Cap

Abstract

To provide a cap which can be more surely closed when the cap is pushed in while a force required when the cap is attached and detached is appropriately set.SOLUTION: The body portion 220 is provided with the engagement piece 223, and the inner peripheral surface of the cylindrical portion of the outer cap is provided with the sliding region that slides with respect to the outer peripheral surface of the body portion 220 and the outer peripheral surface of the engagement piece 223 when the outer cap slides with respect to the cap body 200, and the sliding region slides with respect to the outer peripheral surface of the engagement piece 223. The engaging protrusion provided on the inner peripheral surface of the engaging piece 223 is configured to be engageable with the engaged portion of the container body, and in the circumferential direction at any position in a range in which the sliding region can slide on the outer peripheral surface of the body portion 220 in the sliding direction, at least one non-contact portion where the outer peripheral surface of the body portion 220 and the inner peripheral surface of the tubular portion are not in contact with each other is formed.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cap. [Background technology]

[0002] Traditionally, screw-type caps were the mainstream for containers equipped with caps that could be attached and detached to the container body, but in recent years, caps that are easy to use and can be pulled out or pushed into the container body have come into use (see Patent Document 1).

[0003] In this technology, it is difficult to set the force required to attach and detach the cap appropriately while also ensuring that the cap closes more reliably when pressed in. Therefore, there is still room for improvement. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5390825 Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a cap that can be more reliably closed when pressed in, while the force required to attach and detach the cap is set to an appropriate level. [Means for solving the problem]

[0006] The present invention employs the following means to solve the above problems.

[0007] That is, the cap of the present invention is a cap body having a cylindrical body portion and detachably attached to the opening of the container body; an outer cap having a cylindrical portion that covers the outer periphery of the body portion and is slidable in the up and down direction; A cap comprising: An engaging piece having an engaging protrusion that can be engaged with an engaged protrusion provided on the outer circumferential surface of the mouth portion is provided below the body portion, a sliding region is provided on an inner peripheral surface of the cylindrical portion, which slides against an outer peripheral surface of the body portion and an outer peripheral surface of the engagement piece when the outer cap slides relative to the cap body; The sliding region slides against the outer peripheral surface of the engagement piece, so that the engagement protrusion can engage with the engaged portion, and When viewed circumferentially at any position on the outer peripheral surface of the body portion within the range in which the sliding area can slide in the sliding direction, there is formed at least one contact portion where the outer peripheral surface of the body portion and the inner peripheral surface of the tubular portion come into contact and one non-contact portion where they do not come into contact.

[0008] According to the present invention, since the contact portions and non-contact portions are provided as described above, it is possible to appropriately set the sliding resistance and the force required to attach and detach the cap. Furthermore, by providing the contact portions as described above, the engaging protrusion can be stably engaged with the engaged protrusion.

[0009] an outer cap side sliding portion formed of a cylindrical surface is provided within the sliding region on the inner circumferential surface of the cylindrical portion; The outer circumferential surface of the body portion has a cap body side sliding portion formed of a cylindrical surface, the contact area is formed by contact between the outer cap side sliding portion and the cap body side sliding portion, The non-contact portion may be formed by a recessed surface provided on at least one of the inner surface of the tubular portion and the outer surface of the body portion, or by a through hole provided on at least one of the tubular portion and the body portion.

[0010] The term "recessed surface" refers to a surface that is recessed relative to the cylindrical surface that forms the contact area. Therefore, flat surfaces are also included in the recessed surface.

[0011] The recessed surface may be provided on the outer peripheral surface of the body portion, and may extend in the sliding direction.

[0012] The outer diameter of the cap body side sliding portion may be equal to or smaller than the inner diameter of the outer cap side sliding portion.

[0013] This allows the contact area to be more reliably provided.

[0014] At least one of the inner circumferential surface of the cylindrical portion and the outer circumferential surface of the body portion may be roughened to form the contact portion and the non-contact portion.

[0015] The contact portion may be formed by providing a plurality of protrusions on one of the outer circumferential surface of the body portion and the inner circumferential surface of the cylindrical portion, the protrusions contacting the other.

[0016] The engaging piece may be formed as an enlarged diameter portion whose diameter increases toward the lower end, and the engaging projection may be provided on the inner peripheral surface of the enlarged diameter portion.

[0017] The enlarged diameter portions may be provided in plurality at intervals in the circumferential direction and over the entire circumference.

[0018] The non-contact portion is formed by a recessed surface that is provided on the outer circumferential surface of the body portion and extends in the sliding direction, and It is preferable that the center of the recessed surface and the center of the expanded diameter portion are positioned at the same position in the circumferential direction.

[0019] The above configurations may be combined as much as possible. [Effects of the Invention]

[0020] As described above, according to the present invention, the force required to attach and detach the cap can be set appropriately, and the cap can be more reliably closed when pressed in. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram of an outer cap according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of the cap body according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram of the cap body according to the first embodiment of the present invention. [Figure 4] FIG. 4 is an explanatory view of the operation of attaching and detaching the cap to and from the container body according to the first embodiment of the present invention. [Figure 5] FIG. 5 is an explanatory view of the operation of attaching and detaching the cap to and from the container body according to the first embodiment of the present invention. [Figure 6] FIG. 6 is an explanatory view of the operation of attaching and detaching the cap to and from the container body according to the first embodiment of the present invention. [Figure 7] FIG. 7 is an explanatory view of the operation of attaching and detaching the cap to and from the container body according to the first embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram of a cap body according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a schematic diagram of an outer cap according to a second embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory view of the attachment and detachment operation of the cap to and from the container body according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram of a cap according to a third embodiment of the present invention. [Figure 12] FIG. 12 is a schematic diagram of a cap according to a fourth embodiment of the present invention. [Figure 13] FIG. 13 is a diagram showing modified examples of the contact portion and the non-contact portion. [Figure 14] FIG. 14 is a diagram showing modified examples of the contact portion and the non-contact portion. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following detailed description of the present invention will be given by way of example with reference to the accompanying drawings, although the dimensions, materials, shapes, relative positions, etc. of the components described in the examples are not intended to limit the scope of the present invention unless otherwise specified.

[0023] In the following description, "upper" refers to the vertical direction when the cap is attached to the container body and facing upward relative to the container body, and "lower" refers to the vertical direction when the cap is attached to the container body and facing upward relative to the container body. The following examples will be described using examples of containers such as laminated tubes for storing toothpaste or paste seasonings. However, the present invention is not limited to such containers and can be applied to various types of containers, such as PET bottles, glass containers, and metal containers.

[0024] Example 1 A cap according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 is a schematic diagram of an outer cap according to a first embodiment of the present invention, where (a) is a plan view, (b) is a schematic cross-sectional view (A1-A1 cross-sectional view in (a) and A2-A2 cross-sectional view in (c)), and (c) is a bottom view. FIG. 2 is a schematic diagram of a cap body according to a first embodiment of the present invention, where (a) is a front view, and (b) is a view showing a part of the outer shape of the outer peripheral surface (a view showing only a part of the outer shape in the B1-B1 cross-section in (a)). FIG. 3 is a schematic diagram of a cap body according to a first embodiment of the present invention, where (a) is a plan view, (b) is a schematic cross-sectional view (B2-B2 cross-sectional view in (a) and B3-B3 cross-sectional view in (c)), and (c) is a bottom view. FIGS. 4 to 7 are explanatory views of the attachment and detachment of the cap according to the first embodiment of the present invention to and from a container body, with each member shown in a schematic cross-sectional view.

[0025] <Container> The container is composed of a container body 50 and a cap 10. First, the container body 50 will be described with reference to Figs. 4 to 7. Note that these figures only show a portion of the container body 50. The container body 50 comprises a body portion 51, a shoulder portion 52, and a mouth portion 500. Note that the mouth portion 500 is a portion that is narrower than the shoulder portion 52 at the top of the body portion 51, and corresponds to a neck portion having a mouth (opening) at the tip.

[0026] In this embodiment, the inner peripheral surface 510 of the mouth portion 500 is formed of a cylindrical surface. The inner peripheral surface 510 corresponds to the mouth (opening). An annular protrusion 522 is provided on the outer peripheral surface 520 of the mouth portion 500 as an engaged protrusion, the outer diameter of which is larger than the cylindrical surface 521 on the upper side (the tip side of the mouth portion 500). The outer peripheral surface of the annular protrusion 522 in this embodiment has a continuous tapered surface that expands in diameter from the upper end (tip) side of the mouth portion 500 towards the body portion 51, and a tapered surface that reduces in diameter from the upper end side towards the body portion 51, and the cross section of the annular protrusion 522 is approximately triangular. An annular groove 523 is provided below this annular protrusion 522. In this embodiment, Although the engaged protrusion is configured as an annular protrusion, the engaged protrusion in the present invention is not limited to an annular protrusion and may be configured as protrusions or stepped surfaces provided intermittently in the circumferential direction.

[0027] <Cap> The cap 10, which is configured to be detachable from the mouth 500 of the container body 50, will now be described in detail. In this embodiment, the cap 10 is configured to be attached to the mouth 500 by a pushing action, and to be detached from the mouth 500 by a pulling action. The cap 10 is configured to be comprised of an outer cap 100 and a cap body 200.

[0028] The cap body 200 includes a top plate 210 and a cylindrical body 220 attached to the mouth 500. The top plate 210 includes a seal portion 211 configured to protrude downward, and a cylindrical protrusion 212 provided radially inward of the body 220 and radially outward of the seal portion 211. The seal portion 211 includes a cylindrical portion 211a that can fit into the inner circumferential surface 510 of the mouth 500, and a closing portion 211b that closes the lower end of the cylindrical portion 211a. The cylindrical protrusion 212 serves to position the cap body 200 relative to the container body 50 by abutting against the tip of the mouth 500 of the container body 50. Note that as long as positioning is possible on the underside of the top plate 210, the top plate 210 may not necessarily be annular, but may instead be provided with multiple protrusions arranged intermittently in the circumferential direction, or may not have any cylindrical protrusions at all. Furthermore, in this embodiment, the sealing portion 211 is configured to include a cylindrical portion 211a and a closing portion 211b. However, as long as the sealing function is exhibited, such a configuration does not necessarily have to be adopted. For example, if a cylindrical protrusion (inner ring) extending downward from the underside of the top plate portion 210 is provided and the outer peripheral surface of this cylindrical protrusion is brought into close contact with the inner peripheral surface 510 of the opening portion 500, the lower end of the cylindrical protrusion does not have to be closed.

[0029] The body portion 220 includes a cylindrical portion 221 whose outer circumferential surface is a cylindrical surface, annular protrusions 222a and 222b, and an engagement piece 223. The engagement piece 223 is formed as an expanding diameter portion whose diameter expands from the lower portion of the cylindrical portion 221 toward the lower end. The inner circumferential surface of this engagement piece 223 is provided with an engagement protrusion 223a that can engage with an annular protrusion 522 provided on the outer circumferential surface of the opening 500 of the container body 50. The inner circumferential surface of the cylindrical portion 221 is formed as a stepped surface having a small-diameter surface 221a with a small inner diameter and a large-diameter surface 221b that is provided below the small-diameter surface 221a and has a larger inner diameter than the small-diameter surface 221a. As a result, the lower side of the cylindrical portion 221 is configured so that the wall thickness is thinner on the engagement piece 223 side, allowing the engagement piece 223 to bend easily while maintaining the rigidity of the cylindrical portion 221 as a whole. In this embodiment, the engaging pieces 223 are spaced apart from one another in the circumferential direction and are provided in multiple locations around the entire circumference. In this embodiment, the protruding portions 222a and 222b are annular and configured to protrude radially outward from the outer circumferential surface of the upper side of the cylindrical portion 221. However, in the present invention, the protruding portions may be provided intermittently in the circumferential direction. The cap body 200 is made of a resin material (e.g., polyethylene (PE) or polypropylene (PP)) that allows the engaging pieces 223 to have appropriate flexibility.

[0030] The outer cap 100 includes a top plate 110 and a cylindrical portion 120 that covers the outer periphery of the body portion 220 of the cap main body 200 and is vertically slidable. The inner peripheral surface of the cylindrical portion 120 includes, from top to bottom, a first surface 121 on which the protrusions 222a and 222b of the cap main body 200 are arranged, a second surface 122 having a smaller diameter than the first surface 121, and a third surface 123 having a larger inner diameter than the second surface 122. A first step surface 122a and a second step surface 122b, both of which are tapered surfaces, are provided between the first surface 121 and the second surface 122, and between the second surface 122 and the third surface 123, respectively. The outer cap 100 is made of various moldable resin materials, etc.

[0031] A sliding region is provided on the inner peripheral surface of the cylindrical portion 120 of the outer cap 100, where the outer peripheral surface of the engaging piece 223 slides against the outer peripheral surface of the body portion 220 when the outer cap 100 slides relative to the cap body 200. More specifically, the second surface 122 corresponds to the sliding region. The second surface 122 slides against the outer peripheral surface of the engaging piece 223, so that the engaging protrusion 223a can engage with the annular protrusion 522 serving as the engaged portion.

[0032] In this embodiment, when viewed in the circumferential direction at any position within the range (corresponding to range R in FIG. 2) of the outer peripheral surface of the body portion 220 where the second surface 122 can slide in the sliding direction, the outer peripheral surface of the body portion 220 and the inner peripheral surface of the cylindrical portion 120 are configured to have at least one contact portion where they come into contact and one non-contact portion where they do not come into contact. That is, cap body side sliding portions 221x and cap body side non-sliding portions 221y are alternately provided in the circumferential direction on the outer peripheral surface on the lower side of the cylindrical portion 221 (below the protruding portion 222a). In addition, in FIG. 1, the area facing the cap body side sliding portion 221x and the area facing the cap body side non-sliding portion 221y when the outer cap 100 slides relative to the cap body 200 are indicated by dotted lines. Note that the illustrated region is merely an example, and it goes without saying that the position of the illustrated region will change depending on the circumferential positional relationship between the outer cap 100 and the cap body 200. The region facing the cap body side sliding portion 221x is the outer cap side sliding portion 122x, and the region facing the cap body side non-sliding portion 221y is the outer cap side non-sliding portion 122y. That is, a contact region is formed by contact between the outer cap side sliding portion 122x and the cap body side sliding portion 221x on the second surface 122. Furthermore, the outer cap side non-sliding portion 122y and the cap body side non-sliding portion 221y do not come into contact, forming a non-contact region.

[0033] Here, the non-contact portion is formed by a recessed surface provided on at least one of the inner circumferential surface of the cylindrical portion 120 and the outer circumferential surface of the body portion 220, or a through-hole provided on at least one of the cylindrical portion 120 and the body portion 220. In the illustrated example, as described above, the non-contact portion is formed by the cap body side non-sliding portion 221y, which is a recessed surface provided on the outer circumferential surface of the body portion 220 and extending in the sliding direction. Note that the cap body side non-sliding portion 221y according to this embodiment may be formed by a flat or curved surface so as not to form an undercut portion when the resin cap body 200 is molded in a mold. Note that while FIG. 2(b) shows an example in which the cap body side non-sliding portion 221y is formed by a curved surface, it may also be formed by a flat surface as described above.

[0034] 2, this embodiment employs a configuration in which the center of the cap body side non-sliding portion 221y and the center of the engagement piece 223, which is the enlarged diameter portion, are positioned at the same position in the circumferential direction. By employing such a configuration, when molding the resin cap body 200 using a mold, the parting plane is aligned with the center of the cap body side non-sliding portion 221y and the center of the engagement piece 223, which is the enlarged diameter portion, so that a parting line is formed on the surfaces of the cap body side non-sliding portion 221y and the engagement piece 223. Even if the parting line remains on the surfaces of the cap body side non-sliding portion 221y and the engagement piece 223, it does not adversely affect quality, which has the advantage of eliminating the need for post-processing to remove the parting line.

[0035] <Dimensions of each component> The dimensional relationships between the components will be described in detail. As shown in Fig. 1, in the outer cap 100, the inner diameter of the first surface 121 is D11, the inner diameter of the second surface 122 (outer cap side sliding portion 122x) is D12, the inner diameter of the third surface 123 is D13, and the axial distance (height distance) of the second surface 122 (outer cap side sliding portion 122x), which is the sliding region, is L11.

[0036] As shown in FIG. 3, in the cap body 200, the cylindrical portion 221 of the body portion 220 The outer diameter of the cap body side sliding portion 221x in the sealing portion 211 is defined as D21, the maximum outer diameter of the protrusions 222a and 222b as D22, the maximum outer diameter of the engagement piece 223 as D23, and the outer diameter of the cylindrical portion 211a in the sealing portion 211 as D24. The inner diameter of the small diameter surface 221a on the inner circumferential surface of the body portion 220 is defined as D25, the inner diameter of the large diameter surface 221b on the inner circumferential surface of the body portion 220 as D26, and the minimum inner diameter of the engagement protrusion 223a as D27. Furthermore, the axial distance (height distance) below the protrusion 222a on the cylindrical portion 221 is defined as L21, and the axial distance (height distance) from the lower end of the cylindrical protrusion 212 to the engagement protrusion 223a is defined as L22.

[0037] As shown in FIG. 4, in the container body 50, the inner diameter of the inner peripheral surface 510 of the mouth 500 is D51, the outer diameter of the cylindrical surface 521 on the outer peripheral surface 520 of the mouth 500 is D52, and the maximum outer diameter of the annular protrusion 522 is D53.

[0038] In this embodiment, the above dimensions are configured to satisfy the following relationships: D11 ≥ D22 > D12 ≥ D21, D13 > D23, D24 > D51, D25 > D52, D26 ≥ D53, D27 ≥ D53, L21 > L11, L22 > L51. As shown in this formula, in this embodiment, D21, which corresponds to the outer diameter of the cap body side sliding portion 221x, is configured to be equal to or less than D12, which corresponds to the inner diameter of the outer cap side sliding portion 122x (second surface 122) (i.e., D12 ≥ D21). While it is desirable for D21 to be equal to D12, D21 may be slightly smaller than D12. The significance of satisfying these dimensional relationships will be explained appropriately in the attachment / detachment operation described below.

[0039] <Attaching and detaching the cap to the container body> 4 to 7, the operation of attaching and detaching the cap 10 to the container body 50 will be described. First, the operation of closing the cap 10 will be described.

[0040] In the cap 10, the cap body 200 is fitted in advance inside the outer cap 100. As described above, as shown in FIG. 4 , in this embodiment before engagement with the container body 50, the following relationships are satisfied: D11 ≥ D22 > D12 ≥ D21, D13 > D23, and L21 > L11. As a result, the outer cap 100 and the cap body 200 maintain a state in which the second surface 122, including the outer cap side sliding portion 122x on the inner circumferential surface of the tubular portion 120, is fitted between the protrusion 222a and the engagement piece 223 (see FIG. 4 ). When the cap 10 is fitted into the mouth portion 500 of the container body 50 in this state, first, the seal portion 211 of the cap body 200 fits into the inner circumferential surface 510 of the mouth portion 500 of the container body 50. The cap body 200 moves to a position where the cylindrical projection 212 abuts against the tip of the mouth part 500 of the container body 50 (see FIG. 5). By the above operation, the opening of the mouth part 500 is closed by the seal part 211.

[0041] Here, as described above, L22>L51 is satisfied. As a result, during the process of the cap body 200 moving to the position where the cylindrical projection 212 abuts against the tip of the mouth portion 500 of the container body 50, the engaging projection 223a passes over the annular projection 522 (see FIG. 5). Furthermore, in this embodiment, the minimum inner diameter of the engaging projection 223a when the engaging piece 223 is not deformed inward is configured to be equal to or greater than the maximum outer diameter of the annular projection 522. In other words, as described above, D27≧D53 is satisfied. Therefore, during the above-described movement process, the engaging projection 223a does not come into contact with the annular projection 522, or even if it does come into contact, almost no sliding resistance is generated.

[0042] When the cap 10 is further pushed in, the outer cap 100 begins to slide relative to the cap body 200. Also, the second surface 122 (particularly near the boundary between the second surface 122 and the second step surface 122b) on the inner circumferential surface of the cylindrical portion 120 pushes the engagement piece 223 inward. As a result, the engagement piece 223 begins to bend inward (see FIG. 6(a)). Note that FIG. 6(b) shows the outer shape of the outer circumferential surface of the body portion 220 shown in FIG. 2(b) and the second surface 122. The relationship with the outer shape of the inner peripheral surface is shown. As shown in the figure, on the second surface 122, the outer cap side sliding portion 122x is in contact with the cap body side sliding portion 221x. In contrast, a gap is formed between the outer cap side non-sliding portion 122y and the cap body side non-sliding portion 221y.

[0043] After that, when the cap 10 is further pushed in, the outer cap 100 slides until its top plate portion 110 abuts against the top plate portion 210 of the cap body 200. Also, by the second surface 122, the engaging piece 223 is in a state of being bent to a position where the engagement of the engaging projection 223a with the annular projection 522 is completed (see FIG. 7). Thus, when the outer cap 100 slides downward with respect to the cap body 200, the second surface 122, which has a smaller diameter than the maximum outer diameter of the engaging piece 223 on the inner peripheral surface of the cylindrical portion 120, slides on the outer peripheral surface of the engaging piece 223, causing the engaging piece 223 to deform inward. Thus, the relationship between D27 and D53 changes to D27 < D53.

[0044] Furthermore, during the process of attaching the cap body 200 to the mouth 500, after the seal portion 211 closes the opening of the mouth 500, the engaging protrusion 223a moves to a position where it completely engages with the annular protrusion 522. To achieve this, in this embodiment, the force required to slide the outer cap 100 relative to the cap body 200 is greater than the sliding resistance generated when the seal portion 211 closes the mouth 500. This point will be explained in more detail. In this embodiment, by satisfying D24 > D51, the seal portion 211 closely contacts the inner circumferential surface 510 of the mouth 500, thereby providing a seal, while sliding resistance is generated when the seal portion 211 is fitted onto the inner circumferential surface 510. In this embodiment, the following relationships are satisfied: D11 ≥ D22, D23 > D12, and D12 ≥ D21. When the outer cap 100 is slid relative to the cap body 200, sliding resistance is generated between the outer peripheral surfaces of the protrusions 222a and 222b and the inner peripheral surface of the first surface 121, and between the cap body-side sliding portion 221x and the outer cap-side sliding portion 122x. Furthermore, a force is required to deflect the engagement pieces 223 inward by the second surface 122. In this embodiment, the sum of the above-described sliding resistance and the force required to deflect the engagement pieces 223 is set to be greater than the sliding resistance generated between the seal portion 211 and the inner peripheral surface 510. This allows the engagement protrusions 223a to engage with the annular protrusion 522 after the seal portion 211 closes the opening of the mouth portion 500.

[0045] As described above, the cap 10 can be closed simply by pushing the cap 10 in.

[0046] Next, the operation of opening the cap 10 will be described. To open the cap 10, the user simply pulls the cap 10 from the container body 50. As a result, the outer cap 100 slides upward relative to the cap body 200 from the state shown in FIG. 7, and the engagement piece 223 returns to the original state shown in FIG. 6 due to its elastic restoring force. In this embodiment, a stopper structure is formed by the annular protrusion 222a provided on the outer peripheral surface of the body portion 220 and the first step surface 122a. This stopper structure allows the outer cap 100 to slide relative to the cap body 200 a certain distance, and then the cap body 200 is pulled out of the container body 50 together with the outer cap 100. In other words, the state shown in FIG. 5 changes to the state shown in FIG. 4.

[0047] <Advantages of the cap according to this embodiment> According to this embodiment, by sliding the outer cap 100 up and down, the engaging protrusion 223a provided on the cap body 200 can be engaged with or disengaged from the annular protrusion 522 provided on the mouth portion 500 of the container body 50.

[0048] The engagement protrusion 223a is provided on the inner circumferential surface of the engagement piece 223, which is formed as an enlarged-diameter portion provided below the body portion 220. By sliding the outer cap 100 up and down, the inner circumferential surface (second surface 122, second stepped surface 122b) of the tubular portion 120 of the outer cap 100 changes between a state in which it presses against the outer circumferential surface of the engagement piece 223 from the outside and a state in which it releases the pressure, causing the engagement piece 223 to deform and bend, thereby engaging and releasing the engagement protrusion 223a. Therefore, the force required to bend the engagement piece 223 or to return the engagement piece 223 to its original state can be set to be weak. In other words, simply by sliding the outer cap 100 downward, the inner circumferential surface (second stepped surface 122b and second surface 122) of the outer cap 100 slides over the outer circumferential surface of the engagement piece 223, which has a pre-expanded diameter, and the engagement piece 223 can be bent inward. Therefore, compared to a typical configuration in which the engaging portions of a cap without an enlarged diameter portion and a container are forcibly overcome each other, the force required to open and close the cap can be set weaker. This sliding action allows the engaging protrusion 223a to subsequently engage with the annular protrusion 522. Furthermore, by sliding the outer cap 100 upward, the engaging piece 223 returns to its original state by its elastic restoring force, rather than being forcibly disengaged as in the typical configuration described above, so the force required for sliding can be set weaker. This sliding action allows the engaging protrusion 223a to disengage from the annular protrusion 522.

[0049] According to this embodiment, a configuration is adopted in which the outer peripheral surface of the body portion 220 and the inner peripheral surface of the tubular portion 120 have contact portions and non-contact portions. This allows the sliding resistance when the outer cap 100 slides relative to the cap main body 200 to be appropriately set, thereby enabling the force required for attaching and detaching the cap to be appropriately set. In other words, if the force required for sliding is simply set to be weak, it is possible to achieve complete non-contact between the outer peripheral surface of the body portion 220 and the inner peripheral surface of the tubular portion 120 so that no sliding resistance occurs between them. However, adopting such a configuration may result in rattle between the outer cap 100 and the cap main body 200, which may result in insufficient engagement of the engaging protrusion 223a with the annular protrusion 522. On the other hand, complete contact not only increases the force required to slide the outer cap 100 relative to the cap main body 200, but also impairs movement, potentially preventing the engagement function between the engaging protrusion 223a and the annular protrusion 522 from being fulfilled.

[0050] In contrast, in this embodiment, by adopting a configuration in which a contact portion that makes contact and a non-contact portion that does not make contact, it is possible to appropriately set the force required to attach or detach the cap, as described above. Furthermore, by providing the contact portion, the occurrence of rattle between the outer cap 100 and the cap body 200 is suppressed, and therefore the engaging protrusion 223a can be stably engaged with the annular protrusion 522.

[0051] Example 2 A cap according to a second embodiment of the present invention will be described with reference to Figures 8 to 10. Figure 8 is a schematic diagram of a cap body according to the second embodiment of the present invention, where (a) is its plan view, (b) is its front view, and (c) is its schematic cross-sectional view (cross-sectional view taken along CC in (a)). Figure 9 is a schematic diagram of an outer cap according to the second embodiment of the present invention, where (a) is its plan view, (b) is its schematic cross-sectional view (cross-sectional view taken along DD in (a)), and (c) is an explanatory diagram of a groove provided in the outer cap. Figure 10 is an explanatory diagram of the operation of the cap according to the second embodiment of the present invention, showing each member in a schematic cross-sectional view.

[0052] <Container> As shown in Figures 10(b) and 10(c), the container is composed of a container body 50 and a cap 10X. Note that Figures 10(b) and 10(c) only show a portion of the container body 50. The container body 50 is the same as that described in Example 1, so a description thereof will be omitted.

[0053] <Cap> In this embodiment, the cap 10X also comprises an outer cap 100X and a cap body 200X.

[0054] The cap body 200X includes a top plate portion 210 and a cylindrical body portion 220X that is attached to the opening of the container body 50. The top plate portion 210 includes a seal portion 211 that is configured to protrude downward, and a cylindrical protrusion 212 that is provided radially outward of the seal portion 211. The configurations and functions of the seal portion 211 and the cylindrical protrusion 212 are the same as those in the first embodiment, and therefore a description thereof will be omitted. Furthermore, spring portions (a first spring portion 226 and a second spring portion 227) that serve as biasing means are integrally provided on the upper surface side of the top plate portion 210. In this embodiment, a pair of first spring portions 226 and a pair of second spring portions 227 are provided. The first spring portion 226 is composed of a pair of root portions 226a that slope away from each other as they extend upward from the top plate portion 210, and a pair of tip portions 226b that slope downward from the tip of the root portion 226a. The second spring portion 227 is composed of a pair of root portions 227a that slope away from each other as they extend upward from the top plate portion 210, and a pair of tip portions 227b that extend parallel to the top plate portion 210 from the tip of the root portion 227a. The first spring portions 226 and second spring portions 227 are alternately arranged at 90° intervals in the circumferential direction.

[0055] The body portion 220X is provided with an engagement piece 223, as in Example 1. The configuration and function of the engagement piece 223 are the same as in Example 1, and therefore a description thereof will be omitted. A plurality of protrusions 225 (four in this example) are provided at intervals in the circumferential direction on the outer peripheral surface of the body portion 220X according to this example. These protrusions 225 play a role in determining the positional relationship with the outer cap 100X.

[0056] The cap body 200X is made of a resin material (for example, polyethylene (PE) or polypropylene (PP)) that allows the engagement piece 223, the first spring portion 226, and the second spring portion 227 to have appropriate flexibility.

[0057] The outer cap 100X includes a top plate 110 and a cylindrical portion 120X that covers the outer periphery of the body portion 220X of the cap main body 200X and is configured to be slidable in the vertical direction. The inner peripheral surface of the cylindrical portion 120X includes a first cylindrical surface portion 122X that covers the cylindrical portion of the body portion 220X, a tapered surface portion 122Xb that increases in diameter downward from the first cylindrical surface portion 122X, and a second cylindrical surface portion 123X that is larger in diameter than the first cylindrical surface portion 122X. The first cylindrical surface portion 122X is provided with a plurality of grooves 125 (four in this embodiment) spaced apart in the circumferential direction. These grooves 125 are configured to receive the protrusions 225 of the cap main body 200X and serve to determine the positional relationship with the cap main body 200X. In this embodiment, the groove 125 is used as a configuration that fulfills this role, but as shown by the dotted line in FIG. 9(b), a through hole 125X can also be used instead of the groove.

[0058] Also in this embodiment, a sliding region is provided on the inner peripheral surface of the cylindrical portion 120X of the outer cap 100X, which slides against the outer peripheral surface of the engagement piece 223 and the outer peripheral surface of the body portion 220X when the outer cap 100X slides relative to the cap body 200X. More specifically, the region of the first cylindrical surface portion 122X below the groove 125 corresponds to the sliding region. This sliding region slides against the outer peripheral surface of the engagement piece 223, allowing the engagement protrusion 223a to engage with the annular protrusion 522 serving as the engaged portion.

[0059] In this embodiment, the outer circumferential surface of the body portion 220 in the sliding direction is When viewed circumferentially from any position within the range in which the sliding regions can slide, the outer circumferential surface of the body portion 220X and the inner circumferential surface of the cylindrical portion 120X are configured to have at least one contact region where they contact and one non-contact region where they do not contact. That is, cap body side sliding portions 221x and cap body side non-sliding portions 221y, each formed of a cylindrical surface, are alternately provided in the circumferential direction on the outer circumferential surface of the body portion 220X. Also, in FIG. 9, when the outer cap 100X slides relative to the cap body 200, the region facing the cap body side sliding portion 221x and the region facing the cap body side non-sliding portion 221y are indicated by dotted lines. The region facing the cap body side sliding portion 221x is the outer cap side sliding portion 122Xx, and the region facing the cap body side non-sliding portion 221y is the outer cap side non-sliding portion 122Xy. That is, in the sliding region, a contact area is formed by contact between the outer cap side sliding part 122Xx and the cap body side sliding part 221x, and a non-contact area is formed by no contact between the outer cap side non-sliding part 122Xy and the cap body side non-sliding part 221y.

[0060] Here, the non-contact portion is formed by a recessed surface provided on at least one of the inner circumferential surface of the cylindrical portion 120X and the outer circumferential surface of the body portion 220X, or a through-hole provided on at least one of the cylindrical portion 120X and the body portion 220X. In the illustrated example, as described above, the non-contact portion is formed by the cap body side non-sliding portion 221y, which is a recessed surface provided on the outer circumferential surface of the body portion 220X and extending in the sliding direction. The arrangement and configuration of the cap body side non-sliding portion 221y are the same as in the first embodiment.

[0061] <Attaching and detaching the cap to the container body> The operation of attaching and detaching the cap 10X to the container body 50 will be described. In the cap 10X, the cap body 200X is fitted in advance inside the outer cap 100X. The cap 10X is configured so that the cap body 200X is attached to the mouth when the outer cap 100X is in the locked position, and the cap body 200X is not attached to the mouth when the outer cap 100X is in the unlocked position. Figure 10(a) shows the cap 10X removed from the container body 50. Figure 10(b) shows the cap 10X in the process of being closed (the outer cap 100X is in the process of moving from the unlocked position to the locked position). Figure 10(c) shows the cap 10X in the closed state.

[0062] Hereinafter, the positional relationship between the cap body 200X and the outer cap 100X, and the positional relationship between the protrusion 225 of the cap body 200X and the groove 125 of the outer cap 100X during the attachment / detachment operation of the cap 10X to / from the container body 50 will be described.

[0063] Prior to this explanation, the configuration of the groove 125 will be described. As shown in FIG. 9(c), the groove 125 has an inverted U-shape when viewed from the front. A recess 125a is provided on the side of the groove 125 as a fitting portion recessed downward. Both side surfaces of the recess 125a are configured as inclined surfaces that slope upward in the left-right direction in the figure (corresponding to the direction in which the cap body 200X and the outer cap 100X rotate relative to each other). Furthermore, a curved end surface 125b is provided on the side surface of the groove 125 at a position facing the recess 125a, which serves as an end point for guiding the movement of the protrusion 225. Furthermore, a stopper 125c is provided on the bottom of the side surface of the groove 125 on both the left and right sides in the figure to restrict the downward movement of the protrusion 225. The side surface of the groove 125, excluding the recess 125a, the end curved surface portion 125b, and the stopper portion 125c, functions as a guide portion that guides the protrusion 225 to the end curved surface portion 125b.

[0064] As shown in FIG. 10(a), when the outer cap 100X is in the unlocked position, the protrusion 225 is in contact with the stopper portion 125c of the groove 125 (dotted line in FIG. 9(c)). (See the protrusion 225c1 indicated by a dotted line). In this embodiment, a stopper portion 125c is provided in the groove 125, and the relationship between the protrusion 225 and the groove 125 restricts the upward movement of the outer cap 100X relative to the cap body 200X within a predetermined range.

[0065] As shown in FIG. 10(a), when the outer cap 100X is in the unlocked position, the engagement piece 223 is accommodated inside the tapered surface portion 122Xb and the second cylindrical surface portion 123X of the outer cap 100X.

[0066] Then, the cap 10X is fitted onto the container body 50 so that the tip of the mouth of the container body 50 is inserted inside the engagement piece 223 of the cap body 200X, and the outer cap 100X is pushed in, causing the outer cap 100X to move downward relative to the cap body 200X. During the process of pushing in the outer cap 100X, the first spring portion 226 and the second spring portion 227 come into contact with the top plate portion 110 of the outer cap 100X, and the cap body 200X is pushed in together with the outer cap 100X. As a result, the seal portion 211 is fitted onto the inner circumferential surface of the mouth, and the cylindrical protrusion 212 abuts against the tip of the mouth of the container body 50. Furthermore, as the outer cap 100X slides downward relative to the cap body 200X, the inner circumferential surface of the tubular portion 120X slides over the outer circumferential surface of the engagement piece 223, causing the engagement piece 223 to deform inward, and the engagement protrusion 223a engages with the annular protrusion 522. In this way, the engaging pieces 223 are configured to deform inward before the outer cap 100X is positioned at the locked position. Note that the first spring portion 226 and the second spring portion 227 may be in contact with the top plate portion 110 of the outer cap 100X even in the unlocked position.

[0067] As the outer cap 100X is further pushed in, the cap body 200X remains stationary relative to the opening, while the first spring portion 226 and the second spring portion 227 are further compressed, causing the outer cap 100X to move further downward relative to the cap body 200X (see FIG. 10(b)). In this manner, during the process of pushing the outer cap 100X, the protrusion 225 is guided by the guide portion of the groove 125 and moves to the end-point curved surface portion 125b, as indicated by the solid arrow c1 in FIG. 9(c). The dotted line indicates the protrusion 225c2 during movement, and the dotted line indicates the protrusion 225c3 after reaching the end-point curved surface portion 125b. As such, when the outer cap 100X moves downward relative to the cap body 200X against the biasing forces of the first spring portion 226 and the second spring portion 227, the guide portion guides the protrusion 225 to a position directly above the recess 125a, which serves as the fitting portion.

[0068] Then, when the application of force to the outer cap 100X is stopped, the biasing force of the first spring portion 226 and the second spring portion 227 causes the outer cap 100X to rise relative to the cap main body 200X, and the outer cap 100X moves to the locked position. As described above, FIG. 10(c) shows the state in which the outer cap 100X is positioned in the locked position, thereby closing the cap 10X. During this process, as indicated by the solid arrow c2 in FIG. 9(c), the protrusion 225 moves directly downward to the recess 125a. As a result, the protrusion 225 is fitted into the recess 125a (see the protrusion 225c4 indicated by the dotted line in FIG. 9(c)). After the protrusion 225 is fitted into the recess 125a, even if a force acts to move the outer cap 100X vertically relative to the cap main body 200X, the protrusion 225 moves only between the recess 125a and the end curved surface portion 125b. Therefore, the state in which the engaging projection 223a is engaged with the annular projection 522 is maintained, and the cap 10X will not come off the container body 50.

[0069] To remove the cap 10X from the container body 50, the outer cap 100X is simply rotated slightly relative to the cap body 200X and then pulled out. By rotating the outer cap 100X, a force acts in the direction of relative rotation between the cap body 200X and the outer cap 100X from the state in which the outer cap 100X is in the locked position, and the projection 225 is released from the recess 125a. That is, as shown by the dotted arrow O1 in FIG. 9(c), Then, the protrusion 225 slides along the inclined surfaces that are the side surfaces of the recess 125a (see the protrusion 225o1 shown by the dotted line in the figure) and comes out of the recess 125a (see the protrusion 225o2 shown by the dotted line in the figure). Note that, since both side surfaces of the recess 125a are configured with inclined surfaces that slope upward in the direction of rotation, the outer cap 100X can be smoothly rotated relative to the cap body 200X.

[0070] Thereafter, when the rotation of the outer cap 100X is stopped, the biasing force of the first spring portion 226 and the second spring portion 227 causes the outer cap 100X to rise relative to the cap body 200X, and the outer cap 100X moves to the unlocked position. During this process, as shown by the dotted arrow O2 in FIG. 9(c), the protrusion 225 is guided by the guide portion of the groove 125 to a position where it abuts against the stopper portion 125c. Note that the dotted line indicates the protrusion 225o3 during movement, and the dotted line indicates the protrusion 225o4 after it has moved to the stopper portion 125c. Thereafter, the cap 10X can be removed from the container body 50 by pulling it out of the container body 50.

[0071] <Advantages of the cap according to this embodiment> In this embodiment, as in the above-described first embodiment, by sliding the outer cap 100X up and down, the engaging protrusion 223a provided on the cap body 200X can be engaged with or disengaged from the annular protrusion 522 provided on the opening of the container body 50. In addition, the force required to deflect the engaging piece 223 or to return the engaging piece 223 to its original state can be set to be weak.

[0072] Also in this embodiment, similar to the first embodiment, a configuration is adopted in which a contact portion where the outer peripheral surface of the body portion 220X and the inner peripheral surface of the cylindrical portion 120X come into contact with each other and a non-contact portion where they do not come into contact with each other are provided. Therefore, similar to the first embodiment, the force required to attach or detach the cap can be set appropriately, and the engaging protrusion 223a can be stably engaged with the annular protrusion 522.

[0073] Furthermore, in this embodiment, unless the outer cap 100X is rotated circumferentially relative to the cap body 200X, the outer cap 100X will not move to the unlocked position, thereby preventing the cap from opening against the user's will.

[0074] Example 3 Figure 11 shows Example 3 of the present invention. In this example, the configuration of the outer cap will be described, which differs from Example 1. The other configurations and functions are the same as in Example 1, so the same components are given the same reference numerals and their description will be omitted.

[0075] 11 is a schematic diagram (schematic cross-sectional view) of a cap according to Example 3 of the present invention. Similar to Example 1, the cap according to this example is also composed of an outer cap 100Y and a cap body 200. The cap body 200 and the container body 50 have the same configuration as in Example 1, and therefore a description thereof will be omitted.

[0076] The outer cap 100Y according to this embodiment includes a top plate portion 110, a cylindrical portion 120 that covers the outer periphery of the body portion 220 of the container body 50 and is slidable in the vertical direction, and a second cylindrical portion 130 that is provided concentrically with the cylindrical portion 120 and has a larger diameter than the cylindrical portion 120. The configuration of the cylindrical portion 120 is the same as that of the first embodiment.

[0077] In the first embodiment, the cylindrical portion 120 covers only the vicinity of the mouth portion 500, whereas in the present embodiment, the second cylindrical portion 130 is configured to cover the shoulder portion 52 as well.

[0078] It goes without saying that the cap and container equipped with the outer cap 100Y configured as above can also achieve the same effects as those of the first embodiment.

[0079] Example 4 Figure 12 shows Example 4 of the present invention. In Example 1 above, an engagement piece formed as an expanded diameter portion is provided below the body portion of the cap body, and an engagement protrusion is provided on the inner peripheral surface of the engagement piece. In this example, an engagement piece configured to prevent the diameter from expanding is provided below the body portion, and an engagement protrusion is provided on the inner peripheral surface of the engagement piece. The other configurations and functions are the same as in Example 1, so the same components are designated by the same reference numerals and their description will be omitted.

[0080] FIG. 12 is a schematic cross-sectional view of a cap according to Example 4 of the present invention. Note that in FIG. 12, only a cross section of a portion of the cap body is shown, and depth lines are omitted. Similar to Example 1, the cap 10Z according to this example also includes a cap body 200Z and an outer cap 100. An engaging protrusion 223Za is provided below the inner circumferential surface of the body portion of the cap body 200Z. Although not specifically shown, multiple slits are provided at intervals in the circumferential direction to facilitate inward deformation of the portion of the body portion where the engaging protrusion 223Za is provided, and the portions between the slits function as engaging pieces. Furthermore, pressed protrusions 223Zb are provided on the outer circumferential surfaces of these engaging pieces.

[0081] With the above configuration, by moving the outer cap 100 downward relative to the cap body 200Z, the inner peripheral surface of the cylindrical portion of the outer cap 100 presses the pressed protrusion 223Zb, causing the engaging piece to deform inward. As a result, similar to the first embodiment, the engaging protrusion 223Za can be engaged with the annular protrusion provided on the outer peripheral surface of the mouth of the container body.

[0082] Although not specifically shown, this embodiment can also employ a configuration in which, as in Embodiment 1, a contact portion where the outer peripheral surface of the body portion of the cap body 200Z and the inner peripheral surface of the cylindrical portion of the outer cap 100 come into contact with each other and a non-contact portion where they do not come into contact with each other. This allows the force required to attach or detach the cap 10Z to be set appropriately, and also allows the engaging protrusion 223Za to stably engage with the annular protrusion 522 of the container body.

[0083] (others) In the above-described Example 1, a configuration was shown in which a plurality of "contact portions" and a plurality of "non-contact portions" were alternately arranged by alternately arranging a plurality of cap body side sliding portions 221x and a plurality of cap body side non-sliding portions 221y. However, the arrangement and number of the "contact portions" and "non-contact portions" are not particularly limited, and it is sufficient that at least one of each is formed.

[0084] Furthermore, in the above-described Example 1, a configuration has been shown in which a "contact portion" and a "non-contact portion" are formed by providing the cap body side sliding portion 221x and the cap body side non-sliding portion 221y on the outer peripheral surface of the body portion 220 of the cap body 200. However, the configuration for forming the "contact portion" and the "non-contact portion" is not particularly limited.

[0085] For example, a non-contact portion can be formed by providing a recessed surface on the inner circumferential surface of the cylindrical portion of the outer cap, rather than on the body portion of the cap body. Alternatively, a non-contact portion can be formed by providing a through-hole, rather than a recessed surface, on at least one of the body portion of the cap body and the cylindrical portion of the outer cap. When a through-hole is provided in the body portion, for example, as shown in FIG. 13, a non-contact portion can be formed by a slit 221ya (corresponding to a through-hole) formed in the body portion so as to connect to the gap between adjacent engagement pieces 223. In this case, the contact portion is formed by the cap body-side sliding portion 221xa, which does not have a slit 221ya.

[0086] Fig. 14 shows a modified example of the arrangement of the "contact portion" and the "non-contact portion." Note that Fig. 14 shows only the appearance of a portion of the outer circumferential surface of cylindrical portion 221 shown in Fig. 2 that corresponds to range R in which second surface 122 can slide.

[0087] 14(a), the recessed surface 221yb (which may be a through hole) is composed of a portion configured to extend from the upper end of the range R to partway downward, and a portion configured to extend from the lower end of the range R to partway upward. The portion where the recessed surface 221yb is not provided corresponds to the cap body side sliding portion 221xb, as in Example 1. In this example as well, when viewed in the circumferential direction at any position in the range R, it is possible to form at least one contact portion where the outer circumferential surface of the body portion and the inner circumferential surface of the tubular portion come into contact and at least one non-contact portion where they do not come into contact.

[0088] 14(b), the cap body side sliding portion 221xc and the cap body side non-sliding portion 221yc are configured to extend obliquely downward from above. In this example, when viewed in the circumferential direction at any position within range R, it is possible to form at least one contact portion where the outer circumferential surface of the body portion and the inner circumferential surface of the tubular portion come into contact and at least one non-contact portion where they do not come into contact.

[0089] In the example shown in FIG. 14(c), the surface of the range R of the outer circumferential surface of the cylindrical portion 221, along which the second surface 122 can slide, is configured as a rough surface. The rough surface can be formed, for example, by sandblasting after molding the cap body, or by processing the surface of the mold. Even in this example, when viewed circumferentially at any position within the range R, at least one contact area where the outer circumferential surface of the body portion and the inner circumferential surface of the cylindrical portion come into contact and one non-contact area where they do not come into contact can be formed. The above-mentioned "rough surface" is at least rougher than the surface roughness of other areas of the cap body (particularly areas requiring sealing).

[0090] 14 shows a configuration in which various structures are provided on the outer peripheral surface of the cap body. However, a configuration in which a contact portion and a non-contact portion are formed by providing a similar structure on the inner peripheral surface of the outer cap may also be employed. Furthermore, a configuration in which a contact portion and a non-contact portion are formed by providing a similar structure on both the outer peripheral surface of the cap body and the inner peripheral surface of the outer cap may also be employed.

[0091] In addition, in each of the above-described embodiments, a configuration has been shown in which the contact portion is formed by a cylindrical surface portion, and the non-contact portion is formed by a recessed surface or a through hole. However, a configuration can also be adopted in which the contact portion is formed by providing multiple protrusions on one of the outer peripheral surface of the body portion and the inner peripheral surface of the tubular portion, which contact the other. In this case, the cylindrical surface portion can be the non-contact portion. [Explanation of symbols]

[0092] 10, 10X, 10Z: Cap 50: Container body 51: Torso 52:Shoulder 100, 100X, 100Y: Outer cap 110: Top plate 120, 120X: Cylindrical part 121: 1st page 122: Second surface 122X: First cylindrical surface portion 122Xb: Tapered surface portion 122 a: 1st step surface 122b: 2nd step surface 122x, 122Xx: Sliding part on outer cap side 122y, 122Xy: Non-sliding part on outer cap side 123:Side 3 123X: 2nd cylindrical surface part 125: Groove 125X:hole 125a: Recessed portion 125b: End point curved surface portion 125c: Stopper portion 130: Second cylindrical portion 200, 200X, 200Z: Cap body 210: Top plate 211: Sealing portion 211a: Cylindrical portion 211b: Closure portion 212: Cylindrical protrusion 220,220X: body part 221: Cylindrical portion 221a: Small diameter surface 221b: Large diameter surface 221x, 221xa, 221xb, 221xc: Cap body side sliding part 221y, 221yb, 221yc: Non-sliding part of the cap body 221ya:Slit 223: Engaging piece 223a: Engaging protrusion 223Za: Engaging protrusion 223Zb: Pressed protrusion 225: Protrusion 226: First spring portion 226a: Base portion 226b: Tip portion 227: Second spring part 227a: Base part 227b: Tip part 500: Mouth 510: Inner peripheral surface 520: Outer peripheral surface 521: Cylindrical surface 522: Annular protrusion 523: Annular groove

Claims

1. a cap body having a cylindrical body portion and detachably attached to the opening of the container body; an outer cap having a cylindrical portion that covers the outer periphery of the body portion and is slidable in the up and down direction; A cap comprising: An engaging piece having an engaging protrusion that can be engaged with an engaged protrusion provided on the outer circumferential surface of the mouth portion is provided below the body portion, a sliding region is provided on an inner peripheral surface of the cylindrical portion, which slides against an outer peripheral surface of the body portion and an outer peripheral surface of the engagement piece when the outer cap slides relative to the cap body; The sliding region slides against the outer peripheral surface of the engagement piece, so that the engagement protrusion can be engaged with the engaged protrusion, and A cap characterized in that, when viewed circumferentially at any position on the outer surface of the body portion within the range in which the sliding area can slide in the sliding direction, at least one contact area where the outer surface of the body portion and the inner surface of the tubular portion come into contact and one non-contact area where they do not come into contact are formed.

2. an outer cap side sliding portion formed of a cylindrical surface is provided within the sliding region on the inner circumferential surface of the cylindrical portion; The outer circumferential surface of the body portion has a cap body side sliding portion formed of a cylindrical surface, the contact area is formed by contact between the outer cap side sliding portion and the cap body side sliding portion, 2. The cap according to claim 1, wherein the non-contact portion is formed by a recessed surface provided on at least one of the inner surface of the tubular portion and the outer surface of the body portion, or by a through hole provided on at least one of the tubular portion and the body portion.

3. The cap according to claim 2 , wherein the recessed surface extending in the sliding direction is provided on an outer peripheral surface of the body portion.

4. 4. The cap according to claim 2, wherein the outer diameter of the cap body sliding portion is equal to or smaller than the inner diameter of the outer cap sliding portion.

5. The cap according to claim 1, characterized in that at least one of the inner surface of the cylindrical portion and the outer surface of the body portion is roughened, thereby forming the contact portion and the non-contact portion.

6. The cap according to claim 1, wherein the contact portion is formed by providing a plurality of protrusions on one of the outer peripheral surface of the body portion and the inner peripheral surface of the tubular portion, the protrusions contacting the other.

7. 3. The cap according to claim 1, wherein the engaging piece is formed as a diameter-increasing portion that increases in diameter toward the lower end, and the engaging projection is provided on an inner peripheral surface of the diameter-increasing portion.

8. The cap according to claim 7, wherein the enlarged diameter portions are provided in a plurality at intervals in the circumferential direction over the entire circumference.

9. The non-contact portion is formed by a recessed surface that is provided on the outer circumferential surface of the body portion and extends in the sliding direction, and The center of the recessed surface and the center of the expanded diameter portion are arranged to be at the same position in the circumferential direction. The cap according to claim 8 .

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