Attachments and attachments with caps

Abstract

This technology enables the reuse of caps and facilitates easy sorting during disposal. [Solution] The attachment 1 of the present invention is an attachment to which a magnet 10 can be attached and detached, and comprises a cylindrical portion 30 to which a cap 20 can be attached, a movable holding means 40 that can be reversed with the inner surface of the cylindrical portion 30 as the reversal center Ci, from a holding state S2 inclined toward the opposite side of the side to which the cap 20 is attached and holding the magnet 10, to a detachment state S3 inclined toward the side to which the cap 20 is attached and detaching the magnet 10, and a support means 50 that can support the magnet 10 from the opposite side of the side to which the cap 20 is attached.

Description

Technical Field

[0001] The present invention relates to an attachment and an attachment with a cap.

Background Art

[0002] In recent years, from the perspective of CSR (Corporate Social Responsibility), efforts for environmental consideration have been demanded. In such a situation, it is important to collect and reuse the caps used for beverage containers. However, reusing caps for beverage containers is difficult from the perspective of hygiene.

[0003] For example, Patent Document 1 describes a display tool that can utilize the cap of a plastic bottle with a specific design to realize various designs and expressions, and can effectively utilize the cap of the plastic bottle. Specifically, Patent Document 1 describes a cap of a plastic bottle having a screw portion on the inner surface, and a cylindrical member having a locking portion fitted and fixed to this screw portion on the outer periphery. A specific design is applied to the upper surface of the cap. The lower end of the cylindrical member has a flange with an outer diameter substantially the same as or slightly larger than the outer diameter of the cap. The bottom surface of the cylindrical member has a magnet that can be attached to and detached from a wall, a board, furniture, etc.

[0004] Also, Patent Document 2 describes that an object to be fixed such as a document can be fixed by the magnetic force of a magnet, and the cap for a liquid container provided with a label on the surface of the top plate portion can be reused. Specifically, Patent Document 2 describes a stopper characterized by including a stopper body having a locking portion locked inside the cap for a liquid container, and a magnet fixed to the stopper body.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

[0006] In conventional technologies as described above, there were environmental problems when disposing of attachments such as fasteners, as it was difficult to easily remove the magnets from the attachments and sort them for disposal.

[0007] In view of these circumstances, the object of the present invention is to provide a technology that enables the reuse of caps and facilitates easy sorting when disposing of them. [Means for solving the problem]

[0008] To solve the above problems, an attachment in one embodiment of the present invention comprises: (1) an attachment to which a magnet can be attached and detached, comprising: a cylindrical portion to which a cap can be attached; a movable holding means that can be reversed with respect to the inner surface of the cylindrical portion as the reversal center, from a holding state inclined toward the opposite side of the cap to hold the magnet, to a detachment state inclined toward the cap to release the magnet; and a supporting means capable of supporting the magnet from the opposite side of the cap to the cap to support the magnet.

[0009] Furthermore, in the attachment described in (1) above, (2) in the holding state, it is preferable that the movable holding means is pressed against the cap from the mounting side toward the opposite side by a projection extending from the inner surface of the cap.

[0010] Furthermore, in the attachment described in (1) or (2) above, (3) the movable holding means is preferably formed such that the base portion located on the inner surface side of the cylindrical portion is thinner than the tip portion located radially inward of the cylindrical portion than the base portion, and includes a movable piece that extends continuously or intermittently along the circumferential direction of the cylindrical portion.

[0011] Furthermore, in the attachment described in (3) above, it is preferable that (4) a flat surface is further formed on the tip portion so as to be aligned with the main surface of the magnet in the holding state.

[0012] Furthermore, in the attachment described in any one of (1) to (4) above, (5) the support means preferably includes a projection that protrudes radially inward from the cylindrical portion and extends continuously or intermittently along the circumferential direction of the cylindrical portion, and a hole for applying an external force to the magnet from the opposite side of the cap toward the mounting side when reversing from the holding state to the detached state is preferably formed radially inward from the support means from the cylindrical portion.

[0013] Furthermore, in the attachment described in any one of (1) to (5) above, (6) when reversing from the holding state to the detached state, it is preferable that a detachment relief portion is formed on the inner surface of the cylindrical portion on the side of the cap that is attached to the cap, which allows the movable holding means to be temporarily retracted radially outward from the reversal center of the cylindrical portion.

[0014] Furthermore, in the attachment described in any one of (1) to (6) above, (7) the movable retaining means is in a pre-attachment state inclined toward the attachment side of the cap before the magnet is attached, and when reversing from the pre-attachment state to the holding state, a relief portion for attachment is formed on the inner surface of the cylindrical portion on the side opposite to the cap from the reversal center, which allows the movable retaining means to be temporarily retracted radially inward of the cylindrical portion from the reversal center.

[0015] In addition, the attachment with a cap in one embodiment of the present invention is an attachment with a cap, comprising: (8) a cap; and an attachment to which the magnet according to any one of the above (1) to (7) is detachably attached, wherein a protrusion extending from the inner surface of the cap presses the movable holding means of the attachment from the mounting side of the cap toward the opposite side.

Advantages of the Invention

[0016] According to the present invention, it is possible to provide a technique that enables the reuse of the cap and facilitates separation at the time of disposal.

Brief Description of the Drawings

[0017] [Figure 1] It is a cross-sectional view passing through the central axis of the attachment with a cap, comprising the attachment according to one embodiment of the present invention. [Figure 2] It is a diagram for explaining the transition of the inversion of the movable holding means shown in FIG. 1. [Figure 3] It is a partially enlarged view of the α region shown in FIG. 1. [Figure 4] It is a top view of the attachment according to one embodiment of the present invention, seen from the mounting side of the cap. [Figure 5] It is a diagram for explaining a modified example of the movable piece in the attachment according to one embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments for preferably implementing the present invention will be described. In the description using the following figures, the X, Y, and Z directions are appropriately set, but these are definitions for convenience of explanation and do not unduly limit the present invention.

[0019] <1. Attachment> Referring to FIG. 1, the attachment 1 is configured to be detachable with the magnet 10. Further, the attachment 1 is configured to be able to mount the cap 20 and can be used as an attachment 2 with a cap. The attachment 1 includes at least a cylindrical portion 30, a movable holding means 40, and a support means 50.

[0020] Referring also to FIG. 2, the movable holding means 40 is configured to be reversible with the inner surface side of the cylindrical portion 30 as the reversal center Ci. Specifically, before the magnet 10 is mounted, the movable holding means 40 is in a pre-mounting state S1 that inclines toward the mounting side of the cap 20. At this time, a jig may be inserted before the magnet 10 is mounted and the movable holding means 40 may be bent in advance so as to change from an upward inclination to a downward inclination. Alternatively, the movable holding means 40 may be bent so as to change from an upward inclination to a downward inclination simultaneously with the mounting of the magnet 10. Subsequently, when the magnet 10 is held, the movable holding means 40 becomes a holding state S2 that inclines toward the side opposite to the mounting side of the cap 20. Subsequently, when the magnet 10 is detached, the movable holding means 40 becomes a detachment state S3 that inclines toward the mounting side of the cap 20. Therefore, the movable holding means 40 transitions in the order of the pre-mounting state S1, the holding state S2, and the detachment state S3 in response to a series of operations such as the mounting, holding, and detachment of the magnet 10. For the sake of easy understanding of the present invention, the mounting side of the cap 20 in the attachment 1 is defined as "up" for convenience, and the side opposite to the mounting side of the cap 20 is defined as "down" for convenience.

[0021] (Magnet) Referring to FIGS. 1 and 3, the magnet 10 has a shape that is detachable from the cylindrical portion 30. Specifically, the magnet 10 has a cylindrical shape with an outer diameter smaller than the inner diameter of the region in the cylindrical portion 30 where a magnet holding portion 34 described later is formed. The material of the magnet 10 is not particularly limited as long as it has a magnetic force capable of stopping documents or the like sandwiched between the attachment 1 and a metal plate or the like by magnetic adsorption.

[0022] (Cap) Referring to Figure 1, the cap 20 can be any known or arbitrary cap used for opening and closing beverage containers such as PET bottles. The cap 20 may be a synthetic resin cap molded into a desired shape by, for example, press molding or injection molding of synthetic resin, but the present invention is not limited thereto. In the example shown in Figure 1, the cap 20 includes at least a top surface portion 21 and a skirt wall 22.

[0023] The top surface portion 21 has, for example, a disc shape. A known or arbitrary inner ring 24 is formed on the back surface 23 of the top surface portion 21. The inner ring 24 is an example of a projection extending from the inner surface of the cap 20. However, the projection can be any part extending from the inner surface of the cap 20 and is not necessarily limited to the inner ring 24 shown in Figure 1. A known or arbitrary contact ring 25 is formed between the periphery of the top surface portion 21 and the inner ring 24 on the back surface 23 of the top surface portion 21.

[0024] The skirt wall 22 descends from the periphery of the top surface 21. The inner circumferential surface of the skirt wall 22 has threads 26 that can be screwed into the threaded portion 31 formed on the outer surface of the cylindrical portion 30, which will be described later. Note that the threads 26 can be of any known or arbitrary structure as long as they can be screwed into the threaded portion 31. However, the threads 26 are not an essential component for achieving the effects of the present invention. For example, an engaging portion may be formed on the outer surface of the cylindrical portion 30 instead of the threaded portion 31, and the cap 20 may be configured to fit into the engaging portion of the cylindrical portion 30 via an engaged portion such as a lug provided at its lower end.

[0025] (Cylindrical part) Referring to Figure 1, the cylindrical portion 30 is configured to be able to accommodate the cap 20. Specifically, the cylindrical portion 30 is hollow and has a cylindrical shape with an outer diameter smaller than the inner diameter of the cap 20. Preferably, a threaded portion 31 that can be screwed onto the threads 26 of the cap 20 is formed on the outer surface of the cylindrical portion 30. A known or arbitrary multi-start thread structure can be used for the threaded portion 31. However, the threaded portion 31 is not an essential component for achieving the effects of the present invention. For example, if the above-described engaging portion is formed on the outer surface of the cylindrical portion 30, the engaging portion of the cylindrical portion 30 may be configured to be able to fit onto the cap 20 via an engaged portion such as a lug provided at the lower end of the cap 20.

[0026] Referring to Figures 2 and 3, it is preferable that a release portion 32 is formed on the inner surface of the cylindrical portion 30 on the side of the cap 20 that is attached to the reversal center Ci. Note that "attachment side" means the positive direction of the Z axis. The release portion 32 has the function of smoothly releasing the magnet 10 by temporarily retracting the movable holding means 40 radially outward from the reversal center Ci of the cylindrical portion 30 when reversing from the holding state S2 to the release state S3 shown in Figure 2. Specifically, it is preferable that the release portion 32 has a recessed shape composed of an annular surface 32a that extends radially outward from the cylindrical portion 30 beyond the reversal center Ci, and an inner circumferential surface 32b that is continuous with the annular surface 32a and extends along the central axis C of the attachment 1 toward the side of the cap 20 that is attached to the cap. The radial width w1 of the cylindrical portion 30 within the annular surface 32a is preferably large enough to allow the movable holding means 40 to be temporarily housed in the release portion 32 during detachment, thereby enabling the above-described function to be performed. For example, it is more preferable that it is the same size as or substantially the same size as the maximum thickness of the movable piece 41, which will be described later. The "radial width w1" refers to the distance along the radial direction of the cylindrical portion 30 between the inner circumferential surface 32b and the inner circumferential surface 33a, which will be described later. The "reversal center Ci" is located, for example, on the extension of the inner circumferential surface 33a in the cross-sectional view of Figure 3.

[0027] Preferably, a relief portion 33 for mounting is formed on the inner surface of the cylindrical portion 30 on the side opposite to the mounting side of the cap 20 from the reversal center Ci. Note that "opposite side from the mounting side" means the negative direction of the Z axis. The relief portion 33 for mounting has the function of improving the insertability of the magnet 10 by temporarily retracting the movable holding means 40 radially inward from the reversal center Ci of the cylindrical portion 30 when reversing from the pre-mounting state S1 to the holding state S2 shown in Figure 2. Specifically, it is preferable that the relief portion 33 for mounting has a recessed shape composed of an inner circumferential surface 33a extending along the central axis C of the attachment 1 from the reversal center Ci to the side opposite to the mounting side of the cap 20, and an annular surface 33b that is continuous with the inner circumferential surface 33a and extends radially inward of the cylindrical portion 30. Therefore, in this embodiment, the inner diameter of the region of the cylindrical portion 30 in which the relief portion 33 for mounting is formed is smaller than the inner diameter of the region in which the relief portion 32 for detachment is formed. The radial width w2 of the cylindrical portion 30 of the annular surface 33b is preferably large enough to allow the movable holding means 40 to be temporarily housed in the relief portion 33 during installation, thereby enabling the above-described function to be performed. For example, it is more preferable that it is the same size as or substantially the same size as the maximum thickness of the movable piece 41. The "radial width w2" refers to the distance along the radial direction of the cylindrical portion 30 between the inner circumferential surface 33a and the magnet holding portion 34 (more specifically, the magnet holding surface) described later.

[0028] Preferably, a magnet holding portion 34 capable of holding the magnet 10 is formed on the inner surface of the cylindrical portion 30 on the side opposite to the mounting side of the cap 20 from the mounting relief portion 33. Specifically, it is preferable that the magnet holding portion 34 includes a magnet holding surface that is continuous with the annular surface 33b constituting the mounting relief portion 33 and extends along the central axis C of the attachment 1. This magnet holding surface faces the side surface 12 of the magnet 10 mounted on the attachment 1. Therefore, a step is formed by the mounting relief portion 33 and the magnet holding portion 34, and the inner diameter of the region of the cylindrical portion 30 in which the magnet holding portion 34 is formed is smaller than the inner diameter of the region in which the mounting relief portion 33 is formed.

[0029] Referring to Figure 4, it is preferable that the cylindrical portion 30 further includes a flange portion 35 that protrudes radially outward from the cylindrical portion 30 on the side opposite to the side on which the cap 20 is attached. It is even more preferable that the flange portion 35 protrudes radially outward from the cylindrical portion 30 and beyond the outer circumferential surface of the cap 20 when the cap 20 is attached, as shown in Figure 1. This allows the user to easily, for example, wrap the cap 20 around the cylindrical portion 30 while gripping the flange portion 35.

[0030] (Movable holding means) As described above with reference to Figures 1 and 2, the movable holding means 40 is configured to be reversible from a holding state S2 in which it holds the magnet 10 while tilted toward the opposite side of the cap 20 mounting side, with the inner surface of the cylindrical portion 30 as the reversal center Ci, to a detachment state S3 in which it detaches the magnet 10 while tilted toward the cap 20 mounting side. In other words, the movable holding means 40 is tilted downward in the holding state S2 and tilted upward in the detachment state S3.

[0031] Referring also to Figure 3, it is preferable that the movable holding means 40 includes a movable piece 41 in which the base portion 42 located on the inner surface side of the cylindrical portion 30 is formed to be thinner than the tip portion 43 located radially inward of the cylindrical portion 30 than the base portion 42. This allows the magnet 10 to be held at the tip portion 43 of the movable piece 41, and because the strength of the base portion 42 of the movable piece 41 is lower than the strength of the tip portion 43, the movable piece 41 can easily be reversed around the reversal center Ci. "Holding" does not necessarily mean that the magnet 10 is completely fixed within the attachment 1 by the movable piece 41 contacting the main surface 11 of the magnet 10. In this invention, as long as the magnetic attraction of the magnet 10 can hold documents, etc., it is permissible for the magnet 10 to rattle somewhat within the attachment 1 because the movable piece 41 is not in contact with the main surface 11 of the magnet 10. In the example shown in Figure 3, the thickness of the base portion 42 of the movable piece 41 is about half the thickness of the tip portion 43, but the present invention is not limited to this, and can be appropriately determined considering the material of the movable piece 41, etc.

[0032] In the example shown in Figure 4, the movable pieces 41 extend intermittently along the circumferential direction of the cylindrical portion 30. That is, the movable holding means 40 includes a plurality of movable pieces 41 (eight in Figure 4) arranged at predetermined intervals along the circumferential direction of the cylindrical portion 30. The predetermined interval L1 is not particularly limited as long as it is large enough to hold the magnet 10 and to allow the movable pieces 41 to be reversed, but for example it can be 10% to 50% of the length L2 along the circumferential direction of each movable piece 41. However, the present invention is not limited thereto, and the movable pieces 41 may extend continuously along the circumferential direction of the cylindrical portion 30.

[0033] In the holding state S2 shown in Figure 2, the movable holding means 40 is preferably pressed against the cap 20 from the mounting side toward the opposite side by a projection extending from the inner surface of the cap 20. This allows the magnet 10 to be held more firmly. In the example shown in Figure 1, the movable piece 41 corresponding to the movable holding means 40 is pressed diagonally downward by an inner ring 24 formed on the back surface 23 of the top surface 21 of the cap 20 in the holding state S2. More specifically, referring to Figure 3, as the cap 20 is tightened, the base 42 of the movable piece 41 is gradually pressed against by the tip 24a of the inner ring 24, so that a pressing force acts on the movable piece 41 from the mounting side toward the opposite side of the cap 20. As a result, this pressing force acts on the magnet 10 via the movable piece 41, and the magnet 10 is held firmly.

[0034] Referring to Figure 3, it is preferable that the angle θ between the first main surface 44 on the magnet 10 side of the movable piece 41 and the inner circumferential surface 33a be set such that, when the movable piece 41 is pressing against the magnet 10, the outermost tip P1 of the movable piece 41 is located radially inward from the outermost circumference P2 of the main surface 11 of the magnet 10. This ensures the retention of the magnet 10, while making it easier for the movable piece 41 to invert when releasing the magnet 10, thus making it easier to release the magnet 10. Furthermore, from the viewpoint of making it easier for the aforementioned pressing force to be transmitted by the movable piece 41, it is preferable that at least the base portion 42 of the movable piece 41 is in surface contact with the tip portion 24a of the inner ring 24 in the holding state S2.

[0035] Referring to Figure 5, the tip portion 43 of the movable piece 41 may also have a flat surface 46 formed therein, which is positioned along the main surface 11 of the magnet 10 in the holding state S2, instead of the movable piece 41 shown in Figures 1 to 4. As a result, when the inner ring 24 gradually presses down on the movable piece 41 as the cap 20 is tightened, the flat surface 46 of the movable piece 41 comes into contact with the main surface 11 of the magnet 10, and the magnet 10 is held more firmly.

[0036] (Support means) Referring to Figures 1 and 4, the support means 50 is configured to support the magnet 10 from the side opposite to the side on which the cap 20 is attached. Preferably, the support means 50 includes a projection 51 that protrudes radially inward from the cylindrical portion 30 and extends continuously or intermittently along the circumferential direction of the cylindrical portion 30. However, the support means 50 in the present invention is not limited to a projection 51 as long as it is capable of supporting the magnet 10. In the example shown in Figure 4, the projection 51 extends continuously along the circumferential direction of the cylindrical portion 30. The radial width w3 of the cylindrical portion 30 of the projection 51 is not particularly limited as long as it is possible to stably support the magnet 10. Also, if the projection 51 is formed intermittently, the number and spacing of the projections 51 are not particularly limited as long as it is possible to stably support the magnet 10.

[0037] Referring to Figures 1 and 4, it is preferable that a hole 60 is further formed radially inward of the cylindrical portion 30 beyond the support means 50. The hole 60 is intended to allow an external force to be applied to the magnet 10 from the opposite side of the cap 20 toward the attachment side when reversing from the holding state S2 to the detachment state S3 shown in Figure 2. An example of such external force is the force exerted by the user using their finger to push the magnet 10 from the opposite side of the cap 20 toward the attachment side when the cap 20 has been removed from the attachment 1. Therefore, the shape of the hole 60 does not necessarily have to be limited to a circular shape as shown in Figure 4, as long as it allows for pressing by the user's finger.

[0038] <2. Manufacturing method of attachments> An example of a manufacturing method for the attachment 1 according to this embodiment will be briefly described. The attachment 1 according to this embodiment can be manufactured by a known or arbitrary injection molding method using an injection molding die molded to form the outer shape of the attachment 1. Specifically, the attachment 1 is obtained by injecting heated and molten resin at a predetermined injection pressure into an injection molding die molded to form the outer shape of the cylindrical portion 30, movable holding means 40, and support means 50 that constitute the attachment 1, and then cooling it after molding. As the resin, a synthetic resin such as polyethylene or polypropylene having a degree of flexibility that allows the movable holding means 40 to be reversed can be used, but the present invention is not limited to these.

[0039] <3. Summary> The attachment 1 according to this embodiment described above is an attachment to which a magnet 10 can be attached and detached. The attachment 1 also includes a cylindrical portion 30 to which a cap 20 can be attached. The attachment 1 also includes a movable piece 41, which corresponds to a movable holding means 40, and with the inner surface of the cylindrical portion 30 as the reversal center Ci, it can reverse from a holding state S2 inclined toward the opposite side of the cap 20 attachment side to hold the magnet 10, to a detachment state S3 inclined toward the cap 20 attachment side to detach the magnet 10. The attachment 1 also includes a protruding portion 51, which corresponds to a support means 50 capable of supporting the magnet 10 from the opposite side of the cap 20 attachment side.

[0040] With this configuration, the movable piece 41, which corresponds to the movable holding means 40, can hold the magnet 10 within the attachment 1 by tilting diagonally downward in the holding state S2, and can detach the magnet 10 from the attachment 1 by tilting diagonally upward in the detachment state S3, which is the reverse of the holding state S2. Therefore, the cap 20 can be reused, and the attachment 1 can be easily separated when it is time to dispose of it.

[0041] <4. Attachment with cap> Referring to Figure 1, the cap-equipped attachment 2 according to this embodiment comprises the cap 20 described above and the attachment 1 to which the magnet 10 described above can be attached and detached. Furthermore, as described above, the inner ring 24, which corresponds to the projection extending from the inner surface of the cap 20, presses the movable piece 41, which corresponds to the movable holding means 40 of the attachment 1, from the side of the cap 20 that is attached to the opposite side.

[0042] The embodiments described above are examples, and various modifications are possible, such as combining the embodiments as appropriate, without departing from the spirit of the present invention. Furthermore, the embodiments described above may include any members not shown in the figures. In addition, the members shown in the figures may be changed or omitted without departing from the spirit of the present invention.

[0043] As one variation, the attachment 1 may further include a diameter-expanding means (not shown) that allows the inner diameter of the cylindrical portion 30 to be expanded and the magnet 10 to be attached and detached. That is, the magnet 10 is attached by expanding the inner diameter of the cylindrical portion 30 with the diameter-expanding means and pushing the magnet 10 into the attachment 1. On the other hand, the magnet 10 is removed by expanding the inner diameter of the cylindrical portion 30 with the diameter-expanding means and pushing the magnet 10 out of the attachment 1. The diameter-expanding means may be a slit provided on the side of the cylindrical portion 30 and penetrating along the axial direction of the cylindrical portion 30, or it may be a notch provided on at least the side of the cylindrical portion 30 on the side where the cap 20 is attached. In addition, the diameter-expanding means may be a thin-walled portion or a flexible portion formed in a location equivalent to a slit or notch instead of a slit or notch. [Industrial applicability]

[0044] The present invention is suitable for providing an attachment that enables the reuse of caps and facilitates easy sorting during disposal. [Explanation of Symbols]

[0045] 1: Attachment 2: Attachment with cap 10: Magnet 11: Main surface 12: Side view 20: Cap 21:Top section 22: Skirt Wall 23: Back side 24: Inner Ring 24a:Tip 25: Contact Ring 26: Screw 30: Cylindrical part 31: Screw part 32: Escape Unit during Departure 32a: Annular surface 32b: Inner peripheral surface 33: Relief section when attached 33a: Inner peripheral surface 33b: Annular surface 34: Magnet holder 35: Flange section 40: Movable holding means 41: Movable piece 42: Root part 43:Tip 44: First main surface 45: Second main surface 46:Flat surface 50 :Support means 51:Protrusion 60: Hole

Claims

1. A magnetic attachment that can be attached and detached, A cylindrical part into which a cap can be attached, A movable holding means that, with the inner surface of the cylindrical portion as the inversion center, is capable of reversing from a holding state inclined toward the opposite side of the cap mounting side to hold the magnet, to a detached state inclined toward the cap mounting side to detach the magnet, A support means capable of supporting the magnet from the opposite side of the cap from the mounting side, An attachment equipped with [a certain feature].

2. In the aforementioned holding state, the movable holding means is pressed against the cap from the mounting side toward the opposite side by a projection extending from the inner surface of the cap. The attachment according to claim 1.

3. The movable holding means is formed such that the base portion located on the inner surface side of the cylindrical portion is thinner than the tip portion located radially inward of the cylindrical portion than the base portion, and includes a movable piece that extends continuously or intermittently along the circumferential direction of the cylindrical portion. The attachment according to claim 1 or 2.

4. The tip portion is further formed with a flat surface that is positioned along the main surface of the magnet in the holding state. The attachment according to claim 3.

5. The support means includes a projection that protrudes radially inward from the cylindrical portion and extends continuously or intermittently along the circumferential direction of the cylindrical portion. A hole for applying an external force to the magnet from the opposite side of the cap toward the mounting side when reversing from the holding state to the detached state is formed radially inward of the cylindrical portion than the support means. The attachment according to claim 1.

6. When reversing from the holding state to the detached state, a release portion for detachment is formed on the inner surface of the cylindrical portion on the side of the cap that is attached to the cap, which allows the movable holding means to be temporarily retracted radially outward from the center of reversal. The attachment according to claim 1.

7. The movable holding means is in a pre-installation state, tilted toward the installation side of the cap before the magnet is installed. When reversing from the pre-installation state to the holding state, a relief portion for installation is formed on the inner surface of the cylindrical portion on the side opposite to the cap from the reversal center, which allows the movable holding means to be temporarily retracted radially inward from the reversal center. The attachment according to claim 1.

8. The cap and A magnet-detachable attachment as described in claim 1, An attachment with a cap, comprising: The projection extending from the inner surface of the cap presses the movable holding means of the attachment toward the opposite side of the cap. Attachment with cap.

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