JP3025177U - U-shaped tube - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a U-shaped pipe that can be efficiently produced. SOLUTION: Both ends are open, and one end (11) side is approximately 90.
A first member (10) integrally formed of a synthetic resin having a bent annular cross section, and a synthetic resin having an annular cross section in which both ends are open and one end (21) side is bent approximately 90 ° A second member (20), one end (11) of the first member (10) and one end (21) of the second member (20) are connected to each other to connect the first member (10) to the first member (10). The U-tube (100) is formed by connecting the two members (20).

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a U-shaped tube, and more particularly to a U-shaped tube made of synthetic resin.

[0002]

[Prior art]

 In the sewer pipe, in order to prevent the flow of odors from the downstream side, two U-shaped pipes are connected to form a odor control part called a trap in which water is always collected. When the sewer pipe is made of synthetic resin such as vinyl chloride, the U-shaped pipe that constitutes the trap is also made of synthetic resin.

[0003]

[Problems to be solved by the device]

 When integrally molding this type of U-shaped tube with synthetic resin, place a U-shaped core (core), which is a bent cylinder into a U-shape, in the mold, close the mold, and After injecting resin into the space between the cores and hardening the resin, the mold was opened and the resulting U-shaped tube was taken out of the mold, and then the U-shaped core was removed from the U-shaped tube. . However, since the core does not have flexibility, it was not easy to take out the U-shaped core from the molded U-shaped tube. Therefore, when the U-shaped tube is made of synthetic resin, it is necessary to make various improvements to the core, which hinders the efficient production of the U-shaped tube. The present invention has been made in view of the above problems, and an object thereof is to provide a U-shaped tube that can be efficiently produced.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a first invention of the present application is that a first member integrally formed of a synthetic resin having an annular cross section with both ends open and one end bent at about 90 °, and both ends open. A second member integrally formed of a synthetic resin having an annular cross section whose one end side is bent approximately 90 °, and one end of the first member and one end of the second member are connected to each other, and the first member and the first member. The two members are connected to form a U-shaped tube. In this invention, since the first member and the second member that are easy to manufacture because they are curved only about 90 ° form a U-shaped pipe, the U-shaped pipe can be manufactured efficiently. You can Explaining this in detail, the first member and the second member each use a core that can be divided into at least two at a position corresponding to approximately the center of the curved portion of each member, and It is integrally molded. To take out the core after molding, divide the core, one of the divided cores is opened from the opening on one end side of the first member or the second member, and the other of the divided cores is the other end side of the first member or the second member. This can be easily done by taking them out from the openings. Therefore, the forming operation of the first member and the second member is extremely easy, and the U-shaped pipe of the present invention constructed by connecting the first member and the second member is extremely efficiently manufactured. Be seen.

In the second invention of the present application, an annular groove extending in the circumferential direction is formed on one end side end surface of the first member, and the one end side end surface of the second member can be fitted into the annular groove. An annular protrusion having different dimensions is formed, and the annular protrusion is fitted into the annular groove to connect the first member and the second member. By adopting this configuration, the connection between the first member and the second member can be strengthened, and further, the relative positioning of both members when connecting the first member and the second member becomes easy. . Further, in the third invention of the present application, with the metal ring housed in the annular groove, the annular protrusion is fitted in the annular groove and a high frequency is applied from the outside to heat the metal ring to heat the annular groove and the annular protrusion. The first member and the second member are connected to each other by welding the parts. By adopting this configuration, the first member and the second member can be reliably and firmly connected.

[0006]

[Embodiment of device]

 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a U-shaped tube 100 according to an embodiment of the present invention includes a first member 10 and a second member 20 which are separately formed. Both the first member 10 and the second member 20 are J-shaped tubular bodies having an annular cross-section, both ends of which are open and one end side portion thereof is bent by approximately 90 °. The first member 10 and the second member 20 are integrally molded by a known method such as injection molding using a synthetic resin such as vinyl chloride or polypropylene. As is apparent from FIG. 3, which is a vertical cross-sectional view of the state in which the first member 10 and the second member 20 are joined at their one end portions 11 and 21 (joint end portions), respectively, the first member 10 and the second member 2 are shown. Both 0 have an internal space curved by approximately 90 °. When molding the first member 10 and the second member 20, a core that can be divided into at least two parts is used together with the mold at a position corresponding to approximately the center of the curved portion of each member 10, 20. It The core is taken out after molding the members 10 and 20 in the mold. The core is divided, and one of the divided cores is divided from the openings of the ends 11 and 21 of the first member or the second member. The other can be easily carried out by taking out the other from the openings 14 and 25 on the other end side of the first member or the second member. Therefore, the forming operation of the first member 10 and the second member 20 described above is extremely easy.

One end portion of the first portion 10, that is, the coupling end portion 11 is a thick flange-shaped portion in which an end surface 11 a is provided with an annular groove 12 extending in the circumferential direction. One end of the second member 20, that is, the connecting end 21 is also formed as a thick flange-shaped portion. From the end surface 21a of the coupling end portion 21, a dimension-shaped annular projection portion 22 that fits in the annular groove 12 of the first member 10 projects. Therefore, the U-shaped pipe 100 is formed by fitting the annular projection 22 of the second member 20 into the annular groove 12 of the first member 10 and connecting the first member 10 and the second member 20 ( 2, FIG. 3, FIG. 5). Legs 13 are formed on the lower outer wall of the first member 10 to improve sitting when the U-shaped tube is formed. Also, similar legs 23 and 24 are formed on the lower outer wall of the second member 20. As a method of making both members 10 and 20 inseparable from each other, an appropriate adhesive is applied to the end surfaces 11a and 21a of the coupling ends 11 and 21 including the annular groove 12 and the annular protrusion 22 so that both members 20 and 30 are joined. There is a method of gluing. Further, with the metal ring 30 housed in the annular groove 12, the annular projection 22 is fitted in the annular groove 12, and a high frequency is applied to the metallic ring 30 by a known high frequency generator to generate heat. The annular groove 12 and the annular protruding portion 22 may be welded by melting the resin around 30 (FIG. 4).

Further, with the annular projection 22 of the second member 20 fitted in the annular groove 12 of the first member 10, the both members 10, 20 are rotated in the directions indicated by the arrows in FIG. The other end side opening (one opening of the U-shaped tube) 14 of the member 10 and the other end side opening (the other opening of the U-shaped tube) 25 of the second member 20 are offset from each other (FIG. 6). It is also possible to form the U-shaped tube 100 ′ by adhering or welding both members 10 and 20. This offset angle makes it possible to absorb the displacement of the two tubes (not shown) to which the open ends 14, 25 of the U-shaped tube 100 'are connected. In the U-shaped pipes 100, 100 'of the above embodiment, the inner diameters of the open ends 14, 25 on both sides are different, but the present invention is not limited to this, and the inner diameters of the open ends on both sides are equal. May be

[Brief description of drawings]

FIG. 1 is a perspective view showing a first member and a second member constituting a U-shaped tube according to an embodiment of the present invention.

FIG. 2 is a side view of a U-shaped tube formed by connecting the first member and the second member of FIG.

3 is a vertical cross-sectional view of a U-shaped tube formed by connecting the first member and the second member of FIG.

FIG. 4 is an enlarged cross-sectional view of a connecting portion between a first member and a second member.

FIG. 5 is a perspective view of a U-shaped tube formed by connecting the first member and the second member of FIG.

FIG. 6 is a perspective view of a U-shaped tube formed by connecting the first member and the second member so that the other end side openings of the first member and the second member are offset.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st member 11 1st end 12 Annular groove 13 Leg 14 Opening of the other end 20 2nd member 21 1st end 22 Annular protrusion 23 Leg 24 Leg 30 Metal ring 100 U-shaped tube

Claims (3)

[Scope of utility model registration request] 1. A first member integrally formed of a synthetic resin having an annular cross section with both ends open and one end bent at about 90 °, and an annular cross section having both ends open and one end bent at about 90 °. And a second member integrally formed of a synthetic resin having one end of the first member and one end of the second member are connected to connect the first member and the second member to form a U-shaped tube. A U-shaped tube characterized by: 2. An annular groove extending in a circumferential direction is formed on an end surface of the first member on one end side, and an annular protrusion having a size and shape that can be fitted into the annular groove is formed on an end surface of the second member on one end side. By fitting the annular protrusion into the annular groove,
The U-shaped tube according to claim 1, wherein the first member and the second member are connected to each other. 3. The metal ring is housed in the annular groove, and the annular protrusion is fitted in the annular groove and a high frequency is applied from the outside to heat the metal ring to weld the annular groove and the annular protrusion. The U-shaped tube according to claim 2, wherein the connection between the first member and the second member is achieved.