 6 is a partially broken side view showing a conventional flexible tube joint.

FIG. 7 is a perspective view showing an insert buried in a retainer of the joint.

[Explanation of symbols]

11 ... cylindrical body, 15 ... contact surface, 19 ... press ring, 26 ...
Retainer, 28 ... Elastic protrusion, 30 ... Insert, 31 ...
Connection pieces, 33: claw portion, 34: leakage prevention portion, 36: joining surface, 37: flexible tube, 38: flow hole.

Continued on the front page (72) Inventor Nobuhiko Hayashi 2nd 57, Tominaga, Miyama-cho, Yamagata, Gifu Prefecture (72) Inventor Toshio Shibuchi 2-10-16 Minamikagaya Suminoe-ku Osaka-shi, Osaka New (72) Inventor Kozo Nishiike 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka-shi Osaka Gas Co., Ltd. (72) Inventor Dai Oshihara 4-chome, Hirano-cho, Chuo-ku, Osaka, Osaka No. 2 Osaka Gas Co., Ltd.

Claims (3)

[Claims] 1. A joint for a flexible tube, comprising: a tubular main body having an abutment surface therein; a push ring screwed into the tubular main body; and a flexible tube inserted into the push ring. A retainer attached to the inner end of the push ring and having a plurality of claw portions engageable with a valley on the outer periphery of the flexible tube. A piece is divided and formed, and an insert made of a metal plate having a claw portion is embedded and formed in each elastic protruding piece, and each insert is connected so as to be expandable via a connecting piece, and the claw portion is connected to each of the inserts. In addition to providing a leak preventing portion extending to the outer peripheral side, a joining surface is provided on the outer periphery from the contact surface in the tubular main body, and when the flexible tube is crushed, the leak preventing portion of each insert is joined to the joining surface in the tubular main body. , Press With the end of the flexible tube inserted through the inside of the retainer protruding from the inner end of the retainer by a predetermined amount into the cylindrical main body, the push ring is screwed in, so that the projecting end of the flexible tube is attached to the retainer. A retainer configured to be crushed between the claw portion and the contact surface of the cylindrical main body so as to come into close contact with the contact surface. 2. The retainer according to claim 1, wherein an outer peripheral edge of the retainer is configured to be substantially flush with an outer peripheral edge of the leakage preventing portion. 3. The retainer according to claim 1, wherein a flow hole through which a resin material flows is provided in a peripheral wall of the insert.