JP7514176B2 - Wall Mounting Joint - Google Patents

Description

This invention relates to a wall-mounted joint with a female thread.

As a joint for connecting metal piping and resin piping, a joint body has been proposed in which the body is made of synthetic resin and the female threaded portion into which the metal piping is screwed is formed by a metal insert (see, for example, Patent Document 1).

Japanese Utility Model Application Publication No. 5-49325

However, the joint in Patent Document 1 is susceptible to water leakage from the boundary between the joint body and the metal insert, so measures to prevent water leakage, such as placing a sealant on the outer periphery of the metal insert, are necessary.

The present invention has been proposed in consideration of the above problems associated with the conventional technology, and aims to provide a wall-mounted joint that is free from the risk of water leakage.

In order to overcome the above problems and achieve the intended purpose, the wall mounting joint of the present invention comprises:
A joint body having a female thread portion, the entire flow passage including the female thread portion being formed of a synthetic resin;
The gist of the invention is that it comprises a reinforcing body made of metal, which has an attachment portion that covers the entire periphery of the female threaded portion from the tip and has a male thread on its outer periphery, and a flange portion that is integrally formed at the base of the attachment portion.

The wall mounting joint of the present invention eliminates the risk of water leakage between different materials.

FIG. 2 is a side view showing a wall mounting joint according to an embodiment of the present invention. 1A shows the wall-mounted joint of the embodiment before it is attached to the wall, and FIG. 1B shows the wall-mounted joint of the embodiment after it has been attached to the wall. FIG. 2 is a cross-sectional view of a wall mounting joint according to an embodiment. 2 is a cross-sectional view taken along line AA in FIG. 1. 2 is a cross-sectional view of a modified wall-mounted joint taken along line AA of FIG. 1.

Next, a preferred embodiment of the wall mounting joint according to the present invention will be described below with reference to the attached drawings.

As shown in Fig. 1 and Fig. 3, the wall-mounted joint (hereinafter simply referred to as the joint) 10 comprises a joint body 12 made of synthetic resin and a metal reinforcing body 14 integrally provided with the joint body 12. The joint 10 in the embodiment is a so-called elbow in which the opening direction of one connection part differs by 90° from the opening direction of the other connection part. As shown in Fig. 2, the joint 10 is attached to a wall W of a bathroom or the like in a water supply (hot water) pipe, and a faucet or metal piping is connected to one connection part facing the indoor ID from the wall W, and an external piping such as a resin piping or an aluminum three-layer pipe standing up along the wall W is connected to the other connection part facing the outdoor OD. The joint 10 in the embodiment is an insert molded product obtained by molding the joint body 12 by injection molding or the like in a mold in which the reinforcing body 14 is set.

As shown in FIG. 3, the fitting body 12 is formed in a cylindrical shape with a flow passage 10a for water or the like formed inside. The fitting body 12 has a female threaded portion 16 as one connecting portion, and a connecting portion 18 as the other connecting portion. The female threaded portion 16 has a female thread 16a formed on the inside of the cylindrical shape to mesh with a male threaded portion of a water faucet or the like. The female threaded portion 16 has a tapered portion 16b formed on the inside of the tip end thereof where the female thread 16a is not formed. The connecting portion 18 in the embodiment is a plug type that is inserted inside the external pipe to connect to the external pipe. The outer periphery of the connecting portion 18 has multiple protrusions 18a that prevent the external pipe from coming loose.

Examples of the synthetic resin that can be used to form the joint body 12 include PPS (polyphenylene sulfide) resin, polyethylene resin, cross-linked polyethylene resin, polybutene resin, and polyvinyl chloride resin. Among these, it is preferable to use PPS resin, which has excellent heat resistance, chemical resistance, dimensional stability, and rigidity, and it is more preferable to use PPS resin blended with elastomer. PPS resin may be blended with elastomer alone, but it may also contain reinforcing materials such as glass fiber and filler in addition to elastomer. In particular, PPS resin blended with elastomer has excellent toughness and strength, so it can prevent the female threaded portion 16 from cracking when the male threaded portion of a faucet or the like is screwed in. In addition, the female threaded portion 16 and the male threaded portion fit well together, and the water-stopping properties between the female threaded portion 16 and the male threaded portion can be improved.

As shown in Figs. 1 to 3, the reinforcing body 14 has an attachment portion 20 arranged to cover the periphery of the female thread portion 16, and a flange portion 22 integrally formed at the base of the attachment portion 20. The attachment portion 20 is provided so as to cover the periphery of the female thread portion 16 from the tip to the base of the female thread portion 16. The attachment portion 20 not only covers the entire outside of the female thread 16a, but also covers the outside of the tapered portion 16b provided on the insertion port side of the female thread 16a. A male thread 20a is provided on the outer periphery of the attachment portion 20. The attachment portion 20 and the male thread 20a are set to an appropriate length depending on the thickness of the wall W, and the male thread 20a in the embodiment is formed from the tip to the base of the cylindrical attachment portion 20. The flange portion 22 is a plate-like portion provided to protrude in all directions from the attachment portion 20, and is formed in a circular shape in the embodiment. The reinforcing member 14 can be made of a metal material such as gunmetal, bronze, copper, iron, or stainless steel, and has greater strength than the female threaded portion 16.

As shown in FIG. 3, the joint 10 includes a retaining protrusion 24 provided on the joint body 12, and a retaining recess 26 provided on the inside of the flange portion 22 of the reinforcement body 14 and hooked onto the retaining protrusion 24. The retaining protrusion 24 is provided at the base of the female threaded portion 16 and is formed in a convex shape that protrudes around the entire circumference of the female threaded portion 16. The retaining recess 26 is formed in a concave shape around the entire inner circumference of the circular flange portion 22. The retaining protrusion 24 and the retaining recess 26 hook onto the male threaded portion of the faucet or the like in the insertion/removal direction of the female threaded portion 16, positioning the reinforcement body 14 so that it does not move in the insertion/removal direction relative to the joint body 12.

3 and 4, the joint 10 has a rotation-stop recess 28 provided on the outside of the joint body 12 and a rotation-stop protrusion 30 provided on the inside of the reinforcement body 14 and hooked onto the rotation-stop recess 28. The rotation-stop recess 28 is provided at the base of the female threaded portion 16 and is formed in a concave shape recessed from the outer circumferential surface of the female threaded portion 16. In the embodiment, a plurality of (four) rotation-stop recesses 28 are provided at intervals on the outer periphery of the female threaded portion 16 (see FIG. 4). In addition, the rotation-stop recess 28 in the embodiment is disposed on the side farther from the insertion port of the female threaded portion 16 than the slip-out prevention protrusion 24. The rotation-stop protrusion 30 is formed in a convex shape protruding inward. In the embodiment, a plurality of (four) rotation-stop protrusions 30 are provided at intervals on the inner periphery of the reinforcement body 14, and the rotation-stop recesses 28 correspond to the rotation-stop protrusions 30 (see FIG. 4). The anti-rotation protrusion 30 in the embodiment is disposed on the opposite side of the male thread 20a across the flange portion 22. The anti-rotation recess 28 and the anti-rotation protrusion 30 are caught in the direction of rotation when the male thread of the faucet or the like is screwed into the female thread portion 16 and in the direction of rotation when the male thread is removed from the female thread portion 16, positioning the reinforcing body 14 so that it does not rotate in the circumferential direction relative to the joint body 12.

As shown in Figure 2(a), the fitting 10 can be easily attached to the wall W by passing the mounting portion 20 (female threaded portion 16) through a hole H drilled in the wall W from the outside OD, and then fitting a nut N onto the male thread 20a through a packing P from the inside ID. At this time, the fitting 10 can be positioned by abutting the flange portion 22 against the outer surface of the wall W, and the female threaded portion 16 can be properly faced toward the inside ID (see Figure 2(b)). The male threaded portion of a faucet or the like is then screwed into the female threaded portion 16 to attach the faucet or the like. Since the female threaded portion 16 of the fitting body 12 of the fitting 10 is surrounded and reinforced by the reinforcing body 14, damage to the female threaded portion 16 caused by screwing a faucet or the like into the female threaded portion 16 can be prevented. In addition, because the mounting portion 20 and the flange portion 22 of the joint 10 are made of a single piece of metal, the joint 10 can withstand the load of a water faucet or the like, improving its load-bearing capacity.

In the joint 10, the reinforcing body 14 is placed on the outside of the female threaded portion 16, and the flow passage 10a formed only by the joint body 12 is seamlessly constructed from synthetic resin. Therefore, in the joint 10, the joint portion between the reinforcing body 14 and the joint body 12 does not contact the flow passage 10a, so water does not leak from the flow passage 10a to the outside. In this way, since there is no risk of water leakage, there is no need to perform a water leakage test for every unit as in the conventional structure, and the effort and cost required for manufacturing can be reduced. In addition, if the joint body 12 of the joint 10 is molded using a mold in which the reinforcing body 14 is set, the effort and cost required for manufacturing can be reduced.

In the joint 10, the retaining protrusion 24 of the joint body 12 and the retaining recess 26 of the reinforcement body 14 are caught in the insertion and removal direction of the faucet, etc., relative to the female threaded portion 16. This prevents the joint body 12 and the reinforcement body 14 from shifting positions when the faucet, etc., is screwed into the female threaded portion 16 or when the faucet, etc., is removed from the female threaded portion 16, making it easier to install and remove the faucet, etc. Here, since the retaining recess 26 is provided at a position corresponding to the flange portion 22 of the reinforcement body 14, the strength of the reinforcement body 14 can be maintained even if a concave retaining recess 26 is formed in the reinforcement body 14. In addition, since the engagement between the retaining protrusion 24 and the retaining recess 26 is surrounded by the flange portion 22, the engagement between the retaining protrusion 24 and the retaining recess 26 can be maintained.

The joint 10 has a rotation-preventing recess 28 on the joint body 12 and a rotation-preventing protrusion 30 on the reinforcing member 14 that catch in the rotation direction of the faucet or the like being screwed into the female threaded portion 16 and in the rotation direction of the faucet or the like being removed from the female threaded portion 16. This prevents the joint body 12 from separating from the reinforcing member 14 and rotating together with the faucet or the like when the faucet or the like is attached or removed from the female threaded portion 16. Therefore, the joint 10 makes it easy to attach and remove the faucet or the like.

(Example of change)
The configuration is not limited to the above, and may be, for example, as follows.

(1) In the embodiment, the hooking between the anti-rotation recess 28 and the anti-rotation protrusion 30 is set to be the same in the removal rotation direction and the screw-in rotation direction, but this is not limited to the above, and the hooking between the anti-rotation recess 28 and the anti-rotation protrusion 30 may be configured to be smaller in the screw-in rotation direction than in the removal rotation direction. As shown in FIG. 5, in the modified joint 40, the walls of the anti-rotation recess 28 and the anti-rotation protrusion 30 in the screw-in rotation direction are inclined with respect to the screw-in rotation direction. In addition, the walls of the anti-rotation recess 28 and the anti-rotation protrusion 30 in the removal rotation direction are surfaces perpendicular to the screw-in rotation direction. This makes the hooking between the anti-rotation recess 28 and the anti-rotation protrusion 30 smaller in the screw-in rotation direction than in the removal rotation direction. By doing this, if a faucet or the like is screwed excessively into the female thread portion 16, the hooking between the anti-rotation recess 28 and the anti-rotation protrusion 30 will come off, indicating that there is an abnormality. On the other hand, when removing the faucet or the like from the female thread portion 16, the anti-rotation recess 28 and the anti-rotation protrusion 30 are kept engaged, so the faucet or the like can be removed. The engagement can also be adjusted by increasing or decreasing the engagement between the anti-rotation recess 28 and the anti-rotation protrusion 30.

(2) The connecting portion in the embodiment is a plug type, but is not limited to this and may be of other shapes, such as a socket type into which an external pipe is inserted.
(3) The outer shape of the flange portion is not limited to a circle, but may be a polygon such as a rectangle or a hexagon.
(4) The joint can be obtained in various ways, such as by insert molding, in which the joint body is molded in a mold in which the reinforcing body is set, or by combining a reinforcing body obtained by casting molding or the like with a joint body obtained by injection molding or the like.

10a Flow passage, 12 Joint body, 14 Reinforcement body, 16 Female thread portion, 20 Mounting portion,
20a Male thread, 22 Flange portion, 24 Anti-slip protrusion, 26 Anti-slip recess,
28 Anti-rotation recess, 30 Anti-rotation protrusion

Claims (5)

A joint body having a female thread portion, the entire flow passage including the female thread portion being formed of a synthetic resin;
A reinforcing body made of metal, the reinforcing body having an attachment portion that covers the entire periphery of the female thread portion from the tip and has a male thread on its outer periphery and a flange portion that is integrally formed at the base of the attachment portion ,
The joint body is provided with a retaining protrusion that is hooked in the insertion/removal direction of the female threaded portion in a retaining recess provided on the inside of the flange portion.
A wall mounting joint characterized by: A joint body having a female thread portion, the entire flow passage including the female thread portion being formed of a synthetic resin;
A reinforcing body made of metal, the reinforcing body having an attachment portion that covers the entire periphery of the female thread portion from the tip and has a male thread on its outer periphery and a flange portion that is integrally formed at the base of the attachment portion,
A rotation prevention recess provided on the outer side of the joint body;
The reinforcing member further includes a rotation-preventing protrusion that is provided on the inside of the reinforcing member and that engages with the rotation-preventing recess in a direction of rotation for screwing into the female threaded portion and a direction of rotation for removal from the female threaded portion.
A wall mounting joint characterized by : 3. The wall-mounting joint according to claim 2 , wherein a portion of said anti-rotation projection is exposed to the outside . 4. The wall-mounting joint according to claim 2 , wherein the engagement between the anti-rotation recess and the anti-rotation projection is smaller in the screw-in rotation direction than in the removal rotation direction. A joint body having a female thread portion, the entire flow passage including the female thread portion being formed of a synthetic resin;
A wall mounting joint characterized in that it comprises only a reinforcing body made of metal, an attachment portion that covers only the periphery of the female threaded portion from the tip to the entirety and has a male thread on its outer periphery, and a flange portion that is integrally formed at the base of the attachment portion .

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