Hinge cap

Abstract

To provide a hinge cap capable of reducing an opening strength required for opening an opening scheduled part disposed in an opening utilizing characteristics of a structure of the hinge cap.SOLUTION: An easy opening structure 50 comprises: a support pillar 51 rising from near the outer peripheral edge of an opening scheduled part 16 and positioned on a side opposite to a hinge via a cap axial center in a cap radial direction; a hook holder 52 provided at the tip of the support pillar 51; a pulling part 53 dropping from the inner top surface of an upper lid 7 in the cap axial center direction; and a hook 54 reversed to the inner top surface of the upper lid 7 at the tip of the pulling part 53. The hook 54 is engaged with the hook holder 52 in the cap axial center direction from an inside plug 13 toward the inner top surface of the upper lid 7.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a hinge cap, and more particularly to a technique for facilitating an opening operation. [Background technology]

[0002] Conventionally, there is a cap as described in, for example, Patent Document 1. This cap has a detachable member provided on the cap body that detaches from the cap body due to rupture of a weakened portion when the lid is opened, thereby opening the pouring hole of the cap body.

[0003] The release member has a release side tube, the lid has a lid side insert to be inserted into the release side tube, the release side tube has a release side bent piece bent inward, the lid side insert has a lid side bent piece bent outward, and the lid side bent piece and the release side bent piece engage with each other, so that the release member and the lid are released from the cap body together.

[0004] Patent Document 2 describes a plug consisting of a spout and a cap attached to the spout. The cap has a hook member on the underside of the top plate, the spout has a cutout at the opening position of the sealing plate of the pouring tube, and a support with a pull ring is erected on the upper surface of the cutout. When the cap is opened, the hook member engages with the pull ring to detach the cutout.

[0005] Furthermore, the container lid described in Patent Document 3 has a locking means disposed on the upper surface of the removal area of ​​the inside plug, and a locking means disposed on the inner surface of the outer lid. The locking means includes a first flap, and the locking means includes a second flap. When the outer lid is opened, the first flap and the second flap are engaged with each other, and the removal area is released from the inside plug. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2021-095174 [Patent Document 2] Patent Publication No. 2000-128217 [Patent Document 3] Patent No. 5901198 Summary of the Invention [Problem to be solved by the invention]

[0007] Conventionally, some caps have an opening portion disposed at an opening to seal the opening, and the opening portion is connected to the surrounding area by a weakened portion. This weakened portion needs to have a certain degree of opening strength, and a finger opening force is required to break the weakened portion, remove the opening portion, and open the opening. There are various structures for means for easily breaking the weakened portion, and one example is a pull ring. However, if the diameter of the pull ring is small, it may be difficult to insert fingers into the pull ring or to pinch it.

[0008] The present invention is devised to solve the above-mentioned problems, and aims to provide a hinge cap that can utilize the structural characteristics of the hinge cap and reduce the opening strength required to open the opening portion that is placed at the opening. [Means for solving the problem]

[0009] In order to achieve the above object, the hinge cap of the present invention has a cap body to be attached to the mouth of a container, a top lid which is integral with the cap body via a hinge, and an easy-open structure, wherein the cap body has an inner plug which closes the mouth opening, and an intended opening portion which seals the inner plug opening provided in the inner plug and is integral with the inner plug via a weakened portion, and the easy-open structure has a support portion which rises from near the outer peripheral edge of the intended opening portion in the cap axial direction and is located on the opposite side of the hinge via the cap axis in the cap radial direction, a hook holding portion provided at the tip of the support portion, a pull-out portion which hangs down from the inner top surface of the top lid in the cap axial direction, and a hook portion at the tip of the pull-out portion which is inverted toward the inner top surface of the top lid, and is characterized in that the hook portion engages with the hook holding portion in the cap axial direction from the inner plug toward the inner top surface of the top lid.

[0010] In addition, in the hinge cap of the present invention, the easy-open structure is characterized in that, in a cross section including the cap axis and the axis of the support portion, a plane including the outer edge of the intended opening portion and the weakened portion is inclined at an acute angle to the axis of the support portion.

[0011] In addition, in the hinge cap of the present invention, the easy-open structure is characterized in that the weakened portion has a fracture starting point at a portion that faces the hinge via the cap axis in the cap radial direction, and the outer peripheral edge on one side of the intended opening portion and the outer peripheral edge on the other side, which are separated by the fracture starting point of the weakened portion, form an acute angle.

[0012] In addition, in the hinge cap of the present invention, the easy-open structure is characterized in that the hook holding portion comprises a pull ring integrally formed on the support portion, the hook portion comprises a plurality of flaps integrally formed at the tip of the pull-out portion, the flap regulating portion provided in the intended opening portion penetrates into the inside of the pull ring to form a flap insertion gap between it and the pull ring, and the pair of flaps of the hook portion engage with the pull ring on both sides via the support portion, and the tip of the flap penetrates into the flap insertion gap.

[0013] In addition, in the hinge cap of the present invention, the easy-open structure portion is characterized in that the hook portion has a sub-flap that faces the support portion via the cap axis in the cap radial direction, and the sub-flap engages with the pull ring and enters the flap insertion gap.

[0014] Furthermore, in the hinge cap of the present invention, the easy-open structure is characterized in that the top cover has a pull ring pressing portion on the inner top surface thereof that faces the support portion in the cap radial direction via the cap axis, and the pull ring pressing portion has a structure that presses the pull ring toward the inner plug.

[0015] In addition, in the hinge cap of the present invention, the easy-open structure is characterized in that a pair of flaps of the hook portion that engage with the pull ring on both sides via the support portion extend circumferentially around the cap over a range that exceeds half the circumference of the cap.

[0016] In addition, in the hinge cap of the present invention, the easy-open structure has an initial opening region on the side facing the hinge via the cap axis in the cap radial direction, and the initial opening region is characterized in that in a cross section including the cap axis and the axis of the support portion, a plane including the outer edge of the intended opening portion and the weakened portion is inclined at an acute angle to the axis of the support portion. Effect of the Invention

[0017] With the above configuration, when the top lid is rotated around the hinge during the initial opening operation to open the intended opening portion, the hook portion of the easy-to-open structure engages with the hook holding portion, the opening force applied to the top lid is applied to the intended opening portion via the easy-to-open structure, the weakened portion breaks, the top lid and the intended opening portion move together via the easy-to-open structure, and the intended opening portion detaches from the inner plug.

[0018] At that time, since the support portion of the easy-to-open structure is located near the outer peripheral edge of the intended opening portion and on the opposite side of the hinge via the cap axis in the cap radial direction, the opening force applied by the rotational movement of the top cover around the hinge acts biasedly on the weakened portion on one side of the intended opening portion, and a relatively weak opening force causes a breaking point of the weakened portion to occur, and following the rotational movement of the top cover around the hinge, the breaking point of the weakened portion gradually moves along the outer peripheral edge of the intended opening portion toward the hinge, and the weakened portion breaks along the entire outer peripheral edge of the intended opening portion, causing the intended opening portion to detach from the inner plug, and the intended opening portion of the inner plug opening can be easily opened.

[0019] Furthermore, the easy-open structure of the present invention has a structure in which the plane including the outer circumferential edge of the intended opening and the weakened portion is inclined at an acute angle relative to the axis of the support portion.

[0020] As a result, the opening force acting on the weakened portion via the support portion and the intended opening portion due to the rotational movement of the top cover around the hinge is concentrated at the breaking point rather than being dispersed throughout the weakened portion, and the weakened portion breaks with a relatively weak opening force.

[0021] Furthermore, in the easy-to-open structure of the present invention, at the fracture starting point of the weakened portion located at the portion opposite the hinge via the cap axis in the cap radial direction, the outer peripheral edge on one side of the intended opening portion and the outer peripheral edge on the other side of the fracture starting point form an acute angle, so that the opening force acts in a concentrated manner on the fracture starting point of the weakened portion, and the fracture starting point of the weakened portion occurs with a relatively weak opening force.

[0022] In addition, in the easy-open structure of the present invention, the hook holding portion consists of a pull ring, the hook portion consists of a flap, and the flap regulating portion forms a flap insertion gap between it and the pull ring, and the pair of flaps engage with the pull ring at both side positions via the support portion, and the tip of the flap enters the flap insertion gap, so that the engagement between the flap and the pull ring is securely maintained.

[0023] In addition, in the easy-open structure of the present invention, the sub-flap that faces the support part via the cap axis in the cap radial direction engages with the pull ring and enters the flap insertion gap, preventing the pull ring from deforming or wobbling when the pull ring is pulled up. This suppresses the loss of the opening force due to the pull ring deformation, and the input opening force works effectively for opening.

[0024] In addition, in the easy-open structure of the present invention, the pull ring pressing portion, which faces the support portion across the cap axis in the cap radial direction, presses the pull ring toward the inner plug, preventing the pull ring from deforming when pulled up. This suppresses loss of opening force due to deformation or wobbling of the pull ring, and ensures that the input opening force is effective for opening.

[0025] Furthermore, in the easy-open structure of the present invention, the flap that engages with the pull ring extends circumferentially around the cap over a range that exceeds half the circumference of the cap, thereby increasing the length over which the flap engages with the pull ring and the flap pulls up the pull ring in a stable position, thereby suppressing loss of opening force due to deformation of the pull ring and ensuring that the input opening force acts effectively for opening.

[0026] Furthermore, the easy-open structure of the present invention has a structure in which, in the initial opening region, the plane including the outer circumferential edge of the intended opening portion and the weakened portion is inclined at an acute angle relative to the axis of the support portion.

[0027] For this reason, in the initial opening area, the opening force acting on the weakened portion through the support portion and the intended opening portion due to the rotational movement of the top cover around the hinge acts concentratedly at the breaking point rather than being distributed throughout the weakened portion, and the weakened portion breaks with a relatively weak opening force. [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a top view of a hinge cap according to an embodiment of the present invention in an unopened state with the top lid open; [Diagram 2] FIG. 13 is a cross-sectional view of the hinge cap according to the embodiment in an unopened state with the top lid open. [Diagram 3] FIG. 3 is a cross-sectional view of the hinge cap according to the embodiment in an unopened and upper lid-closed state; [Figure 4] FIG. 13 is a cross-sectional view showing an initial state of an opening operation of the hinge cap according to the embodiment; [Diagram 5] FIG. 13 is a cross-sectional view showing the state immediately after the weakened portion is broken during the opening and closing operation of the hinge cap according to the embodiment. [Figure 6] FIG. 13 is a cross-sectional view showing a state in which the hinge cap according to the embodiment is used after an opening and unsealing operation. [Figure 7] Enlarged view of part A in Fig. 4 [Figure 8] FIG. 4 is a front view of the hinge cap according to the embodiment; [Figure 9] FIG. 4 is a rear view of the hinge cap according to the embodiment; [Figure 10] FIG. 13 is a bottom view of the hinge cap according to the embodiment in an unopened state with the top lid closed; [Figure 11] FIG. 13 is a top view of a hinge cap according to another embodiment of the present invention in an unopened state with the top lid open; [Figure 12] FIG. 13 is a cross-sectional view of the hinge cap according to the embodiment in an unopened state with the top lid open. [Figure 13] FIG. 3 is a cross-sectional view of the hinge cap according to the embodiment in an unopened and upper lid-closed state; [Figure 14] FIG. 13 is a cross-sectional view showing an initial state of an opening operation of the hinge cap according to the embodiment; [Figure 15] FIG. 13 is a cross-sectional view showing the state immediately after the weakened portion is broken during the opening and closing operation of the hinge cap according to the embodiment. [Figure 16] FIG. 13 is a cross-sectional view showing the final state of the opening and unsealing operation of the hinge cap according to the embodiment. [Figure 17] FIG. 13 is a cross-sectional view showing a state in which the hinge cap according to the embodiment is used after an opening and unsealing operation. [Figure 18] Enlarged view of part B in Figure 14 [Figure 19] FIG. 13 is a bottom view of the hinge cap according to the embodiment in an unopened state with the top lid closed; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a cap according to the present invention will be described with reference to the drawings. Example 1 As shown in Figures 1 to 10, the hinge cap 1 has a cap body 4 that is attached to the mouth 3 of a container 2, and a top lid 7 that is integrated with the cap body 4 via a hinge 5 and a band 6 and rotates around the hinge to open and close, and has an easy-to-open structure 50 between the cap body 4 and the top lid 7.

[0030] The top lid 7 has a flange 8 on its outer surface that provides a finger hook at a position corresponding to the hinge 5 in the radial direction of the container 2, and the flange 8 is provided on one side in the axial direction of the cap, in this case at a position that continues to the top surface of the top lid 7. In addition, the top lid 7 has a fitting projection 9 on its inner surface that protrudes radially inward in an annular shape along the inner peripheral edge of the top lid 7.

[0031] The cap body 4 has an annular top lid holding portion 10 along its outer circumferential edge, and the top lid holding portion 10 is shaped to expand radially outward from the cap body 4. The top lid holding portion 10 has a fitting surface 11 whose outer circumferential surface is recessed in an arc shape, and the fitting surface 11 fits into the fitting protrusion 9 of the top lid 7.

[0032] The cap body also has a main body portion 12 that surrounds the mouth portion 3 of the container 2 around the axis of the container 2, an inside plug 13 that covers the mouth portion 3, and a pouring tube 15 that surrounds the inside plug opening 14.

[0033] 1 to 3, the hinge cap 1 is shown in an unopened state, so the inside plug opening 14 is closed by the intended opening portion 16. The intended opening portion 16 is connected to the edge of the inside plug opening 14 via a weakened portion 17, and has a pull ring 18.

[0034] The inside plug 13 has a recessed structure in which the area surrounded by the pouring tube 15 fits into the mouth 3, and the inside plug opening 14 and the intended opening portion 16 are provided on the inside plug bottom surface 13a. Furthermore, the inside plug 13 has an inside plug inner seal portion 19 that is inserted into the mouth 3 of the container 2, and a fitting groove 20 into which the mouth 3 is inserted is formed between the inside plug inner seal portion 19 and the main body portion 12.

[0035] The top lid 7 has a top lid inner 21, which is annular around the axis of the top lid 7 and has an inner tip edge that abuts liquid-tightly against the inner surface of the top lid holding portion 10 to form a sealed area.

[0036] The main body 12 has a cap inner protrusion 22 that protrudes radially inward of the container 2 , and the cap inner protrusion 22 fits into a container outer recess 23 formed on the outer periphery of the mouth of the container 2 .

[0037] The easy-to-open structure 50 has a support portion 51, a hook holding portion 52, a pull-out portion 53, and a hook portion 54, and is structured so that the hook portion 54 engages with the hook holding portion 52 in the cap axial direction from the inner plug 13 toward the inner top surface of the top lid 7.

[0038] That is, the support portion 51 rises from near the outer circumferential edge of the intended opening portion 16 in the cap axial direction, and is located on the opposite side of the hinge 5 with respect to the cap axial center in the cap radial direction. Here, the hook holding portion 52 is composed of the pull ring 18 which is an annular body integrally provided at the tip of the support portion 51, but the hook holding portion 52 is not limited to being annular and may have another shape.

[0039] The pull-out portion 53 here consists of a cylindrical body hanging down from the inner top surface of the top lid 7 in the cap axial direction, and the hook portion 54 consists of a plurality, here a pair of flaps 55 and sub-flaps 56, which are integrally provided on the opening edge at the tip of the pull-out portion 53. The flaps 55 and sub-flaps 56 are inverted toward the inner top surface of the top lid 7, and the base portion continuing to the pull-out portion 53 and the tip edge on the inner side in the cap radial direction form an arc shape, forming a curved surface that curves around the axis of the pull-out portion 53.

[0040] Furthermore, the easy-open structure 50 has a flap restricting portion 57 in the intended opening portion 16. The flap restricting portion 57 has a shape that follows the opening edge of the intended opening portion 16 in a plan view, rises convexly from the inside plug bottom surface 13a in the cap axial direction, and fits inside the pull ring 18 to form a flap insertion gap 58 between the flap restricting portion 57 and the pull ring 18.

[0041] The pair of flaps 55 of the hook portion 54 engage with the pull ring 18 on both sides of the support portion 51, and the flap tips 59 enter the flap insertion gap 58. The sub-flap 56 is located opposite the support portion 51 via the cap axis in the cap radial direction, and engages with the pull ring 18, so that the sub-flap tip 60 enters the flap insertion gap 58.

[0042] In addition, in a cross section including the cap axis and the axis of the support portion 51, the easy-to-open structure portion 50 has a plane including the outer peripheral edge of the intended opening portion 16 and the weakened portion 17, i.e., the bottom surface 13a of the inner plug, inclined at an acute angle relative to the axis of the support portion 51, and forms an inclined surface with an upward slope from the opposite side of the hinge 5 toward the hinge side in the cap radial direction, in this case the inclination angle being 15°.

[0043] In addition, the easy-to-open structure 50 has a fracture starting point 61 at a portion where the weakened portion 17 faces the hinge 5 via the cap axis in the cap radial direction, and has a structure in which the outer peripheral edge on one side of the intended opening portion 16 and the outer peripheral edge on the other side, which are separated by the fracture starting point 61 of the weakened portion 17, form an acute angle.

[0044] The operation of the above configuration will now be described. (When cap is set) As shown in Figure 3, when the top lid 7 is folded, the mating protrusion 9 of the top lid 7 fits into the mating surface 11 of the top lid holding portion 10 of the cap body 4, and the inner tip edge of the top lid inner 21 and the inner surface of the pouring tube 15 abut liquid-tightly to form a sealed area.

[0045] Furthermore, when the top lid 7 is folded, the flap 55 and the sub-flap 56 come into contact with the upper end of the pull ring 18 and pass through the pull ring 18 while being pushed toward the inner surface of the pull-out portion 53. At this time, the top lid 7 is elastically deformed, and the flap 55 and the sub-flap 56 are pushed toward the inside plug bottom surface 13a until the flap tip 59 and the sub-flap tip 60 pass through the pull ring 18.

[0046] When the flap 55 and the sub-flap 56 pass through the pull ring 18, the flap tip 59 and the sub-flap tip 60 come into contact with the flap regulating portion 57, and as the top cover 7 is restored, the pair of flaps 55 of the hook portion 54 engage with the pull ring 18, the flap tip 59 enters the flap insertion gap 58, and the sub-flap 56 engages with the pull ring 18, and the sub-flap tip 60 enters the flap insertion gap 58. (When first opened) As shown in Figures 4 and 7, the top lid 7 is opened when the intended opening portion 16 is opened for the first time. At this time, the flange portion 8 for hooking the fingers is provided at a position continuing to the top surface of the top lid 7 on one side in the cap axial direction, so that it is easy to apply force for opening. Then, with the top lid 7 rotating around the hinge 5, the pair of flaps 55 of the hook portion 54 of the easy-to-open structure 50 engage with the pull ring 18 at both sides via the support portion 51, the sub-flap 56 engages with the pull ring 18 at a position facing the support portion 51 via the cap axial center in the cap radial direction, the flap tip 59 and the sub-flap tip 60 enter the flap insertion gap 58, and the engagement between the flap 55 and the sub-flap 56 and the pull ring 18 is reliably maintained.

[0047] Therefore, deformation and wobbling of the pull ring 18 can be prevented when the pull ring 18 is pulled up, and loss of the opening force due to deformation of the pull ring 18 can be suppressed, so that the input opening force acts effectively for opening.

[0048] As shown in Figure 5, as the operation of opening the top lid 7 progresses, the opening force applied to the top lid 7 is applied to the intended opening portion 16 via the easy-to-open structure 50, causing the weakened portion 17 to break, the intended opening portion 16 to detach from the inner plug 13, and the top lid 7 and the intended opening portion 16 to move together via the easy-to-open structure 50.

[0049] At that time, since the support portion 51 of the easy-to-open structure portion 50 is located near the outer peripheral edge of the intended opening portion 16 and on the opposite side of the hinge via the cap axis in the cap radial direction, the opening force applied by the rotational movement of the top cover 7 around the hinge acts in a concentrated manner on the weakened portion 17 on one side of the intended opening portion 16, and the starting point of fracture of the weakened portion 17 occurs with a relatively weak opening force.

[0050] In addition, at the fracture starting point 61 of the weakened portion 17, which is located at the portion facing the hinge 5 via the cap axis in the cap radial direction, the easy-to-open structure 50 has an acute angle between the outer peripheral edges on both sides of the intended opening portion 16, which is the boundary of the fracture starting point 61, so that the opening force acts in a concentrated manner on the fracture starting point 61 of the weakened portion 17, and the fracture starting point of the weakened portion 17 occurs with a relatively weak opening force.

[0051] Then, following the rotational movement of top lid 7 around the hinge, the breaking point of weakened portion 17 gradually moves toward hinge 5 along the outer peripheral edge of intended opening portion 16, which follows the same trajectory as the opening edge of inner plug opening 14, and weakened portion 17 breaks along the entire outer peripheral edge of intended opening portion 16, causing intended opening portion 16 to detach from inner plug 13, and the intended opening portion of the inner plug opening can be easily opened.

[0052] At this time, in a cross section including the cap axis and the axis of the support portion 51 , the easy-open structure 50 has a plane including the outer periphery of the intended opening portion 16 and the weakened portion 17 inclined at an acute angle relative to the axis of the support portion 51 .

[0053] As a result, the opening force acting on the weakened portion 17 via the support portion 51 and the intended opening portion 16 due to the rotational movement of the top cover 7 around the hinge acts concentratedly at the breaking point rather than being dispersed throughout the weakened portion 17, and the weakened portion 17 breaks with a relatively weak opening force.

[0054] As shown in FIG. 6, after opening the package and weakened portion 17 breaks, intended opening portion 16 and pull ring 18 remain inside pull-out portion 53 of top lid 7 and move integrally with top lid 7 to open and close, so no waste is generated when the package is opened.

[0055] Next, another embodiment of the present invention will be described with reference to FIGS. Example 2 11 to 19, components having the same functions as those described in the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0056] In the second embodiment, the easy-open structure 50 is composed of a pair of flaps 71 in which the hook portion 54 engages with the pull ring 18 at both sides via the support portion 51, and the flap 71 extends over a range exceeding half the circumference of the cap along the circumferential direction of the cap. Furthermore, the flap 71 has a shorter length extending in the radial direction of the cap than that of the first embodiment, and has a protruding portion 73 on the side facing the flap restricting portion 57 that bulges inward in the radial direction of the cap compared to the flap tip 72.

[0057] 11, the flap restricting portion 57 has a shape that follows the outer periphery of the intended opening portion 16 on the side facing the pair of flaps 71, and has a missing shape on the side facing the hinge 5. The pull ring 18 has a shape that is deformed linearly on the side facing the hinge 5, rather than being annular.

[0058] In addition, the easy-to-open structure 50 has a pull ring holding portion 74 on the inner top surface of the top lid 7, which faces the support portion 51 via the cap axis in the cap radial direction, and the pull ring holding portion 74 has a structure in which the engagement portion 75 at its tip holds the straight portion of the pull ring 18 toward the inner plug side.

[0059] Furthermore, the easy-open structure 50 has an initial opening region 76 on the side facing the hinge 5 across the cap axis in the cap radial direction. In the initial opening region 76, in a cross section including the cap axis and the axis of the support portion 51, a plane including the outer circumferential edge of the intended opening portion 16 and the weakened portion 17 is structured to be inclined at an acute angle to the axis of the support portion 51. In other words, the inside plug bottom surface 13a is inclined at an acute angle to the axis of the support portion 51, and forms an inclined surface with an upward gradient from the opposite side of the hinge 5 toward the hinge side in the cap radial direction, in this case an inclination angle of 45°.

[0060] The operation of the above configuration will now be described. (When cap is set) As shown in Figure 13, when the top lid 7 is folded, the mating protrusion 9 of the top lid 7 fits into the mating surface 11 of the top lid holding portion 10 of the cap body 4, and the inner tip edge of the top lid inner 21 and the inner surface of the pouring tube 15 abut liquid-tightly to form a sealed area.

[0061] Furthermore, when the top lid 7 is folded, the flap 71 hits the upper end of the pull ring 18 and passes through the pull ring 18 while being pushed toward the inner surface of the pull-out portion 53. At this time, the top lid 7 is elastically deformed, and the flap 71 is pushed toward the inside plug bottom surface 13a until the flap tip 72 passes through the pull ring 18.

[0062] When the flap 71 passes through the pull ring 18, the flap tip 72 comes into contact with the flap regulating portion 57, and as the top cover 7 is restored, the pair of flaps 71 of the hook portion 54 engage with the pull ring 18, and the flap tip 72 enters the flap insertion gap 58.

[0063] Furthermore, when the top cover 7 is folded, the ring pressing portion 74 presses the linear portion of the pull ring 18 toward the inside plug with the engagement portion 75 at the tip thereof. (When first opened) As shown in Figures 14 and 18, when the top lid 7 is opened for the first time to open the intended opening portion 16, as the top lid 7 rotates around the hinge 5, a pair of flaps 71 of the hook portion 54 of the easy-to-open structure 50 engage with the pull ring 18 on both sides via the support portion 51, and the flap tips 72 enter the flap insertion gap 58, so that the engagement between the flaps 71 and the pull ring 18 is securely maintained.

[0064] Since the flap 71 spreads over a range exceeding half the circumference of the cap along the circumferential direction of the cap, the length of engagement between the flap 71 and the pull ring 18 can be sufficiently ensured, and the flap 71 pulls up the pull ring 18 in a stable posture, suppressing loss of the opening force due to deformation of the pull ring 18, and the input opening force effectively acts for opening.

[0065] Furthermore, since the strength of the flap 71 is ensured by the raised portion 73, the flap tip 72 can be reliably maintained facing the inner top surface side of the top cover 7, and it is guaranteed that the flap tip 72 will enter the flap insertion gap 58.

[0066] Furthermore, the ring pressing portion 74, which faces the support portion 51 in the cap radial direction, presses the pull ring 18, thereby preventing the pull ring 18 from deforming or wobbling when the pull ring 18 is pulled up, and suppressing the loss of the opening force due to deformation of the pull ring 18, so that the input opening force acts effectively for opening.

[0067] As shown in Figure 15, as the operation of opening the top lid 7 progresses, the opening force applied to the top lid 7 is applied to the intended opening portion 16 via the easy-to-open structure 50, causing the weakened portion 17 to break, the intended opening portion 16 to detach from the inner plug 13, and the top lid 7 and the intended opening portion 16 to move together via the easy-to-open structure 50.

[0068] At this time, in the initial opening region 76 of the easy-open structure 50, the support portion 51 is located near the outer peripheral edge of the intended opening portion 16 and on the opposite side of the hinge via the cap axis in the cap radial direction, so that the opening force applied by the rotational movement of the top cover 7 around the hinge acts in a concentrated manner on the weakened portion 17 on one side of the intended opening portion 16, and the starting point of fracture of the weakened portion 17 occurs with a relatively weak opening force.

[0069] In addition, in the initial opening region 76 of the easy-open structure 50, at the fracture starting point 61 of the weakened portion 17 located at the portion facing the hinge 5 via the cap axis in the cap radial direction, an acute angle is formed between the outer peripheral edges on both sides of the intended opening portion 16, with the fracture starting point 61 as the boundary, so that the opening force acts biased and concentrated on the fracture starting point 61 of the weakened portion 17, and the fracture starting point of the weakened portion 17 occurs with a relatively weak opening force.

[0070] Then, following the rotational movement of top cover 7 around the hinge, the breaking point of weakened portion 17 gradually moves toward hinge 5 along the outer peripheral edge of intended opening portion 16 which follows the same trajectory as the opening edge of inside plug opening 14.

[0071] At this time, in the initial opening region 76 of the easy-open structure 50, in a cross section including the cap axis and the axis of the support portion 51, a plane including the outer edge of the intended opening portion 16 and the weakened portion 17 is inclined at an acute angle relative to the axis of the support portion 51.

[0072] As a result, the opening force acting on the weakened portion 17 via the support portion 51 and the intended opening portion 16 due to the rotational movement of the top cover 7 around the hinge is initially concentrated at the breaking point rather than being dispersed throughout the weakened portion 17 in the opening area 76, and the weakened portion 17 breaks with a relatively weak opening force.

[0073] Furthermore, as shown in FIG. 16 , in response to the rotational movement of top cover 7 around the hinge, the breaking point of weakened portion 17 gradually moves toward hinge 5 along the outer peripheral edge of intended opening portion 16, which follows the same trajectory as the opening edge of inside plug opening 14, and weakened portion 17 breaks along the entire outer peripheral edge of intended opening portion 16, causing intended opening portion 16 to detach from inside plug 13, and the intended opening portion of the inside plug opening can be easily opened.

[0074] As shown in FIG. 17, after opening due to the weakened portion 17 breaking, the intended opening portion 16 and the pull ring 18 remain inside the pull-out portion 53 of the top lid 7 and move integrally with the top lid 7 to open and close, so no waste is generated when the package is opened. [Explanation of symbols]

[0075] 1 Hinge Cap 2 containers 3 Mouth 4 Cap body 5 Hinge 6 Bands 7 Top lid 8. Flange 9 Fitting protrusion 10 Top lid holder 11 Mating surface 12 Main body 13 Inner stopper 13a Bottom of inner plug 14 Inner plug opening 15 Pour tube 16 Opening area 17 Weakened part 18 Pull Ring 19 Inner seal part of inner plug 20 Fitting groove 21 Top lid inner 22 Cap inner convex part 23 Container outer recess 50 Easy-open structure 51 Pillar section 52 Hook holder 53 Pull-out section 54 Hook part 55 Flap 56 Subflap 57 Flap regulation part 58 Flap insertion gap 59 Flap tip 60 Sub-flap tip 61 Starting point of fracture 71 Flap 72 Flap tip 73 Ridge 74 Pull ring presser 75 Related Department 76 First Opening Area

Claims

1. The cap has a cap body that is attached to the mouth of the container, a top lid that is integrated with the cap body via a hinge, and an easy-open structure, The cap body has an inner plug that closes the mouth opening, and an intended opening portion that seals the inner plug opening provided in the inner plug and is integrated with the inner plug via a weakened portion, The easy-open structure comprises a support portion which rises from near the outer peripheral edge of the intended opening portion in the direction of the cap axis and is located on the opposite side of the hinge via the cap axis in the cap radial direction, a hook holding portion provided at the tip of the support portion, a pull-out portion which hangs down from the inner top surface of the top lid in the direction of the cap axis, and a hook portion at the tip of the pull-out portion which inverts toward the inner top surface of the top lid, and the hook portion engages with the hook holding portion in the cap axial direction from the middle plug toward the inner top surface of the top lid.

2. The hinge cap according to claim 1, characterized in that the easy-to-open structure has a structure in which, in a cross section including the cap axis and the axis of the support portion, a plane including the outer edge of the intended opening portion and the weakened portion is inclined at an acute angle to the axis of the support portion.

3. The hinge cap described in claim 1, characterized in that the easy-open structure has a fracture starting point at a portion of the weakened portion that faces the hinge via the cap axis in the cap radial direction, and the outer peripheral edge of one side of the intended opening portion and the outer peripheral edge of the other side, which are separated by the fracture starting point of the weakened portion, form an acute angle.

4. The hinge cap described in claim 1, characterized in that the easy-open structure comprises a hook holding portion consisting of a pull ring integrally formed on the support portion, the hook portion consisting of a plurality of flaps integrally formed at the tip of the pull-out portion, a flap regulating portion provided in the intended opening portion inserts into the inside of the pull ring to form a flap insertion gap between it and the pull ring, a pair of flaps of the hook portion engage with the pull ring on both sides via the support portion, and the tips of the flaps insert into the flap insertion gap.

5. The hinge cap according to claim 4, characterized in that the easy-to-open structure has a sub-flap in which the hook portion faces the support portion via the cap axis in the cap radial direction, and the sub-flap engages with the pull ring and enters into the flap insertion gap.

6. The hinge cap according to claim 4, characterized in that the easy-open structure has a pull ring pressing portion on the inner top surface of the top cover that faces the support portion in the cap radial direction via the cap axis, and the pull ring pressing portion is structured to press the pull ring toward the inner plug.

7. The hinge cap according to claim 4, characterized in that the easy-open structure has a structure in which a pair of flaps of the hook portion that engage with the pull ring on both sides via the support portion extend over a range that exceeds half the circumference of the cap along the circumferential direction of the cap.

8. The hinge cap described in claim 1, characterized in that the easy-open structure has an initial opening region on the side facing the hinge via the cap axis in the cap radial direction, and in the initial opening region, in a cross section including the cap axis and the axis of the support portion, a plane including the outer edge of the intended opening portion and the weakened portion is inclined at an acute angle to the axis of the support portion.

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