JPH0662286U - Retaining ring for plug-in joint - Google Patents

Abstract

(57) [Summary] [Purpose] In a retaining ring mainly made of synthetic resin used for insertion joints, to increase the rigidity without increasing the thickness and width to exert a reliable retaining function. [Structure] A taper surface 11 is provided on the outer peripheral side, and a pipe P is provided on the inner peripheral side.
A ring-shaped retaining ring body 16 made of a hard synthetic resin, which includes a group of protrusions 12 capable of engaging with each other, and a metal defect embedded in the synthetic resin layer of the retaining ring body 16 along its entire circumference. It has a circular ring 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a retaining ring for use in a plug-in joint in which a resin pipe such as a polyethylene pipe is used.

[0002]

[Prior art]

 Conventionally, the retaining ring shown in FIGS. 15 and 16 has been known as this type of retaining ring. The retaining ring 1 is made of a hard synthetic resin, and its shape is such that a tapered surface 11 having an outer constriction having an inclination angle θ is provided on the outer peripheral side and a protrusion group 12 having a sawtooth shape on the inner peripheral side. The outer peripheral surface 13 and the inner peripheral surface 14 having the projection group 12 are concentrically provided, and the outer peripheral surface 13 and the inner peripheral surface 14 are provided in a circular shape having a circular portion 15 having a diameter reduction margin W at one position in the circumferential direction. .

As shown in FIG. 14, the retaining ring is interposed between the receiving port 110 of the insertion joint 100 and the pipe P inserted in the receiving port 110. When the pipe P moves in the arrow X direction together with the retaining ring 1, the tapered surface 11 of the retaining ring 1 is inserted radially inward by the outer tapered surface 120 of the insertion joint 100. The projection group 12 exerts a function of axially engaging the outer peripheral surface P1 of the pipe P 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 accommodated and held in the receiving port 110, and the inner diameter D (see FIG. 15) of the retaining ring 1 at that time is It is smaller than the outer diameter DP of P. Therefore, the retaining ring 1 expands in diameter by being pushed into the tapered chamfered portion P2 at the tip of the pipe P that has been inserted into the receiving port 110, and is fitted into the pipe 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 associated with the expansion of the retaining ring 1.

By the way, the initial locking force is the locking force when the tapered surface 11 of the retaining ring 1 in FIG. 14 is not pushed radially inward by the narrowed tapered surface 120 on the receiving port 110 side. If the initial locking force is too small, the retaining ring 1 slips with respect to the pipe P even if the pipe P inserted in the receptacle 110 moves in the direction of the arrow X in FIG. The retaining function will not be exhibited. On the contrary, if the initial locking force is too large, the force required to expand the diameter of the retaining ring 1 at the chamfered portion P2 of the pipe P inserted into the receiving port 110 becomes large, so that it becomes difficult to insert the pipe P.

[0006] On the other hand, a rigid synthetic tensile modulus 100 to 300 kgf / mm ² of the resin which is the material of the stop ring 1, so it metals is 10000~25000kgf / m m ^2, made of hard synthetic resin The retaining ring 1 is less rigid than the retaining ring made of metal, and the initial locking force is smaller accordingly.

Therefore, for the retaining ring 1 made of a hard synthetic resin, in order to obtain a sufficient initial locking force, the inner diameter D shown in FIG. 15 is compared with the outer diameter DP of the pipe P (see FIG. 14). 16 has been made extremely small, or the thickness H shown in FIG. 16 is made thicker or the width L is made longer to secure the necessary rigidity and increase the initial locking force.

[0008]

[Problems to be solved by the device]

 However, if the inner diameter D of the retaining ring 1 is reduced, the pipe P is less likely to fit in the retaining ring 1 unless the chamfered dimension of the chamfered portion P2 of the pipe P is increased accordingly. When the ring 1 fits into the pipe P and expands in diameter, the retaining ring 1 that was initially a circular shape is distorted as shown in FIG. 17 and the circular shape is no longer maintained. In addition, there is a problem in that the projection group 12 is only partially hit and the reliability of the function is easily impaired because the projection group 12 is prevented from coming off. Further, if the thickness H of the retaining ring 1 is increased, the diameter of the receiving port 110 must be increased, and if the width L of the retaining ring 1 is increased, the length of the receiving port 110 must be increased. There was a problem.

The present invention has been made in view of the above problems. By devising such that the rigidity can be increased by a metal ring, the diameter and length of the socket of the insertion joint can be increased. It is an object of the present invention to provide a retaining ring that can exert a reliable retaining function without being lengthened. It is another object of the present invention to provide a retaining ring that retains a perfect circle shape even when it is fitted into a pipe so that the projections uniformly contact the entire outer peripheral surface of the pipe.

[0010]

[Means for Solving the Problems]

 A retaining ring of a plug joint according to the invention of claim 1 is provided with a tapered surface corresponding to an outer tapered surface provided on the plug joint on an outer peripheral side and an inner peripheral side of a pipe inserted into the plug joint. A hard synthetic resin retaining ring body that has a group of protrusions that can be engaged in the outer peripheral surface in the axial direction, and is embedded in the synthetic resin layer over the entire circumference of the retaining ring body. And a circular ring made of metal.

According to a second aspect of the present invention, there is provided a retaining ring for a plug-in joint according to the first aspect, wherein the main body is a synthetic synthetic resin, and the main body of the circular retaining ring has an outer peripheral surface and an inner peripheral surface having a group of protrusions. With a concentric metal ring, the metal-made circular ring-shaped ring has the maximum force required to expand its diameter at the point on the opposite side of the circular-arc portion, and becomes smaller from that point toward the circular-arc portion. is there.

A retaining ring for a plug-in joint according to a third aspect of the present invention is provided with a tapered surface corresponding to a constricted tapered surface provided on the plug-in joint on the outer peripheral side and inserted on the inner peripheral side into the plug-in joint. A rigid synthetic resin retaining ring body made of a group of protrusions that can be engaged in the outer peripheral surface of the pipe in the axial direction, and a synthetic resin layer covering the entire circumference of the retaining ring body. The ring-shaped ring made of metal is embedded, and the ring-shaped ring has a predetermined length portion including the end faces of both ends embedded in the synthetic resin layer of the retaining ring body, and At least a part of the intermediate portion excluding both ends thereof is exposed on the outer peripheral surface side of the retaining ring body.

According to a fourth aspect of the present invention, there is provided a retaining ring for a plug-in joint according to the third aspect, wherein the main body is a synthetic synthetic resin, and the main body of the circular retaining ring has an outer peripheral surface and an inner peripheral surface having a group of protrusions. With a concentric metal ring, the metal-made circular ring-shaped ring has the maximum force required to expand its diameter at the point on the opposite side of the circular-arc portion, and becomes smaller from that point toward the circular-arc portion. is there.

[0014]

[Action]

 According to the structure of claim 1, the rigidity of the retaining ring main body made of the hard synthetic resin and the rigidity of the metal ring become the rigidity of the retaining ring, which is more than the conventional retaining ring having only the hard synthetic resin layer. Great rigidity is provided.

According to the structure of claim 2, even when the retaining ring, which is initially in the shape of a perfect circle, is fitted into the tube and the diameter is expanded, the shape of the perfect circle is maintained and the projection group has the outer periphery of the tube. Hit the surface evenly.

According to the structure of claim 3, in the case where the retaining ring is insert-molded, the holder is made to hold a portion exposed on the outer peripheral surface side of the retaining ring main body in the truncated ring-shaped ring. Since the ring-shaped ring can be held at a predetermined position in the molding space of the mold, and synthetic resin can be injected into the molding space in that state to perform insert molding, insert molding can be performed easily. In addition, since the ring-shaped ring has a predetermined length portion including the end faces of both ends thereof embedded in the synthetic resin layer of the retaining ring body, this is due to this fact. This helps increase the strength of integration with the main body, and it is unlikely that the end of the ring-shaped ring will come off from the synthetic resin retaining ring body.

According to the structure of claim 4, even when the retaining ring, which was initially in the shape of a perfect circle, is fitted into the tube and the diameter is expanded, the shape of the perfect circle is maintained and the projection group has the outer circumference of the tube. Hit the surface evenly.

[0018]

Embodiment FIG. 1 is a partial sectional view showing a usage state of a retaining ring 1 according to the invention of FIG. 1, FIG. 2 is a partially cutaway front view of the retaining ring 1, and FIG. 3 is a retaining ring of FIG. It is a sectional view of FIG.

The retaining ring 1 is composed of an elliptic retaining ring body 16 made of a hard synthetic resin such as a hard polyacetal resin and a metallic elliptic ring 17. The shape of the retaining ring 1 is substantially the same as that described in the conventional example, but the tapered surface 11 having a constriction and the serrated projection group 12 having the inclination angle θ described in the conventional example are hard. It is provided on the side of the retaining ring body 16 made of synthetic resin. As shown in detail in FIG. 3, the saw tooth-shaped projection group 12 is provided with parallel portions 12a between the saw teeth. The parallel portion 12a corresponds to the inner peripheral surface 14 of the retaining ring 1. In the illustrated example, the sawtooth-shaped projection group 12 is a set of a plurality of ring-shaped sawtooths arranged at every pitch.

The metal ring 17 is embedded in the synthetic resin layer by insert molding over the entire circumference of the large-diameter outer peripheral portion of the retaining ring main body 16, and the ring 17 has a cutout portion 17 a. The cutout ring main body 16 is coincident with the cutout circular portion 16a, and these cutout circular portions 17a, 16a are coincident with the cutout circular portion 15 of the cutout prevention ring 1. The ring 17 is made of 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 insertion joint 100 and the pipe P inserted into the receiving port 110, and the pipe P is accompanied by the retaining ring 1. When it moves in the direction of arrow X, the tapered surface 11 of the retaining ring 1 is radially inwardly pressed by the outer tapered surface 120 of the insertion joint 100 to be reduced in diameter, and the projection group 12 becomes the outer periphery of the pipe P 1. The function of axially engaging the surface P1 to prevent the pipe P from coming off is exhibited.

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 (see FIG. 2) of the retaining ring 1 at that time is It is smaller than the outer diameter DP of P. Therefore, the retaining ring 1 expands in diameter by being pushed in by the tapered chamfered portion P2 at the tip of the pipe P that has been inserted into the receiving port 110, and fits into the pipe P as shown in FIG. The retaining force between the projection group 12 and the outer peripheral surface P1 of the pipe P is determined by the reaction force associated with the expansion of the ring 1. S is a stiffener.

Here, the reaction force associated with the expansion of the retaining ring 1 is determined by the reaction forces associated with the expansion of both the retaining ring body 16 made of hard synthetic resin and the metal ring 17, and the metal Has significantly higher rigidity than hard synthetic resin. Therefore, the reaction force associated with the 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) made entirely of hard synthetic resin. As a result, the initial locking force for the pipe P also increases. As a result, a sufficiently large initial locking force can be obtained without increasing the thickness H or the width L of the retaining ring 1 (even if it is thin and small). Therefore, the reliable retaining function can be exerted without increasing the diameter or length of the receptacle 110 of the insertion 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 chamfered dimension of the chamfered portion P1 of the pipe P more than necessary.

The retaining ring 1 shown in FIG. 4 uses a ring having an L-shaped cross section as the metal ring 17. According to this, the inner collar portion 17b of the ring 17 enhances the rigidity of the retaining ring 1 as a whole. Acts particularly effectively on. The retaining ring 1 of FIG. 5 uses a ring having internal teeth 17c and edges 17d as the metal ring 17, and in this case, the ring 17 is provided on the large diameter side of the retaining ring body 16. It is embedded in the inner peripheral portion along the entire circumference, and the inner teeth 17c form a part of the projection group 12. According to this structure, since the inner teeth 17c are made of metal, the inner teeth 17c are likely to bite into the outer peripheral surface of the pipe, and the retaining function is improved accordingly.

FIG. 6 shows a state in which, instead of the pipe P of FIG. 1, a pipe P'on which a stiffener S is mounted is inserted into the receptacle 110 of the insertion joint 100. Since the structure and function of the retaining ring 1 are the same as those described in FIG. 1, the reference numerals used in FIG. 1 are given to the same portions in FIG. 6, and detailed description thereof will be omitted. 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 this retaining ring 1, the outer peripheral surface 13 and the inner peripheral surface having the projection group 12 are concentric. Further, the metal circular oval ring 17 has the largest cross-sectional area at the point a on the opposite side of the oval portion 17a, and the cross-sectional area gradually decreases from the point a closer to the oval portion 17a. ing. In such a metal ring 17, the force required for expanding the diameter thereof is maximum at the position a on the opposite side of the lacked circular portion 17a, and becomes smaller as it approaches the missing circular portion 17a. For this reason, in the retaining ring 1, a beam of uniform strength is obtained which extends in the circumferential direction toward the missing circle portion 15 with the above-mentioned location a as a fulcrum. Since such a retaining ring 1 fits in the tube and maintains a perfect circular shape even when the diameter is expanded, the projection group 12 uniformly contacts the outer peripheral surface of the tube, which is a function of the retaining function. Helps increase credibility. A uniform strength beam can also be obtained by making the outer peripheral surface 13 and the inner peripheral surface 14 eccentric in a cut-out retaining ring made entirely of hard synthetic resin as shown in FIG. However, when this is accommodated and held in the receptacle of the insertion joint, the inner peripheral surface 14 is largely eccentric with respect to the receptacle, which hinders the insertion of the pipe and becomes unusable for practical use.

In the retaining ring 1 in each of the embodiments described above, the metal ring 17 is held by the holder to be positioned at a predetermined position in the molding space of the mold, and in that state, the synthetic resin is placed in the molding space. Although it is possible to manufacture by using the insert molding method of pouring, when such 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 inner surface side is always exposed. Therefore, for example, in the insertion joint 100 using the retaining ring 1 as described in FIGS. 2 and 3, when the pipe P moves in the arrow X direction with the retaining ring 1 from the state of FIG. While the pull-out prevention ring main body 16 is applied with a tensile force in the arrow X direction, the ring 17 is prevented from moving in the arrow X direction due to the constricted tapered surface 120 that prevents movement in the arrow X direction. There is a risk of peeling off from the ring body 16. Then, the two are separated from each other by a simple oval shape such that the oval portion 17a and the oval portion 16a of the omission-preventing ring body 16 coincide with each other like the ring 17 in the omission-preventing ring 1 described with reference to FIG. In such a retaining ring 1, peeling occurs first near the end of the ring 17 including the cutout portion 17a, which triggers the ring 17. It has been found that the middle part or the whole of the part of the retaining ring is detached from the retaining ring body 16.

The retaining ring 1 according to the invention of claim 3 is made in view of such a situation, and FIG. 9 shows its embodiment in a sectional view. In this ring, the ring 17 has a predetermined length portion including the end faces of both end portions 17d, 17d curled radially inward, and the curled both end portions 17d, 17d are made of synthetic resin of the retaining ring body 16. It is completely embedded inside the layer. Further, although the intermediate portions except the both end portions 17d, 17d are embedded in the retaining ring main body 16, a part of the outer surface is exposed to the outer peripheral surface side of the retaining ring main body 16. Other matters are the same as those described with reference to FIGS.

According to the retaining ring 1, since both ends 17d, 17d of the ring 17 are embedded inside the synthetic resin layer of the retaining ring main body 16, peeling at the both ends 17d, 17d occurs. This is unlikely to occur, and as a result, the situation in which the ring 17 is peeled off from the retaining ring body 16 and detached is unlikely to occur. In addition, the retaining ring 1 is shaped in that state when it is insert-molded and the portion exposed on the outer peripheral surface side of the retaining ring main body 16 is held by a holder and positioned at a predetermined position in the molding space. Since it is possible to inject synthetic resin into the space and perform insert molding, insert molding can be performed easily.

10 to 12 show modifications of the retaining ring 1 according to claim 3, which differ only in the cross-sectional shape of the ring 17. That is, in FIG. 10, the ring 17 having a T-shaped cross section is embedded in the retaining ring body 16, and in FIG. 11, the ring 17 having a V-shaped cross section is embedded in the retaining ring body 16. In FIG. 12, the ring 17 having an L-shaped cross section is embedded in the retaining ring body 16, and both ends of the ring 17 are curled radially inward. It is embedded inside the synthetic resin layer of the retaining ring body 16.

FIG. 13 shows another embodiment of the invention of claim 3. In the retaining ring 1, a ring made of a metal bent in a wavy shape is used as the ring 17, and the predetermined length portions of both end portions 17d, 17d including the end face of the ring 17 are the retaining ring main body. A portion 17e that is embedded inside the synthetic resin layer 16 and forms a mountain-shaped top portion of the ring 17 is exposed to the outer peripheral surface side of the retaining ring main body 16. When the retaining ring 1 is manufactured, the retaining ring 1 is positioned at a predetermined location in the molding space with the retainer holding the location 17e forming the chevron top of the ring 17.

In each of the retaining rings 1 described with reference to FIGS. 9 to 13, the retaining ring main body 16 is provided with the outer peripheral surface 13 and the inner peripheral surface 14 having the projection group 12 concentrically, and is made of a metal ring. It is also possible to adopt a configuration in which the force required for expanding the diameter of 17 is maximum at the location on the opposite side of the lacked circle and becomes smaller from that location to the location closer to the lacked circle. Although not shown in the figure, the cross-sectional area of the ring 17 is the largest at the opposite side of the open circle, and it is effective to gradually reduce the cross-sectional area from that area to the open circle. Such a structure corresponds to the retaining ring according to the invention of claim 4.

[0033]

[Effect of device]

 According to the invention of claim 1, since it is possible to increase the rigidity of the retaining ring without increasing the inner diameter, the thickness and the length thereof, it is possible to increase the diameter or length of the socket of the insertion joint. It is possible to provide a retaining ring that can exert a reliable retaining function without lengthening. In addition to such an effect, according to the second aspect of the invention, the group of protrusions uniformly hits the entire outer peripheral surface of the pipe, and the reliability of the retaining function can be enhanced.

According to the invention of claim 3, it is easy to manufacture by applying the insert molding method, and moreover, the end portion of the ring-shaped ring is formed on the outer peripheral surface side of the retaining ring body in the ring-shaped ring. It becomes possible to provide a retaining ring that is difficult to separate from the retaining ring body made of synthetic resin. In addition to such an effect, according to the invention of claim 4, since the projection group uniformly hits the entire outer peripheral surface of the pipe, it becomes possible to enhance the reliability of the retaining function.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a usage 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 cross-sectional view of the retaining ring of FIG.

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 view showing a case where a tube with a stiffener is used as the object.
FIG. 6 is a partial cross-sectional view showing a usage state of the retaining ring according to the embodiment of the 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.

10 is a sectional view of a retaining ring according to a modified example corresponding to the retaining ring of FIG.

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

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

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 cross-sectional view of a conventional retaining ring.

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

[Explanation of symbols]

 1 retaining ring 11 tapered surface 12 group of protrusions 13 outer peripheral surface 14 inner peripheral surface having a group of protrusions 16 missing circular retaining ring body 17 missing circular ring 17a missing circular portion of missing circular ring 17d of missing circular ring End part i Opposite side of missing circle part 100 Plug-in joint 120 Outer constriction taper surface P pipe P1 pipe outer peripheral surface

Claims (4)

[Scope of utility model registration request] 1. A taper surface corresponding to a constricted tapered surface provided on a plug-in joint is provided on an outer peripheral side and is axially engageable with an outer peripheral surface of a pipe inserted into the plug-in joint on an inner peripheral side. A rigid synthetic resin ring-shaped retaining ring body made of hard synthetic resin, and a metal ring-shaped retaining ring embedded in the synthetic resin layer over the entire circumference of the retaining ring body. A retaining ring for an insertion joint, which is characterized by having. 2. A ring-shaped retaining ring body made of hard synthetic resin is concentrically provided with an outer peripheral surface thereof and an inner peripheral surface having a group of protrusions, and the metal ring-shaped retaining ring has an expanded diameter. 2. The retaining ring for a plug-in joint according to claim 1, wherein the force required for is maximum at a location on the opposite side of the missing circle portion, and becomes smaller from that location toward the missing circle portion. 3. A taper surface corresponding to an outer tapered surface provided on the insertion joint is provided on the outer peripheral side and is axially engageable with the outer peripheral surface of the pipe inserted into the insertion joint on the inner peripheral side. A rigid synthetic resin ring-shaped retaining ring body made of hard synthetic resin, and a metal ring-shaped retaining ring embedded in the synthetic resin layer over the entire circumference of the retaining ring body. The ring-shaped ring has a predetermined length portion including the end faces of both end portions embedded in the synthetic resin layer of the retaining ring body, and at least a part of the intermediate portion excluding both end portions thereof is retained. A retaining ring for a plug-in joint, which is exposed on the outer peripheral surface side of the ring body. 4. A ring-shaped retaining ring body made of hard synthetic resin, the ring-shaped retaining ring body being concentrically provided with an outer peripheral surface thereof and an inner peripheral surface having a group of protrusions, and the metal ring-shaped retaining ring having an expanded diameter. The retaining ring for a plug-in joint according to claim 3, wherein the force required for is maximum at a location on the opposite side of the missing circle portion, and becomes smaller from that location toward the missing circle portion.