WO2011037267A1

WO2011037267A1 - Hose joint

Info

Publication number: WO2011037267A1
Application number: PCT/JP2010/067012
Authority: WO
Inventors: 正世良
Original assignee: Sera Sho
Priority date: 2009-09-25
Filing date: 2010-09-22
Publication date: 2011-03-31
Also published as: JP2011069484A

Abstract

Disclosed is a hose joint by which clamping of a hose is maintained for a long period of time without applying a shear stress to an elastic body. An annular attachment portion (2c) is formed in a recessed manner on the inner peripheral surface (2a) of an expandable sleeve (2), and an annular elastic body (4) is provided so as not to move in the axial direction but to project toward the outer peripheral surface (H2) of a hose (H). The elastic body (4) is deformed by compression in the radial directions in accordance with a decrease in diameter of the expandable sleeve (2) between the expandable sleeve (2) and the outer peripheral surface (H2) of the hose (H), and the repulsion force of the elastic body (4) pushes the outer peripheral surface (H2) of the hose (H) toward the outer peripheral surface (1a) of a nipple (1). Thus, even if the elastic force and the thickness of the hose (H) are reduced due to long-term use, etc., the inner peripheral surface (4a) of the elastic body (4) is projected by the repulsion force of the elastic body (4) in accordance with this reduction and, accordingly, the inner peripheral surface (H1) of the hose (H) is brought into close contact with the outer peripheral surface (1a) of the nipple (1). Thus, the clamping of the hose (H) is always maintained.

Description

Hose fitting

The present invention provides a hose through which a fluid such as water or oil, a gas such as air, or a fluid passes, such as a hose joint used for connecting a pipe, particularly a heat resistant material which can pass even a high temperature fluid such as hot water. It relates to an excellent hose fitting.

Conventionally, as a hose joint of this type, a pressing sleeve having a tapered inner peripheral surface between a cylindrical nut receded by a screw formed on the outer periphery of the base of the nipple and an expansion sleeve positioned on the outer peripheral side of the hose An elastic body made of a rubber flat packing is provided between the pressing sleeve and a flange formed on the inner circumferential tip of the cylindrical nut on the inner circumferential side of the cylindrical nut, and the axial direction of the cylindrical nut is rotated. By retracting backward, the elastic body pushed by the flange of the cylindrical nut pushes the pressure sleeve rearward in the axial direction, and the diameter of the expansion and contraction sleeve is reduced by the tapered inner peripheral surface to clamp the hose, There is one in which the clamp state can always be maintained even if the elastic force of the hose itself is lost due to use or the like (see, for example, Patent Document 1).

JP-A-7-27273 (page 3, FIG. 1)

However, in such a conventional hose joint, since the elastic body is axially supported by the flange of the cylindrical nut, shear stress is applied to the elastic body pressed against the flange when the cylindrical nut is rotated to retract. The elastic body is easily twisted and deformed, and there is a possibility that the rotational resistance of the cylindrical nut may be increased due to the repulsive force thereof, and strong tightening may not be possible. There is a problem that the torsional deformation of the body is restored and the tightening by the cylindrical nut is weakened.
In addition, since the elastic body is attached inside the cylindrical nut, it is difficult to attach the elastic body at a fixed position, which makes it difficult to attach the elastic body, and furthermore the installation state of the elastic body is hidden by the cylindrical nut Since it is difficult to confirm the presence or absence, there is also a problem that an attachment error of the elastic body is likely to occur.
An object of the present invention is to address such a problem, and to maintain a clamped state of a hose for a long time without a shear stress acting on an elastic body, and an expansion and contraction sleeve by rotating a clamp. To reduce the diameter of the hose smoothly without twisting it, to facilitate insertion of the hose into the nipple and to increase the pull-out strength of the hose while making sure of sealing, to secure a large amount of compressive deformation of the elastic body, etc. It is

In order to achieve such an object, the present invention provides a nipple into which a hose is inserted, and an expansion / contraction sleeve which is provided on the outer peripheral surface of the nipple with the hose interposed therebetween and is formed so as to be elastically deformable in the radial direction. A fastener which is provided on the outside of the expansion sleeve and which is axially movably supported with respect to the expansion sleeve, and which is provided on the opposing surface of the expansion sleeve and the fastener, the expansion sleeve and the fastener A sleeve diameter reducing means for reducing the diameter of the expansion sleeve by moving the sleeve in the axial direction and for bringing the inner peripheral surface of the hose into close contact with the outer peripheral surface of the nipple; and the inner peripheral surface of the expansion sleeve An annular attachment portion is formed in a concave shape, and an annular elastic body is provided so as not to move in the axial direction and to protrude toward the outer peripheral surface of the hose, and the elastic body is formed of The hose is arranged so as to be compressed and deformed in a radial direction with the outer peripheral surface of the hose by its diameter and to press the outer peripheral surface of the hose toward the outer peripheral surface of the nipple by its repulsive force. It is
In addition to the features described above, the clamp is axially movably screwed on the nipple, and a pressing sleeve is rotatably provided on the inner periphery of the clamp, and the sleeve diameter reducing means includes the pressing It is characterized in that a configuration in which a tapered pressurized inner peripheral surface in sliding contact with the outer peripheral surface of the expansion and contraction sleeve is formed is added to the inner periphery of the sleeve.
Furthermore, in addition to the above-described features, an annular recess is formed on the outer peripheral surface of the nipple in such a manner as to be opposed to the elastic body.
Further, in addition to the above-mentioned features, it is characterized in that the surface of the elastic body is provided with a configuration in which a recessed groove portion into which the deformed portion is inserted as the elastic body is compressed and deformed.

According to the present invention having the above-mentioned features, the annular mounting portion is formed in a concave shape on the inner peripheral surface of the expansion and contraction sleeve so that the annular elastic body can not move in the axial direction and protrudes toward the outer peripheral surface of the hose. By compressing and deforming the elastic body radially with the outer peripheral surface of the hose along with the diameter reduction of the expansion and contraction sleeve, and pressing the outer peripheral surface of the hose toward the outer peripheral surface of the nipple by the repulsive force of the elastic body. Even if the elastic force of the hose itself decreases and becomes thin due to long-term use, etc., the inner peripheral surface of the elastic body protrudes due to it, and the inner peripheral surface of the hose adheres to the outer peripheral surface of the nipple Since the clamping state of the hose is always maintained, the clamping state of the hose can be maintained for a long time without the shear stress acting on the elastic body.
As a result, the rotation acts directly on the elastic body even if the tightening tool is rotated to reduce the diameter of the expansion sleeve as compared with the conventional one in which the elastic body is subjected to shear stress and is easily twisted by the rotation of the cylindrical nut. As it is not twisted and deformed, it is possible to perform reliable rotational tightening.
In the past, when elastic force of the hose itself decreased and became thin due to long-term use etc., as a countermeasure, so-called additional tightening work was performed in which the tightening tool was further rotated and tightened. No work is required, and maintenance can be improved.
In addition, since the attaching operation of the elastic body is easy and the attaching state of the elastic body can be easily confirmed by visual observation, it is possible to prevent the attaching error of the elastic body.
Further, the clamp is screwed on the nipple so as to be movable in the axial direction, and a pressure sleeve is rotatably provided on the inner periphery of the clamp, and the sleeve diameter reducing means is on the inner periphery of the pressure sleeve. In the case of forming a tapered pressurized inner peripheral surface in sliding contact with the outer peripheral surface of the expansion / contraction sleeve, the pressure sleeve is maintained without rotation and the repulsive force of the elastic body regardless of the rotation operation of the fastener. Since the expansion sleeve is pushed in the opposite direction in the axial direction, and the outer peripheral surface is in sliding contact along the tapered pressurizing inner peripheral surface of the pressing sleeve to reduce the diameter, the expansion sleeve is twisted by the rotation operation of the fastener. The diameter can be reduced smoothly without being
As a result, there is no sense of resistance in the rotation operation of the fastener, and the hose connection operation can be easily performed.
Furthermore, when an annular recess is formed on the outer peripheral surface of the nipple so as to face the elastic body, the hose can be smoothly inserted into the outer peripheral surface of the nipple without resistance and the hose is Since it is pushed and bent toward the outer peripheral surface of the nipple and the inner peripheral surface is in close contact with the recess of the nipple, insertion of the hose into the nipple can be facilitated and the hose can be enhanced in strength while being reliably sealed.
Further, when the recessed groove portion is formed on the surface of the elastic body, since the deformed portion enters the recessed groove portion when the elastic body is compressed and deformed, the amount of compressive deformation of the elastic body can be secured large.
As a result, the creep resistance performance of the hose can be further improved.

FIG. 1 is a longitudinal front view showing an embodiment of a hose joint according to the present invention, wherein (a) shows a state before movement of a fastener and (b) shows a state after movement of the fastener (c ) Indicates when the hose is thin.
FIG. 2 is a perspective view, and (a) shows the whole disassembled state, and (b) is a perspective view in which only the expansion and contraction sleeve is viewed from the reverse direction.
FIG. 3 shows a preparation step before assembly, in which (a) is a longitudinal front view and (b) is a perspective view.

In the embodiment of the hose joint A according to the present invention, as shown in FIGS. 1 to 3, the nipple 1 into which the connection end of the flexible hose H is inserted, and the connection end of the hose H to the outer peripheral surface 1 a of the nipple 1. , A clamp 3 provided on the outside of the expansion sleeve 2 and supported so as to be axially movable with respect to the expansion sleeve 2, and the opposing surfaces of the expansion sleeve 2 and the clamp 3 As a main component, a sleeve diameter reducing means is provided which is provided on the surface and which reduces the diameter of the expansion sleeve 2 by the mutual movement of the expansion sleeve 2 and the fastener 3 in the axial direction.
The sleeve diameter reducing means is configured such that, after the connecting end of the hose H is inserted into the outer peripheral surface 1 a of the nipple 1, the axial movement of the expansion sleeve 2 and the fastener 3, that is, tightening with respect to the expansion sleeve 2 The expansion sleeve 2 is reduced in diameter by moving the tool 3 in the axial direction, for example, the insertion direction of the hose H (hereinafter referred to as the hose insertion direction), or the direction opposite to the hose insertion direction of the hose H The expansion sleeve 2 is reduced in diameter by moving the expansion sleeve 2 in the opposite insertion direction in accordance with the drawing operation), whereby the inner peripheral surface H1 of the connection end of the hose H is nipple 1 It is in close contact with the outer peripheral surface 1a, and the hose H is connected so as not to be pulled out.
And, between the inner peripheral surface 2a of the expansion / contraction sleeve 2 and the outer peripheral surface H2 of the hose H, the elastic body 4 is provided immovably in the axial direction on the inner peripheral surface 2a of the sleeve 2 across them. .
The elastic body 4 compresses and deforms the elastic body 4 in a radial direction with the outer peripheral surface H 2 of the hose H as the diameter of the expansion and contraction sleeve 2 is reduced. The outer peripheral surface H2 is arranged to be further pressed and deformed toward the outer peripheral surface 1a of the nipple 1 so that the inner peripheral surface H1 of the hose H is in close contact with the outer peripheral surface 1a of the nipple 1.
The nipple 1 is formed in a cylindrical shape having an outer diameter substantially the same as or slightly larger than the inner diameter of the hose H, for example, with a hard material such as a metal such as brass or hard synthetic resin Is formed into a cylindrical shape with a thin wall thickness by pressing or other forming a plate material made of a rigid material, and the proximal end side of the hose insertion direction is the proximal end of the expansion sleeve 2 in the hose insertion direction described later An opposing annular abutment surface 1b is formed.
In the outer peripheral surface 1a of the nipple 1, it is preferable to form an annular recess 1c facing the elastic body 4 described later.
Furthermore, the open end 1d located at the end of the nipple outer peripheral surface 1a in the opposite direction to the insertion direction is inclined in a tapered shape gradually increasing in diameter toward the opposite direction, and the opposite outer peripheral surface in the hose insertion direction The slide means 1e is provided to support the clamp 3 to be described later in a reciprocating manner in the hose insertion direction and the counter insertion direction.
The expansion / contraction sleeve 2 is made of, for example, an elastically deformable material such as polyacetal resin or other synthetic resin having excellent surface slipperiness and heat resistance, and the inside diameter is formed in a substantially cylindrical shape slightly larger than the outside diameter of the hose H The inner peripheral surface 2a is substantially parallel to the outer peripheral surface 1a of the nipple 1, and as shown in FIGS. 2 (a) and 2 (b), the slit 2b extending in either or both the hose insertion direction and the anti-insertion direction By forming a plurality of notches in the circumferential direction, they are elastically and elastically deformed in the radial direction so that the diameter is expanded or reduced.
A mounting portion 2 c for positioning an elastic body 4 described later in the axial direction on the tip side of the inner peripheral surface 2 a of the expansion / contraction sleeve 2 opposite to the insertion direction faces the annular recess 1 c of the outer peripheral surface 1 a of the nipple 1. It is also possible to provide a plurality of mounting portions 2c in the hose insertion direction, if necessary.
The fastener 3 is formed of a material similar to the nipple 1 in a substantially cylindrical shape having an inner diameter larger than the outer diameter of the hose H, and the inner peripheral surface thereof is engaged with the proximal outer surface of the nipple 1 in the hose insertion direction. In addition, slide means 3a is provided for supporting reciprocably in the hose insertion direction and the counter insertion direction.
Furthermore, as the non-slip means 3b for rotation operation, for example, a plurality of flat portions engaged with a tool etc. may be formed on the outer peripheral surface of the fastener 3 in the circumferential direction as needed in the illustrated example. It is preferable to form the uneven portion of
On the opposing surfaces of the clamp 3 and the expansion sleeve 2, from the inner peripheral surface of the clamp 3 to the outer peripheral surface 2d of the expansion sleeve 2, the expansion / contraction sleeve 2 and the clamp 3 move in the axial direction. A sleeve diameter reducing means is provided to press the sleeve 2 radially to reduce the diameter.
As this sleeve diameter reducing means, either or both of the inner peripheral surface of the fastener 3 and the outer peripheral surface 2d of the expansion and contraction sleeve 2 opposed to each other and abutted against each other gradually decrease in inner diameter toward the opposite insertion direction. It is formed by being inclined in a tapered shape.
Further, as another example of the sleeve diameter reducing means, as shown in FIGS. 1 to 3, the pressing sleeve 5 is rotatably provided on the inner periphery of the fastener 3, and the expanding sleeve 2 is provided on the inner peripheral surface of the pressing sleeve 5. It is also possible to form a pressurized inner circumferential surface 5a which is inclined in a tapered shape in which the inner diameter gradually decreases in the direction opposite to the outer circumferential surface 2d.
The elastic body 4 is formed in an annular shape, for example, of a compressible material such as rubber, and the outer peripheral portion thereof is fitted to the attachment portion 2 c formed on the inner peripheral surface 2 a of the expansion and contraction sleeve 2 By arranging so as not to move, the inner peripheral surface 4a of the elastic body 4 is positioned so as to project toward the outer peripheral surface H2 of the hose H.
Furthermore, as shown in FIG. 2 (a), the elastic body 4 has its inner peripheral surface 4a curved in a substantially arc shape in cross section, and the elastic body 4 is compressed and deformed on the surface of the elastic body 4. It is preferable to form the concave groove 4b into which the bulging and deformed part enters.
On the other hand, the hose H is made of, for example, a soft synthetic resin such as vinyl chloride or a soft material such as silicone rubber, and it is preferable that the inner peripheral surface H1 and the outer peripheral surface H2 be flat.
A specific example thereof is a laminated hose in which a plurality or a single synthetic resin blade (reinforcing yarn) is spirally embedded as an intermediate layer between the transparent or opaque outer layer and the inner layer, or an intermediate layer A spiral reinforced hose integrated by spirally winding a band-shaped reinforcing material such as a rectangular or rectangular cross-section made of synthetic resin or metal and a linear reinforcing material such as a circular cross-section, thread-like reinforcement such as glass fiber or flame retardant fiber A braided reinforced hose in which a material is braided on the outer peripheral surface of a hose, a spiral reinforced hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape, a flexible synthetic resin hose having a single layer structure, or the like is used.
Hereinafter, an embodiment of the present invention will be described based on the drawings.

In this embodiment, as shown in FIGS. 1 (a) to (c), 2 (a) and 2 (b) and 3 (a) and 3 (b), an external thread portion is used as slide means 1e on the outer peripheral surface of the nipple 1. The inner screw portion is engraved as the slide means 3a of the inner peripheral surface of the clamp 3 facing the same, and the outer screw portion 1e and the inner screw portion 3a are screwed together to rotate the clamp 3 The clamp 3 and the pressing sleeve 5 are attached to the nipple 1 so as to be capable of reciprocating in the axial direction, and a pipe connection port of another device is provided on the proximal end side of the external thread 1e of the nipple 1 in the hose insertion direction. The case where the connection part 1f for connecting to (not shown) is provided in a row is shown.
In the illustrated example, the base outer peripheral portion of the nipple 1 on which the external screw portion 1 e is to be engraved and the nipple outer peripheral surface 1 a are formed in a concave shape, and the bottom portion thereof is used as the abutting surface 1 b of the nipple 1.
Furthermore, in the illustrated example, as shown in FIG. 2 (b), at the hose insertion direction proximal end 2 e of the expansion and contraction sleeve 2, a collar 2 f is formed which protrudes toward the outer peripheral surface 1 a of the nipple 1.
Then, a flange portion 3 c protruding toward the outer peripheral surface H 2 of the hose H is formed at the end in the opposite direction to the insertion direction of the fastener 3, and the outer peripheral surface of the pressing sleeve 5 disposed on the inner periphery of the fastener 3 By forming the locking step 5b and bringing the flange 3c and the locking step 5b into free sliding contact with each other, the pressing sleeve 5 is moved in the same manner as the clamp 3 is rotationally moved in the hose insertion direction. I try to interlock in the direction.
On the inner peripheral surface 4a and the outer peripheral surface of the elastic body 4, as shown in FIG. 2A, a plurality of concave grooves 4b are appropriately recessed in the circumferential direction at appropriate intervals to smooth the entire elastic body 4 in the radial direction It is elastically deformed.
Although not shown as another example, it is also possible to change the formation position of the concave groove 4b or to change the shape of the concave groove 4b.
In the case where an inner thread is formed on the inner peripheral surface of the tube connection port of another device connected to such a hose joint A, the connection portion 1f is formed with an outer thread corresponding thereto, and When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved.
In the case of the illustrated example, the nipple 1 is a cut product obtained by scraping a cylindrical material by, for example, cutting processing, and an external thread is cut at the proximal end in the hose insertion direction as a connection portion 1f.
Next, a method of connecting the hoses H by the hose joint A will be described according to the order of steps, and the effects obtained thereby will also be described.
First, from the disassembled state of the hose joint A shown in FIG. 2A, as shown in FIGS. 3A and 3B, the hose H is inserted into the clamp 3 and the pressing sleeve 5, and the cut surface H3 of the hose H The flange portion 2f of the hose insertion direction proximal end 2e of the expansion and contraction sleeve 2 abuts against the outer peripheral surface H2 of the hose H and is fitted into the attachment portion 2c of the inner peripheral surface 2a of the expansion and contraction sleeve 2 The pressure sleeve 5 is temporarily fixed by bringing the inner peripheral surface 4 a of the elastic body 4 into contact with the elastic sleeve 4.
Thereafter, as shown in FIG. 1A, the connection end of the hose H is inserted into the outer peripheral surface 1a of the nipple 1.
At this time, when the annular recess 1c is formed on the outer peripheral surface 1a of the nipple 1, there is an advantage that the hose H can be smoothly inserted without resistance.
In addition, there is also an advantage that the pull-out strength of the hose H can be increased by the step due to the annular recess 1c, and an unexpected drop of the hose can be prevented.
With the insertion of such a hose H, the cut surface H3 of the hose H abuts against the butting surface 1b across the flange portion 2f of the hose insertion direction proximal end 2e of the expansion / contraction sleeve 2, thereby inserting the hose H The work is finished.
In this state, the clamp 3 is rotated to screw the inner screw 3 a to the outer screw 1 e of the nipple 1.
Subsequently, as shown in FIG. 1 (b), when the fastener 3 is screwed in and moved in the hose insertion direction with respect to the nipple 1, the pressing sleeve 5 is moved in the same direction via the flange portion 3c of the fastener 3. The tapered pressing inner circumferential surface 5a contacts the tip outer circumferential surface 2d of the expansion and contraction sleeve 2 to press the expansion and contraction sleeve 2 in the radial direction.
Thereby, the tip outer peripheral surface 2d of the expansion and contraction sleeve 2 is radially pressurized by the tapered pressurizing inner peripheral surface 5a of the pressing sleeve 5 so as to be compressed and deformed, and positioned along the tip inner periphery of the expansion sleeve 2 The inner peripheral surface 4a of the elastic body 4 is in pressure contact with the outer peripheral surface H2 of the hose H, and the inner peripheral surface H1 of the hose is closely attached to the annular recess 1c of the outer peripheral surface 1a of the nipple 1 and clamped. Compress and deform in the radial direction.
At this time, since the flange portion 3c of the clamp 3 and the locking step 5b of the pressing sleeve 5 slidably contact with each other, the tapered pressurizing inner circumferential surface 5a of the pressing sleeve 5 and the outer circumferential surface of the expansion sleeve 2 The contact resistance of the pressure sleeve 5 makes no rotation, there is no shear stress in the expansion sleeve 2, and the diameter of the expansion sleeve 2 can be reduced smoothly while preventing the twist deformation.
Then, when the tightening tool 3 is screwed in, the connection work of the hose H is completed.
After that, when the elastic force of the hose H itself decreases due to creep due to long-term use or the like and the thickness dimension becomes thinner, as shown in FIG. The inner peripheral surface 4a protrudes.
Thereby, the inner peripheral surface 4a of the elastic body 4 is in pressure contact with the outer peripheral surface H2 of the hose H, and the hose inner peripheral surface H1 is closely attached to the annular recess 1c of the outer peripheral surface 1a of the nipple 1 and clamped. H clamp state is maintained.
As a result, even if the elastic force of the hose H itself decreases due to creep due to long-term use or the like and the thickness dimension becomes thin, so-called retightening operation of further rotating and tightening the tightening tool 3 becomes unnecessary.
Further, in such a clamped state of the hose H, the inner circumferential surface 4a is pressed against the recess 1c of the nipple 1 with the hose H interposed by the repulsive force of the elastic body 4.
As a result, the pinched portion H4 of the hose H is pushed and bent, and the inner peripheral surface H1 adheres closely to the concave portion 1c of the nipple 1. Therefore, an advantage is obtained that the pullout strength of the hose can be increased while sealing reliably. There is.
In the embodiment shown in the above, although the outer screw portion and the inner screw portion screwing each other are formed as the slide means 1e and 3a for moving the clamp 3 in the axial direction with respect to the nipple 1, it is not limited thereto. As long as the fastener 3 can be moved in the axial direction with respect to the sleeve 2, a structure other than a screw may be used.
Also, instead of reducing the diameter of the expansion sleeve 2 due to the axial movement of the fastener 3, the hose H is pulled out in the opposite direction to insert the expansion sleeve 2 along with the inner peripheral surface of the fastener 3 or the pressing sleeve It may be made to move along the pressurizing inner circumferential surface 5a of 5 in the opposite direction to be reduced in diameter.
Furthermore, the flange portion 2f formed to project from the proximal end 2e of the expansion sleeve 2 in the hose insertion direction is disposed so as to be sandwiched between the butting surface 1b of the nipple 1 and the cut surface H3 of the hose H Not shown, the cut surface H3 of the hose H is brought into direct contact with the abutment surface 1b of the nipple 1 without forming the flange 2f, and the expansion / contraction sleeve 2 is formed between the outside and the clamp 3. It may be arranged so as not to move.

A Hose joint 1 Nipple 1a Outer peripheral surface 1b Butt end surface 1c Recess 1d Opening end 1e Slide means (outer thread) 1f Connection part 2 Expansion sleeve 2a Inner peripheral surface 2b Split 2c Mounting part 2d Outer peripheral surface 2e Base end 2f 鍔Part 3 Fastening tool 3a Slide means (inner screw part) 3b Non-slip means 3c Flange part 4 Elastic body 4a Inner peripheral surface 4b Recess groove part 5 Press sleeve 5a Pressurized inner peripheral surface (sleeve diameter reducing means)
5b Locking step H Hose H1 inner circumferential surface H2 outer circumferential surface H3 cut surface H4 pinched part

Claims

A nipple into which the hose is inserted,
An expansion / contraction sleeve which is provided on the outer peripheral surface of the nipple with the hose interposed therebetween, and which is formed so as to be elastically deformable in the radial direction thereof;
A fastener provided on the outside of the expansion and contraction sleeve and axially supported movably against the expansion and contraction sleeve;
It is provided on the opposite surface of the expansion sleeve and the tightening tool, and the diameter of the expansion sleeve is reduced by the relative movement of the expansion sleeve and the tightening tool in the axial direction, and the inner peripheral surface of the hose is the nipple. And a sleeve diameter reducing means to be in close contact with the outer peripheral surface;
An annular attachment portion is formed in a concave shape on an inner peripheral surface of the expansion / contraction sleeve, and an annular elastic body is provided so as not to move in the axial direction and to protrude toward the outer peripheral surface of the hose.
The elastic body is compressed and deformed in a radial direction with the outer peripheral surface of the hose due to the diameter reduction of the expansion sleeve, and the outer peripheral surface of the hose is pressed against the outer peripheral surface of the nipple by its repulsive force. A hose coupling characterized in that it is arranged to
The clamp is screwed on the nipple so as to be movable in the axial direction, and a pressure sleeve is rotatably provided on the inner circumference of the clamp, and the sleeve diameter reducing means is formed on the inner circumference of the pressure sleeve. The hose joint according to claim 1, wherein a tapered pressurized inner peripheral surface is formed in sliding contact with the outer peripheral surface of the expansion and contraction sleeve.
The hose coupling according to claim 1 or 2, wherein an annular recess is formed on the outer peripheral surface of the nipple opposite to the elastic body.
The hose joint according to claim 1, 2 or 3, wherein a concave groove is formed on the surface of the elastic body, into which the deformed portion is introduced as the elastic body is compressed and deformed.