Synthetic Resin Cap

Abstract

To provide a synthetic resin cap which has a structure in which convenience during drinking is further improved, while suppressing drop or loss of a cap when opening the cap.SOLUTION: A synthetic resin cap includes: a tamper-evident band fitted in an outer peripheral surface of a container mouth part; and a cap body having a skirt wall and a top surface plate, connected to the tamper-evident band via a weakened part and a strap part, and having a fixing rib, on the skirt wall, further protruding to the outside in the radial direction than the skirt wall. The fixing rib is formed of a first inclined part widening downward, and a protrusion part provided below the first inclined part. At the time of cap opening, by a side surface of the container mouth part coming into contact with the protrusion part, and by a top surface of a lateral extension part provided below the container mouth part and extended in the radial direction coming into contact with the top surface plate, a posture at the time of opening of the cap body is maintained.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a synthetic resin cap, and more particularly to a synthetic resin cap that is fitted into, for example, a container having a mouth and maintains connection with the container mouth even when the cap is opened. [Background technology]

[0002] Various containers are known as containers for storing beverages, such as PET bottles, beer bottles, etc. Various shapes of such containers are known depending on the application, and for example, bottles that are used to store dairy beverages such as milk and have a cap attached to the mouth of the container (hereinafter also referred to as the "container mouth") are also known.

[0003] Generally, when removing a cap from the mouth of such a container to open it, the cap is often separated from the mouth of the container. In response to this, as exemplified by Patent Documents 1 and 2, for example, caps are known in which a ring member or the like that remains at the bottom of the cap when opened is connected to the cap body, and these documents disclose a structure in which the cap does not come off the container and the connection between the container mouth and the cap is maintained even when the container is opened. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 6-81955 [Patent Document 2] Jpn. Jpn. Published No. 56-20369 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the cap structures exemplified in Patent Documents 1 and 2, the cap body rotates around the ring member remaining at the bottom of the container mouth, so that the cap does not come off the container mouth when it is opened, and thus the cap can be prevented from falling off or being lost. However, conventional structures including Patent Documents 1 and 2 still have the following problems.

[0006] That is, when the content stored in the container is to be consumed, in addition to pouring it into another container such as a cup, the drinker often drinks directly through the mouth of the container. However, in conventional structures including those in Patent Documents 1 and 2, it is difficult for the cap body to rotate sufficiently around the mouth of the container when opening the container, and there is a possibility that the cap may come into contact with the drinker's cheek or nose when drinking, causing discomfort.

[0007] As such, there is still room for improvement in the conventional technology including the above-mentioned patent documents, and one example of an objective of the present invention is to provide a synthetic resin cap that prevents the cap from falling off or being lost when opening, while also preventing the cap from coming into contact with the drinker's cheek, nose, etc. when drinking. [Means for solving the problem]

[0008] In order to solve the above problems, a synthetic resin cap in one embodiment of the present invention includes (1) a tamper-evident band that is fitted onto the outer peripheral surface of a container mouth, and a cap body having a skirt wall and a top plate, connected to the tamper-evident band via a weakened portion and a strap portion, and provided with a fixed rib on the skirt wall that protrudes radially outward beyond the skirt wall, wherein the fixed rib is formed from a first inclined portion that widens downward and a protrusion provided below the first inclined portion, and when the cap is opened, the side of the container mouth comes into contact with the protrusion, and the top plate comes into contact with an upper surface of a lateral extension provided below the container mouth and extending radially, thereby maintaining the posture of the cap body when opened.

[0009] In the synthetic resin cap described in (1) above, (2) it is preferable that the cap body maintains the posture it had when opened when rotated about the strap portion at its base end by more than 180° from its unopened state.

[0010] In addition, in the synthetic resin cap described in (2) above, (3) it is preferable that the protrusion has an installation height from the lower end of the fixing rib set so that the cap body can be rotated more than 180°.

[0011] Furthermore, in the synthetic resin cap described in any of (1) to (3) above, (4) when the cap is opened, it is preferable that the first inclined portion slides along the side of the lateral extension portion, thereby guiding the upper edge portion of the top plate to slide under the upper surface of the lateral extension portion.

[0012] Furthermore, in the synthetic resin cap described in any of (1) to (4) above, (5) the protrusion comprises an intermediate step portion extending radially outward from the lower end of the first inclined portion, a shoulder portion curved downward at the outer end of the intermediate step portion, and an outer surface portion protruding radially outward from the shoulder portion, and it is preferable that a second inclined portion tapering downward is provided at the lower end of the outer surface portion to suppress interference with the tamper-evident band when the cap is opened.

[0013] In the synthetic resin cap described in any of (1) to (5) above, (6) it is preferable that the strap portion has at least two connecting straps, and the fixing rib is arranged so as to be interposed between the two connecting straps.

[0014] In the synthetic resin cap described in any one of (1) to (6) above, (7) the cap body preferably further includes a flange portion provided on the side opposite to the fixing rib. Effect of the Invention

[0015] According to the synthetic resin cap of the present invention, the cap body is connected to the tamper evident band via the strap, which prevents the cap from falling off or being lost when the cap is opened. In addition, when the cap is opened, the side of the container mouth comes into contact with the protruding portion below the first inclined portion, and the upper surface of the lateral extension below the container mouth comes into contact with the top plate, so that the posture of the cap body when opened is maintained, which further improves convenience when drinking. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view of the appearance of a synthetic resin cap in an embodiment when viewed from a certain direction. [Diagram 2] FIG. 11 is an external perspective view of the synthetic resin cap in the embodiment when viewed from another direction. [Diagram 3] FIG. 2 is a top view of the synthetic resin cap according to the embodiment; [Figure 4] 4 is a cross-sectional view taken along the line AA in FIG. 3. FIG. [Diagram 5] FIG. 4 is a bottom view of the synthetic resin cap according to the embodiment; [Figure 6] FIG. 2 is a front view of the synthetic resin cap according to the embodiment, seen from the flange side. [Figure 7] 10A is a rear view of the synthetic resin cap according to the embodiment, seen from the fixing rib side, and FIG. 10B is a rear view showing another example of the connection form of the strap portion to the skirt wall. [Figure 8] 4 is a cross-sectional view showing the structure of a fixing rib of the synthetic resin cap in the embodiment. FIG. [Figure 9] 10 is a state transition diagram illustrating a method for opening a synthetic resin cap in an embodiment. FIG. [Figure 10] FIG. 11 is a state transition diagram illustrating a method for opening a synthetic resin cap in a comparative example. [Figure 11] 11A and 11B are schematic diagrams showing other examples of lateral extension portions in the container of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, preferred embodiments of the present invention will be described. In this embodiment, for convenience of explanation, the X, Y, and Z directions are appropriately set in the explanation using the drawings, but this is for convenience of explanation and does not excessively limit the present invention. In addition, for the configurations other than those described in detail below, the structures of known containers and caps can be appropriately used.

[0018] <Synthetic Resin Cap 100> The structure of the synthetic resin cap 100 according to this embodiment will be described in detail with reference to FIGS.

[0019] As shown in Figures 1 and 2, the synthetic resin cap 100 of this embodiment has a function of fitting into the spout of a container mouth 201 of a container 200 described later, and is configured to include at least a tamper-evident band 10 and a cap body 20 as a so-called upper lid.

[0020] Here, an example of the container 200 suitable for this embodiment is a bottle such as a known milk bottle, in which a cap is attached to the container mouth by screwing it on. The container 200 is not limited to the above bottle, and may be a general bottle for storing soft drinks, tea, etc., in which a cap is attached to the container mouth by screwing it on. In addition, a polyester resin such as polyethylene terephthalate (PET) resin is suitable as the material for the container 200, but various other known materials such as the above-mentioned glass bottle can also be used.

[0021] The contents stored in the container 200 are not particularly limited, and may be any of various known liquids, such as milk or other dairy drinks, or tea or other soft drinks. Instead of the various liquids described above, the contents stored in the container 200 may be any known solid material, such as medicines or foods, such as tablets, or any known semi-solid material in a gel form.

[0022] 1 and 2, the container 200 includes a container mouth 201 having a spout for pouring out the contents, a ring-shaped lateral extension 202 provided below the container mouth 201, and a main body 203 (only the upper part of the main body 203 is shown in the figure, and the lower part is omitted) located below the lateral extension 202. The ring-shaped lateral extension 202 shown in this embodiment is provided below the container mouth 201 and functions as a neck support extending radially outward from the container mouth 201, and is a portion that is held by a transport mechanism when the container 200 is transported, or is held to prevent buckling of the container main body when a cap is attached.

[0023] In this embodiment, the lateral extension 202 is in the form of a ring along the entire circumference of the container mouth 201, but is not limited to this form and may be in the form of a protrusion protruding in the radial direction. Furthermore, the lateral extension portion 202 of this embodiment is not limited to the ring-shaped form described above, and may be, for example, in a form in which the lateral extension portion 202 is integrated as part of the main body 203 of the container 200 (forming the upper part), as illustrated in Figure 11. 1 and the like as an example of the above-mentioned lateral extension 202 (hereinafter, the description will be given as the neck support 202). In addition, for the structure of the container 200 other than the above-mentioned, a known container structure including the above-mentioned patent documents may be applied.

[0024] The synthetic resin cap 100 of this embodiment is preferably a stopper-type cap in which an inner ring 23, which will be described later, is fitted inside the container mouth 201. The material of such a synthetic resin cap 100 is preferably relatively soft, and for example, olefin resin including polypropylene resin or polyethylene resin such as loden is suitable, but other known synthetic resins may also be used.

[0025] As can be seen from Figures 1, 2, and 5, the tamper-evident band 10 has a function of being fitted into the outer peripheral surface of a container mouth 201. As shown in Figure 5, fitting projections 13 are provided at predetermined intervals on the inner peripheral surface of the tamper-evident band 10, and the fitting projections 13 fit into the container mouth 201 to maintain the band fitted into the outer peripheral surface of the container mouth 201. As shown in Figure 5, the fitting projections 13 may not be formed on the inner peripheral surface of the tamper-evident band 10 in the areas where the fixing rib 30 and the strap portion 12 (both of which will be described later) are provided.

[0026] 1 and 2, the cap body 20 is configured as an upper lid having a skirt wall 21 and a top plate 22. Of these, the skirt wall 21 is provided so as to hang down from the periphery of the top plate 22 so as to cover the outer peripheral surface of the container mouth portion 201 when the container 200 is closed.

[0027] As described above, an inner ring 23 capable of being fitted into the pouring outlet of the container mouth 201 is formed on the inside of the top plate 22. Note that the structure of the inner ring 23 may be of various known shapes as long as it can seal the pouring outlet.

[0028] A flange 40 is provided near the upper end of the skirt wall 21 on the side opposite to the fixing rib 30 described later. As can be seen from Figs. 4 and 6, the flange 40 in this embodiment is preferably configured to have a width W2 that is wider than the width W1 of the fixing rib 30 in the circumferential direction. The width W2 of the flange 40 does not necessarily have to be wider than the width W1, and may be narrower than or equal to the width W1. This allows the user to efficiently pick up the cap body 20 and perform an opening operation, for example, regardless of where in the circumferential direction the flange 40 is held.

[0029] As shown in the figure, it is preferable that the flange 40 of this embodiment protrudes in the radial direction to an extent that the drinker can pick up the flange 40. This prevents the drinker's fingers from unintentionally coming into contact with the container mouth 201 when opening the bottle, which is preferable from a hygienic standpoint.

[0030] 1, 2, 7(a) and 8, the cap body 20 of this embodiment is connected to the tamper-evident band 10 via the weakened portion 11 and the strap portion 12 at the lower edge of the skirt wall 21 described above. In Fig. 7(a), the strap portion 12 in this embodiment is connected to the lower edge of the skirt wall 21, but the manner in which the strap portion 12 is connected to the skirt wall 21 is not limited to this. That is, as shown in Fig. 7(b), a part of the lower edge of the skirt wall 21 may be raised upward, and the upper end of the strap portion 12 may be connected to this raised skirt wall 21.

[0031] As is clear from these figures, the weakened portion 11 temporarily connects the tamper-evident band 10 and the cap body 20, and is configured to have a strength such that it can be easily broken, for example, when a user opens the bottle by pinching up the flange 40. In other words, when the bottle is unopened, the tamper-evident band 10 and the cap body 20 are connected via the weakened portion 11, and once the bottle is opened, the weakened portion 11 breaks, providing evidence of opening.

[0032] In this embodiment, the weakened portions 11 are provided intermittently around the axis of the cap body 20, but the present invention is not limited to this. For example, instead of the above, the weakened portions 11 may be thin-walled and connected to the tamper-evident band 10 and the cap body 20 continuously along the circumferential direction.

[0033] As shown in Figures 2 and 8, the strap portion 12 is disposed on the side opposite the flange portion 40 where the fixing rib 30 described later is provided, and is configured to have the function of permanently connecting the above-mentioned tamper-evident band 10 and the cap body 20.

[0034] More specifically, as can be seen from these figures, the strap portion 12 of this embodiment is configured to include a pair of a first connecting strap 12a and a second connecting strap 12b that sandwich a fixing rib 30 therebetween.

[0035] For example, when a user picks up the flange 40 to open the container 200, the cap body 20 maintains its connection to the tamper-evident band 10 via the strap portion 12. This prevents the cap body 20 from coming off the container 200 (more precisely, the tamper-evident band 10 fitted into the container mouth 201) even during the above-mentioned opening, preventing the cap body 20 from falling off or being lost after opening.

[0036] In this embodiment, the strap portion 12 has at least two connecting straps, and the fixing rib 30 is disposed between these two connecting straps. However, this embodiment is not limited to the above embodiment, and may have, for example, one or three or more connecting straps, or may have a different number of connecting straps disposed on each side of the fixing rib 30. In addition, in this embodiment, as described above, an example has been given of the flange portion 40 being pinched up by the user when opening the bottle, but other than this method, for example, the flange portion 40 may be gripped with a finger on the underside thereof and pushed up from below.

[0037] <Fixed rib 30> Next, with particular reference to Figures 2, 4 and 8, the structure and function of the fixing rib 30 in this embodiment will be described in detail. First, as can be understood from these figures, the cap body 20 of this embodiment is further configured with a fixed rib 30 that hangs down from the above-mentioned skirt wall 21 and protrudes radially outward from this skirt wall 21 (for example, in the -X direction in Figure 2).

[0038] 2, the fixing rib 30 is provided on the opposite side of the cap body 20 to the flange portion 40. As can be seen from FIG. 4, in the cap body 20 of this embodiment, a part of the skirt wall 21 is replaced with the fixing rib 30.

[0039] 4, the height (length in the Z direction) of the tamper-evident band 10 located below the flange portion 40 is set to be higher than the height of the tamper-evident band 10 located below the fixing rib 30. In other words, the tamper-evident band 10 of this embodiment is set so that its height in the axial direction is not uniform but varies in the circumferential direction. As described above, the tamper-evident band 10 of this embodiment has the fitting projections 13 provided on the inner peripheral surface side along the circumferential direction except for positions corresponding to the fixing rib 30 and the strap portion 12.

[0040] As shown in Figures 2 and 8, the fixing rib 30 of this embodiment is configured to include, from the upper side of the top panel 22 side to the lower side of the tamper-evident band 10 side, a first inclined portion 31, an intermediate step portion 32, a shoulder portion 33, an outer surface portion 34, a lower tapered portion 35 and a bottom surface portion 36.

[0041] The first inclined portion 31 is formed on the top of the fixed rib and has a shape that widens downward. As shown in Fig. 8, the first inclined portion 31 is a linear inclined surface inclined at about 20° with respect to the vertical direction, but is not limited to this shape and may be a curved surface or an inclined surface with an inclination of about 15 to 25°.

[0042] 8 and other figures, the intermediate step portion 32 is a surface extending radially outward from the lower end of the first inclined portion 31. More specifically, the intermediate step portion 32 in this embodiment is disposed between the first inclined portion 31 and a shoulder portion 33 described later, and is configured to include a surface that is approximately parallel to the top panel 22. 8 and other figures, the shoulder portion 33 is a portion curved downward at the outer end of the intermediate step portion 32. More specifically, the shoulder portion 33 in this embodiment is a curved corner portion that is provided below the first inclined portion 31 and continues to the outer surface portion 34 at the outer edge of the intermediate step portion 32.

[0043] In this manner, the fixing rib 30 of this embodiment has the above-mentioned first inclined portion 31, intermediate step portion 32, and shoulder portion 33, but if these were not present, it would have a structure that hangs down from the top panel 22 (shown as boundary portion BP in FIG. 8) like the other skirt walls 21. The installation height of the intermediate step portion 32 and shoulder portion 33 (height from the lower end of the fixing rib 30) can be determined by experiment, simulation, or the like so that the pivot angle of the cap body 20 when opened is maintained at more than 180°.

[0044] The outer side surface portion 34 is a side surface that continues from the shoulder portion 33 and protrudes radially outward beyond the skirt wall 21. A lower taper portion 35 that narrows (reduced in diameter) downward is formed on the lower side of the outer side surface portion 34. 2 to 5 and 8, the fixing rib 30 has the above-mentioned intermediate step portion 32, shoulder portion 33, outer surface portion 34 and lower tapered portion 35, and thus has a portion that protrudes radially outward below the first inclined portion 31. Therefore, in this embodiment, the region of the fixing rib 30 that is composed of the intermediate step portion 32, shoulder portion 33, outer surface portion 34 and lower tapered portion 35 is defined as the "protrusion."

[0045] This lower tapered portion 35 functions as a second inclined portion located below the above-mentioned first inclined portion 31, and is provided for the purpose of suppressing interference with the tamper-evident band 10 when opening the bottle, as will be described later.

[0046] In addition, a bottom surface portion 36 which constitutes the bottom surface of the fixed rib 30 and is continuous with the above-mentioned lower tapered portion 35 is disposed so as to face the upper surface of the above-mentioned tamper-evident band 10 with a predetermined gap therebetween.

[0047] According to the synthetic resin cap 100 having the fixing rib 30 composed of the above-mentioned parts, when the cap is opened, (A) the side surface of the container mouth 201 comes into contact with the protrusion provided below the first inclined portion 31, and (B) the upper surface 202a of the neck support 202 provided below the container mouth 201 comes into contact with the top plate 22. This allows the position of the cap body 20 to be maintained when the cap is opened. As described later, in this embodiment, a form in which the shoulder portion 33 of the protrusion contacts the side surface of the container mouth 201 (see FIG. 9(c), etc.) is illustrated, but the present invention is not limited to this form. For example, the outer surface portion 34 constituting the protrusion may contact the side surface of the container mouth 201. In the following explanation, the case in which the shoulder portion 33 of the protrusion contacts the side surface of the container mouth 201 will be used as an example.

[0048] <State transition when opening> Next, a method for opening the synthetic resin cap 100 in this embodiment will be described with reference to state transitions, also with reference to FIGS.

[0049] 9, when a drinker drinks the contents (such as milk) from the container 200, the drinker first opens the synthetic resin cap 100 that seals the spout. Although not shown, the container 200 may further be provided with a known package such as shrink wrap that covers the synthetic resin cap 100.

[0050] When opening the bottle, the drinker first pinches the flange 40 with his or her fingers, etc. This pinching force breaks the weakened portion 11 that temporarily connects the tamper-evident band 10 to the cap body 20. When the weakened portion 11 breaks, the flange 40 rotates (inverts) upward with the strap portion 12 as the base point, and the inner ring 23 detaches from the spout of the container 200.

[0051] 9(b), when the cap body 20 continues the above-mentioned pivoting motion, the second inclined portion (lower tapered portion 35) of the fixing rib 30 slides over the tamper-evident band 10, and then the first inclined portion 31 of the fixing rib 30 slides over the side surface 202b of the neck support 202 of the container 200. In this way, since the fixing rib 30 is formed with the first inclined portion that widens downward as described above, the fixing rib 30 can slide smoothly against the neck support 202 without getting caught.

[0052] Next, as shown in Figure 9 (c), when the cap body 20 continues to rotate as described above, the outer surface of the container mouth 201 comes into contact with the shoulder 33 (protrusion) provided below the first inclined portion 31 as described above, and the upper surface 202a of the neck support 202 provided below the container mouth 201 comes into contact with the top plate 22, thereby maintaining the posture of the cap body 20 at the time of opening (two-point contact state).

[0053] At this time, as shown in Fig. 9(c), it is preferable that the cap body 20 maintains the posture at the time of opening in a state where it has been rotated about the base end of the strap portion 12 by more than 180° from the unopened state. Note that in the figure, the angle from the unopened state is maintained at about 225°, but this angle is one example and can be appropriately adjusted by the position and shape of the neck support 202 or the set height of the shoulder portion 33 described above.

[0054] In this manner, the shoulder portion 33 (protrusion portion) of the fixing rib 30 in this embodiment is set at an installation height from the lower end (bottom surface portion 36) of the fixing rib 30 so that the above-mentioned rotation angle exceeds 180° and the cap body 20 can rotate.

[0055] 9(a) to 9(b), the fixing rib 30 of this embodiment has the second inclined portion (lower tapered portion 35) described above, so that even if the cap body 20 rotates during the above-mentioned opening, the fixing rib 30 itself is prevented from interfering with the tamper-evident band 10. This prevents the cap body 20 from stopping its rotation in the early stage of the opening operation.

[0056] Furthermore, as can be understood from the state transition from Figure 9(b) to Figure 9(c), the synthetic resin cap 100 of this embodiment is characterized in that, during the above-mentioned opening, the first inclined portion 31 of the fixing rib 30 slides over the side 202b of the neck support 202, thereby guiding the upper edge portion of the top panel 22 to slide under the upper surface 202a of the neck support 202.

[0057] By virtue of these characteristics, in this embodiment, the upper edge of the top panel 22 is prevented from slipping under the underside 202c of the neck support 202, thereby preventing unintended breakage of the tamper-evident band 10 or the strap portion 12.

[0058] <Synthetic resin cap 101 as a comparative example> 10 shows state transitions in an opening method using a synthetic resin cap 101 that does not have the fixing rib 30 as a comparative example of this embodiment. In this comparative example, members having the same functions and configurations as those in the above embodiment are given the same numbers and their explanations are omitted.

[0059] As is clear from the figure, the synthetic resin cap 101 in the comparative example does not have the fixing rib 30 of this embodiment, so that when opening the cap, for example, as shown in Figure 10(b), the neck support 202 has difficulty sliding against the skirt wall 21, and a relatively strong force is required to open the cap.

[0060] Furthermore, in the synthetic resin cap 101 of the comparative example, since the neck support 202 does not easily slide on the skirt wall 21, the upper surface 202a of the neck support 202 and the top plate 22 do not come into contact with each other, and the upper edge of the top plate 22 slips into the lower surface 202c of the neck support 202 as shown in FIG. 10(c). In this case, for example, the tamper-evident band 10 or the strap part 12 may be subjected to excessive force and may break. In addition, even if the strap part 12 is prevented from breaking, the strap part 12 may be excessively stretched, and the turning radius of the top lid (cap body) when opening becomes large, making it difficult to maintain a stable fixation of the top lid after opening. If it becomes difficult to maintain a stable fixation of the top lid, the fixation of the top lid may be unintentionally released during drinking and return in the closing direction, which may cause interference with the user's nose while drinking, for example.

[0061] In contrast, according to the synthetic resin cap 100 of this embodiment, when the cap is opened, the first inclined portion 31 of the fixing rib 30 slides over the side surface 202b of the neck support 202, thereby guiding the top cover (the upper edge portion of the top panel 22) to slide under the upper surface 202a of the neck support 202. Thereafter, the side surface of the container mouth 201 comes into contact with the shoulder 33 (protrusion) of the fixing rib 30, and the upper surface 202a of the neck support 202 comes into contact with the top panel 22 (two-point contact state).

[0062] By virtue of these characteristics, in this embodiment, the upper edge of the top panel 22 is prevented from slipping under the underside 202c of the neck support 202, allowing rotation of more than 180° while preventing unintended breakage of the tamper-evident band 10 or the strap portion 12.

[0063] As described above, the synthetic resin cap 100 of this embodiment may include the second inclined portion (the lower tapered portion 35) in the fixing rib 30. For example, in order to more effectively achieve the above-mentioned top lid inversion of 180° or more, it is desirable for the fixing rib 30 to protrude radially outward to a certain extent so that the tamper-evident band 10 overcomes the fixing rib 30 when the cap is opened, and this can be achieved by providing the fixing rib 30 with a second inclined portion.

[0064] Thus, it is clear that the synthetic resin cap 100 of this embodiment and the synthetic resin cap 101 of the comparative example are significantly different not only in terms of openability (ease of opening) but also in terms of stability (resistance to unintentional breakage). Furthermore, by having the above-mentioned characteristics, the synthetic resin cap 100 of this embodiment can achieve large top lid inversion (for example, a rotation angle of more than 180°) with a relatively small amount of resin material, even if the axial dimension of the synthetic resin cap 100 is reduced, thereby achieving further cost reduction while achieving the above-mentioned effects.

[0065] The above-described embodiment is merely an example, and various modifications are possible without departing from the spirit of the present application. For example, the inner ring 23 is provided on the inside (bottom surface) of the top plate 22 of the synthetic resin cap 100, but instead of or in addition to this, a known packing or the like may be provided on the bottom surface of the top plate 22.

[0066] The position of the flange 40 in the axial direction (height direction, Z direction) may be changed as appropriate according to the design value of the opening force of the drinker. That is, the flange 40 may be provided at a higher position than the intermediate step 32 of the fixing rib 30 in the axial direction, or at a lower position than the intermediate step 32. [Industrial Applicability]

[0067] The present invention is suitable for realizing a cap that further improves convenience when drinking while preventing the cap from falling off or being lost when opening the bottle. [Explanation of symbols]

[0068] 100, 101 Synthetic resin cap 10 Tamper Evident Band 20 Cap body 20 21 Skirt Wall 22 Top plate 23 Inner Ring 30 Fixed rib 31 1st slope part 32 Intermediate stage 33 Shoulder 34 External surface 35 Lower tapered section 36 Bottom part 40 Flange 200 containers 201 Mouth 202 Neck support (an example of a lateral extension)

Claims

1. A tamper-evident band fitted to an outer peripheral surface of a container mouth; a cap body having a skirt wall and a top plate, connected to the tamper evident band via a weakened portion and a strap portion, and including a fixing rib on the skirt wall that protrudes radially outward beyond the skirt wall; The fixing rib is formed of a first inclined portion that widens downward and a protruding portion provided below the first inclined portion, When the cap is opened, the side surface of the container mouth comes into contact with the protrusion, and the top surface of a lateral extension portion that is provided below the container mouth and extends in the radial direction comes into contact with the top plate, thereby maintaining the posture of the cap body when opened. A synthetic resin cap.

2. 2. The synthetic resin cap according to claim 1, wherein the cap body maintains the posture at the time of opening when rotated about the strap portion at a base end by more than 180 degrees from an unopened state.

3. 3. The synthetic resin cap according to claim 2, wherein the protruding portion has an installation height from the lower end of the fixing rib set so that the cap body can be rotated beyond the 180°.

4. A synthetic resin cap as described in any one of claims 1 to 3, wherein when the cap is opened, the first inclined portion slides along the side of the lateral extension portion, thereby guiding the upper edge portion of the top panel to slide under the upper surface of the lateral extension portion.

5. the protruding portion includes an intermediate step portion extending radially outward from a lower end of the first inclined portion, a shoulder portion curved downward at an outer end portion of the intermediate step portion, and an outer surface portion protruding radially outward from the shoulder portion, A synthetic resin cap as described in any one of claims 1 to 4, wherein a second inclined portion that tapers downward is provided at the lower end of the outer surface portion to suppress interference with the tamper-evident band when the cap is opened.

6. The strap portion includes at least two connecting straps; The synthetic resin cap according to any one of claims 1 to 5, wherein the fixing rib is disposed so as to be interposed between the two connecting straps.

7. The synthetic resin cap according to any one of claims 1 to 6, wherein the cap body further comprises a flange portion provided on an opposite side to the fixing rib.

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