Hinge cap

Abstract

To provide a hinged cap adapted such that, when forming a hinged cap in one body by injection molding, no shrinkage takes place in a thin-walled portion of an upper lid distant from a gate.SOLUTION: A hinged cap comprises a cap body B to be fitted onto a container A and an upper lid D attached to the cap body B through a hinge C. The cap body B comprises a fit portion 3 to be fitted on a mouth 1 of the container A, an upper wall 4 extending inward from an inner edge of the fit portion 3 and closing an opening of the mouth 1, a spout 4a penetrating through the upper wall 4, and a spout cylinder 5 vertically extending from an upper surface of the upper wall 4 from the spout 4a. The upper lid D comprises a top wall 40, a seal cylinder 42 vertically extending from an underside of the top wall 40 so as to seal the spout cylinder 5, and a ring-formed portion 43 recessed with a thin-walled portion 52 on an outer peripheral side of the seal cylinder 42 from the underside of the top wall 40. The ring-formed portion 43 has a thickness-increased portion 53 only on a side closer to the hinge C.SELECTED DRAWING: Figure 1

Description

Technical Field

[0004] ,

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[0001] The present invention relates to a hinge cap attached to the mouth of a container, and particularly to a hinge cap with an upper lid Lightweight attached thereto.

Background Art

[0002] Conventionally, there is known a hinge cap including a cap body attached to a container body and an upper lid attached to the cap body via a hinge, wherein when the lid is closed, a sealing cylinder of the upper lid is inserted into and sealed with a pouring cylinder of the cap body. In a conventional hinge cap, the wall thicknesses of the top wall and the side peripheral wall of the upper lid are both 1.5 mm or more, and the fluidity of the synthetic resin during molding is the same for the top wall and the side peripheral wall, suppressing sink marks on the top wall. However, since the top wall of the upper lid is thick, weight reduction of the hinge cap has been desired.

[0003] For this reason, there is known a hinge cap in which the wall thickness of the top wall of the upper lid is made thinner than that of the side peripheral wall, and a recess is recessed from the lower surface on the outer peripheral side of the sealing cylinder of the top wall to form a thin wall portion (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the hinge cap described in Patent Document 1 above, when the cap body and the top lid are integrally molded via a hinge by injection molding, the gate is usually located on the cap body side. When synthetic resin is injected from the gate, the recess formed on the outer circumference of the sealing cylinder of the top lid becomes thinner than the rest of the top wall. As a result, the fluidity of the synthetic resin is reduced in the thin-walled portion, making it difficult for the synthetic resin that has started to flow from the gate to reach the vicinity of the sealing cylinder away from the hinge. This makes it easy for sink marks to occur on the upper surface of the top wall of the sealing cylinder, especially on the inner circumference of the thin-walled portion, and in some cases, holes may form in the top wall.

[0006] The present invention aims to solve the above problems and to provide a hinge cap that prevents sink marks from occurring in the thin-walled portion of the upper lid away from the gate when the hinge cap is integrally molded by injection molding. [Means for solving the problem]

[0007] To solve the above problems, the present invention provides a hinged cap comprising a cap body that is attached to a container and a top lid that is attached to the cap body via a hinge, wherein the cap body comprises a mounting portion that is attached to the mouth of the container, an upper wall that extends inward from the inner edge of the mounting portion and seals the opening of the mouth, a spout that penetrates the upper wall, and a dispensing tube that is erected on the upper surface of the upper wall from the spout, and the top lid comprises a top wall, Side walls suspended from the periphery of the top wall, It comprises a sealing cylinder that is suspended from the lower surface of the top wall and seals the dispensing cylinder, and a ring-shaped portion in which a thin-walled portion is recessed on the outer circumference of the sealing cylinder from the lower surface of the top wall, The thickness of the top wall of the lid is made thinner than that of the side walls, The ring-shaped part is only on the hinge side. A thin section is not recessed from the lower surface of the top wall. The system employs a configuration that features a fleshed-out section.

[0008] As an embodiment of the hinge cap, the added portion is characterized by being formed flush with the lower surface of the top wall, and the added portion is characterized by being formed so that a ring-shaped portion of a predetermined width crosses from the sealing cylinder in the direction of the hinge. [Effects of the Invention]

[0009] By adopting the above configuration, the hinge cap of the present invention makes it easier for the synthetic resin to reach the sealing cylinder away from the hinge via the added material, thereby suppressing the occurrence of sink marks and preventing holes from forming in the top wall. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows the open state of a hinge cap, which is an embodiment of the present invention; (a) is a top view and (b) is a side cross-sectional view. [Figure 2] Figure 1(a) is an enlarged view showing a side cross-section of the cap body shown, cut radially from the center O. (a) is an enlarged cross-section along line O-X1 (0° from the center of the hinge), (b) is an enlarged cross-section along line O-X2 (45° from the center of the hinge), (c) is an enlarged cross-section along line O-X3 (60° from the center of the hinge), and (d) is an enlarged cross-section along line O-X4 (95° from the center of the hinge). [Figure 3] Figure 1(b) is an enlarged cross-sectional view of the main part of the top lid of the hinge cap during mold molding. [Figure 4] This figure shows the closed state of a hinged cap, which is an embodiment of the present invention. (a) is a side cross-sectional view before the insertion rod portion is pushed up, and (b) is a side cross-sectional view after the insertion rod portion has been pushed up and the cap has been set in the container. [Figure 5] This is a top view showing the intermediate process of separating a hinge cap from a container fitted with a hinge cap, which is an embodiment of the present invention. [Modes for carrying out the invention]

[0011] Next, the hinge cap of the present invention will be described with reference to the drawings shown in the examples. In the following explanation, as seen in Figure 4, the left direction will be referred to as the "dispensing side," the right direction as the "back side," the upward direction as "up," and the downward direction as "down." [Examples]

[0012] In FIGS. 1 and 4, A is a container, B is a cap body attached to the container A, and D is an upper lid that is attached to the cap body B via a hinge C so as to be openable and closable. The container A has a mouth portion 1 at the upper part, and a fitting ridge 2 is provided on the upper part of the outer peripheral surface of the mouth portion 1. The upper part of the outer periphery of the fitting ridge 2 is an inclined surface 2a.

[0013] As shown in FIGS. 1 and 4, the cap body B includes a mounting portion 3 fitted to the mouth portion 1 of the container A, an upper wall 4 extending inward from the inner edge of the mounting portion 3 to block the opening of the mouth portion 1, a pouring outlet 4a penetrating the upper wall 4, a pouring cylinder 5 erected on the upper surface of the upper wall 4 with a slightly enlarged diameter from the pouring outlet 4a, a support cylinder portion E1 vertically provided from the pouring outlet 4a on the lower surface of the upper wall 4, and an insertion rod portion E3 extending in the vertical direction and connected via a breakable portion E2 at the lower end of the inner periphery of the support cylinder portion E1. In this embodiment, in order to facilitate pouring of the content liquid, the pouring side of the pouring cylinder 5 is formed higher than the back side (hinge C side), and the lip portion 5a spreads in a trumpet shape.

[0014] The mounting portion 3 is composed of a base wall portion 6 that abuts on the upper surface of the mouth portion 1 of the container A, an inner cylinder 7 vertically provided from the inner peripheral side of the base wall portion 6, and an outer peripheral wall portion 8 vertically provided from the outer peripheral side of the base wall portion 6. A hinge C is continuously provided at the upper end of the back side of the outer peripheral wall portion 8, and an engaging protrusion 9 that engages with the fitting ridge 2 of the mouth portion 1 of the container A is provided at the lower part of the inner periphery.

[0015] The base wall portion 6 is formed in an arc shape with a notch portion 10 cut at the same height as the upper surface of the upper wall 4 in a predetermined range from the center of the back side to the left and right, leaving a lid engaging portion 11 that engages with the upper lid D standing upright. In the notch portion 10, a plurality of back side protrusions 12 are provided at equal intervals with gaps opened from both ends of the lid engaging portion 11. A locking ridge 13 is provided on the outer periphery of the lid engaging portion 11.

[0016] On the upper part of the outer peripheral wall portion 8, on the pouring-out side, there is provided a stepped recess 15 recessed from the outer periphery at a depth of a distance α from above in an arc shape within an arc range of approximately 180°. On the remaining back side, the upper surface 8a is flush with the upper surface of the upper wall 4 and the bottom surface of the notch portion 10, and a hinge C is continuously provided at the upper end of the outer periphery. The stepped recess 15 is formed with a flat surface 15a that is lowered by a distance α from the upper surface 8a, an inclined surface 15b that inclines upward and inward from the inner peripheral edge of the flat surface 15a, and inclined side surfaces 15c that incline from both sides of the end of the flat surface 15a toward both sides of the upper surface 8a respectively.

[0017] As shown in FIG. 1(a), in the vicinity of the left side of the hinge C on the outer peripheral wall portion 8, an outer peripheral cut portion 16 that is substantially V-shaped in plan view is cut from the upper surface 8a while leaving a thin bottom wall at the lower end portion on the outer peripheral surface. At a position corresponding to the outer peripheral cut portion 16 of the engaging protrusion 9 on the inner periphery of the outer peripheral wall portion 8, although not shown, an inner peripheral cut portion is engraved in the vertical direction, and the outer peripheral wall portion 8 of this portion is cut from both the inside and the outside to form a vertical weakening portion 17 that constitutes a vertically torn line with a thin wall.

[0018] On the hinge C side from the outer peripheral cut portion 16 on the back side of the outer peripheral wall portion 8, a slit groove 18 is recessed from the upper surface 8a extending in the circumferential direction from a position separated from the thin portion at the upper part on the inner peripheral side of the end surface 16a to the inclined side surface 15c of the stepped recess 15 on the right end side of the upper surface 8a. Also, the upper surface 8a on the opposite side of the hinge C of the outer peripheral cut portion 16 of the outer peripheral wall portion 8 is a thick portion 19 where the upper part of the outer peripheral wall portion 8 and the lower part of the base wall portion 6 are integrally connected.

[0019] As shown in Figures 1 and 2(a), the bottom surface 20 of the slit groove 18 is formed so that the bottom surface 20a extends from the end surface 16a to the center of the hinge C (back side) (line O-X1 in Figure 1(a)), and is the deepest recess at a distance β from the top surface 8a. As shown in Figure 2(b), the bottom surface 20b extends approximately 45° to the right from the center of the hinge C (line O-X2 in Figure 1(a)), and further, as shown in Figure 2(c), the bottom surface 20c extends approximately 60° to the right from the center of the hinge C (line O-X3 in Figure 1(a)), with the height from the top surface 8a gradually decreasing from a distance β. Finally, as shown in Figure 2(d), the inclined side surface 15c of the stepped recess 15 at approximately 95° to the right from the center of the hinge C (line O-X4 in Figure 1(a)) is cut out and continues to the end of the flat surface 15a at a distance α.

[0020] As shown in Figure 1, the inner circumference of the bottom surface 20 forms a thin lower lateral weakening section 21 that connects the outer peripheral wall section 8 from the end face 16a side to the center of the hinge C with the lower wall section of the base wall section 6. An arc-shaped connecting section 22 is provided that slopes inward and upward from the inner peripheral edge of the bottom surface 20, which slopes upward, up to approximately 95° from the center of the hinge C. Furthermore, the portion of the outer peripheral wall portion 8 that is outside the slit groove 18 on the back side becomes a rear outer wall portion 23 that extends from the bottom surface 20 to the top surface 8a of the slit groove 18, and a hinge C is connected to a predetermined position at the upper end of the outer peripheral edge of the rear outer wall portion 23.

[0021] On the upper inner circumference of the outer peripheral wall portion 8, as shown in Figures 1 and 2(a), a contact surface portion 24 is formed from the left side to the center of the back side, inclined inward and upward from above the lower lateral weakening portion 21, and contacts the inclined surface 2a of the fitting projection 2 when attached to the container A. On the right side from the center of the back side, as shown in Figures 1 and 2(b), a parallel surface 25 is provided, inclined inward and upward parallel to the outer surface of the outer connecting portion 22, above the height of the inclined bottom surface 20, and formed to move away from the inclined surface 2a of the fitting projection 2 when attached to the container A. The space between the parallel surface 25 and the outer surface of the connecting portion 22 is thinned to form an inclined connecting weakening portion 26. On the dispensing side, as shown in Figures 1 and 2(d), an upward recess 27 is recessed from below on the outer peripheral edge of the lower surface of the base wall portion 6 within the range of the stepped recess 15, and the space between the upward recess 27 and the inclined surface 15b of the stepped recess 15 is thinned to form an upper lateral weakening portion 28. Furthermore, the lower lateral weakening section 21, the inclined connecting weakening section 26, and the upper lateral weakening section 28 are formed to be continuous in sequence, forming a circumferential tear line.

[0022] On the outer edge of the outer wall portion 8, on the dispensing side, a finger-grip recess 29 is provided, which is cut downward from the flat surface 15a of the stepped recess 15 within a predetermined range.

[0023] As shown in Figures 1 and 4, the support cylinder E1 consists of a cylindrical circumferential wall 30 that extends downward from the edge of the spout 4a on the lower surface of the upper wall 4, and an inwardly facing flange-shaped bottom wall 31 that is provided at the lower inner circumference of the cylindrical circumferential wall 30 and opens inward. Multiple side holes 32, which are liquid passage holes, are opened in the cylindrical circumferential wall 30, and a series of broken sections E2 are provided on the inner circumference of the flange-shaped bottom wall 31.

[0024] The insertion rod portion E3 is connected to the inner circumference of the flange-shaped bottom wall 31 of the support cylinder portion E1 via the broken portion E2 and is supported in a vertical position. It consists of a large-diameter insertion portion 35 extending downward, an insertion portion 36 that is reduced in diameter and extends above the insertion portion 35, and a locking recess 37 formed at the lower part of the insertion portion 35. Furthermore, the insertion rod portion E3 is fitted into the sealing cylinder 42 of the upper lid D, which will be described later, with the upper surface of the insertion portion 36 contacting the top wall 40 of the upper lid D, and the lower end of the insertion portion 35 being at the same height as the lower end of the sealing cylinder 42, or slightly below it (at least blocking the inside of the sealing cylinder 42).

[0025] As shown in Figures 1 and 4, the top lid D is rotatably attached to the upper outer edge of the outer peripheral wall portion 8 of the cap body B via a hinge C. It is provided with a top wall 40, a side peripheral wall 41 extending downward from the periphery of the top wall 40, and a sealing cylinder 42 extending downward from a predetermined location on the lower surface of the top wall 40 to seal the dispensing cylinder 5. The outer peripheral side of the sealing cylinder 42 of the top wall 40 is mostly recessed and hollowed out from the lower surface, and a deformable ring-shaped portion 43 is provided in that portion.

[0026] An engaging recess 45 is provided around the inner circumference of the lower end of the side circumferential wall 41 to engage with the lid engaging portion 11 and maintain the closed lid state. The engaging recess 45 has a locking portion 46 on its inward-facing surface that engages with the locking projection 13 of the lid engaging portion 11, and its downward-facing surface 45a is in contact with the upper surface of the lid engaging portion 11 and the upper surface of the rear side projection 12. Furthermore, multiple locking protrusions 47 are provided inside the engagement recess 45 of the side circumferential wall 41, except for the area near the central part of the dispensing side and the area that contacts the rear side projection 12 on the rear side. These protrusions contact the upper inner circumference of the lid engagement portion 11 when the lid is closed, preventing the side circumferential wall 41 from spreading outwards.

[0027] On the lower outer edge of the dispensing side of the side peripheral wall 41, an arc-shaped covering wall 48 is provided vertically so as to cover the stepped recess 15 of the outer peripheral wall portion 8 of the cap body B when the lid is closed, with its lower end approaching or in contact with the flat surface 15a of the stepped recess 15. On the outer circumference of the side periphery wall 41, an arc-shaped knob 49 is formed in the circumferential direction at the lower end on the dispensing side (including the outer circumference of the covering wall 48), and a hinge C is connected to the lower end on the back side.

[0028] The sealing cylinder 42 has a locking projection 50 on its lower inner circumference, into which the outer surface of the insertion portion 35 of the insertion rod portion E3 is inserted and slides, and which fits into and locks into the locking recess 37. Furthermore, as shown in Figure 4, a normal sealing portion a is formed on the outer circumference of the sealing cylinder 42, which is inserted into the inner surface of the dispensing cylinder 5 when the lid is closed to create a sealed state. In addition, the lower outer circumference of the sealing cylinder 42 is reduced in diameter to provide a lower sealing cylinder 42a, which is formed to be close to or in contact with the inner surface of the dispensing outlet 4a of the upper wall 4 when the lid is closed, and a temporary sealing portion b is formed between the lower sealing cylinder 42a and the inner surface of the dispensing outlet 4a.

[0029] The ring-shaped portion 43 consists of a thin-walled portion 52 recessed to a predetermined depth from the lower surface of the top wall 40, except on the hinge C side, and a thickened portion 53 formed flush with the lower surface of the top wall 40 only on the hinge C side of the ring-shaped portion 43. Note that the thickened portion 53 does not need to be strictly flush with the lower surface of the top wall 40; it may be raised above or recessed above the lower surface of the top wall 40. As shown in Figure 1(a), the added portion 53 is formed with a width γ (3 mm in this embodiment) and crosses the ring-shaped portion 43 from the sealing cylinder 42 in the direction of hinge C. The width γ of the added portion 53 is less than or equal to the outer diameter of the sealing cylinder 42, and is preferably between 2 mm and 7 mm.

[0030] In this embodiment, to prevent unauthorized opening before use, a shrink label, sealing member, or the like may be provided between the cap body B and the top lid D, although this is not shown in the illustration.

[0031] Next, the usage and effects of this embodiment will be described. In this embodiment, the hinge cap is integrally molded by setting the mold in the open position shown in Figure 1 and pouring synthetic resin through the gate (location G shown in Figure 1). In conventional integral molding, the last part of the synthetic resin to reach is the sealing cylinder 42 of the top lid D, which is furthest from the gate G. Furthermore, a thin-walled portion 52 is recessed to a predetermined depth from the lower surface of the top wall 40 on the outer circumference of the sealing cylinder 42. Because the thickness of the top wall 40 is reduced due to the thin-walled portion 52, the fluidity of the synthetic resin in that area is reduced. Therefore, sink marks were particularly likely to occur on the upper surface of the inner top wall 40 of the thin-walled portion 52, and in some cases, holes would form.

[0032] In this embodiment, a thickening portion 53 is provided on the hinge C side of the ring-shaped portion 43 with a width γ of 3 mm, so as to cross the ring-shaped portion 43 from the sealing cylinder 42 in the direction of hinge C. As shown in Figure 3, the synthetic resin can flow from the thickening portion 53 into the inside of the thin-walled portion 52 without impairing its fluidity, which suppresses the occurrence of sink marks on the upper surface of the top wall 40, and allows for clean molding without the formation of holes.

[0033] The molded hinge cap rotates the top lid D via the hinge C, placing it over the cap body B, and is closed as shown in Figure 4(a). At that time, the lower outer surface of the sealing cylinder 42 of the top lid D comes into close contact with the lower inner surface of the dispensing cylinder 5 of the cap body B, forming a seal portion a. Furthermore, the engaging recess 45 of the side peripheral wall 41 of the top lid D engages with the lid engaging portion 11 of the cap body B, maintaining the lid closed.

[0034] After closing the lid, the hinge cap of the present invention is fixed in a suitable manner so that the cap body B and the top lid D do not move, as shown in Figure 4(a), and the insertion rod portion E3 is pushed up using a jig (not shown). As a result, the break section E2 connecting the insertion rod section E3 to the support cylinder section E1 is broken, the insertion rod section E3 rises, the insertion section 36 of the insertion rod section E3 is guided into the sealing cylinder 42 of the top cover D, and then the insertion section 35 is fitted in while sliding against the locking projection 50 inside the sealing cylinder 42. Finally, as shown in Figure 4(b), the upper surface of the insertion portion 36 comes into contact with the top wall 40 inside the sealing cylinder 42, preventing the insertion rod portion E3 from being pushed up, and the locking recess 37 of the insertion portion 35 fits into the locking projection 50 of the sealing cylinder 42, locking it in place and sealing the inside of the sealing cylinder 42.

[0035] This prevents liquid from entering and accumulating inside the sealed cylinder 42 during use, and also leaves an opening on the inside of the flange-shaped bottom wall 31 as a mark where the insertion rod portion E3 has detached from the flange-shaped bottom wall 31 of the support cylinder portion E1. Furthermore, since the insertion rod portion E3 is inserted into and retained within the sealing cylinder 42, the sealing cylinder 42 is prevented from collapsing inward, improving the shape retention of the sealing cylinder 42 and maintaining a tight seal with the dispensing cylinder 5 when the lid is closed.

[0036] In this embodiment, when a leak test of the sealed seal is performed after closing the hinge cap, air is flowed from below the support cylinder portion E1 of the cap body B, and flows towards the spout 4a through the side holes 32 of the cylindrical peripheral wall 30 and the opening of the flange-shaped bottom wall 31 of the support cylinder portion E1. If there is a defect in the seal between the spout 5 of the cap body B and the sealing cylinder 42 of the top lid D, the air that leaks outward from the spout 5 will flow through the notch 10 of the base wall portion 6 of the cap body B, excluding the rear side projection 12 that abuts against the downward surface 45a of the engagement recess 45 of the top lid D, and the air will come out from between the inward surface of the engagement recess 45 and the outer surface of the rear side projection 12, making it easy to determine a seal defect.

[0037] Next, the closed hinged cap is pressed onto the opening 1 of container A, which is filled with the liquid, to secure it. In the capping process, the opening 1 of container A is placed against the annular groove formed between the inner cylinder 7 and the outer peripheral wall 8 of the mounting section 3, and pressing force is applied from above the top lid D, causing the engaging projection 9 of the outer peripheral wall 8 to overcome the fitting projection 2 of the opening 1 and engage, and the opening 1 of container A is clamped and mounted by the outer circumference of the inner cylinder 7, the inner circumference of the outer peripheral wall 8, and the base wall 6.

[0038] Furthermore, even if an impact force is applied to the top wall 40 of the top lid D when it is dropped upside down while the lid is closed, the ring-shaped portion 43 absorbs the impact received by the top lid D, preventing the sealing cylinder 42 from being pushed in or pulled away from the dispensing cylinder 5. This does not affect the tight seal between the sealing cylinder 42 and the dispensing cylinder 5 of the cap body B, preventing the sealing cylinder 42 and the dispensing cylinder 5 from coming undone or damaging each other.

[0039] When using the liquid contents of container A, insert your fingers into the finger-grip recess 29 on the dispensing side of the outer peripheral wall portion 8 of the cap body B, and lift the top lid D by hooking them onto the knob portion 49. This releases the seal between the sealing cylinder 42 of the top lid D and the dispensing cylinder 5 of the cap body B, and disengages the engagement between the side peripheral wall 41 of the top lid D and the base wall portion 6 of the cap body B. The top lid D is then opened, and when container A is tilted towards the dispensing side, the liquid contents of container A can flow through the side holes 32 of the cylindrical peripheral wall 30 and the opening of the flange-shaped bottom wall 31 of the support cylinder portion E1 of the cap body B, into the dispensing port 4a, and be dispensed from the dispensing cylinder 5.

[0040] In this embodiment, the hinged cap is provided with a covering wall 48 on the dispensing-side outer edge of the lower surface of the side peripheral wall 41 of the top lid D. This hides the stepped recess 15 of the outer peripheral wall portion 8 of the cap body B when the lid is closed, and prevents contact with the inside of the top lid D when the lid is opened, thus keeping the inside of the cap clean.

[0041] By closing the top lid D onto the cap body B again, the sealing cylinder 42 of the top lid D is in close contact with the inner circumference of the dispensing cylinder 5 of the cap body B, forming a seal and sealing the inside of container A. The hinged cap can be used by repeatedly opening and closing the top lid D.

[0042] In this embodiment, the hinge cap has a stepped recess 15 on the dispensing side of the outer peripheral wall portion 8 of the cap body B, which has a flat surface 15a and an inclined surface 15b. Therefore, even if the liquid contents drip from the lip portion 5a of the dispensing cylinder 5 into the lower stepped recess 15 when the container A is tilted during use, the inclination of the inclined surface 15b causes the liquid to flow onto the flat surface 15a. Furthermore, because the flat surface 15a is a smooth, even surface, dirt can be easily wiped off with a tissue or the like.

[0043] Next, we will describe how to dispose of the hinge cap separately after using up all the liquid inside container A. In this process, the hinge cap is opened, and the top cover D is grasped with the fingers and pulled outward. This pulls the rear outer wall portion 23, which is connected to the hinge C of the outer perimeter wall portion 8, via the hinge C, and pulls and deforms the rear side of the connected outer perimeter wall portion 8. The tension on the back side of the outer peripheral wall portion 8 causes the vertical weakened portion 17 formed by the outer peripheral cut portion 16 to break.

[0044] When the top cover D is pulled further, the lower horizontal weakening section 21 is cut circumferentially from the end face 16a side connected to the vertical weakening section 17, and then the continuous inclined connecting weakening section 26 begins to break. As the lower lateral weakening portion 21 is severed and the fracture of the inclined connecting weakening portion 26 progresses, as shown in Figure 5, the lower side of the fractured outer peripheral wall portion 8 is separated from the cap body B by the lower lateral weakening portion 21 and the inclined connecting weakening portion 26 of the upper lid D and the cap body B connected thereto.

[0045] Next, when the inclined connection weakening section 26 completely breaks, the continuous upper lateral weakening section 28 breaks from the right end, and finally passes through the stepped recess 15 and is stopped at the thickened section 19. Furthermore, when the broken outer periphery wall portion 8 is pulled, the thickened portion 19 of the connected outer periphery wall portion 8 is pulled outward, disengaging the engagement projection 9 of the outer periphery wall portion 8 of the cap body B from the fitting projection 2 of the mouth portion 1 of the container A. When lifted upward, the upper and inner sides of the outer periphery wall portion 8 connected by the thickened portion 19 are lifted, and the cap body B is removed from the mouth portion 1 of the container A, allowing the hinge cap and container A to be disposed of separately.

[0046] In this embodiment, when cutting the inclined connection weakening portion 26 of the hinge cap, the inclination is from bottom to top in line with the inclination of the bottom surface 20, so the force pulling on the lower part of the outer peripheral wall portion 8 is upward and easier to apply force to. Also, the parallel surface 25 on the inner circumference that forms the inclined connection weakening portion 26 moves away from the inclined surface 2a of the fitting projection 2 of the container A, so the resistance to cutting is reduced and it becomes easier to break. Furthermore, when cutting the upper lateral weakened portion 28 on the dispensing side, the upward recess 27 on the inner circumferential surface of the portion becomes completely separated from the inclined surface 2a of the fitting projection 2 of the container A, thus further reducing the resistance to cutting and making it easier to break. [Industrial applicability]

[0047] The hinge cap of the present invention is suitable as a hinge cap for containers that store food, etc., because, when integrally molding the cap body and the top lid via a hinge, even if a thin-walled recess is made from the bottom surface of the top wall of the top lid furthest from the gate provided on the cap body, the fluidity of the synthetic resin can be maintained and flowed through, shrinkage occurring on the upper surface of the top wall can be suppressed and the cap can be molded cleanly. [Explanation of symbols]

[0048] A container B Cap Body C Hinge D Top lid E1 Support cylinder part E2 Fracture E3 Insert rod part G Gate a. Seal part b Temporary seal section α, β distance γ width 1 Mouth 2. Interlocking protrusions 2a Slope 3. Mounting part 4 Upper wall 4a spout 5 Pour tube 5a Lip section 6 Base wall part 7 Inner cylinder 8 Outer wall 8a Top 9 Engagement protrusion 10 Notches 11 Lid engagement part 12 Rear protrusion 13 Locking protrusions 15 recessed steps 15a flat surface 15b Slope 15c sloped side 16 Outer circumference cut section 16a End face 17. Longitudinal weakening area (longitudinal tear line) 18 Slit grooves 19 Thick part 20, 20a, 20b, 20c bottom 21 Lower transverse weakened area (circumferential tear line) 22 Connecting part 23 Rear outer wall 24 Contact surface part 25 Parallel planes 26. Sloping connection weakening section (circumferential tear line) 27 Upward recess 28 Upper lateral weakened area (circumferential tear line) 29 Finger rest recess 30 Cylinder wall 31 Flange-shaped bottom wall 32 Side hole 35 Insertion part 36 Insertion part 37 Locking recess 40 Top Wall 41 Side wall 42 Closed Envelope 42a Lower sealing cylinder 43 Ring-shaped part 45 Engagement recess 45a Downward-facing surface 46 Locking part 47 Locking convex piece 48 Covered wall 49. Thumb part 50 Locking projection 52 Thin-walled section 53. Parts for adding flesh

Claims

1. A hinged cap comprising a cap body that is attached to a container and an upper lid that is attached to the cap body via a hinge, The cap body comprises a mounting portion that is attached to the mouth of the container, an upper wall that extends inward from the inner edge of the mounting portion and seals the opening of the mouth, a spout that penetrates the upper wall, and a dispensing cylinder that is erected on the upper surface of the upper wall from the spout. The top lid comprises a top wall, side walls extending downward from the periphery of the top wall, a sealing cylinder extending downward from the lower surface of the top wall to seal the dispensing cylinder, and a ring-shaped portion with a thin-walled recess formed on the outer circumference of the sealing cylinder from the lower surface of the top wall. A hinge cap characterized in that the thickness of the top wall of the top cover is thinner than that of the side walls, and the ring-shaped portion has a thickened portion only on the hinge side, where the thinned portion is not recessed from the lower surface of the top wall.

2. The hinge cap according to claim 1, characterized in that the added portion is formed flush with the lower surface of the top wall.

3. The hinge cap according to claim 1 or 2, characterized in that the added portion is formed to cross the ring-shaped portion from the sealing cylinder in the hinge direction with a predetermined width.

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