synthetic resin cover

Abstract

The present invention provides a synthetic resin lid having a structure that prevents the lid from falling or being lost when opened and further improves the convenience of drinking. As a specific example of the present invention, the synthetic resin lid includes: an anti-tampering band embedded in the outer peripheral surface of the container mouth; and a lid body having a skirt wall and a top plate, and connected to the anti-tampering band via a weakened portion and a band portion. The skirt wall is provided with a fixing rib that protrudes radially outward from the skirt wall. The fixing rib is formed by a first inclined portion that expands fan-shaped downward and a protrusion provided below the first inclined portion. When the lid is opened, the side surface of the container mouth contacts the protrusion, and the upper surface of the lateral extension portion provided below the container mouth and extending radially contacts the top plate, thereby maintaining the lid body's posture when opened.

Description

Technical Field

[0001] The present invention relates to a synthetic resin cap, and more particularly to a synthetic resin cap having a structure that can be inserted into a container having a mouth and can maintain connection with the container mouth even when the cap is opened. Background Art

[0002] As containers for storing beverages, various containers are known, such as plastic bottles (PET bottles) and beer bottles. These containers are known in various forms depending on their intended use. For example, as containers for storing dairy beverages such as milk, bottles with a cap pressed onto the mouth of the container (hereinafter also referred to as "container mouth") are also known.

[0003] Generally, when the lid is removed from the mouth of these containers to open them, the lid often separates from the container mouth. Regarding this, as exemplified in Patent Documents 1 and 2, lids are known in which a ring member or the like remains at the bottom of the lid when opened and is connected to the lid body. These documents disclose structures that prevent the lid from separating from the container even when the lid is opened, maintaining the connection between the container mouth and the lid.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Utility Model Application Laid-Open No. 6-81955

[0007] Patent Document 2: Japanese Utility Model Publication No. 56-20369 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] According to the lid structures exemplified in Patent Documents 1 and 2, the lid body is pivoted using the ring member remaining below the container mouth as a base point. This prevents the lid from falling off the container mouth when opening, thus preventing the lid from falling off or being lost. However, conventional structures including those disclosed in Patent Documents 1 and 2 still have the following problems.

[0010] That is, when drinking the contents stored in a container, the drinker often drinks directly from the container mouth, in addition to pouring the contents into other containers such as a cup.

[0011] However, in the existing structures including Patent Document 1 and Patent Document 2, since the lid body is difficult to fully rotate at the container mouth when opening the lid, it cannot be denied that there is a possibility that the lid will interfere with the drinker's cheek, nose, etc. when drinking, causing discomfort.

[0012] Furthermore, if it is clear to what extent the cap body must be rotated from the container mouth to complete opening, it can be said that it contributes to improving the convenience of the drinker.

[0013] Thus, there is still room for improvement in the prior art including the above-mentioned patent documents. As an example of the purpose of the present invention, there is provided a synthetic resin cap that can prevent the cap from falling off or being lost when opening the cap, and can easily grasp the completion of the opening of the cap as needed, and can prevent the cap from coming into contact with the drinker's cheek, nose, etc. when drinking.

[0014] Solutions to Problems

[0015] In order to solve the above-mentioned problems, a synthetic resin cap according to one embodiment of the present invention is characterized in that it includes: (1) a tamper-evident band embedded in the outer peripheral surface of the container mouth, and a cap body having a skirt wall and a top plate, and connected to the above-mentioned tamper-evident band via a weakened portion and a band portion, and the above-mentioned skirt wall is provided with a fixing rib protruding radially outward than the above-mentioned skirt wall, and the above-mentioned fixing rib is formed by a first inclined portion fan-shapedly extending downward and a protrusion arranged below the above-mentioned first inclined portion. When the cap is opened, the side surface of the above-mentioned container mouth contacts the above-mentioned protrusion, and the upper surface of the side extension portion arranged below the above-mentioned container mouth and extending in the radial direction contacts the above-mentioned top plate, thereby maintaining the posture of the above-mentioned cap body when the cap is opened.

[0016] Alternatively, in order to solve the above-mentioned problems, a synthetic resin cap of one embodiment of the present invention is characterized in that it includes: (2) an anti-tampering band embedded in the outer peripheral surface of the container mouth; and a cap body having a skirt wall and a top plate, and connected to the above-mentioned anti-tampering band via a weakened portion and a band portion, the above-mentioned skirt wall is provided with a fixing rib protruding radially outward than the above-mentioned skirt wall, the above-mentioned fixing rib has a protrusion, the protrusion at least includes an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the above-mentioned intermediate step portion, and a curved portion that is continuous from the above-mentioned shoulder and gradually decreases in diameter downward, when opening the cap, after the jaw portion provided on the above-mentioned container mouth slides along the above-mentioned curved portion, the side surface of the above-mentioned container mouth contacts the above-mentioned protrusion, and the upper surface of the side extension portion provided below the above-mentioned container mouth and extending in the radial direction contacts the above-mentioned top plate, thereby maintaining the posture of the above-mentioned cap body when opening the cap, the above-mentioned protrusion also has a first inclined portion, which is arranged above the above-mentioned intermediate step portion and expands in a fan shape from the above-mentioned top plate toward the bottom.

[0017] In the synthetic resin cap described in (2) above, it is preferred that (3) the above-mentioned curved portion is composed of a curved surface that bulges upward when the above-mentioned cap body seals the above-mentioned container mouth, so that the opening force required for flipping the above-mentioned cap body through the above-mentioned band portion when opening the cap gradually increases.

[0018] In addition, in the synthetic resin cap described in any one of (1) to (3) above, (4) the cap body preferably maintains the posture when the cap is opened when it is rotated more than 180 degrees from the unopened state with the belt portion as the base end.

[0019] In addition, in the synthetic resin cover described in (4), preferably (5) the protrusion is set at a height from the lower end of the fixing rib so that the cover body can rotate more than the above 180 degrees.

[0020] Furthermore, in the synthetic resin cover described in any one of (1) to (5) above, preferably (6) when the cover is opened, the upper edge of the top plate is guided to drill into the upper surface of the side extension portion by the first inclined portion sliding on the side of the side extension portion.

[0021] In addition, in the synthetic resin cover described in (1) above, it is preferred that (7) the protrusion is composed of an intermediate step portion extending radially outward from the lower end of the above-mentioned first inclined portion, a shoulder portion bent downward at the outer end portion of the above-mentioned intermediate step portion, and an outer surface portion continuing from the above-mentioned shoulder portion and protruding radially outward. In order to suppress interference with the above-mentioned anti-tampering band when the above-mentioned cover is opened, a second inclined portion that becomes narrower toward the downward direction is provided at the lower end of the above-mentioned outer surface portion.

[0022] Furthermore, in the synthetic resin cover described in any one of (1) to (7) above, preferably (8) the belt portion has at least two connecting belts, and the fixing rib is disposed so as to be interposed between the two connecting belts.

[0023] In addition, in the synthetic resin cap described in any one of (1) to (8) above, preferably (9) the cap body further includes a flange portion provided on the side opposite to the fixing rib.

[0024] In addition, in the synthetic resin cover described in any one of (1) to (6) above, it is preferred that (10) the protrusion includes at least an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the intermediate step portion, and a curved portion that is continuous from the shoulder portion and gradually decreases in diameter downward, and after the jaw portion provided at the container mouth passes over the curved portion, the fixing rib contacts the side surface of the container mouth and emits a sound.

[0025] Alternatively, in order to solve the above-mentioned problems, a synthetic resin cap of one embodiment of the present invention is characterized in that it includes: (11) an anti-tampering band embedded in the outer peripheral surface of the container mouth; and a cap body having a skirt wall and a top plate, and connected to the above-mentioned anti-tampering band via a weakened portion and a band portion, and the above-mentioned skirt wall is provided with a fixing rib protruding radially outward than the above-mentioned skirt wall, and the above-mentioned fixing rib has a protrusion, which at least includes an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the above-mentioned intermediate step portion, and a curved portion that is continuous from the above-mentioned shoulder and gradually decreases in diameter downward. When opening the cap, after the jaw portion provided on the above-mentioned container mouth slides along the above-mentioned curved portion, the side surface of the above-mentioned container mouth contacts the above-mentioned protrusion, and the upper surface of the side extension portion provided below the above-mentioned container mouth and extending in the radial direction contacts the above-mentioned top plate, thereby maintaining the posture of the above-mentioned cap body when opening the cap.

[0026] Effects of the Invention

[0027] According to one embodiment of the synthetic resin cap of the present invention, since the cap body is connected to the tamper-evident band via the band portion, the cap can be prevented from falling or being lost when the cap is opened. Furthermore, when the cap is opened, the side surface of the container mouth contacts the protrusion below the first inclined portion, and the upper surface of the lateral extension below the container mouth contacts the top plate. This maintains the cap body's opened posture, further enhancing convenience during drinking.

[0028] In addition, according to another embodiment of the synthetic resin lid of the present invention, in addition to the above-mentioned effects, since the jaw provided at the mouth of the container slides along the curved portion when the lid is opened, the resistance of the jaw to the curved portion gradually increases as it goes above the upper portion, thereby preventing the drinker from inadvertently stopping to open the lid midway. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a perspective view of the appearance of the synthetic resin cover according to the first embodiment as viewed from a certain direction.

[0030] Figure 2 This is a perspective view of the appearance of the synthetic resin cover according to the first embodiment as viewed from another direction.

[0031] Figure 3 This is a plan view of the synthetic resin cover according to the first embodiment as viewed from the upper side.

[0032] Figure 4 Therefore Figure 3 AA cross-sectional view when cut along AA in FIG.

[0033] Figure 5 This is a bottom view of the synthetic resin cover according to the first embodiment as viewed from the bottom surface side.

[0034] Figure 6 This is a front view of the synthetic resin cover according to the first embodiment as viewed from the flange portion side.

[0035] Figure 7 (a) is a rear view of the synthetic resin cover of the first embodiment as viewed from the fixing rib side. Figure 7 (b) is a rear view showing another example of how the belt portion is connected to the skirt wall.

[0036] Figure 8 It is a cross-sectional view showing the structure of the fixing rib in the synthetic resin cover according to the first embodiment.

[0037] Figure 9 This is a state transition diagram for explaining the method of opening the synthetic resin cap according to the first embodiment.

[0038] Figure 10 It is a state transition diagram explaining the opening method of the synthetic resin cap of the comparative example.

[0039] Figure 11 This is a schematic diagram showing another example of the lateral extension portion of the container according to the first embodiment.

[0040] Figure 12 This is a perspective view of the appearance of the synthetic resin cover according to the second embodiment as viewed from a certain direction.

[0041] Figure 13 This is a perspective view of the appearance of the synthetic resin cover according to the second embodiment as viewed from another direction.

[0042] Figure 14 This is a plan view of the synthetic resin cover according to the second embodiment as viewed from the upper side.

[0043] Figure 15 Therefore Figure 14 AA cross-sectional view when cut along AA in FIG.

[0044] Figure 16 This is a bottom view of the synthetic resin cover according to the second embodiment as viewed from the bottom surface side.

[0045] Figure 17 (a) is a rear view of the synthetic resin cover of the second embodiment as viewed from the fixing rib side. Figure 17 (b) is a rear view showing another example of how the belt portion is connected to the skirt wall.

[0046] Figure 18 This is a cross-sectional view showing the structure of the fixing rib in the synthetic resin cover according to the second embodiment.

[0047] Figure 19 This is a state transition diagram for explaining the method of opening the synthetic resin cap according to the second embodiment.

[0048] Figure 20 It is a state transition diagram explaining the opening method of the synthetic resin cap of the comparative example.

[0049] Figure 21 This is a schematic diagram showing another example of the lateral extension portion of the container according to the second embodiment. DETAILED DESCRIPTION

[0050] Hereinafter, preferred embodiments for carrying out the present invention will be described.

[0051] In addition, in this embodiment, for the sake of convenience, the X, Y and Z directions are appropriately set in the description using the accompanying drawings, but for the sake of convenience, there is no excessive limitation to the present invention. In addition, for structures other than the structures described in detail below, the structure of known containers and lids can be appropriately cited.

[0052] [First embodiment]

[0053] Synthetic resin cover 100

[0054] Timely reference Figures 1 to 8 , and the structure of the synthetic resin cover 100 of the first embodiment will be described in detail.

[0055] like Figure 1 and Figure 2 As shown in FIG. 1 and FIG. 2 , the synthetic resin cap 100 of the first embodiment has a function of fitting with a pouring spout of a container mouth 201 of a container 200 described later, and includes at least a tamper-evident tape 10 and a cap body 20 as a so-called upper cap.

[0056] Here, as an example of a container 200 suitable for the first embodiment, a bottle such as a well-known milk bottle with a cap pressed onto the mouth of the container can be exemplified. Furthermore, the container 200 is not limited to the aforementioned bottles; it can also be applied to bottles with a cap screwed onto the mouth of a general container for storing soft drinks, tea, etc. Furthermore, polyester resins such as polyethylene terephthalate (PET) are suitable materials for the container 200. In addition, various well-known materials, such as the aforementioned glass bottles, can also be used.

[0057] The contents stored in container 200 are not particularly limited. For example, various known liquids such as milk beverages and tea and other refreshing drinks can be used. Furthermore, instead of the aforementioned liquids, known solid materials such as tablets and foods, or known semi-solid materials in a gel state can be used as the contents stored in container 200.

[0058] A portion of such a container 200 is shown Figure 1 and Figure 2As shown in the examples of the present invention, the container 200 includes a container mouth 201 having a pouring spout for pouring out the contents, an annular lateral extension 202 provided below the container mouth 201, and a main body 203 located below the lateral extension 202 (only the upper portion of the main body 203 is shown in the figure, and the lower portion is omitted). Furthermore, the annular lateral extension 202 shown in the first embodiment is provided below the container mouth 201 and functions as a neck support extending radially outward from the container mouth 201. This is a portion that is held by a conveying mechanism during conveyance of the container 200 or is held to prevent buckling of the container main body during attachment of a cap.

[0059] In addition, the lateral extension portion 202 is formed in an annular shape along the entire circumference of the container mouth portion 201 in the first embodiment, but is not limited to this form, and may be in a protrusion shape protruding in the radial direction.

[0060] In addition, the side extension portion 202 of the first embodiment is not limited to the above-mentioned ring-shaped form, and can also be Figure 11 As illustrated, the side extension portion 202 is integrated as a part of the main body 203 of the container 200 (constituting the upper side portion).

[0061] Hereinafter, as the above-mentioned side extension portion 202, Figure 1 The description will be continued by taking the neck support shown in FIG. 2 as an example (hereinafter referred to as neck support 202 ). In addition, for the structures other than those described above in the container 200 , known container structures including those described in the above-mentioned patent documents may also be applied.

[0062] The synthetic resin cap 100 of the first embodiment is preferably a snap-on cap in which an inner ring 23 (described later) is inserted into the inner side of the container mouth 201. The synthetic resin cap 100 is preferably made of a relatively soft material, such as polypropylene resin, low-density polyethylene (LDPE), or other olefin resins including polyethylene resins. However, other known synthetic resins may also be used.

[0063] The tamper-evident seal tape 10 is as follows Figure 1 、 Figure 2 and Figure 5 As can be understood by others, it has the function of being embedded in the outer peripheral surface of the container mouth 201. Figure 5 As shown, the inner circumference of the tamper-evident seal tape 10 is provided with insertion protrusions 13 at predetermined intervals, and the insertion protrusions 13 are engaged with the container mouth 201 to maintain the state of being inserted into the outer circumference of the container mouth 201. Figure 5 As exemplified in the examples, the above-mentioned fitting protrusions 13 may not be formed in the region where the fixing ribs 30 and the belt portion 12 (described later) are provided on the inner peripheral surface side of the tamper-evident tape 10 .

[0064] The cover body 20 is as follows Figure 1 and Figure 2 As shown in Figures 1 and 2, the container 200 is provided with a skirt wall 21 and a top plate 22 to form an upper cover. The skirt wall 21 is provided to hang downward from the peripheral edge of the top plate 22 so as to cover the outer peripheral surface of the container mouth 201 when the container 200 is closed.

[0065] As described above, an inner ring 23 that can fit into the pouring spout of the container mouth 201 is formed inside the top plate 22. The inner ring 23 may have any of various known shapes as long as it can seal the pouring spout.

[0066] A flange portion 40 is provided near the upper end of the skirt wall 21 on the opposite side to the fixing rib 30 described later. Figure 4 and Figure 6 It will be appreciated that the flange portion 40 of the first embodiment is preferably configured to have a width W2 that is greater than the circumferential width W1 of the fixing rib 30. This allows the user to effectively open the lid by gripping the flange portion 40 at any circumferential position. Furthermore, the width W2 of the flange portion 40 does not necessarily need to be greater than the width W1; it may be narrower than or equal to the width W1.

[0067] In addition, as shown in the figure, the flange portion 40 of the first embodiment preferably protrudes radially to the extent that the drinker can pinch the flange portion 40. This can prevent the drinker's fingers from accidentally touching the container mouth 201 when opening the lid, which is preferable from a hygienic perspective.

[0068] In addition, refer to Figure 1 、 Figure 2 、 Figure 7 (a) and Figure 8 The lid body 20 of the first embodiment is connected to the tamper-evident tape 10 at the lower edge of the skirt wall 21 via the weakened portion 11 and the tape portion 12 .

[0069] In addition, Figure 7 In (a), the belt portion 12 of the first embodiment is connected to the lower edge of the skirt wall 21, but the connection method of the belt portion 12 and the skirt wall 21 is not limited to this method. Figure 7 As shown in (b), a part of the lower edge of the skirt wall 21 may be raised upward, and the upper end of the belt portion 12 may be connected to the raised skirt wall 21.

[0070] As can be seen from these figures, the weakened portion 11 is configured to temporarily connect the tamper-evident tape 10 to the lid body 20 and has a strength sufficient to be easily broken by, for example, a user pinching the flange 40 when opening the lid. In other words, in the unopened state, the tamper-evident tape 10 and the lid body 20 are connected via the weakened portion 11. Once the lid is opened, the weakened portion 11 breaks, thus providing evidence of tampering.

[0071] Furthermore, while the weakened portions 11 of the first embodiment are provided intermittently in a plurality around the axis of the lid body 20, the present invention is not limited to this configuration. For example, instead of the above configuration, the weakened portions 11 may be formed thin-walled and continuously connect the tamper-evident tape 10 and the lid body 20 along the circumferential direction.

[0072] like Figure 2 and Figure 8 As shown, the band portion 12 is arranged on the side opposite to the flange portion 40 where the fixing rib 30 described later is provided, and has the function of permanently connecting the tamper-evident band 10 and the lid body 20 .

[0073] More specifically, as understood from these drawings, the belt portion 12 of the first embodiment is configured to include a pair of first connecting belts 12 a and second connecting belts 12 b so as to sandwich the fixing rib 30 .

[0074] For example, when the user pinches the flange portion 40 when opening the container 200, the lid body 20 remains connected to the tamper-evident tape 10 via the tape portion 12. Therefore, even during such opening, the lid body 20 does not separate from the container 200 (more precisely, the tamper-evident tape 10 embedded in the container mouth 201), thereby preventing the lid body 20 from falling off or being lost after opening.

[0075] Furthermore, in the first embodiment, the belt portion 12 has at least two connecting straps, and the fixing rib 30 is disposed between the two connecting straps. However, the first embodiment is not limited to this embodiment; for example, one, three, or more connecting straps may be provided, or different numbers of connecting straps may be provided on either side of the fixing rib 30.

[0076] In the first embodiment, as described above, the user pinches the flange 40 when opening the lid. However, in addition to this method, the user may place a finger on the lower surface of the flange 40 and push it up from below.

[0077] <Fixed rib 30>

[0078] Next, with special reference Figure 2 、 4 as well as Figure 8 , while describing in detail the structure and function of the fixing rib 30 of the first embodiment.

[0079] First, as can be understood from these figures, the cover body 20 of the first embodiment is configured to further include a cover body 20 which is suspended from the above-mentioned skirt wall 21 and extends radially outward from the skirt wall 21 (for example, Figure 2 -X direction) protruding fixing rib 30.

[0080] like Figure 2 As shown, the fixing rib 30 is provided on the side of the cover body 20 opposite to the flange portion 40. Figure 4 It can be understood that in the cover body 20 of the first embodiment, a part of the skirt wall 21 is replaced by the fixing rib 30 .

[0081] In addition, if Figure 4 As shown, the height (length in the Z direction) of the tamper-evident tape 10 located below the flange portion 40 is set to be higher than the height of the tamper-evident tape 10 located below the fixing rib 30. In other words, the tamper-evident tape 10 of the first embodiment is set to have different heights in the axial direction and in the circumferential direction. Furthermore, as described above, in the tamper-evident tape 10 of the first embodiment, the insertion protrusions 13 are provided along the circumferential direction on the inner circumferential surface, except for the positions corresponding to the fixing rib 30 and the tape portion 12.

[0082] like Figure 2 and Figure 8 As shown in the figures, the fixing rib 30 of the first embodiment is constructed to include 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 from the upper side of the top plate 22 to the lower side of the anti-tampering tape 10.

[0083] The first inclined portion 31 is formed on the top of the fixed rib and has a fan-shaped shape extending downward. Figure 8 As shown, the first inclined portion 31 is a linear inclined surface inclined at about 20° relative to the vertical direction, but the present invention is not limited thereto and may be a curved surface or an inclined surface at about 15 to 25°.

[0084] like Figure 8 As shown in FIG. 1 , 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 of the first embodiment is configured to include a surface substantially parallel to the top plate 22 and disposed between the first inclined portion 31 and a shoulder portion 33 described later.

[0085] like Figure 8 As shown in FIG. 1 , the shoulder portion 33 is a portion that curves downward at the outer end portion of the intermediate step portion 32. More specifically, the shoulder portion 33 of the first embodiment is a curved corner portion that is provided below the first inclined portion 31 and continues from the outer edge of the intermediate step portion 32 to the outer surface portion 34.

[0086] Thus, the fixing rib 30 of the first embodiment has the first inclined portion 31, the intermediate step portion 32, and the shoulder portion 33, but when it does not have these, it has a structure that is suspended from the top plate 22 like other skirt walls 21 (at Figure 8 In addition, the height of the intermediate step 32 and the shoulder 33 (the height from the lower end of the fixing rib 30) can be determined by experiments or simulations so that the rotation angle of the cover body 20 when the cover is opened is maintained at more than 180 degrees.

[0087] The outer surface portion 34 is a side surface that is continuous from the shoulder portion 33 and projects radially outward from the skirt wall 21. A lower tapered portion 35 that narrows (decreases in diameter) downward is formed on the lower side of the outer surface portion 34.

[0088] from Figures 2 to 5 as well as Figure 8 It will be appreciated that the fixing rib 30 includes the aforementioned intermediate step 32, shoulder 33, outer surface 34, and lower tapered portion 35, thereby providing a portion protruding radially outward below the first inclined portion 31. Therefore, in the first embodiment, the region of the fixing rib 30 formed by the intermediate step 32, shoulder 33, outer surface 34, and lower tapered portion 35 is defined as a "protruding portion."

[0089] The lower tapered portion 35 functions as a second inclined portion located below the first inclined portion 31 , and is provided for the purpose of suppressing interference with the tamper-evident tape 10 when the lid is opened, as will be described later.

[0090] Furthermore, a bottom surface portion 36 that constitutes the bottom surface of the fixing rib 30 and is continuous with the lower tapered portion 35 is disposed opposite to the upper surface of the tamper-evident tape 10 with a predetermined gap therebetween.

[0091] According to the synthetic resin cap 100 having the fixing rib 30 formed by the above-described various parts, when the cap is opened, (A) the side surface of the container mouth 201 can contact 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 can contact the top plate 22. Thus, the cap body 20 maintains its open posture.

[0092] As will be described later, in the first embodiment, the shoulder portion 33 of the protrusion is shown as being in contact with the side surface of the container mouth 201 (see FIG. Figure 9(c), but is not limited to this embodiment. For example, the outer surface portion 34 of the protrusion may contact the side surface of the container mouth 201. The following description uses the case where the shoulder portion 33 of the protrusion contacts the side surface of the container mouth 201 as an example.

[0093] <State Transition When Cover Opened>

[0094] Next, also use Figure 9 and Figure 10 , the method of opening the synthetic resin cap 100 according to the first embodiment will be described with reference to the state transition.

[0095] like Figure 9 As shown, when a drinker drinks the contents (e.g., milk) from the container 200, he or she first opens the synthetic resin cap 100 that seals the pouring port. Although not shown, a known package such as a shrink wrap that covers the synthetic resin cap 100 may be further added to the container 200.

[0096] When opening the lid, the drinker first pinches the flange 40 with their fingers or the like. The pinching force then breaks the weakened portion 11 temporarily connecting the tamper-evident band 10 and the lid body 20. When the weakened portion 11 breaks, the flange 40 rotates (turns over) upward with the band portion 12 as the base point, thereby releasing the inner ring 23 from the pouring spout of the container 200.

[0097] At this time, if Figure 9 As shown in FIG. 5( b ), as the lid body 20 continues the aforementioned pivoting motion, the second inclined portion (lower tapered portion 35) of the fixing rib 30 slides along and over the tamper-evident tape 10, and the first inclined portion 31 of the fixing rib 30 continues to slide along the side surface 202b of the neck support 202 of the container 200. Thus, since the fixing rib 30 has the aforementioned first inclined portion that expands in a downward fan shape, the fixing rib 30 can slide smoothly relative to the neck support 202 without becoming stuck.

[0098] Then, if Figure 9 As shown in (c), if the cover body 20 further continues the above-mentioned rotational action, the outer surface of the container mouth 201 contacts the shoulder 33 (protrusion) provided below the above-mentioned first inclined portion 31, and the upper surface 202a of the neck support member 202 provided below the container mouth 201 contacts the top plate 22, thereby achieving a state in which the posture of the cover body 20 when opening the cover is maintained (two-point contact state).

[0099] At this time, if Figure 9As shown in FIG. 2( c ), the lid body 20 preferably maintains its open position even after being rotated more than 180° from the unopened position with the belt portion 12 as the base end. While the angle from the unopened position is shown in the figure, it is maintained at approximately 225°. However, this angle is merely an example and can be adjusted appropriately depending on the position and shape of the neck support 202, the height of the shoulder portion 33, and other factors.

[0100] As described above, the shoulder portion 33 (protrusion) of the fixing rib 30 of the first embodiment is set at a height from the lower end (bottom portion 36 ) of the fixing rib 30 so that the cover body 20 can rotate when the rotation angle exceeds 180°.

[0101] And, from Figure 9 (a) to Figure 9 As can be understood from the transition to state (b), the fixing rib 30 of the first embodiment includes the second inclined portion (lower tapered portion 35) described above. Therefore, even when the lid body 20 rotates during the above-described opening operation, the fixing rib 30 itself is prevented from interfering with the tamper-evident tape 10. This prevents the lid body 20 from stopping in rotation at the initial stage of the opening operation.

[0102] In addition, from Figure 9 (b) to Figure 9 The state transition of (c) can be understood as having the following characteristics: in the synthetic resin cover 100 of the first embodiment, when the cover is opened as described above, the first inclined portion 31 of the fixing rib 30 slides on the side surface 202b of the neck support 202, so that the upper edge of the top plate 22 is guided to drill into the upper surface 202a side of the neck support 202.

[0103] With such a feature, in the first embodiment, the upper edge of the top plate 22 is prevented from digging into the lower surface 202 c of the neck support 202 , thereby preventing the tamper-evident tape 10 and the tape portion 12 from unexpectedly breaking.

[0104] Synthetic resin cover 101 as a comparative example

[0105] On the other hand, as a comparative example of the first embodiment, Figure 10 The present invention shows the state transition of the opening method using the synthetic resin cap 101 without the fixing rib 30. In this comparative example, components having the same functions and structures as those in the above embodiment are denoted by the same reference numerals, and their description is omitted.

[0106] As can be seen from the figure, the synthetic resin cover 101 of the comparative example does not have the fixing rib 30 of the first embodiment. Therefore, when the cover is opened, Figure 10 As shown in (b), the neck support 202 is difficult to slide on the skirt wall 21, and a relatively strong force is required to open the lid.

[0107] Furthermore, in the synthetic resin cover 101 of the comparative example, since the neck support 202 is difficult to slide on the skirt wall 21, Figure 10 As shown in (c), the upper surface 202a of the neck support 202 and the top plate 22 are not in contact, and the upper edge of the top plate 22 is inserted into the lower surface 202c of the neck support 202. In this case, for example, excessive force may be applied to the anti-tampering tape 10 or the tape portion 12, causing them to break. In addition, in this case, even if the tape portion 12 is prevented from breaking, the tape portion 12 will be excessively extended, and the turning radius of the upper cover (the lid body) will increase when the lid is opened, making it difficult to maintain the upper cover in a stable position after opening. If it is difficult to maintain the upper cover in a stable position, the upper cover may be accidentally released and return to the closed position during drinking, which may cause interference with the user's nose, etc. during drinking.

[0108] In contrast, according to the synthetic resin cover 100 of the first embodiment, when the cover is opened, the first inclined portion 31 of the fixing rib 30 slides on the side surface 202b of the neck support 202, so that the upper cover (the upper edge of the top plate 22) is guided to drill into the upper surface 202a side of the neck support 202.

[0109] Then, the side surface of the container mouth portion 201 contacts the shoulder portion 33 (protrusion) of the fixing rib 30 , and the upper surface 202 a of the neck support 202 contacts the top plate 22 (two-point contact state).

[0110] With such features, in the first embodiment, the upper edge of the top plate 22 can be prevented from digging into the lower surface 202c of the neck support 202, enabling rotation of 180° or more, and preventing accidental breakage of the tamper-evident tape 10 and the tape portion 12.

[0111] As described above, the synthetic resin cover 100 of the first embodiment may include the above-mentioned second inclined portion (lower tapered portion 35 ) in the fixing rib 30 .

[0112] For example, in order to more effectively achieve the above-mentioned 180° or more upper cover flipping, it is preferred that the fixing rib 30 protrudes radially outward to a certain extent, and the anti-tampering band 10 passes over the fixing rib 30 when the cover is opened, but this can be achieved by the fixing rib 30 having the second inclined portion.

[0113] As described above, it is obvious that there is a great difference between the synthetic resin cap 100 of the first embodiment and the synthetic resin cap 101 of the comparative example in not only the openability (ease of opening) but also the stability (no accidental breakage).

[0114] In addition, in the synthetic resin cover 100 of the first embodiment, by having the above-mentioned characteristic matters, even if the axial dimension of the synthetic resin cover 100 is reduced, for example, a large upper cover flip (for example, a rotation angle exceeding 180°) can be achieved with relatively less resin material, which can achieve the above-mentioned effect and further achieve cost reduction.

[0115] [Second embodiment]

[0116] Next, a second embodiment for preferably carrying out the present invention will be described.

[0117] In addition, in this embodiment, the same reference numerals are used for components and components having the same functions as those described in the first embodiment, and their descriptions are omitted as appropriate. Therefore, the following description will continue focusing on the differences from the first embodiment.

[0118] Synthetic resin cover 110

[0119] While referring to Figures 12 to 18 , while describing in detail the structure of the synthetic resin cover 110 of the second embodiment.

[0120] like Figure 12 and Figure 13 As shown in FIG. 1 and FIG. 2 , the synthetic resin cap 110 of the second embodiment has a function of fitting with a container mouth 210 of a container 200 described later, and includes at least a tamper-evident tape 10 and a cap body 20 as a so-called upper cap.

[0121] like Figure 12 、 Figure 13 、 Figure 19 and Figure 20 As shown in the examples of , etc., such a container 200 is configured to include a container mouth 210, an annular side extension 213 provided below the container mouth 210, and a main body 220 located below the side extension 213 (in the figure, only the upper portion of the main body 220 is shown, and the lower portion is omitted). The container mouth 210 is configured to include a pouring portion 211 having a pouring spout for pouring the contents, and a reduced diameter portion 212 into which the tamper-evident tape 10, described later, is inserted.

[0122] In addition, since the reduced diameter portion 212 shown in the second embodiment is a portion having a reduced diameter below the pouring portion 211, as shown in FIG. Figure 19 As shown in FIG. 1 and FIG. 2 , a jaw portion 211 a is formed below the pouring portion 211 of the second embodiment. The jaw portion 211 a is continuous with the diameter-reducing portion 212 and gradually reduces in diameter downward.

[0123] The annular lateral extension portion 213 is arranged below the container mouth 210, and functions as a neck support member that extends radially outward compared to the container mouth 210. For example, it can be used as a portion held by a conveying mechanism when conveying the container 200, or held when installing the lid to prevent the container body from being buckled.

[0124] In the second embodiment, the lateral extension portion 213 is formed in an annular shape along the entire circumference of the container mouth portion 210 , but the present invention is not limited to this form and may be in a protrusion shape protruding in the radial direction.

[0125] In addition, the side extension portion 213 of the second embodiment is not limited to the above-mentioned ring-shaped form, for example, it can also be as follows Figure 21 As illustrated, the side extension portion 213 is integrated as a part of the main body 220 of the container 200 (constituting the upper side portion).

[0126] Hereinafter, as the above-mentioned side extension portion 213, Figure 12 The description will be continued by taking the neck support shown in FIG. 2 as an example (hereinafter referred to as neck support 213 ). In addition, for the structures other than those described above in the container 200 , known container structures including those described in the above-mentioned patent documents may also be applied.

[0127] The synthetic resin cap 110 of the second embodiment is preferably a press-on cap in which an inner ring 23 (described later) is inserted into the inner side of the container mouth 210. The synthetic resin cap 110 is preferably made of a relatively soft material, such as polypropylene resin, low-density polyethylene (LDPE), or other olefin resins including polyethylene resins. However, other known synthetic resins may also be used.

[0128] The cover body 20 is as follows Figure 12 and Figure 13 As shown in FIG. 1 , the container 200 is provided with a skirt wall 21 and a top plate 22 to constitute an upper cover. The skirt wall 21 is provided to hang downward from the peripheral edge of the top plate 22 so as to cover at least a portion of the outer peripheral surface of the container mouth 210 when the container 200 is closed.

[0129] <Fixed rib 30>

[0130] Next, with special reference Figure 13 、 Figure 15 as well as Figure 18 , while describing in detail the structure and function of the fixing rib 30 of the second embodiment.

[0131] First, as can be understood from these figures, the cover body 20 of the second embodiment is configured to further include a cover body 20 which is suspended from the above-mentioned skirt wall 21 and extends radially outward from the skirt wall 21 (for example, Figure 13 -X direction) protruding fixing rib 30.

[0132] like Figure 13 As shown, the fixing rib 30 is provided on the side of the cover body 20 opposite to the flange portion 40. Figure 15 It can be understood that in the cover body 20 of the present embodiment, a part of the skirt wall 21 is replaced by the fixing rib 30 .

[0133] In addition, if Figure 15 As shown, the height (length in the Z direction) of the tamper-evident tape 10 below the flange portion 40 is set to be greater than the height of the tamper-evident tape 10 below the fixing rib 30. In other words, the tamper-evident tape 10 of this embodiment is set to have different heights in the axial direction and in the circumferential direction. Furthermore, as described above, in the tamper-evident tape 10 of this embodiment, the insertion protrusions 13 are provided along the circumferential direction on the inner circumferential surface, except for the positions corresponding to the fixing rib 30 and the tape portion 12.

[0134] like Figure 13 、 Figure 15 and Figure 18 As shown in FIG. 1 , the fixing rib 30 of this embodiment includes a first inclined portion 31 , an intermediate step portion 32 , a shoulder portion 33 , a curved portion 37 , and a lower bottom portion 38 from the upper side on the top plate 22 side to the lower side on the tamper-evident tape 10 side.

[0135] The first inclined portion 31 is formed on the top of the fixed rib and has a fan-shaped shape extending downward. Figure 18 As shown, the first inclined portion 31 is a linear inclined surface inclined at about 20° relative to the vertical direction, but the present invention is not limited thereto and may be a curved surface or an inclined surface at about 15 to 25°.

[0136] like Figure 18 As shown in FIG. 1 , 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 of this embodiment is configured to include a surface substantially parallel to the top plate 22 and disposed between the first inclined portion 31 and a shoulder portion 33 described later.

[0137] like Figure 18 As shown in FIG. 1 , the shoulder portion 33 is a portion that curves downward at the outer end of the intermediate step portion 32. More specifically, the shoulder portion 33 of this embodiment is a curved corner portion that is provided below the first inclined portion 31 and continues from the outer edge of the intermediate step portion 32 to the curved portion 37.

[0138] In addition, the setting height of the intermediate step portion 32 and the shoulder portion 33 (the height from the lower end of the fixing rib 30) can be determined by experiments or simulations that also take into account the material of the synthetic resin cover 100, so that the rotation angle of the cover body 20 when opening the cover is maintained at more than 180°.

[0139] like Figure 18 As shown in FIG. 3 , the curved portion 37 is a portion that continues from the shoulder portion 33 and gradually tapers downward. As can be understood from this figure, the curved portion 37 is a side surface that protrudes radially outward from the skirt wall 21. When the lid is opened, the jaw 211a provided on the container mouth 210 (pour portion 211) can slide along this curved line.

[0140] In addition, from Figure 18 As can be understood, the curved portion 37 of this embodiment is preferably formed of a curved surface that convexly projects upward when the lid body 20 is sealed against the container mouth 210, so that the force required to flip the lid body 20 via the belt portion 12 gradually increases during opening. This, as described above, can prevent the user from accidentally stopping the opening action midway during opening.

[0141] In addition, although the curved portion 37 of this embodiment is formed by a curved surface that convexly projects upward when the container mouth 210 is sealed, this configuration is not limited thereto as long as the aforementioned function is achieved. For example, the curved surface of the curved portion 37 may have a curvature that is approximately linear.

[0142] In addition, for example, in the case of omitting the mode in which the resistance of the jaw portion 211a gradually increases as it passes over the curved portion 37, the curved portion 37 may be directed downward (at Figure 18 A second tapered inclined portion (not shown) whose diameter decreases in the same manner (in the direction from the shoulder portion 33 toward the lower bottom surface portion 38) is interposed between the shoulder portion 33 and the lower bottom surface portion 38.

[0143] like Figure 18 As shown in FIG. 1 and FIG. 2 , the lower bottom portion 38 is disposed below the curved portion 37. The lower bottom portion 38 is configured to include a bottom surface that is substantially parallel to the top plate 22. In this embodiment, the lower bottom portion 38 is disposed opposite the upper surface of the tamper-evident tape 10 so as to have a predetermined gap therebetween.

[0144] from Figures 13 to 16 and Figure 18 It will be appreciated that the fixing rib 30 includes the aforementioned intermediate step 32, shoulder 33, and curved portion 37, thereby providing a portion protruding radially outward below the first inclined portion 31. Therefore, in the second embodiment, the region of the fixing rib 30 formed by the intermediate step 32, shoulder 33, and curved portion 37 is defined as a "protruding portion."

[0145] In the second embodiment, the curved portion 37 and the lower bottom surface portion 38 are formed in a continuous manner, but the present invention is not limited to this manner. For example, a third inclined portion (not shown) that decreases in diameter downward may be interposed between the curved portion 37 and the lower bottom surface portion 38. By providing such a third inclined portion, for example, when the lid is opened, interference with the tamper-evident tape 10 can be further suppressed.

[0146] According to the synthetic resin lid 110 having the fixing rib 30 formed by the above-described various parts, when the lid is opened, (A) the side surface of the container mouth 210 contacts the protrusion (shoulder 33) provided below the first inclined portion 31, and (B) the upper surface 213a of the neck support 213 provided below the container mouth 210 contacts the top plate 22. Thus, the lid body 20 maintains its open posture.

[0147] In addition, as described later, in this embodiment, the shoulder portion 33 of the protrusion is in contact with the side surface of the container mouth portion 210 (see FIG. Figure 19 (c), but is not limited to this embodiment. For example, the curved portion 37 constituting the protrusion may contact the side surface of the container mouth 210. The following description uses the example of the protrusion's shoulder 33 contacting the side surface of the container mouth 210.

[0148] <State Transition When Cover Opened>

[0149] Next, also use Figure 19 and Figure 20 , the method of opening the synthetic resin cover 110 of this embodiment will be described with reference to state transition.

[0150] like Figure 19 As shown, when a drinker drinks the contents (e.g., milk) from the container 200, he or she first opens the synthetic resin cap 110 that seals the pouring port. Although not shown, a known package such as a shrink wrap that covers the synthetic resin cap 110 may be further added to the container 200.

[0151] When opening the lid, the drinker first pinches the flange 40 with their fingers or the like. The pinching force then breaks the weakened portion 11 temporarily connecting the tamper-evident band 10 and the lid body 20. Once the weakened portion 11 breaks, the flange 40 rotates (turns over) upward with the band portion 12 as a base point, allowing the inner ring 23 to detach from the pouring spout of the container 200.

[0152] At this time, if Figure 19As shown in FIG. 2 (b), as the lid body 20 continues its rotational motion, the jaw 211a of the pouring portion 211 of the container mouth 210 slides along the curved portion 37. As described above, in this embodiment, the curved surface of the curved portion 37 is configured to bulge upward when the container mouth 210 is sealed. Therefore, the force felt by the drinker to open the lid gradually increases with the rotational motion.

[0153] Then, while the jaw portion 211a slides on the curved surface of the curved portion 37, the first inclined portion 31 of the fixing rib 30 slides on the side surface 213b of the neck support 213 of the container 200. Thus, since the fixing rib 30 is provided with the first inclined portion 31 that expands in a downward fan shape, the fixing rib 30 can slide smoothly relative to the neck support 213 without getting stuck.

[0154] Then, if Figure 19 As shown in (c), if the lid body 20 further continues the above-mentioned rotational action, after the jaw portion 211a provided at the container mouth 210 (pouring portion 211) slides along the curved portion 37, the outer side surface of the container mouth 210 contacts the shoulder 33 (protrusion) provided below the above-mentioned first inclined portion 31, and the upper surface 213a of the neck support member 213 provided below the container mouth 210 contacts the top plate 22, thereby achieving a state in which the posture of the lid body 20 when opening the lid is maintained (two-point contact state).

[0155] At this time, if Figure 19 As shown in FIG. 2( c ), the lid body 20 preferably maintains its open position after being rotated more than 180° from the unopened position with the belt portion 12 as the base end. While the angle from the unopened position is maintained at approximately 225° in the illustration, this angle is merely an example and can be adjusted appropriately depending on the position and shape of the neck support 213, the height of the shoulder portion 33, and other factors.

[0156] Thus, the shoulder portion 33 (protrusion) of the fixing rib 30 of this embodiment is set at a height from the lower end (bottom portion 36 ) of the fixing rib 30 so that the cover body 20 can rotate at the aforementioned rotation angle exceeding 180°.

[0157] In addition, from Figure 19 (b) to Figure 19 The state transition of (c) can be understood as having the following characteristics: in the synthetic resin cover 110 of this embodiment, when the cover is opened as described above, the first inclined portion 31 of the fixing rib 30 slides on the side surface 213b of the neck support 213, and the upper edge portion 22e of the top plate 22 is guided to drill into the upper surface 213a side of the neck support 213.

[0158] With such features, in this embodiment, the upper edge 22e of the top plate 22 is prevented from digging into the lower surface 213c of the neck support 213, thereby preventing the tamper-evident tape 10 and the tape portion 12 from unexpectedly breaking.

[0159] In addition, in this embodiment, Figure 19 (b) to Figure 19 During the transition to state (c), after the jaw 211a provided on the container mouth 210 passes over the curved portion 37, the fixing rib 30 is configured to produce a sound by contacting the side surface of the container mouth 210 through cooperation with the tamper-evident tape 10 (due to elastic deformation). Therefore, in addition to gradually increasing the opening force described above, the drinker can also detect the completion of the opening operation through hearing (due to the contact sound).

[0160] Synthetic resin cover 111 as a comparative example

[0161] On the other hand, as a comparative example of this embodiment, Figure 20 The state transition of the opening method using the synthetic resin cover 111 without the fixing rib 30 is shown. In this comparative example, components having the same functions and structures as those in the above embodiment are denoted by the same reference numerals, and their description is omitted.

[0162] As can be seen from the figure, since the synthetic resin cover 111 of the comparative example does not have the fixing rib 30 of the present embodiment, when the cover is opened, for example, Figure 20 As shown in (b), the neck support 213 is difficult to slide on the skirt wall 21, and a relatively strong force is required to open the lid.

[0163] Furthermore, in the synthetic resin cover 111 of the comparative example, since the neck support 213 is difficult to slide on the skirt wall 21, Figure 20 As shown in (c), the upper surface 213a of the neck support 213 is not in contact with the top plate 22, and the upper edge of the top plate 22 digs into the lower surface 213c of the neck support 213. In this case, for example, excessive force may be applied to the tamper-evident tape 10 and the tape portion 12, causing them to break.

[0164] Furthermore, in this case, even if the band portion 12 is prevented from breaking, the band portion 12 will be excessively extended, increasing the turning radius of the upper cover (the lid body) when opening the lid, making it difficult to maintain a stable fixation of the upper cover after opening. Furthermore, if it is difficult to maintain a stable fixation of the upper cover, the upper cover may be accidentally released and return to the closed position during drinking, which may cause interference with the user's nose, etc., during drinking.

[0165] In contrast, according to the synthetic resin cover 110 of the second embodiment, when the cover is opened, the first inclined portion 31 of the fixing rib 30 slides on the side surface 213b of the neck support 213, thereby guiding the upper cover (the upper edge of the top plate 22) by drilling into the upper surface 213a side of the neck support 213.

[0166] Then, the side surface of the container mouth portion 210 contacts the shoulder portion 33 (protrusion) of the fixing rib 30 , and the upper surface 213 a of the neck support 213 contacts the top plate 22 (two-point contact state).

[0167] By having such a feature, even in the second embodiment, the upper edge of the top plate 22 can be prevented from digging into the lower surface 213c side of the neck support 213, and rotation of 180° or more can be performed, while unexpected breakage of the tamper-evident tape 10 and the tape portion 12 can be prevented.

[0168] In the synthetic resin lid 110 of the second embodiment, a modified example is shown in which the second inclined portion is interposed between the shoulder portion 33 and the lower bottom surface portion 38 as another form of the curved portion 37 in the fixing rib 30. However, in addition to maintaining the curved portion 37 (the first form of the curved portion 37) in a shape that gradually increases the resistance during upward movement, the second inclined portion as the second form of the curved portion 37 may be interposed between the first form of the curved portion 37 and the lower bottom surface portion 38. For example, in order to more effectively achieve the above-mentioned 180° or greater flipping of the lid, it is preferable that the fixing rib 30 protrudes radially outward to a certain extent so that the tamper-evident tape 10 passes over the fixing rib 30 when the lid is opened. However, by having the fixing rib 30 have both the first and second forms of the curved portion 37, this action can be more easily achieved.

[0169] As described above, it is obvious that the synthetic resin cap 110 of the second embodiment and the synthetic resin cap 111 of the comparative example differ greatly not only in the openability (ease of opening) but also in the stability (no accidental breakage).

[0170] In addition, in the synthetic resin cover 110 of the second embodiment, by having the above-mentioned characteristic matters, even if the axial dimension of the synthetic resin cover 110 is reduced, for example, a large upper cover flip (for example, a rotation angle exceeding 180°) can be achieved with relatively less resin material, which can achieve the above-mentioned effect and further achieve cost reduction.

[0171] The above-described embodiments are merely examples, and various modifications are possible without departing from the spirit of the present invention. For example, an inner ring 23 is provided on the inner side (bottom surface) of the top plate 22 of the synthetic resin cover 110. However, a known gasket or the like may be provided on the bottom surface of the top plate 22 in place of or in addition to the inner ring 23.

[0172] Furthermore, the axial (height, Z-direction) position of the flange 40 in each embodiment can be appropriately changed based on the desired opening force of the drinker. Specifically, the flange 40 can be positioned higher or lower than the intermediate step 32 of the fixing rib 30 in the axial direction.

[0173] Industrial Applicability

[0174] The present invention is suitable for realizing a cap that can suppress the cap from falling off or being lost when opening the cap and further improve the convenience during drinking.

[0175] Description of Reference Signs

[0176] 100, 101, 110, 111 synthetic resin cover

[0177] 10 Tamper-evident tape

[0178] 20 Cover body

[0179] 21 Skirt wall

[0180] 22 Top Plate

[0181] 23 Inner Ring

[0182] 30 fixed ribs

[0183] 31 First inclined portion

[0184] 32 Middle step

[0185] 33 Shoulders

[0186] 34 Lateral face

[0187] 35 Lower tapered portion

[0188] 36 bottom part

[0189] 37 Bend

[0190] 38 lower bottom part

[0191] 40 flange

[0192] 200 containers

[0193] 201 container mouth

[0194] 202 Neck support (an example of a lateral extension)

[0195] 210 container mouth

[0196] 211 pouring part

[0197] 212 reduced diameter part

[0198] 213 Neck support (an example of a lateral extension)

[0199] 220 main body

Claims

1. A synthetic resin cover, characterized in that: The synthetic resin cover comprises: a tamper-evident seal embedded in the outer peripheral surface of the container mouth; and The cover body has a skirt wall and a top plate, and is connected to the anti-tampering band via a weakened portion and a band portion. The skirt wall is provided with a fixing rib protruding radially outward from the skirt wall. The fixing rib is formed by a first inclined portion fan-shapedly extending downward and a protruding portion provided below the first inclined portion. When the lid is opened, the side surface of the container mouth contacts the protrusion, and the upper surface of the side extension portion provided below the container mouth and extending in the radial direction contacts the top plate, thereby maintaining the posture of the lid body when the lid is opened.

2. A synthetic resin cover, characterized in that: The synthetic resin cover comprises: a tamper-evident seal embedded in the outer peripheral surface of the container mouth; and The cover body has a skirt wall and a top plate, and is connected to the anti-tampering band via a weakened portion and a band portion. The skirt wall is provided with a fixing rib protruding radially outward from the skirt wall. The fixing rib has a protrusion, which includes at least an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the intermediate step portion, and a curved portion that continues from the shoulder portion and gradually decreases in diameter downward. When the lid is opened, after the jaw provided on the container mouth slides along the curved portion, the side surface of the container mouth contacts the protrusion, and the upper surface of the side extension portion provided below the container mouth and extending in the radial direction contacts the top plate, thereby maintaining the posture of the lid body when the lid is opened. The protruding portion further includes a first inclined portion that is disposed above the intermediate step portion and expands in a fan shape downward from the top plate.

3. The synthetic resin cover according to claim 2, wherein: The curved portion is formed of a curved surface that convexly projects upward when the cap body seals the container mouth, so that the opening force required for turning the cap body via the band portion during opening gradually increases.

4. The synthetic resin cover according to any one of claims 1 to 3, wherein: The cap body maintains the posture when the cap is opened in a state where the cap body is rotated more than 180 degrees from the unopened state with the belt portion as a base end.

5. The synthetic resin cover according to claim 4, wherein: The height of the protrusion from the lower end of the fixing rib is set so that the cover body can rotate beyond the 180°.

6. The synthetic resin cover according to any one of claims 1 to 5, wherein: When the cover is opened, the first inclined portion slides on the side surface of the lateral extension portion, whereby the upper edge of the top plate is guided to dig into the upper surface of the lateral extension portion.

7. The synthetic resin cover according to claim 1, wherein The protrusion is composed of an intermediate step portion extending radially outward from the lower end of the first inclined portion, a shoulder portion bent downward at the outer end portion of the intermediate step portion, and an outer surface portion continuous from the shoulder portion and protruding radially outward. In order to suppress interference with the tamper-evident band when the lid is opened, a second inclined portion that becomes narrower toward the bottom is provided at the lower end of the outer surface portion.

8. The synthetic resin cover according to any one of claims 1 to 7, wherein The belt portion has at least two connecting belts, The fixing rib is disposed so as to be interposed between the two connecting belts.

9. The synthetic resin cover according to any one of claims 1 to 8, wherein The cover body further includes a flange portion provided on the opposite side of the fixing rib.

10. The synthetic resin cover according to any one of claims 1 to 6, wherein The protrusion at least includes an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the intermediate step portion, and a curved portion that continues from the shoulder portion and gradually decreases in diameter downward. After the jaw provided at the container mouth passes over the curved portion, the fixing rib contacts the side surface of the container mouth and generates a sound.

11. A synthetic resin cover, characterized in that: The synthetic resin cover comprises: a tamper-evident seal embedded in the outer peripheral surface of the container mouth; and The cover body has a skirt wall and a top plate, and is connected to the anti-tampering band via a weakened portion and a band portion. The skirt wall is provided with a fixing rib protruding radially outward from the skirt wall. The fixing rib has a protrusion, which includes at least an intermediate step portion extending radially outward, a shoulder portion bent downward at the outer end portion of the intermediate step portion, and a curved portion that continues from the shoulder portion and gradually decreases in diameter downward. When opening the lid, after the jaw provided at the container mouth slides along the curved portion, the side surface of the container mouth contacts the protrusion, and the upper surface of the side extension portion provided below the container mouth and extending in the radial direction contacts the top plate, thereby maintaining the posture of the lid body when opening the lid.

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