Fittings and fitting sets

Abstract

To provide a joint capable of preventing erroneous connection between a male member and a female member.SOLUTION: A joint is the medical joint including a male member and a female member which are mutually connected. The male member includes a male member body having a flow passage inside; and a male member side peripheral wall part arranged in the periphery of the male member body. The female member includes: a female member body having a flow passage inside; and a female member side peripheral wall part arranged in the periphery of the female member body. On the male member side peripheral wall part and the female member side peripheral wall part, a plurality of engagement projections and engagement recessions are alternately formed at tip parts in a circumferential direction. When the male member is connected to the female member, the male member body is fitted to the female member body, and also the engagement projections and the engagement recessions of the male member side peripheral wall part and the female member side peripheral wall part are engaged with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a joint consisting of a male member and a female member, and to a joint set consisting of a plurality of pairs of joints. [Background technology]

[0002] Conventionally, in medical settings, a medical solution stored in a medical solution bag is administered into a patient's body through a tube such as a catheter, and a gas such as oxygen is sent into the patient's body through a tube using a device. A joint consisting of a male member and a female member is provided in the middle of the tube, and a medical professional can administer or send a specified medical solution or gas into the body by connecting the male member and female member of a specified joint (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2000-517205 [Patent Document 2] Special Publication No. 2005-501616 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in busy medical settings, medical staff may mistakenly connect the male and female parts of the fittings on the tubes. In such cases, patients who receive or receive the wrong medicinal liquid or gas may be put in a life-threatening, dangerous condition due to a lack of the medicinal liquid or gas that should have been administered, or due to the effects of the wrong medicinal liquid or gas.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a coupling and a coupling set that can prevent erroneous connection of a male member and a female member. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides a medical joint consisting of a male member and a female member which are connected to each other, wherein the male member comprises a male member main body having a flow path therein, and a male member side peripheral wall portion provided around the male member main body, and the female member comprises a female member main body having a flow path therein, and a female member side peripheral wall portion provided around the female member main body, and the male member side peripheral wall portion and the female member side peripheral wall portion have a plurality of interlocking convex portions and interlocking concave portions formed alternately along the circumferential direction at their tip portions, and when the male member and female members are connected, the male member main body and the female member main body fit together, and the interlocking convex portions and interlocking concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion interlock with each other.

[0007] According to this, the male member main body and the female member main body are fitted together, and the interlocking convex portion and interlocking concave portion of the male member side peripheral wall portion and the female member side peripheral wall portion interlock with each other, so that the male member and the female member can be firmly connected. In addition, when the male member and the female member are connected, the male member main body and the female member main body are covered by the male member side peripheral wall portion and the female member side peripheral wall portion, so that the joint can be protected from dirt and dust from the outside, or various liquids generated during surgery, etc. Furthermore, when the male member and the female member of the joint are connected, if at least one of the shapes, sizes, positions, and numbers of the interlocking convex portion and interlocking concave portion of the male member side peripheral wall portion and the female member side peripheral wall portion is different, the male member and the female member of the joint are not connected correctly, so that erroneous connection of the male member and the female member of the joint can be prevented.

[0008] The male member main body may be formed to a height that protrudes in the axial direction beyond the engaging convex portion of the male member side peripheral wall portion, which makes it easier to align and fit the tip end of the male member main body with the tip end of the female member main body when the male member and female member are connected.

[0009] Furthermore, the interlocking convex portion of the male member side peripheral wall portion may be provided with a predetermined space between the male member main body, and when the male member and the female member are connected, the female member main body of the female member may be fitted into the space between the interlocking convex portion of the male member side peripheral wall portion and the male member main body. According to this, when the male member and the female member are connected, the interlocking convex portion of the male member side peripheral wall portion supports the outer circumferential surface of the female member main body from the radially outside, thereby making it possible to more firmly connect the male member and female member of the joint.

[0010] In addition, the mating convex portion of the male member side peripheral wall portion may have an engaging convex portion formed on its inner peripheral surface, while the female member main body may have an engaging concave portion formed on its outer peripheral surface, and when the male member and the female member are connected, the engaging convex portion of the male member side peripheral wall portion and the engaging concave portion of the female member main body may engage with each other. In this way, when the male member and the female member are connected, the engaging convex portion of the male member side peripheral wall portion and the engaging concave portion of the female member main body engage with each other, thereby making it possible to more firmly connect the male member and the female member of the coupling.

[0011] The mating convex portion of the female member-side peripheral wall portion may be provided at a position where it contacts the outer circumferential surface of the female member main body when the male member and the female member are connected. In this way, when the male member and the female member are connected, the mating convex portion of the female member-side peripheral wall portion supports the outer circumferential surface of the female member main body from the radially outside together with the mating convex portion of the male member-side peripheral wall portion, thereby making it possible to more firmly connect the male member and the female member of the joint.

[0012] In addition, in a joint set provided with a plurality of joints, each joint may be formed such that at least one of the shapes, sizes, positions, and numbers of the interlocking convex portions and interlocking concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion are different from each other. According to this, for a regular set of male and female members in which the shapes, sizes, positions, and numbers of the interlocking convex portions and interlocking concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion are the same, the interlocking convex portions and interlocking concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion interlock with each other, so that the male and female members can be connected correctly. On the other hand, for an irregular set of male and female members in which at least one of the shapes, sizes, positions, and numbers of the interlocking convex portions and interlocking concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion are different from each other, the interlocking convex portions and interlocking concave portions of the male and female member side peripheral wall portion cannot interlock with each other, so that the male and female members cannot be connected correctly. This allows the connection of a correct pair of male and female components while preventing the connection of an incorrect pair of male and female components, making it possible to safely use multiple pairs of fittings depending on the various applications and purposes in the medical field.

[0013] In addition, the male member-side peripheral wall portion and the female member-side peripheral wall portion of each pair of joints may be colored the same color, and the colors of the joints in each pair may be different from each other. This makes it possible to visually distinguish between the male and female members of a correct pair, thereby further preventing erroneous connection of the male and female members of the joints. Effect of the Invention

[0014] According to the present invention, the male and female members can be firmly connected to each other because the male and female member main bodies are fitted together and the mating convex and concave portions of the male and female member side peripheral wall portions are mated with each other. When the male and female members are connected to each other, the male and female member main bodies are covered by the male and female member side peripheral wall portions, so that the joint can be protected from dirt and dust from the outside, or various liquids generated during surgery. Furthermore, when the male and female members of the joint are connected to each other, if at least one of the shapes, sizes, positions, and numbers of the mating convex and concave portions of the male and female member side peripheral wall portions is different, the male and female members of the joint are not connected correctly, so that erroneous connection of the male and female members of the joint can be prevented. [Brief description of the drawings]

[0015] [Figure 1] FIG. 2 is a perspective view showing a state before connection of the joint set according to the present invention. [Diagram 2] FIG. 2 is a perspective view showing the state after the joint set of FIG. 1 has been connected. [Diagram 3] FIG. 2 is a perspective view of a first set of fittings in the fitting set of FIG. 1. [Figure 4] FIG. 4(a) is a front view and FIG. 4(b) is a left side view of the joint in FIG. [Diagram 5] 5A is a cross-sectional view taken along line AA in FIG. 4, and FIG. 5B is a partial cross-sectional view taken along line BB in FIG. [Figure 6] FIG. 4 is a perspective view showing whether the female and male members of the first to third sets of joints can be connected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of a joint set including a plurality of joints according to the present invention will be described with reference to Figs. 1 to 6.

[0017] As shown in Figs. 1 and 2, this joint set is provided with three sets of joints: a first set of joints 1a, a second set of joints 1b, and a third set of joints 1c.

[0018] In this specification, the same components in the first set of fittings 1a, the second set of fittings 1b, and the third set of fittings 1c are given the same numbers, and the letter "a" is added to the numbers of the components of the first set of fittings 1a, the letter "b" is added to the numbers of the components of the second set of fittings 1b, and the letter "c" is added to the numbers of the components of the third set of fittings 1c. In the following, the first set of fittings 1a will be described in detail, and then the second set of fittings 1b and the third set of fittings 1c will be described, focusing on the differences from the first set of fittings 1a.

[0019] As shown in FIG. 3, the first set of joints 1a is composed of a male member 10a and a female member 20a provided at the boundary between tubes C1 and C2 which are to be connected to each other.

[0020] The male member 10a is provided with a male member main body 11a connected to a tube C1 and having a flow path P1 formed therein through which a fluid such as a chemical solution or a gas flows, and a male member side peripheral wall portion 12a provided around the male member main body 11a. On the other hand, the female member 20a is provided with a female member main body 21a connected to a tube C2 and having a flow path P2 formed therein through which a fluid such as a chemical solution or a gas flows, a female member side peripheral wall portion 22a provided around the female member main body 21a, and a hook member 23a hooked to a frame or the like (not shown) on the tube C2 side of the female member side peripheral wall portion 22a.

[0021] The male member body 11a and the female member body 21a are formed in a cylindrical shape with a length and diameter that allow them to fit into each other, and when the male member 10a and the female member 20a are connected, the male member body 11a fits into the female member body 21a.

[0022] Moreover, the male member main body 11a is provided with a tapered inclined surface 111a on the peripheral edge of the tip, making it easy to fit into the female member main body 21a.

[0023] In addition, the male member main body 11a has an annular groove extending circumferentially formed on its outer circumferential surface, and a sealing member 112a such as a packing is fitted into the groove so that the male member main body 11a fits tightly against the female member main body 21a via the sealing member 112a.

[0024] In addition, the male member main body 11a is formed to a height that protrudes in the axial direction beyond the mating convex portion 122a of the male member side peripheral wall portion 12a, making it easy to align and fit the tip end of the male member main body 11a to the tip end of the female member main body 21a.

[0025] 5(b), the female member main body 21a has an engagement recess 211a formed on the outer circumferential surface thereof, which extends in the circumferential direction and is recessed radially inward. When the male member 10a and the female member 20a are connected, this engagement recess 211a engages with an engagement protrusion 124a of the male member side peripheral wall portion 12a, which will be described later.

[0026] The male member side peripheral wall portion 12a is provided with four interlocking protrusions 122a formed so as to extend in the axial direction from the tip of the peripheral wall portion main body 121a, and four interlocking recesses 123a formed between the interlocking protrusions 122a, and these interlocking protrusions 122a and interlocking recesses 123a are arranged alternately along the circumferential direction. On the other hand, the female member side peripheral wall portion 22a is provided with four interlocking protrusions 222a formed so as to extend in the axial direction from the tip of the peripheral wall portion main body 221a, and four interlocking recesses 223a formed between the interlocking protrusions 222a, and these interlocking protrusions 222a and interlocking recesses 223a are arranged alternately along the circumferential direction. The female member side peripheral wall portion 22a is formed so as to have a slightly larger outer diameter than the male member side peripheral wall portion 12a.

[0027] The interlocking convex portion 122a of the male member side peripheral wall portion 12a and the interlocking concave portion 223a of the female member side peripheral wall portion 22a are formed to match each other in shape (contour), size (axial length and circumferential width), position (circumferential and radial positions), and number (four). On the other hand, the interlocking concave portion 123a of the male member side peripheral wall portion 12a and the interlocking convex portion 222a of the female member side peripheral wall portion 22a are also formed to match each other in shape (contour), size (axial length and circumferential width), position (circumferential and radial positions), and number (four). In the first joint 1a, the interlocking convex portion 122a of the male member side peripheral wall portion 12a and the interlocking convex portion 222a of the female member side peripheral wall portion 22a are formed to have a circumferential width ratio of approximately 2:1.

[0028] Thus, when the male member 10a and the female member 20a are connected, the interlocking convex portion 122a of the male member side peripheral wall portion 12a fits into the interlocking concave portion 223a of the female member side peripheral wall portion 22a, and the interlocking convex portion 222a of the female member side peripheral wall portion 22a fits into the interlocking concave portion 123a of the male member side peripheral wall portion 12a, so that the interlocking convex portions 122a, 222a and the interlocking concave portions 123a, 223a of the male member side peripheral wall portion 12a and the female member side peripheral wall portion 22a interlock with each other without any gaps.

[0029] In addition, a predetermined space is provided between the mating convex portion 122a of the male member side peripheral wall portion 12a and the male member main body 11a, and when the male member 10a and the female member 20a are connected, the female member main body 21a of the female member 20a fits into the space between the mating convex portion 12a of the male member side peripheral wall portion 12a and the male member main body 11a. According to this, when the male member 10a and the female member 20a are connected, the mating convex portion 122a of the male member side peripheral wall portion 12a supports the outer circumferential surface of the female member main body 21a from the radial outside, so that the male member 10a and the female member 20a of the joint 1a can be connected more firmly.

[0030] 5(b), the engaging protrusion 122a of the male member side peripheral wall portion 12a has an engaging protrusion 124a formed on its inner peripheral surface, which protrudes radially inward. When the male member 10a and the female member 20a are connected, the engaging protrusion 124a engages with the engaging recess 211a of the female member main body 21a as described above, thereby enabling a stronger connection between the male member 10a and the female member 20a of the joint 1a.

[0031] The engaging protrusion 222a of the female member side peripheral wall portion 22a is provided at a position where there is a slight gap between it and the female member main body 21a, and when the male member 10a and the female member 20a are connected, the female member main body 21a expands slightly radially outward to abut against the outer circumferential surface of the female member main body 21a. According to this, when the male member 10a and the female member 20a are connected, the engaging protrusion 222a of the female member side peripheral wall portion 22a supports the outer circumferential surface of the female member main body 21a from the radial outside together with the engaging protrusion 122a of the male member side peripheral wall portion 12a, so that the male member 10a and the female member 20a of the joint 1a can be more firmly connected. The engaging protrusion 222a of the female member side peripheral wall portion 22a may be provided at a position where it abuts against the outer circumferential surface of the female member main body 21a in advance.

[0032] 3 and 5(a), the hook member 23a includes a first hook portion 231a provided adjacent to the female member side peripheral wall portion 22a, a second hook portion 232a provided on the tube C2 side of the first hook portion 231a, and a threaded portion 233a for axially advancing and retracting the second hook portion 232a relative to the first hook portion 231a. With this, when a frame body or the like is disposed between the first hook portion 231a and the second hook portion 232a, if the second hook portion 232a is screwed on the threaded portion 233a toward the first hook portion 231a, the frame body or the like can be sandwiched between the first hook portion 231a and the second hook portion 232a, and the entire joint 1a can be hooked to the frame body.

[0033] 4 and 5 show a state in which the second hook portion 232a has been removed. H1 and H2 in the drawings are cover members that cover the connection portions of the tubes C1, C2 and the male member 10a and the female member 10b.

[0034] According to the structure of the male member 10a and the female member 20a of the first joint 1a described above, when the male member 10a and the female member 20a are connected, the male member main body 11a and the female member main body 21a fit together, and the mating convex portions 122a, 222a and mating concave portions 123a, 223a of the male member side peripheral wall portion 12a and the female member side peripheral wall portion 22a engage with each other, thereby enabling the male member 10a and the female member 20a to be firmly connected.

[0035] In addition, when the male member 10a and the female member 20a are connected, the male member main body 11a and the female member main body 21a are surrounded by the male member side peripheral wall portion 12a and the female member side peripheral wall portion 22a, thereby protecting the joint from external dirt and dust, or various liquids generated during surgery, etc.

[0036] Furthermore, when the male member 10a and female member 20a of the joint 1a are connected, if at least one of the shape, size, position, and number of the mating convex portions 122a, 222a and mating concave portions 123a, 223a of the male member side peripheral wall portion 12a and the female member side peripheral wall portion 22a is different, the male member 10a and female member 20a of the joint 1a will not be connected correctly, thereby preventing erroneous connection of the male member 10a and female member 10a of the joint 1a.

[0037] Next, the second set of joints 1b will be described.

[0038] In the second joint 1b, the male member side peripheral wall 12b has two mating projections 122b and two mating recesses 123b alternately formed along the circumferential direction at the tip of the peripheral wall main body 121b, while the female member side peripheral wall 22b has two mating projections 222b and two mating recesses 223b alternately formed along the circumferential direction at the tip of the peripheral wall main body 221b.

[0039] The interlocking protrusions 122b of the male member side peripheral wall portion 12b and the interlocking recesses 223b of the female member side peripheral wall portion 22b are formed to match each other in shape (contour), size (axial length and circumferential width), position (circumferential and radial positions), and number (2). On the other hand, the interlocking recesses 123b of the male member side peripheral wall portion 12b and the interlocking protrusions 222b of the female member side peripheral wall portion 22b are also formed to match each other in shape (contour), size (axial length and circumferential width), position (circumferential and radial positions), and number (2). In the second joint 1b, the interlocking protrusions 122b of the male member side peripheral wall portion 12b and the interlocking protrusions 222b of the female member side peripheral wall portion 22b are formed to have a circumferential width ratio of approximately 3:1.

[0040] Thus, when the male member 10b and the female member 20b are connected, the interlocking convex portion 122b of the male member side peripheral wall portion 12b fits into the interlocking concave portion 223b of the female member side peripheral wall portion 22b, and the interlocking convex portion 222b of the female member side peripheral wall portion 22b fits into the interlocking concave portion 123b of the male member side peripheral wall portion 12b, so that the interlocking convex portions 122b, 222b and the interlocking concave portions 123b, 223b of the male member side peripheral wall portion 12b and the female member side peripheral wall portion 22b interlock with each other without any gaps.

[0041] Next, the third set of joints 1c will be described.

[0042] In the third joint 1c, the male member side peripheral wall 12c has three mating projections 122c and three mating recesses 123c alternately formed along the circumferential direction at the tip of a peripheral wall main body 121c, while the female member side peripheral wall 22c has three mating projections 222c and three mating recesses 223c alternately formed along the circumferential direction at the tip of a peripheral wall main body 221c.

[0043] The interlocking protrusions 122c of the male member side peripheral wall portion 12c and the interlocking recesses 223c of the female member side peripheral wall portion 22c are formed to match each other in shape (outline), size (axial length and circumferential width), position (circumferential and radial positions), and number (three). On the other hand, the interlocking recesses 123c of the male member side peripheral wall portion 12c and the interlocking protrusions 222c of the female member side peripheral wall portion 22c are also formed to match each other in shape (outline), size (axial length and circumferential width), position (circumferential and radial positions), and number (three). In the third joint 1c, the interlocking protrusions 122c of the male member side peripheral wall portion 12c and the interlocking protrusions 222c of the female member side peripheral wall portion 22c are formed to have a circumferential width ratio of approximately 2:1.

[0044] Thus, when the male member 10c and the female member 20c are connected, the interlocking convex portion 122c of the male member side peripheral wall portion 12c fits into the interlocking concave portion 223c of the female member side peripheral wall portion 22c, and the interlocking convex portion 222c of the female member side peripheral wall portion 22c fits into the interlocking concave portion 123c of the male member side peripheral wall portion 12c, so that the interlocking convex portions 122c, 222c and the interlocking concave portions 123c, 223c of the male member side peripheral wall portion 12c and the female member side peripheral wall portion 22c interlock with each other without any gaps.

[0045] In this way, each set of joints 1a, 1b, 1c is formed so that the shapes, sizes, positions and numbers of the mating convex portions 122a, 122b, 122c, 222a, 222b, 222c and the mating concave portions 123a, 123b, 123c, 223a, 223b, 223c of the male member side peripheral wall portions 12a, 12b, 12c and the female member side peripheral wall portions 22a, 22b, 22c are all different from one another.

[0046] According to this, as shown in Figure 6, for a correct pair of male members 10 and female members 20 (for example, male member 10a and female member 20a in Figure 6) in which the shapes, sizes, positions and numbers of the interlocking convex portions 122, 222 and interlocking concave portions 123, 223 of the male member side peripheral wall portion 12 and the female member side peripheral wall portion 22 match, the interlocking convex portions 122, 222 and interlocking concave portions 123, 223 of the male member side peripheral wall portion 12 and the female member side peripheral wall portion 22 interlock with each other, so that the male member 10 and the female member 20 can be correctly connected. On the other hand, for an irregular pair of male members 10 and female members 20 (e.g., male members 10b, 10c and female member 20a in FIG. 6) in which at least one of the shapes, sizes, positions, and numbers of the interlocking convex portions 122, 222 and interlocking concave portions 123, 223 of the male member side peripheral wall portion 12 and the female member side peripheral wall portion 22 is different, the interlocking convex portions 122, 222 and interlocking concave portions 123, 223 of the male member side peripheral wall portion 12 and the female member side peripheral wall portion 22 cannot interlock with each other, and therefore the male members 10 and the female members 20 cannot be properly connected. This allows connection of a regular pair of male members 10 and female members 20, while preventing connection of an irregular pair of male members 10 and female members 20, making it possible to safely use multiple pairs of couplings 1 according to various uses and purposes in the medical field.

[0047] In addition, the joints 1 of each set may be colored the same color on the male member side peripheral wall portion 12 and the female member side peripheral wall portion 22, and the colors may be different between the joints 1 of each set (for example, the joints 1a of the first set may be blue, the joints 1b of the second set may be green, and the joints 1c of the third set may be red). In this case, the male members 10 and female members 20 of the correct set can be visually distinguished, so that erroneous connection of the male members 10 and female members 20 of the joints 1 can be further prevented.

[0048] In the above embodiment, the interlocking convex portions 122, 222 and the interlocking concave portions 123, 223 are described as being arranged in a number of two to four at equal intervals in the circumferential direction, but the present invention is not limited to this and may have other shapes, sizes, positions, and numbers. In short, in each pair of joints 1, the interlocking convex portions 122, 222 and the interlocking concave portions 123, 223 are formed so that at least one of the shapes, sizes, positions, and numbers is different from each other, so that the male member 10 and the female member 20 of the correct pair can be correctly connected, but the male member 10 and the female member 20 of the incorrect pair cannot be correctly connected.

[0049] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0050] 1(1a, 1b, 1c)...Joint 10 (10a, 10b, 10c)...Male member 11 (11a, 11b, 11c)... Male member main body 111(111a, 111b, 111c)…Slanted surface 112 (112a, 112b, 112c)...sealing member 12 (12a, 12b, 12c)...Male member side peripheral wall part 121 (121a, 121b, 121c)...Surrounding wall body 122 (122a, 122b, 122c)...occlusal convex portion 123 (123a, 123b, 123c)...occlusal recess 124 (124a, 124b, 124c)...Engagement convex part 20 (20a, 20b, 20c)...female member 21 (21a, 21b, 21c)...Female member body 211 (211a, 211b, 211c)...engagement recess 22 (22a, 22b, 22c)...Female member side peripheral wall part 221 (221a, 221b, 221c)...Surrounding wall body 222 (222a, 222b, 222c)...occlusal convex portion 223 (223a, 223b, 223c)...occlusal recess 23 (23a, 23b, 23c)...Hanging member 231 (231a, 231b, 231c)...first hook part 232 (232a, 232b, 232c)...Second hook part 233 (233a, 233b, 233c)...Threaded part P1, P2...flow path C1, C2…Tube H1, H2: Cover parts

Claims

1. A medical joint consisting of a male member and a female member that are connected to each other, The male member includes a male member main body having a flow path therein, and a male member side peripheral wall portion provided around the male member main body, The female member includes a female member main body having a flow path therein, and a female member side peripheral wall portion provided around the female member main body, The male member side peripheral wall portion and the female member side peripheral wall portion have a plurality of interlocking projections and interlocking recesses formed alternately at their tip portions along a circumferential direction, When the male member and the female member are connected, the male member main body and the female member main body are fitted together, and the mating convex portion and the mating concave portion of the male member side peripheral wall portion and the female member side peripheral wall portion are mated with each other, a predetermined space is provided between the engaging protrusion of the male member side peripheral wall portion and the male member main body, and when the male member and the female member are connected, the female member main body of the female member is fitted into the space between the engaging protrusion of the male member side peripheral wall portion and the male member main body, and the engaging protrusion of the male member side peripheral wall portion supports the outer circumferential surface of the female member main body from the radial direction, The engaging protrusion of the male member side peripheral wall portion has an engaging protrusion formed on the inner peripheral surface thereof, The female member main body has an engagement recess formed on its outer circumferential surface, A joint characterized in that, when the male member and the female member are connected, an engaging protrusion on the peripheral wall of the male member and an engaging recess on the main body of the female member engage with each other.

2. 2. The joint according to claim 1, wherein the male member main body is formed to a height such that it protrudes in the axial direction beyond the mating convex portion of the male member side peripheral wall portion.

3. 3. A joint according to claim 1, wherein the engaging convex portion of the female member side peripheral wall portion is provided at a position that abuts against the outer peripheral surface of the female member main body when the male member and the female member are connected.

4. A joint set including a plurality of joints according to claim 1 or 3, Each pair of couplings is formed so that at least one of the shape, size, position, and number of the mating convex portions and mating concave portions of the male member side peripheral wall portion and the female member side peripheral wall portion is different from the others.

5. 5. The fitting set according to claim 4, wherein the male member side peripheral wall portion and the female member side peripheral wall portion of each pair of fittings are colored the same color, and the colors of the fittings in each pair are different from each other.

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