JP2002310361A - Connecting joint for hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve strength against coming-off of a hose. SOLUTION: By locking a hose nipple 1 and a caulking pipe 3 incapably of axially moving by a first lock means 4, both of these nipple and pipe are axially integrally formed, and after a connecting end part 2a of a hose 2 is interposed between both the nipple and the pipe, by bag-fastening a cylindrical part 3a of the caulking pipe 3 diametrically contracted, an internal peripheral surface 2c of the connecting end part 2a of the hose 2 bites respectively axially incapably of moving relating to an annular recessed part 1a of the hose nipple 1 to integrally form it with the caulking pipe 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hose formed of a flexible material such as a synthetic resin such as a vinyl chloride resin or rubber or the like, which is immovably connected to a hose nipple of a fitting by a caulking pipe. Hose connection fittings. More specifically, the present invention relates to a hose connection joint in which a hose nipple and a hose are irremovably connected by inserting a connection end portion of an elastically deformable hose into the outer periphery of a hose nipple, covering these with a caulking pipe, and caulking the hose.

[0002]

2. Description of the Related Art Conventionally, as this kind of hose connection joint,
For example, as disclosed in Japanese Utility Model Publication No. 4-49437,
There is a hose nipple in which the outer peripheral surface on the distal end side is formed in a bamboo shoot shape, and the inner end of the caulking pipe is bent inward to form a mounting hole larger in diameter than the bamboo shoot portion. This one is
First, arrange the caulking pipe so as to cover the bamboo shoots of the hose nipple, then insert the connecting end of the hose between them and insert it into the hose nipple, or cover the outer circumference of the connecting end of the hose with the caulking pipe From the connection end of the hose nipple. Next, it is visually confirmed that the connection end of the hose is pushed into the back side of the caulking pipe and completely covers the bamboo shoot portion of the hose nipple by the through-hole formed in the inner peripheral surface of the caulking pipe. .
Finally, a manual hydraulic tool as disclosed in, for example, Japanese Utility Model Publication No. 4-44270 discloses an octagonal cross section of the intermediate portion of the caulking pipe and the joint end of the hose with respect to the bamboo shoot of the hose nipple. By tightening in all directions,
These caulked pipes and hoses are compressed and deformed, and the rebound resilience of the hoses prevents them from coming off.

[0003]

However, in such a conventional hose connection joint, the joint end portion of the hose compressed and deformed by caulking has rebound resilience at the beginning of the caulking joint. Although it sufficiently fulfills the function of preventing falling off, the rebound resilience gradually decreases with the passage of time, and particularly when used in a high-temperature environment, the rebound resilience rapidly decreases. Even if the rebound resilience of the hose is slightly reduced in this way, a gap is generated between the hose and the hose nipple, and the fluid in the hose leaks from this gap, and the work of dragging the hose and the inside of the hose are performed. When the fluid pressure rises, a trouble such as a hose coming off from the hose nipple is apt to occur, and there is a problem that its life is short and uneconomical. Further, since a mounting hole having a diameter larger than the outer peripheral surface on the distal end side of the hose nipple is formed in the back side of the caulking pipe, when the hose comes off from the hose nipple, the caulking pipe also comes off together.

An object of the present invention is to improve hose pull-out strength.
The second aspect of the present invention aims to further improve the hose pull-out strength in addition to the object of the first aspect of the present invention. The third aspect of the present invention has an object of simply attaching a caulking pipe to a hose nipple in addition to the object of the first or second aspect of the present invention. The invention described in claim 4 has the object of preventing fluid leakage for a long period of time irrespective of the decrease in the rebound resilience of a hose, in addition to the object of the invention described in claim 1, 2 or 3. is there.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention comprises a hose nipple 1 and a caulking pipe 3 which are connected to each other over the inner periphery of the inner side of the back side. First locking means 4 that locks immovably in the axial direction
And a plurality of annular concave portions 1a are provided at appropriate intervals in the axial direction on the outer peripheral surface on the distal end side of the hose nipple 1, and the cylindrical portions 3a of the caulking pipe 3 facing the annular concave portions 1a are respectively wrapped around the entire circumference. It is characterized in that the diameter is reduced by tightening. The second aspect of the present invention is the same as the first aspect of the invention, except that the second crimping pipe 3 is locked from the cylindrical portion 3a of the caulking pipe 3 to the outer peripheral surface 2b of the hose 2 so as not to move in the axial direction. It is characterized in that a configuration in which the locking means 5 is provided is added. Here, the second locking means 5 includes a through hole 5a formed in the caulking pipe 3 so as to bite into the outer peripheral surface 2b of the hose 2 compressed by bale tightening, and the second engaging means 5 is folded toward the outer peripheral surface 2b of the hose 2. The folding claw 5b of the caulking pipe 3 and the like. According to a third aspect of the present invention, in the configuration of the first or second aspect of the present invention, the first locking means 4 includes a concave portion 4a recessed in the circumferential direction and a ridge 4b adjacent to the distal end thereof. A notch 4c partially recessed, and a recess 4
a, and a convex portion 4d which is movable in and out in the circumferential direction. According to a fourth aspect of the present invention, in the configuration of the first, second or third aspect, an annular packing 1b elastically deformable is provided between the annular concave portions 1a.
Is provided so as to protrude from the outer peripheral surface on the distal end side of the hose nipple 1.

[0006]

According to the first aspect of the present invention, the hose nipple 1 and the caulking pipe 3 are immovably locked in the axial direction by the first locking means 4 so that they are integrated in the axial direction.
After the connecting end 2a of the hose 2 is sandwiched between the two, the cylindrical portion 3a of the caulking pipe 3 is tightened with a bale to reduce the diameter over the entire circumference, so that the hose 3 is connected to the annular recess 1a of the hose nipple 1. 2 inner peripheral surface 2c of connection end 2a
Are unmovably cut into each other in the axial direction to be integrated. According to a second aspect of the present invention, in addition to the configuration of the first aspect, a hose 2 is provided between the cylindrical portions 3a of the caulking pipe 3.
A second locking means 5 is provided over the outer peripheral surface 2b of the cylindrical portion 3a of the caulking pipe 3 so that the second locking means 5 is locked so as to be immovable in the axial direction. The outer peripheral surface 2b of the hose 2 is integrated. According to a third aspect of the present invention, in the configuration of the first or second aspect, the first locking means 4 includes a concave portion 4a which is recessed in a circumferential direction and a ridge 4b which is adjacent to a distal end thereof. A notch 4c recessed in the portion,
Since a convex portion 4d which can be moved into and out of the concave portion 4a through the notch portion 1c and is movable in the circumferential direction is added, the convex portion 4d is inserted into the concave portion 4a from the notch portion 4c and rotated to thereby obtain a convex portion. The portion 4d and the ridge 4b are locked so as not to move in the axial direction. The invention of claim 4 is the invention of claim 1, 2, or 3.
Since a configuration in which an elastically deformable annular packing 1b is disposed between the annular concave portions 1a so as to protrude from the outer peripheral surface on the distal end side of the hose nipple 1 is added to the configuration described above,
Even if the rebound resilience of the hose 2 is reduced, the reduction is compensated for by the repulsive force of the annular packing 1b, so that no gap is generated between the outer peripheral surface on the distal end side of the hose nipple 1 and the inner peripheral surface 2c of the hose 2.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIGS. 1 and 2, a cap nut N is rotatably attached to the back end of the hose nipple 1, and a rotation of the cap nut N causes a fluid supply source such as an air compressor (not shown). 1), a hose nipple 1 is connected and clamped, and a fluid such as compressed air is supplied to the hose 2.

The hose nipple 1 is shown in FIGS.
As shown in (a), for example, a cylindrical material is formed of a rigid material such as a metal or a hard synthetic resin, and a plurality of annular concave portions 1a are formed in the outer peripheral surface on the distal end side at appropriate intervals in the axial direction. Elastically deformable annular packings 1b are provided between the recesses 1a so as to protrude toward the inner peripheral surface 2c of the hose 2, respectively. In the case of the present embodiment, the annular packing 1 is inserted into an annular groove 1 c formed in the outer peripheral surface of the hose nipple 1.
b are fitted so that they cannot move in the axial direction.

The caulking pipe 3 is cylindrically formed of a rigid material such as aluminum which is deformed by a manually-operated hydraulic tool having a conventionally known structure but is not deformed by the repulsive force from the hose 2. 1a
The cylindrical portions 3a facing each other are bale-tightened over the entire circumference to reduce the diameter.

Further, a first locking means 4 is provided across the inner periphery of the inner side of the hose nipple 1 and the inner periphery of the inner side of the caulking pipe 3 so as to be opposed to each other and to be locked in the axial direction so as not to be movable. In the case of the present embodiment, the first locking means 4 includes a concave portion 4a having a width of, for example, about 3 mm, which is annularly recessed in the circumferential direction on the outer peripheral surface on the far side of the hose nipple 1 and a distal end side of the concave portion 4a. A pair of notches 4c recessed in a part of the adjacent ridge 4b,
4c, and a pair of convex portions 4d, 4d protruding from the inner periphery of the caulking pipe 3, which will be described later.

The outer peripheral surface 2b of the hose 2 extends from the peripheral surface on the distal end side of the caulking pipe 3 located between the cylindrical portions 3a.
, A second locking means 5 for locking each other so as to be immovable in the axial direction is provided. In the case of the present embodiment, the outer peripheral surface 2 of the hose 2 compressed by bale tightening is used as the second locking means 5.
A through hole 5a into which b bites is formed.

In the case of the illustrated example, a plurality of the through holes 5a are formed between the cylindrical portions 3a so that the through holes 5a have the same shape, for example, a rectangle, and have a good appearance while maintaining the strength of the caulking pipe 3. Are arranged obliquely in the axial direction. The perforated shape and perforated position of these through holes 5a are not limited to those shown in the drawings, and some or all of the through holes 5a are perforated into other shapes such as a polygon other than a rectangle or a circle, The through holes 5a may be arranged alternately in the axial direction, for example.

Next, a hose connecting procedure of the hose connecting joint will be described. First, from the disassembled state shown in FIG. 2A, the operator puts the protrusions 4d, 4d of the caulking pipe 3 from the cutouts 4c, 4c of the hose nipple 1 into the recess 4a and rotates the protrusions 4d. , 4d and the ridge 4b are immovably locked in the axial direction. Thereby, the hose nipple 1 and the caulking pipe 3 are integrated in the axial direction.

Thereafter, the connecting end 2 of the hose 2 is sandwiched between the hose nipple 1 and the caulking pipe 3.
Insert a.

During this operation, the operator looks through the through-holes 5a formed in the caulking pipe 3, and the connection end 2a of the hose 2 is pushed deep into the caulking pipe 3 so that the annular concave portions 1a of the hose nipple 1 are formed. And annular packing 1b
Visually confirm that… has been completely covered.

After this confirmation is completed, a manually-operated hydraulic tool having a conventionally known structure or the like is used to perform the operations shown in FIGS.
As shown in (b), the cylindrical portions 3a of the caulking pipe 3 are tightened in a bale to reduce the diameter over the entire circumference.

As a result, the inner peripheral surface 2c of the connection end 2a of the hose 2 with respect to the annular recess 1a of the hose nipple 1.
Respectively, bite immovably in the axial direction, and accordingly, the outer peripheral surface 2b of the connection end 2a is also entirely compressed and contracted. However, only the outer peripheral surface 2b 'of the connection end portion 2a facing the through hole 5a of the second locking means 5 is not reduced by the inner peripheral surface 3b of the caulking pipe 3, so that the outer peripheral surface 2b' passes through the through hole 5a. To swell.

As a result, the bulging portion 2b 'of the outer peripheral surface 2b of the hose is partially formed in the through hole 5a of the caulking pipe 3.
Bites in the axial direction and the circumferential direction so as not to be able to move, respectively, and these are integrated. As a result, the hose pull-out strength can be improved on the inner and outer peripheral surfaces of the hose 2, respectively, and even if the rebound resilience of the hose 2 decreases with time, the hose nipple 1
It is difficult for the hose 2 to come out together with the caulking pipe 3.

Further, in the case of the present embodiment, the first nipple 1 and the caulking pipe 3 are locked so as not to move in the axial direction.
The locking means 4 includes a notch 4 c formed in the recess 4 a and a ridge 4 b adjacent to the tip of the recess 4 a, and a protrusion 4 of the caulking pipe 3.
d, the protrusion 4d is simply inserted into the recess 4a from the notch 4c and rotated, so that the protrusion 4d and the protrusion 4d are formed.
b is immovably locked in the axial direction. As a result, there is an advantage that the caulking pipe 3 can be easily attached to the hose nipple 1.

Further, the annular concave portion 1 of the hose nipple 1 is provided.
a, the elastically deformable annular packing 1b is arranged so as to protrude from the outer peripheral surface on the distal end side, so that even if the resilience of the hose 2 is reduced, the reduction is compensated for by the repulsive force of the annular packing 1b. As a result, there is no gap between the outer peripheral surface on the distal end side of the hose nipple 1 and the inner peripheral surface 2c of the hose 2, and as a result, fluid leakage can be prevented for a long period of time irrespective of the decrease in the rebound resilience of the hose 2. There is.

On the other hand, FIGS. 3 and 4 show another embodiment of the present invention. The second locking means 5
Instead of the through-hole 5a, a folding claw 5b that cuts into the outer peripheral surface 2b of the hose 2 compressed by bale tightening is formed so as to be freely bendable between the cylindrical portions 3a.
2 is different from the embodiment shown in FIG. 2 and the other configuration is the same as the embodiment shown in FIG. 1 and FIG.

In the case of the illustrated example, a plurality of U-shaped cuts 5c are respectively opened in the circumferential direction between the cylindrical portions 3a of the caulking pipe 3, and the fold lines 5 are formed.
are arranged toward the tip end of the caulking pipe 3, and rectangular folding claws 5b projecting in the insertion direction of the hose 2 are respectively formed. The shapes and positions of the folding claws 5b are not limited to those shown in the drawings, and the folding claws 5b
May be perforated into other shapes such as a triangle other than a rectangle, or the folding claws 5b may be alternately arranged in the axial direction, for example.

Further, the folding claw 5b simultaneously tightens the cylindrical portion 3a of the caulking pipe 3 with the connecting end 2a of the inserted hose 2 to reduce the diameter thereof over the entire circumference, or After the bale tightening is completed, the hose is folded toward the outer peripheral surface 2b of the hose 2 along the folding line 5d.
The connection end 2a of the hose 2 may be inserted after being folded in advance.

As a result, the folding claws 5b bite into the hose outer peripheral surface 2b "facing each of them so as not to move in the axial direction, in particular, in the hose pulling-out direction, and at the same time to bite in the circumferential direction. Be transformed into

Therefore, in the embodiment shown in FIGS. 3 and 4, similarly to the embodiment shown in FIGS. 1 and 2, the hose pull-out strength can be improved on the inner and outer peripheral surfaces of the hose 2, respectively, and with the passage of time. Even if the rebound resilience of the hose 2 is reduced, there is an advantage that the hose 2 becomes difficult to come out of the hose nipple 1 together with the caulking pipe 3.

In the embodiment described above, a cap nut N is rotatably attached to the back end of the hose nipple 1, and the hose nipple 1 is connected to a fluid supply source such as an air compressor by rotating the cap nut N. Although the case where the hose nipple 1 is sandwiched is shown, the present invention is not limited to this, and the hose nipple 1 may be mounted in another structure.

Further, the first locking means 4 comprises a concave portion 4a of the hose nipple 1 and a cutout 4c formed in a protruding ridge 4b adjacent to the distal end thereof, and a convex portion 4d of the caulking pipe 3. However, the present invention is not limited to this, and although not shown, the concave portion 4a and the convex portion 4d are locked without forming the cutout portion 4c, or the concave portion is formed in the inner periphery of the back side of the caulking pipe 3. At the same time, a convex portion may be provided on the outer peripheral surface on the far side of the hose nipple 1.

[0028]

As explained above, according to the first aspect of the present invention, the hose nipple 1 is provided by the first locking means 4.
And the caulking pipe 3 are locked so as not to be able to move in the axial direction, so that they are integrated in the axial direction, and the connecting end 2a of the hose 2 is sandwiched between the two. And the inner peripheral surface 2c of the connecting end 2a of the hose 2 bites into the annular concave portion 1a of the hose nipple 1 so that the inner peripheral surface 2c cannot move in the axial direction. As a result, the hose pull-out strength can be improved. Therefore, even if the rebound resilience of the hose deteriorates over time, even if the rebound resilience of the hose weakens over time, the hose nipples This makes it difficult for the hose to come off together with the caulking pipe, preventing problems such as fluid leakage and hose coming off, and extending the life by that much, which is economical.

According to a second aspect of the present invention, in addition to the effect of the first aspect of the present invention, the space between the cylindrical portion 3a of the caulking pipe 3 and the outer peripheral surface 2b of the hose 2 is integrated by the second locking means 5. Therefore, the hose pull-out strength can be further improved.

According to a third aspect of the present invention, in addition to the effects of the first or second aspect, the convex portion 4d is moved from the notch portion 4c to the concave portion 4a.
By rotating it into the inside, the projection 4d and the ridge 4b
Is locked so that it cannot move in the axial direction, so that the caulking pipe 3 can be easily attached to the hose nipple 1.

The invention of claim 4 is the invention of claim 1, 2 or 3
In addition to the effects of the invention, even if the rebound resilience of the hose 2 decreases, the decrease is compensated for by the repulsive force of the annular packing 1b, and the gap between the outer peripheral surface on the distal end side of the hose nipple 1 and the inner peripheral surface 2c of the hose 2 is reduced. Since no gap is generated in the hose 2, fluid leakage can be prevented for a long period of time regardless of the decrease in the rebound resilience of the hose 2.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of a hose connection joint according to an embodiment of the present invention.

2 (a) is a partial exploded perspective view before assembling of FIG. 1, and FIG. 2 (b) is a partial perspective view after assembling.

FIG. 3 is a longitudinal sectional front view of a hose connection joint according to another embodiment of the present invention.

4A is a partially exploded perspective view before assembling of FIG. 3, and FIG. 4B is a partial perspective view after assembling.

[Explanation of symbols]

 Reference Signs List 1 hose nipple 1a annular concave portion 1b annular packing 2 hose 2a connection end 2b outer peripheral surface 2c inner peripheral surface 3 caulking pipe 3a cylindrical portion 4 first locking means 4a concave portion 4b ridge 4c cutout portion 4d convex portion 5 second locking means

Claims (4)

[Claims] A hose nipple (1) is formed by inserting a connection end (2a) of an elastically deformable hose (2) into the outer periphery of a hose nipple (1), covering these with a caulking pipe (3) and caulking. ) And the hose (2) are immovably connected to each other, wherein the hose connection joint is immovable in the axial direction with respect to the inner periphery of the back side of the hose nipple (1) and the inner periphery of the caulking pipe (3). A first locking means (4) for stopping is provided, and a plurality of annular recesses (1a) are recessed at appropriate intervals in the axial direction on the outer peripheral surface on the distal end side of the hose nipple (1). A hose connection joint characterized in that a diameter of a cylindrical portion (3a) of an opposing caulking pipe (3) is reduced by bale tightening over the entire circumference. 2. A cylindrical portion (3) of said caulking pipe (3).
2. A hose connection joint according to claim 1, further comprising second locking means (5) for locking the hose from being axially immovable with each other from between a) and the outer peripheral surface (2b) of the hose (2). 3. The first locking means (4) has a recess (4a) recessed in the circumferential direction and a cutout (4b) recessed in a part of a ridge (4b) adjacent to the distal end thereof. 3. The hose connection joint according to claim 1, comprising: 4 c); and a projection (4 d) which can be moved into and out of the recess (4 a) through the notch (1 c) and move in the circumferential direction. 4. An elastically deformable annular packing (1b) is provided between said annular recess (1a) and a hose nipple (1).
4. The hose connection joint according to claim 1, wherein the hose connection joint is provided so as to protrude from an outer peripheral surface on a tip side of the hose.