Cap for container with opening / closing counter function

Abstract

To provide a cap for a container having an opening / closing counter function that does not change the display when the cap is opened, but changes the display surely when the cap is closed.SOLUTION: A cap for a container with an opening / closing counter function has: an inner cap 2; an outer cap 3 rotatably attached within a predetermined rotation angle range; and a counter member 4. The counter member 4 has n display areas and n one-way locking portions 42 provided at each angle corresponding to 1 / n rotations. The outer cap 3 includes: an engaging portion 33 that engages with the one-way locking portions 42 during an opening operation and passes over the one-way locking portions 42 during a closing operation; and a display window 31 that displays one of the n display areas. The rotation angle at which the inner cap 2 and the outer cap 3 can rotate relative to each other is set to be larger than the angle corresponding to 1 / n rotation.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cap for a container having an opening / closing counter function, in which the display changes depending on the opening or closing operation. [Background technology]

[0002] A conventional container cap of this type having an opening / closing counter function is known from Patent Document 1 below.

[0003] The date display cap for a medicine bottle disclosed in Figures 1 to 4 of Patent Document 1 comprises an inner cap (20) that threads onto the mouth of the bottle, an outer cap (10) that is rotatably attached to the inner cap (20) within a predetermined angular range, and a date display dial (30) that is installed on the inner cap (20). The opposing surfaces of the date display dial (30) and the inner cap (20) are formed with friction edges (25, 35) consisting of numerous projections and recesses that generate frictional resistance. An elastic protrusion (13) is provided on the underside of the top plate of the outer cap (10).

[0004] When a user rotates outer cap (10) in one direction relative to inner cap (20) to remove medicine from the medicine bottle, protrusion (12) of outer cap (10) moves from the left end to the right end within protrusion groove (22) of inner cap (20), and elastic protrusion (13) constituting the ratchet mechanism rotates in one direction relative to date display dial (30). At this time, frictional resistance generated at friction ends (25, 35) prevents date display dial (30) from rotating relative to inner cap (20). As a result, the date displayed in display window (11) of outer cap (10) automatically changes (see paragraph 0037).

[0005] On the other hand, when outer cap (10) is rotated in the reverse direction to close the medicine bottle, protrusion (12) of outer cap (10) moves from the right end to the left end within protrusion groove (22) of inner cap (20). At this time, engaging pressing end (13c) of elastic protrusion (13) engages with partition end (32) of date display dial (30), overcoming the frictional resistance generated by friction ends (25, 35) and rotating date display dial (30) relative to inner cap (20) in conjunction with outer cap (10) (see paragraph 0039). At this time, the date displayed in display window (11) does not change.

[0006] The date display cap for a medicine bottle disclosed in Figures 5 to 13 of Patent Document 1 has an inner cap (120) that is screwed onto the mouth of the bottle, an outer cap (110) that is attached to the inner cap (120) so as to be rotatable within a predetermined angular range, and a date display tube (130) that is provided between the inner cap (120) and the outer cap (110).

[0007] Ratchet mechanisms (160, 170) are provided between the outer cap (110) and the date display tube (130), so that when the outer cap (110) is rotated in the opening direction, the outer cap (110) can rotate relative to the date display tube (130), and when the outer cap (110) is rotated in the closing direction, the date display tube (130) rotates in conjunction with the outer cap (110). As a result, when the outer cap (110) is rotated in the opening direction, the date displayed in the display window (111) of the outer cap (110) automatically changes, and when it is rotated in the closing direction, the displayed date does not change.

[0008] A ratchet mechanism (180, 190) is also provided between the inner cap (120) and the date display tube (130), which restricts the relative rotation of the date display tube (130) with respect to the inner cap (120) so that the date display tube (130) does not move in conjunction with the outer cap (110) when the outer cap (110) is rotated in the direction of opening, and allows the date display tube (130) to rotate relative to the inner cap (120) so that it moves in conjunction with the outer cap (110) when the outer cap (110) is rotated in the direction of closing.

[0009] The angular range within which the outer cap (10, 110) can rotate relative to the inner cap (20, 120) is set equal to the angle between adjacent display ends (31, 131) of the date display section (30, 130), as is clear from Figures 3a to 3c and Figure 11 of Patent Document 1. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Patent No. 5782191 Summary of the Invention [Problem to be solved by the invention]

[0011] Both of the two configurations disclosed in Patent Document 1 are configured to change the display when the outer cap is opened, so by the time the cap is opened and the medicine is taken out, the display has already changed, which may cause confusion for the user.

[0012] On the other hand, in the configuration of Patent Document 1, if the direction of the ratchet mechanism is reversed, the display does not change when the cap is opened, but appears to change when the cap is closed.

[0013] However, in the case of the configuration of the first embodiment of Patent Document 1, the rotational operating force when opening the outer cap (10) is not as great as when closing it, and therefore the small torque generated in the inner cap (20) when opening the outer cap (10) is not enough to overcome the frictional resistance force caused by the friction edge and sufficiently rotate the date display dial (30) relative to the inner cap (20), which may result in the display not changing even if the outer cap is then closed.

[0014] Furthermore, even in the configuration of the second embodiment of Patent Document 1, when the outer cap (10) is opened, the rotational torque of the date display tube (130) relative to the inner cap (120) becomes insufficient, and before the third latch end (180) of the ratchet mechanism between the inner cap (120) and the date display tube (130) completely overcomes the fourth latch end (190), the inner cap (120) and the date display tube (130) rotate together with the outer cap (110), and even if the outer cap (110) is then closed, the display may not change and may return to its original state.

[0015] To provide a cap for a container having an opening / closing counter function that does not change the display when the cap is opened, but changes the display reliably when the cap is closed. [Means for solving the problem]

[0016] The container cap having an opening / closing counter function according to the present invention may comprise an inner cap attached to the container mouth, an outer cap attached to the inner cap so as to be rotatable relative to the inner cap within a predetermined rotation angle range, and a counter member arranged between the inner cap and the outer cap so as to be rotatable relative to the outer cap.

[0017] The counter member may have n display areas (where n is an integer of 2 or more; more preferably, n is an integer of 3 or more) arranged circumferentially, and n one-way locking portions spaced circumferentially at angles corresponding to 1 / n rotation.

[0018] The outer cap may be provided with an engagement portion that engages with the one-way locking portion when rotated in the opening direction and that overcomes the one-way locking portion when rotated in the closing direction, and a display window that displays one of the n display areas according to the current rotational position of the counter member relative to the outer cap.

[0019] The rotation angle at which the inner cap and the outer cap can rotate relative to each other is preferably greater than the angle corresponding to the 1 / n rotation. [Effects of the Invention]

[0020] According to the present invention, it is possible to provide a cap for a container having an opening / closing counter function in which the display does not change when the cap is opened and the display changes reliably when the cap is closed. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view of a container having a cap assembly according to one embodiment of the present invention. [Figure 2] 1 shows an overall view of the container, where (a) is a plan view and (b) is a front view. [Figure 3] FIG. 2 is an enlarged overall vertical cross-sectional view of the container. [Figure 4] 1A and 1B show an outer cap, where (a) is a front view and (b) is a bottom view. [Figure 5] 1A and 1B show an inner cap, in which FIG. 1A is a front view and FIG. 1B is a perspective view. [Figure 6] 1A is a plan view of a counter member, FIG. 1B is a front view, FIG. 1C is a bottom view, FIG. 1D is a perspective view seen from the top side, and FIG. 1E is a perspective view seen from the bottom side. [Figure 7] 10 is an enlarged longitudinal cross-sectional view of a main part of the cap assembly when the counter member rotates over the one-way locking protrusion of the inner cap. FIG. [Figure 8]An explanatory diagram of the operation of the cap-opening operation process, where (a) is a plan view when the cap-opening operation begins (i.e., the closed state), (b) is a plan view when the outer cap has been rotated approximately 10° in the cap-opening direction, and (c) is a plan view when it has been further rotated 90° in the cap-opening direction. [Figure 9] 10A and 10B are explanatory diagrams of the operation of the capping operation process, in which (a) is a plan view when the capping operation is started, and (b) is a plan view when the outer cap is rotated approximately 100° in the capping direction. [Figure 10] FIG. 10 is a plan view showing a state in which the counter member has moved slightly in the horizontal direction. [Figure 11] FIG. 10 is a plan view showing another modified example of the counter member. [Figure 12] FIG. 10 is a plan view showing yet another modified example of the counter member. [Figure 13] FIG. 10 is a plan view of a cap assembly according to another embodiment of the present invention. [Figure 14] 10A and 10B are plan views showing several modified examples of the display area of the counter member. DETAILED DESCRIPTION OF THE INVENTION

[0022] The cap assembly (a container cap having an opening / closing counter function) according to the present disclosure can be used for various containers such as eye drop containers, tablet containers, spray containers, and liquid containers.

[0023] The cap assembly includes an inner cap attached to the container opening, an outer cap attached to the inner cap so as to be rotatable relative to the inner cap within a predetermined rotation angle range, and a counter member disposed between the inner cap and the outer cap so as to be rotatable relative to the outer cap. Because the rotation of the outer cap relative to the inner cap is limited within a predetermined rotation angle range, if an attempt is made to rotate the outer cap beyond this rotation angle range, the inner cap also rotates in conjunction with the outer cap.

[0024] In one embodiment, the counter member includes n display areas (n is an integer of 2 or greater) arranged circumferentially and n one-way locking portions spaced apart circumferentially at angles corresponding to 1 / n rotations. The counter member may be disk-shaped or cylindrical. The one-way locking portions may be provided on the outer periphery of the counter member, or on the top or bottom surface. The one-way locking portions may be configured as convex portions protruding outward from the outer surface of the counter member, or as concave portions. The one-way locking portions may have a rigid structure or may be configured with elastically deformable portions. The n display areas may be provided on the top surface or outer periphery of the counter member. Alternatively, if the counter member is a transparent component, the display areas may be provided on the bottom or inner periphery of the counter member.

[0025] The outer cap may include an engaging portion that engages with the one-way locking portion when rotated in the opening direction and overcomes the one-way locking portion when rotated in the closing direction. At least one engaging portion may be provided, but multiple engaging portions may also be provided. The engaging portion may be provided on the inner peripheral surface of the cylindrical outer cap or on the underside of the top plate of the outer cap. The engaging portion may be configured as a protrusion that protrudes toward the one-way locking portion, or as a recess that receives the one-way locking portion configured as a protrusion.

[0026] The outer cap may be provided with a display window that displays one of the n display areas according to the current rotational position of the counter member relative to the outer cap. Note that it is sufficient that at least one of the display areas is displayed, and the display window may also be configured to simultaneously display a combination of multiple display areas.

[0027] The rotation angle by which the inner cap and the outer cap can rotate relative to each other can be greater than an angle corresponding to 1 / n rotation. For example, if four display areas are provided on the counter member, the rotation angle can be greater than the angle corresponding to 1 / 4 rotation, i.e., 90°. Preferably, the rotation angle can be greater than the angle required for an engaging portion engaged with one of the one-way locking portions to overcome and engage with the next one-way locking portion. Preferably, the rotation angle can be greater than the angle corresponding to 1 / n rotation by 5° or more. More preferably, the rotation angle can be greater than the angle corresponding to 1 / n rotation by 8° or more. The rotation angle is preferably smaller than the angle corresponding to 2 / n rotation. This allows the outer cap to rotate relative to the inner cap beyond 1 / n rotation, which is the rotation amount required for an engaging portion engaged with one of the one-way locking portions to engage with the next one-way locking portion, thereby ensuring the switching of the display area displayed in the display window.

[0028] According to the cap assembly of the present disclosure, when the outer cap is rotated in the opening direction, the engaging portion of the outer cap engages with the one-way locking portion, causing the counter member to rotate together with the outer cap, and as a result, one display area displayed in the display window does not change. On the other hand, when the outer cap is rotated in the closing direction, the outer cap rotates relative to the counter member by more than 1 / n rotation, causing the locking portion of the outer cap to engage with the next one-way locking portion, thereby changing the display area displayed in the display window.

[0029] A one-way ratchet mechanism may be provided between the inner cap and the counter member that allows relative rotation with respect to the inner cap so that the counter member moves with the outer cap when the outer cap is rotated in a direction to open it relative to the inner cap, and limits the relative rotation of the counter member with respect to the inner cap so that the counter member does not move with the outer cap when the outer cap is rotated in a direction to close it relative to the inner cap. According to this, the one-way ratchet mechanism causes the counter member to rotate relative to the inner cap and rotate together with the outer cap during an opening operation, thereby fixing the display area displayed in the display window, and by limiting the relative rotation of the counter member with respect to the inner cap during a closing operation, the counter member is prevented from rotating together with the outer cap even when the outer cap is rotated in a direction to close it relative to the inner cap, thereby allowing the display area displayed in the display window to be reliably changed.

[0030] The outer peripheral surface of the inner cap may be provided with m inner vertical ribs (where m is an integer smaller than n, preferably m=n-1) spaced apart in the circumferential direction. The inner peripheral surface of the outer cap may be provided with m outer vertical ribs spaced apart in the circumferential direction and circumferentially engaging with the inner vertical ribs. By configuring the outer vertical ribs to be circumferentially rotatable in the range where the inner vertical ribs are not provided, the outer cap and the inner cap can be configured to be relatively rotatable within the rotation angle range. If multiple inner vertical ribs and multiple outer vertical ribs are evenly arranged in the circumferential direction, the inner vertical ribs and the outer vertical ribs engage with each other at multiple points in the circumferential direction during opening and closing operations, allowing the inner cap to be opened and closed smoothly.

[0031] A part (for example, an upper end portion) of any one of the m outer vertical ribs may be the engaging portion. This allows the engaging portion and the outer vertical rib to be provided while simplifying the structure of the outer cap, and also simplifies the mold structure when the outer cap is injection molded, and makes it easier to remove the molded outer cap from the mold.

[0032] The counter member may be rotatable around a rotation axis extending in the vertical direction and may be supported on the rotation axis with a predetermined play. The rotation axis may be fixed to either the inner cap or the outer cap. Supporting the counter member on the rotation axis with a predetermined play allows the counter member to move slightly in the horizontal direction (perpendicular to the rotation axis). Thus, when the one-way locking portion is configured as a convex portion protruding radially outward and the engaging portion is configured as a convex portion protruding radially inward, when the outer cap is rotated in the closing direction and the engaging portion passes over the one-way locking portion, the counter member moves slightly to reduce the amount of overlap between the engaging portion and the one-way locking portion, allowing the engaging portion to pass over the one-way locking portion more smoothly. On the other hand, when the outer cap is rotated in the opening direction, the engaging portion engages with the one-way locking portion so that the counter member rotates in conjunction with the outer cap. This prevents the one-way locking portion from being pushed radially inward by the engaging portion, ensuring reliable engagement between the engaging portion and the one-way locking portion.

[0033] Preferably, the rotation angle through which the inner cap and the outer cap can rotate relative to each other is greater than the rotation angle required for the engaging portion to move over and engage with the next one-way locking portion from a state in which the engaging portion is engaged with one of the n one-way locking portions. Preferably, the rotation angle through which the inner cap and the outer cap can rotate relative to each other is smaller than an angle corresponding to 2 / n rotation.

[0034] Hereinafter, preferred embodiments of the cap assembly according to the present disclosure will be described with reference to the drawings.

[0035] Figures 1 to 10 show a cap assembly 1 according to one embodiment of the present invention, which comprises an inner cap 2 that is threadedly connected to the mouth of a container, an outer cap 3 that is attached to the inner cap 2 so as to be rotatable relative to the inner cap 2 within a range of rotation angles that is an angle equivalent to a quarter turn (i.e., 90°) plus a predetermined additional angle α (e.g., 10°), and a counter member 4 that is arranged between the inner cap 2 and the outer cap 3.

[0036] In this embodiment, as shown in FIG. 3, the container is an eye drop container with an eye drop nozzle N attached to its mouth. As shown in FIGS. 3 and 5, the inner cap 2 is a cylindrical member with a top plate, and when screwed to the container mouth, a seal provided on the underside of the top plate seals the nozzle tip opening. On the upper surface of the top plate of the inner cap 2, there are provided a rotating shaft 21 extending upward along the vertical direction, a support cylinder portion 22 surrounding the rotating shaft 21, and n one-way locking protrusions 23 provided radially outward of the support cylinder portion 22. The height of the one-way locking protrusions 23 is shorter than the height of the support cylinder portion 22. Three inner vertical ribs 24 are evenly arranged circumferentially around the upper outer periphery of the inner cap 2. Each inner vertical rib 24 extends vertically.

[0037] As shown in Figure 6, the counter member 4 is a disk-shaped member rotatably supported on a rotating shaft 21. One-way locking protrusions 41 are provided on the underside of the counter member 4, which, together with the one-way locking protrusions 23, form a one-way ratchet mechanism. The number and arrangement of the one-way locking protrusions 41 do not necessarily have to be the same as those of the one-way locking protrusions 23 of the inner cap 2, but in this embodiment, the one-way locking protrusions 41 of the counter member 4 are arranged to correspond to the one-way locking protrusions 23. These one-way locking protrusions 23, 41 each have a vertical surface that engages with each other to limit the relative rotation of the counter member 4 when it attempts to rotate clockwise (the closing direction) relative to the inner cap 2, and an inclined surface that comes into contact when the counter member 4 rotates counterclockwise (the opening direction) relative to the inner cap 2. When the inclined surfaces of the one-way locking protrusions 23, 41 come into contact with each other, the one-way locking protrusion 41 of the counter member 4 is pushed up as shown in Figure 7, causing the counter member 4 to elastically deform, thereby enabling the one-way locking protrusion 41 of the counter member 4 to climb over the one-way locking protrusion 23 of the inner cap 2.

[0038] Four display areas are provided at equal intervals along the circumferential direction on the upper surface of the counter member 4. In this embodiment, an area for displaying "morning," an area for displaying "daytime," an area for displaying "evening," and an area for displaying "night" are provided, and the timing for the user to administer eye drops can be displayed as four time periods per day.

[0039] Four one-way locking portions 42 are provided on the outer periphery of the counter member 4 so as to protrude radially outward, spaced apart at an angle corresponding to a quarter rotation, i.e., every 90°, in the circumferential direction. One circumferential end of each one-way locking portion 42 is provided with an engagement surface facing the tangential direction, and the other circumferential end is formed as a gently inclined surface.

[0040] As shown in Figures 3 and 4, the outer cap 3 is a cylindrical member having a top plate, and is rotatably attached to the inner cap 2 so as to cover the outer periphery and upper part of the inner cap 2. A recess is provided in the center of the underside of the top plate of the outer cap 3, into which the rotation shaft 21 fits. A space is provided between the underside of the top plate of the outer cap 3 and the upper end of the support tube portion 22 of the inner cap 2, and the counter member 4 is disposed in this space so as to be rotatable relative to the outer cap 3. A display window 31 is formed in the top plate of the outer cap 3 to display one of the four display areas of the counter member 4 to the user. Three outer vertical ribs 32 are evenly arranged circumferentially around the inner periphery of the upper tube portion of the outer cap 3. Each outer vertical rib 32 extends vertically. Of the three outer vertical ribs 32, the upper end of the outer vertical rib 32 that is closest to the one-way locking portion 42 of the counter member 4 in the closed state (see Figure 8(a)) functions as an engagement portion 33 that engages with the one-way locking portion 42 so as to rotate the counter member 4 in the opening direction in conjunction with the outer cap 3.

[0041] Next, the operation of the cap assembly 1 of this embodiment will be described. Figure 8 shows the operation from the closed state to the opening state. In the closed state, as shown in Figure 8(a), the clockwise end face of the outer vertical rib 32 engages with the counterclockwise end face of the inner vertical rib 24, and the engaging portion 33 is spaced approximately 10° circumferentially from the one-way locking portion 42 of the counter member 4. When the outer cap 3 is rotated approximately 10° in the opening direction, the inner cap 4 remains stationary due to the frictional resistance of the threaded connection with the container opening, and the engaging portion 33 engages with one of the one-way locking portions 42 as shown in Figure 8(b). When the outer cap 3 is then rotated 90° (1 / 4 turn), the counter member 4 together with the outer cap 3 rotates 90° relative to the inner cap 2, and as shown in Figure 8(c), the counterclockwise end face of the outer vertical rib 32 engages with the clockwise end face of the inner vertical rib 24. If the outer cap 3 is then rotated in the opening direction, the inner cap 2 and counter member 4 rotate together with the outer cap 3, allowing the cap to be opened. At this time, the counter member 4 rotates only about 10° relative to the outer cap 3, so the display area displayed in the display window 31 does not change. Therefore, after opening the cap, the user can visually check the display in the display window 31 to confirm that the timing of taking the medication is correct.

[0042] Figure 9(a) shows the state at the start of capping. As the outer cap 3 is rotated in the capping direction, the counter member 4 is restricted from rotating in the capping direction relative to the inner cap 2 by the ratchet mechanism, and the outer vertical rib 32 passes over the inclined surface of the one-way locking portion 42, so that only the outer cap 3 rotates approximately 100° in the capping direction relative to the inner cap 2 and counter member 4 as shown in Figure 9(b). This allows the engagement portion 33 to reliably pass over the next one-way locking portion 42 and engage with it.

[0043] In order to allow the outer vertical ribs 32 to easily overcome the one-way locking portions 42 during the capping operation, the counter member 4 can be pivotally supported on the rotation shaft 21 with a predetermined amount of play so that it can move slightly horizontally. As a result, as shown in Figure 10, when one of the outer vertical ribs 32 overcomes one of the one-way locking portions 42, the counter member 4 can be moved slightly horizontally to reduce the amount of overlap, thereby making the capping operation smoother.

[0044] FIG. 11 shows another embodiment of the counter member structure, in which slits 45 extending from the outer periphery toward the center are provided at the boundary of each display area, making it easier for the counter member shown in FIG. 7 to deform.

[0045] Figure 12 shows another embodiment of the counter member structure, in which a notch 46 is provided in the circumferential direction from the engagement surface of the one-way locking portion 42. This allows the one-way locking portion 42 itself to elastically deform slightly radially inward when the outer vertical rib 32 rides over the inclined surface of the one-way locking portion 42, making the capping operation smoother. Note that both the slit 45 shown in Figure 11 and the notch 46 shown in Figure 12 can be provided in the counter member.

[0046] 13 shows another embodiment of the cap assembly according to the present disclosure, illustrating a structural example in which n=6, i.e., six display areas are provided. In this case, it is preferable to arrange five inner vertical ribs 24 and five outer vertical ribs 32 evenly in the circumferential direction.

[0047] The present invention is not limited to the above embodiment and can be modified as needed. For example, the number and content of the display areas on the counter member may be as appropriate, as shown in Figures 14(a) to 14(d).

Claims

1. The container includes an inner cap attached to a container opening, an outer cap attached to the inner cap so as to be rotatable relative to the inner cap within a predetermined rotation angle range, and a counter member disposed between the inner cap and the outer cap so as to be rotatable relative to the outer cap, The counter members are n pieces (n is an integer of 2 or more) arranged along the circumferential direction. ) and n one-way locking portions provided at intervals of an angle corresponding to 1 / n rotation in a circumferential direction, the outer cap includes an engaging portion that engages with the one-way locking portion when rotated in an opening direction and that overcomes the one-way locking portion when rotated in a closing direction, and a display window that displays one of the n display areas according to a current rotation position of the counter member relative to the outer cap, The rotation angle at which the inner cap and the outer cap can rotate relative to each other is greater than the angle corresponding to the 1 / n rotation. A container cap with an opening and closing counter function.

2. A cap for a container with an opening / closing counter function as described in claim 1, wherein a one-way ratchet mechanism is provided between the inner cap and the counter member, which allows relative rotation of the counter member with respect to the inner cap so that the counter member moves in conjunction with the outer cap when the inner cap is rotated in a direction to open the outer cap relative to the inner cap, and which limits relative rotation of the counter member with respect to the inner cap so that the counter member does not move in conjunction with the outer cap when the outer cap is rotated in a direction to close the inner cap relative to the inner cap.

3. A container cap with an opening and closing counter function as described in claim 1, wherein the outer peripheral surface of the inner cap is provided with m (where m is an integer smaller than n) inner vertical ribs spaced apart in the circumferential direction, and the inner peripheral surface of the outer cap is provided with m outer vertical ribs spaced apart in the circumferential direction and circumferentially engaging with the inner vertical ribs, and the outer vertical ribs are configured to be circumferentially rotatable in the range where the inner vertical ribs are not provided, thereby allowing the outer cap and the inner cap to rotate relatively within the rotation angle range.

4. 4. The container cap having an opening / closing counter function according to claim 3, wherein a part of any one of said m outer vertical ribs is said engaging portion.

5. A container cap having an opening / closing counter function as described in claim 3 or 4, wherein the counter member is rotatable around a rotation axis along the vertical direction and is supported on the rotation axis with a predetermined play.

6. A cap for a container having an opening / closing counter function as described in claim 1, wherein the rotation angle at which the inner cap and the outer cap can rotate relative to each other is greater than the rotation angle required for the engaging portion to overcome the next one-way locking portion and engage with it from a state in which the engaging portion is engaged with any one of the n one-way locking portions.

7. 2. The container cap having an opening / closing counter function according to claim 1, wherein the rotation angle at which the inner cap and the outer cap can rotate relative to each other is smaller than an angle corresponding to 2 / n rotation.

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