Tamper-proof hinge cap

Abstract

To provide a tamper-proof hinge cap that blocks a space for your finger with a tamper band when unopened.SOLUTION: The present invention provides a tamper-proof hinge cap 1, including: a hinge cap having a spout 2 and a tamper band portion 1f, the hinge cap including: an upper lid portion 1a having a flange portion 1d connected to a main body portion 1b via a hinge portion 1c, and the tamper band portion 1f connected via a thin portion, in which the tamper band portion 1f is provided with a projecting portion 1g, when the tamper band portion 1f is fitted so as to engage with a locking portion 1h, the tamper band portion 1f on a lower end side of the flange portion 1d protrudes outward most, projecting further outward than a projection of the projecting portion 1g, and since the tamper band portion 1f is sandwiched between the flange portion 1d and the locking portion 1h, a space for placing fingers is blocked when a package is unopened.SELECTED DRAWING: Figure 16

Description

Technical Field

[0001] The present invention relates to a hinge cap with anti-counterfeiting function for covering a spout having a pouring outlet heat-sealed to an opening of a pouch container processed with a packaging material such as an aluminum sheet or a film sheet.

Background Art

[0002] In recent years, due to advantages such as being lightweight, shrinkable, not bulky as a container, having low air exposure of the contents, and high preservability, soft packages processed from base materials such as aluminum sheets and film sheets, so-called pouch containers, are filled with retort foods, beverages, jellies, seasonings, and products filled with contents such as refill detergents and shampoos, and many of them are displayed in stores. For pouch containers, in order to facilitate pouring of the contents, there are some in which a spout molded from plastic as described in Patent Document 1 is heat-sealed to an opening portion of a pouch container having a bag body.

[0003] For such spouts, threads are formed on the outer peripheral side wall surface of the spout so as to be screwed with a cap. In addition, some of the threads of the spout are formed with drain slits. As the function of the drain slits, as described in Patent Document 2, after filling the pouch with the contents and closing the opening with a cap, it may be put into a retort (a pressure sterilization kettle) and subjected to heat sterilization such as simmering. By performing retort, the water that has entered between the spout and the cap flows downward from the drain slits.

[0004] Normally, the spout can be sealed by screwing with a cap. However, the packaged body with a hinge cap described in Patent Document 3 is provided with a ridge on the inner side surface of the main body portion of the hinge cap for engaging with an annular protrusion formed on the outer peripheral surface of the extraction port portion (spout). It is devised that the main body portion can be plugged into the extraction port portion by the ridge overcoming the annular protrusion. In addition, the packaging bag with a hinge cap described in Patent Document 3 is devised as a barrier-free product that can be quickly and easily opened by simply pinching and cutting off a tamper band.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the packaging bag with a hinge cap described in Patent Document 3, it is a hinge cap provided with a tamper band to prevent unauthorized opening. However, since there is a gap for hooking a finger between the flange and the tamper band, when trying to hook the flange onto the finger forcefully in the unopened state and open it upward (the opening direction), the protrusion that was fitted into the locking portion is pulled upward and comes off from the locking portion, causing a problem. Also, the hinge cap of Patent Document 3 forms a gap between the tamper band and the main body portion to make it easier to grip with a finger when starting to tear off the tamper band. However, when the cap of the hinge cap of Patent Document 3 is set in the closed state and then unpacked and transported in a packing box, other tamper bands may enter the gap between the tamper band and the main body portion due to vibrations during transportation, etc., and the tamper bands may be torn off from each other, causing a problem.

[0007] An object of the present invention is to solve the above problems and provide an anti-tampering hinge cap in which the upper lid portion is set to the main body portion via a hinge portion and when it is unpacked and transported in a packing box, the tamper bands are not likely to catch on each other. Further, in an unopened state where the anti-tampering hinge cap of the present invention is plugged into a pouch container with a spout, in order not to be able to forcibly open the upper lid portion without tearing the tamper band portion, in order to eliminate the finger-touching space when unopened, it is to provide an anti-tampering hinge cap that closes the finger-touching space with the tamper band portion.

Means for Solving the Problems

[0008] The invention according to claim 1 can be fixed by heat welding to the opening of a pouch container made of a flexible film capable of accommodating contents, and has a spout for discharging the contents, and a hinge cap having a tamper band portion fixed to the spout and removed at the time of opening to prevent unauthorized opening. The spout forms a cylindrical main body, and a screw for screwing and an annular protrusion are formed on the outer peripheral side wall surface of the cylindrical shape. A drain slit is provided in the screw. The hinge cap includes a main body portion fixed to the spout of the spout, an upper lid portion having a flange portion connected to the main body portion via a hinge portion, and the tamper band portion connected to the lower end side of the side wall of the upper lid portion via a plurality of thin portions. At least one or more protruding first ribs are provided inside the side wall of the main body portion of the hinge cap so as to fit into the drain slit. and form at least one or more recessed second drain slits adjacent to the first rib, and a plurality of second ribs for engaging with the protrusion are formed along the circumference on the inner peripheral wall of the lower end of the main body portion. By covering the spout's pouring outlet with the hinge cap and plugging it, the first rib can be fitted into the drain slit, and the second rib can ride over and fit into the protrusion. The tamper band portion is provided with a protruding portion extending toward the bag body side, and the lower end of the flange portion and the upper end of the tamper band portion are connected by the thin portion. and The lower end of the tamper band portion and the upper end of the protrusion are connected by a second thin-walled portion. When the protrusion is fitted and engaged with a locking portion provided on the main body portion, the tamper band portion on the lower end side of the flange portion forms the same protruding width as the flange portion. By removing the tamper band portion during opening, a finger insertion space appears between the flange portion and the locking portion, which is a hinge cap with anti-tampering function.

[0009] In the invention according to claim 2, the inner peripheral wall of the tamper band portion is formed inside the outer peripheral wall of the upper lid portion, so that the tamper band portion is in close contact with the outer peripheral wall of the main body portion. One end of the tamper band portion is formed near the lower end of the flange portion, and the end opposite to the said end has a knob portion. On the back surface of the knob portion, irregularities for increasing frictional force are formed. By starting to peel off from the knob portion, the thin-walled portion and the second thin-walled portion are cut, and the tamper band portion is removed, which is a hinge cap with anti-tampering function.

[0010] In the invention according to claim 3, at least one or more recessed second drain slits adjacent to the first rib are formed. On the inner peripheral wall of the lower end of the main body portion, a plurality of second ribs for engaging with the protrusion are formed along the circumference. By covering the hinge cap on the spout's pouring outlet and plugging it, the first rib can be fitted into the drain slit, and the second rib can be fitted over the protrusion, which is a hinge cap with anti-tampering function.

[0011] In the invention according to claim 4, a top plate portion that slopes downward and outward from the center position of the top surface of the main body portion is formed. At the outer peripheral edge of the top plate portion, a stepped portion that drops lower than the top plate portion is provided. The stepped portion slopes downward from the inside to the outside, and a plurality of recessed third drain slits serving as passages are formed in a part of the stepped portion, which is a hinge cap with anti-tampering function.

[0012] The invention according to claim 5 is an anti-tampering hinge cap in which a plurality of third ribs are formed at equal intervals on the circumference of the inner peripheral wall at the upper inner end of the main body portion.

[0013] The invention according to claim 6 is an anti-tampering hinge cap in which a concave portion is formed on one side and a convex portion is formed on the other side of the locking portion on the surface in contact with the protruding portion and the protruding portion on the surface in contact with the locking portion, so that they are fitted to each other.

Effects of the Invention

[0014] To provide an anti-tampering hinge cap in which the upper lid portion of the anti-tampering hinge cap of the present invention is in a shape where tamper bands are not easily caught when it is unpacked and transported in a packing box with the upper lid portion set to the main body portion via the hinge portion. Also, in order to prevent the upper lid portion from being forcibly opened without tearing the tamper band portion when the anti-tampering hinge cap of the present invention is sealed to a spouted pouch container in an unopened state, to provide an anti-tampering hinge cap in which the tamper band portion closes the finger-access space to eliminate the finger-access space when unopened.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

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Figure 8

Figure 9

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Figure 11

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Figure 14

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Figure 16

Figure 17

Mode for Carrying Out the Invention

[0016] As shown in FIG. 14, the anti-tampering hinge cap 1 of the present invention is a hinge cap that can be plugged and attached to a spout 2 made of a plastic resin heat-sealed and attached to the opening of a pouch container 3 made of a flexible film such as nylon and polyethylene that can contain contents such as liquids and paste-like foods. The hinge cap is an anti-tampering hinge cap 1 having a tamper band portion 1f for preventing unauthorized opening that is removed when opened. The anti-tampering hinge cap 1 of the present invention is formed by an injection molding method using a plastic resin such as polyethylene or polypropylene.

[0017] As shown in FIG. 6, the spout 2 has a cylindrical main body 2b having a spout 2a for discharging the content having rigidity such as polyethylene, and a rhombus-shaped welded portion 2f formed on the lower end side of the main body 2b and penetrating the spout 2a is heat-welded and fixed to the opening portion of the pouch container 3 in a bag shape. Further, on the outer periphery of the main body 2b, there is a screwing thread 2c, and when the hinge cap 1 with anti-tampering is plugged and set on the spout 2, a protrusion 2d for fitting so that the hinge cap 1 with anti-tampering does not come off from the spout 2 protrudes outward from the peripheral wall of the main body 2b. Further, the spout 2 forms an annular protrusion 2d on the lower end side of the thread 2c, and a plurality of water drainage slits 2e for guiding the entered water downward are provided at a plurality of locations so as to be continuous from top to bottom on the thread 2c.

[0018] As shown in FIGS. 1 to 5, the hinge cap 1 with anti-tampering includes a cylindrical main body portion 1b that can be plugged and attached to the spout 2, a bottomed cylindrical upper lid portion 1a connected to the main body portion 1b via a hinge portion 1c, and a tamper band portion 1f for preventing unauthorized opening fixed via thin-walled portions 1e formed on at least two or more of the lower end sides of the side walls of the upper lid portion 1a. Further, a eaves-shaped flange portion 1d is formed near the lower end of the side wall of the upper lid portion 1a on the side opposite to the hinge portion 1c, and when the upper lid portion 1a is opened, a finger can be easily hooked on the flange portion 1d. Further, as shown in FIGS. 8 and 14, the lower end of the flange portion 1d and the upper end of the tamper band portion 1f are connected by the thin-walled portion 1e. Further, on the tamper band portion 1f at the position of the lower end of the flange portion 1d, a protrusion 1g is provided at a position extending in the direction toward the pouch container 3 side and sandwiching the tamper band portion 1 between the flange portion 1d. The protrusion 1g can be fitted and fixed so as to be inserted into and engaged with a locking portion 1h provided on the main body portion 1b.

[0019] The fitting state of the protrusion 1g and the locking portion 1h is shown in Fig. 8. By inserting the convex portion 1t formed on the locking portion 1h into the concave portion 1s formed on the protrusion 1g, the convex portion 1t and the concave portion 1s can be fitted and fixed. Further, a second thin portion 1m with a thin wall is formed between the lower end of the tamper band portion 1f and the upper end of the protrusion 1g. This is provided to make it easier to remove the tamper band portion 1f.

[0020] Furthermore, as shown in Figs. 1 and 4, at the end 1k of the tamper band portion 1f, a knob portion 1l for pinching with a finger is provided to start tearing off the tamper band portion 1f. The knob portion 1l and the upper lid portion 1a are connected by a thin portion 1e. However, the shape of the thin portion 1e connected to the knob portion 1l is formed to be wider than the thin portion 1e connected to the upper lid portion 1a when the width of the thin portion 1e connected to the upper lid portion 1a is made narrower. That is, the thin portion 1e connected to the knob portion 1l has a trapezoidal shape. Thereby, after removing the tamper band portion 1f, the remaining of the thin portion 1e remains on the knob portion 1l side and is less likely to remain on the upper lid portion 1a side. Also, when pinching the knob portion 1l with a finger and initially peeling it off, the user can feel the virginity of a sharp tearing. Further, when the upper lid portion 1a is sealed to the main body portion 1b and is in an unopened state, a plurality of fine convex vertical ribs are formed in the vertical direction on the back surface of the knob portion 1l so that a part of the outer peripheral wall surface of the main body portion 1b and the inner peripheral wall surface of the knob portion 1l do not adhere too closely.

[0021] Figure 7 is a plan view of the anti-tampering hinge cap 1 of the present invention as viewed from above. Also, Figure 8 is a cross-sectional view of Figure 7 cut along the A-A direction. As shown in Figures 7 and 8, when the protrusion 1g is fitted and engaged with the locking portion 1h provided on the main body portion 1b, the tamper band portion 1f on the lower end side of the flange portion 1d has the same protruding width as the flange portion 1d, so that the protrusion of the tamper band portion 1f becomes an obstacle and it is impossible to hook a finger on the flange portion 1d when unopened. That is, when unopened, as shown in Figure 8, the tamper band portion 1f is sandwiched between the flange portion 1d and the locking portion 1h, so that the tamper band portion 1f closes the finger access space 1i. However, when the tamper band portion 1f is removed to open the package, as shown in Figure 10, the finger access space 1i will appear.

[0022] Figure 9 is a cross-sectional view of Figure 7 cut along the B-B direction, and Figure 15 is an enlarged view of the z portion of Figure 14. As shown in Figures 9, 14, and 15, the inner peripheral wall 1fa of the tamper band portion 1f is formed inside the outer peripheral wall 1ba of the upper lid portion 1a, so that the tamper band portion 1f can be sealed in a state of being more closely attached to the outer peripheral wall of the main body portion 1b as shown in Figure 7. Thereby, even when the anti-tampering hinge cap 1 of the present invention is unpacked and transported in a packing box, it is possible to prevent the tamper band portions 1f from catching on each other, and it is possible to eliminate the peeling failure of the tamper band portion 1f during transportation. In addition, in order to make the structure such that the tamper band portion 1f can be peeled off in a state where the inner peripheral wall 1fa of the tamper band portion 1f is formed inside the outer peripheral wall 1ba of the upper lid portion 1a, as shown in Figures 1 and 2, it is preferable to form a gap portion 1t that becomes a space at a location where the thin-walled portion 1e is not formed. In order to form the gap portion 1t and the thin-walled portion 1e, etc., in order to make it easy to take out the product from the mold during injection molding, it is preferable to configure the mold as a split mold.

[0023] One end 1j of the tamper band portion 1f is formed near the lower end of the flange portion 1d. The end 1k on the opposite side of the end 1j has a knob portion 1l, and a rib 1w composed of irregularities for increasing frictional force is formed on the back surface of the knob portion 1l. The rib 1w is composed of a plurality of convex shapes linearly extending in the vertical direction. Also, by starting to peel off from the knob portion 1l, the thin-walled portion 1e and the second thin-walled portion 1m formed at the upper end of the protrusion 1g fitted into the locking portion 1h are cut, and the tamper band portion 1f can be removed. The thin-walled portion 1e and the second thin-walled portion 1m may be installed separately at a plurality of locations, and the installation position and number are not particularly limited. Further, an arrow mark 1u indicating the direction of peeling the tamper band portion 1f from the upper lid portion 1a is formed on the outer surface of the knob portion 1l.

[0024] As shown in FIGS. 5, 8, and 9, on the inner side wall of the anti-tampering hinge cap 1, a first rib 1n having a structure of at least one or more protruding rails is formed so as to fit into the groove of the drain slit 2e. This is the case even when shrinkage of the resin of the anti-tampering hinge cap 1 and the spout 2 occurs when placed in a retort (pressure sterilization kettle) and heated for sterilization. Since the first rib 1n and the drain slit 2e are in a state of fitting into each other, there will be no problem of displacement in the lateral rotation direction.

[0025] It is desirable that the number of the first ribs 1n be the same as the number of passages in which the drain slits 2e are formed as a single continuous passage. However, even if only one first rib 1n is formed, the function can be exerted. In addition, when the first rib 1n is designed to be fitted into all the drain slits 2e, as shown in FIGS. 5, 8, and 9, a second drain slit 1o serving as a vertical rib recessed in a concave shape may be formed on the inner side wall of the hinge cap 1 with anti-tampering means at a position adjacent to the first rib 1n. The meaning of providing the second drain slit 1o is that when heat treatment is performed by putting it in a retort (autoclave for pressure sterilization) and heating and sterilizing, water may enter the inside of the main body portion 1b. Therefore, even if all the drain slits 2e are blocked by the first rib n, it has the effect of quickly discharging the water that has entered from the second drain slit 1o to the outside.

[0026] FIG. 12 is an enlarged cross-sectional view of the y portion of FIG. 9, and FIG. 13 is an enlarged view of an enlarged cross-section of a stepped portion 1bc serving as a step provided on the outer peripheral wall of the top surface of the main body portion 1b. However, when heat treatment is performed by putting it in a retort (autoclave for pressure sterilization) and heating and sterilizing, water also enters the inside of the upper lid portion 1a. In order to let the water that has entered the inside of the upper lid portion 1a flow out to the outside, as shown in FIG. 12 or FIG. 13, a top plate portion 1bb is formed in which the top surface of the main body portion 1b inclines downward from the central position toward the outer direction. In addition, a stepped portion 1bc that drops to the lower end is provided at the outer peripheral edge of the top plate portion 1bb, and the stepped portion 1bc inclines downward from the inside to the outside direction. Further, as shown in FIGS. 1 to 3 and FIG. 13, a plurality of concave third drain slits 1w serving as passages are formed in the stepped portion 1bc in the outer direction. Thereby, the water that has entered the inside of the upper lid portion 1a flows downward due to the inclination of the top plate portion 1bb and moves to the stepped portion 1bc, and the water that has flowed down to the stepped portion 1bc flows down to the third drain slit 1w due to the inclination of the stepped portion 1bc, and the water that has entered the inside of the upper lid portion 1a can be discharged to the outside. In addition, by forming four of the third drain slits 1w at equal intervals in a circumferential shape, water drainage can be started in a well-balanced manner and water can be drained more quickly. However, the number of the third drain slits 1w formed is not limited to four.

[0027] Further, a second rib 1p that engages with the protrusion 2d formed on the spout 2 is formed on the inner surface of the main body portion 1b. The cross-section of the second rib 1p may be formed by connecting convex shapes, each of which is a substantially right-angled triangle protruding outward as shown in FIG. 8, in a ring shape. Also, when the second drain slit 1o is formed, the second rib 1p may be partially formed at a location where the second drain slit 1o is not formed. When the anti-tampering hinge cap 1 is plugged into and fitted onto the spout 2, the second rib 1p and the protrusion 2d are fitted together by overcoming the protrusion 2d, resulting in a tamper-proofing effect and making it impossible to easily remove the anti-tampering hinge cap 1 from the spout 2. Since the anti-tampering hinge cap 1 of the present invention is formed with a tamper band portion 1f for preventing unauthorized opening, even when displayed at a storefront, the product can be provided to consumers with confidence.

[0028] As shown in FIGS. 5 and 8, the lower end of the first rib 1n forms a substantially V shape, and the inclination of the end surfaces that are symmetric with respect to the substantially V shape forms an inclination that faces and contacts the inclination on the upper end side of the screw 2c, so that the surfaces slide against each other and the first rib 1n can be easily inserted into the drain slit 2e formed in the spout 2. Further, since the first rib 1n forms a gentle inverted U shape from the upper end to the lower end, when the side wall surface of the first rib 1n having the inverted U shape is pushed into the drain slit 2e, it has a structure that is difficult to come out once it is fitted.

[0029] As shown in FIGS. 5 and 8, a plurality of protruding third ribs 1q are formed at equal intervals on the inner peripheral wall inside the upper end of the main body portion 1b. This is provided to hold the peripheral wall of the spout 2's outlet 2a in place by sandwiching it between an inner ring 1v formed inside the main body portion 1b and the third rib 1q formed on the inner wall of the main body portion 1b when the anti-tampering hinge cap 1 is plugged into and fitted onto the spout 2, so as to prevent the peripheral wall of the spout 2's outlet 2a from spreading outward. Thereby, a product that can maintain airtightness and does not leak liquid can be provided.

[0030] Also, as shown in FIGS. 8 and 10, the locking portion 1h on the surface in contact with the protrusion 1g and the protrusion 1g on the surface in contact with the locking portion 1h are formed with a concave portion 1r on one side and a convex portion 1s on the other side, so that a hinge cap 1 with anti-tampering function that fits together can be provided. Thereby, even when changing from the unopened state shown in FIGS. 8, 9, and 16 to the opened state where the tamper band portion 1f in FIGS. 10, 11, and 17 is removed, as shown in FIG. 10, the protrusion 1g remains engaged with the locking portion 1h and can be retained by the locking portion 1h. Further, the outer diameters of the main body portion 1b and the upper lid portion 1a are the same, and after removing the tamper band portion 1f, as shown in FIGS. 11 and 17, an integral and neat appearance is obtained.

[0031] When capping the pouch container 3 with the spout 2 filled with the contents with the anti-tampering hinge cap 1 of the present invention, even when using a capper to move or cap, the shape is such that the tamper band portion 1f does not interfere and the capper can be used.

[0032] The contents filled in the pouch container 3 with the anti-tampering hinge cap 1 of the present invention can be used for liquid or paste-like foods such as jam, sauce, jelly, beverage, seasoning, as well as shampoo, body soap, adhesive, lotion, or products that need to be put into a retort (pressure sterilization kettle) and undergo heat sterilization such as simmering. Further, the anti-tampering hinge cap 1 of the present invention is easy to open and hygienic, and the cap can be easily opened and closed during use. Also, the anti-tampering hinge cap 1 of the present invention is of a type that can be plugged and fitted into the spout 2, and an anti-tampering hinge cap 1 with high airtightness that can control the oxidative deterioration of the contents can be provided.

Explanation of Reference Numerals

[0033] 1 Anti-tampering hinge cap 1a Upper lid portion 1b Body part 1ba Outer peripheral wall 1bb Top plate part 1bc Step part 1c Hinge part 1d Flange part 1e Thin wall part 1f Tamper band part 1fa Inner peripheral wall 1g Protrusion part 1h Locking part 1i Finger placement space 1j End part 1k End part 1l Knob part 1m Second thin wall part 1n First rib 1o Second drain slit 1p Second rib 1q Third rib 1r Recess 1s Projection 1t Gap part 1u Arrow symbol 1v Inner ring 1w Third drain slit 2 Spout 2a Pouring outlet 2b Body 2c Screw 2d Protrusion 2e Drain slit 2f Welded part 3 Pouch container

Claims

1. A spout having a pouring outlet for discharging the content, which can be fixed by heat-sealing to the opening of a pouch container of a bag body made of a flexible film capable of accommodating the content, and a hinge cap having a tamper band portion fixed to the spout and removed at the time of opening to prevent unauthorized opening, which is a hinge cap with anti-tampering function, wherein the spout forms a cylindrical main body, a screw for screwing and an annular protrusion are formed on the outer peripheral side wall surface of the cylindrical shape, a drain slit is provided in the screw, the hinge cap includes a main body portion fixed to the pouring outlet of the spout, an upper lid portion having a flange portion connected via the main body portion and a hinge portion, and the tamper band portion connected to the lower end side of the side wall of the upper lid portion via a plurality of thin portions, at least one or more protruding first ribs are formed inside the side wall of the main body portion of the hinge cap so as to fit into the drain slit, at least one or more recessed second drain slits adjacent to the first rib are formed, a plurality of second ribs for engaging with the protrusion are formed along the circumference on the peripheral wall inside the lower end of the main body portion, by covering the pouring outlet of the spout with the hinge cap and plugging it, the first rib can be fitted into the drain slit, and the second rib can be fitted over the protrusion, the tamper band portion is provided with a protrusion extending to the bag body side, the lower end of the flange portion and the upper end of the tamper band portion are connected by the thin portion, and the lower end of the tamper band portion and the upper end of the protrusion are connected by a second thin portion, when the protrusion is fitted and engaged with a locking portion provided on the main body portion, the tamper band portion on the lower end side of the flange portion forms the same protruding width as the flange portion, a hinge cap with anti-tampering function, characterized in that a finger insertion space appears between the flange portion and the locking portion by removing the tamper band portion at the time of opening.

2. The inner peripheral wall of the tamper band portion is formed inside the outer peripheral wall of the upper lid portion, so that the tamper band portion is in close contact with the outer peripheral wall of the main body portion. One end of the tamper band portion is formed near the lower end of the flange portion, the end opposite to the said end has a knob portion, unevenness for increasing frictional force is formed on the back surface of the knob portion, and by starting peeling from the knob portion, the thin portion and the second thin portion are cut, and the tamper band portion is removed. The hinge cap with anti-tampering function according to claim 1, characterized in that.

3. A top plate portion that slopes downward and outward from the center position of the top surface of the main body portion is formed. A stepped portion that drops to a lower end than the top plate portion is provided at the outer peripheral edge of the top plate portion. The stepped portion slopes downward from the inside to the outside, and a plurality of recessed third drain slits that serve as passages are formed in part of the stepped portion. The hinge cap with anti-tampering function according to claim 1 or claim 2, characterized in that.

4. A plurality of third ribs are formed at equal intervals on the circumference of the inner peripheral wall at the upper inner end of the main body portion. The hinge cap with anti-tampering function according to any one of claims 1 to 3, characterized in that.

5. On the locking portion of the surface in contact with the protrusion and the protrusion of the surface in contact with the locking portion, a concave portion is formed on one side and a convex portion is formed on the other side, so that they are fitted to each other. The hinge cap with anti-tampering function according to any one of claims 1 to 4, characterized in that.

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