JP4430516B2 - Pipe fitting and manufacturing method thereof - Google Patents

Description

  The present invention is used, for example, in a metal vertical pipe for draining rainwater, and in particular, a pipe joint used for connecting two pipe bodies arranged along different axial directions, and its It relates to a manufacturing method.

  2. Description of the Related Art Conventionally, as a pipe joint for routing a metal vertical rod, an elbow having a pipe connection portion to which the vertical rod is connected at both ends and being curved at an intermediate position between the two pipe connection portions A shape is used. Such a pipe joint is formed as an integral metal member by a casting method such as aluminum die casting. One of the pipe connecting portions of the pipe joint is constituted by an increased diameter pipe portion in which the inner diameter and the outer diameter are increased in order to receive and connect the vertical rod to the inside thereof. Further, the other pipe connecting portion of the pipe joint is constituted by a reduced diameter pipe portion in which the inner diameter and the outer diameter are reduced to allow the vertical hook to be fitted and connected to the outside. (For example, refer to Patent Document 1). In this pipe joint, the external appearance becomes worse as compared with the outer surface formed by a uniform plane due to the step created on the outer surface by one of the pipe connecting parts constituted by the increased diameter pipe part. Moreover, in the said pipe joint, since the outline along a extending direction is comprised with a straight line and a curve by the curved bending part, the impression which is not refined compared with the external appearance comprised only with the straight line is given. .

  For this reason, the applicant of the present invention has proposed a bent-shaped pipe joint having an appearance superior to that of the pipe joint without causing an increase in manufacturing cost and a manufacturing method for the bent pipe joint (Japanese Patent Application No. 2004-250899). .)

That is, an internal cylinder having a bent cylindrical shape and having pipe connection portions formed at both ends is integrally formed using, for example, aluminum die casting or injection molding of a plastic material, covering its outer surface and In order not to impair the function of each pipe connecting portion, metal outer cylinders are attached to the inner cylinder from both ends. Since the two outer cylinders are formed by dividing the outer cylinder member, the two outer cylinders have dividing surfaces having the same inclination with respect to the axis, and the two outer cylinders face each other so that the two dividing surfaces face each other. Since the tubular body is attached to the inner tubular body, the pipe joint is not formed with a step on the outer surface, and the contour line of the bent portion is constituted only by a straight line. Moreover, since the external appearance is improved by the both external cylinders, it is possible to reduce the manufacturing cost as compared to obtaining a homogeneous appearance by aluminum die casting.
Japanese Utility Model Publication No. 5-71320 (Page 2-5, Fig. 1)

  In the pipe joint, the inner cylindrical body is integrally formed as a bent cylindrical shape having the pipe connecting portions at both ends thereof, and the inner cylindrical body has both end portions of the outer cylindrical bodies. Therefore, the mold for the inner cylinder is increased in size accordingly. As is well known in the art, as the size of the mold increases, the manufacturing cost increases. Therefore, the increase in the size of the mold causes an increase in the manufacturing cost of the pipe joint.

  Therefore, an object of the present invention is to provide a bent-shaped pipe joint that can reduce the manufacturing cost without impairing the appearance that is superior to conventional pipe joints, and a method for manufacturing the same.

  In order to solve the above-described problem, the pipe joint according to claim 1 is a pipe joint provided at both ends with a pipe connection portion to which a pipe body is connected, and extends angularly from the common inner end. The inner cylinder formed by using the mold, and the outer cylinder member formed of metal with respect to the axial direction of the outer cylinder member Each tube of the inner cylinder is formed by being divided by a plane that makes an inclination, and has divided surfaces that are equally inclined with respect to the axial direction of the outer cylinder member, and the two divided surfaces abut each other. Two external cylinders that are attached to each of the cylinder parts and cover the cylinder parts over their entire length, and are connected to the connection outer ends of the cylinder parts of the internal cylinder, respectively. , Two pipe connecting cylinders extending beyond each external cylinder, each constituting the pipe connecting part Characterized in that it comprises a.

  According to a second aspect of the present invention, in the pipe joint according to the first aspect, the connection outer end portion of each cylindrical portion of the inner cylindrical body is externally attached to allow the fitting to the respective pipe connecting cylindrical bodies. A diameter-reducing pipe portion having a reduced diameter is provided, and each pipe connecting cylinder is fitted to each diameter-reducing pipe part inside each outer cylinder, and each diameter-reducing pipe part and each outer pipe It is characterized by being sandwiched between cylinders.

  A pipe joint according to a third aspect is the pipe joint according to the second aspect, wherein each of the pipe bodies can be fitted to the pipe connection part so as to cover the pipe connection part. Between the connection part and each said pipe body, the seal | sticker part which suppresses mutual slip and has a water stop property is provided.

  The method of manufacturing a pipe joint according to claim 4 is a method of manufacturing a pipe joint provided at both ends with a pipe connecting portion to which a pipe body is connected, each of which extends angularly from an inner end common to each other. Forming an inner cylinder having two cylinder portions that return to the outer end of the connection from the mold, and dividing the outer cylinder member formed of metal with a surface that is inclined with respect to the axial direction of the outer cylinder member Each of the cylinders in a state in which the cylinders have split surfaces that are equally inclined with respect to the axial direction of the outer cylinder member and are attached to the tube parts of the inner cylinder so as to abut the split surfaces. Forming two external cylinders that can cover the entire length of the portion, the two split surfaces of each external cylinder are abutted, and each external cylinder is said each cylinder of said internal cylinder Each external cylinder from each connection outer end of each cylinder part so as to cover each part Forming two pipe connection cylinders that can be extended beyond the external cylinders in a state of being connected to the connection outer ends of the cylinder parts, Connecting each of the tube connecting cylinders to each of the pipe connecting portions by connecting the pipe to the connection outer end of each of the cylinder portions of the inner cylinder.

  In the pipe joint according to claim 1, the pipe connection portions are configured by connecting the pipe connection cylinders, which are separate from the internal cylinder, to the connection outer ends of the internal cylinders. Therefore, it is not necessary to form the inner cylinder in such a size that both ends of the inner cylinder extend beyond the outer cylinder for the pipe connecting portions. For this reason, since the said internal cylinder can be made small compared with the conventional pipe joint, the metal mold | die for this internal cylinder can be made small, and the manufacturing cost of the said pipe joint can be reduced. it can. This is particularly advantageous when manufacturing a plurality of said pipe joints having different bending angles.

  More specifically, to connect the two pipe bodies, the pipe joint having a bending angle corresponding to the intersecting angle of the two pipe bodies is required. In order to obtain the pipe joint corresponding to the intersecting angle, A plurality of dies for the inner cylinder corresponding to the bending angle is required. In that case, in the pipe joint according to the present invention, since the respective molds for the inner cylinder according to various bending angles can be reduced in size, the inner cylinder requiring a large mold can be reduced. Compared with the conventional pipe joint which has, manufacturing cost can be reduced significantly.

In the pipe joint according to claim 2, since each of the pipe connection cylinders is sandwiched between each of the reduced diameter pipe portions and each of the external cylinders, the pipe connection cylinders and the inner cylinders Since the communication path from the inside to the outside of the pipe joint formed by the connection surface is complicated, the flow resistance in the communication path increases, so compared with the conventional internal cylinder formed integrally. Thus, it is possible to suppress a decrease in water tightness of the pipe joint due to the provision of the pipe connecting cylinders.

  In the pipe joint according to claim 3, since the seal portion is provided between the pipe connection portion and each of the pipe bodies, the connected pipe bodies are not easily detached, and the pipe bodies And water tightness between the pipe joint are enhanced.

  In the method for manufacturing a pipe joint according to claim 4, the pipe joint having an excellent appearance can be easily manufactured without causing an increase in manufacturing cost.

  According to the pipe joint according to the present invention, the pipe connection portions are configured by connecting the pipe connection cylinders to the connection outer ends of the internal cylinders. Thus, it is not necessary to form the inner cylinder for each pipe connecting portion in such a size that both ends thereof extend beyond the outer cylinder. For this reason, the metal mold | die for the said inner cylinder can be made small compared with the conventional metal mold | die, and the manufacturing cost of the said pipe joint can be reduced.

  The present invention will be described in detail with reference to the embodiment shown in FIGS.

  FIG. 1 shows a pipe joint 10 having an L shape as a whole according to the embodiment. FIG. 2 shows a longitudinal section of the pipe joint 10, and FIG. 3 shows the pipe joint 10 in an exploded manner for explaining the manufacturing process.

  As shown in FIG. 1, the pipe joint 10 includes an internal cylinder 11 (see FIG. 3) and an external cylinder attached and fixed to the outside of the internal cylinder so as to cover the internal cylinder. 12 and an external cylinder 13, and a pipe connection cylinder 14 and a pipe connection cylinder 15 connected to both ends of the internal cylinder 11 and extending beyond the external cylinder 12 or the external cylinder 13.

  As shown in FIG. 3, the inner cylindrical body 11 has a first cylindrical portion 16 and a second cylindrical portion 17 each having a cylindrical shape, and both the cylindrical portions 16 and 17 have an inner end 18 that is common to each other. Extending from each other so that their axes are orthogonal to each other. In this embodiment, the inner cylinder 11 is formed by using a mold (not shown) by injection molding of a plastic material such as vinyl chloride resin.

  The 1st cylinder part 16 and the 2nd cylinder part 17 exhibit the cylindrical shape prescribed | regulated by the surrounding wall of a uniform thickness and a uniform diameter mutually. The outer diameter of each of the outer ends of the first cylindrical portion 16 and the second cylindrical portion 17 is reduced in order to allow the outer end portions to be fitted into the pipe connecting cylinders 14 and 15, respectively. Diameter reducing pipe portions 16a and 17a are provided.

  The inner cylinder 11 has a groove 19 that goes around the outer wall surface 18 a of the inner end 18 common to both the cylinder parts 16, 17. The groove 19 has a width that extends from the inner end 18 along the axial direction of the cylindrical portions 16 and 17 on the outer wall surfaces 16a and 17a of the cylindrical portions 16 and 17, respectively.

A flange 20 that can be fitted in the groove 19 is attached to the outer wall surface 18 a of the inner end 18 of the inner cylinder 11. The flange 20 is formed of metal and has an elliptical ring shape that can go around the outer wall surface 18 a of the inner end 18. The flange 20 has a base portion 21 that can be fitted into the groove 19, and a ridge portion 22 that rises from the base portion 21 along both axes of the cylindrical portions 14 and 15 and a surface that is inclined at 45 degrees. In the illustrated example, the flange 20 can be divided into a flange portion 20 a and a flange portion 20 b along the long axis of the flange 20 so that the flange 20 can be attached to the outer wall surface 18 a of the inner end 18.

  The outer cylindrical body 12 has a cylindrical shape defined by a peripheral wall having a uniform diameter and a uniform thickness that allows the first cylindrical portion 16 to be inserted, that is, a cylindrical shape that extends with a uniform inner diameter and outer diameter. . The outer cylinder 12 has, at one end thereof, a hollow circular end face 12a that is orthogonal to the axis of the outer cylinder and is defined by the thickness of the outer cylinder. The outer cylinder 12 has a hollow elliptical end face 12b which is inclined by 45 degrees with the axis of the outer cylinder at the other end and is defined by the thickness of the outer cylinder.

  As shown in FIG. 2, the outer cylindrical body 12 is attached to the first cylindrical portion 16 so that the end surface 12 b serving as the other end contacts the flange 20. The thickness of the outer cylindrical body 12 is formed such that the outer wall surface 12c of the outer cylindrical body 12 coincides with the distal end surface 20c of the flange 20 in a state where the outer cylindrical body is mounted on the first cylindrical portion 16. Has been. The outer cylinder 12 has a length corresponding to the tip of the reduced diameter pipe portion 16 a of the first cylinder portion 16 of the inner cylinder 11 in a state where the outer cylinder is mounted on the first cylinder portion 16. Is formed.

  As shown in FIG. 3, the outer cylinder 13 has a cylindrical shape defined by a peripheral wall having a uniform diameter and a uniform thickness equal to the outer cylinder 12, and has a hollow circular end face at one end thereof. 13a, and the other end has a hollow ellipse-shaped end face 13b inclined 45 degrees with the axis. As with the external cylinder 12, the outer cylinder 13 is mounted on the second cylinder portion 17 so that the other end abuts on the flange 20, and one end of the outer cylinder 13 is attached to the second cylinder portion of the inner cylinder 11. The outer wall surface 13c coincides with the distal end surface 20c of the flange 20 (see FIG. 2).

  Each of the tube connecting cylinders 14 and 15 has a cylindrical shape having an inner diameter and an outer diameter equal to the cylindrical parts 16 and 17 of the inner cylinder 11. An increase in the inner diameter of each tube connection cylinder 14, 15 is made to be able to be fitted to each diameter-reduced tube portion 16 a, 17 a of each tube portion 16, 17 of the inner cylinder 11. Diameter pipe portions 14a and 15a are formed in each. At the other end of each of the tube connecting cylinders 14 and 15, annular seal portions 14b and 15b are provided on the outer surface along the circumferential direction. Each seal part 14b, 15b is comprised with the elastic body which has the function which can be elastically deformed and suppresses a slip.

  As shown in FIG. 2, each pipe connecting cylinder 14, 15 has its diameter-increasing pipe portions 14 a, 15 a inside the outer cylinders 12, 13, and the tube parts 16, 17 of the inner cylinder 11. The inner tube 11 is connected to both ends by being fitted to the respective reduced diameter pipe portions 16a and 17a. For this reason, the outer ends of the cylindrical portions 16 and 17 of the inner cylindrical body 11 become connection outer ends to the pipe connecting cylindrical bodies 14 and 15. In the present embodiment, in order to increase the connection strength between each of the increased diameter pipe portions 14a, 15a and each reduced diameter pipe portion 16a, 17a and to improve the water tightness of the fitted location, an adhesive is applied to the fitted location. ing.

  In the pipe joint 10, the pipe connection cylinders 14, 15 are connected to the external cylinders 12, 13 in a state where the external cylinders 12, 13 and the pipe connection cylinders 14, 15 are attached to the internal cylinder 11. Since it is exposed to the outside without being covered, it is possible to fit in the outer sides of the pipe connecting cylinders 14 and 15 an aluminum spatula 30 indicated by a two-dot chain line. It is possible to communicate the freshly made saddle 30 in a state where the axes of each other are orthogonal. For this reason, each pipe connection cylinder 14 and 15 functions as a pipe connection part of the pipe joint 10.

  The outer wall surface 10a of the pipe joint 10 is composed of the outer wall surfaces 12c and 13c of the outer cylinders 12 and 13, and the tip surface 20c of the flange 20, and is stepped from the outer wall surface 12c to the outer wall surface 13c through the tip surface 20c. It becomes a smooth flat surface without

  Next, the manufacturing method of the above-described pipe joint 10 will be described.

  The L-shaped inner cylinder 11 is formed as a whole by injection molding of a plastic material. As shown in FIG. 3, the inner cylindrical body 11 has a first cylindrical portion 16 and a second cylindrical portion 17 that are continuous at mutually common inner ends 18 so that their axes are orthogonal to each other. The outer end portions of the portions 16 and 17 are respectively provided with reduced diameter pipe portions 16 a and 17 a, and the outer wall surface 18 a of the inner end 18 is provided with a groove 19.

  The flange 20 is divided into a flange portion 20a and a flange portion 20b, and the inner end 18 of the inner cylinder 11 is sandwiched from both sides by both flange portions 20a and 20b (see arrow A1). The base portions 21 of both flange portions 20a and 20b are fitted into the groove 19 so that the shape of the groove 19 fits, and both flange portions 20a and 20b are attached to the inner end 18 and fixed.

  An outer cylinder member (not shown) having a cylindrical shape with a uniform aperture and a uniform thickness, that is, a cylindrical shape extending with a uniform inner diameter and outer diameter, which allows the insertion of both cylindrical portions 14 and 15. prepare. In the present embodiment, the outer cylinder member is formed by cutting and processing an aluminum vertical rod 30 connected to both pipe connecting portions 16 and 17. For this reason, the outer cylinder member has a uniform and smooth surface as a whole.

  The outer cylinder member is divided along a plane that makes an inclination of 45 degrees with the axial direction. By this division, two cylindrical bodies having division surfaces (12b) and (13b) that form an inclination of 45 degrees with respect to the axis are formed. When the two cylinders are respectively attached to both cylinder parts 14 and 15 of the inner cylinder 11, the outer ends of the cylinders coincide with the tips of the reduced diameter pipe portions 16a and 17a of the cylinder parts 14 and 15, respectively. As described above, the cylinders are cut according to the lengths of both cylinder parts 14 and 15 as necessary. Thereby, the outer cylinder 12 and the outer cylinder 13 are formed. The external cylinders 12 and 13 may have a length that extends beyond the reduced-diameter pipe portions 16a and 17a in a state where the external cylinders 12 and 13 are attached to both the cylinder parts 14 and 15.

  The outer cylinder 12 is mounted on the first cylinder portion 16 of the inner cylinder 11 such that both end faces 12b and 13b defining the other ends of the outer cylinders 12 and 13 are opposed to each other via the flange 20. In addition, the outer cylinder 13 is mounted on the second cylinder portion 17 of the inner cylinder 11 (see arrow A2). At this time, as shown in FIG. 2, the end surface 12 b that defines the other end of the outer cylinder 12 is brought into surface contact with one side surface 22 a of the protruding portion 22 of the flange 20, and the other end of the outer cylinder 13 is defined. The end surface 13b to be brought into surface contact with the other side surface 22b of the protruding portion 22 of the flange 20. In this manner, the outer cylinders 12 and 13 are connected to the inner cylinders in a state where the end faces 12b and 13b of the outer cylinders 12 and 13 are in surface contact with the both side surfaces 22a and 22b of the protrusion 22 of the flange 20, respectively. 11 is fixed by an adhesive. The fixing means may fix the outer cylinders 12 and 13 to the inner cylinder 11 by filling a caulking material between the outer cylinders 12 and 13 and the inner cylinder 11. The external cylinders may be fixed to the internal cylinder 11 by caulking the external cylinders with the external cylinders 12 and 13 attached to the body 11, and the present invention is not limited to the embodiment.

  The pipe connection cylinders 14 and 15 having an inner diameter and an outer diameter equal to the cylinder portions 16 and 17 of the inner cylinder 11 and having a cylindrical shape are formed by injection molding of a plastic material. As shown in FIG. 3, each pipe connecting cylinder 14, 15 is provided with an enlarged pipe portion 14 a, 15 a with an increasing inner diameter at each one end, and the other end along the circumferential direction on the outer surface. Circulating annular seal portions 14b and 15b are provided.

Each outer cylinder so that each diameter-increasing pipe part 14a, 15a of each pipe connection cylinder 14, 15 and each diameter-reducing pipe part 16a, 17a of each cylinder part 16, 17 of the inner cylinder 11 are fitted. The pipe connecting cylinders 14 and 15 are inserted into the inner sides of 12 and 13 (see arrow A3). As a result, each of the pipe connecting cylinders 14 and 15 has its diameter-increasing pipe portions 14a and 15a, the diameter-reducing pipe parts 16a and 17a of the cylinder parts 16 and 17 of the inner cylinder 11, and the outer cylinders 12, respectively. 13. In the present embodiment, in order to further strengthen the connection between the tube connecting cylinders 14 and 15 and the inner cylinder 11, the reduced diameter pipe portions 16a and 17a of the tube portions 16 and 17 and the tube connecting cylinders. An adhesive is applied in advance between each of the enlarged diameter pipe portions 14 a and 15 a of 14 and 15 and between each of the enlarged diameter pipe portions and each of the outer cylindrical bodies 12 and 13.

  Through the above manufacturing process, the pipe joint 10 in which both the outer cylinders 12 and 13 are attached to the inner cylinder 11 and the pipe connection cylinders 14 and 15 are connected is manufactured.

  In the pipe joint 10 of the present embodiment, the outer cylinders 12 and 13 covering both the cylinder portions 14 and 15 of the inner cylinder 11 are made of a single metal member and have a simple cylindrical shape. Since the outer cylinders 12 and 13 have similar appearances because they are formed by dividing the members, the inner cylinder 11 has an excellent appearance with a sense of unity as a whole (FIG. 1). reference.). Further, since the outer cylinder member is processed by cutting the aluminum vertical rod 30 formed by extruding a metal, the surface thereof has a uniform and smooth appearance. For this reason, it is formed integrally by casting, for example, and has an excellent appearance as compared with a conventional pipe joint.

  In the pipe joint 10, since both the outer cylinders 12, 13 attached to the inner cylinder 11 are formed of the aluminum vertical rod 30, as shown in FIG. 2, both pipe connection cylinders constituting the pipe connection portion There is no step between the aluminum armatures 30 and the external cylinders 12 and 13 connected by fitting the bodies 14 and 15 outward, and both the aluminum armatures 30 and the external cylinders 12 and 12 13 has an excellent external appearance.

  In the pipe joint 10, the contour line along the extending direction is constituted by a straight line by the outer cylinders 12, 13 and the tip surface 20 c of the flange 20. The appearance is improved as compared with a conventional pipe joint formed in a rounded shape with a curved portion.

  Further, in the pipe joint 10, since the pipe connecting cylinders 14 and 15, which are separate from the inner cylinder 11, are connected to both ends of the inner cylinder 11, the both pipe connecting portions are configured. The inner cylinder 11 can be made smaller as compared with the inner cylinder of a conventional pipe joint formed at both ends and provided with both pipe connection portions. For this reason, the metal mold | die (not shown) for forming the internal cylinder 11 can be made small, and the manufacturing cost of the pipe joint 10 can be reduced compared with the conventional pipe joint.

In the pipe joint 10, since the pipe connecting portions 14 and 15, which are separate from the inner cylindrical body 11, are connected to both ends of the inner cylindrical body 11 to form both pipe connecting portions, the bending angles are different. When manufacturing the pipe joint 10, since some of the components can be used together, it is not necessary to remake all the components into a new shape, and the manufacturing cost can be suppressed. More specifically, in order to manufacture the pipe joint 10 having different bending angles, it is only necessary to change the vicinity of the bent portion 10b of the pipe joint 10, so that each pipe having the same shape regardless of the bending angle of the pipe joint 10 is used. The connecting cylinders 14 and 15 can be used, and the pipe connecting cylinders can also be used. Moreover, since the outer cylinders 12 and 13 should just change the inclination-angle of the division surfaces 12b and 13b with the axis line, the said outer cylinder member for the outer cylinders 12 and 13 can be combined, What is necessary is just to change the angle of a division | segmentation. The inner cylindrical body 11 and the flange 20 need to be remade into a new shape according to a desired bending angle. Since it can be formed small, the internal cylinder 11 can be formed without using a large mold, and an increase in manufacturing cost due to remodeling of the internal cylinder can be suppressed. Therefore, when manufacturing a plurality of pipe joints 10 having different bending angles, the manufacturing cost can be greatly reduced as compared with a conventional pipe joint.

  In the pipe joint 10, each pipe connection part is configured by connecting the pipe connection cylinders 14 and 15, which are separate from the internal cylinder 11, to both ends of the internal cylinder 11. Even if the length of each pipe connecting portion is increased in order to stabilize the fitting state of each of the aluminum armatures 30 fitted into the pipe, the length of each of the pipe connecting cylinders 14 and 15 may be increased. There is no need to enlarge the integral internal cylinder having pipe connecting portions at both ends like a pipe joint.

  In the pipe joint 10, the pipe connecting portions 14 and 15, which are separate from the inner cylindrical body 11, are connected to both ends of the inner cylindrical body 11 to form both pipe connecting portions. It is formed by the cylinder 11 and the both pipe connection cylinders 14 and 15. For this reason, the watertightness of the connection part of the inner cylinder 11 and both pipe connection cylinders 14 and 15 becomes important. In the pipe joint 10 of the present embodiment, as shown in the enlarged view in the one-dot chain line circle of FIG. 2, the diameter-increasing pipe portions 14 a and 15 a of the pipe connection cylinders 14 and 15 are the cylinder parts of the inner cylinder 11. 16 and 17 are sandwiched between the reduced-diameter pipe portions 16a and 17a and the outer cylinders 12 and 13, so that a communication path formed from this connection surface and extending from the inside to the outside of the pipe joint 10 is connected to both pipes. The cylinders 14 and 15 are intricately arranged along the surface shapes of the diameter-increasing pipe portions 14a and 15a. Since the flow resistance in the communication path increases due to the complicated communication path, in the pipe joint 10, the connection portion between the inner cylinder 11 and both pipe connection cylinders 14, 15 has a high water-stopping property, Compared to a conventional pipe joint having an integrally formed internal cylinder, a decrease in watertightness is suppressed.

  In the pipe joint 10, as shown in FIG. 2, in the bent portion 10 b, a mutual joint between the two external cylinders is formed by the flange 20 and the two external cylinders 12 and 13 in surface contact with the flange. Yes. The flange 20 has a certain thickness, and both end faces 12b and 13b of both external cylinders 12 and 13 contacting the flange are defined by the same dividing surface. The mutual seams are symmetrical with respect to the flange 20 as an axis. Further, the outer cylindrical surface 12 is formed of a smooth flat surface having no step from the outer wall surface 12c of the outer cylindrical body 12 to the outer wall surface 13c of the outer cylindrical body 13 through the distal end surface 20c of the flange 20. Therefore, the bent portion 10b of the pipe joint 10 is formed by joining two metal members by welding, and shrinkage occurs in the vicinity of the joining portion due to a temperature change during welding, or a distorted welding trace is formed at the joining location. Compared to conventional pipe joints, it has an excellent appearance.

  In the pipe joint 10, the flange 20 and both end faces 12 b and 13 b of the external cylinders 12 and 13 are in surface contact with each other at the bent portion 10 b, so that both ends that become split surfaces when the outer cylinder member is divided are used. The surfaces 12b and 13b are not exposed to the outside and have high safety.

  Since the pipe joint 10 has a configuration covered with both external cylinders 12 and 13 made of metal, the pipe joint 10 is integrally formed by pipe joint formed by welding connection of two metal pipes or casting. Compared with the conventional pipe joint formed in this, it has the strength which is not inferior.

  In the pipe joint 10, seal portions 14 b and 15 b are provided at the other end portions of the pipe connecting cylinders 14 and 15 that function as pipe connecting portions to which both aluminum vertical rods 30 shown by two-dot chain lines in FIG. 2 are connected. Since it is provided, the connected aluminum vertical rods 30 are not easily detached. Further, in the pipe joint 10, sufficient water tightness is secured by the seal portions 14 b and 15 b at the connection portion between the pipe joint 10 and the both aluminum armatures 30.

  Therefore, according to the pipe joint 10 which concerns on an Example, a manufacturing cost can be reduced, without impairing the external appearance outstanding compared with the conventional pipe joint.

  According to the method for manufacturing the pipe joint 10 according to the embodiment, for example, the pipe joint having the above-described features as compared with applying a casting method with high processing accuracy in order to obtain a surface with uniform color and texture. 10 can be manufactured without causing an increase in manufacturing cost.

  In addition, according to the manufacturing method described above, it is easy to form the outer cylinders 12 and 13 having the divided surfaces (12b) and (13b) having the same inclination with respect to the axial direction and having a uniform appearance. Can be formed.

  According to the manufacturing method described above, when manufacturing a plurality of pipe joints 10 having different bending angles, it is possible to easily manufacture a pipe joint 10 that can be used for some of the components.

  As described above, since the inner cylinder 11 is formed by injection molding of a plastic material, the manufacturing cost can be reduced compared to the case where the inner cylinder 11 is formed by aluminum die casting.

  In the above-described embodiment, the flange 20 is attached to the groove 19 formed in the inner cylindrical body 11. However, as shown in FIG. 4, the inner portion in which the groove 19 is provided on the outer wall surface 18a of the inner end 18 is provided. Instead of the cylindrical body 11, an internal cylindrical body 110 having a flange 200 on the outer wall surface 180a can be used. The flange 200 rises with a certain thickness from the outer wall surface 180a along surfaces that are inclined equally to each other with respect to both axial lines of both the cylindrical portions 160 and 170. The inner cylinder 110 can be integrally formed using a die (not shown) by aluminum die casting, that is, die casting using an aluminum alloy material, or by injection molding of a plastic material. Since the pipe joint 100 manufactured using the internal cylinder 110 is the same as the pipe joint 10 of the embodiment except that the flange 20 is attached, the same functional parts are denoted by the same reference numerals as those of the embodiment. Detailed description thereof will be omitted. When the inner cylinder 110 is formed by aluminum die casting, the bent portion 100b of the pipe joint 100 is constituted by the flange 200 formed of an aluminum alloy and the both outer cylinders 12 and 13 formed of the aluminum alloy. Therefore, it has an excellent appearance with a sense of unity throughout. Moreover, since each pipe connection cylinder 14 and 15 is also formed by aluminum die casting, since the inner cylinder 110 is made of metal, the pipe joint 100 is entirely made of metal. Excellent fire resistance. Furthermore, if the outer cylinders 12 and 13 are attached to the inner cylinder 11 so that the divided surfaces 12b and 13b of the outer cylinders 12 and 13 are brought together, an effect substantially equal to the above effect can be obtained. The flange can be eliminated. The inner cylinder without the flange and groove can be integrally formed by aluminum die casting or by injection molding of a plastic material.

  Each of the seal portions 14b and 15b prevents the pipe connecting cylinders 14 and 15 and the aluminum vertical rods 30 fitted to the outer sides of the pipe connecting cylinders 14 and 15 from slipping each other, and each pipe connection in a connected state. For example, each pipe excluding the other end can be used as long as it can ensure water-stopping from the inside to the outside of the pipe joint 10 that passes between the cylinders 14 and 15 and each of the aluminum vertical rods 30. It may be provided on the outer surface of the connecting cylinders 14, 15, or may be provided on each aluminum vertical rod 30.

  Further, in the pipe joint 10, even if the seal portions 14 b and 15 b are not provided, the manufacturing cost can be reduced without impairing the appearance that is superior to the conventional pipe joint. 14b and 15b can also be eliminated.

In the above-described embodiment, only the outer cylinders 12 and 13 are formed from the outer cylinder member, but two outer cylinders formed from the same outer cylinder member are attached to the inner cylinder to connect the pipe joint. What is necessary is just to manufacture and you may form a some external cylinder from the said outer cylinder member. In this case, any external cylinder may be attached to the internal cylinder 11 as long as they are compatible with each other. However, when two outer cylinders that are adjacent to each other through the dividing surface when the outer cylinder member is divided are attached to the inner cylinder 11, a more integrated appearance can be obtained. It is desirable to form a pipe joint using two external cylinders that are adjacent to each other.

1 is a perspective view showing a pipe joint 10 according to the present invention. It is sectional drawing which shows the longitudinal cross-section in FIG. It is the perspective view which decomposed | disassembled and showed the pipe joint 10 which concerns on this invention. It is the perspective view which decomposed | disassembled and showed the pipe joint 100 which is an example different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 100 Pipe joint 11, 110 Inner cylinder 12, 13 External cylinder 12b, 13b End surface (as a dividing surface) 14, 15 Pipe connection cylinder 14a, 15a Reduced diameter pipe part 14b, 15b Seal part 16, 17 cylinder Parts 18, 180 inner end 30 (as tube)

Claims (4)

A pipe joint provided at both ends with a pipe connection part to which a pipe body is connected,
An inner cylinder formed by using a mold, and an outer cylinder formed of metal, having two cylindrical portions extending from the common inner end to each other at an angular angle and returning to the connection outer end. The member is formed by being divided by a surface that is inclined with respect to the axial direction of the outer cylinder member, and has divided surfaces that are equally inclined with respect to the axial direction of the outer cylinder member, and the two divided surfaces are Two external cylinders that are attached to each of the cylinder parts and cover the cylinder parts over their entire length so as to cover the cylinder parts of the inner cylinders so as to face each other, and the internal cylinders A pipe joint comprising: two pipe connection cylinders connected to the connection outer ends of the cylinder parts, extending beyond the external cylinders, and each constituting the pipe connection part.   The connection outer end portion of each cylindrical portion of the inner cylindrical body is provided with a reduced-diameter pipe portion whose outer diameter decreases so as to allow fitting into each of the pipe connecting cylindrical bodies. 2. The pipe according to claim 1, wherein the pipe is fitted into the respective reduced diameter pipe portions inside each of the outer cylindrical bodies, and is sandwiched between the respective reduced diameter pipe parts and the respective outer cylindrical bodies. Fittings.   Each tube body can be fitted to each tube connection portion so as to cover each tube connection portion, and between each tube connection portion and each tube body, mutual slip is suppressed and The pipe joint according to claim 2, wherein a seal portion having water-stopping properties is provided. A method for manufacturing a pipe joint comprising pipe connecting portions at both ends to which a pipe body is connected,
Forming an inner cylinder from a mold that has two cylindrical portions that extend angularly from each other from an inner end that is common to each other and each returns to the connection outer end;
By dividing the outer cylinder member formed of metal with a surface that is inclined with respect to the axial direction of the outer cylinder member, the outer cylindrical member has divided surfaces that are equally inclined with respect to the axial direction of the outer cylinder member, and Forming two outer cylinders capable of covering each cylinder part over its entire length in a state of being attached to each cylinder part of the inner cylinder so as to abut both the split surfaces;
The external cylinders from the connection outer ends of the cylinders so that the two split surfaces of the external cylinders are abutted and the external cylinders cover the cylinders of the internal cylinders. Wearing each,
Forming two pipe connection cylinders that can extend beyond the external cylinders in a state of being connected to the connection outer ends of the cylinder parts, and connecting the pipe connection cylinders to the internal cylinders; A method of manufacturing a pipe joint, comprising: forming each pipe connection portion with each pipe connection cylinder by connecting to the connection outer end of each cylinder part of a body.

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