JPH0914555A - Pipe joint - Google Patents

Abstract

PURPOSE: To connect a pipe unit in a narrow space, by forming an outer collar in a separate unit from a female unit, and engaging the outer collar rotatably in the circumferential direction between both these outer collar and female unit. CONSTITUTION: Relating to a flow path of a female unit 1 serving as a base unit of a pipe joint, from a deep part side, an elastic unit 7 and an inner collar 8 supporting a pressing member 9 are successively arranged, to cover these members with an outer collar extended from the female unit 1, and also a tapered part 11 with a deep part side in a large diameter is formed in a outer collar tip end. The outer collar is formed in a separate unit from the female unit 1, to rotatably engage the outer collar in the peripheral direction between both the outer collar and female unit. Connecting the pipe joint 1 to a pipe unit 40 is performed by inserting the pipe unit 40 from a tip end of the inner collar 8 of the female unit 1. This operation is caused by contact of the pressing member, for instance, the ball 9 with a peripheral surface of the pipe unit 40, this ball 9 is put into contact with the tapered surface 11 of the outer collar by the elastic member 7, so as to hold connection between the pipe joint 1 and the pipe unit 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for piping of construction machines and machine tools, and is particularly suitable for connecting and disconnecting pipes with a narrow space where tools are difficult to use. It relates to a pipe joint.

[0002]

2. Description of the Related Art Conventionally, pipe fittings used for comparatively flexible synthetic resin or rubber pipes have been put into practical use which are relatively easy to connect and disconnect with the pipes. However, there are few pipe joints in which the same synthetic resin pipe body is relatively hard pipe body such as vinyl chloride hose or metal pipes, which can be freely connected and disconnected.

FIG. 15 shows an example of this type of pipe joint, which is a pipe joint for engaging the bite piece 32 with the pipe body 40 to perform the connection. In the figure, reference numeral 31 denotes a female body of a pipe joint, and the biting piece 32 is pressed into the surface of the tubular body 40 by a cap nut 33 screwed to the female body 31 to be coupled. However, in order to remove it, the bag-shaped nut 3
Even if 3 is loosened, the bite piece 32 cannot be easily disengaged from the tubular body 40, so that the tubular body 40 can hardly be detached. Even if it can be detached, the surface of the tubular body 40 will be damaged.
Therefore, when this is used again, it may become a flow path through which the fluid flowing in the tubular body leaks.

Under such circumstances, the present applicant has already proposed a pipe joint suitable for connecting and disconnecting a relatively hard pipe body (Japanese Patent Laid-Open No. 6-272795, etc.). FIG. 16 shows an outline of this already proposed technique, in which an inner collar 45 having a coil spring 43 and a ball 44 externally fitted is fitted to the large diameter portion 42 side of a female body 41 forming a base body of a pipe joint. These are covered with an outer collar 46 extending from the female body 41, and a taper surface 47 is formed on the outer collar 46 to form a ball 4
4 to prevent the inner collar 45 from coming off. In the figure, reference numeral 48 denotes an O-ring for sealing. However, when the tubular body 40 is inserted into the inner collar 45, the tip of the tubular body 40 hits the deepest portion (step portion) 49 of the large diameter portion 42, the position is determined, and the connection is completed. Then, when a force is applied to pull out the pipe body 40 or a fluid is passed through the pipe body 40, a force is applied in a direction in which the pipe body 40 is pulled out, but the ball 44 does not touch the outer collar 46. It is pressed by the par surface 47, and eventually the ball 44 presses the outer peripheral surface of the tubular body 40, which prevents the tubular body 40 from being pulled out. As described above, the connection with the pipe joint 40 is simple, and at the time of use, the function of preventing the detachment works.

On the other hand, in order to pull out (remove) the tube 40,
When the protruding end 45 ₀ of the inner collar -45'll push gently on the inside, Te - Pa - board was interposed between the outer surface of the face 47 and the tube 40 - inwardly with Le 44 inner collar -45 When the ball 44 is moved and the outer surface of the tube 40 is applied with a force, the ball 44 is released from the pressing force, and the tube 40 can be easily pulled out while maintaining this state.

[0006]

As described above, the pipe joints already proposed are relatively widely used because they have a relatively simple structure and can be easily connected and disconnected. However, even with this already proposed pipe joint, there are some aspects in which further improvement is required. That is, in the case of connection with a relatively narrow space, the pipe joint and the pipe body may be eccentric to each other, and measures against this case, absorption of oscillation during use,
Further, there are cases where measures against the rotational force of the pipe body are required, but the demand has not been met by the previously proposed pipe joint.

[0007]

SUMMARY OF THE INVENTION The present invention has been developed to add a function to the already proposed pipe joint in order to cope with the above-mentioned further demands, and its structure is as follows. . That is, the inner color supporting the elastic body and the pressing member is sequentially arranged from the deep side with respect to the flow path of the female body which is the base of the pipe joint, and the outer color extending from the female body covers them and the outer color extends. A pipe joint in which a taper portion having a large diameter on the deep side is formed at the distal end of the collar, the outer collar is formed separately from the female body, and the outer collar is provided between the outer body and the female body. The present invention relates to a pipe joint characterized in that it is rotatably engaged in the circumferential direction. The female body and the outer collar are not particularly required to have a sealing property. For example, the engaging surface can be engaged by a retaining ring, a hard ball, a caulking or the like.

[0008] Then, the projection of the tip of the tubular body inserted into the deep part of the flow path of the female body is formed so that the tubular body can be surely coupled by this, and normally, the female body is normally joined. One or a plurality of circumferential grooves are formed on the inner circumference of the flow passage of the body, and a sealing O-ring is fitted into the circumferential groove to completely seal between the tubular body and the groove.

Usually, the outer surface of the flow path of the female body is preferably covered with an outer collar, and both are engaged at this portion. Particularly preferably, the female covered with the outer collar. This is a pipe joint in which the tip of the outer surface of the body has a small diameter.

As the elastic body used in the present invention, a coil spring, a disc spring, and a cylindrical rubber elastic body are mainly used, which give an elastic support force to the inner color.
In this inner collar, the edge portion is preferably slightly projected from the tip end portion of the outer cover, and by pushing this, the function of separating the tubular body is given. Also,
The outer collar is made of synthetic resin or metal, and particularly in the inner collar, a taper hole having a large diameter on the outer peripheral surface side is bored, and a pressing member such as a hard ball ball is provided therein. It should be inserted. By providing a slit or recess in the inner collar, the outer diameter of which is large on the deep side and whose diameter can be reduced in the radial direction, the pull-out preventing force of the tube can be further increased.

[0011]

Since the present invention has the above-described structure, when the pipe joint and the pipe body such as the metal pipe are connected, the pipe body is inserted from the tip of the inner collar of the female body. Will be combined. This is because a pressing member, for example, a ball housed in the inner collar comes into contact with the outer peripheral surface of the tubular body, and this ball is pushed by the elastic body together with the inner collar toward the tip side of the inner collar. However, this ball comes into contact with the taper surface of the outer collar, and the pressing force is directed toward the surface of the pipe body, where the connection between the pipe joint and the pipe body is maintained. Become.

On the other hand, the detachment of the pipe body from the pipe joint is as follows. By pushing the tip of the inner collar inward in the coupled fitting and tube, the ball in contact with the taper surface of the outer collar is moved inward together with the inner collar. . That is, the contact between the ball and the outer collar is released, and the force pressing the surface of the tube is released. By pulling out the tube while maintaining this state, the two can be easily separated. It is a thing. Next, if the force for pushing the inner collar is loosened after detaching the tubular body, the inner collar is pushed again by the elastic body to return to the original state, and the joining and detaching of the tubular body are repeated here. It becomes.

The greatest feature of the present invention is the outer color.
Is formed separately from the female body, which is rotatable in the circumferential direction, and the outer collar can be slightly eccentric due to the lateral displacement of the engaging portion. Even if the pipe body is slightly eccentric with respect to the joint, it is possible to perform the above-mentioned coupling and disconnection without difficulty. In addition, because the outer collar is rotatable in the circumferential direction, the outer collar can follow the swing and rotation of the tube, absorbing these extra forces and significantly improving the durability performance. It is.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the pipe joint of the present invention will be described in more detail with reference to embodiments. FIG. 1 is a half sectional view showing a first embodiment of a pipe joint of the present invention. In the figure, reference numeral 1 denotes a female body forming a base of a pipe joint, and a flow path of a large diameter portion 3 is formed on the right side of a step portion 2 and a flow path of a small diameter portion 4 is formed on the left side. The inner surface of the large diameter portion 3 is provided with two circumferential grooves 5, 5, into which O-rings 6, 6 are fitted. A coil spring 7 and an inner collar 8 made of synthetic resin are provided on the edge of the large diameter portion 3.
Are placed together with the ball 9, and these are entirely
It is covered with 0. The outer collar 10 is extrapolated to the outer peripheral surface of the large diameter portion 3 of the female body 1, and has a tapered portion 11 with its leading end reduced in diameter. The female body 1
The stepped portion 2 provided at the deep portion of the pipe contacts the tip of the inserted tube 40, and whether the insertion of the tube 40 is complete depends on whether the tip of the tube 40 hits the stepped portion 2. It can be confirmed by whether or not.

There are various engaging means for engaging the outer peripheral surface of the large diameter portion 3 and the outer collar 10, but in the illustrated example, the outer peripheral surface of the large diameter portion 3 and the inner peripheral surface of the outer collar 10 are circumferentially grooved. 12 and 13 are formed, and the retaining ring 14 is fitted and locked therein. Therefore, the outer collar 10 can be rotated in the circumferential direction with respect to the large diameter portion 2 of the female body, and the outer collar 10 can be slightly eccentric with respect to the female body as shown in FIG. It is. still,
In the illustrated example, the outer edge at the tip of the large diameter portion 3 is slightly reduced in diameter, but it goes without saying that the eccentricity of the outer collar 10 is further smoothed by this.

FIG. 3 is a second embodiment of the pipe joint of the present invention, and is an enlarged view of a locking portion between the large diameter portion 3 and the outer collar 10, in particular. In this example, the peripheral groove 15 is formed on the outer peripheral surface of the large diameter portion 3.
The hole 16 and the circumferential groove 17 continuous with the hole 16 are formed in the outer collar 10, and the hard ball ball 18 is inserted through the hole 16 to show a locking method.

FIG. 4 shows a third embodiment of the pipe joint of the present invention, and is an enlarged view of a locking portion between the large diameter portion 3 and the outer collar 10, in particular. In this example, the peripheral step portion 19 is formed on the surface of the large diameter portion 3.
Is formed, and the inner tip 10 ₀ of the outer collar 10 is formed here.
This is an example of locking by tightening. Although not shown, a ridge may be used instead of the peripheral step portion 19.

The structure in which the outer collar 10 covers the outer peripheral surface of the large-diameter portion 3 of the female body 1 has been described above in detail, but it is needless to say that the invention is not limited to this. It is also possible to reversely fit the large-diameter portion 3 and the outer collar 10 as shown in FIG. 5 as a fourth embodiment, and employ the above-described locking method on the fitting surface. By the way, in FIG. 5, the outer collar 10 is covered by the tip of the large diameter portion 3, and the circumferential grooves 20, 21 are formed between them as shown in FIG. 1, and the retaining ring 22 is fitted therein. It shows a structure in which it is locked by locking.

In any of the above cases, the large-diameter portion 3 of the female body 1 and the outer collar 10 are formed separately, and are swingable and rotatable in the circumferential direction. It is very easy to insert the tube 40 into the tube 8 and, even in the state of use, the preferable result is obtained.

FIG. 6 is a cross-sectional view showing the relationship between the inner collar 8 and the ball 9, in which a taper-shaped hole 23 is bored from the outer peripheral side of the inner collar 8 and the ball is bored here. It has a structure in which the rule 9 is fitted. FIG. 7 is a sectional view showing the modification.

The connection and disconnection of the pipe joint and the pipe body will be described in more detail with reference to FIG. 1 as an example. FIG. 1 shows a case where the tube 40 is slightly inserted into the inner collar 8, and the position of the tube 40 is determined by the tip of the tube 40 hitting the step 2. Here, when a force is applied to pull out the tubular body 40 from this state, or when a fluid is flown in the tubular body 40 in this state, that is, when a force acts in the direction in which the tubular body 40 is pulled out, The ball 9 is pressed against the taper portion 11 side of the outer collar 10 by the elastic force of the coil spring 7, and the ball 9 is piped by the taper portion 11 of the outer collar 10. The surface of the body 40 is pressed, and the pipe 40 is prevented from being pulled out from the pipe joint.

[0022] Now, when leaving the tube 40 from the pipe joint, the tip 1 tip 8 ₀ shell -10 in said collar -8
It is more prominent than 0 ₁ and will be used. That is, the withdrawal of the tube 40, in which the tubular body 40 by pressing the tip 8 ₀ of the inner collar -8 in the direction of the female body 1 comes out. In other words, the protruding portion 8 _{0 of the} inner collar 8
By pressing, the inner collar 8 is moved to the female body 1 side, and the ball 9 is also moved together therewith, and the taper portion 1 is moved.
The tightening force due to the contact with the pipe 1 is released, and the pipe 4
0 can be easily pulled out from the female body 1.

[0023] Incidentally, in the relationship between the inner collar -8 and the outer shell 10, it is not necessary to tip 8 ₀ of the inner collar -8 necessarily protrudes, the female body 1 and the inner collar -8 externally It just needs to be able to move to the side. Figure 8 is a partial sectional view showing an example thereof, even the tip 8 ₀ of the inner collar -8 not protrude from the outer collar 10, may be Osere driver -24, etc., even small outside collar -10 Open the hole 25,
Here, the driver 24 or the like may be pushed in to move the inner collar 8 toward the female body 1.

The ball 9 is a taper portion 11 of the outer collar 10.
Is moved to the tube 40 side by the tube 4 as shown in FIG.
It will bite into the outer surface of 0. If excessive pressure or pull-out force is applied, the inner collar 8 will have a ball 9
Also, the inner diameter of the inner collar 8 is increased by the taper of the outer collar 10 in order to move to the smaller diameter side of the outer collar 10 following the pipe 40.
The portion 11 is placed on the side of the tubular body 40, and the tubular body 40 is gripped more firmly as shown in FIG.

Now, FIG. 11 is a front view of the inner collar 8 which is particularly effectively used in the present invention, and FIG. 12 is A- of FIG.
It is sectional drawing in the A line. That is, the inner collar 8 supports the ball 9 and forms recesses 26 at four locations on the outer surface side, and the inner collar of that portion is a thin portion 27. 13 and 14 are a front view and a sectional view of the inner collar 8 shown in FIGS. 9 and 10 when the inner collar 8 is subjected to excessive pressure or pulling force. In this case, the thin film portion 27 formed by the depression 26
Is bent to the outside 27 ₁ , which facilitates the diameter reduction of the inner collar 8. It has been found that in the joint using the inner collar having such a structure, the pressing material has a pullout preventing force which is about 1.5 to 2 times that of the joint having only the ball. The concave portion 26 of the inner collar 8 may have a complete slit shape without the thin film portion 27, but has a shape in which the thin film portion 27 is left so that the inner collar 8 is not deformed before the tube 40 is inserted. Are preferred.

[0026]

EFFECTS OF THE INVENTION By adopting the above-mentioned structure, the present invention enables free connection and disconnection of a tubular body having a high hardness, particularly in a narrow space. It becomes easy to put on and take off, and its industrial effect is extremely large.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a first embodiment of a pipe joint according to the present invention.

FIG. 2 is a side view of the pipe joint of FIG. 1;

FIG. 3 is a partial cross-sectional view showing a second embodiment of the pipe joint of the present invention.

FIG. 4 is a partial sectional view showing a third embodiment of the pipe joint of the present invention.

FIG. 5 is a partial sectional view showing a fourth embodiment of the pipe joint of the present invention.

FIG. 6 is a cutaway partial sectional view showing the relationship between the inner collar and the ball.

FIG. 7 is a cutaway partial sectional view showing another example of the relationship between the inner collar and the ball.

FIG. 8 is a partial cross-sectional view showing another relationship between an inner color and an outer color.

FIG. 9 is a partial cross-sectional view showing a usage state of the inner collar and the ball.

FIG. 10 is a partial cross-sectional view showing a usage state of the inner collar and the ball when an excessive pressure is applied.

FIG. 11 is a front view of an inner color used particularly effectively in the present invention.

12 is a cross-sectional view taken along the line AA of the inner color shown in FIG.

FIG. 13 is a front view showing a usage state of the inner collar shown in FIG. 11.

14 is a cross-sectional view taken along the line AA showing the usage state of the inner collar shown in FIG.

FIG. 15 is a half-cut sectional view showing an example of a conventional pipe joint.

FIG. 16 is a sectional view of a pipe joint already proposed by the applicant.

[Explanation of symbols]

1 ... Female body forming base of pipe joint, 2 ... Step portion of flow passage, 3 ... Large diameter portion of flow passage, 4 ... Small diameter portion of flow passage, 5 ... Inner surface of large diameter portion 3 circumferential groove, 6 ‥‥ O-ring, 7 ‥‥ coil springs, 8 ‥‥ in color -, 8 ₀ ‥‥ in color - the tip, 9, 18 ‥‥ hard ball - le, 10 ‥‥ shell -, 10 ₀ ‥‥ shell - the inner end (crimped portion), 10 ₁ ‥‥ shell - of the tip, 11 ‥‥ shell - Te - Pa - parts, the circumferential grooves of 12, 20 ‥‥ large diameter portion, 13, 21 ... Outer groove peripheral groove, 14, 22 ... Retaining ring, 15 ... Circumferential groove on outer peripheral surface of large diameter part, 16 ... Hole formed in outer color, 17 ... In hole 16 Continuous circumferential groove, 19 ... Large stepped portion on the surface of large diameter portion, 23 ... Ball accommodating hole on outer peripheral side of inner collar, 24 ... Driver, 25 ... Hole formed in outer collar , 26 ... Depression on the outer surface side of the inner color 27 ‥‥ inner shell - the thin-walled portion, 40 ‥‥ tube of.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiharu Nishimura 1-1-1, Kyobashi, Chuo-ku, Tokyo Bridgestone Flow Tech Co., Ltd.

Claims (6)

[Claims] 1. An inner color supporting an elastic body and a pressing member is sequentially arranged from a deep side with respect to a flow path of a female body which is a base body of a pipe joint, and these are arranged by an outer color extending from the female body. A pipe joint which is covered and has a taper portion having a large diameter on the deep side at the distal end of the outer collar, the outer collar being formed separately from the female body, and between the two. A pipe joint in which an outer collar is rotatably engaged in a circumferential direction. 2. The pipe joint according to claim 1, wherein a projection is formed in a deep portion of the flow path of the female body, the projection being in contact with the tip of the inserted pipe body. 3. The pipe joint according to claim 1, wherein a circumferential groove is formed in an inner periphery of the female body flow passage, and a sealing O-ring is fitted into the circumferential groove. 4. An outer color covers the outer surface of the flow path of the female body,
The pipe joint according to claim 1, wherein both are engaged at this portion. 5. The pipe joint according to claim 4, wherein the tip of the outer surface of the female body covered with the outer collar has a small diameter. 6. The pipe joint according to claim 1, wherein the outer diameter of the inner collar has a large diameter on the deep side and has a slit or a recess capable of reducing the diameter in the radial direction.