JP2022057330A - Cap and joint with cap - Google Patents

Abstract

To provide a cap which is prevented from being removed from a joint by an external force applied to the joint.SOLUTION: A cap 50 for a joint 10 includes: an inner cylinder part 13; and an outer cylinder part 21 coaxially disposed at the radial outer side of the inner cylinder part 13. The cap 50 includes: a base material 51 having a support surface 51a; and protruding parts 61 which protrude from the support surface 51a to the first side in an axis O direction intersecting with the support surface 51a and disposed around an axis O at internals.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cap and a capped joint.

Conventionally, a joint for preventing water leakage due to insufficient insertion of a pipe has been studied. For example, the joint disclosed in Patent Document 1 has a built-in colored guide ring (annular member). When the pipe is not inserted in the fitting, the guide ring cannot be seen from the outside of the fitting. When the pipe has been inserted into the fitting, the guide ring will be visible from the outside of the fitting. Therefore, it is known that the insertion of the tube is completed.

On the other hand, although it is a joint not provided with a guide ring as in Patent Document 2, a joint used by attaching a cap is known. The joint includes a cylindrical core portion (inner cylinder portion) and a lid member (outer cylinder portion) coaxially arranged on the outer side in the radial direction of the cylindrical core portion. The annular protrusion of the cap is fitted into a pipe insertion slot formed between the cylindrical core and the lid member.
The cap is used for dustproofing the pipe insertion port.

Japanese Unexamined Patent Publication No. 2018-119619 Japanese Unexamined Patent Publication No. 2012-117555

However, when an external force such as an impact force acts on the joint, the lid member or the like of the joint may be deformed and the cap may come off from the cylindrical core portion and the lid member.

The present invention has been made in view of such problems, and an object of the present invention is to provide a cap that prevents the joint from coming off due to an external force applied to the joint, and a joint with a cap provided with the cap. do.

In order to solve the above problems, the present invention proposes the following means.
The cap of the present invention is a cap for a joint including an inner cylinder portion and an outer cylinder portion coaxially arranged on the outer side in the radial direction of the inner cylinder portion, and has a base material having a support surface and the above-mentioned. It is characterized by having a plurality of protrusions that project from the support surface toward the first side in the axial direction intersecting the support surface and are arranged at intervals around the axis.

According to the present invention, for example, a plurality of protruding portions are inserted between the inner cylinder portion and the outer cylinder portion of the joint, and the axes of the inner cylinder portion and the outer cylinder portion are inserted into at least one of the inner cylinder portion and the outer cylinder portion. The support surface of the base material is brought into contact with the support surface from the second side in the direction. At this time, the cap is attached to the joint whose dimensions of the inner cylinder and the outer cylinder are adjusted so that at least a part of the plurality of protrusions comes into contact with the outer peripheral surface of the inner cylinder from the outside in the radial direction. Install. When the plurality of protrusions are separated radially inward from the inner peripheral surface of the outer cylinder portion, a gap is formed over the entire circumference between the outer cylinder portion and the plurality of protrusions. On the other hand, when at least a part of the plurality of protrusions comes into contact with the inner peripheral surface of the outer cylinder portion from the inside in the radial direction, the portion between the outer cylinder portion and the plurality of protrusions in the circumferential direction. A gap is formed in.
Here, when an external force acts on the joint with the cap attached, the outer cylinder portion is deformed. However, by locating the deformed outer cylinder portion in this gap, it is possible to prevent the deformed outer cylinder portion from coming into contact with the plurality of protruding portions. At this time, at least a part of the plurality of protruding portions can easily maintain the state of holding the inner cylinder portion. Therefore, it is possible to prevent the cap from coming off the joint due to the external force applied to the joint.

Further, the cap may be provided with a connecting portion for connecting the plurality of protruding portions to each other.
According to the present invention, the rigidity of the plurality of protrusions can be increased by connecting the plurality of protrusions to each other by the connecting portion. Therefore, even if the deformed outer cylinder portion comes into contact with the plurality of protrusions, the plurality of protrusions are less likely to be deformed, and at least a part of the plurality of protrusions maintains the state of holding the inner cylinder portion. Cheap. Therefore, it is possible to more reliably prevent the cap from coming off the joint due to the external force applied to the joint.

Further, in the cap, the plurality of projecting portions may project radially outward from the connecting portion.
According to the present invention, the gap is likely to be formed between the protrusions adjacent to each other in the circumferential direction and the outer cylinder portion. Therefore, it is possible to prevent the cap from coming off from the joint due to an external force applied to the joint in a state where the rigidity of the plurality of protrusions is increased by the connecting portion.

Further, in the cap, the plurality of projecting portions may project radially inward from the connecting portion.
According to the present invention, it is possible to prevent the connecting portion from coming into contact with the outer peripheral surface of the inner cylinder portion from the outside in the radial direction. Therefore, when the cap is attached to the joint, it is possible to prevent the cap from coming off from the joint due to an external force applied to the joint while suppressing the friction generated between the connecting portion and the inner cylinder portion.

Further, in the cap, the plurality of protrusions include a plurality of first protrusions and a plurality of second protrusions, and the plurality of radial inner edges of the plurality of second protrusions. The first protrusion may protrude inward in the radial direction from the inner edge in the radial direction.
According to the present invention, only a plurality of second protrusions among the plurality of first protrusions and the plurality of second protrusions constituting the plurality of protrusions are in contact with the outer peripheral surface of the inner cylinder portion from the outside in the radial direction. Can be made to. This makes it possible to reduce the friction generated between the plurality of protrusions and the inner cylinder portion that occurs when the cap is attached to the joint.

Further, in the cap, the second protruding portions adjacent to each other in the circumferential direction may be arranged with the first protruding portion interposed therebetween.
According to the present invention, the plurality of second protrusions can stably hold the inner cylinder portion more evenly in the circumferential direction.

Further, the cap includes a first protruding portion and a second protruding portion as the plurality of protruding portions, and the first protruding portion and the second protruding portion are alternately arranged in the circumferential direction, and the first protruding portion is provided. The first protrusion does not protrude inward in the radial direction from the connecting portion, but protrudes only outward in the radial direction, and the second protruding portion does not protrude outward in the radial direction from the connecting portion. It may protrude only inward in the radial direction.
According to the present invention, only the second protruding portion constituting the plurality of protruding portions can be brought into contact with the outer peripheral surface of the inner cylinder portion of the joint from the outside in the radial direction. On the other hand, the deformed outer cylinder portion comes into contact with the first protruding portion, but even if the first protruding portion is deformed inward in the radial direction, the first protruding portion does not protrude inward in the radial direction from the connecting portion. Therefore, the first protruding portion is less likely to come into contact with the inner cylinder portion, and the deformed outer cylinder portion is less likely to come into contact with the second protruding portion than the first protruding portion, so that the second protruding portion holds the inner cylinder portion. Easy to maintain state.
Therefore, it is possible to more reliably prevent the cap from coming off the joint due to the external force applied to the joint.

Further, in the cap, an inclined surface is formed on the inner edge in the radial direction at the end opposite to the base material in the two protrusions, as the distance from the base material increases. May be good.
According to the present invention, when the cap is attached to the joint, the inclined surface of the second protruding portion is brought into contact with the outer peripheral surface of the inner cylinder portion. As a result, the plurality of second protrusions are guided between the inner cylinder portion and the outer cylinder portion, and the plurality of second protrusions can be easily inserted between the inner cylinder portion and the outer cylinder portion.

Further, the capped joint of the present invention includes the cap according to any one of the above and the joint, and the plurality of protruding portions are arranged between the inner cylinder portion and the outer cylinder portion, and the above-mentioned. At least a part of the plurality of protrusions is characterized in that it comes into contact with the outer peripheral surface of the inner cylinder portion from the outside in the radial direction.

According to the present invention, when a plurality of protrusions are arranged between the inner cylinder portion and the outer cylinder portion, the plurality of protrusions are separated inward in the radial direction from the inner peripheral surface of the outer cylinder portion. If so, a gap is formed over the entire circumference between the outer cylinder portion and the plurality of protruding portions. On the other hand, when at least a part of the plurality of protrusions comes into contact with the inner peripheral surface of the outer cylinder portion from the inside in the radial direction, the portion between the outer cylinder portion and the plurality of protrusions in the circumferential direction. A gap is formed in.
Here, when an external force acts on the joint, the outer cylinder portion is deformed. However, by locating the deformed outer cylinder portion in this gap, it is possible to prevent the deformed outer cylinder portion from coming into contact with the plurality of protruding portions. At this time, at least a part of the plurality of protruding portions can easily maintain the state of holding the inner cylinder portion. Therefore, it is possible to prevent the cap from coming off the joint due to the external force applied to the joint.

Further, in the capped joint, the joint includes an annular member coaxially arranged between the inner cylinder portion and the outer cylinder portion, and the support surface of the base material is formed on the inner cylinder portion and the outer cylinder portion. When the inner cylinder portion and the outer cylinder portion are in contact with at least one of the outer cylinder portions from the second side in the axial direction, the plurality of protruding portions are the first in the axial direction facing the annular member. It may extend to the vicinity of the 2nd side.
According to the present invention, it is difficult for the annular member to move to the second side in the axial direction due to the plurality of protrusions. Therefore, it is possible to prevent the annular member from jumping out to the second side in the axial direction from between the inner cylinder portion and the outer cylinder portion by the plurality of projecting portions.

According to the cap and the joint with a cap of the present invention, it is possible to prevent the joint from coming off due to an external force applied to the joint.

It is sectional drawing of the joint with a cap of one Embodiment of this invention. It is sectional drawing of the pipe apparatus which uses the joint of the joint with the same cap. It is sectional drawing of the cap of the joint with the cap. It is a front view of the cap. It is a front view of the cap in the 1st modification of one Embodiment of this invention. It is a front view of the cap in the 2nd modification of one Embodiment of this invention. It is a front view of the cap in the 3rd modification of one Embodiment of this invention.

Hereinafter, an embodiment of the capped joint according to the present invention will be described with reference to FIGS. 1 to 7.
As shown in FIG. 1, the capped joint 1 of the present embodiment includes a joint 10 and a cap 50 of the present embodiment. As shown in FIG. 2, the joint 10 is connected to the first pipe 100A and the second pipe 100B. The pipe device 2 is composed of the joint 10 and the pipes 100A and 100B. The pipe device 2 constitutes various piping equipment such as a water supply pipe, a drain pipe (sewage pipe), a gas pipe, and an air conditioning pipe (not shown). The main piping location of the pipe device 2 is a dark place or a narrow place such as under the floor of a building.

FIG. 1 shows a connection incomplete state in which the second pipe 100B is not connected to the joint 10. As shown in FIG. 1, the joint 10 includes a joint main body 11, a body (outer cylinder portion) 21, a retaining member 31, and a guide ring (annular member) 41.
Here, the joint body 11 and the body 21 are formed in a tubular shape, and the retaining member 31 and the guide ring 41 are formed in an annular shape. The central axes of the joint body 11, the body 21, the retaining member 31, and the guide ring 41 are arranged coaxially with the common axis. In the following, the common axis will be referred to as axis O. The direction along the axis O is called the axis O direction. The direction orthogonal to the axis O is called the radial direction, and the direction orbiting around the axis O is called the circumferential direction.

The joint body 11 includes a first connection portion 12 and a second connection portion (inner cylinder portion) 13. These connecting portions 12 and 13 are each formed in a cylindrical shape. The connecting portions 12 and 13 are arranged coaxially with the axis O and are connected in a row along the axis O direction. In the following, in the axis O direction, the first connection portion 12 side with respect to the second connection portion 13 is referred to as the tip end side, and the second connection portion 13 side with respect to the first connection portion 12 is referred to as the proximal end side. The base end side is the side opposite to the tip end side in the axis O direction.
For example, the connecting portions 12 and 13 are made of metal such as gunmetal. A male screw 12a is formed on the outer peripheral surface of the first connecting portion 12.
The second connection portion 13 is longer than the first connection portion 12 and has a smaller outer diameter than the first connection portion 12. A plurality of grooves 13a are formed on the outer peripheral surface of the second connecting portion 13. The plurality of grooves 13a are formed so as to be spaced apart from each other in the axis O direction. A sealing member 14 such as an O-ring is arranged in each groove 13a. The seal member 14 projects radially outward from the groove 13a.
Here, the outer diameter of the base end portion of the second connecting portion 13 is defined as L1.

The body 21 is arranged coaxially with the second connecting portion 13 on the outer side in the radial direction of the second connecting portion 13. A gap is formed between the body 21 and the second connecting portion 13. This gap forms a tubular receiving portion S1.
The body 21 includes an outer body member 22, an inner body member 23, and a lock ring 24. The outer body member 22 is made of a transparent resin such as transparent nylon. The tip of the outer body member 22 is fixed to the outer peripheral surface of the tip of the second connecting portion 13.

The inner body member 23 is made of colored resin. The inner body member 23 is housed in a portion on the proximal end side inside the outer body member 22. The inner body member 23 includes an annular inner body main body 23a and a plurality of tapping portions 23b. Each tapping portion 23b is formed in a cantilever shape and extends from the inner body main body 23a toward the tip end side. The plurality of tapping portions 23b are arranged so as to be spaced apart from each other in the circumferential direction. The tip of each tapping portion 23b is provided with a tapping convex portion 23c so as to project inward in the radial direction.
In the axis O direction, the range in which the inner body member 23 is arranged is an invisible region R1 in which the inside of the inner body member 23 cannot be visually recognized from the outside of the joint 10. On the other hand, in the axis O direction, a predetermined range on the tip side of the inner body member 23 is a see-through region R2 in which the inside of the outer body member 22 can be visually recognized from the outside of the joint 10 through the outer body member 22.
A cylindrical lock ring 24 is fitted to the base end portion of the outer body member 22. Here, the inner diameter of the lock ring 24 is defined as L2.

The retaining member 31 includes an annular flange portion 32 and a retaining portion 33. The flange portion 32 is fixed by being sandwiched between the body members 22 and 23 and the lock ring 24.
The retaining portion 33 is integrally formed on the inner peripheral edge of the flange portion 32. The retaining portion 33 is formed in a tapered shape whose diameter decreases toward the tip end side from the flange portion 32.

The guide ring 41 is arranged coaxially with the second connecting portion 13 and the body 21 between the second connecting portion 13 and the body 21 of the joint 10. The guide ring 41 includes a movable main body portion 42 and a guide portion 43. The movable main body portion 42 is formed in an annular shape. An annular guide portion 43 is provided on the tip surface of the movable main body portion 42. The guide portion 43 includes a guide surface 43a and a step 43b. The cross section of the guide portion 43 in a plane including the axis O is wedge-shaped. The outer peripheral surface of the guide portion 43 constitutes the guide surface 43a. The guide surface 43a is formed in a tapered shape whose diameter increases toward the proximal end side. The outer diameter of the base end portion on the guide surface 43a is larger than the outer diameter of the movable main body portion 42. A step 43b is formed between the guide surface 43a and the outer peripheral surface of the movable main body portion 42.
The guide ring 41 is slidable in the axis O direction in the receiving portion S1.
When the joint 10 is in an incomplete connection state, the guide ring 41 is arranged in the non-transparent region R1.

The procedure for connecting the pipes 100A and 100B to the joint 10 will be described as described above.
First, as shown in FIG. 2, the first pipe 100A is screwed into and connected to the male screw 12a of the first connecting portion 12 of the joint 10.
Next, the second pipe 100B is inserted into the receiving portion S1 of the joint 10. Then, the second pipe 100B is inserted into the retaining member 31. Since the retaining portion 33 is locked to the outer peripheral surface of the second pipe 100B, the second pipe 100B cannot be pulled out. The end of the second pipe 100B abuts on the guide ring 41. With the insertion of the second pipe 100B, the guide ring 41 is pushed and moved toward the tip side.

Eventually, the guide surface 43a of the guide ring 41 hits the tapping convex portion 23c, and the tapping portion 23b is elastically deformed so as to warp outward in the radial direction.
As shown in FIG. 2, when the second pipe 100B is inserted to the normal connection position, the tapping convex portion 23c gets over the guide portion 43 and vigorously returns elastically inward in the radial direction. At this time, the tapping convex portion 23c strikes the movable main body portion 42, so that a clicking sound is generated. By listening to this, it can be confirmed that the second pipe 100B has reached the normal connection position (normal connection state).

Moreover, in the normal connection state, the guide ring 41 is arranged in the see-through region R2 so that the guide ring 41 can be visually recognized.
Therefore, it can be reliably determined whether the second pipe 100B is in the normal connection state or the connection incomplete state depending on whether or not the guide ring 41 can be seen.
Next, the cap 50 will be described.

The cap 50 shown in FIGS. 3 and 4 is a dustproof cap at the base end of the joint 10. For example, the cap 50 is formed by injection molding. This example shows the case where the cap 50 has a draft for injection molding.
The cap 50 includes a substrate (base material) 51, a plurality of projecting portions 61, and a connecting portion 66.
In this embodiment, the substrate 51 is formed in a disk shape. The substrate 51 has a first surface (support surface) 51a. In the present embodiment, the first surface 51a is an outer surface on one side of the substrate 51 in the thickness direction. The substrate 51 is arranged so that the axis orthogonal to the first surface 51a coincides with the axis O (see FIG. 1). The axis of the substrate 51 may intersect the first surface 51a. The first surface 51a is an outer surface of the substrate 51 on the tip end side (first side in the axial direction).
A first recess 52 is formed on the second surface 51b, which is the outer surface of the substrate 51 on the base end side (second side in the axial direction). The first recess 52 is formed over a region other than the outer edge portion of the second surface 51b. A second recess 53 is formed at the center of the bottom surface of the first recess 52. The second recess 53 is formed on the axis O.
A protrusion 54 projecting toward the tip end is formed on the first surface 51a of the substrate 51. The protrusion 54 is formed at a position corresponding to the second recess 53.

The plurality of projecting portions 61 project from the substrate 51 toward the tip end side, respectively. Each protrusion 61 is formed in a columnar shape. The plurality of protrusions 61 are arranged around the axis O at intervals from each other. The number of the plurality of protrusions 61 is preferably 3 or more and 20 or less.
In the present embodiment, as the plurality of projecting portions 61, a plurality of first projecting portions 62 and a plurality of second projecting portions 63 are provided. The shape of the first protruding portion 62 and the shape of the second protruding portion 63 are the same as each other except for the inclined surface 63c described later.

The plurality of second protrusions 63 are respectively arranged inside the plurality of first protrusions 62 in the radial direction. As shown in FIG. 4, the radial inner edge 63a of the plurality of second protrusions 63 projects radially inward from the radial inner edge 62a of the plurality of first protrusions 62, respectively. ing. That is, when the plurality of first protrusions 62 and the plurality of second protrusions 63 are arranged at the same positions in the circumferential direction, the edge portions 63a of the plurality of second protrusions 63 are the edges of the plurality of first protrusions 62. Each of the portions protrudes inward in the radial direction from the portion 62a.
The radial outer edge portion 62b of the plurality of first protrusions 62 projects radially outward from the radial outer edge portion 63b of the plurality of second protrusions 63, respectively. That is, when the plurality of first protrusions 62 and the plurality of second protrusions 63 are arranged at the same positions in the circumferential direction, the edge portions 62b of the plurality of first protrusions 62 are the edges of the plurality of second protrusions 63. Each of the portions protrudes outward in the radial direction from the portion 63b.
FIG. 4 shows the circumscribed circle C1 of the plurality of first protrusions 62 and the inscribed circle C2 of the plurality of second protrusions 63, respectively. The diameter of the circumscribed circle C1 is defined as L4. The diameter of the inscribed circle C2 is defined as L5.

As shown in FIGS. 3 and 4, an inclined surface 63c is formed on the inner edge in the radial direction at the end (tip portion) of the plurality of second protrusions 63 opposite to the substrate 51. The inclined surface 63c is formed so as to be separated from the axis O as it is separated from the substrate 51.
As shown in FIG. 4, the second protruding portions 63 adjacent to each other in the circumferential direction are arranged with the first protruding portion 62 interposed therebetween. In this example, two first protrusions 62 are sandwiched between the second protrusions 63 adjacent to each other in the circumferential direction. The number of the first protruding portions 62 sandwiched between the second protruding portions 63 adjacent to each other in the circumferential direction may be one or three or more. When the number of the first protrusions 62 sandwiched between the second protrusions 63 adjacent to each other in the circumferential direction is one, the first protrusions 62 and the second protrusions 63 are arranged alternately in the circumferential direction. Will be done.

The connecting portion 66 connects a plurality of protruding portions 61 to each other. The connecting portion 66 includes a plurality of connecting pieces 67. Each connecting piece 67 is arranged between the protrusions 61 adjacent to each other in the circumferential direction. Each connecting piece 67 is curved so as to be convex toward the outside in the radial direction. Each connecting piece 67 connects the protruding portions 61 adjacent to each other in the circumferential direction.
The plurality of projecting portions 61 project radially outward from the plurality of connecting pieces 67 (connecting portions 66). The plurality of projecting portions 61 project radially inward from the plurality of connecting pieces 67.
The thickness (diameter length) of the connecting portion 66 is preferably 1 mm or more. When the thickness of the connecting portion 66 is 1 mm or more, the cap 50 can be easily manufactured by injection molding, and the rigidity of the plurality of protruding portions 61 can be easily improved. The maximum value of the thickness of the connecting portion 66 is a value obtained by the formula ((L4-L5) / 2). If the thickness of the connecting portion 66 is reduced to some extent, sink marks are less likely to occur in the connecting portion 66 when the cap 50 is manufactured by injection molding.
In FIG. 4, the line 67a on the base end side of the connecting piece 67 due to the draft is visible.
The substrate 51, the plurality of projecting portions 61, and the connecting portion 66 are integrally formed by injection molding using a synthetic resin.

The cap 50 configured as described above is attached to the joint 10 as follows. The cap 50 is used when the joint 10 is stored or the like.
As shown in FIG. 1, the plurality of projecting portions 61 are arranged between the second connecting portion 13 and the body 21. The first surface 51a of the substrate 51 is in contact with the body 21 (lock ring 24) from the base end side of the body 21.
The plurality of second protrusions 63 (at least a part of the plurality of protrusions 61) are in contact with the outer peripheral surface of the second connection portion 13 from the outside in the radial direction. In order to make such contact, the diameter L5 of the inscribed circle C2 of the plurality of second protruding portions 63 is made equal to the outer diameter L1 of the base end portion of the second connecting portion 13.
The plurality of protrusions 61 are separated radially inward from the inner peripheral surface of the body 21. In this case, a gap S2 is formed between the body 21 and the plurality of protrusions 61 over the entire circumference. In order to form this gap S2, the diameter L4 of the circumscribed circles C1 of the plurality of first protrusions 62 is made smaller than the inner diameter L2 of the lock ring 24.
When the substrate 51 comes into contact with the body 21, the plurality of protrusions 61 face the guide ring 41. It is preferable that the plurality of projecting portions 61 extend to the vicinity of the proximal end side with respect to the guide ring 41.

The first surface 51a of the substrate 51 may come into contact with the second connecting portion 13 from the base end side of the second connecting portion 13, or the body 21 and the second connecting portion 13 may be in contact with the body 21 and the second connecting portion 13, respectively. Contact may be made from the base end side of each of the connection portions 13.

As described above, according to the cap 50 of the present embodiment, a plurality of protruding portions 61 are inserted between the second connecting portion 13 of the joint 10 and the body 21, and the base end side of the body 21 is inserted into the body 21. The first surface 51a of the substrate 51 is brought into contact with the substrate 51. At this time, with respect to the joint 10 whose dimensions of the body 21 and the second connecting portion 13 are adjusted so that the plurality of second protruding portions 63 come into contact with the outer peripheral surface of the second connecting portion 13 from the outside in the radial direction. , Attach the cap 50.
Here, when an external force acts on the joint 10 with the cap 50 attached, the body 21 is deformed. However, by locating the deformed body 21 in the gap S2, it is possible to prevent the deformed body 21 from coming into contact with the plurality of protrusions 61. At this time, the plurality of second protruding portions 63 can easily maintain the state of holding the second connecting portion 13. Therefore, it is possible to prevent the cap 50 from coming off from the joint 10 due to the external force applied to the joint 10.

The cap 50 includes a connecting portion 66. By connecting the plurality of projecting portions 61 to each other by the connecting portion 66, the rigidity of the plurality of projecting portions 61 can be increased. Therefore, even if the deformed body 21 comes into contact with the plurality of projecting portions 61, the plurality of projecting portions 61 are less likely to be deformed, and the plurality of second projecting portions 63 maintain the state of holding the second connecting portion 13. It's easy to do. Therefore, it is possible to more reliably prevent the cap 50 from coming off from the joint 10 due to the external force applied to the joint 10.
The plurality of projecting portions 61 project radially outward from the connecting portion 66, respectively. Therefore, it is easy to form a gap S2 between the projecting portions 61 adjacent to each other in the circumferential direction and the body 21. Therefore, it is possible to prevent the cap 50 from coming off from the joint 10 due to an external force applied to the joint 10 in a state where the rigidity of the plurality of protruding portions 61 is increased by the connecting portion 66.

The plurality of projecting portions 61 project radially inward from the connecting portion 66, respectively. Therefore, it is possible to prevent the connecting portion 66 from coming into contact with the outer peripheral surface of the second connecting portion 13 from the outside in the radial direction. Therefore, when the cap 50 is attached to the joint 10, the cap 50 is detached from the joint 10 by an external force applied to the joint 10 while suppressing the friction generated between the connecting portion 66 and the second connecting portion 13. Can be prevented.
As the plurality of protrusions 61, a plurality of first protrusions 62 and a plurality of second protrusions 63 are provided. The radial inner edge portion 63a of the plurality of second protrusions 63 projects radially inward from the radial inner edge portion 62a of the plurality of first protrusions 62, respectively. As a result, only the plurality of second protrusions 63 among the plurality of first protrusions 62 and the plurality of second protrusions 63 constituting the plurality of protrusions 61 are radially aligned with the outer peripheral surface of the second connection portion 13. It can be contacted from the outside. As a result, it is possible to reduce the friction generated between the plurality of projecting portions 61 and the second connecting portion 13 that occurs when the cap 50 is attached to the joint 10.

The second protruding portions 63 adjacent to each other in the circumferential direction are arranged with the first protruding portion 62 interposed therebetween. Therefore, the plurality of second protruding portions 63 can stably hold the second connecting portion 13 more evenly in the circumferential direction.
An inclined surface 63c is formed on the second protruding portion 63. When the cap 50 is attached to the joint 10, the inclined surface 63c of the second protruding portion 63 is brought into contact with the outer peripheral surface of the second connecting portion 13. As a result, the plurality of second protrusions 63 are guided between the second connection portion 13 and the body 21, and the plurality of second protrusions 63 can be easily inserted between the second connection portion 13 and the body 21. be able to.

Further, according to the capped joint 1 of the present embodiment, when an external force acts on the joint 10, the body 21 is deformed. However, by locating the deformed body 21 in the gap S2, it is possible to prevent the deformed body 21 from coming into contact with the plurality of protrusions 61. At this time, the plurality of second protruding portions 63 can easily maintain the state of holding the second connecting portion 13. Therefore, it is possible to prevent the cap 50 from coming off from the joint 10 due to the external force applied to the joint 10.
The joint 10 includes a guide ring 41, and the plurality of protrusions 61 extend to the vicinity of the proximal end side with respect to the guide ring 41. Therefore, it is difficult for the guide ring 41 to move to the proximal end side due to the plurality of protrusions 61. Therefore, the plurality of projecting portions 61 can prevent the guide ring 41 from protruding toward the proximal end side from between the second connecting portion 13 and the body 21.

Here, as shown in FIG. 1, the distance between the step 43b of the retaining member 31 and the retaining member 31 in the axis O direction is defined as L7. The distance between the guide ring 41 and the plurality of protrusions 61 is defined as L8.
It is preferable to hold the guide ring 41 with a plurality of protrusions 61 so that the guide ring 41 does not come into contact with the retaining member 31. Therefore, the distance L7 is preferably longer than the distance L8. However, the distance L8 is preferably longer than 0 so that the guide ring 41 is not pushed by the plurality of protrusions 61. Since the plurality of protrusions 61 extend to the vicinity of the proximal end side with respect to the guide ring 41 as described above, for example, the distance L8 is longer than 0 and the diameter of the seal member 14 (the length of the seal member 14 in the axis O direction). It is preferable that it is as follows.

When the cap 50 is attached to the joint 10, the plurality of first protrusions 62 may come into contact with the inner peripheral surface of the body 21 from the inside in the radial direction. In this case, a gap is formed between the body 21 and the plurality of projecting portions 61 in a part in the circumferential direction.

Unlike the cap 50A of the first modification shown in FIG. 5, a draft may not be formed in the connecting portion 66.
The connecting portion 66A may be formed thick as in the cap 50B of the second modification shown in FIG. In this second modification, the outer peripheral edge of the connecting portion 66A coincides with the circumscribed circles C1 of the plurality of first protruding portions 62.
Even if these caps 50A and 50B are used, the same effect as that of the cap 50 of the present embodiment can be obtained.

The cap 50C of the third modification shown in FIG. 7 includes a first protruding portion 72 and a second protruding portion 73 as a plurality of protruding portions 71. In this third modification, the first protruding portion 72 and the second protruding portion 73 are alternately arranged in the circumferential direction.
The first protruding portion 72 does not protrude inward in the radial direction from the connecting portion 66 (connecting piece 67), but protrudes only in the outward direction in the radial direction. The second protruding portion 73 does not protrude outward from the connecting portion 66 in the radial direction, but protrudes only inward in the radial direction.
The second protruding portion 73 is formed with an inclined surface 73a similar to the inclined surface 63c of the second protruding portion 63 of the present embodiment.
The first protruding portion 72 and the second protruding portion 73 may not be arranged alternately in the circumferential direction. The inclined surface 73a may not be formed on the second protruding portion 73. The formal protruding portion that does not abut on the receiving port (second connecting portion 13 and body 21) of the joint 10 is radially opposite to the side on which each of the first and second protruding portions 72 and 73 protrudes. It may be provided on the side.

According to the cap 50C of the third modification, only the second protruding portion 73 constituting the plurality of protruding portions 71 can be brought into contact with the outer peripheral surface of the second connecting portion 13 in the joint 10 from the outside in the radial direction. On the other hand, the deformed body 21 comes into contact with the first protruding portion 72, but even if the first protruding portion 72 is deformed inward in the radial direction, the first protruding portion 72 is radially inward from the connecting portion 66. The second protruding portion 72 is less likely to come into contact with the second connecting portion 13 because the first protruding portion 72 is not protruding, and the deformed body 21 is less likely to come into contact with the second protruding portion 73 than the first protruding portion 72. It is easy to maintain the state in which 73 holds the second connection portion 13.
Therefore, it is possible to more reliably prevent the cap 50C from coming off from the joint 10 due to the external force applied to the joint 10.
The draft may be formed on each of the plurality of projecting portions 71 and the connecting portion 66.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the configuration is changed, combined, or deleted without departing from the gist of the present invention. Etc. are also included.
For example, in the above embodiment, the plurality of second protrusions 63 may be arranged side by side in the circumferential direction without sandwiching the first protrusion 62 between them. The same applies to the plurality of first protrusions 62.
The inclined surface 63c may not be formed on the second protruding portion 63.
The radial inner edge portion 63a of the plurality of second protrusions 63 and the radial inner edge portion 62a of the plurality of first protrusions 62 may be arranged at the same position in the radial direction. The radial outer edge 62b of the plurality of first protrusions 62 and the radial outer edge 63b of the plurality of second protrusions 63 may be arranged at the same position in the radial direction.

The base material is a substrate 51 formed in a disk shape. However, the shape of the base material is not limited to this as long as the support surface is formed. For example, the base material may have a block shape (rectangular parallelepiped shape) or the like on which a support surface is formed.
The joint 10 does not have to include the guide ring 41. The cap 50 does not have to include the protrusion 54 and the connecting portion 66.

1 Fitting with cap 10 Fitting 13 Second connection (inner cylinder)
21 Body (outer cylinder)
41 Guide ring (annular member)
50, 50A, 50B, 50C Cap 51 Substrate (base material)
51a First surface (support surface)
61, 71 Protruding parts 62,72 First protruding parts 62a, 62b, 63a, 63b Edges 63, 73 Second protruding parts 63c, 73a Inclined surface 66 Connecting part O Axis line

Claims (10)

A cap for a joint including an inner cylinder portion and an outer cylinder portion coaxially arranged on the outer side in the radial direction of the inner cylinder portion.
A base material with a support surface and
A plurality of protrusions that project from the support surface toward the first side in the axial direction intersecting the support surface and are arranged at intervals around the axis.
Cap with. The cap according to claim 1, further comprising a connecting portion for connecting the plurality of protruding portions to each other. The cap according to claim 2, wherein the plurality of protrusions each protrude outward in the radial direction from the connecting portion. The cap according to claim 2 or 3, wherein the plurality of projecting portions project inward in the radial direction from the connecting portion, respectively. As the plurality of protrusions, a plurality of first protrusions and a plurality of second protrusions are provided.
Any of claims 1 to 4, wherein the radial inner edges of the plurality of second protrusions each project radially inward from the radial inner edges of the plurality of first protrusions. The cap described in item 1. The cap according to claim 5, wherein the second protrusions adjacent to each other in the circumferential direction are arranged with the first protrusions interposed therebetween. As the plurality of protrusions, a first protrusion and a second protrusion are provided.
The first protruding portion does not protrude inward in the radial direction from the connecting portion, but protrudes only in the outward direction in the radial direction.
The cap according to claim 2, wherein the second protruding portion does not protrude outward in the radial direction from the connecting portion, but protrudes only inward in the radial direction. Claims 5 to 7 have an inclined surface formed on the inner edge in the radial direction at the end opposite to the base material in the second protruding portion so as to be separated from the axis as it is separated from the base material. The cap described in any one of the items. The cap according to any one of claims 1 to 8 and
With the joint
Equipped with
The plurality of protrusions are arranged between the inner cylinder portion and the outer cylinder portion.
At least a part of the plurality of protrusions is a joint with a cap that contacts the outer peripheral surface of the inner cylinder portion from the outside in the radial direction. The joint includes an annular member coaxially arranged between the inner cylinder portion and the outer cylinder portion.
When the support surface of the base material contacts at least one of the inner cylinder portion and the outer cylinder portion from the second side in the axial direction with respect to the inner cylinder portion and the outer cylinder portion, the plurality of protrusions. The joint with a cap according to claim 9, wherein the portion is opposed to the annular member.

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