JP2606072Y2 - Retaining ring for bayonet joint - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining ring used for a bayonet joint which is used for a resin pipe such as a polyethylene pipe.

[0002]

2. Description of the Related Art Conventionally, as a retaining ring of this kind, FIG.
5 and FIG. 16 were known. This retaining ring 1 is made of a hard synthetic resin, and its shape is
An outer constricted tapered surface 11 having an inclination angle θ is provided on the outer peripheral side and a serrated projection group 12 is provided on the inner peripheral side, and the outer peripheral surface 13 and the inner peripheral surface 14 provided with the projection group 12 are concentric. In the shape of a circle, and has a missing circle portion 15 having a reduced diameter portion W at one location in the circumferential direction.

As shown in FIG. 14, the retaining ring is interposed between a receiving port 110 of a bayonet joint 100 and a pipe P inserted into the receiving port 110. When the pipe P moves in the direction of the arrow X with the retaining ring 1, the tapered surface 11 of the retaining ring 1 is pushed radially inward by the constricted tapered surface 120 provided in the insertion joint 100. As a result, the projection group 12 exerts a function of engaging the outer peripheral surface P1 of the pipe P in the axial direction to prevent the pipe P from coming off.

When the pipe P is not inserted into the insertion joint 100, the retaining ring 1 is housed and held in the receiving port 110, and the inner diameter D of the retaining ring 1 at that time.
(See FIG. 15) is smaller than the outer diameter DP of the pipe P. Therefore, the retaining ring 1 is expanded in diameter by being pushed into the tapered chamfered portion P2 at the tip of the tube P inserted into the receiving port 110, and is fitted into the tube P as shown in FIG. The projection group 12 is formed by the reaction force accompanying the diameter expansion of the retaining ring 1.
The initial locking force between the pipe and the outer peripheral surface P1 of the pipe P is determined.

The above-mentioned initial locking force is the locking force when the tapered surface 11 of the retaining ring 1 is not pushed inward by the tapered surface 120 on the side of the receiving port 110 in FIG. If the initial locking force is too small, the pipe P inserted into the receiving port 110 may be moved by the arrow X in FIG.
Even if it moves in the direction, the retaining ring 1 slides on the pipe P and does not perform the retaining function. Conversely, if the initial locking force is too large, the chamfered portion P of the pipe P inserted into the receiving port 110
Since the force required to expand the retaining ring 1 at 2 increases, it becomes difficult to insert the pipe P.

On the other hand, the tensile elastic modulus of the hard synthetic resin which is a constituent material of the retaining ring 1 is 100 to 300 kgf / mm.
² and that of metal is 10,000-25,000kgf
/ Mm ² , so a hard synthetic resin retaining ring 1
Is less rigid than a metal retaining ring, and the initial locking force is correspondingly smaller.

Accordingly, a retaining ring 1 made of a hard synthetic resin is used.
In order to obtain a sufficient initial locking force, the inner diameter D shown in FIG. 15 is made extremely smaller than the outer diameter DP of the pipe P (see FIG. 14), and the thickness H shown in FIG. The required rigidity is ensured by increasing the thickness or the width L, and the initial locking force is increased.

[0008]

However, if the inner diameter D of the retaining ring 1 is reduced, the pipe P is less likely to fit into the retaining ring 1 unless the chamfer dimension of the chamfered portion P2 of the pipe P is increased accordingly. When the retaining ring 1 is fitted in the pipe P and expanded in diameter, the retaining ring 1 which was originally a perfect circle is distorted as shown in FIG. There is a problem that the projection group 12 only partially hits the outer peripheral surface of the pipe P, and the reliability of the retaining function is easily impaired. Further, when the thickness H of the retaining ring 1 is increased, the diameter of the receiving port 110 must be increased, and when the width L of the retaining ring 1 is increased, the length of the receiving port 110 must be increased. was there.

The present invention has been made in view of the above-mentioned problems, and has been devised so that its rigidity can be enhanced by a metal ring, thereby increasing the diameter or length of the socket of the bayonet joint. An object of the present invention is to provide a retaining ring capable of exhibiting a reliable retaining function without causing any slippage. Another object of the present invention is to provide a retaining ring that maintains a perfect circular shape even when fitted into a tube so that the projections uniformly contact the entire outer peripheral surface of the tube.

[0010]

According to the first aspect of the present invention, a retaining ring for a bayonet joint has a tapered surface on an outer peripheral side corresponding to a constricted tapered surface provided on the bayonet joint and the inner peripheral side has a tapered surface. A hard synthetic resin oval retaining ring main body having a projection group that can be axially engaged with the outer peripheral surface of the pipe inserted into the insertion joint, and the entire circumference of the retaining ring main body. said retaining have been embedded in the synthetic resin layer
And a metal ring with greater rigidity than the ring main body .

According to a second aspect of the present invention, there is provided a retaining ring for a bayonet joint according to the first aspect of the present invention, wherein the hard synthetic resin oval retaining ring body has an outer peripheral surface and an inner peripheral surface having a group of projections. Concentrically, the metal ring is
The force required for the diameter expansion is maximum at a location on the opposite side of the missing circle, and becomes smaller as the location approaches the missing circle from that location.

According to a third aspect of the present invention, there is provided a retaining ring for a bayonet joint having a tapered surface on the outer peripheral side corresponding to the constricted tapered surface provided on the bayonet joint, and inserted into the inner peripheral side of the bayonet joint. A hard synthetic resin oval retaining ring body made of a group of projections that can be engaged in the axial direction on the outer peripheral surface of the pipe, and embedded in the synthetic resin layer over the entire circumference of the retaining ring main body. From the retaining ring body
The rigid circular metal has a partially circular ring, and the partially circular ring has a predetermined length including the end faces of both ends embedded in the synthetic resin layer of the retaining ring main body, and At least a part of the intermediate portion excluding both end portions is exposed on the outer peripheral surface side of the retaining ring main body.

According to a fourth aspect of the present invention, there is provided a retaining ring for a bayonet joint according to the third aspect of the present invention, wherein a hard synthetic resin cutout retaining ring main body has an outer peripheral surface and an inner peripheral surface having a group of projections. Concentrically, the metal ring is
The force required for the diameter expansion is maximum at a location on the opposite side of the missing circle, and becomes smaller as the location approaches the missing circle from that location.

[0014]

According to the construction of the first aspect, the rigidity of the retaining ring body made of hard synthetic resin and the rigidity of the metal ring become the rigidity of the retaining ring, and the conventional retaining structure made of only the hard synthetic resin layer. It has greater rigidity than a ring.

According to the second aspect of the invention, even when the retaining ring, which was originally in a perfect circular shape, is fitted into the tube and expanded in diameter, the perfect circular shape is maintained and the projections are formed on the outer periphery of the tube. Hit the surface uniformly.

According to a third aspect of the present invention, a hard synthetic resin is used.
The rigidity of the retaining ring body and the rigidity of the metal ring
It becomes the rigidity of the retaining ring, consisting only of a hard synthetic resin layer
It has greater rigidity than conventional retaining rings. Ma
In addition, when the retaining ring is insert-molded, a portion of the missing circular ring exposed on the outer peripheral surface side of the retaining ring main body is held by a holder, and the missing circular ring is placed in a molding space of a mold. It is possible to insert a synthetic resin into the molding space and insert-mold it in that state, so that insert molding can be easily performed. In addition, since the predetermined length portion including the end faces of both ends of the missing circular ring is configured to be embedded in the synthetic resin layer of the retaining ring main body, this is the case of the missing circular ring and the retaining ring. This is useful for increasing the strength of integration with the main body, and makes it less likely that the end of the missing circular ring will come off the synthetic resin retaining ring main body.

According to the structure of the fourth aspect, even when the retaining ring, which was originally a perfect circular shape, is fitted into the tube and expanded in diameter, the perfect circular shape is maintained, and the projections are formed on the outer periphery of the tube. Hit the surface uniformly.

[0018]

1 shows a retaining ring 1 according to the present invention.
2 is a partially cutaway front view of the retaining ring 1, and FIG. 3 is a sectional view of the retaining ring 1 of FIG.

The retaining ring 1 comprises a cutout retaining ring main body 16 made of a hard synthetic resin such as a hard polyacetal resin and a cutout ring 17 made of a metal. The shape of the retaining ring 1 is substantially the same as that described in the conventional example, but the constricted tapered surface 11 and the serrated projection group 12 having the inclination angle θ described in the conventional example are hard synthetic resin. It is provided on the side of the retaining ring main body 16 made of. Further, as for the serrated projection group 12, as shown in detail in FIG. 3, parallel portions 12a are provided between the serrated teeth. The parallel portion 12a corresponds to the inner peripheral surface 14 of the retaining ring 1. In the illustrated example, the serrated protrusion group 12 is a set of a plurality of ring-shaped serrated teeth at the same pitch.

The metal ring 17 is a retaining ring main body 1.
6 is embedded in the synthetic resin layer by insert molding over the entire outer periphery on the larger diameter side, and the missing circular portion 17a of the ring 17 and the missing circular portion 16a of the retaining ring main body 16 are one-piece. The missing circles 17 a and 16 a coincide with the missing circle 15 of the retaining ring 1. The ring 17
Is made of a metal having a circular cross section and a uniform thickness over the entire length.

As shown in FIG. 1, the retaining ring 1 is interposed between the receiving port 110 of the plug-in joint 100 and the pipe P inserted into the receiving port 110, and the pipe P accompanies the retaining ring 1. When it moves in the direction of arrow X, the tapered surface 11 of the retaining ring 1
When the protrusions 12 are pushed inward by the diameter 0 to reduce the diameter, the projection group 12 exerts a function of engaging the outer peripheral surface P1 of the pipe P in the axial direction to prevent the pipe P from coming off.

When the pipe P is not inserted into the insertion joint 100, the retaining ring 1 is housed and held in the receiving port 110, and the inner diameter D of the retaining ring 1 at that time.
(See FIG. 2) is smaller than the outer diameter DP of the pipe P. Therefore, the retaining ring 1 is expanded in diameter by being pushed into the tapered chamfered portion P2 at the tip of the tube P inserted into the receiving port 110, and is fitted into the tube P as shown in FIG. The initial locking force between the projection group 12 and the outer peripheral surface P1 of the pipe P is determined by the reaction force accompanying the diameter expansion of the retaining ring 1.
S is a stiffener.

Here, the reaction force accompanying the diameter expansion of the retaining ring 1 is determined by the reaction force accompanying the diameter expansion of both the retaining ring main body 16 made of hard synthetic resin and the metal ring 17. Rigidity is much higher than hard synthetic resin. Therefore, the reaction force accompanying the diameter expansion of the retaining ring 1 according to the embodiment of FIGS. 1 to 3 is larger than that of the conventional retaining ring 1 (see FIGS. 15 and 16) which is entirely made of a hard synthetic resin. As a result, the initial locking force on the pipe P increases accordingly. From this, the thickness H of the retaining ring 1
Even if the width L is not increased (even if the width L is reduced), a sufficiently large initial locking force can be obtained. Therefore, a reliable retaining function can be exhibited without increasing the diameter or length of the receiving port 110 of the bayonet joint 100. Further, for the same reason, a large initial locking force can be obtained without reducing the inner diameter D, so that it is not necessary to increase the chamfer dimension of the chamfered portion P1 of the pipe P more than necessary.

The retaining ring 1 shown in FIG. 4 uses an L-shaped ring as the metal ring 17. According to this, the inner flange portion 17b of the ring 17 increases the rigidity of the retaining ring 1 as a whole. It works especially effectively. The retaining ring 1 shown in FIG. 5 uses a ring having internal teeth 17c and edges 17d as the metal ring 17,
In this case, the ring 17 is the retaining ring body 16.
Are embedded over the entire circumference in the inner diameter portion on the larger diameter side, and the internal teeth 17 c constitute a part of the projection group 12. According to this, since the internal teeth 17c are made of metal, the internal teeth 17c can easily bite into the outer peripheral surface of the pipe, and the retaining function is improved accordingly.

FIG. 6 shows a pipe P ′ on which a stiffener S is mounted instead of the pipe P in FIG.
Shows the state of being inserted. Since the structure and function of the retaining ring 1 are the same as those described in FIG. 1, the same reference numerals are used in FIG. 6 as in FIG. 1 and the detailed description is omitted. In FIGS. 1 and 6, 2
Is a packing, and 3 is a retainer.

FIG. 7 shows a retaining ring 1 according to an embodiment of the present invention. In the retaining ring 1, the outer peripheral surface 13 and the inner peripheral surface including the projection group 12 are concentric. In addition, the missing circular ring 17 made of metal has a missing circular portion 17a.
The cross-sectional area at a location a on the opposite side of FIG. 7 is the largest, and the cross-sectional area gradually decreases as the location approaches the missing circle portion 17a from the location a. In such a metal ring 17, the force required for expanding the diameter thereof is maximum at a location a on the opposite side of the missing circle 17 a, and becomes smaller as the location approaches the missing circle 17 a from that location. For this reason, in the retaining ring 1, a beam of uniform strength extending in the circumferential direction toward the missing circle portion 15 with the location A as a fulcrum is obtained. Even if such a retaining ring 1 is fitted in a pipe and expanded in diameter, a perfect circular shape is maintained.
The projections 12 uniformly contact the outer peripheral surface of the tube, which helps to increase the reliability of the retaining function. As shown in FIG. 8, a uniform strength beam can also be obtained by decentering the outer peripheral surface 13 and the inner peripheral surface 14 in a noncircular retaining ring made entirely of a hard synthetic resin as shown in FIG. The inner peripheral surface 1 is accommodated and held in the receptacle of the bayonet joint.
4 is greatly eccentric with respect to the receiving port, which hinders the insertion of the pipe, and cannot be put to practical use.

The retaining ring 1 in each of the embodiments described above is positioned at a predetermined position in the molding space of the mold by holding the metal ring 17 on a holder, and in that state, the synthetic resin is filled in the molding space. Although it is possible to manufacture using the insert molding method of injecting, when such an insert molding method is applied, in the ring 17, the portion held by the holder is the outer peripheral surface of the retaining ring main body 16. Side or the inner peripheral side. For this reason, for example, in a bayonet joint 100 using the retaining ring 1 as described with reference to FIGS.
When the pipe P moves in the direction of the arrow X with the retaining ring 1 from the state shown in FIG. 2, a pulling force is applied to the retaining ring body 16 in the direction of the arrow X, while the ring 17 has a constricted tapered surface 12.
Since a force for preventing the movement in the arrow X direction is applied by 0, the ring 17 may be detached from the retaining ring main body 16 and detached. The detached portion 17a and the missing portion 1 of the retaining ring body 16 like the ring 17 of the retaining ring 1 described with reference to FIG.
6a is likely to occur in the case of a simple oval shape that coincides with 6a, and in such a retaining ring 1, peeling near the end including the oval portion 17a of the ring 17 first occurs. It has been found that this occurs, which triggers the middle or entirety of the ring 17 to come off the retaining ring body 16.

The retaining ring 1 according to the third aspect of the present invention has been made in view of such a situation, and FIG. 9 is a sectional view showing an embodiment thereof. In this case, the ring 17 has a predetermined length including the end faces of both ends 17d, 17d curled radially inward, and the curled both ends 17d, 17d are formed of the synthetic resin layer of the retaining ring main body 16. It is completely embedded inside. Also, both ends 17
Although the intermediate portion except for d and 17d is embedded in the retaining ring main body 16, a part of the outer surface is exposed on the outer peripheral surface side of the retaining ring main body 16. Figure 1 for other items
To FIG. 3.

According to the retaining ring 1, the ring 17
Are embedded in the synthetic resin layer of the retaining ring main body 16 so that both ends 1d of the retaining ring 17d are not embedded.
Separation at 7d and 17d is unlikely to occur, and as a result, the situation where the ring 17 peels off from the retaining ring main body 16 and separates is less likely to occur. Moreover, this retaining ring 1
When the insert molding, the retaining ring body 16
The part exposed on the outer peripheral side of the holder is held by the holder and positioned at a predetermined position in the molding space, and in that state, synthetic resin can be injected into the molding space and insert molding can be performed, so insert molding is easy It is possible to do.

FIGS. 10 to 12 show modified examples of the retaining ring 1 according to claim 3, which differ only in the cross-sectional shape of the ring 17. FIG. That is, in FIG. 10, the ring 17 having a T-shaped cross section is embedded in the retaining ring main body 16, and in FIG. 11, the ring 17 having a rectangular cross section is embedded in the retaining ring main body 16. In FIG. 12, the ring 17 having an L-shaped cross section is embedded in the retaining ring main body 16, and both ends of the rings 17 are curled inward to remove the ring. The retaining ring 16 is embedded in the synthetic resin layer.

FIG. 13 shows another embodiment of the present invention. In the retaining ring 1, a metal ring bent in a wavy shape is used as the ring 17, and both end portions 17 d, 17 d including the end surface of the ring 17 are used.
A predetermined length is embedded in the synthetic resin layer of the retaining ring main body 16, and a portion 17 e of the ring 17 forming a mountain-shaped top is exposed on the outer peripheral surface side of the retaining ring main body 16. At the time of manufacture, such a retaining ring 1 is formed at a point 1 forming the mountain-shaped top of the ring 17.
7e is positioned at a predetermined position in the molding space while being held by the holder.

Each retaining ring 1 described with reference to FIGS.
In this case, the retaining ring main body 16 is provided with an outer peripheral surface 13 and an inner peripheral surface 14 having the projection group 12 concentrically, and the metal ring 17 has a force required for expanding the diameter thereof opposite to that of the missing circle. It is also possible to adopt a configuration that is maximum at the side location and becomes smaller as the location approaches the missing circle portion from that location, in which case, although not shown,
It is effective that the cross-sectional area of the ring 17 at the opposite side to the missing circle is the largest, and the cross-sectional area gradually decreases as the position approaches the missing circle from that location. Such a structure corresponds to a retaining ring according to the invention of claim 4.

[0033]

According to the first aspect of the present invention, it is possible to increase the rigidity of the retaining ring without increasing the inner diameter, thickness and length of the retaining ring. It is possible to provide a retaining ring that can exhibit a reliable retaining function without increasing the length of the retaining ring. In addition to such an effect, according to the invention of claim 2, the projections uniformly contact the entire outer peripheral surface of the pipe, and the reliability of the retaining function can be improved.

According to the invention of claim 3 , according to the invention of claim 1
In addition to the above-mentioned effects, it is easy to manufacture by applying the insert molding method, and the end of the missing circular ring is made of synthetic resin on the outer peripheral surface side of the retaining ring body in the missing circular ring. It is possible to provide a retaining ring that is difficult to detach from the ring main body. In addition to the above effects, according to the invention of claim 4, the projections uniformly contact the entire outer peripheral surface of the pipe, and the reliability of the retaining function can be improved.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a use state of a retaining ring according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the retaining ring.

FIG. 3 is a sectional view of the retaining ring of FIG. 2;

FIG. 4 is a sectional view of a retaining ring according to a modification.

FIG. 5 is a sectional view of a retaining ring according to another modification.

FIG. 6 is a sectional view showing a stiffener tube according to the present invention;
FIG. 4 is a partial cross-sectional view illustrating a use state of a retaining ring according to an embodiment of the present invention.

FIG. 7 is a partially cutaway front view of a retaining ring according to an embodiment of the present invention.

FIG. 8 is a partially cutaway front view of a retaining ring according to a comparative example.

FIG. 9 is a sectional view of a retaining ring according to an embodiment of the present invention;

FIG. 10 is a sectional view of a retaining ring according to a modification corresponding to the retaining ring of FIG. 9;

FIG. 11 is a sectional view of a retaining ring according to another modification corresponding to the retaining ring of FIG. 9;

12 is a cross-sectional view of a retaining ring according to still another modification corresponding to the retaining ring of FIG. 9;

FIG. 13 is a sectional view of a retaining ring according to another embodiment of the present invention.

FIG. 14 is a partial cross-sectional view showing a usage state of a conventional retaining ring.

FIG. 15 is a front view of a conventional retaining ring.

FIG. 16 is a partial sectional view of a conventional retaining ring.

FIG. 17 is a front view of a conventional retaining ring fitted into a pipe.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 retaining ring 11 tapered surface 12 group of protrusions 13 outer peripheral surface 14 inner peripheral surface provided with group of protrusions 16 main body of non-circular retaining ring 17 non-circular ring 17 a non-circular portion of non-circular ring 17 d of non-circular ring End a) Opposite side of the missing circle portion 100 Plug-in joint 120 Tapered outer surface P tube P1 Outer surface of tube

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-177687 (JP, A) JP-A-51-24447 (JP, A) Jpn. Field (Int.Cl. ⁷ , DB name) F16L 21/08

Claims (4)

(57) [Scope of request for utility model registration] 1. A taper surface corresponding to an outer constriction taper surface provided in a bayonet joint is provided on an outer peripheral side, and is axially engageable with an outer peripheral surface of a pipe inserted into the bayonet joint on an inner peripheral side. A hard synthetic resin cutout retaining ring main body having a group of protrusions, and the retaining ring main body embedded in the synthetic resin layer over the entire circumference of the retaining ring main body;
A retaining ring for a bayonet joint, comprising: a metal-made broken ring having greater rigidity . 2. A ring-shaped retaining ring made of a hard synthetic resin has its outer peripheral surface and an inner peripheral surface provided with a group of projections concentrically, and a metal-made circular ring has an enlarged diameter. 2. The retaining ring for a bayonet joint according to claim 1, wherein the force required for the insertion joint is maximum at a location opposite to the missing circle, and becomes smaller as the location approaches the missing circle from that location. 3. A taper surface corresponding to an outer constriction taper surface provided in a bayonet joint is provided on an outer peripheral side, and is axially engageable with an outer peripheral surface of a pipe inserted into the bayonet joint on an inner peripheral side. A hard synthetic resin cutout retaining ring main body having a group of protrusions, and the retaining ring main body embedded in the synthetic resin layer over the entire circumference of the retaining ring main body;
A metal having a greater rigidity than the metal, and a predetermined length portion including the end surfaces of both ends is embedded in the synthetic resin layer of the retaining ring main body, and A retaining ring for a bayonet joint, wherein at least a part of an intermediate portion excluding both end portions thereof is exposed on an outer peripheral surface side of the retaining ring main body. 4. A hard synthetic resin non-circular retaining ring main body is provided with an outer peripheral surface and an inner peripheral surface having a group of projections concentrically. 4. The retaining ring for a bayonet joint according to claim 3, wherein the force required is largest at a location opposite to the missing circle, and becomes smaller as the location approaches the missing circle from that location.