JPH0525094U - Synthetic resin corrugated pipe fittings - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if a synthetic resin corrugated pipe equipped with a covering sheet is strongly pulled, the end of the corrugated pipe does not slip through the protruding portion of the retaining ring provided in the joint. To [Structure] The retaining ring 3 is made of synthetic resin, and a pointed protrusion 34 that protrudes forward from the protruding portion 32 of the retaining ring 3
Are provided integrally. The end of the synthetic resin corrugated pipe A provided with the covering sheet S has the protrusion 32 of the retaining ring 3 and the joint body 1
When being pressed and held in a crushed state by and, the protrusion 34 bites into the end of the covering sheet S or the crushed corrugated tube A.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joint for a synthetic resin corrugated pipe used in a pipe that handles flammable gas or water.

[0002]

[Prior Art]

 As the conventional general joint used in the above-mentioned piping at the connection between the corrugated pipes and the connection between the corrugated pipe and the straight pipe, the one having the structure shown in FIG. 5 has been known.

This one has a retaining ring 120 with a split shape that is set in the connection port 101 when the push ring 110 is screwed into the tubular connection port 101 formed in the joint body 100. By pushing the end portion A1 of the corrugated pipe A forwardly by pushing the end portion A1 of the corrugated pipe A that is previously engaged with the trough portion a1 of the corrugated pipe A set in the connection port 101. The end portion A1 of the corrugated pipe A can be pressed against the annular convex portion 102 provided in the joint body 100 by the pressing action of.

According to this joint, when the push ring 110 is completely tightened, the protrusion 121 of the retaining ring 120 and the protrusion 102 of the connection port 101 allow the end portion A1 of the corrugated tube A to be positioned 1 About 3 to 3 peaks are held in a crushed state, and the convex portion 102 of the connection port portion 101 and the end portion A1 of the corrugated pipe A come into close contact with each other. Further, a rubber ring 130 such as an O-ring is housed in a recess 103 formed in the outer peripheral portion of the convex portion 102 of the connection port portion 101, and the rubber ring 130 is compressed by the end portion A1 of the corrugated pipe A. There are also those that are designed to seal the above-mentioned contact points.

However, since the corrugated tube A is relatively easily deformed due to its flexibility, the end portion A1 of the corrugated tube A pressed by the overhanging portion 121 of the retaining ring 120 is deformed during the connection work. If the corrugated tube A is forcibly pushed into the annular convex portion 102 or if the corrugated tube A is strongly pulled in the pulling direction after connection, the corrugated tube A held by the overhanging portion 121 and the convex portion 102 is retained. There was a concern that the end portion A1 of this would extend and slip through the inside of the overhang portion 121.

Therefore, the applicant of the present application, as shown in FIG. 6, is a joint provided with a protrusion 104 fitted on the end portion A1 of the corrugated tube A and supporting the end portion A1 from the inside on the inner peripheral portion of the convex portion 102. Was proposed first.

[0007]

[Problems to be solved by the device]

 By the way, if the corrugated pipe A is not as weatherproof as the polyethylene pipe, it is necessary to protect the corrugated pipe A by covering it with polyvinyl chloride resin, which is more weather resistant than the polyethylene pipe. May be covered.

However, as shown in FIG. 6, the end portion A1 of the corrugated tube A thus coated with the coating sheet is provided with the protruding portion 121 of the retaining ring 120 and the convex portion 102 of the joint body 100 or the rubber ring 13 0. As shown in the figure, the tip S1 of the covering sheet S may be caught between the end portion A1 of the corrugated tube A and the rubber ring 130 or the convex portion 102 when held by being crushed. Sometimes. When such a situation occurs, when the corrugated pipe A is strongly pulled in the pulling direction, the end portion A1 of the corrugated pipe A is supported by the protrusion 104, but the end portion of the end portion A1 is not supported. Sometimes A1 slipped through the cover sheet S and slipped through it. Further, fluid may leak between the clothing sheet S and the corrugated tube A. In this case, the tip S1 of the cover sheet S is still sandwiched by the end A1 of the corrugated tube A and the rubber ring 130 or the convex portion 102.

The present invention has been made in view of the above circumstances, and the tip of the covering sheet is made to be the end of the corrugated pipe and the convex portion of the joint body or the rubber ring by improving the protruding portion of the retaining ring. It is an object of the present invention to provide a joint capable of preventing the corrugated pipe from slipping through the cover sheet and preventing fluid leakage from being caught between the cover sheet and the cover sheet.

[0010]

[Means for Solving the Problems]

 The joint of the synthetic resin corrugated pipe according to the present invention has substantially the same structure as the joint described above, and the retaining ring in the joint is made of synthetic resin, and the retaining ring is projected to the inner circumference of the protruding portion in front of the protruding portion. The pointed projections are integrally provided.

[0011]

[Action]

 According to this configuration, when the end portion of the corrugated pipe is held in the collapsed state between the projecting portion of the retaining ring and the projecting portion of the joint body in a crushed state, the pointed tip provided on the projecting portion is held. The protrusions are biting into the end of the crushed corrugated pipe, and the end is more reliably held in a compressed state than when there is no protrusion. Further, when the corrugated pipe is provided with a covering sheet, the portion of the covering sheet covering the end of the corrugated pipe is pulled by the protrusion during the process in which the protrusion bites into the end of the corrugated pipe. The tip of the lever is released from between the end of the corrugated pipe and the protrusion.

Further, since the retaining ring is made of synthetic resin, the peculiar flexibility of the synthetic resin is exhibited, and the occurrence of a situation in which the corrugated pipe made of synthetic resin is broken by the protrusion is prevented.

[0013]

【Example】

 1, 2 and 3 are cross-sectional views showing the use state of a joint of a synthetic resin corrugated pipe according to an embodiment of the present invention, and FIG. 4 is a main part of the joint applied to a corrugated pipe covered with a covering sheet. FIG.

Reference numeral 1 denotes a joint body having a tubular connection port portion 10. The connection port portion 10 has an internal thread 11 formed at one end thereof, and a tapered guide surface is provided at the terminal end of the internal thread 11. A small-diameter stepped portion 13 having 12 is formed, an annular convex portion 14 is further formed at the inner end of the stepped portion 13, and an annular protrusion 16 is formed on the inner peripheral portion of the convex portion 14. At the same time, the concave groove 15 is formed in an annular shape around the convex portion 14.

The illustrated fitting body 1 has a straight pipe connection port 1a at the other end (see FIG. 3). However, instead of this connection port 1a, the above-mentioned tubular connection port 10 is used. It may be provided with a connection port of the same structure, which itself is preferably used as a joint for relaying corrugated pipes. Further, the joint body 1 may have a connection opening portion having the same structure as the connection opening portion 10 in a T shape or a cross shape.

Reference numeral 2 denotes a push ring, which has an outer screw 21 at the tip and has an inner surface of the tip which is an outwardly tapered tapered contact portion 22. The outer thread 21 of the push ring 2 is screwed onto the inner thread 11 of the connection port 10 of the joint body 1.

Reference numeral 3 denotes a retaining ring made of a synthetic resin and formed of a synthetic resin, which is formed in a truncated circular shape or a split shape, and an annular projecting portion 32 is provided inward at the front end of the cylindrical portion 31. In addition, a pointed projection 34 projecting forward of the overhanging portion 32 is integrally provided on the inner circumference of the overhanging portion 32 in an annular shape, and the connecting port 10 is formed on the outer circumference of the overhanging portion 32. A tapered surface 33 that slides on the guide surface 12 is formed. Further, on the outer periphery of the rear end of the cylindrical portion 31, a taper surface 35 which slides on the contact portion 22 of the push wheel 2 is formed. The retaining ring 3 has an inner diameter in the natural state of the overhanging portion 32 that is larger than the outer diameter of the peak portion a2 of the corrugated pipe A, and contracts against its own elasticity. When the diameter is increased, the inner diameter of the overhang 32 is equal to or slightly smaller than the outer diameter of the valley a1 of the corrugated pipe A.

When connecting the corrugated pipe A, as shown in FIG. 1, the corrugated pipe A is fitted into the connection opening 10 of the retaining ring 3 and the projection 16 of the joint body 1 is fitted into the end A1 thereof. After inserting the end portion A1 to a position where the end portion A1 is supported by the protrusion 16 from the inside, screw the push ring 2 meshed with the connection port portion 10 in the arrow X direction in FIG. By doing so, the retaining ring 3 is pushed back by the abutting portion 22 of the push ring 2, and the guide surface 12 of the connection port 10 slides on the tapered surface 33 of the retaining ring 3 so that the retaining ring 3 is pushed. While moving forward while reducing the diameter, the overhanging portion 32 and the protrusion 34 of the retaining ring 3 mesh with the valley portion a1 of the corrugated tube A at an intermediate stage to push forward the end portion A1 of the corrugated tube A.

A state in which the push ring 2 is completely screwed in (in this state, the tapered surface 33 of the retaining ring 3 exceeds the guide surface 12 and the retaining ring 3 is backed up from the outside by the inner surface of the stepped portion 13. 3), as shown in FIG. 3, a few peaks of the end A1 of the corrugated pipe A are crushed and held between the protrusion 32 and the protrusion 32 and the protrusion 34 of the retaining ring 3 in a crushed state. At the same time, it is supported from the inside by the projection 16 of the joint body 1, and the end A1 of the corrugated tube A is in close contact with the projection 14 and the tapered surface 16a of the projection 16 to form an airtight seal. Further, the pressed end portion A1 of the corrugated pipe A is engaged with the overhanging portion 32 and the protrusion 34 of the retaining ring 3 in the pulling direction to be retained. In particular, since the end A1 of the corrugated pipe A is supported from the inside by the protrusion 16 of the joint body 1, even if the corrugated pipe A1 is strongly pulled in the pulling direction, the compressed end A1 of the corrugated pipe A is While deforming, it is unlikely that it will slip through the inside of the overhanging portion 32 of the retaining ring 3 and be pulled out, and a sufficiently large pull-out strength is secured.

By the way, when the covering sheet S is covered on the corrugated pipe A as shown in FIG. 4, the end portion A1 of the corrugated pipe A and the protrusion 32 and the protrusion 34 of the retaining ring 3 and the joint body 1 are When it is sandwiched and held between the convex portion 14 and the convex portion 14, the covering sheet S is pinched between the end portion A1 of the crushed corrugated tube A and the protruding portion 32 or the protrusion 34 of the retaining ring 3. Be done. The pressure holding force at this time is remarkably large as compared with the case without the protrusion 34. When the protrusion 34 begins to bite into the end A1 of the corrugated tube A during the process of screwing in the push ring 2, the bite point of the protrusion 34 at the end A1 of the corrugated tube A gradually becomes depressed, and as it goes along. The cover sheet S 1 is pulled by the protrusion 34, and the tip S 1 of the cover sheet S 2 is released from between the end A 1 of the corrugated tube A 1 and the convex portion 14 of the joint body 1. Therefore, when the push ring 2 is completely screwed in and the joint and the corrugated pipe A are connected, the tip S1 of the covering sheet S is sandwiched between the end A1 of the corrugated pipe A and the convex portion 14 of the joint body 1. It will not be crowded.

When the corrugated pipe A is connected to the joint in the state of FIG. 4, when the corrugated pipe A1 is strongly pulled in the pulling direction, the covering sheet S remains at the original position and the corrugated pipe A is covered. Since it is unlikely that the seat S will slip through and slip through, the corrugated tube A is securely prevented. And, together with the supporting action of the projection 16 of the joint body 1 described above, a more reliable retaining action is exhibited.

Further, the protrusion 34 of the retaining ring 3 has a pointed shape, but the synthetic resin, which is the material thereof, exhibits peculiar flexibility, so that the corrugated tube A made of synthetic resin is broken by the protrusion 34. The situation of being refused does not occur.

If a rubber ring 4 such as an O-ring is inserted in the groove 15 in advance, when the push ring 2 is completely screwed in, the rubber ring 4 is pushed by the end portion A1 of the corrugated pipe A that is pressed. It is compressed and comes into pressure contact with the surfaces on both sides of the concave groove 15 to seal the periphery of the above-mentioned airtightly sealed portion.

In the above description, the joint of the type in which the push ring 2 is screwed into the joint body 1 and inserted is described, but the present invention is not limited to this, and the push ring can be inserted by another means, for example, by fastening the flanges together to form a tubular shape of the joint body. Alternatively, it may be inserted into the connection port portion of

[0025]

[Effect of the device]

 According to the present invention, the tip of the covering sheet covering the corrugated pipe is not pinched by the end portion of the crushed corrugated pipe and the joint body, so that when the corrugated pipe is strongly pulled in the drawing direction. In addition, it is less likely that the edge will slip through the cover sheet and slip through, which will improve the pull-out resistance. In addition, since the projection bites into the end of the crushed corrugated pipe, the projection holding force of the end due to the projection or overhanging portion and the projection of the joint body becomes large, which results in the above pull-out resistance. It helps to further improve strength. Further, since the end of the corrugated pipe directly contacts the joint body without the interposition of the covering sheet, the sealing property at that portion is not obstructed by the covering seal.

[Brief description of drawings]

FIG. 1 is a sectional view showing an initial stage of use of a joint of a synthetic resin corrugated pipe according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a usage state of a joint of a synthetic resin corrugated pipe in the next stage of FIG.

FIG. 3 is a cross-sectional view showing a usage state of a joint of a synthetic resin corrugated pipe in the next stage of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part of the joint applied to a corrugated pipe covered with a covering sheet.

FIG. 5 is a sectional view of a conventional example.

FIG. 6 is an enlarged cross-sectional view of a main part of a comparative example.

[Explanation of symbols]

 1 Fitting body 2 Push ring 3 Lock ring 10 Connection port 14 Fitting body convex part 31 Cylindrical part 32 Overhang part 34 Protrusion A Corrugated pipe A1 Corrugated pipe end a1 Corrugated pipe trough

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Jiro Nakai, 1-5-20 Kaigan, Minato-ku, Tokyo Tokyo Gas Co., Ltd. (72) Seiichi Ikeda 1-5-20, Kaigan, Minato-ku, Tokyo Tokyo Gas Incorporated (72) Hiroshi Morita, 1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor, Hiroshi Ueda 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka In Osaka Gas Co., Ltd. (72) Inventor Teruo Washimi 19-18 Sakurada-cho, Atsuta-ku, Nagoya-shi, Aichi Toho Gas Co., Ltd. Coupling Co., Ltd. (72) Inventor Tomohiro Okumura One day at 153 Tajime-cho, Kishiwada City, Osaka Pref.

Claims (1)

[Scope of utility model registration request] 1. A retaining ring having an inwardly projecting annular protrusion at the front end of a cylindrical portion is pushed backward by a push ring inserted into the connection port of a joint body having a tubular connection port, and the joint is The end portion of the corrugated pipe is pressed against the annular convex portion formed on the joint body by the protruding portion of the retaining ring fitted in the valley of the end portion of the synthetic resin corrugated pipe inserted into the main body. In a joint of a synthetic resin corrugated pipe in which the end of the corrugated pipe is held in a crushed state by the convex portion and the overhanging portion, the retaining ring is made of synthetic resin, and A joint for a synthetic resin corrugated pipe, characterized in that a pointed protrusion projecting forward of the overhanging portion is integrally provided on the inner circumference.