Hinge cap

Abstract

To provide a hinge cap that, when a top cover is lifted at the time of opening, can improve operability at the time of opening by joining a transition plug and the top cover.SOLUTION: A hinge cap comprises a cap body A attached to a container body D, and a top cover B connected to the cap body A via a hinge C. The cap body A comprises: a partition wall 5 which seals a mouth 1 of the container body D; a pour-out cylinder 6 erected on the partition wall 5; a transition plug 10 which is defined on the partition wall 5 in the pour-out cylinder 6 by a breakable thin-walled weakened part 8; and an opening 12 formed in the transition plug 10. The top cover B comprises: a top wall 30; a sealing cylinder 32 which is suspended from an undersurface of the top wall 30, and seals the pour-out cylinder 6; and an engagement protrusion 35 which is suspended from the undersurface of the top wall 30 inside the sealing cylinder 32. The engagement protrusion 35 of the top cover B is fitted in the opening 12 of the transition plug 10 at the time of cover opening, and thereafter, is joined.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a hinge cap that is used by being attached to a container body, and particularly to a hinge cap having a transfer plug that breaks a thin-wall weakened portion at the first opening of the lid and moves to the upper lid side.

Background Art

[0002] Conventionally, in a hinge cap including a cap body attached to a container body and an upper lid connected to the cap body via a hinge, in order to ensure the sealing property of the container body, a breakable thin-wall weakened portion is defined as a planned opening portion of a pouring outlet in a partition wall of the cap body, and a removal portion provided with a pull ring or the like is formed. However, in order to open the removal portion, after opening the upper lid, it is necessary to pull up a pull ring or the like to cut off the removal portion, which is troublesome and causes problems for users with weak strength in opening.

[0003] Therefore, it is conceivable to eliminate the removal portion and open the pouring outlet in advance. However, in this case, since there is a problem with the sealing property of the container body, the pull ring is omitted, and a mountain-shaped transfer plug defined by a thin-wall weakened portion is provided as a planned opening portion of the pouring outlet in the inner partition wall of the pouring tube. After molding, the lid is closed, and the transfer plug of the cap body and the top wall of the upper lid are joined by ultrasonic welding or the like. A hinge cap that pulls up the transfer plug and breaks the thin-wall weakened portion to open it along with the opening of the upper lid has been conventionally known (see, for example, Patent Document 1).

[0004] In addition, in the hinge cap described in Patent Document 1, since it is necessary to close the lid after molding and join the upper surface of the transfer plug and the lower surface of the top wall by ultrasonic welding or the like, there is a possibility that the joining may not be sufficient depending on the area of the joining portion. For this reason, alternative solutions such as joining the upper lid and the transfer plug with a separate member or forming a through hole in the upper lid and inserting a convex portion formed on the transfer plug into the through hole for joining are also conceivable.

Prior Art Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-221643 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, the hinge cap described in Patent Document 1 has the problem that when opening, lifting the top lid pulls up the entire circumference of the transition plug defined in the opening area, requiring a large force to initiate the breakage of the thin-walled weakened portion, and also the problem that the strength of the joint portion, such as that formed by ultrasonic welding, is insufficient. Furthermore, even if the above alternative design were adopted, there was the problem of unsightly appearance due to the remaining traces of the through-holes on the top cover.

[0007] The present invention aims to solve the above problems and to provide a hinge cap that can improve operability when opening by firmly joining the transition plug and the top lid when the top lid is lifted during opening of the hinge cap. [Means for solving the problem]

[0008] To solve the above problems, the present invention provides a hinged cap comprising a cap body attached to the mouth of a container body and an upper lid connected to the cap body via a hinge, wherein the cap body comprises a partition wall that seals the mouth of the container body, a dispensing tube erected on the partition wall, and a transition plug defined by a ruptureable thin-walled weakened portion within the partition wall inside the dispensing tube, and the transition plug comprises a bottom wall connected to the partition wall via the thin-walled weakened portion, and a bottom wall The hinge and the opposite side The lid comprises an opening formed therein, and the top lid comprises a top wall, a sealing cylinder suspended from the lower surface of the top wall to seal the dispensing cylinder, and a locking projection on the inside of the sealing cylinder suspended from the lower surface of the top wall, the locking projection of the top lid is a transition plug when the lid is closed Bottom wall The system employs a configuration characterized by being fitted into an opening formed therein and then joined together.

[0009] As an embodiment of the hinge cap, the transition plug is characterized by having a gripping recess formed on the outer lower surface of the opening, the engaging projection is characterized by having a regulating rib on the upper outer circumference that abuts against the transition plug, the transition plug is characterized by having a guide wall formed on the outer upper surface of the opening, the transition plug is characterized by having a retaining vertical wall erected along the inside of the thinned and weakened portion from the hinge side, and the top cover is characterized by having a retaining receiving wall that is suspended from the lower surface of the top wall and engages with or abuts against the retaining vertical wall. [Effects of the Invention]

[0010] By adopting the above configuration, the hinge cap of the present invention can improve operability during opening by firmly joining the top lid and the transition stopper when the top lid is lifted during opening. Furthermore, the design ensures that the transition stopper on the hinge side is stably held after opening, thus preventing contamination of the inside and outside of the container by the liquid contents. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows the state before opening, with the hinge cap, which is the first embodiment of the present invention, attached to the container body, where (a) is a side cross-sectional view and (b) is a close-up of the main part of (a). [Figure 2] This figure shows the open state of a hinge cap immediately after manufacturing, which is the first embodiment of the present invention; (a) is a top view and (b) is a side cross-sectional view. [Figure 3] This is a bottom view showing the hinge cap, which is the first embodiment of the present invention, in the open state immediately after manufacturing. [Figure 4] This figure shows a hinge cap, which is a second embodiment of the present invention, in a closed state, where (a) is a side cross-sectional view and (b) is an enlarged view of the main part of (a). [Figure 5] This figure shows a hinge cap, which is a third embodiment of the present invention, in a closed state, where (a) is a side cross-sectional view and (b) is a close-up of the main part of (a). [Modes for carrying out the invention]

[0012] Next, the hinge cap of the present invention will be described with reference to the drawings shown in the following embodiments. In the following description, as shown in FIG. 1, the left direction is defined as the "front side (opposite side to the hinge)", the right direction is defined as the "back side (hinge side)", the upward direction is defined as "up", and the downward direction is defined as "down".

Embodiment

[0013] In FIG. 1, A is a cap body attached to the container body D, and B is an upper lid that connects and opens and closes the cap body A by a hinge C. An engaging ridge 2 is provided on the outer periphery of the mouth portion 1 of the container body D.

[0014] As shown in FIGS. 1 to 3, the cap body A includes a partition wall 5 that seals the mouth portion 1 of the container body D, a pouring cylinder 6 erected from the upper surface of the partition wall 5, and a mounting portion 7 that is attached to the mouth portion 1 and has a partition wall 5 formed inside.

[0015] The partition wall 5 is provided with a transfer plug 10 defined by a breakable thin-wall weakened portion 8 on the inner peripheral side of the pouring cylinder 6 to open the pouring port during use. The transfer plug 10 includes a bottom wall 11 connected to the partition wall 5 via the thin-wall weakened portion 8. A circular opening 12 is formed in the bottom wall 11 on the front side (opposite side to the hinge C), and a holding standing wall 13 is erected from the upper surface along the inner side of the thin-wall weakened portion 8 on the back side (hinge C side). Note that the opening 12 is not limited to a circular shape and can be set as appropriate.

[0016] In this embodiment, as shown in FIG. 2(a), the shape of the tip portion 11a of the bottom wall 11 on the front side is formed in a pointed shape so that the thin-wall weakened portion 8 can be easily broken. In addition, although the holding standing wall 13 is provided from the back side to near the opening 12, the holding standing wall 13 only needs to be provided at least around the rear end portion 11b of the bottom wall 11 so as to suppress deformation (such as floating) of the rear end portion 11b of the bottom wall 11.

[0017] As shown in FIG. 1(b), the opening 12 has an inner peripheral surface 14 that tapers in diameter from the upper end to the lower end in the shape of an inverted truncated cone. In the upper part of the opening 12, a cylindrical guide wall 15 with the inner peripheral surface 14 as its inner periphery stands upright from the upper surface of the bottom wall 11. On the lower outer side of the opening 12, a biting recess 16 formed from the lower surface of the bottom wall 11 is provided. In this embodiment, the guide wall 15 stands upright from the upper surface of the bottom wall 11 in the opening 12. However, as in the second embodiment described later, the guide wall 15 may be omitted.

[0018] The biting recess 16 is formed in an annular shape by digging down a diameter-expanded step portion 18 recessed from the lower surface of the bottom wall 11 at a predetermined depth, leaving the inner edge 18a of the step portion. Further, on the inner peripheral side of the biting recess 16, a plurality of engaging protrusions 17 are formed in the radial direction. As shown in FIG. 3, in this embodiment, eight engaging protrusions 17 are formed. However, the number of engaging protrusions 17 can be increased or decreased as needed. Furthermore, the bottom wall 11 has a peripheral wall 19 formed along the thin-wall weakened portion 8 on the outer peripheral side of the holding upright wall 13. The peripheral wall 19 forms a dike shape lower than the height of the holding upright wall 13.

[0019] The mounting portion 7 includes an inner cylinder 20 that hangs down from the outer peripheral edge of the partition wall 5 and whose outer periphery is inserted into the inner periphery of the mouth portion 1 of the container body D, an outer cylinder 21 whose inner periphery engages with the outer periphery of the mouth portion 1, and an annular lid engaging portion 22 that is connected at the upper end portions of the inner cylinder 20 and the outer cylinder 21. An outwardly protruding bulging portion 23 is provided on the upper part of the lid engaging portion 22. On the inner periphery of the outer cylinder 21, an engaging protrusion 24 that engages with the engaging ridge 2 provided on the outer periphery of the mouth portion 1 protrudes.

[0020] As shown in FIG. 2, in the vicinity of either the left or right side of the hinge C of the outer cylinder 21, an outer peripheral cut portion 25 that is substantially V-shaped in plan view is cut into the outer peripheral surface from above. A slit groove 26 is recessed from above so as to extend in a predetermined range in the circumferential direction on the back side starting from a position that separates the thin-wall portion at the upper part on the inner peripheral side of the outer peripheral cut portion 25. Therefore, when the container is disposed of, if the top lid B is pulled down via the hinge C, the outer peripheral cut portion 25 becomes a vertical tear line and the slit groove 26 becomes a circumferential tear line, causing the outer cylinder 21 to break circumferentially starting from the outer peripheral cut portion 25. The engagement between the engaging projection 24 of the broken portion and the opening 1 of the container body D is released, allowing the hinge cap to be easily detached from the container body D and disposed of separately.

[0021] As shown in Figures 1 to 3, the top cover B is rotatably attached to the upper outer circumference of the outer cylinder 21 of the cap body A via a hinge C, and comprises a flat top wall 30 and side circumferential walls 31 that hang down from the periphery of the top wall 30. The top wall 30 has a sealing cylinder 32 suspended from its lower surface, and a retaining wall 33 on the hinge C side inside the sealing cylinder 32. The sealing cylinder 32 is provided so that its outer circumference is in close contact with the inner circumference of the dispensing cylinder 6 of the cap body A, and the retaining wall 33 is provided so that its inner tip engages with or abuts against the upper outer end of the retaining vertical wall 13 of the transition plug 10. Although not shown in the diagram, it is sufficient if at least one of the retaining vertical wall 13 or the retaining receiving wall 33 is provided. If only the retaining vertical wall 13 is provided, it is desirable to form it up to the point where it abuts against or is close to the top wall 30. If only the retaining receiving wall 33 is provided, it is desirable to form it up to the point where it abuts against or is close to the transition plug 10.

[0022] In this embodiment, the inner circumference of the retaining wall 33 is engaged with or in contact with the outer circumference of the retaining vertical wall 13. However, the outer circumference of the retaining wall 33 may also be engaged with or in contact with the inner circumference of the retaining vertical wall 13, and the tip surface of the retaining wall 33 may be engaged with or in contact with the upper end surface of the retaining vertical wall 13. Furthermore, the retaining wall 33 is vertically installed in at least the area where the retaining vertical wall 13 is erected. Furthermore, the retaining wall 33 has a contact rib 34 formed in the center of the hinge C side of its inner circumference, and the contact rib 34 is provided so as to be close to or in contact with the upper end of the retaining vertical wall 13 when the inner circumference of the retaining wall 33 engages with or comes into contact with the outer circumference of the retaining vertical wall 13 of the transition plug 10.

[0023] Furthermore, the top wall 30 has a protruding part 35 that engages with the front side inside the sealed cylinder 32, extending downward from its lower surface. As shown in Figure 1, the engaging projection 35 consists of a base portion 36 formed in a cylindrical shape at the top and a welded portion 38 that gradually narrows in diameter downwards at the bottom. In this embodiment, the middle of the engaging projection 35 has an outer circumferential surface that slopes in an inverted truncated cone shape to match the inner circumferential surface 14 of the opening 12, forming a guide portion 37 that connects the base portion 36 and the welded portion 38. When the lid is closed, the engaging projection 35 is fitted into the opening 12 of the transition plug 10, the welded portion 38 extends beyond the lower end of the opening 12, the welded portion 38 is expanded by melting and welded to fill the engagement recess 16 and the enlarged diameter step 18 on the lower surface of the bottom wall 11, and the top lid B and the transition plug 10 are firmly joined together.

[0024] The shape of the engaging projection 35 is not limited as long as it can be fitted into the opening 12. For example, although the lower surface of the welded portion 38 in this embodiment is flat, the melting of the welded portion 38 can be facilitated by providing a recess on the lower surface of the welded portion 38. Furthermore, the engaging projection 35 is equipped with a regulating rib 39 that protrudes radially from the outer circumference of the base portion 36, and as shown in Figure 1(b), the lower end surface of the regulating rib 39 is positioned to contact or be close to the upper end surface of the guide wall 15 when the lid is closed.

[0025] An arc-shaped knob 40 is provided on the lower outer circumference of the front side of the side circumferential wall 31. As shown in Figure 2(b), the lower end of the side circumferential wall 31 has a locking projection 41 that engages with the inner circumference of the lid engaging portion 22 of the cap body A, and an engaging recess 42 is provided in the center that engages with the bulging portion 23 of the lid engaging portion 22 to maintain the closed lid state.

[0026] In this embodiment, to prevent unauthorized opening before use, a shrink label or sealing member is provided between the cap body A and the top lid B, although this is not shown in the diagram.

[0027] Next, the usage and effects of this embodiment will be described. The hinge cap in this embodiment is manufactured by integral molding using injection molding with a mold. The hinge cap, manufactured by integral molding, is obtained in the open state as shown in Figures 2 and 3, and the top lid B is rotated via the hinge C to be brought into the closed state as shown in Figure 1. In this case, the engaging projection 35 of the top cover B is reduced in diameter so that it becomes narrower at the bottom, allowing it to easily fit into the inner circumferential surface 14 of the opening 12, so that the welded portion 38 reaches below the lower end of the opening 12, and the outer circumference of the guide portion 37 fits within the inner circumferential surface 14. Furthermore, the lower end surface of the regulating rib 39 protruding from the hem portion 36 can contact or come into close proximity to the upper end surface of the guide wall 15, thereby preventing the engaging projection 35 from penetrating too far into the opening 12.

[0028] Furthermore, the upper outer end of the retaining vertical wall 13 engages with or abuts against the lower inner end of the retaining receiving wall 33, and the upper end of the retaining vertical wall 13 abuts against or is close to the lower end of the abutment rib 34. Furthermore, the sealing cylinder 32 is in close contact with the dispensing cylinder 6 to form a seal, and the lid engaging portion 22 of the cap body A and the locking projection 41 and engaging recess 42 of the upper lid B engage with each other to form the closed lid state shown in Figure 1.

[0029] In this embodiment, with the lid closed, the welded portion 38 is expanded by melting it from below the engaging protrusion 35 using a melting jig or the like. As shown in Figure 1(b), when the welded portion 38 of the engaging projection 35 is melted, it spreads outward from the inner edge 18a side of the enlarged step portion 18, and the welded portion 38 deforms into a deformed welded portion 38a, covering the engaging projection 17 along the gripping recess 16. At this time, the deformed welded portion 38a is welded to fill the gripping recess 16 and the enlarged diameter step portion 18 formed on the lower surface of the bottom wall 11. Therefore, when the top lid B is opened, the deformed welded portion 38a comes into close contact with the engaging projection 17 of the gripping recess 16, increasing the contact area, and thus the engaging projection 35 of the top lid B and the transition plug 10 of the cap body A are firmly joined. Next, the closed hinged cap is pressed onto the opening 1 of the container body D, which is filled with the liquid.

[0030] When using the hinged cap of this embodiment for the first time, the top lid B can be opened by breaking the thin, weakened portion 8 provided in the partition wall 5 of the cap body A. First, when the top lid B is lifted by placing fingers on the knob 40, the bottom wall 11 on the front side is lifted, causing the thin-walled weakened section 8 on the front side to begin to break. Further lifting of the top lid B causes the breaking of the thin-walled weakened section 8 to progress towards the hinge C, and finally the thin-walled weakened section 8 near the hinge C breaks. The transition stopper 10 is removed from the partition wall 5 and then moves to the top lid B for support, while the cap body A has a spout where the transition stopper 10 was removed from the partition wall 5, allowing the liquid contents inside the container body D to be poured out. Furthermore, in this embodiment, the tip 11a of the bottom wall 11 on the front side is pointed, which makes it easier for stress to concentrate on the thin-walled weakened portion 8 on the front side.

[0031] After using the contents, the top lid B is closed again onto the cap body A, forming a seal between the sealing tube 32 of the top lid B and the dispensing tube 6. At the same time, the lid engaging portion 22 of the cap body A and the locking projection 41 and engaging recess 42 of the top lid B engage, resealing the inside of the hinged cap, allowing the top lid B to be opened and closed repeatedly for use.

[0032] Furthermore, in this embodiment, the transition stopper 10 is designed so that the outer circumference of the retaining vertical wall 13 engages with or abuts against the inner circumference of the retaining receiving wall 33 of the top lid B, and the rear end 11b of the bottom wall 11 is firmly held in place. As a result, the spout is closed by the bottom wall 11, and even if the container body D is tipped over or shaken vigorously (for example, if the contents are a dressing), the rear end 11b of the bottom wall 11 is less likely to deform. This makes it difficult for the contents to enter through the gap between the bottom wall 11 and the partition wall 5. Even if the contents do enter through the gap between the bottom wall 11 and the partition wall 5, the retaining vertical wall 13 prevents the contents from flowing into the transition stopper 10. Therefore, even when the lid is opened again, contamination of the inside and outside of the container body D by the contents is suppressed.

[0033] Furthermore, in this embodiment, the retaining wall 33 of the top lid B has a contact rib 34 formed in the center of the hinge C side of its inner circumference. The contact rib 34 is provided so as to be close to or in contact with the upper end of the retaining vertical wall 13 when the inner circumference of the retaining wall 33 engages with or contacts the outer circumference of the retaining vertical wall 13 of the transition plug 10. Therefore, even if the top wall 30 of the top lid B is pushed in, it is possible to prevent the engagement or contact between the retaining vertical wall 13 and the retaining wall 33 from disengaging. In this embodiment, the contact rib 34 is provided in only one location on the retaining wall 33, but it may be provided in multiple locations. Furthermore, because the transition stopper 10 has a peripheral wall 19 along the outer circumference of the retaining vertical wall 13, even if the transition stopper 10 moves lower than before opening when the top lid B is closed after opening, it does not impair the closure of the spout.

[0034] In this embodiment, the hinge cap is attached to the container body D by pressing it in, but it may also be attached by screwing it in. Furthermore, although the thinned-wall weakened section 8 has the same thickness on the front side as on the hinge C side, it may be made thinner on the front side than on the hinge C side to make it easier to break. [Examples]

[0035] Next, a second embodiment will be described in which the cap body A and top lid B of the first embodiment are modified. In the following description, components identical to those in the first embodiment will be denoted by the same reference numerals, and only the different components will be denoted by different reference numerals, with the differences being the main focus of the explanation.

[0036] In Figure 4, Aa is the cap body that is attached to the container body, and Ba is the top lid that connects to the cap body Aa by hinge C and opens and closes. The cap body Aa consists of a partition wall 5 that seals the mouth of the container body, a dispensing tube 6 erected from the upper surface of the partition wall 5, and a mounting part 7 that is attached to the mouth and has the partition wall 5 formed on its inner side.

[0037] The partition wall 5 is provided with a transition plug 50 defined by a breakable, thin-walled weakened section 8 on the inner circumference side of the dispensing cylinder 6, in order to open the dispensing outlet when in use. The transition plug 50 has a bottom wall 51 connected to the partition wall 5 via a thin-walled weakened portion 8. The bottom wall 51 has a circular opening 52 on the front side, and a retaining vertical wall 13 is erected on the rear side from the upper surface along the inside of the thin-walled weakened portion 8.

[0038] As shown in Figure 4(b), the opening 52 has an inner circumferential surface 54 that is perpendicular from the upper end to the lower end, the upper part of the opening 52 is smoothly chamfered from the upper surface of the bottom wall 51, the lower part of the opening 52 has the inner edge 55 of the bottom wall 51 formed thereon, and the lower outer part of the opening 52 is provided with a gripping recess 56 formed from the lower surface of the bottom wall 51. The gripping recess 56 is formed in an annular shape by further excavating the inside of the enlarged diameter step 58, which is recessed to a predetermined depth from the lower surface of the bottom wall 51, leaving the inner edge 55 of the bottom wall intact. On the inner circumference of the gripping recess 56, multiple engaging projections 57 are formed in the radial direction, similar to the first embodiment.

[0039] The top cover Ba is rotatably attached to the upper outer end of the outer cylinder 21 of the cap body Aa via a hinge C, and comprises a flat top wall 30 and side circumferential walls 31 that hang down from the periphery of the top wall 30. The top wall 30 has a sealing cylinder 32 suspended from its lower surface, and an engaging projection 60 on the front side of the inside of the sealing cylinder 32.

[0040] As shown in Figure 4(b), the engaging projection 60 consists of a base portion 61 with a cylindrical upper section and a welded portion 62 with a gently tapering diameter towards the bottom. When the lid is closed, the engaging projection 60 is fitted into the opening 52 of the transition plug 50, the welded portion 62 extends beyond the lower end of the opening 52, the welded portion 62 is expanded by melting and welded to fill the engagement recess 56 and the enlarged diameter step 58 on the lower surface of the bottom wall 51, and the top lid Ba and the transition plug 50 are firmly joined together. Furthermore, the engaging projection 60 is equipped with a regulating rib 63 that protrudes radially from the outer circumference of the base portion 61, and the lower end surface of the regulating rib 63 is positioned to contact or be in close proximity to the upper surface of the bottom wall 51 when the lid is closed.

[0041] Next, the usage and effects of this embodiment will be described. The hinge cap of this embodiment, like that of the first embodiment, is obtained in an open state by injection molding, and the top lid Ba is rotated via the hinge C to be closed as shown in Figure 4(a). In this case, the engaging projection 60 of the upper lid Ba is reduced in diameter so that it becomes narrower at the bottom, allowing it to easily fit into the inner circumferential surface 54 of the opening 52. The welded portion 62 reaches below the lower end of the opening 52, and the lower end surface of the regulating rib 63 protruding from the hem portion 61 comes into contact with or is close to the upper surface of the bottom wall 51, thereby preventing the engaging projection 60 from going too far into the opening 52.

[0042] Next, in this embodiment, when the welded portion 62 is melted from below the engaging projection 60 using a melting jig or the like with the lid closed, the welded portion 62 is pushed open and spreads outward from the inner edge 55 side of the bottom wall, and is welded to fill the gripping recess 56 and the enlarged diameter step 58 formed on the lower surface of the bottom wall 51, and the transition plug 50 of the top lid Ba and the cap body Aa are firmly joined. Other uses and effects are the same as in the first embodiment. [Examples]

[0043] Next, a third embodiment will be described in which the cap body Aa of the second embodiment is modified. In the following description, components identical to those in the second embodiment will be denoted by the same reference numerals, and only the different components will be denoted by different reference numerals, with the differences being the main focus of the explanation.

[0044] In Figure 5, Ab is the cap body attached to the container body, and Ba is the top lid that connects the cap body Ab to the cap body Ab by a hinge C and opens and closes. The cap body Ab consists of a partition wall 5 that seals the mouth of the container body, a dispensing tube 6 erected from the upper surface of the partition wall 5, and a mounting part 7 that is attached to the mouth and has the partition wall 5 formed on its inner side.

[0045] The partition wall 5 is provided with a transition plug 70 defined by a breakable, thin-walled weakened section 8 on the inner circumference side of the dispensing cylinder 6, in order to open the dispensing outlet when in use. The transition plug 70 has a bottom wall 71 connected to the partition wall 5 via a thin-walled weakened portion 8. The bottom wall 71 has a circular opening 72 on the front side, and a retaining vertical wall 13 is erected on the rear side from the upper surface along the inside of the thin-walled weakened portion 8.

[0046] As shown in Figure 5(b), the opening 72 has a vertical inner circumferential surface 74 extending from the upper end to the lower end, the upper part of the opening 72 is smoothly chamfered from the upper surface of the bottom wall 71, and the lower part of the opening 72 has a cylindrical inner wall 75 extending downward from the lower surface of the bottom wall 71. A cylindrical outer cylinder wall 78 is vertically attached to the lower surface of the bottom wall 71 on the outer circumference side of the inner cylinder wall 75. A gripping recess 76 is provided between the outer cylinder wall 78 and the inner cylinder wall 75, formed to the same depth as the lower surface of the bottom wall 71. Multiple engagement protrusions 77 are formed radially on the inner circumference side of the gripping recess 76.

[0047] The top cover Ba is rotatably attached to the upper outer circumference of the outer cylinder 21 of the cap body Ab via a hinge C, and comprises a flat top wall 30 and side circumferential walls 31 that hang down from the periphery of the top wall 30. The top wall 30 has a sealing cylinder 32 suspended from its lower surface, and an engaging projection 60 on the front side of the inside of the sealing cylinder 32.

[0048] As shown in Figure 5(b), the engaging projection 60 consists of a base portion 61 formed in a cylindrical shape at the top and a welded portion 62 that is gently tapered downwards at the bottom. When the lid is closed, the engaging projection 60 is fitted into the opening 72 of the transition plug 70, and the welded portion 62 extends beyond the lower end of the opening 72. The welded portion 62 is expanded by melting and welded to fill the engagement recess 76 on the lower surface of the bottom wall 71 and the inner cylinder wall 75, thereby firmly joining the top lid Ba and the transition plug 70. Furthermore, the engaging projection 60 is equipped with a regulating rib 63 that protrudes radially from the outer circumference of the base portion 61, and the lower end surface of the regulating rib 63 is positioned to contact or be in close proximity to the upper surface of the bottom wall 71 when the lid is closed.

[0049] Next, the usage and effects of this embodiment will be described. The hinge cap of this embodiment, like that of the first embodiment, is obtained in an open state by injection molding, and the top lid Ba is rotated via the hinge C to be brought into the closed state shown in Figure 5(a). In this case, the engaging projection 60 of the upper lid Ba is reduced in diameter so that it becomes narrower at the bottom, allowing it to easily fit into the inner circumferential surface 74 of the opening 72. The welded portion 62 reaches below the lower end of the opening 72, and the lower end surface of the regulating rib 63 protruding from the hem portion 61 comes into contact with or is close to the upper surface of the bottom wall 71, thereby preventing the engaging projection 60 from going too far into the opening 72.

[0050] Next, in this embodiment, when the welded portion 62 is melted from below the engaging projection 60 using a melting jig or the like with the lid closed, the welded portion 62 is spread outwards from the inner cylinder wall 75 to the outer cylinder wall 78, and is welded to fill the inner cylinder wall 75 and the engagement recess 76 formed on the lower surface of the bottom wall 71, thereby firmly joining the upper lid Ba and the transition plug 70 of the cap body Ab. Other uses and effects are the same as in the first embodiment. [Industrial applicability]

[0051] The hinge cap of the present invention improves ease of opening by firmly joining the top lid and the transition stopper when the top lid is lifted during opening, and can therefore be widely applied as a hinge cap for containers that store liquid contents that require airtightness. [Explanation of Symbols]

[0052] A, Aa, Ab Cap body B, Ba top lid C Hinge D Container body 1 Mouth 2. Engaging protrusions 5 Bulkhead 6 Pour tube 7 Mounting part 8 Thin weakened part 10, 50, 70 transition plug 11, 51, 71 Bottom wall 11a Tip 11b Rear end 12, 52, 72 openings 13 Retaining standing wall 14, 54, 74 Inner surface 15 Guide Wall 16, 56, 76 Engagement recess 17, 57, 77 Engagement protrusion 18, 58 Expanded diameter step 18a Inner edge of stepped section 19 Peripheral wall 20 Inner cylinder 21 Outer cylinder 22 Lid engaging part 23 Bulge 24 Engagement protrusion 25 Outer circumference cut section 26 Slit grooves 30 Top Wall 31 Side wall 32 Closed Envelope 33 Retaining wall 34 Contact Rib 35, 60 Related protruding part 36, 61 Hem 37 Information Department 38, 62 Welded area 38a Deformed welded area 39, 63 Regulatory ribs 40 picks 41 Locking projection 42 Engagement recess 55 Inner edge of bottom wall 75 Inner cylinder wall 78 Outer cylinder wall

Claims

1. A hinged cap consisting of a cap body that is attached to the mouth of the container body and an upper lid that is connected to the cap body via a hinge, The cap body comprises a partition that seals the mouth of the container body, a dispensing tube erected on the partition, and a transition stopper defined by a ruptureable thin-walled weakened portion within the partition of the dispensing tube. The transition plug comprises a bottom wall connected to the partition wall via a thinned-wall weakened section, and an opening formed on the opposite side of the hinge of the bottom wall. The top lid comprises a top wall, a sealing cylinder suspended from the lower surface of the top wall to seal the dispensing cylinder, and a locking projection suspended from the lower surface of the top wall on the inside of the sealing cylinder. A hinge cap characterized in that the engaging projection of the top lid is fitted into an opening formed in the bottom wall of the transition plug when the lid is closed, and then joined together.

2. The hinge cap according to claim 1, characterized in that the transition plug has a gripping recess formed on the outer lower surface of the opening.

3. The hinge cap according to claim 1 or 2, characterized in that the engaging projection has a regulating rib on its upper outer circumference that contacts the transition plug.

4. The hinge cap according to any one of claims 1 to 3, characterized in that the transition plug is provided with a guide wall formed on the outer upper surface of the opening.

5. The transition plug is equipped with a retaining wall that is erected along the inside of the thinned and weakened section from the hinge side. The hinge cap according to any one of claims 1 to 4, characterized in that the top cover is provided with a retaining receiving wall that is suspended from the lower surface of the top wall and engages with or abuts against a retaining vertical wall.

Images