JPS6044684A - Pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to pipe fittings, and more particularly to nylon.

Suitable for use with flexible pipes made of polyurethane, etc., and in particular allows for smooth and reliable insertion and locking of the pipe, eliminating the risk of breakage or deformation of the locking body within the pipe joint. Regarding fittings.

Conventionally, various structures have been developed as pipe joints for connecting flexible pipes for transferring fluid.

This type of pipe joint has a plurality of pieces, for example four pieces, arranged on the inner wall of the joint body at equal intervals in the circumferential direction so as to fit inward from the insertion end of the pipe. When inserting a tube, the tip of the locking claw is pushed apart by the tube end to allow insertion of the tube, and when the tube is moved in the direction of removal, it does not sink into the outer wall of the tube due to frictional force, etc. Extraction is now prohibited.

In addition, when the tube is removed, a release means such as a release ring is separately provided to push out the tip of the locking claw and forcibly release it from digging into the outer wall of the tube.

In the conventional structure of the lock pawl of such a pipe joint, the lock pawl itself requires a certain degree of rigidity, so the lock pawl itself is formed with a relatively thick wall to ensure the necessary rigidity. In order to better stick to the outer wall of the tube, much attention was paid to the shape of the tip of the claw, for example, by shaping it into a sharp blade shape.

However, when formed as described above, the lock claw itself has rigidity and lacks elasticity, so once the blade of the lock claw slips on the outer wall of the pipe, the lock claw cannot easily follow the movement of the pipe. The problem is that the binding is extremely poor. The above disadvantages are particularly noticeable when the tube is made of a relatively hard material.

In order for the lock pawl to easily follow the movement of the pipe, the lock pawl itself needs to be formed thin, but it lacks rigidity.

In order to solve the above-mentioned problems, the inventor punched out a flat elastic body such as phosphor bronze in an annular shape, as shown in FIG. He proposed a locking body in which notches 1 and 2 were formed alternately and filed a patent application (Japanese Patent Laid-Open No. 81293/1983).

As shown in FIG. 2, this locking body 3 is fitted and held in a groove 6 provided in the guide ring 5 of the joint body 4, and has a notch 2 formed in the outer wall of the pipe 7 to be inserted. The inner diameter end edge of No. 3 is made to bite into it. Reference numeral 8 denotes an elastic sleeve, which abuts the inner diameter edge portion from inside to supplement the elasticity of the inner diameter edge portion. Reference numeral 9 denotes a release ring which, when pushed in in the axial direction when the back is removed, spreads out the inner diameter edge of the locking body 3, allowing the tube 7 to be removed.

Since the locking body 3 has a ring shape connected in a zigzag pattern, when the tube 7 is inserted and the inner diameter edge is pushed apart, reaction force of twisting near the inner diameter edge in the back pushing direction, etc. A strong spring characteristic unique to the ring-shaped shape is created. Therefore, even if the locking body 3 itself is formed into a thin wall shape, strong spring properties can be obtained in combination with the replenishment of elasticity from the elastic sleeve 8. Moreover, this spring property is different from conventional rigid ones, and is a so-called strong spring force, so after the tube is inserted, the tube can be easily pulled out along the outer wall of the tube even if it moves slightly in the direction. follow,
It embeds into the outer wall of the pipe to effectively prevent extraction, and
After being embedded in the outer wall of the tube, no more force than necessary is generated, and there is no problem such as the formation of penetration marks on the outer wall surface due to aging.

However, since the above-mentioned locking body 3 is formed into a flat plate shape as a whole, it has been found that there are the following difficulties. That is, as the tube 7 is pushed in, the inner diameter edge of the locking body 3 is pushed out using the outer diameter edge as a fulcrum, but this deformation occurs because the locking body 3 is flat. This will cover the entire area. To explain in more detail, when the inner diameter edge is pushed wider by the insertion of the tube, the notch 2 on the inner diameter edge tends to widen due to the tensile force acting on the zigzag connection, and conversely, the notch 1 on the outer diameter edge tends to widen. Narrowed down. As a result, when the inner diameter edge is pushed out, the outer diameter of the outer diameter edge becomes smaller, and when the tube 7 is pushed in, the fulcrum of the outer diameter edge in the groove 6 shifts as shown by the broken line in Figure 3. , the angle of inclination of the inner diameter edge with respect to the outer wall of the tube 7 becomes gentler than the set value,
Not only does the inner diameter edge not stick to the outer wall of the tube 7 that much, but there is also a risk that the outer diameter edge may come off from the groove 6 in some cases.

Problems also arise when the tube 7 is removed by the release ring 9. That is, when the locking body 3 is embedded in the outer wall of the tube 7 at the above-mentioned misaligned position, the locking body 3 is deeper than the set position and is deformed and tilted to a greater extent than the set position, and is embedded in the outer wall of the pipe 7. In order to release the engagement of the locking body 3 with the release ring 9, it is necessary to push the release ring 9 further inward than the set position. If there is a limit to this, the problem arises that it cannot be removed. Furthermore, at the time of removal, it is necessary to further deform the locking body 3, which has been deformed more than the setting as described above, to release the biting, so that the above deformation exceeds the elastic limit of the locking body 3. , a situation may occur in which it becomes impossible to reuse.

Furthermore, even if the locking body 3 is wedged into the outer wall of the tube 7 at the position where it has returned from the above-mentioned misaligned position to its normal position in the groove 6 due to its elastic force, the tube 7 will not be pushed back in the removal direction when it returns. If the release ring 9 is pushed in during removal, the tube 7 will not be fixed at the specified insertion position, causing fluid leakage, and if the release ring 9 is pushed in during removal, the tube 7 will remain stuck in the locking body 3 when it is first inserted. Since the release ring 9 tries to push the inner diameter edge of the locking body 3 apart after it has been pushed in a little to the position, the situation is exactly the same as in the previous case, and the same porridge as described above occurs.

In this way, when the tube 7 is inserted into the locking body 3, it opens uniformly outward, and when the tube 7 is pulled out, it smoothly rises and moves largely in the axial direction. It is desirable for the locking body 3 to be fully embedded and to open wide outwards when the locking body 3 is released from the biting, and although improvements have been made for this purpose, the more improvements in this point are made, the more difficult it is for the locking body 3 to open outward. Rigidity is lost, the tip of the locking body rises in the axial direction, and it is made of an elastic member, so even if the tube is inserted with a slight deviation from the axial direction, the locking body will not stay in place. The pipe collided violently only in the section, damaging the locking body.
This creates a contradiction in that the object is deformed or moved out of its normal position. Moreover, since a clearance is required between the tube and the release ring 9, it is difficult to avoid inserting the tube from an oblique direction, and the method of storing the tube itself is to wind the tube into a coil, and when using it, it is difficult to avoid inserting the tube from an oblique direction. Since the pipe is cut and used immediately, the pipe itself has strong curls and tends to be inserted diagonally into the pipe joint, so the pipe that is pushed in will only hit the locking claw of a part of the locking body. There is a great danger that if the lock claw is pressed against the lock claw itself, it will warp beyond its elastic limit and will not be able to return to its original shape.

The present invention relates to improvements in the above points, and its purpose is to ensure smooth and reliable insertion and locking of pipes and to prevent breakage and deformation of the locking body in the pipe joint. The purpose of the present invention is to provide a pipe joint that is fitted into the joint body and prevents the pipe inserted into the joint body from moving in the withdrawal direction by having its locking end embedded in the outer wall surface of the pipe. a locking body; and a locking body supported movably within a predetermined range at least in the axial direction of the joint body in order to press the locking end of the locking body at a moving position to control biting of the locking end into the pipe. In a pipe fitting equipped with a release ring,
A stopper is provided near the outer periphery of the locking end to prevent excessive release of the tip of the locking end.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 4, 10 is a nearly cylindrical joint body;
Inside this, there is a first step 11 and a second step 1 from the tube insertion end side.
A second and a third step 13 are formed, and the inner diameter thereof is sequentially reduced by each step. Reference numeral 14 denotes a substantially cylindrical guide ring fixed within the joint body 10 so that its collar 15 joins to the first step 11, and a regulating step 16 is provided on the inner wall in the axial direction of the guide ring. An annular groove 17 is provided around one end, and the entire body is made of brass.

The inner diameter of the joint body 10 is determined by the second step 12 so that the inner diameter of the nylon or polyurethane tube 1 to be inserted is
8, and the third step 13 positions the insertion tip of the tube 18 to be inserted.

Reference numeral 19 denotes an elastic sleeve, which is made of an elastic member such as rubber and molded into a substantially cylindrical shape.An annular escape groove 20 is formed in the left edge of the elastic sleeve 19. Reference numeral 21 denotes a sealing portion consisting of protrusions arranged in parallel on the outer circumferential surface of the elastic sleeve 19.

22 is a locking body, which is thin (
A flat elastic body such as phosphor bronze is punched into an annular shape, and a large number of radial notches 23 and 24 are alternately formed from each of the inner and outer edges. There is.

The locking body 22 has its outer diameter edge loosely fitted into the annular groove 17, and its inner diameter edge sinks into the outer wall of the tube 18 into which it is inserted to prevent the tube 18 from being pulled out.
The outer peripheral edge of the locking body 22 on the side where the notch 24 is formed is bent over a predetermined width in the direction of insertion of the tube 18 to form a dogleg shape in cross section, and the outer peripheral edge thereof is annular i17. It comes into contact with the corresponding corner portion or the wall surface of the annular groove 17 on the corresponding corner portion side. Reference numeral 17a denotes a stopper of the locking body 22, which constitutes a main part of the present invention, and has a tapered ring shape formed by narrowing the tip of the guide ring 14, and the annular groove 17 is formed at the root portion thereof. be done.

Reference numeral 25 denotes a substantially cylindrical release ring (FIG. 4), whose enlarged diameter step 26 abuts against the regulation step 16 of the guide ring 14, and its collar 27 abuts against the tube insertion end of the guide ring 14. The guide ring 14 is fitted and supported in order to restrict the range of movement in the axial direction. The outer circumferential surface of the release ring 25 is tapered so that the diameter decreases from the diameter-enlarging step 26 toward the tip, and the inner diameter edge of the locking body 22 is pushed toward the elastic sleeve 19 at the tip. are doing. As a result, the inner diameter end edge of the locking body 22 is deformed into a conical shape, and the inner diameter end edge is positioned so as to slightly protrude inward from the outer wall surface of the tube 18 into which it is inserted.

In the above configuration, when the tube 18 is inserted into the joint body 10 from the direction of the release ring 25, the tube 18 is inserted into the locking body 2.
The inner diameter edge of the tube 18 is pushed apart from the outer wall surface of the tube while resisting the elastic force of the inner diameter edge, and the tip of the tube 18 is moved to the third step 13.
is inserted until it touches the specified position.

When the pipe 18 is inserted into the pipe joint with the above configuration from an oblique direction with respect to the axial direction of the pipe joint, the distal end of the pipe 18 comes into contact with the locking body 22, and then the locking body 22 is warped, and then The outer circumferential side near the tip of the locking body 22 abuts against the stopper 172 and is supported by the stopper in a so-called pile shape, and the tube 18 inserted along the tapered surface of the stopper 17a is supported by the high rigidity of the stopper 172 and advances. Since the direction can be changed, the tube 18 is guided toward the center, which is the axial direction of the tube joint, without having to reinsert the tube 18, and the tube insertion is completed smoothly. This prevents the tip of the locking body from excessively warping beyond its elastic limit, and completely prevents the locking body from being damaged, deformed, or pulled out.

FIG. 8 shows an embodiment of the stopper 17a in which the stopper 178 is molded separately from the guide ring 14, and a tapered cone 32 supported by a cylindrical support ring 30 and formed of a highly rigid metal functions as the stopper. do.

In this way, the stopper 178 and the guide ring 14 can be configured separately, but by configuring them as one body, the following effects can be achieved. That is, by cutting the tip of the guide ring 14 from the inside to make it thinner, dropping the locking body 22 into the step formed by this, and narrowing the thin part of the tip of the guide ring into a tapered cone shape, the locking body is formed. Concave groove 17 that holds 22
Not only can the stopper 178 and the stopper 178 be molded at the same time, but also the stopper 172 prevents the locking body 22 from popping out from the guide ring 14, which simplifies the assembly work when assembling the pipe joint. When forming a taper cone by narrowing down the tip of the guide ring 14, it is difficult to narrow down the entire tip uniformly, so it will have a slightly wavy shape compared to a complete taper cone, but this degree of deformation will act as a stopper and There is no problem at all (even if it has an inner flange shape, it can withstand use).

In this way, according to the present invention, there is no risk of damage, deformation, or pulling out of the locking claw of the locking body by simply installing the stopper, and since the stopper guides the pipe, it can be used even if the pipe has a strong habit. becomes possible,
Since the pipe is inserted smoothly and reliably, it is always locked under certain conditions, and a reliable pipe connection can be made even to a pipe joint installed in a position where insertion is difficult. Furthermore, when the guide ring and the stopper are integrated, the pipe joint can be easily assembled.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

Figure 1 is a front view showing a conventional locking body, Figure 2 is a sectional view showing the structure of a conventional pipe joint incorporating this locking body, and Figure 3 is a cross-sectional view showing the structure of a conventional pipe joint incorporating this locking body.
The figure is an explanatory diagram of the operation of this pipe joint. 4 is a sectional view of the pipe joint according to the present invention, FIG. 5 is a front view and a sectional view of the locking body, FIG. FIG. 8 is a perspective view of a stopper formed by molding the stopper separately from the guide ring. 1.2...notch, 3...locking body.4. ...Joint body, 5...Guide ring. 6...Concave groove, 7...Pipe, 8...Elastic sleeve,
9...Release ring, 10...Joint body, 11...
1st step, 12... 2nd step, 13... 3rd step, 14... guide ring, 15... flange, 16...
... Regulation step, 17 ... Annular groove, 17a ... Stopper, 18 ... Pipe, 19 ... Elastic body sleeve, 2
0... Relief groove, 21... Seal portion, 22... Locking body, 23.24... Notch, 25... Release ring, 26... Diameter expansion step, 27... Flange Part, 30...
Support ff (, 32... Taper cone. Patent applicant Tomio Hama, representative of Nippon Visco Co., Ltd. Drawing 1 Drawing 2 Drawing 3

Claims (1)

[Claims] 1. The locking end of the tube is inserted into the joint body, and the locking end touches the outer wall surface of the tube (
a locking body that prevents the locking body from biting into the pipe; and a locking body that presses the locking end of the locking body at a moving position to control the locking end from biting into the pipe within a predetermined range at least in the axial direction of the joint body. 1. A pipe joint comprising a release ring movably supported by a pipe joint, characterized in that a stopper is provided near the outer periphery of the locking end to prevent excessive release of the tip of the locking end. 2. The pipe joint according to claim 1, wherein the stopper has a tapered ring shape. 3. The pipe joint according to claim 1, wherein the stopper is a stopper formed by tapering the tip of a guide ring that holds the locking body into a tapered ring shape.