JP2005090704A - Water faucet joint with fusion saddle - Google Patents

Abstract

In a water faucet joint with a fusion saddle in which a metal adapter having a female screw is embedded in a water faucet connection port, a thick portion at the rising end of the water faucet connection port is eliminated to eliminate a hole in the thick wall portion. A water faucet joint with a fusion saddle that does not occur is provided.
A water faucet joint with a fusion saddle, wherein a saddle made of polyolefin resin having a water faucet connection port in which a metal adapter having a female screw is embedded, is formed by screwing the water faucet onto the metal adapter. The end surface of the metal adapter facing the saddle is a curved surface or a plane substantially along the saddle inner surface.
[Selection] Figure 1

Description

  The present invention relates to a water faucet joint with a fused saddle, and in particular, the saddle is formed of a polyolefin resin, and a metal adapter having an internal thread is embedded in the water faucet connection port of the saddle. The present invention relates to a water faucet joint with a fusion saddle that is screwed together.

  Conventionally, polyolefin resin pipes have been used as piping materials for gas, water, sewage and the like that are resistant to bending and impact and are not damaged even by ground fluctuation caused by an earthquake. In this polyolefin resin pipe piping line, when performing continuous water branch piping, a saddle with a continuous water branch joint is fused to the polyolefin resin pipe, and the branch pipe is piped to the continuous water branch joint and then inserted. By rotating the perforating jig to perforate the polyolefin resin pipe, branch piping can be performed without stopping the flow state of the fluid flowing through the piping line of the polyolefin resin pipe.

  As such a faucet with a fused saddle, a saddle fused to a polyolefin tube and made of a polyolefin resin, connected to a faucet connection port and a faucet connection port formed in the saddle, and In a water faucet with a fused saddle including a water faucet made of metal, by embedding a metal adapter having a female thread in the water faucet connection port, and by screwing a male screw formed in the water faucet into the female thread There has been proposed a water faucet with a fused saddle in which the saddle and the water faucet are integrated (see, for example, Patent Document 1 (Claims, etc.)).

JP 2000-179777 A (see claims, paragraph numbers 0006 to 001, FIGS. 1 to 4).

  According to the proposal of Patent Document 1, since the metal adapter is embedded in the water faucet connection port of the saddle, the water faucet connection port and the metal adapter are firmly joined. For example, when a concave portion is provided on the outer surface of the metal adapter and a saddle is formed by pouring a synthetic resin material into the concave portion, the water faucet connection port and the metal adapter are firmly integrated. Therefore, after the male screw of the water faucet is screwed into the female screw of the metal adapter, the water faucet is not detached or rotated with respect to the saddle (see Patent Document 1, paragraph 0007).

Therefore, according to this proposal, even if the drilling jig inserted into the water faucet is rotated, there is no concern that the water faucet will rotate. It is possible to omit the work of rearranging the direction of the water faucet later. Therefore, workability can be dramatically improved (see Patent Document 1, paragraph 0008).
Moreover, even if the length of the joint between the saddle and the water faucet is shortened, the saddle and the water faucet can be firmly joined. Therefore, a drilling jig for a water faucet with a cast iron saddle commonly used is used. Can be used as they are, and there is no need to prepare a dedicated drilling jig. Therefore, the cost can be reduced as a whole (see Patent Document 1, paragraph 0009).
Furthermore, since the male screw of the water faucet and the female screw of the metal adapter are both made of metal, there is no concern that the water faucet or saddle will be damaged at the joint even if they are tightened together. Therefore, it is possible to prevent water leakage due to breakage of the joint (see Patent Document 1, paragraph 0010).
It has been described in Patent Document 1 that it has such effects.

In the water faucet with a fused saddle described in Patent Document 1, a metal adapter having a female thread is embedded in the water faucet connection port of the saddle, and a recess is provided on the outer surface of the metal adapter. Since the saddle is formed by pouring the resin material, the water faucet connection port and the metal adapter are firmly joined.
However, as shown in FIGS. 3 and 4 of Patent Document 1, the metal adapter 32 is an annular ring having the same height and having a flat bottom surface. Therefore, when the saddle 16 is formed by pouring a synthetic resin material so that the metal adapter 32 is embedded in the water faucet connection port 30 of the saddle 16, the saddle 16 is formed in an arc shape so as to be covered with the polyolefin resin pipe 12. Therefore, the lower surface of the metal adapter 32 is located, and the portion where the water faucet connection port 30 rises from the saddle 16 becomes a thick portion. That is, at a position that intersects the tube axis of the pipe 12 of the water faucet connection port 30, that is, at a position where the water faucet connection port 30 rises from the saddle 16 in FIG. A thick part is inevitably produced.

When the saddle 16 is injection-molded by pouring a synthetic resin material so as to embed the metal adapter 32, vacuum bubbles are often formed at several locations in the circumferential direction inside the thick portion. In the saddle 16, a vacuum bubble is formed at the rising portion of the water faucet connection port 30 between the lower surface of the metal adapter 32 and the saddle 16, and the portion where the vacuum bubble is formed is partially A portion where the thickness of the water faucet connection port 30 is thin is generated.
The cause of the generation of vacuum bubbles in the thick part during molding is that the polyolefin resin has a large thermal shrinkage compared to the heat shrinkage rate of the metal adapter 32, so that the polyolefin resin is pulled during cooling (so-called sink marks are generated). It is considered that a cavity is generated in the central part of the thick part that is cooled most slowly.

  When the inventors of the present invention conducted a trial production and a construction experiment, vacuum bubbles often occurred inside the resin molded product, and branch piping was performed using a water faucet with a fused saddle using such a saddle. If an external force is applied at the time of construction or after the completion of piping construction, stress concentrates on this vacuum bubble, which may cause damage due to the reduced thickness. It became clear that there was a problem.

  According to the present invention, in a water faucet joint with a fusion saddle in which a metal adapter having a female screw is embedded in the water faucet connection port, a vacuum bubble is generated by eliminating the thick part of the rising portion of the water faucet connection port. An object of the present invention is to provide a water faucet joint with a fusion saddle that does not have any.

  A water faucet joint with a fusion saddle according to claim 1 of the present invention is a saddle made of polyolefin resin having a water faucet connection port in which a metal adapter having a female thread is embedded. In the water faucet joint with a fusion saddle formed by screwing, the end surface of the metal adapter facing the saddle is a curved surface or a plane substantially along the inner surface of the saddle.

  Further, according to a second aspect of the present invention, there is provided a water faucet joint with a fusion saddle according to the present invention, wherein the metal adapter of the saddle made of a polyolefin resin having a water faucet connection port in which a metal adapter having a female thread is embedded, In a water faucet joint with a fused saddle screwed with a water faucet, recesses are formed along the outer surface of the saddle on both side outer surfaces in a direction intersecting the axial direction of the saddle of the water faucet connection port. It is characterized by being.

  The water faucet joint with a fusion saddle according to claim 3 of the present invention is the water faucet joint with a fusion saddle according to claim 2, wherein the recessed portions are formed around the outer surfaces of both side portions of the water faucet connection port. A plurality are formed at intervals in the direction.

2. A water faucet joint with a fusion saddle according to claim 1, wherein the end surface of the metal adapter facing the saddle is a curved surface or a plane substantially along the inner surface of the saddle. Then, the portion where the thick portion occurs is filled with the portion extended along the inner surface of the saddle on the lower surface side of the metal adapter, and as a result, the thick portion does not occur.
Therefore, even when a synthetic resin material is poured to embed a metal adapter and a saddle is molded, a product having no defects such as vacuum bubbles can be obtained, and a water faucet joint with a fused saddle having no problem in strength can be obtained.

  Further, in the water faucet joint with a fusion saddle according to claim 2, concave portions are formed along the saddle outer surface on both side outer surfaces in the direction intersecting the axial direction of the saddle of the water faucet connection port. Therefore, the water faucet with the fused saddle where the thick-walled portion has been reduced due to the recessed portion and the cooling bubble is no longer delayed, so that no vacuum bubbles are formed. It is thought that a joint can be obtained.

  The water faucet joint with fusion saddle according to claim 3 is the water faucet joint with fusion saddle according to claim 2, wherein the recessed portions are spaced circumferentially on the outer surfaces of both side portions of the water faucet connection port. Therefore, a water faucet joint with a fusion saddle without a vacuum bubble formed therein can be obtained without causing a decrease in strength.

  In order to describe the present invention in more detail, examples are given below, but the present invention is not limited to these examples.

FIG. 1 shows a first embodiment of a water faucet joint with a fusion saddle according to the present invention, which corresponds to the first embodiment. (A) is a partly omitted front view showing a part in cross section, (B) is a side view showing a part omitted in section.
FIG. 2 shows a metal adapter used in the first embodiment shown in FIG. 1, wherein (A) is a front view showing a part in cross section, and (B) is a side view showing a part in cross section.

1 and 2, 1 is a saddle, 11 is a water faucet connection port rising from the saddle 1, 2 is a metal adapter embedded in the water faucet connection port 11, and 3 is a water faucet joint.
Since the inner surface of the saddle 1 is coated and fused to the outer peripheral surface of the polyolefin resin pipe 4 that is branched, a concave curved surface having a radius equal to the radius of the polyolefin resin pipe 4 is formed. The fusion resistance wire 12 is disposed in a spiral shape on the inner surface around the opening.

The overall shape of the metal adapter 2 is shown in FIG. A female screw 21 is engraved on the outer surface of the inner surface, and a ring-shaped protrusion 22 is formed on the outer peripheral surface.
An end surface 23 of the metal adapter 2 facing the saddle 1 is a curved surface or a plane that is substantially along the inner surface of the saddle 1. Since the inner surface of the saddle 1 is a concave curved surface coinciding with the outer surface of the polyolefin-based resin tube 4, the end surface 23 on the side facing the saddle 1 of the metal adapter 2 is also shown in FIG. ) In the front view, both sides hang down. The end surface 23 does not need to be exactly along the inner surface of the saddle 1, and may be a curved surface or a refracted plane that is substantially along.

When the saddle 1 is molded from a polyolefin-based resin, the metal adapter 2 is embedded in the water faucet connection port 11 of the saddle 1 by insert injection molding. Since the ring-shaped protrusion 22 is formed on the outer peripheral surface of the metal adapter 2, the protrusion 22 is embedded in the water faucet connection port 11 and is firmly integrated.
In addition, since the end surface 23 of the metal adapter 2 is disposed and embedded along the inner surface of the saddle 1, the part that hangs down on both sides of the end surface 23 rises from the saddle 1. The resin is arranged in a thick portion so that the resin does not become thick.
Therefore, conventionally, a vacuum bubble that becomes a thick part and becomes a strength defect has been formed inside, but in the water faucet joint with a fusion saddle of the present invention, No vacuum bubbles are formed, and there is no problem of strength.

  The water faucet joint 3 is provided with a male screw 31 that is screwed into the female screw 21 of the metal adapter 2, and is attached to the saddle 1 by screwing the male screw 31 into the female screw 21 of the metal adapter 2. 32 is an O-ring provided at the end of the male screw 21, and is a water stop packing between the water faucet joint 3 and the metal adapter 2.

In order to make a branch pipe from the polyolefin resin pipe 4 using the water faucet joint with a fusion saddle formed in this way, the surface layer of the outer surface portion where the saddle 1 of the polyolefin resin pipe 4 is fused is scraped, Apply saddle 1 here. After fastening both ends of the saddle 1 to the polyolefin resin tube 4 with fasteners, the terminals 13 and 13 of the saddle 1 are energized to heat the fusion resistance wire 12, and the outer surface of the polyolefin resin tube 4 and the inner surface of the saddle 1 Is melted and fused.
After the saddle 1 is fused, a branch pipe is connected to the water faucet joint (non-permanent water faucet joint) 3 and then a perforated blade is inserted into the water faucet joint (non-permanent water faucet joint) 3 to rotate. Then, the connecting portion with the polyolefin resin pipe 4 is perforated so that the flow of the fluid in the polyolefin resin pipe 4 is not stopped, and the branch pipe is connected from the polyolefin resin pipe 4 through the water faucet joint with the fusion saddle. The fluid can be caused to flow.

  FIG. 3 shows a second embodiment of a water faucet joint with a fusion saddle according to the present invention, which corresponds to claims 2 and 3. (A) is a partly omitted front view showing a part in cross section, (B) is a side view showing a part omitted in section. FIG. 4 and FIG. 5 are side views in which a part of another example corresponding to the second aspect is omitted and a part thereof is shown in cross section.

Based on FIG. 3, differences from the first embodiment shown in FIGS. 1 and 2 will be described.
In the second embodiment, an annular ring having the same height and having an internal thread 21a on the inner surface is used as in the case where the metal adapter 2a is conventionally used. Thick portions S are formed between the metal adapter 2a and the bottom surface of the metal adapter 2a at both side portions in the axial direction of the saddle 1a of the rising portion from the saddle 1a of the water faucet connection port 11a rising from the saddle 1a.

Therefore, in the second embodiment, a recessed portion 14a is formed on the outer surface of the thick portion S along the outer surface of the water faucet connection port 11a.
The recesses 14a need only have a width, depth, and number that can eliminate the thick-walled portion S and have a shape that does not cause a problem in strength. For example, the area where the recessed portion 14a is provided may be about half the area where the thick portion S is generated, and the depth may be about half the thickness of the thick portion 14a. If five concave portions 14a shown in FIG. 3 are of a size and depth corresponding to the width of the thick portion 14a on one side, there will be little decrease in strength and no vacuum bubbles will be formed. This is a preferred example.

  The recess 14a is preferably a recess having a round shape so that an acute corner is not formed in a planar or depth direction. By using such a recessed portion 14a, even if an external force is applied, sufficient strength can be maintained if there is no stress concentration. Thus, although the apparent thickness is reduced by the recessed portions, the columns between the recessed portions serve as reinforcing ribs.

  In addition, as shown in FIG. 4 (A), the recessed portion 14a may be two on one side along the outer surface of the water faucet connection port, and as shown in FIG. 4 (B), the water faucet A plurality of steps may be formed along the outer surface of the connection port.

  In the above embodiment, an example of a saddle provided with a resistance heating wire for electric fusion was shown. However, in the present invention, a fusion saddle that is fused by bringing it into contact with a hot plate to melt an adhesive surface. It may be attached.

The 1st Example of the water faucet joint with a fusion saddle of this invention is shown, (A) abbreviate | omits one part, the front view which shows one part in a cross section, (B) abbreviate | omits one part, and one part FIG. The metal adapter currently used by Example 1 shown in Drawing 1 is shown, (A) is a front view showing a part in section, and (B) is a side view showing a part in a section. The 2nd Example of the water faucet joint with a fusion saddle of this invention is shown, (A) abbreviate | omits one part, the front view which shows one part in a cross section, (B) a part abbreviate | omits, one part FIG. It is a side view which abbreviate | omits a part of other examples in 2nd Example, and shows a part in cross section. It is a side view which abbreviate | omits a part of other examples in 2nd Example, and shows a part in cross section.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a Saddle 11, 11a Water faucet connection port 14a Recessed part 2, 2a Metal adapter 21, 21a Female screw 23 End surface of the metal adapter facing the saddle 3 Water faucet joint 31 Male screw 4 Polyolefin resin pipe S Thick wall Part

Claims (3)

  In a saddle joint made of polyolefin resin having a water faucet connection port in which a metal adapter having a female thread is embedded, and in a water faucet joint with a fusion saddle in which a water faucet is screwed to the metal adapter, A water faucet joint with a fused saddle, characterized in that the end surface facing the saddle is a curved surface or a plane substantially along the inner surface of the saddle.   In a water spigot joint with a fusion saddle in which a water faucet is screwed into this metal adapter, a water faucet of a saddle made of polyolefin resin having a water faucet connection port in which a metal adapter having a female screw is embedded A water faucet joint with a fusion saddle, wherein concave portions are formed along outer surfaces of both side portions in the direction intersecting the axial direction of the saddle of the connection port.   The water faucet joint with a fusion saddle according to claim 2, wherein a plurality of recessed portions are formed at intervals in the circumferential direction of the water faucet connection port.

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