Tamper-proof lid

Abstract

To provide a tamper-proof lid that is easy to open with a simple configuration and that can ensure safety by reliably preventing the lid from being opened illegally.SOLUTION: The tamper-proof lid comprises a dish-shaped lid body 1 tightly fitted to the upper part of a container 21, and a picking piece 3 protruding from an upper edge 2 of the lid body 1. The picking piece 3 comprises a hinge part 4, a rising part 5, and an operating part 6 having a convex part 7 and a bulge part 8, and is integrally formed in a hinged connection with the upper edge 2 of the lid body 1 via the hinge part 4. On an inner bottom surface 9 of the lid body 1, a concave part 10 corresponding to the convex part 7 is formed, and when the picking piece 3 is folded back onto the inner bottom surface 9, the convex part 7 and the concave part 10 fit together, and in that state, the bulge part 8 is inverted by pressure on the bulge part 8, so that the tip of the picking piece 3 bends up.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tamper-proof lid, and more specifically, to a tamper-proof lid that is easy to handle and can reliably prevent tamper-opening. [Background technology]

[0002] For containers with lids for ice cream, yogurt, etc., measures are taken to prevent unauthorized opening, mainly from a hygienic standpoint. For example, Japanese Patent No. 5255662 discloses a packaging container that is detectable as having been opened and can be reclosed after opening. This container has a lid-side fitting rib (annular convex portion) on the lid and a body-side fitting rib (annular concave portion) on the container body, allowing the two to fit together. When the lid is opened, radial notches extending from the notches on both sides of the tab are formed in at least a part of the lid-side fitting rib, which leaves a trace of opening, making it possible to detect opening.

[0003] In the above configuration, since it is necessary to form a notch to leave a trace of opening of the lid body when the lid is opened, the configuration becomes complicated and the cost tends to increase accordingly. Also, since the upper edge of the lid is left free, it is easy to hook a finger there and open the lid illegally.

[0004] Also, Japanese Patent No. 6230185 discloses an inner fitting packaging container and its lid with a tamper-proof structure that has excellent sealing properties, can effectively prevent tampering, and is easy to manufacture and handle. In this invention, a separate lid is fitted into the container body, and the inner surface of the lid fitting wall of the lid is closely attached to the inner surface of the body fitting wall of the container body, and a guard wall part that rises upward to protect the outer edge of the lid flange part from the outside is formed around the entire circumference of the body flange part of the container body so that the lid flange part cannot be picked up. Also, an opening tab is extended from the lid flange part, and the opening tab is folded back inward at the top surface valley fold and fixed to a predetermined part of the lid body by a fixing means (tape) that cannot be re-fixed.

[0005] This structure is expected to be effective in preventing tampering, but the tape that is attached to the package must be peeled off to open it, which is not necessarily easy to do, and if the tape is not sufficiently adhesive for some reason, the tab may curl up, making it difficult to determine whether it has been removed tamper-proof. Furthermore, fixing the tab with tape that cannot be reattached requires time and money. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 5255662 [Patent Document 2] Patent No. 6230185 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned problems in the prior art, and its objective is to provide a tamper-proof lid that is simple in configuration, easy to open, and can reliably prevent unauthorized opening, ensuring safety. [Means for solving the problem]

[0008] The invention described in claim 1 for solving the above problem is a lid to be fitted onto a container, The lid comprises a dish-shaped lid body that is tightly fitted on the top of the container, and a gripping piece that protrudes from the upper edge of the lid body, The gripping piece is composed of a hinge portion, a rising portion, and an action portion having a convex portion and a bulging portion, and is integrally molded in a hinged state with the upper edge portion of the lid body via the hinge portion; A recess corresponding to the convex portion is formed on the inner bottom surface of the lid body, and when the gripping piece is folded back onto the inner bottom surface, the convex portion and the recess fit together.In this state, when the bulge portion is pressed, the bulge portion is inverted, thereby causing the tip of the gripping piece to bend up, thereby preventing unauthorized opening of the lid.

[0009] In one embodiment, a low peripheral wall is formed on the back surface of the gripping piece, and a shallow groove into which the peripheral wall fits is formed in a portion of the inner bottom surface of the lid body that corresponds to the peripheral wall. In one embodiment, the inner portion of the groove on the inner bottom surface where the recess is formed is formed lower than the other portion of the inner bottom surface, and in one embodiment, when the peripheral wall fits into the groove, the peripheral portion of the gripping piece is set to be the same as or lower than the inner bottom surface.

[0010] In one embodiment, when the lid body is fitted to the container, the upper edge of the lid body is prevented from protruding beyond a flange portion formed on the periphery of the container.

[0011] In one embodiment, a cut line is provided at the base of the protrusion, and as the gripping piece is pulled up, the protrusion is separated from the cut line and remains in the recess. Effect of the Invention

[0012] The tamper-opening prevention lid of the present invention is as described above and has a simple structure, and by pressing the bulge, the tip of the gripping piece can be curved up, making it easier to grip the gripping piece and opening the lid. Also, by checking the state of the bulge, it is possible to easily and reliably determine whether or not the lid has been tamper-opened. Furthermore, when the lid body is fitted to the container, the edge of its upper edge does not extend beyond the flange portion on the periphery of the container, so it is difficult for fingers to get caught on the edge of the upper edge of the lid body and tampering with the lid is difficult. This has the effect of more reliably preventing tamper opening and ensuring food safety. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view showing one embodiment of an unauthorized opening prevention cover according to the present invention. [Diagram 2] 2 is a perspective view showing the unauthorized opening prevention cover shown in FIG. 1 with the gripping piece removed. [Diagram 3] 2 is a vertical cross-sectional view showing the unauthorized opening prevention cover shown in FIG. 1 with the gripping piece removed. [Figure 4] 2 is a vertical cross-sectional view showing a state in which the tamper-proof cover shown in FIG. 1 is fitted onto a container. [Diagram 5] 2 is a vertical cross-sectional view showing the function of a bulge in the unauthorized opening prevention cover shown in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The embodiment of the present invention will be described in detail with reference to the attached drawings. The unauthorized opening prevention lid of the present invention is a lid that fits tightly onto a container 21, and is composed of a dish-shaped lid body 1 that is fitted onto the top of the container 21, and a gripping piece 3 that protrudes from an upper edge 2 of the lid body 1. The gripping piece 3 is composed of a hinge portion 4, a rising portion 5, and an operating portion 6, and is integrally molded in a hinged state with the upper edge 2 of the lid body 1 via the hinge portion 4.

[0015] The action portion 6 is formed with a protrusion 7 corresponding to a recess 10 formed on the inner bottom surface 9 of the lid body 1, and a bulge 8 is formed beyond the protrusion 7. The protrusion 7 faces downward when the gripping piece 3 is folded back onto the inner bottom surface 9 of the lid body 1 (as shown in FIG. 1 ) and fits into the recess 10.

[0016] The bulge 8 formed at the end of the action part 6 is a shallow dome-shaped reversing spring, which bulges upward when the gripping piece 3 is folded back onto the inner bottom surface 9 of the lid body 1 (as shown in FIG. 1). This bulge 8 is reversed by pressing it with a fingertip when the convex part 7 shown in FIG. 1 is fitted into the concave part 10. As the reversal occurs, a small white scratch-like pattern appears on the surface of the bulge 8 (so-called whitening phenomenon), and it is easy to determine whether the product has been handled improperly based on the presence or absence of traces of the scratch. In addition, as the bulge 8 is reversed, the tip of the action part 6 is warped up and rises above the inner bottom surface 9 (FIG. 5(A)), making it easier to hook the finger and grip the gripping piece 3.

[0017] In a preferred embodiment, a low peripheral wall 11 is formed on the periphery of the rear surface of the gripping piece 3 to provide rigidity, and a shallow groove 12 into which the peripheral wall 11 fits is formed on the inner bottom surface 9 of the lid body 1 at a portion corresponding to the peripheral wall 11. Also, a U-shaped portion 13 surrounded by the groove 12 on the inner bottom surface 9 is formed one step lower (by the thickness of the gripping piece 3) than the inner bottom surface 9 (see FIG. 3). Thus, when the gripping piece 3 is folded back onto the inner bottom surface 9 of the lid body 1 to fit the peripheral wall 11 into the groove 12, the upper surface of the action part 6 becomes flush with the inner bottom surface 9 (FIG. 4) or becomes lower than that, so that the end of the action part 6 is not caught by the fingertips.

[0018] The lid body 1 is fitted tightly into the enlarged diameter portion 22 at the top of the container 21 with the gripping piece 3 bent from the hinge portion 4 and folded back onto the inner bottom surface 9 and the convex portion 7 fitted into the concave portion 10, ensuring airtightness (FIG. 4). Preferably, the lid body 1 is formed in a downwardly bulging state, and the enlarged diameter portion 22 is formed in an upwardly narrowing state. In this case, the lid body 1 is fitted into the enlarged diameter portion 22 by being pressed into it, which increases the adhesion between the outer surface of the lid body 1 and the inner surface of the enlarged diameter portion 22, thereby further improving airtightness.

[0019] In addition, when the lid body 1 is fitted to the container 21, the edge 2a of the upper edge 2 is prevented from protruding beyond the flange portion 23a formed on the peripheral portion 23 of the container 21 (see FIG. 4). This makes it difficult for fingers to catch the edge 2a of the upper edge 2 of the lid body 1, thereby making it difficult to open the lid illegally. A sticker may be attached to the bulge 8.

[0020] When opening, pressing the bulging portion 8 with a fingertip causes the bulging portion 8 to invert and the tip of the action portion 6 to bend up and rise above the inner bottom surface 9 (Fig. 5(A)), and then by hooking a finger on the tip and lifting it further, it becomes easy to grasp the holding piece 3 (Fig. 5(B)). Then, by grasping the tip and pulling it up to pull the convex portion 7 out of the concave portion 10, and further holding the container 21 and pulling up the holding piece 3, the lid main body 1 can be easily removed from the container 21.

[0021] In this way, in order to remove the lid body 1 from the container 21, it is necessary to press the bulge portion 8 with a fingertip to invert the bulge portion 8, and since the bulge portion 8 undergoes a whitening phenomenon when inverted, it is possible to easily and reliably determine whether the lid has been tampered with or not based on the presence or absence of such traces.

[0022] Although the most preferred embodiment of the tamper-proof cover according to the present invention has been described, the present invention is not limited to the above embodiment. For example, in another embodiment, a cut line can be provided at the base of the protrusion 7, and the protrusion 7 can be separated from the cut line as the gripping piece 3 is pulled up, and can remain in the recess 10. [Industrial Applicability]

[0023] The tamper-proof lid of the present invention is as described above and has a simple structure, and by pressing the bulge, the tip of the gripping piece can be warped upward, making it easier to grip the gripping piece and opening the lid. In addition, by looking at the state of the bulge, it is possible to easily and reliably check whether the lid has been tamper-opened or not. Furthermore, when the lid body is fitted to the container, the edge of the upper edge does not extend beyond the flange portion on the periphery of the container, so it is difficult for fingers to get caught on the edge of the upper edge of the lid body and tampering with the lid is difficult. This has the effect of more reliably preventing tamper opening and ensuring food safety, and has great industrial applicability. [Explanation of symbols]

[0024] 1 Lid body 2 Upper edge 3 holding piece 4 Hinge part 5 Rising section 6 Acting part 7 Convex 8 Bulge 9 Inner bottom surface 10 Recess 11 Surrounding wall 12 grooves 13 U-shaped part 21 Condition 22 Expanded diameter part 23 Periphery

Claims

1. A lid that fits onto a container, The lid comprises a dish-shaped lid body that is tightly fitted on the top of the container, and a gripping piece that protrudes from the upper edge of the lid body, The gripping piece is composed of a hinge portion, a rising portion, and an action portion having a convex portion and a bulging portion, and is integrally molded in a hinged state with the upper edge portion of the lid body via the hinge portion; A recess corresponding to the convex portion is formed on the inner bottom surface of the lid body, and when the gripping piece is folded back onto the inner bottom surface, the convex portion and the recess fit together, and when the bulge is pressed in this state, the bulge is inverted, thereby causing the tip of the gripping piece to bend upward.This is an unauthorized opening prevention lid.

2. 2. The tamper-proof lid according to claim 1, wherein a low peripheral wall is formed on the rear surface of the gripping piece, and a shallow groove into which the peripheral wall fits is formed in a portion of the inner bottom surface of the lid body corresponding to the peripheral wall.

3. The tamper-evident lid according to claim 2 , wherein an inner portion of the groove of the inner bottom surface in which the recess is formed is formed lower than other portions of the inner bottom surface.

4. 3. The tamper-proof lid according to claim 2, wherein the peripheral edge of the gripping piece is flush with or lower than the inner bottom surface when the peripheral wall is fitted in the groove.

5. The tamper-proof lid according to claim 1 , wherein when the lid body is fitted to the container, an upper edge of the lid body is prevented from extending beyond a flange portion formed on the peripheral edge of the container.

6. 2. The tamper-proof lid according to claim 1, wherein a cut line is provided at the base of the protrusion, and the protrusion is separated from the cut line and remains in the recess as the gripping piece is pulled up.

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