Container cap and container using same

Abstract

To provide a cap for a container which improves the sealing performance between an outer lid and an inner lid. [Solution] A cap that is formed to be able to seal the opening of a container and is equipped with a biasing means that is provided between an outer ceiling and the inner ceiling and biases the outer ceiling and the inner ceiling in a direction separating them, wherein a first convex portion is formed on the inner surface of the outer peripheral wall of the outer cap, extending circumferentially and protruding toward the inner peripheral wall, a second convex portion is formed on the outer surface of the inner peripheral wall of the inner cap, extending circumferentially on the outer surface closer to the outer ceiling than the first convex portion, protruding toward the outer peripheral wall, and overlapping with the first convex portion when the outer ceiling portion and the inner ceiling are spaced a predetermined distance apart, and a third convex portion is formed on either the outer surface of the inner peripheral wall or the inner surface of the outer peripheral wall, extending circumferentially closer to the outer ceiling than the second convex portion, and protruding to the other of the outer surface of the inner peripheral wall and the inner surface of the outer peripheral wall.

Description

[Technical Field]

[0001] The present invention relates to a cap for a container and a container using the same. [Background technology]

[0002] As a cap for a container for storing medicines or the like, a so-called safety cap with a child-resistant function (hereinafter referred to as a CR function) that makes it difficult for small children to open is known. Patent documents 1 and 2 disclose safety caps with such a CR function that include an outer lid and an inner lid. These safety caps are attached so that the outer lid and the inner lid can rotate relative to each other and can move up and down relative to each other within a predetermined range. These safety caps are of the so-called push-and-turn type, which can be opened by pushing the outer lid down against the inner lid with a certain force or more. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-206730 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-204021 Summary of the Invention [Problem to be solved by the invention]

[0004] These safety caps have a double structure consisting of an outer lid and an inner lid, so if the contents of the container are liquid, there is a risk that the liquid may seep into the gap between the outer and inner lids. In particular, if the contents are liquid chemicals, if the liquid seeps inside and is left as is, it may affect the function of the safety cap. SUMMARY OF THE INVENTION An object of the present invention is to provide a cap for a container that improves the sealing performance between the outer lid and the inner lid. [Means for solving the problem]

[0005] The present invention solves the above-mentioned problems, and is a cap comprising: an inner cap formed to be able to seal an opening of a container, and having an inner ceiling and an inner peripheral wall hanging down from the edge of the inner ceiling; an outer cap attached to cover the inner cap so as to be movable relative to the inner cap, the outer cap having an outer ceiling that covers the inner ceiling and an outer peripheral wall that hangs down from the edge of the outer ceiling and covers at least a part of the inner peripheral wall; and a biasing means provided between the outer ceiling and the inner ceiling for biasing the outer ceiling and the inner ceiling in a direction separating them, A first convex portion is formed on the inner surface, extending circumferentially and protruding toward the inner wall; a second convex portion is formed on the outer surface of the inner wall of the inner cap, extending circumferentially on the outer surface closer to the outer ceiling than the first convex portion, protruding toward the outer wall, and overlapping the first convex portion when the outer ceiling and the inner ceiling are spaced a predetermined distance apart; and a third convex portion is formed on either the outer surface of the inner wall or the inner surface of the outer wall, extending circumferentially on the outer ceiling closer to the second convex portion, and protruding to the other of the outer surface of the inner wall and the inner surface of the outer wall.

[0006] Here, it is preferable to provide a first engagement means that engages the outer cap with the inner cap when the outer cap is rotated in the opening direction while the outer ceiling and the inner ceiling are close to each other at a predetermined distance, and a second engagement means that engages the outer cap with the inner cap when the outer cap is rotated in the closing direction. Preferably, the first protrusion is formed continuously along the circumferential direction. Preferably, a plurality of the second protrusions are formed at predetermined intervals along the circumferential direction. Preferably, the third protrusion is formed continuously along the circumferential direction. Preferably, the third protrusion is formed to have a lower protrusion height than the second protrusion. The first protrusion may be provided at an end of the outer peripheral wall opposite to the end on the outer ceiling side. The inner surface of the outer peripheral wall may be inclined so that the inner diameter of the outer peripheral wall increases from the end on the outer ceiling side to the opposite end. Preferably, the outer peripheral wall comprises an upper peripheral wall and a lower peripheral wall whose inner surfaces have different inclination angles, and the lower peripheral wall has a larger inclination angle relative to the vertical direction than the upper peripheral wall. In addition, in a state in which the outer cap and the inner cap are engaged by the first engaging means, at least a portion of the third protrusion may abut or nearly abut against the upper peripheral wall. In addition, an inner plug formed to be able to seal the opening of the container is provided inside the inner cap, and the inner plug has a disk-shaped main body provided along the back surface of the inner ceiling and a protrusion that protrudes from the main body and can be inserted into the opening, and a recess is formed on the inner surface of the inner wall that can accommodate the peripheral portion of the main body of the inner plug. The inner circumferential wall may be provided with the third protrusion on an outer surface of a portion where the recess is provided. Preferably, a plurality of the third protrusions are formed at predetermined intervals along the circumferential direction. Preferably, a plurality of the first protrusions are formed at predetermined intervals along the circumferential direction. Furthermore, the second protrusions may be formed continuously along the circumferential direction. [Effects of the Invention]

[0007] The container cap according to the present invention and the container using the same serve as a safety cap having a CR function, and can improve the sealing performance between the outer lid and inner lid of the cap. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a cap according to an embodiment of the present invention and a container using the cap. [Figure 2] FIG. 2 is an exploded perspective view of the cap of the present embodiment. [Figure 3] FIG. 2 is a cross-sectional view of the cap according to the embodiment. [Figure 4] (a) is a perspective view of the outer cap of this embodiment as seen from the top side, (b) is a perspective view of the outer cap of this embodiment as seen from the bottom side, and (c) is a cross-sectional view of the outer cap of this embodiment. [Figure 5] 1A is a perspective view of the inner cap of this embodiment as seen from the top side, FIG. 1B is a perspective view of the inner cap of this embodiment as seen from the bottom side, and FIG. 1C is a cross-sectional view of the inner cap of this embodiment. [Figure 6] FIG. 2(a) is a perspective view of the inside plug of this embodiment as seen from the top side, FIG. 2(b) is a perspective view of the inside plug of this embodiment as seen from the bottom side, and FIG. 2(c) is a cross-sectional view of the inside plug of this embodiment. [Figure 7] (a) A partially enlarged cross-sectional view showing the relative relationship between the outer cap and the inner cap when operating the container cap of this embodiment, and (b) a partially enlarged cross-sectional view showing the relative relationship between the outer cap and the inner cap when operating the container cap of this embodiment. [Figure 8] FIG. 10 is a diagram corresponding to FIG. 7(a) in Modification 1. [Figure 9] (a) A diagram schematically showing the first convex portion, the second convex portion, and the third convex portion of Modification Example 2; (b) A diagram schematically showing the first convex portion, the second convex portion, and the third convex portion of Modification Example 3; (c) A diagram schematically showing the first convex portion, the second convex portion, and the third convex portion of Modification Example 4. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the container cap of the present invention will be described in detail with reference to the drawings, although the present invention is not limited to these embodiments.

[0010] <Overall configuration of container 100> Fig. 1 is a perspective view of a container 100 of this embodiment. As shown in Fig. 1, the container 100 of this embodiment includes a container body 101 capable of accommodating contents, and a cap 1 capable of sealing an opening 103 provided at the top of the container body 101. The cap 1 is formed so that it can be attached and detached to a threaded portion 107 provided on a peripheral wall 105 of the container body 101 by a threaded portion (not shown) provided on the inner peripheral surface of the cap 1. In the following description, the upper and lower sides of the container body 101 and cap 1 of this embodiment are defined by the directions of the up and down arrows shown in Fig. 1, i.e., the up and down directions in Fig. 1. In addition, in the following description, the "opening direction" refers to the counterclockwise rotation direction indicated by the rotation direction arrow in Fig. 1, and the "closing direction" refers to the clockwise rotation direction.

[0011] <Basic configuration of Cap 1> FIG. 2 is an exploded perspective view of the cap 1 of this embodiment. As shown in FIG. 2, the cap 1 of this embodiment includes an outer cap 3, an inner cap 5 provided inside the outer cap 3, and an inner plug 7 provided inside the inner cap 5. The outer cap 3 and the inner cap 5 are assembled in a state in which they can rotate relative to each other. The outer cap 3 and the inner cap 5 are also assembled so that they can move relatively close to or apart from each other within a predetermined range in the vertical direction. Furthermore, the outer cap 3 includes a biasing means for biasing the outer cap 3 in a direction in which it moves away from the inner cap 5. The specific configuration of the biasing means will be described later.

[0012] The cap 1 is provided with a first engagement means that engages the outer cap 3 with the inner cap 5 when the outer cap 3 is rotated in the opening direction while the outer cap 3 and the inner cap 5 are close to each other at a predetermined distance. The cap 1 also is provided with a second engagement means that engages the outer cap 3 with the inner cap 5 when the outer cap 3 is rotated in the closing direction. The first and second engagement means, together with the aforementioned biasing means, act as a CR function that prevents small children and others from accidentally opening the cap 1. The specific configurations of the first and second engagement means will be described later. Each component will be described in detail below.

[0013] <Outer cap 3> Fig. 3 is a cross-sectional view of the cap 1 according to this embodiment, Fig. 4(a) is a perspective view of the outer cap 3 as seen from the top side, Fig. 4(b) is a perspective view of the outer cap 3 as seen from the bottom side, and Fig. 4(c) is a cross-sectional view of the outer cap 3. The outer cap 3 according to this embodiment will be described below with reference to Fig. 3 and Figs. 4(a) to 4(c).

[0014] 4, the outer cap 3 of this embodiment is formed in a cylindrical shape with a top, and includes an outer ceiling 31 and an outer peripheral wall 33 suspended from the periphery of the outer ceiling 31. The lower end of the outer peripheral wall 33 forms an opening 301 through which the inner cap 5 can be inserted.

[0015] The outer ceiling 31 of this embodiment is formed in a circular flat plate shape. The outer peripheral wall 33 of this embodiment is formed in a substantially cylindrical shape. The outer ceiling 31 covers the inner ceiling 51 of the inner cap 5, which will be described later. The outer peripheral wall 33 partially covers the inner peripheral wall 53 of the inner cap 5. The inner surface of the outer peripheral wall 33 (upper wall surface 333, lower wall surface 335) is formed in a tapered shape so that the inner diameter and outer diameter gradually increase from the upper end connected to the outer ceiling 31 to the lower end on the opening 301 side. The tapers of the inner surface of the outer peripheral wall 33 (upper wall surface 333, lower wall surface 335) and the outer surface 331 are formed with different inclination angles.

[0016] The inner surface of the outer peripheral wall 33 comprises an upper wall surface 333 and a lower wall surface 335. Of these, the upper wall surface 333 refers to the region from the upper end connected to the outer ceiling 31 to approximately the middle part of the outer peripheral wall 33 in the vertical direction. The lower wall surface 335 refers to the region from the lower end (bend portion 337) of the upper wall surface 333 to the lower end of the outer peripheral wall 33. Both the upper wall surface 333 and the lower wall surface 335 are formed with a tapered inclination, but the inclination angles are different. This point will be described in detail later. Furthermore, the outer surface 331 of the outer peripheral wall 33 is knurled to prevent slipping.

[0017] A first protrusion 35 is provided near the lower end of the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3. A protrusion 39 constituting the first engagement means is provided on the back surface 313 of the outer ceiling 31. A spring 37 constituting the second engagement means is provided on the back surface of the outer ceiling 31. The "first engagement means" here refers to a means for engaging the outer cap 3 with the inner cap 5 when the outer cap 3 is rotated in the opening direction, and in this embodiment, is comprised of the protrusion 39 and the recess 571. The "second engagement means" refers to a means for engaging the outer cap 3 with the inner cap 5 when the outer cap 3 is rotated in the closing direction, and in this embodiment, is comprised of the spring 37 and the protrusion 515. Each of these components will be described in more detail below.

[0018] As described above, the inner surfaces (upper wall surface 333 and lower wall surface 335) of the outer peripheral wall 33 in this embodiment are formed so that the inclination angles of the taper differ between the upper and lower portions of the outer peripheral wall 33. A bent portion 337 is formed at the boundary between the upper wall surface 333 and the lower wall surface 335, where the inclination angles of the taper differ. The upper wall surface 333 above the bent portion 337 is formed so that the inclination angle with respect to the vertical direction is smaller. The inclination angle θ1 of the upper wall surface 333 is not particularly limited, but is preferably in the range of 0 to 1.8 degrees with respect to the vertical direction. On the other hand, the lower wall surface 335 below the bent portion 337 is formed so that the inclination angle is larger. The inclination angle θ2 of the lower wall surface 335 is not particularly limited, but is preferably in the range of 4 to 5 degrees with respect to the vertical direction. That is, the difference in the inclination angle between the upper wall surface 333 and the lower wall surface 335 is preferably in the range of 2.2 to 5 degrees. In this way, the angle of inclination is smaller on the upper wall surface 333 and larger on the lower wall surface 335 at the boundary of the bent portion 337, so that the corner of the bent portion 337 protrudes radially inward from the outer wall 33.

[0019] In the present embodiment, the bent portion 337 is formed at a position near the midpoint in the vertical direction of the outer peripheral wall 33 or slightly below the midpoint of the outer peripheral wall 33. More specifically, when the outer cap 3 is assembled to the inner cap 5 (FIG. 3), the bent portion 337 is positioned above a third protrusion 505 of the inner cap 5, which will be described later.

[0020] The first protrusion 35 of this embodiment is formed as a single ring that is continuous in the circumferential direction along the inner surface (lower wall surface 335) of the outer peripheral wall 33. The first protrusion 35 of this embodiment has an apex 351 that protrudes radially inward from the other portions at the center in the up-down direction. The apex 351 protrudes a predetermined protrusion height from the inner surface (lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3. As a result, when the outer cap 3 and the inner cap 5 are assembled (FIG. 3), the first protrusion 35 protrudes toward the inner peripheral wall 53 of the inner cap 5. The first protrusion 35 of this embodiment has a substantially triangular cross section, and the apex 351 is formed so as to abut against the outer surface 531 of the inner peripheral wall 53 of the inner cap 5. The protrusion height of the first protrusion 35 is not particularly limited, but may be any height that allows engagement with a second protrusion 503 of the inner cap 5, which will be described later. The top 351 of the first protrusion 35 does not have to be in constant contact with the inner peripheral wall 53. For example, the top 351 may be in contact only when the first protrusion 35 is engaged with a second protrusion 503 of the inner cap 5, which will be described later. Alternatively, the top 351 may be in contact only when the outer cap 3 and the inner cap 5 are moved toward or away from each other.

[0021] The spring portion 37 in this embodiment is formed of a so-called leaf spring. This spring portion 37 is provided so as to protrude diagonally downward from the back surface 313 of the outer ceiling 31. Multiple spring portions 37 are provided along the circumferential direction, and in this embodiment, a total of three spring portions 37 are provided. The spring portion 37 is integrally molded from the same material as the outer ceiling 31 and has a certain degree of elasticity. As a result, when a force is applied to the spring portion 37 in the vertical direction, the spring portion 37 can bend toward the outer ceiling 31. The spring portion 37 is formed in a band shape extending in an arc along the peripheral edge of the outer ceiling 31 in a plan view. The tip portion 371 is formed in a direction protruding toward the closing direction of the cap 1. Furthermore, the spring portion 37 in this embodiment is formed with a predetermined width from the outer ceiling 31 to the tip portion 371. The tip portion 371 is flat and formed at an angle that approximately matches the radial direction of the outer cap 3 in a plan view. Furthermore, when the outer cap 3 is assembled to the inner cap 5 (FIG. 3), the tip 371 of the spring portion 37 abuts against the top surface 511 of the inner ceiling 51. As a result, when the outer cap 3 is rotated relative to the inner cap 5, the tip 371 of the spring portion 37 slides on the top surface 511 of the inner cap 5.

[0022] The protrusions 39 are formed at the corners between the outer ceiling 31 and the outer peripheral wall 33. That is, they protrude downward from the rear surface 313 of the outer ceiling 31 and protrude radially inward from the inner surface (upper wall surface 333) of the outer peripheral wall 33. In this embodiment, multiple protrusions 39 are provided, specifically, six in total, provided at equal intervals in the circumferential direction along the outer peripheral wall 33. In addition, the protrusions 39 in this embodiment are formed in a substantially cubic or rectangular parallelepiped shape. The shape of the protrusions 39 is not limited thereto, and the dimensions and shape are not particularly limited as long as they can be inserted into a recess 571 of the inner cap 5 (described later) and can engage with the recess 571 (described later).

[0023] <Inner cap 5> Fig. 5(a) is a perspective view of the inner cap 5 as seen from the top side, Fig. 5(b) is a perspective view of the inner cap 5 as seen from the bottom side, and Fig. 5(c) is a cross-sectional view of the inner cap 5. The inner cap 5 of this embodiment will be described below with reference to Figs. 5(a) to 5(c). Note that in describing the assembled state of the outer cap 3 and the inner cap 5, the cross-sectional view of Fig. 3 will be referenced as necessary. In addition, in describing the second convex portion 503 and the third convex portion 505 in detail, the enlarged cross-sectional view of Fig. 7 will be referenced as necessary.

[0024] As shown in Figure 5, the inner cap 5 is formed in a cylindrical shape with a top, and includes an inner ceiling 51 and an inner peripheral wall 53 suspended from the periphery of the inner ceiling 51. The end of the container body 101 on the opening 103 side can be inserted into a lower opening 55 formed by the inner ceiling 51 and the inner peripheral wall 53. An inner stopper 7 can be attached inside the inner cap 5.

[0025] The inner ceiling 51 of this embodiment is formed in a circular flat plate shape. The inner peripheral wall 53 of this embodiment is formed in a substantially cylindrical shape. The outer surface 531 of the inner peripheral wall 53 is provided substantially vertically, and is provided with a second protrusion 503 that can engage with the first protrusion 35 of the outer cap 3. Furthermore, a third protrusion 505 is formed above the second protrusion 503. An upper peripheral wall 57 that is formed to rise from the peripheral edge of the inner ceiling 51 is provided at the top of the inner peripheral wall 53. A recess 571 is formed by cutting out a portion of the upper end of the upper peripheral wall 57.

[0026] The inner surface 533 of the inner peripheral wall 53 is provided with a threaded portion 535 that can be threadedly engaged with the threaded portion 107 of the container body 101. A recessed portion 537 for accommodating the inside plug 7 is provided on the inside surface 533 above the threaded portion 535, directly below the inner ceiling 51. The recessed portion 537 is formed by recessing a portion of the inside surface 533 radially outward, forming a single continuous ring along the circumferential direction. The recessed portion 537 in this embodiment has an outer diameter that is approximately the same as or slightly larger than the outer diameter of the body 71 of the inside plug 7. Furthermore, its vertical width is wider than the width of the inside plug 7 in the thickness direction. The inside surface 533 below the recessed portion 537 forms a protruding wall portion 539 that protrudes radially inward beyond the recessed portion 537. Each of these portions will be described in more detail below.

[0027] The second protrusions 503 of this embodiment are formed so as to extend a predetermined length in the circumferential direction along the outer surface 531 of the inner circumferential wall 53. The second protrusions 503 of this embodiment are provided intermittently in the circumferential direction, specifically, a total of four second protrusions 503 are provided at equal intervals in the circumferential direction. The second protrusions 503 of this embodiment are formed so that the ratio of their circumferential length L1 to the distance L2 between adjacent second protrusions 503 is L1:L2 = 5:1. The ratio of the circumferential length L1 to the distance L2 between adjacent second protrusions 503 is not limited to this, and may be in the range of L1:L2 = 5:1 to 1:1.

[0028] The second convex portion 503 protrudes a predetermined protruding height from the outer surface 531 of the inner peripheral wall 53 of the inner cap 5. As a result, when the outer cap 3 and the inner cap 5 are assembled (FIG. 3), the second convex portion 503 protrudes toward the outer peripheral wall 33 of the outer cap 3. The protruding height of the second convex portion 503 is not particularly limited, but it may be higher than the third convex portion 505 described below and may be a height that can engage with the first convex portion 35 of the outer cap 3. Furthermore, it may be approximately the same as or slightly lower than the protruding height of the first convex portion 35 of the outer cap 3.

[0029] As shown in the partially enlarged view of FIG. 5( c), the second protrusion 503 of this embodiment has a substantially trapezoidal cross section. More specifically, a tip 5031 of the second protrusion 503 is substantially parallel to the inner circumferential wall 53. An upper surface 5033 extending from the upper end of the tip 5031 to the inner circumferential wall 53 is inclined relative to the inner circumferential wall 53. A lower surface 5035 extending from the lower end of the tip 5031 to the inner circumferential wall 53 is substantially perpendicular to the inner circumferential wall 53. By inclining the upper surface 5033 of the second protrusion 503 in this manner, the lower surface 355 of the first protrusion 35 slides on the upper surface 5033, making it easier to attach the outer cap 3 to the inner cap 5. Furthermore, by making the lower surface 5035 substantially perpendicular to the inner circumferential wall 53, the engagement force with the first protrusion 35 is further increased.

[0030] As shown in FIG. 5, the third convex portion 505 of this embodiment is formed in the shape of a single continuous band in the circumferential direction along the outer surface 531 of the inner peripheral wall 53. The third convex portion 505 protrudes a predetermined protruding height from the outer surface 531 of the inner peripheral wall 53. As a result, when the outer cap 3 and the inner cap 5 are assembled (FIG. 3), the third convex portion 505 protrudes toward the outer peripheral wall 33 of the outer cap 3. The protruding height of the third convex portion 505 is not particularly limited, but is formed to a height that allows at least a portion of the protruding direction to abut against the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33, and that does not interfere with the up and down movement of the outer cap 3 relative to the inner cap 5. In addition, the protruding height is formed to be lower than that of the second convex portion 503.

[0031] As shown in the partially enlarged view of FIG. 5(c), the third protrusion 505 has a substantially rectangular cross-sectional shape. That is, a tip 5051, which is the tip end of the third protrusion 505 in the protruding direction, is formed flat. The third protrusion 505 is formed so that its vertical width W1 is wider than its protruding width W2. There is no particular limitation on the vertical width W1 of the third protrusion 505, but it is preferable that W1 be in the range of 5 to 7 mm. There is also no particular limitation on the protruding width W2 of the third protrusion 505, but it is preferable that W2 be in the range of 0.1 to 0.2 mm.

[0032] Furthermore, the third convex portion 505 is provided at approximately the same position in the up-down direction on the outer peripheral wall 33 as the position at which the recessed portion 537 is provided. That is, the third convex portion 505 is provided on the outer side of the portion of the inner peripheral wall 53 where the recessed portion 537 is provided. Note that although the third convex portion 505 of this embodiment has a substantially rectangular cross-sectional shape, the cross-sectional shape is not limited to a substantially rectangular shape and may be a square, trapezoid, triangle, other polygon, semicircle, or semi-ellipse. In particular, a square, trapezoid, other polygon, or semi-oval shape in which the protruding tip side is formed flat is preferred.

[0033] As shown in FIG. 5 , the upper peripheral wall 57 is provided continuously in the circumferential direction along the periphery of the inner ceiling 51. A portion of the upper end of the upper peripheral wall 57 is cut out to form recesses 571 that constitute the first engagement means. A plurality of recesses 571 are provided at equal intervals along the circumferential direction of the upper peripheral wall 57, and in this embodiment, a total of six recesses 571 are provided. In this embodiment, the recesses 571 are formed by cutting out a generally rectangular shape with a predetermined width and a predetermined height in the circumferential direction. There are no particular restrictions on the width and height, as long as they are large enough to allow the protrusion 39 of the outer cap 3 to be inserted and to be able to engage with the inserted protrusion 39.

[0034] A protrusion 515 is provided on the top surface 511 of the inner ceiling 51. The protrusions 515 are arranged at equal intervals around the periphery of the inner ceiling 51, and a total of six are provided in this embodiment. In this embodiment, the protrusions 515 are formed in a rectangular shape extending along the diameter direction of the inner ceiling 51 in a plan view. More specifically, the protrusions 515 are arranged along a path along which the tip 371 of the spring portion 37 moves when the outer cap 3 is rotated relative to the inner cap 5. As a result, when the outer cap 3 is rotated in the opening direction without being brought close to the inner cap 5, the tip 371 of the spring portion 37 moves while climbing over the protrusion 515. Furthermore, when the outer cap 3 is rotated in the closing direction, the tip 371 of the spring portion 37 abuts against and engages with the protrusion 515.

[0035] A convex rib portion 517 is provided on the top surface 511 of the inner ceiling 51. The convex rib portion 517 is formed as two rails extending parallel to each other in a concentric pattern when viewed from the center of the inner ceiling 51. In this embodiment, the convex rib portion 517 is formed so as to extend a predetermined length in the closing rotation direction from the tip of the protrusion 515 in the closing rotation direction. The tip portion 371 of the spring portion 37 abuts against the convex rib portion 517. This reduces the frictional resistance between the tip portion 371 of the spring portion 37 and the inner ceiling 51, allowing the spring portion 37 to slide smoothly.

[0036] A ring 59 having a tamper-evident function is provided at the lower part of the inner peripheral wall 53. The ring 59 is an annular member formed with approximately the same outer diameter as the inner peripheral wall 53 and is connected to the lower end of the inner peripheral wall 53 via a connecting portion 591. The connecting portion 591 is a member provided to connect the upper end of the ring 59 to the lower end of the inner peripheral wall 53 and is formed to break when a predetermined force is applied when the cap 1 is opened. A gap 593 having a height equal to the connecting portion 591 is formed between the upper end of the ring 59 and the lower end of the inner peripheral wall 53. In addition, a protrusion 595 is provided on the inner peripheral surface of the ring 59 so as to protrude radially inward. When the cap 1 is attached to the peripheral wall 105 of the container body 101, the protrusion 595 engages with a protrusion 109 ( FIG. 1 ) provided on the lower part of the peripheral wall 105. In this way, engagement with the protrusion 109 restricts rotation of the ring 59 in the opening direction. As a result, when force is applied to cap 1 in the opening direction, the stress on protrusion 109, whose rotation is restricted, is concentrated on connection part 591, causing it to break as if it were to be torn off. Furthermore, a pair of breakage prevention parts 597 are provided on the upper end of ring 59 and the lower end of inner circumferential wall 53 to prevent connection part 591 from accidentally breaking if a force greater than a certain level is applied to cap 1 when it is closed.

[0037] The method of attaching the inner cap 5 to the outer cap 3 is as follows. First, the inner cap 5 is placed in the opening 301 of the outer cap 3 so that the inner ceiling 51 of the inner cap 5 faces the back surface 313 of the outer ceiling 31 of the outer cap 3. Then, the inner cap 5 is pushed into the opening 301 of the outer cap 3 from the inner ceiling 51 side. Insertion is continued in this manner until the first protrusion 35 of the outer cap 3 passes over the second protrusion 503 of the inner cap 5 and the first protrusion 35 and the second protrusion 503 engage with each other, completing the attachment.

[0038] <Inner stopper 7> Fig. 6(a) is a perspective view of the inside plug 7 as seen from the top side, Fig. 6(b) is a perspective view of the inside plug 7 as seen from the bottom side, and Fig. 6(c) is a cross-sectional view of the inside plug 7. The inside plug 7 of this embodiment will be described below with reference to Figs. 6(a) to 6(c). Note that in describing the state in which the inside plug 7 is assembled to the inner cap 5, the cross-sectional view of Fig. 3 will be referred to as needed.

[0039] The inside plug 7 can seal the opening 103 of the container body 101. As shown in FIG. 6, the inside plug 7 of this embodiment includes a main body 71 formed in the shape of a circular flat plate and a protruding portion 73 protruding downward from the bottom surface of the main body 71. The protruding portion 73 is formed slightly inward of the peripheral edge portion 711 of the inside plug 7 and is formed in a cylindrical shape that is continuous in the circumferential direction. The main body 71 is formed to have an outer diameter that is approximately the same as or slightly smaller than the inner diameter of the portion of the inner cap 5 where the recess 537 is formed. In addition, the width in the thickness direction of the main body 71 is formed to be thinner than the width of the recess 537 in the up-down direction.

[0040] As shown in FIG. 3 , the inside plug 7 is attached to the inner cap 5 so that the top surface 713 of the main body 71 is aligned with the back surface 513 of the inner ceiling 51 of the inner cap 5. In this embodiment, the main body 71 is attached to the inner cap 5 with its peripheral edge 711 inserted into the recess 537. Furthermore, the protruding portion 73 is inserted into the opening 103 of the container body 101 with the cap 1 attached to the container body 101. In this state, the main body 71 contacts the open end of the container body 101. The outer diameter of the protruding portion 73 is formed to be larger than the inner diameter of the opening 103 of the container body 101. As a result, when the protruding portion 73 is inserted into the opening 103, the outer portion of the protruding portion 73 comes into close contact with the inner circumferential surface of the opening 103. As a result, the opening 103 is sealed.

[0041] The inner plug 7 of this embodiment is attached with the peripheral edge 711 abutting or nearly abutting the recess 537. When the cap 1 is opened or closed, the protruding portion 73 is pulled out of or press-fit into the opening 103 of the container body 101. At this time, stress may be applied to the recess 537 of the inner cap 5 via the protruding portion 73. However, a third protruding portion 505 is provided on the outer side of the inner circumferential wall 53 at the portion where the recess 537 is provided. As described below, the third protruding portion 505 abuts and supports the outer circumferential wall 33 of the outer cap 3, and therefore, elastic deformation can be suppressed even when stress is applied from the recess 537 side. Note that in this specification, "nearly abutting" does not mean a state in which two members are completely abutting each other, but rather a state in which a slight gap is allowed between them.

[0042] The method of attaching the inside plug 7 to the inner cap 5 is as follows. First, the inside plug 7 is positioned so that the top surface 713 of the main body 71 faces the back surface 513 of the inner ceiling 51 in the opening 55 of the inner cap 5. Then, the inside plug 7 is pushed into the opening 55 of the inner cap 5. The periphery 711 of the main body 71 passes over the protruding wall 539 between the threaded portion 535 and the recessed portion 537 and is inserted into the recessed portion 537, thereby completing the attachment.

[0043] It should be noted that an elastic plate-shaped packing may be separately provided between the main body 71 and the inner ceiling 51 of the inner cap 5. By providing a packing between the main body 71 and the inner ceiling 51 of the inner cap 5, the sealing performance can be further improved.

[0044] <Effects of the first protrusion 35 and the second protrusion 503> Figure 7(a) shows a state in which the first convex portion 35 of the outer cap 3 and the second convex portion 503 of the inner cap 5 are engaged with each other. Figure 7(b) shows a state in which the first convex portion 35 and the second convex portion 503 are disengaged. Below, the effects of the first convex portion 35 and the second convex portion 503 will be described with reference to Figures 7(a) and 7(b).

[0045] The outer cap 3 receives a force in a direction away from the inner cap 5 due to the biasing force of the spring portion 37. That is, the first protrusion 35 of the outer cap 3 receives a force in an upward direction. In the state shown in FIG. 7( a), the upper surface 353 of the first protrusion 35 abuts the lower surface 5035 of the second protrusion 503. The first protrusion 35 and the second protrusion 503 are provided at protruding heights that make it difficult for them to overcome each other. As a result, the first protrusion 35 and the second protrusion 503 are engaged with each other. That is, the first protrusion 35 engages with the second protrusion 503, restricting further movement of the outer cap 3 in a direction away from the inner cap 5. This prevents the outer cap 3 from coming off the inner cap 5. Note that, when the first protrusion 35 and the second protrusion 503 are engaged with each other, the outer cap 3 does not necessarily receive a biasing force in a direction away from the inner cap 5. That is, the first convex portion 35 and the second convex portion 503 may be engaged with the spring portion 37 in a fully extended state as long as the tip portion 371 of the spring portion 37 is in contact with the convex strip portion 517. In this case, in this engaged state, no biasing force acts in the separating direction between the inner cap 5 and the outer cap 3, but when an external force is applied in a direction that brings them closer together, a biasing force in the separating direction is generated by the action of the spring portion 37.

[0046] Next, we will explain what happens when the outer cap 3 receives an external force pressing it toward the inner cap 5. When a force is applied to the outer ceiling 31 of the outer cap 3 in a direction that moves it closer to the inner ceiling 51 of the inner cap 5, the spring portion 37 elastically deforms in a compression direction, and the outer cap 3 moves closer to the inner cap 5 in the vertical direction. As a result, as shown in FIG. 7(b), the outer peripheral wall 33 also moves downward within a predetermined range in terms of its relative positional relationship with the inner peripheral wall 53. As a result, the first protrusion 35 also moves downward and separates from the second protrusion 503, thereby disengaging them. Note that when the pressure on the outer cap 3 is released in this state, the compressed spring portion 37 returns to its original state due to its elastic force, and the outer cap 3 moves in a direction away from the inner cap 5. Then, the first protrusion 35 re-engages with the second protrusion 503. This restricts the outer cap 3 from moving in the separation direction.

[0047] As described above, the first convex portion 35 is formed continuously in the circumferential direction along the inner surface (lower wall surface 335) of the outer peripheral wall 33. The protruding apex 351 abuts or nearly abuts against the outer surface 531 of the inner peripheral wall 53 of the inner cap 5, thereby closing the gap between the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3 and the outer surface 531 of the inner peripheral wall 53 of the inner cap 5. As a result, it is possible to prevent liquid or other foreign matter from entering between the outer cap 3 and the inner cap 5 through such gap.

[0048] As described above, the second protrusions 503 are formed intermittently in the circumferential direction along the outer surface 531 of the inner circumferential wall 53. In this manner, the second protrusions 503 are formed discontinuously with gaps (gaps) in the circumferential direction. As a result, the gaps between adjacent second protrusions 503 serve as air escape routes. This allows air to escape through the gaps, enabling smooth vertical movement of the outer cap 3 and the inner cap 5, for example, when the outer cap 3 and the inner cap 5 are moved relative to each other. Furthermore, because the second protrusions 503 are formed discontinuously in the circumferential direction, the elastic deformation of the inner circumferential wall 53 is less likely to be hindered. This makes it easier to fit the inner cap 5 inside the outer cap 3. Furthermore, the second convex portion 503 itself has a sealing function, and in combination with the first convex portion 35, it can prevent liquids and other foreign matter from entering through the gap between the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3 and the outer surface 531 of the inner peripheral wall 53 of the inner cap 5.

[0049] <Effects of the third protrusion 505> Next, the effect of the third protrusion 505 will be described with reference to FIGS. 7( a) and 7(b). When the first protrusion 35 and the second protrusion 503 are engaged as shown in FIG. 7(a), the corner 5053 of the third protrusion 505 on the tip 5051 side in the protruding direction abuts or nearly abuts the lower wall surface 335. When the outer cap 3 is pressed down against the inner cap 5 as shown in FIG. 7(b), the third protrusion 505 moves upward relative to the outer peripheral wall 33. During this process, the third protrusion 505 moves while the corner 5053 on the upper side thereof slides against the lower wall surface 335. When the corner 5053 of the third protrusion 505 reaches the position of the bent portion 337, it moves over the bent portion 337. After overcoming the bent portion 337, the third protrusion 505 abuts or nearly abuts the upper wall surface 333. Here, "going over the bent portion 337" does not only mean that the entire third convex portion 505 is located on the upper wall surface 333 side above the bent portion 337, but also that the third convex portion 505 is located partially on the upper wall surface 333 side above the bent portion 337. For example, as shown in FIG. 7(b), only a part of the third convex portion 505 on the corner portion 5053 side may be located on the upper wall surface 333 side above the bent portion 337.

[0050] As described above, the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3 is tapered so that its inner diameter gradually increases from the upper end to the lower end. The outer surface 531 of the inner peripheral wall 53 of the inner cap 5 is formed in a substantially vertical direction, that is, at a gentle angle with respect to the vertical direction. Therefore, the width of the gap W3 between the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 and the outer surface 531 of the inner peripheral wall 53 gradually narrows from the bottom to the top of the outer peripheral wall 33 and the inner peripheral wall 53.

[0051] When the third protrusion 505 of the inner cap 5 has its corner 5053 in contact with the lower wall surface 335 ( FIG. 7( a) ), sliding resistance occurs when the third protrusion 505 moves upward relative to the outer peripheral wall 33. In particular, the lower wall surface 335 is formed with a greater inclination in the up-down direction than the upper wall surface 333, and therefore the rate at which the gap W3 between the lower wall surface 335 and the outer surface 531 of the inner peripheral wall 53 narrows also increases. As a result, the sliding resistance generated between the third protrusion 505 and the outer peripheral wall 33 is higher at the lower wall surface 335, which has a greater inclination. Furthermore, the inclination angle of the upper wall surface 333 is smaller, and therefore the degree of sliding resistance is relatively low.

[0052] In this way, a certain amount of sliding resistance occurs in the third convex portion 505 when it moves upward from the lower wall surface 335 until it overcomes the bent portion 337. This frictional resistance complements the elastic force of the spring portion 37. This allows the spring portion 37 to obtain an appropriate elastic force without being made more rigid than necessary. It also reduces the load on the spring portion 37, thereby extending the life of the spring portion 37. Furthermore, since the sliding resistance is relatively small on the upper wall surface 333, it becomes possible to more smoothly bring the outer cap 3 close to the inner cap 5 up to a predetermined distance.

[0053] Furthermore, the third protrusion 505 can support the outer peripheral wall 33 by abutting a part of its tip side against the upper wall surface 333 or the lower wall surface 335 of the outer peripheral wall 33 of the outer cap 3. This can prevent radial displacement or rattle between the outer cap 3 and the inner cap 5.

[0054] As described above, the third protrusion 505 is formed in the shape of a single continuous band in the circumferential direction along the outer surface 531 of the inner peripheral wall 53. A portion of its tip side abuts or nearly abuts against the upper wall surface 333 or the lower wall surface 335 of the outer peripheral wall 33 of the outer cap 3, thereby closing the gap between the inner surface (upper wall surface 333, lower wall surface 335) of the outer peripheral wall 33 of the outer cap 3 and the outer surface 531 of the inner peripheral wall 53 of the inner cap 5. As a result, it is possible to prevent liquid or other foreign matter from entering between the outer cap 3 and the inner cap 5 through such gap.

[0055] The first convex portion 35 and the second convex portion 503 described above also have the effect of sealing the gap with the outer surface 531 of the inner peripheral wall 53 of the inner cap 5, and this, combined with the sealing function of the third convex portion 505 described above, further improves the sealing performance between the outer cap 3 and the inner cap 5. In particular, when the outer cap 3 and the inner cap 5 are moved in the direction toward each other, the first convex portion 35 and the second convex portion 503 move away from each other. This may temporarily reduce the sealing performance provided by the first convex portion 35 and the second convex portion 503, but since the third convex portion 505 is located further inward (toward the inner ceiling 51) than the second convex portion 503, it is possible to prevent foreign matter from entering.

[0056] <Opening and closing operation of cap 1> Here, the operation of opening (removing) the cap 1 of this embodiment will be described. First, the cap 1 of this embodiment has the CR function as described above. More specifically, in the opening operation of the cap 1, the cap 1 is opened on the condition that it receives a force pushing the outer cap 3 toward the inner cap 5. Below, we will explain separately the case where the outer cap 3 does not receive a force pushing it toward the inner cap 5 and the case where it does receive a force pushing it. Note that a prerequisite for each case is that the inner cap 5 is fixed to the container body 101 by screwing it together.

[0057] First, we will explain the case where there is no force pushing the outer cap 3 toward the inner cap 5. In this case, the outer cap 3 is not pushed toward the inner cap 5, but is simply rotated in the opening direction. In other words, this is a situation in which a weak person such as a small child is rotating the cap 1 in the opening direction. At this time, the tip 371 of the spring portion 37 faces away from the direction of rotation. Therefore, the tip 371 of the spring portion 37 rotates while sliding against the protruding portion 517 of the inner ceiling 51. Then, when the tip 371 reaches just before the protrusion 515, the underside of the spring portion 37 abuts against the protrusion 515.

[0058] When the spring portion 37 is further rotated with its lower surface abutting against the protrusion 515, the protrusion 515 pushes the spring portion 37 up from below, causing elastic deformation. The elastically deformed spring portion 37 can then overcome the protrusion 515. In this way, only the outer cap 3 rotates relative to the inner cap 5, creating a so-called free-spinning state. As a result, the cap 1 cannot be opened.

[0059] A case where the outer cap 3 is subjected to a force pushing it toward the inner cap 5 will be described. In this case, the cap 1 is opened as follows. First, the outer cap 3 is pushed downward so that the outer ceiling 31 approaches the inner ceiling 51. Specifically, the outer cap 3 is rotated and pushed in the opening direction until the protrusion 39 of the outer cap 3 is inserted into the recess 571 of the inner cap 5. Then, as the cap 1 is further rotated in the opening direction while maintaining this state, the protrusion 39 moves to the edge of the recess 571 and abuts against the side edge of the upper peripheral wall 57. As the outer cap 3 is further rotated in the opening direction while the protrusion 39 abuts against the side edge of the upper peripheral wall 57, the protrusion 39 engages with the recess 571. As a result, the rotational force of the outer cap 3 is transmitted directly to the inner cap 5, and both rotate together. This allows the cap 1 to be rotated in the opening direction. As a result, the cap 1 is opened.

[0060] Next, the operation of the capping operation (attachment) of the cap 1 of this embodiment will be described. First, the outer cap 3 is rotated in the capping direction. At this time, the tip 371 of the spring portion 37 faces the rotation direction. Then, the tip 371 rotates while sliding against the top surface 511 of the inner ceiling 51. When the tip 371 reaches the position of the protrusion 515, the tip 371 abuts against the protrusion 515, and further movement is restricted. Then, when the tip 371 abuts against the protrusion 515, a force is applied to the spring portion 37 from the tip 371 to the base. That is, the tip 371 of the spring portion 37 abuts against the protrusion 515 and becomes stretched. When the outer cap 3 is further rotated in the capping direction in this state, the tip 371 of the spring portion 37 pushes the protrusion 515, causing the inner cap 5 to rotate in the capping direction.

[0061] <Variation 1> Fig. 8 is a view corresponding to Fig. 7(a) of the cap 10 of Modification 1. As shown in Fig. 8, in the cap 10 of Modification 1, a second convex portion 5010 is formed on an outer surface 5310 of an inner circumferential wall 530 of the inner cap 50. Meanwhile, a member corresponding to the third convex portion 505 in the first embodiment is not formed on the outer surface 5310. In contrast, a first convex portion 350 is provided on a lower end portion of an inner surface 3350 of an outer circumferential wall 330 of the outer cap 30. Then, above the first convex portion 350 and below the bent portion 3370, a fourth convex portion 3390 is provided that protrudes toward the outer surface 5310 of the inner circumferential wall 530.

[0062] The fourth protrusion 3390 is formed in a strip shape that extends continuously in the circumferential direction of the inner surface 3350 of the outer peripheral wall 330. The tip 3391 of the fourth protrusion 3390 is in contact or nearly in contact with the outer surface 5310 of the inner peripheral wall 330. This makes it possible to support the outer peripheral wall 330 from the inside, and to prevent radial misalignment or rattle between the outer cap 30 and the inner cap 50.

[0063] Furthermore, the tip portion 3391 abuts or nearly abuts against the outer surface 5310 of the inner peripheral wall 530, thereby closing the gap between the inner surfaces 3330, 3350 of the outer cap 30 and the outer surface 5310 of the inner cap 50. As a result, it is possible to prevent liquids and other foreign matter from entering between the outer cap 30 and the inner cap 50 through such gap.

[0064] Furthermore, the fourth convex portion 3390 is formed on the inclined inner surface 3350. The mating outer surface 5310 that it abuts against is formed substantially vertically. Therefore, even when the fourth convex portion 3390 moves in the up-down direction, the sliding resistance between it and the outer surface 5310 is kept constant. This allows the outer cap 30 of Modification 1 to move more smoothly toward or away from the inner cap 50 (in the up-down direction).

[0065] Furthermore, the fourth convex portion 3390 moves relatively downward and abuts against the second convex portion 5010, thereby restricting further downward movement. That is, by adjusting the position of the fourth convex portion 3390 in the up-down direction of the outer peripheral wall 330, the downward movement distance of the fourth convex portion 3390 can be set within a predetermined range. This makes it possible to set a limit to how close the outer cap 30 can approach the inner cap 50, for example, and to prevent the spring portion 37 from being subjected to an excessive load.

[0066] <Variation 2> FIG. 9(a) is a schematic diagram illustrating the first convex portion 35a, the second convex portion 501a, and the third convex portion 503a in Modification 2. As shown in the figure, the third convex portions 503a in Modification 2 are formed intermittently along the circumferential direction. That is, multiple third convex portions 503a are arranged at predetermined intervals along the circumferential direction. By forming the third convex portions 503a discontinuously along the circumferential direction in this manner, the inner circumferential wall at the portion where the third convex portions 503a are provided is more likely to elastically deform. As a result, the assembly work of the outer cap 3 and the inner cap 5 in Modification 2 is smooth. In addition, the space between adjacent third convex portions 503a forms an air flow path. As a result, when the outer cap 3 and the inner cap 5 are moved relatively toward or away from each other, air escapes from the third convex portions 503a, allowing for smooth movement.

[0067] <Variation 3> FIG. 9(b) is a schematic diagram illustrating the first protrusions 35b, the second protrusions 501b, and the third protrusions 503b in Modification 3. As shown in the figure, the first protrusions 35b in Modification 3 are formed intermittently along the circumferential direction. That is, multiple first protrusions 35b are arranged at predetermined intervals along the circumferential direction. By forming the first protrusions 35b discontinuously along the circumferential direction in this manner, the outer peripheral wall at the portion where the first protrusions 35b are provided is more likely to elastically deform. This facilitates the assembly of the outer cap 3 and the inner cap 5 in Modification 3. Furthermore, the space between adjacent first protrusions 35b serves as an air flow path. This allows air to escape from the first protrusions 35b when the outer cap 3 and the inner cap 5 are moved toward or away from each other, allowing for smooth movement.

[0068] <Variation 4> FIG. 9(c) is a schematic diagram illustrating the first convex portion 35c, the second convex portion 501c, and the third convex portion 503c in Modification 4. As shown in the figure, the third convex portions 503c in Modification 4 are formed intermittently along the circumferential direction. That is, multiple third convex portions 503c are arranged at predetermined intervals along the circumferential direction. By forming the third convex portions 503c discontinuously along the circumferential direction in this manner, the space between adjacent third convex portions 503c becomes an air flow path. As a result, when the outer cap 3 and the inner cap 5 are moved relatively toward or away from each other, air escapes from the third convex portions 503c, allowing for smooth movement.

[0069] Furthermore, in Modification 4, the first protrusion 35c and the second protrusion 501c are provided continuously and seamlessly in the circumferential direction. By forming the first protrusion 35c and the second protrusion 501c continuously in the circumferential direction in this manner, the engagement between the two is more reliable. Furthermore, by having the first protrusion 35c abut or nearly abut against the inner peripheral wall and the second protrusion 501c abut against the outer peripheral wall, the sealing performance of the gap between the outer cap 3 and the inner cap 5 is further improved.

[0070] <Other variations> In other modified container caps, the CR function may be realized in different ways. For example, an elastic body other than a spring may be provided as a biasing means for biasing the outer cap 3 and the inner cap 5 in a direction separating them from each other. The tamper-evident function may also be realized in different ways. For example, a seal may be affixed to connect the cap and the container body, and the seal may be broken when the cap is opened to ensure the integrity of the opening.

[0071] Although various embodiments and modifications have been described above, it is of course possible to combine these embodiments and modifications. Furthermore, the present disclosure is not limited to the above-described embodiments, and can be implemented in various forms without departing from the gist of the present disclosure. [Explanation of symbols]

[0072] 1...cap, 3...outer cap, 5...inner cap, 7...internal plug, 33...outer peripheral wall, 35...first convex portion, 37...spring portion, 39...projection portion, 53...inner peripheral wall, 57...upper peripheral wall, 503...second convex portion, 505...third convex portion, 515...projection portion, 571...recess

Claims

1. an inner cap formed to be able to seal the opening of the container and having an inner ceiling and an inner peripheral wall extending downward from an edge of the inner ceiling; an outer cap attached to the inner cap so as to be movable relative to the inner cap at a position covering the inner cap, the outer cap having an outer ceiling covering the inner ceiling and an outer peripheral wall extending downward from an edge of the outer ceiling and covering at least a portion of the inner peripheral wall; a biasing means provided between the outer ceiling and the inner ceiling for biasing the outer ceiling and the inner ceiling in a direction separating the outer ceiling and the inner ceiling; A cap comprising: a first protrusion extending in a circumferential direction on an inner surface of the outer peripheral wall of the outer cap and protruding toward the inner peripheral wall; a second protrusion is formed on the outer surface of the inner peripheral wall of the inner cap, the second protrusion extending along the circumferential direction of the outer surface closer to the outer ceiling than the first protrusion, protruding toward the outer peripheral wall, and overlapping with the first protrusion when the outer ceiling and the inner ceiling are spaced apart by a predetermined distance; A third protrusion is formed on one of the outer surface of the inner peripheral wall and the inner surface of the outer peripheral wall, extending along the circumferential direction closer to the outer ceiling than the second protrusion and protruding toward the other of the outer surface of the inner peripheral wall and the inner surface of the outer peripheral wall. cap.

2. a first engaging means for engaging the outer cap with the inner cap when the outer cap is rotated in an opening direction with the outer ceiling and the inner ceiling being close to each other at a predetermined distance; a second engaging means for engaging the outer cap with the inner cap when the outer cap is rotated in a closing direction; The cap of claim 1 .

3. The cap according to claim 1 or 2, wherein the first protrusion is formed continuously along the circumferential direction.

4. The cap according to claim 1 or 2, wherein the second protrusions are formed in plurality at predetermined intervals along the circumferential direction.

5. The cap according to claim 1 or 2, wherein the third protrusion is formed continuously along the circumferential direction.

6. 3. The cap according to claim 1, wherein the third protrusion is formed to have a lower protrusion height than the second protrusion.

7. The cap according to claim 1 or 2, wherein the first protrusion is provided at an end of the outer peripheral wall opposite to an end on the outer ceiling side.

8. 3. The cap according to claim 1, wherein the inner surface of the outer peripheral wall is inclined so that the inner diameter of the outer peripheral wall increases from the end on the outer ceiling side to the opposite end.

9. The outer peripheral wall includes an upper wall surface and a lower wall surface, the inner surfaces of which have different inclination angles, 9. The cap according to claim 8, wherein the lower wall surface has a larger inclination angle with respect to the vertical direction than the upper wall surface.

10. A first engaging means is provided for engaging the outer cap with the inner cap when the outer cap is rotated in the opening direction with the outer ceiling of the outer cap and the inner ceiling of the inner cap close to each other at a predetermined distance, When the outer cap and the inner cap are engaged by the first engaging means, at least a part of the third protrusion abuts or nearly abuts on the upper wall surface. The cap of claim 9.

11. an inner plug formed to be able to seal the opening of the container is provided inside the inner cap; The inner plug has a disk-shaped main body provided along the back surface of the inner ceiling, and a protrusion protruding from the main body and insertable into the opening, 3. The cap according to claim 1, wherein a recess capable of receiving a peripheral portion of the body of the inside plug is formed on the inner surface of the inner peripheral wall.

12. The cap according to claim 11, wherein the third protrusion is provided on an outer surface of the inner peripheral wall at a portion where the recess is provided.

13. The cap according to claim 1 or 2, wherein the third protrusions are formed in plurality at predetermined intervals along the circumferential direction.

14. The cap according to claim 1 or 2, wherein the first protrusions are formed in plurality at predetermined intervals along the circumferential direction.

15. The cap according to claim 1 or 2, wherein the second protrusion is formed continuously along the circumferential direction.

16. an inner cap formed to be able to seal the opening of the container and having an inner ceiling and an inner peripheral wall extending downward from an edge of the inner ceiling; an outer cap attached to the inner cap so as to be movable relative to the inner cap at a position covering the inner cap, the outer cap having an outer ceiling covering the inner ceiling and an outer peripheral wall extending downward from an edge of the outer ceiling and covering at least a portion of the inner peripheral wall; A cap comprising: a biasing means provided between the outer ceiling and the inner ceiling and biasing the outer ceiling and the inner ceiling in a direction separating the outer ceiling and the inner ceiling, a first protrusion extending in a circumferential direction on an inner surface of the outer peripheral wall, protruding toward an outer surface of the inner peripheral wall, and abutting against the outer surface; a second protrusion extending in the circumferential direction on the outer surface of the inner peripheral wall closer to the outer ceiling than the first protrusion, protruding toward the inner surface of the outer peripheral wall, and abutting against the inner surface; a third protrusion portion is formed on either the inner surface of the outer peripheral wall or the outer surface of the inner peripheral wall, the third protrusion portion extending along the circumferential direction on the outer ceiling side of the outer peripheral wall and protruding toward the inner surface of the outer peripheral wall or the outer surface of the inner peripheral wall; The inner surface of the outer peripheral wall includes an upper wall surface and a lower wall surface that are inclined at different inclination angles so that the inner diameter of the outer peripheral wall widens from the end on the outer ceiling side to the opposite end, The lower wall surface is formed at a larger inclination angle with respect to the vertical direction than the upper wall surface, When the outer ceiling and the inner ceiling are spaced apart from each other within a predetermined range, the third protrusion abuts or nearly abuts against the lower wall surface, When the outer ceiling and the inner ceiling are in close proximity to each other within a predetermined range, the third protrusion abuts or nearly abuts against the upper wall surface. cap.

17. A container having the cap according to claim 1 or 16 removably attached to an opening thereof.

Images