JP2012117555A - Dustproof cap for joint - Google Patents

Abstract

The present invention provides a dustproof cap for a joint that is firmly attached to a pipe insertion side of a joint to exhibit high dustproofness, closes a gap with the joint, improves adhesion, and can be easily attached and detached with one touch.
A joint dustproof cap for dustproofing a pipe insertion port 10 between an inner peripheral surface 9 of a joint body 1 and an outer peripheral surface 8 of a cylindrical core portion 3 provided integrally or separately in the joint body 1. . The joint dustproof cap includes an annular protrusion 41 formed of an annular hollow groove 42 formed on one side of a circular thin plate, an outer ring flange surface 43 formed on the outer periphery of the annular protrusion 41, and an inner side of the annular protrusion 41. The cap body 40 is constituted by the recessed surface 44 formed on the inner surface, the annular protrusion 41 is fitted into the pipe insertion port 10, and the outer ring flange surface 43 is brought into contact with the outer end surface 20 of the joint body 1. It is.
[Selection] Figure 4

Description

  The present invention relates to a dust cap for a joint that is attached to the pipe insertion side of the joint so as to protect the inside of the joint from dust and dirt.

Conventionally, as this type of joint cap, for example, a plug-like cap formed of a material such as polypropylene by injection molding or the like and mounted on the outer peripheral side or the inner peripheral side of the joint end is known. ing. Among these, as a cap mounted on the outer peripheral side of the joint end, for example, a poly stopper disclosed in Patent Document 1 is known. This poly stopper has a cylindrical shape with a lid, and is fitted to the outer periphery of the tip having a pipe insertion port of the joint to protect the inside of the joint. Usually, such a poly stopper is fitted using the elasticity of the material.
On the other hand, the cap mounted on the inner peripheral side of the pipe end has a bottomed cylindrical portion that fits on the inner peripheral side of the joint, and a flange-shaped flange portion formed on one end side of the cylindrical portion. The shape has become common. In this cap, the cylindrical portion is fitted to the inner peripheral side of the joint, so that the cap is prevented from coming out and the inside of the joint is protected.

  On the other hand, in the joint of the literature 2, an adhesive seal member is affixed to the joint end face of the pipe insertion port as dust-proof means inside the joint. The adhesive seal member covers the pipe insertion port and accommodates the core ring inside the joint to prevent the core ring from falling off, and also serves as a marking tool for confirming the amount of pipe inserted.

  On the other hand, the joint of the document 3 has a structure in which a core ring is integrated, and a resin-molded dust-proof cap is inserted and fitted into the inner diameter part of the core, and this dust-proof cap serves as dust-proof means inside the joint. The dust cap also serves as a gauge function for marking that confirms the amount of pipe inserted. As the marking means using the dust-proof cap, an adhesive seal member is often used, such as drawing with a pen, or the same document 2.

Japanese Patent Laid-Open No. 2004-217724 JP 2000-170975 A JP 2008-25660 A

However, among the cap-shaped caps, the cap attached to the outer peripheral side of the joint end as in Patent Document 1 is externally fitted to the joint using the elastic characteristics of the material. Dimensional variations can cause dimensional accuracy problems and the fit can be too strong or weak. For this reason, there is a possibility that the cap is difficult to attach to and detach from the joint, or that the cap after being attached is easily loosened and detached from the joint.
In the case of a cap attached to the inner peripheral side of the joint end, the fitting part to the inner peripheral side of the joint is a covered cylindrical part, so it is difficult to obtain elastic force in the inner diameter or outer diameter direction. The force that fits into the joint is weakened. For this reason, this cap has weakened the adhesion to the joint, making it difficult to prevent the intrusion of dust and dirt, and has been easily removed from the joint.

  On the other hand, in the joint of the same literature 2, although it is going to acquire dustproof property by the adhesive seal member which also serves as a means for clearly indicating the amount of pipe inserted, when this adhesive seal member is attached to the joint as dustproof means, Since it was necessary to apply the paste while aligning it with the center of the cylindrical end face, it took time and effort to apply it. Even when pipes are joined, it is necessary for the piping operator to remove the adhesive seal member from the joint end face by two-handed work. Furthermore, it is necessary to provide this adhesive seal member with a material that does not adversely affect the sealing performance between the joined pipe and joint.

  Since the dust cap in the literature 3 is only inserted into the core inner diameter portion, the fitting force to the core inner diameter portion is weak, and as a result, a gap is generated between the dust cap and the joint end portion to prevent dust. May be inferior. Furthermore, as in the same document 2, when sticking the adhesive seal member as a means for clearly indicating the amount of pipe inserted, it takes time to work, and it also takes time to peel off the adhesive seal member during pipe joining work. Furthermore, since this dustproof cap has a shape that requires injection molding, it has been expensive to manufacture the mold.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to firmly attach the joint to the pipe insertion side in a state where the gap with the joint is closed and the adhesion is improved. Another object of the present invention is to provide a dust cap for a joint that can exhibit high dust resistance and can be easily attached and detached with a single touch.

  In order to achieve the above object, the invention according to claim 1 is a joint for dust-proofing a pipe insertion port between an inner peripheral surface of a joint body and an outer peripheral surface of a cylindrical core part provided integrally or separately in the joint body. A dust-proof cap for an annular projection formed of an annular hollow groove formed on one side of a circular thin plate, an outer ring flange surface formed on the outer periphery of the annular projection, and a concave surface formed on the inner side of the annular projection This is a joint dust-proof cap in which a cap body is formed by fitting an annular protrusion into a pipe insertion port, and an outer ring flange surface is brought into contact with the outer end surface of the joint body.

  The invention according to claim 2 is a dust cap for a joint in which the outer surface of the concave surface is slightly projected from the outer surface of the outer ring flange surface to the other side surface of the cap body.

  The invention according to claim 3 is a joint in which a mortar surface is formed on the outer end surface of the joint body, and when the concave surface of the cap body is pressed, the outer ring flange surface of the cap body warps in a mortar shape on the mortar surface. It is a dust cap for joints made to contact in the state.

  The invention according to claim 4 is a joint for joining pipes having different inner and outer diameters, and the outer diameter of the annular protrusion is fitted to the inner periphery of the pipe insertion port, or the inner diameter of the annular protrusion is made to be a cylindrical core. It is the dustproof cap for joints which was made to fit on the outer periphery of a part.

  The invention according to claim 5 is an annular projection formed of an annular hollow groove formed on one side surface of a circular thin plate, an outer ring flange surface formed on the outer periphery of the annular projection, and a recess formed on the inner side of the annular projection. This is a joint dustproof cap in which a cap body is constituted by a surface, an annular protrusion is fitted into a pipe insertion port of the joint body, and an outer ring flange surface is brought into contact with the outer end face of the joint body.

  The invention according to claim 6 is a joint in which a cylindrical core portion to be inserted into a pipe is accommodated in a joint body, and the annular protrusion is placed in the cylindrical core portion in a state where the cylindrical core portion is accommodated in the joint body. It is a dust-proof cap for a joint that is fitted and has an outer ring flange surface in contact with the outer end surface of the cylindrical core portion and the outer end surface of the joint body.

  In the invention according to claim 7, the cap body is a dust cap for a joint produced by vacuum forming a resin circular thin plate.

According to the first aspect of the present invention, the annular protrusion is provided on the cap body, the annular protrusion is fitted into the pipe insertion port of the joint, and the outer ring flange surface is brought into contact with the outer end surface of the joint body to insert the pipe. Since the mouth is dust-proof, the gap between the ring-shaped protrusion and the joint can be closed to improve the adhesion, and the joint can be firmly attached to the joint while exhibiting high dust resistance.
At the time of mounting on the joint, the annular protrusion is guided by the outer peripheral surface of the pipe insertion port, so that it can be easily mounted at a predetermined position without being aligned. On the other hand, when removing, it can be easily removed by inserting a nail or a finger into the outer ring flange surface. In this way, it can be easily attached and detached with one hand.
Further, since the pipe end is closed by the outer ring flange surface to prevent dust, when there is print information on the outer peripheral surface of the joint body on the cap mounting side, the print information is not blocked by the dust cap. Since the outer flange surface can be formed with a small diameter, it can contribute to resource saving by reducing the material used. Moreover, since variations in dimensions at the time of molding can be absorbed, the dimensional accuracy at the time of manufacture can be relaxed and mass production can be easily performed.

  According to the second aspect of the invention, the annular projection is further pushed into the pipe insertion port by pressing the concave surface from the state inserted in the joint, and the outer ring flange surface is brought into strong contact with the pipe insertion port by this pushing. By increasing the adhesion between the outer ring flange surface and the pipe insertion port, high dust resistance can be exhibited.

  According to the invention of claim 3, the outer ring flange surface is brought into contact with the mortar surface in a state where the outer ring flange surface is warped by pressing the concave surface, so that the outer end side of the joint and the end of the outer ring flange surface end. It is possible to easily remove the cap by one-handed operation by opening a V-shaped opening in between and inserting a nail or finger into this gap.

  According to the invention according to claim 4, when joints having different pipe insertion diameters are used to join pipes having the same nominal diameter and different inner and outer diameters, an annular protrusion is used for a joint for pipes having a small outer diameter. The outer diameter of the annular projection is fitted to the inner periphery of the pipe insertion opening, and the inner diameter of the annular protrusion is fitted to the outer periphery of the cylindrical core portion in the case of a pipe joint having a large outer diameter. For this reason, one kind of dustproof cap can be commonly used for joints having different pipe insertion diameters. At that time, in any case, natural loosening and slip-out are prevented, and it can be mounted in a state where high dust resistance is exhibited.

According to the fifth aspect of the present invention, even when mounting on a joint body having an outer peripheral seal structure in which a pipe is seal-connected to the inner peripheral surface of the pipe insertion port, the gap between the joint and the joint is improved by the annular protrusion, thereby improving the adhesion. Can be firmly attached to the joint while exhibiting high dust resistance.
At the time of mounting on the joint, the annular protrusion is guided by the outer peripheral surface of the pipe insertion port, so that it can be easily mounted at a predetermined position without being aligned. On the other hand, when removing, it can be easily removed by inserting a nail or a finger into the outer ring flange surface. In this way, it can be easily attached and detached with one hand.
Further, since the pipe end is closed by the outer ring flange surface to prevent dust, when there is print information on the outer peripheral surface of the joint body on the cap mounting side, the print information is not blocked by the dust cap. Since the outer flange surface can be formed with a small diameter, it can contribute to resource saving by reducing the material used. Moreover, since variations in dimensions at the time of molding can be absorbed, the dimensional accuracy at the time of manufacture can be relaxed and mass production can be easily performed.

  According to the invention which concerns on Claim 6, a cap can be attached or detached in the state which accommodated the cylindrical core part inserted and inserted in a pipe in the inside of a joint main body, and the outer ring flange surface is attached in the state which fitted the annular projection part in the cylindrical core part. By contacting the outer end surface of the cylindrical core portion and the outer end surface of the joint body, the cap is firmly attached in a state in which the cylindrical core portion is prevented from coming out, and high dust resistance is exhibited.

  According to the seventh aspect of the invention, it is possible to easily provide a mold as compared with an injection molded product, and it is also easy to increase the number of parts, so that the cost at the time of vacuum molding can be significantly reduced. . At the time of production, it is possible to give the surface various kinds of decoration and functionality by forming a textured or silk-printed sheet, etc. Furthermore, depending on the diameter and material of the joint, the wall thickness can be increased. Since it is easy to set in a wide range, it can be applied to various joints.

It is a perspective view which shows the state which removed the dustproof cap for joints of this invention from the joint main body. It is a perspective view which shows the state which mounted | wore the joint main body with the dustproof cap for joints of FIG. FIG. 2 is an enlarged right side view of FIG. 1. It is a longitudinal cross-sectional view which shows the state which mounted | wore the joint main body with the dustproof cap for joints of this invention. It is a longitudinal cross-sectional view which shows the state which pushed in the dustproof cap for joints of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore with the cap for polybutene pipes to the coupling main body. It is the longitudinal cross-sectional view which showed other embodiment of the dustproof cap for couplings of this invention.

  Hereinafter, preferred embodiments of a dust cap for a joint according to the present invention will be described in detail with reference to the drawings. In FIG. 1, the state which removed the dustproof cap for joints of this invention from the joint main body is shown, and in FIG. 2, the state which mounted | wore the joint main body with the dustproof cap for joints of FIG. 1 is shown.

  First, for convenience, a preferred embodiment of a joint to which the protective cap for joint of the present invention is attached will be described. The joint body 1 is formed so that the joining pipe P for water supply / hot water supply can be joined in a retaining state. The joining pipe P is made of, for example, a resin pipe such as a cross-linked polyethylene pipe or a polybutene pipe. Besides these, a resin pipe such as a metal reinforced polyethylene pipe or a metal pipe such as a copper pipe is used. Also good. In this case, the outer diameter and the inner diameter may be different even if the resin pipe is a pipe P having the same nominal diameter. For example, in the case of the pipe P having a nominal diameter of 16A, the outer diameter—the inner diameter is φ21.5 mm−. There are cases where φ16.2 mm, φ21.5 mm-φ15.6 mm, φ22.0 mm-φ16.8 mm. Of these, the pipe P having an outer diameter of 21.5 mm-an inner diameter of 16.2 mm, an outer diameter of 21.5 mm-an inner diameter of 15.6 mm is a cross-linked polyethylene pipe, and the pipe P having an outer diameter of 22.0 mm-inner diameter of 16.8 mm is a polybutene. It is a tube.

  In FIG. 1 thru | or FIG. 5, the coupling main body 1 becomes a structure which can join the pipe P by what is called an inner peripheral seal structure mentioned later, the coupling part 2, the cylindrical core part 3, the outer cylinder 4, the cover member 5, A lock ring 6, a seal member 7 made of an O-ring, and an insertion guide 15 are provided.

  4 and 5, the joint portion 2 is formed in a cylindrical shape with a highly rigid resin such as a metal such as a copper alloy or PPS (polyphenylene sulfide resin), and has a flow passage port 2 a for water passage therein. Have. A cylindrical core portion 3 is formed integrally with the joint portion 2 and an outer cylinder 4 is attached thereto.

The cylindrical core portion 3 is provided on the pipe P joint side of the joint portion 2 with a predetermined outer diameter corresponding to the inner diameter of the pipe P. In this case, the outer diameter of the cylindrical core 3 is different between the pipe P of the cross-linked polyethylene pipe and the pipe P of the polybutene pipe having the same nominal diameter. For example, in the case of the joint body 1 for the nominal diameter 16A, the outer diameter of the cylindrical core portion 3 for the crosslinked polyethylene pipe is φ16.2 mm, which is substantially the same diameter as the inner diameter of the crosslinked polyethylene pipe. The diameter is formed to φ16.8 mm, which is substantially the same diameter as the inner diameter of the polybutene tube. The cylindrical core portion 3 may be a separate body from the joint portion 2, and in this case, a structure that prevents the cylindrical core portion from falling off while the cylindrical core portion provided separately is accommodated in the joint body 1. It may be provided in
A pipe insertion port 10 is formed between the outer peripheral surface 8 of the cylindrical core portion 3 and the inner peripheral surface 9 constituted by the outer cylinder 4 and the lid member 5, and the pipe P is inserted into the pipe insertion port 10 and joined. Is done.

  Mounting grooves 11 and 11 are formed at two positions on the outer peripheral surface 8 of the cylindrical core portion 3 facing the lock ring 6, and a rubber O-ring 7 such as EPDM is mounted in the mounting groove 11. ing. Although not shown, a lubricant for smooth insertion of the pipe P is applied to the O-ring 7, and the inner peripheral surface of the pipe P and the joint body 1 are hermetically sealed by the O-ring 7.

  An uneven engagement portion 12 is formed on the outer periphery of the joint portion 2, and the outer cylinder 4 is attached to the engagement portion 12. A male screw portion 13 is provided on the other side of the joint portion 2 with respect to the cylindrical core portion 3, and a header, a connecting member, or other external piping (not shown) can be connected to the male screw portion 13. The joint portion 2 may be, for example, a cheese shape or an elbow shape other than the linear shape as illustrated.

  The outer cylinder 4 is formed of a transparent or translucent resin such as non-crystalline nylon or PPSU (polyphenylsulfone resin). Therefore, the insertion state of the pipe P and the insertion guide 15 can be seen through from the outside of the outer cylinder 4.

  An engagement portion 16 that can be snap-fitted with the engagement portion 12 of the joint portion 2 is provided on the inner peripheral side of the outer cylinder 4 attached to the joint portion 2. On the outer peripheral side on the other end side of the outer cylinder 4, an uneven engagement step portion 17 is provided. The outer cylinder 4 is integrated with the joint portion 2 by snap fitting of the engaging portions 12 and 16, and after the fitting, the outer tube 4 and the joint portion 2 can rotate with each other. Although not shown, the inner diameter of the outer cylinder 4 is set to be approximately the same as the outer diameter of the insertion guide 15. An inwardly tapered surface 18 and an R surface 19 gently connecting to the tapered surface 18 are formed on the inner periphery of the outer cylinder 4 on the inlet side.

  The lid member 5 is formed in a cap shape with, for example, a resin such as polyacetal having a higher tensile elastic modulus than the outer cylinder 4 and having transparency. A mortar surface 21 is formed on the outer end surface 20 of the lid member 5, and a C-shaped notch surface 22 is provided on the outer diameter side of the mortar surface 21. The mortar surface 21 is provided in a tapered surface shape that is gently inclined in the axial direction, and a cylindrical inner peripheral surface 23 that forms a part of the inner peripheral surface of the joint body 1 is formed following the mortar surface 21. Has been. The cylindrical inner peripheral surface 23 is formed substantially parallel to the shaft center Q of the joint portion 2, and the cylindrical inner peripheral surface 23 can hold and guide the outer peripheral surface of the pipe P. When the pipe P is inserted, the pipe P is guided while being aligned with the cylindrical inner peripheral surface 23 by the mortar surface 21, and the inner peripheral surface 9 of the joint body 1 including the cylindrical inner peripheral surface 23 and the cylindrical core portion are guided. The outer peripheral surface 8 is inserted into the pipe insertion port 10 in a state where the inclination with respect to the axis Q is suppressed.

  The mortar surface 21 and the cylindrical inner peripheral surface 23 are provided on an annular convex portion 24 formed on the lid member 5. The annular convex portion 24 is formed to project from the inner peripheral end portion side of the lid member 5, and the annular convex portion 24 prevents the lock ring 6 from coming out after the outer cylinder 4 is attached to the joint portion 2. The inner diameter (the inner diameter of the cylindrical inner peripheral surface 23) (not shown) of the annular convex portion 24 is set according to the outer diameter of the pipe P in the same manner as the outer diameter of the cylindrical core portion 3. For example, the inner diameter is larger in the case of a polybutene pipe than in the case where the pipe P is a crosslinked polyethylene pipe.

  An engagement step portion 25 that can be snap-fitted to the engagement step portion 17 of the outer cylinder 4 is formed on the inner periphery of the lid member 5 on the outer cylinder side. The lid member 5 is attached to the outer cylinder 4 by snap fitting of the engaging step portions 17 and 25, and after the attachment, the lid member 5 and the outer cylinder 4 are rotatable relative to each other. At this time, the tip surface of the mortar surface 21 (the outer end surface 20 of the lid member) and the tip surface portion of the cylindrical core portion 3 are disposed on the same plane in the axial center Q direction.

  The lock ring 6 is formed in a substantially annular shape from stainless steel or the like, and has an annular portion 30 and a claw portion 31 on the inner diameter side of the annular portion 30. The claw portion 31 is bent from the annular portion 30 at a predetermined inclination angle and can be locked to the surface of the pipe P. The lock ring 6 is attached to a gap 32 formed between the opening side of the outer cylinder 4 and the inner peripheral portion of the lid member 5. When the pipe P is inserted, the insertion is smoothed by the claw portion 31, and when the extraction load is applied to the pipe P due to the claw portion 31 being locked to the pipe P, the drawing prevention force is exhibited. For this reason, the pipe P is promptly joined in the pull-out preventing state.

  The insertion guide 15 is disposed in the joint body 1 as a guide for the pipe P, and is attached to the pipe insertion port 10 between the O-ring 7 and the lock ring 6. For example, the insertion guide 15 is made of a hard resin such as polyacetal having elasticity, and is colored in an appropriate color. A plurality of elastic tongue pieces 35 are formed on the outer periphery of the insertion guide 15, and the elastic tongue pieces 35 can be locked to an inner diameter convex portion 36 formed on the outer cylinder 4. The elastic tongue 35 can generate a click sound when it passes over the inner diameter convex portion 36, and the operator visually recognizes the click sound and the color colored on the insertion guide 15 from the outer cylinder. It is possible to confirm that the pipe P has been inserted to a predetermined state.

  Due to the internal structure described above, the joint body 1 joins the pipe P while keeping the lock ring 6 from being pulled out, and seals the inner circumference of the pipe P with the O-ring 7 attached to the cylindrical core portion 3. It has a seal structure. This joint body 1 can be handled by replacing the cover member 5 and the joint portion according to the inner and outer diameters of the pipe P when joining pipes P such as cross-linked polyethylene pipes and boribten pipes having the same nominal diameter and different inner and outer diameters. To do. Thus, the joint body 1 is a joint that can join pipes P having the same nominal diameter and different inner and outer diameters.

  Subsequently, a preferred embodiment of the dust cap for a joint according to the present invention will be described. As shown in FIG. 1 and FIG. 2, the dustproof cap for a joint of the present invention (hereinafter referred to as a cap body 40) is mounted from the pipe insertion port 10 of the joint body 1 described above to protect the pipe insertion port 10 from dust. It is.

  The cap body 40 is manufactured by vacuum molding using a resin thin plate material such as translucent polypropylene or PET (polyethylene terephthalate). As shown in FIGS. 4 and 5, the cap body 40 includes an annular protrusion 41, an annular hollow groove 42, an outer ring flange surface 43, and a recessed surface 44, and the annular protrusion 41 is fitted into the pipe insertion port 10. The outer ring flange surface 43 is attached to the joint body 1 with the outer end surface 20 in contact with the outer end surface 20.

  The annular protrusion 41 includes an annular hollow groove 42 formed on one surface side of a circular thin plate, and has an annular outer peripheral surface 45, an annular inner peripheral surface 46, and a semicircular arc portion 47. Of the annular outer peripheral surface 45 and the annular inner peripheral surface 46, the annular outer peripheral surface 45 is formed to have an outer diameter slightly larger than the inner peripheral surface 9 of the joint body, or the annular inner peripheral surface 46 is a cylindrical core portion. The inner diameter is slightly smaller than the outer peripheral surface 8. Accordingly, the outer diameter of the annular protrusion 41 is fitted to the inner periphery of the pipe insertion port 10, or the inner diameter of the annular protrusion 41 is fitted to the outer periphery of the cylindrical core portion 3. In this embodiment, the outer diameter of the annular outer peripheral surface 45 is fitted to the cylindrical inner peripheral surface 23 of the lid member 5 for the crosslinked polyethylene pipe, and the inner diameter of the annular inner peripheral surface 46 is the outer peripheral surface of the cylindrical core portion 3 for the polybutene pipe. 8 is formed to have a diameter that fits into 8.

The annular outer peripheral surface 45 and the annular inner peripheral surface 46 are connected by a semicircular arc portion 47 having a semicircular cross section, and the annular hollow groove 42 is formed by this structure. Further, an outer peripheral flange surface 43 is provided via the rounded portion 48 following the annular outer peripheral surface 45, and a concave surface 44 is provided via the rounded portion 49 following the annular inner peripheral surface 46.
With this configuration, the annular protrusion 41 can be elastically deformed in the centripetal direction to expand or contract the diameter.

  The outer ring flange surface 43 is formed in a bowl shape on the outer peripheral side of the annular protrusion 41. The outer diameter of the outer ring flange surface 43 is slightly larger than the mortar surface 21 of the joint body 1, and when the cap body 40 is attached to the joint body 1, the outer ring flange surface 43 serves as a pipe insertion port. 10 can be brought into contact with the outer end surface 20. In this case, it is preferable that the outer ring flange surface 43 has an outer diameter smaller than the outer diameter of the lid member 5, and the outer ring flange surface 43 is the outer periphery of the lid member 5 when the outer ring flange surface 43 abuts. It is desirable not to protrude outward from the surface. The outer ring flange surface 43 is kept in contact with the outer end surface 20 of the pipe insertion port via the rounded portion 48 even when the annular protrusion 41 is expanded or contracted.

  The concave surface 44 is formed on the inner side of the annular projecting portion 41, and the distal end side of the cylindrical core portion 3 can be accommodated inside the concave surface 44. The outer surface 44a of the recessed surface 44 is formed in a state in which the cap body 40 is slightly projected on the other side surface of the cap body 40 from the outer surface 43a of the outer ring flange surface 43 in a natural state before the cap body 40 is attached to the joint body 1. Has been.

When the cap body 40 is attached to the joint main body 1 and the distal end side of the cylindrical core portion 3 is accommodated in the concave surface 44, a slight gap 50 is formed between the concave surface 44 and the distal end side of the cylindrical core portion 3. . Further, when the outer ring flange surface 43 comes into contact with the outer end surface 20 of the pipe insertion port 10, a gap 51 is formed between the lid member 5 and the cap body 40. When the concave surface 44 of the cap body 40 is pressed in this state, the outer ring flange surface 43 of the cap body abuts on the mortar surface 21 while warping in a mortar shape.
Moreover, you may make it give the embossing to the fitting site | part to the coupling main body 1 of the cap body 40, ie, the surface side in the annular protrusion 41. FIG.

Subsequently, the case where the dustproof cap for joints of the said embodiment is attached or detached to the joint main body mentioned above is demonstrated.
In FIG. 4, when the cap body 40 is attached to the joint body 1, the annular protrusion 41 is fitted into the pipe insertion port 10 of the lid member 5 so as to be pushed. 4 and 5 show the joint body 1 for a cross-linked polyethylene pipe. In this case, in the annular protrusion 41, the outer diameter of the annular outer peripheral surface 45 is slightly larger than the inner diameter of the annular convex portion 24. The inner diameter of the annular inner peripheral surface 46 is slightly larger than the outer diameter on the distal end side of the cylindrical core portion 3. As a result, as shown in FIG. 4, a slight space 55 is generated between the annular inner peripheral surface 46 and the cylindrical core portion 3.

  Since the cap body 40 is formed with the above-described annular protrusion 41 composed of the annular hollow groove 42, the annular protrusion 41 is compressed to the inner diameter side by the annular protrusion 24 as shown by the arrow in FIG. It is inserted into the pipe insertion port 10 while being done. This fitting is brought into close contact by the elastic force of the annular protrusion described later. Further, when the cap body 40 is inserted, the outer ring flange surface 43 comes into contact with the outer end surface 20 of the joint body.

  Subsequently, since the outer surface 44a of the concave surface 44 is formed to protrude slightly from the outer surface 43a of the outer ring flange surface 43 to the other surface side of the cap body 40 in a natural state, the concave surface 44 is formed in FIG. When pressed, the annular projection 41 is pushed in, and the outer projection flange surface 43 comes into contact with the mortar surface 21 while being deformed into a mortar shape by the depression of the annular projection 41. At this time, the pressing force of the annular protrusion 41 by the annular protrusion 24 becomes stronger. With this deformation, a substantially V-shaped opening portion is formed between the edge portion of the outer ring flange surface 43 and the notch surface 22 of the lid member.

  On the other hand, FIG. 6 shows a joint body 1 for a polybutene pipe having a diameter larger than that of a crosslinked polyethylene pipe. In this case, in the annular protrusion 41, the inner diameter of the annular inner peripheral surface 46 is slightly smaller than the outer diameter on the distal end side of the cylindrical core portion 3, and the outer diameter of the annular outer peripheral surface 45 is that of the annular convex portion 24. The diameter is slightly smaller than the inner diameter. Thereby, a slight space 56 is formed between the annular outer peripheral surface 45 and the annular convex portion 24.

  When the cap body 40 common to the above is attached, as shown by the arrow in FIG. 6, the annular protrusion 41 is expanded to the outer diameter side by the distal end side of the cylindrical core portion 3, and the pipe insertion port 10. Fit inside. This fitting is also brought into close contact by the elastic force of the annular projection described later. Furthermore, when the cap body 40 is inserted, the outer ring flange surface 43 contacts the outer end surface 20 of the joint body.

As described above, since the annular protrusion 41 composed of the annular hollow groove 42 is provided in the cap body 40, an appropriate elastic force is applied to the annular protrusion 41 by the space formed by the annular hollow groove 42 without using the elongation characteristics of the material. The annular protrusion 41 is compressed to the inner diameter side or expanded to the outer diameter side by this elastic force, so that the cap body 40 can be fitted into the pipe insertion port 10. For this reason, using a common cap body 40 for joint bodies having the same nominal diameter and different diameters of the pipe insertion port 10, a variation in dimensions during vacuum forming is absorbed and a problem in dimensional accuracy occurs. It can be fitted with improved adhesion while solving. At this time, since the surface of the annular protrusion 41 is flat, the annular protrusion 41 is fitted to the lid member 5 or the cylindrical core part 3 without a gap, and the outer ring flange surface 43 is outside the joint body. Dustproofness is enhanced by contacting the end face 20.
In addition, by providing the concave surface 44 inside the annular protrusion 41, the fitting portion is increased in rigidity as compared with the case where the fitting portion is cylindrical, and the fitting is performed in a state where an appropriate elastic force is generated. Can do.

  The cap body 40 can be attached to the joint body 1 in a state in which the gap is closed and the adhesiveness is improved, so that high dust resistance can be exhibited, and the cap body 40 after the attachment can be surely prevented from being loosened or dropped off naturally. it can. Furthermore, the dimension at the time of vacuum forming can also be stabilized by providing the projection height of the annular projection 41 (not shown) in the axial center Q direction as low as a predetermined height.

  Since the ring-shaped protrusion 41 that is a fitting part of the cap body 40 to the joint body 1 is subjected to the texture processing, the adhesion to the joint body 1 can be further improved, and the mold release when the cap body 40 is vacuum-formed. Can also be improved. By making these wrinkles into an appropriate pattern, the decorativeness can be improved, or the resistance due to wrinkles can be increased to prevent the cap body 40 from falling off more reliably.

  When the cap body 40 is attached, the cap body 40 can be fitted while being centered along the mortar surface 21 only by inserting the cap body 40 from the inlet side of the pipe insertion port 10. For this reason, it is not necessary to align as in the case of using an adhesive seal member, and the cap body 40 can be easily mounted at a predetermined position.

Since the outer ring flange surface 43 is configured to be in contact with the end surface side of the lid member 5 to prevent dust, the cap body 40 after mounting the print information even when there is print information on the outer peripheral side of the lid member 5. There is no hindrance from the outside. For this reason, the decorativeness of the joint body 1 is not hindered.
The cap body 40 is formed of a translucent resin circular thin plate material, and the annular protrusion 41 after mounting is in a state of being close to the insertion guide 15, so that the indication color of the insertion guide 15 is transmitted from the outside. It can also be confirmed.

  4 and 6, when the cap body 40 is removed from the joint body 1, a claw or an opening is formed in the substantially V-shaped opening between the outer ring flange surface 43 and the notch surface 22 of the lid member. When the finger is inserted, the elastic force that the annular protrusion 41 tries to return to the original shape can be used. This elastic force is brought about by the material itself forming the cap body 40, the connecting portion between the annular outer peripheral surface 45 and the annular inner peripheral surface 46, specifically, the semicircular arc portion 47 having a semicircular cross section in the present embodiment. Because of this elastic force, the cap body 40 can be easily removed by one hand operation. At this time, the pipe insertion port 10 and the outside air communicate with each other, so that sound can be generated. In that case, it can be confirmed that the cap body 40 has been removed by checking the sound.

  When an operator joins the pipe P to the joint body 1 from which the cap body 40 has been removed, the colored insertion guide 15 and the pipe P are visually recognized through the cover member 5 and the outer cylinder 4 having transparency. The click sound can be confirmed by the elastic tongue piece 35 of the insertion guide 15, and the work of measuring the amount of insertion of the pipe P becomes unnecessary. By using the cap body 40 as dust-proof means in this way, there is no need for an adhesive seal member or pen for the marker, and there is no risk that the adhesive material or ink of the adhesive seal member will adversely affect the pipe P. At the same time, the sealing performance after the pipe P joining can be secured.

Next, another embodiment of the dust cap for a joint according to the present invention will be described. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In FIG. 7, the joint main body 60 in this embodiment includes a joint member 61, a see-through cylinder 62, a lid member 63, an annular spacer 64, a lock ring 6, and a seal member 65 including an O-ring. The cap body 40 described above is detachable.

  In this joint body 60, the see-through cylinder 62 is formed of a resin material having transparency, and the insertion state of the pipe P can be visually recognized from the outside. The annular spacer 64 is mounted between the see-through cylinder 62 to which the O-ring 65 for outer peripheral sealing is mounted and the lid member 63, and is provided for disposing the lock ring 6 in a state of being separated from the O-ring 65. Yes.

  The joint portion 61 and the lid member 63 are integrated in a state in which the see-through cylinder 62, the annular spacer 64, the lock ring 6, and the O-ring 65 are incorporated therein, thereby forming the joint body 60. The joint main body 60 has a so-called outer peripheral seal structure in which the pipe P is joined while the lock ring 6 prevents it from coming off, and the outer periphery of the pipe P is sealed by the O-ring 65.

  When the cap body 40 is attached to the joint main body 60, the annular protrusion 41 is fitted so as to be pushed in from the pipe insertion port 66 formed in the lid member 63 as in the above-described embodiment. At this time, the outer diameter of the annular outer peripheral surface 45 of the annular protrusion 41 is slightly larger than the inner diameter of the pipe insertion port 66, so that the annular protrusion 41 is compressed to the inner diameter side by the pipe insertion port 66. The pipe is inserted into the pipe insertion port 66. Further, when the cap body 40 is inserted, the outer ring flange surface 43 abuts on the outer end surface 67 of the joint body 60. In this manner, the cap body 40 can be attached to the joint body 60 while improving the adhesion due to the elastic force of the annular protrusion 41, thereby exhibiting high dust resistance. Moreover, the elastic force of the annular protrusion 41 prevents the cap body 40 from naturally loosening or dropping off.

  When the cap body 40 is removed from the joint body 60, a claw is formed in a substantially V-shaped opening between the outer ring flange surface 43 and the notch surface 68 formed in the lid member 63, as in the above embodiment. And can be easily removed by inserting a finger.

  Furthermore, the cap body 40 can be mounted in the joint body 60 in a state in which the cylindrical core portion 70 to be inserted into the pipe P is accommodated. The cylindrical core portion 70 in this embodiment has a cylindrical shape having a cylindrical portion 71 and a flange portion 72, and is provided separately from the joint body 60. The cylindrical core portion 70 is provided so as to be attachable to the pipe P. When the cylindrical core portion 70 is attached, the cylindrical portion 71 is inserted into the inner peripheral side of the pipe P, and the flange portion 72 is in contact with the cut end portion of the pipe P. .

When the cap body 40 is attached to the joint body 60, the cylindrical core portion 70 is placed inside the joint body 60 so that the flange 72 is on the opening side of the pipe insertion port 66, as shown by a two-dot chain line in FIG. And then inserting the outer ring flange surface 43 into the outer end portion of the cylindrical core portion 70 while inserting the annular protrusion 41 of the cap body 40 into the pipe insertion port 66 so as to be disposed at a position opposite to the flange portion 72. It is made to contact | abut to the outer end surface 67 of a coupling main body. At this time, since the outer diameter of the annular outer peripheral surface 45 is slightly larger than the inner diameter of the pipe insertion port 66, the annular protrusion 41 is compressed to the inner diameter side by the pipe insertion port 66 and exhibits high dust resistance. In addition, the cap body 40 can be fitted to the joint body 60 in a state in which loosening or dropping is prevented. This reliably prevents the cylindrical core portion 70 from falling off the pipe insertion port 66.
Furthermore, the present invention is not limited to the description of the above-described embodiment, and various modifications can be made without departing from the spirit of the invention described in the claims of the present invention.

DESCRIPTION OF SYMBOLS 1 Joint main body 9 Inner peripheral surface 3 Cylindrical core part 8 Outer peripheral surface 10 Pipe insertion port 20 Outer end surface 21 Conical surface 40 Cap body 41 Annular protrusion 42 Annular hollow groove 43 Outer ring flange surface 43a Outer surface 44 Recessed surface 44a Outer surface

Claims (7)

  A dust cap for a joint that prevents dust from being inserted into a pipe insertion port between the inner peripheral surface of the joint main body and the outer peripheral surface of the cylindrical core portion that is provided integrally or separately in the joint main body, and is formed on one side of a circular thin plate. A cap body is constituted by an annular protrusion formed of an annular hollow groove, an outer ring flange surface formed on the outer periphery of the annular protrusion, and a recessed surface formed on the inner side of the annular protrusion, and the annular protrusion is A dustproof cap for joints, which is fitted into a pipe insertion opening, and the outer ring flange surface is brought into contact with the outer end surface of the joint body.   The dustproof cap for a joint according to claim 1, wherein the outer surface of the concave surface is slightly protruded from the outer surface of the outer ring flange surface to the other side surface of the cap body.   A joint in which the outer end surface of the joint body is formed with a mortar surface, and when the concave surface of the cap body is pressed, the outer ring flange surface of the cap body is brought into contact with the mortar surface in a warped shape. The dustproof cap for joints according to claim 1 or 2.   A joint for joining pipes having different inner and outer diameters, wherein the outer diameter of the annular protrusion is fitted to the inner periphery of the pipe insertion port, or the inner diameter of the annular protrusion is fitted to the outer periphery of the cylindrical core part. The dustproof cap for a joint according to any one of claims 1 to 3, wherein the cap is worn.   A cap body is constituted by an annular protrusion formed of an annular hollow groove formed on one side of a circular thin plate, an outer ring flange surface formed on the outer periphery of the annular protrusion, and a recessed surface formed on the inner side of the annular protrusion. And the said annular projection part is fitted in the pipe insertion port of a coupling main body, The said outer ring flange surface is made to contact | abut to the outer end surface of a coupling main body, The dustproof cap for couplings characterized by the above-mentioned.   A joint in which a cylindrical core portion to be inserted into a pipe is accommodated in a joint body, and the annular protrusion is fitted in the cylindrical core portion in a state where the cylindrical core portion is accommodated in the joint body, The dust cap for a joint according to claim 5, wherein the ring flange surface is in contact with the outer end surface of the cylindrical core portion and the outer end surface of the joint body.   The dust cap for a joint according to any one of claims 1 to 6, wherein the cap body is a resin-made thin circular plate manufactured by vacuum forming.

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