Cap

Abstract

To provide a cap that removes a detachment part from an inside plug to form a bung hole in the inner plug, and thereafter, turns a lid in a plug closing direction to close the plug, and even if a container is erroneously dropped in the plug closed state, can prevent the detachment from falling from between an inner holding cylinder and an outer holding cylinder due to impact of dropping.SOLUTION: A first outer peripheral side engaging projection 41 is formed on an outer periphery of a detachment part 14, a first inner peripheral side engaging projection 42 is formed on an inner periphery of the detachment part 14, a second inner peripheral side engaging projection 45 is formed on an inner periphery of an outer holding cylinder 33, and a second outer peripheral side engaging projection 46 is formed on an outer periphery of an inner holding cylinder 32. The second inner peripheral side engaging projection 45 has a projection 48. When a lid 5 rotates in a plug opening direction O, and the second outer peripheral side engaging projection 46 contacts the first inner peripheral side engaging projection 42 and the second inner peripheral side engaging projection 45 contacts the first outer peripheral side engaging projection 41, the projection 48 of the second inner peripheral side engaging projection 45 bites into the first outer peripheral side engaging projection 41.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a cap having an inside plug that is attached to a container and a screw-type lid that is detachable from the inside plug. [Background technology]

[0002] Conventionally, as shown in FIG. 14, this type of cap has an inner stopper 103 attached to a container 102, a screw-type lid 104, and a cylindrical detachable portion 105, and when detachable portion 105 detaches from inner stopper 103, a spout is formed in inner stopper 103.

[0003] The lid 104 has an inner retaining tube 107 and an outer retaining tube 108, and when the lid 104 is closed, the detachable portion 105 is inserted between the inner retaining tube 107 and the outer retaining tube 108 of the lid 104, and the tip portion of the detachable portion 105 and the base portion of the outer retaining tube 108 are engaged with each other via the engagement portion 109.

[0004] As shown in Figures 14 and 15, a first outer circumference side engaging protrusion 111 is formed on the outer circumference of the detachment portion 105, a first inner circumference side engaging protrusion 112 is formed on the inner circumference of the detachment portion 105, a second inner circumference side engaging protrusion 113 is formed on the inner circumference of the outer retaining tube 108, and a second outer circumference side engaging protrusion 114 is formed on the outer circumference of the inner retaining tube 107.

[0005] As shown in FIG. 14, the engagement portion 109 has a protrusion 117 provided on the outer periphery of the tip of the detachment portion 105 and a recess 118 provided on the inner periphery of the base of the outer holding tube .

[0006] According to this, when opening the unopened cap 101 after fitting the lid 104 to the inside plug 103 as shown in Fig. 14, by rotating the lid 104 in the opening direction O as shown in Fig. 15, the second outer circumferential side engaging protrusion 114 comes into contact with the first inner circumferential side engaging protrusion 112 and the second inner circumferential side engaging protrusion 113 comes into contact with the first outer circumferential side engaging protrusion 111 as shown by the solid line in Fig. 16. As a result, the rotational torque generated when the lid 104 is rotated acts on the detachment portion 105 via the second inner circumferential side engaging protrusion 113 and the first outer circumferential side engaging protrusion 111 and the second outer circumferential side engaging protrusion 114 and the first inner circumferential side engaging protrusion 112, causing the weakened portion 119 formed around the detachment portion 105 to break, causing the detachment portion 105 to detach from the inside plug 103, and forming a spout in the inside plug 103.

[0007] At this time, the detachment portion 105 is inserted between the inner retaining tube 107 and the outer retaining tube 108, and the convex portion 117 fits into the concave portion 118, so that the detachment portion 105 detached from the inner stopper 103 is held between the inner retaining tube 107 and the outer retaining tube 108 of the lid 104. The above-mentioned cap 101 is disclosed in the following patent document. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 6941351 Summary of the Invention [Problem to be solved by the invention]

[0009] However, in the conventional type described above, when the lid 104 is turned in the opening direction O to detach the detachment portion 105 from the inner plug 103 and form a spout in the inner plug 103, the lid 104 is then turned in the closing direction S to close the cap 101, and if the container 102 is accidentally dropped onto a floor or the like in this closed state, the impact of the drop may cause the detachment portion 105 to bend radially inward 115 (see Figure 14), causing the convex portion 117 of the engagement portion 109 to detach from the concave portion 118, and causing the detachment portion 105 to fall off from between the inner retaining tube 107 and the outer retaining tube 108 of the lid 104.

[0010] To provide a cap which can prevent the detachable part from falling off from between the inner and outer retaining tubes of the lid due to the impact of the drop, even if the container is accidentally dropped in this closed state after the detachable part is detached from the inner plug and a pouring outlet is formed in the inner plug and the lid is turned in the closing direction to close the cap. [Means for solving the problem]

[0011] In order to achieve the above object, the first invention provides a container having an inner plug that is attached to a container and a screw-type lid that can be attached and detached to the inner plug by rotating the lid, The inner plug has a cylindrical detachment portion surrounded by a breakable weakened portion, A cap in which a spout is formed in the inner plug by breaking the weakened portion and separating the detachable portion from the inner plug, The lid has an inner retaining cylinder and an outer retaining cylinder arranged in a double layer inside and outside, With the lid closed, the detachable portion of the inner plug is inserted between the inner retaining tube and the outer retaining tube of the lid, The tip portion of the detachment portion and the base portion of the inner holding tube or the base portion of the outer holding tube are engaged with each other via the engagement portion, A first outer circumferential engagement portion is formed on the outer periphery of the detachment portion, A first inner circumferential engaging portion is formed on the inner circumferential surface of the detachment portion, A second inner circumference side engagement portion is formed on the inner circumference of the outer holding tube, A second outer circumferential engaging portion is formed on the outer periphery of the inner retaining tube, one of the second inner circumference side engaging portion and the first outer circumference side engaging portion has a projection that projects toward the other engaging portion and has a pointed tip; When the lid is rotated in the opening direction and the second outer peripheral side engagement portion abuts the first inner peripheral side engagement portion in the opening direction and the second inner peripheral side engagement portion abuts the first outer peripheral side engagement portion in the opening direction, the tip of the protrusion of one of the engagement portions, the second inner peripheral side engagement portion or the first outer peripheral side engagement portion, bites into the other engagement portion.

[0012] According to this, after the lid is fitted to the inner plug, when an unopened cap is opened, the lid is rotated in the opening direction, causing the second outer peripheral side engaging portion to abut against the first inner peripheral side engaging portion and the second inner peripheral side engaging portion to abut against the first outer peripheral side engaging portion. As a result, the rotational torque generated when the lid is rotated acts on the detachment portion via the second inner peripheral side engaging portion and the first outer peripheral side engaging portion and the second outer peripheral side engaging portion and the first inner peripheral side engaging portion, causing the weakened portion to break and the detachment portion to detach from the inner plug, forming a spout in the inner plug.

[0013] At this time, the tip of the protrusion of either the second inner circumference side engaging portion or the first outer circumference side engaging portion bites into the other engaging portion. In addition, since the detachable portion is inserted between the inner retaining tube and the outer retaining tube, and the tip portion of the detachable portion engages with the base portion of the inner retaining tube or the base portion of the outer retaining tube via the engagement portion, the detachable portion detached from the inner plug is held between the inner retaining tube and the outer retaining tube of the lid.

[0014] Thereafter, when the lid is turned in the closing direction to close the cap, and the container is accidentally dropped to the floor or the like in this closed state, the tip of the protrusion of either the second inner circumference side engaging portion or the first outer circumference side engaging portion is engaged with the other engaging portion as described above, so that the first outer circumference side engaging portion and the second inner circumference side engaging portion are connected in the radial direction via the protrusion. This makes it difficult for the detachment portion to bend in the radial direction even when subjected to the shock of the drop, and prevents the engagement portion between the tip portion of the detachment portion and the base portion of the inner holding tube or the engagement portion between the tip portion of the detachment portion and the base portion of the outer holding tube from coming off. This makes it possible to prevent the detachment portion from falling off between the inner holding tube and the outer holding tube of the lid due to the shock of the drop.

[0015] The second invention has an inner plug that is attached to a container, and a screw-type lid that can be attached and detached to the inner plug by rotating it, The inner plug has a cylindrical detachment portion surrounded by a breakable weakened portion, A cap in which a spout is formed in the inner plug by breaking the weakened portion and separating the detachable portion from the inner plug, The lid has an inner retaining cylinder and an outer retaining cylinder arranged in a double layer inside and outside, With the lid closed, the detachable portion of the inner plug is inserted between the inner retaining tube and the outer retaining tube of the lid, The tip portion of the detachment portion and the base portion of the inner holding tube or the base portion of the outer holding tube are engaged with each other via the engagement portion, A first outer circumferential engagement portion is formed on the outer periphery of the detachment portion, A first inner circumferential engaging portion is formed on the inner circumferential surface of the detachment portion, A second inner circumference side engagement portion is formed on the inner circumference of the outer holding tube, A second outer circumferential engaging portion is formed on the outer periphery of the inner retaining tube, one of the second outer circumferential engaging portion and the first inner circumferential engaging portion has a projection that projects toward the other engaging portion and has a pointed tip; When the lid is rotated in the opening direction and the second outer peripheral side engagement portion abuts the first inner peripheral side engagement portion in the opening direction and the second inner peripheral side engagement portion abuts the first outer peripheral side engagement portion in the opening direction, the tip of the protrusion of one of the engagement portions, the second outer peripheral side engagement portion or the first inner peripheral side engagement portion, bites into the other engagement portion.

[0016] According to this, after the lid is attached to the inner plug, when the unopened cap is opened, the lid is turned in the opening direction to form a spout in the inner plug. At this time, the tip of the protrusion of either the second outer circumferential engaging portion or the first inner circumferential engaging portion bites into the other engaging portion.

[0017] Thereafter, when the lid is turned in the closing direction to close the cap, and the container is accidentally dropped to the floor or the like in this closed state, the tip of the protrusion of either the second outer peripheral side engaging portion or the first inner peripheral side engaging portion is engaged with the other engaging portion as described above, so that the first inner peripheral side engaging portion and the second outer peripheral side engaging portion are connected in the radial direction via the protrusion. This makes it difficult for the detachment portion to bend in the radial direction even when subjected to the shock of the drop, and prevents the engagement portion between the tip portion of the detachment portion and the base portion of the inner holding tube or the engagement portion between the tip portion of the detachment portion and the base portion of the outer holding tube from coming off. This makes it possible to prevent the detachment portion from falling off between the inner holding tube and the outer holding tube of the lid due to the shock of the drop.

[0018] In the cap according to the third aspect of the present invention, the tip of the projection is sharply pointed. With this, after the lid is screwed onto the inner plug and attached, when the lid of an unopened cap is turned in the opening direction, the tip of the protrusion of one of the engaging portions can be securely inserted into the other engaging portion.

[0019] In the cap of the fourth invention, the inside plug and the lid are made of resin, The hardness of the inner stopper and the lid are different, A protrusion is provided on either the inner plug or the lid, whichever is harder. According to this, since the projection of the one engaging portion is harder than the other engaging portion, the tip of the projection of the one engaging portion can be securely inserted into the other engaging portion. Effect of the Invention

[0020] As described above, according to the present invention, the detachable portion is detached from the inner plug and a spout is formed in the inner plug, and then the lid is rotated in the closing direction to close the plug. Even if the container is accidentally dropped in this closed state, the impact of the drop can be prevented from causing the detachable portion to fall off from between the inner and outer retaining tubes of the lid. [Brief description of the drawings]

[0021] [Figure 1] 1 is a cross-sectional view of a cap according to a first embodiment of the present invention. [Diagram 2] FIG. 4 is a cross-sectional view of the inner plug of the cap. [Diagram 3] FIG. [Figure 4] FIG. 4 is a cross-sectional view of the lid of the cap. [Diagram 5] FIG. [Figure 6] 2 is a cross-sectional view taken along the line AA in FIG. [Figure 7] 1 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential engaging portion, the first inner circumferential engaging portion, the second inner circumferential engaging portion, and the second outer circumferential engaging portion when the lid of the cap is attached to the inner plug. [Figure 8] 1 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential engaging portion, the first inner circumferential engaging portion, the second inner circumferential engaging portion, and the second outer circumferential engaging portion when the lid of the cap is rotated in the opening direction. FIG. [Figure 9] 4 is a cross-sectional view of the cap, showing the state in which the cap is opened and the detachable portion is detached from the inner plug. [Figure 10] 1 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential side engaging portion, the first inner circumferential side engaging portion, the second inner circumferential side engaging portion, and the second outer circumferential side engaging portion when the lid of the cap in the second embodiment of the present invention is attached to the inner plug and then the lid is turned in the opening direction. [Figure 11] FIG. 13 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential engaging portion, the first inner circumferential engaging portion, the second inner circumferential engaging portion, and the second outer circumferential engaging portion when the lid of the cap in the third embodiment of the present invention is attached to the inner plug. [Figure 12] 1 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential engaging portion, the first inner circumferential engaging portion, the second inner circumferential engaging portion, and the second outer circumferential engaging portion when the lid of the cap is rotated in the opening direction. FIG. [Figure 13] 11 is an enlarged cross-sectional view showing the positional relationship between the first outer circumference side engaging portion, the first inner circumference side engaging portion, the second inner circumference side engaging portion, and the second outer circumference side engaging portion when the lid of the cap in the fourth embodiment of the present invention is attached to the inner plug and then the lid is turned in the opening direction. [Figure 14] FIG. 1 is a cross-sectional view of a conventional cap. [Figure 15] 15 is a cross-sectional view taken along the line XX in FIG. 14. [Figure 16] 1 is an enlarged cross-sectional view showing the positional relationship between the first outer circumferential engaging portion, the first inner circumferential engaging portion, the second inner circumferential engaging portion, and the second outer circumferential engaging portion when the lid of the cap is rotated in the opening direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (First embodiment)

[0023] In the first embodiment, as shown in Fig. 1, reference numeral 1 denotes a cap, which has an inside plug 4 attached to an opening 3 of a container 2, and a screw-type lid 5 that can be attached and detached to the inside plug 4 by rotating it. The axial direction 6 of the cap 1 is defined as the up-down direction, the direction perpendicular to the axial center 7 of the cap 1 as the radial direction 8, and the circumferential direction about the axial center 7 as the circumferential direction 9.

[0024] As shown in Figures 1 to 3, the stopper 4 has a base portion 10 that is fitted into the mouth portion 3, a peripheral wall portion 11 provided on the base portion 10, a cylindrical pouring tube 12 provided on the peripheral wall portion 11, and a detachment portion 14 surrounded by a thin-walled breakable weakened portion 13. A groove 16 is formed around the entire periphery of the base portion 10, and the mouth portion 3 is fitted into the groove 16. A male thread 15 is formed on the outer circumferential surface of the peripheral wall portion 11. The separation portion 14 is located inside the pouring tube 12 and has a cylindrical portion 19 that is open at the top and a circular bottom wall portion 20 that closes the bottom of the cylindrical portion 19. As shown in FIG. 9, when the cap 1 is opened, the weakened portion 13 breaks and the detachable portion 14 detaches from the inner plug 4, whereby a pouring outlet 24 is formed in the pouring cylinder 12.

[0025] 1, 4 and 5, the lid 5 has a circular top plate portion 30, a cylindrical skirt portion 31 hanging down from the outer periphery of the top plate portion 30, inner and outer cylindrical retaining tubes 32, 33 arranged in a double layer, a cylindrical circumferential tube portion 34 with an open lower portion, and a cylindrical closing tube portion 35 with an open lower portion. The inner and outer retaining tubes 32, 33, the circumferential tube portion 34 and the closing tube portion 35 are inside the skirt portion 31 and are arranged concentrically about the axis 7.

[0026] An internal thread 38 that screws onto the external thread 15 of the inner plug 4 is provided on the inner peripheral surface of the peripheral tube portion 34. As shown in Fig. 1, with the lid 5 closed, the closing tube portion 35 is inserted into the tip of the dispensing tube 12, and the gap between the lid 5 and the dispensing tube 12 is sealed via the closing tube portion 35, and the cylindrical portion 19 of the detachment portion 14 is inserted between the inner retaining tube 32 and the outer retaining tube 33 of the lid 5.

[0027] 1, 2 and 4, the tip portion of the cylindrical portion 19 of the detachment portion 14 and the base portion of the outer holding tube 33 are fitted together via a fitting portion 25. The fitting portion 25 has a recess 26 and a protrusion 27 that fits into the recess 26. As shown in FIG. 2, the protrusion 27 is formed over the entire circumference of the outer periphery of the tip portion of the cylindrical portion 19 of the detachment portion 14. As shown in FIG. 4, the recess 26 is formed over the entire circumference of the inner periphery of the base portion of the outer holding tube 33.

[0028] As shown in FIGS. 1 to 3, a first outer periphery side engagement portion 41 is formed on the outer periphery of the cylindrical portion 19 of the detachment portion 14, and a first inner periphery side engagement portion 42 is formed on the inner periphery of the cylindrical portion 19.

[0029] The first outer peripheral engaging portions 41 protrude radially outward from the outer peripheral surface of the cylindrical portion 19, and a plurality (e.g., six) of them are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9. The first inner peripheral engaging portions 42 protrude radially inward from the inner peripheral surface of the cylindrical portion 19, and a plurality (e.g., six) of them are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9.

[0030] The first outer circumference side engaging portions 41 and the first inner circumference side engaging portions 42 are alternately arranged in the circumferential direction 9. That is, the first inner circumference side engaging portions 42 are located in the middle between the adjacent first outer circumference side engaging portions 41 in the circumferential direction 9, and the first outer circumference side engaging portions 41 are located in the middle between the adjacent first inner circumference side engaging portions 42 in the circumferential direction 9.

[0031] As shown in Figures 1, 4, and 5, a second inner circumference side engagement portion 45 is formed on the inner circumference of the outer retaining tube 33 of the lid 5, and a second outer circumference side engagement portion 46 is formed on the outer circumference of the inner retaining tube 32.

[0032] The second inner circumference side engaging portions 45 protrude radially inward from the inner circumference surface of the outer holding cylinder 33, and a plurality of them (for example, six of them) are formed at predetermined angular intervals (for example, 60°) in the circumferential direction 9.

[0033] The second outer peripheral engaging portions 46 protrude radially outward from the outer peripheral surface of the inner retaining cylinder 32, and a plurality of them (eg, six) are formed at predetermined angular intervals (eg, 60°) in the circumferential direction 9.

[0034] The second inner circumference side engaging portions 45 and the second outer circumference side engaging portions 46 are alternately disposed in the circumferential direction 9. That is, the second inner circumference side engaging portions 45 are located in the middle between the adjacent second outer circumference side engaging portions 46 in the circumferential direction 9, and the second outer circumference side engaging portions 46 are located in the middle between the adjacent second inner circumference side engaging portions 45 in the circumferential direction 9.

[0035] As shown in Figures 4 to 7, the second inner circumference side engagement portion 45 (one engagement portion) has a protrusion 48 that protrudes in the opening direction O toward the first outer circumference side engagement portion 41 (the other engagement portion). A tip 48a of the protrusion 48 is sharply pointed. The protrusion 48 has a triangular (wedge-shaped) cross-sectional shape, and is formed across the upper and lower ends of the second inner circumference side engagement portion 45.

[0036] As shown in Fig. 1, the lid 5 is attached to the inner plug 4 by being screwed onto the inner plug 4 from above downward. When the lid 5 is screwed onto the inner plug 4, as shown in Figs. 6 and 7, the second inner peripheral side engaging portions 45 are inserted between the adjacent first outer peripheral side engaging portions 41 in the circumferential direction 9, and the second outer peripheral side engaging portions 46 are inserted between the adjacent first inner peripheral side engaging portions 42 in the circumferential direction 9.

[0037] As shown in Fig. 1, when the lid 5 of the unopened cap 1 is rotated in the opening direction O after the lid 5 is attached to the inner plug 4, the second outer circumference side engaging portion 46 abuts against the first inner circumference side engaging portion 42 in the opening direction O, and the second inner circumference side engaging portion 45 abuts against the first outer circumference side engaging portion 41 in the opening direction O, as shown in Fig. 8. At this time, the tip 48a of the protrusion 48 of the second inner circumference side engaging portion 45 bites into the first outer circumference side engaging portion 41. The inside plug 4 and the lid 5 are made of resin. The resin used for the inside plug 4 and the resin used for the lid 5 have different hardness, and the lid 5 has a harder hardness than the inside plug 4. The operation of the above configuration will now be described.

[0038] The inner plug 4 and the lid 5 are manufactured, and the lid 5 is attached to the inner plug 4 in the correct position as shown in FIG. 1. As a result, as shown in FIGS. 6 and 7, the second inner side engagement portion 45 is inserted between adjacent first outer side engagement portions 41 in the circumferential direction 9, and the second outer side engagement portion 46 is inserted between adjacent first inner side engagement portions 42 in the circumferential direction 9, thereby attaching the lid 5 to the inner plug 4.

[0039] After the cap 1 is sealed, when the unopened cap 1 is opened, the lid 5 is rotated in the opening direction O as shown in Figure 8, so that the second inner side engagement portion 45 abuts against the first outer side engagement portion 41, and the second outer side engagement portion 46 abuts against the first inner side engagement portion 42.

[0040] As a result, the rotational torque generated when the lid 5 is rotated in the opening direction O acts on the detachment portion 14 via the second inner side engagement portion 45 and the first outer side engagement portion 41, and the second outer side engagement portion 46 and the first inner side engagement portion 42, causing the weakened portion 13 to break and the detachment portion 14 to detach from the inner plug 4, forming a spout 24 in the inner plug 4 as shown in Figure 9.

[0041] At this time, as shown in Fig. 8, tip 48a of projection 48 of second inner circumference side engaging portion 45 bites into first outer circumference side engaging portion 41. Also, as shown in Fig. 9, cylindrical portion 19 of detachable portion 14 is inserted between inner retaining tube 32 and outer retaining tube 33, and convex portion 27 (see Fig. 2) of detachable portion 14 is engaged with concave portion 26 (see Fig. 4) of outer retaining tube 33, so that detachable portion 14 detached from inside plug 4 is held between inner retaining tube 32 and outer retaining tube 33 of lid 5.

[0042] As described above, when the cap 1 is opened by rotating the lid 5 of the unopened cap 1 in the opening direction O, and then the cap 1 is closed by rotating the lid 5 in the closing direction S, and the container 2 is accidentally dropped to the floor or the like in this closed state, as shown in FIG. 8, the tip 48a of the projection 48 of the second inner circumference side engaging portion 45 is engaged with the first outer circumference side engaging portion 41, so that the first outer circumference side engaging portion 41 and the second inner circumference side engaging portion 45 are connected in the radial direction 8 via the projection 48. As a result, even if the shock of the drop is received, the cylindrical portion 19 of the detachment portion 14 is unlikely to bend toward the inside 53 in the radial direction 8, and the convex portion 27 (see FIG. 2) of the detachment portion 14 can be prevented from being detached from the concave portion 26 (see FIG. 4) of the outer holding tube 33. As a result, it is possible to prevent the detachment portion 14 from falling off between the inner holding tube 32 of the lid 5 and the outer holding tube 33 due to the shock of the drop.

[0043] Furthermore, as shown in FIG. 7, the tip 48a of the projection 48 is sharply pointed, so that the tip 48a of the projection 48 of the second inner circumference side engagement portion 45 can be securely engaged with the first outer circumference side engagement portion 41.

[0044] Furthermore, since the lid 5 is harder than the inner plug 4, the protrusion 48 of the lid 5 is harder than the first outer peripheral side engagement portion 41 of the inner plug 4, and the tip 48a of the protrusion 48 of the second inner peripheral side engagement portion 45 can be securely engaged with the first outer peripheral side engagement portion 41. (Second embodiment)

[0045] In the above-described first embodiment, as shown in Figures 7 and 8, the second inner side engagement portion 45 has a protrusion 48 that protrudes in the opening direction O toward the first outer side engagement portion 41, and the protrusion 48 is configured to bite into the first outer side engagement portion 41. However, in the second embodiment described below, as shown in Figure 10, the first outer side engagement portion 41 has a protrusion 48 that protrudes in the closing direction S toward the second inner side engagement portion 45, and the protrusion 48 is configured to bite into the second inner side engagement portion 45. In the second embodiment, the inside plug 4 has a harder hardness than the lid 5 .

[0046] According to this, after the lid 5 is fitted to the inner plug 4 in the correct position, when the unopened cap 1 is opened, the spout 24 is formed in the inner plug 4 by turning the lid 5 in the opening direction O. At this time, the tip 48a of the projection 48 of the first outer peripheral side engaging portion 41 bites into the second inner peripheral side engaging portion 45.

[0047] As described above, when the lid 5 of the unopened cap 1 is turned in the opening direction O to open the cap 1, and then the lid 5 is turned in the closing direction S to close the cap 1, if the container 2 is accidentally dropped to the floor or the like in this closed state, as shown in Fig. 10, the tip 48a of the projection 48 of the first outer peripheral side engaging portion 41 bites into the second inner peripheral side engaging portion 45, so that the first outer peripheral side engaging portion 41 and the second inner peripheral side engaging portion 45 are connected in the radial direction 8 via the projection 48. As a result, even if subjected to the impact of the drop, the cylindrical portion 19 of the detachment portion 14 is unlikely to bend toward the inside 53 in the radial direction 8, and the projection 27 (see Fig. 2) of the detachment portion 14 can be prevented from coming off the recess 26 (see Fig. 4) of the outer holding tube 33.

[0048] Furthermore, since the inner plug 4 is harder than the lid 5, the protrusion 48 of the inner plug 4 is harder than the second inner circumference side engagement portion 45 of the lid 5, and the tip 48a of the protrusion 48 of the first outer circumference side engagement portion 41 can be securely engaged with the second inner circumference side engagement portion 45. (Third embodiment)

[0049] 11 and 12, in the third embodiment, the second outer circumferential engaging portion 46 (one of the engaging portions) has a projection 48 that projects in the opening direction O toward the first inner circumferential engaging portion 42 (the other of the engaging portions), and is configured so that the projection 48 bites into the first inner circumferential engaging portion 42. Also, the lid 5 has a hardness higher than that of the inside plug 4.

[0050] According to this, after the lid 5 is fitted to the inner plug 4 in the correct position as shown in Fig. 11, when the unopened cap 1 is opened, the lid 5 is turned in the opening direction O to form the spout 24 in the inner plug 4. At this time, as shown in Fig. 12, the tip 48a of the projection 48 of the second outer peripheral side engaging portion 46 bites into the first inner peripheral side engaging portion 42.

[0051] As described above, when the lid 5 of the unopened cap 1 is turned in the opening direction O to open the cap 1, and then the lid 5 is turned in the closing direction S to close the cap 1, if the container 2 is accidentally dropped to the floor or the like in this closed state, the tip 48a of the projection 48 of the second outer peripheral side engagement portion 46 bites into the first inner peripheral side engagement portion 42 as shown in Fig. 12, so that the first inner peripheral side engagement portion 42 and the second outer peripheral side engagement portion 46 are connected in the radial direction 8 via the projection 48. As a result, even if subjected to the impact of the drop, the cylindrical portion 19 of the detachment portion 14 is unlikely to bend toward the inside 53 in the radial direction 8, and the projection 27 (see Fig. 2) of the detachment portion 14 can be prevented from coming off the recess 26 (see Fig. 4) of the outer holding tube 33. (Fourth embodiment)

[0052] In the above-mentioned third embodiment, as shown in Figures 11 and 12, the second outer peripheral side engagement portion 46 has a protrusion 48 that protrudes in the opening direction O toward the first inner peripheral side engagement portion 42, and the protrusion 48 is configured to bite into the first inner peripheral side engagement portion 42. However, in the fourth embodiment described below, as shown in Figure 13, the first inner peripheral side engagement portion 42 has a protrusion 48 that protrudes in the closing direction S toward the second outer peripheral side engagement portion 46, and the protrusion 48 is configured to bite into the second outer peripheral side engagement portion 46. In the fourth embodiment, the inside plug 4 has a harder hardness than the lid 5 .

[0053] According to this, after the lid 5 is fitted to the inner plug 4 in the correct position, when the unopened cap 1 is opened, the lid 5 is turned in the opening direction O to form the spout 24 in the inner plug 4. At this time, as shown in Fig. 13, the tip 48a of the projection 48 of the first inner circumference side engaging portion 42 bites into the second outer circumference side engaging portion 46.

[0054] As described above, when the lid 5 of the unopened cap 1 is turned in the opening direction O to open the cap 1, and then the lid 5 is turned in the closing direction S to close the cap 1, if the container 2 is accidentally dropped to the floor or the like in this closed state, the tip 48a of the projection 48 of the first inner circumference side engaging portion 42 bites into the second outer circumference side engaging portion 46 as shown in Fig. 13, so that the first inner circumference side engaging portion 42 and the second outer circumference side engaging portion 46 are connected in the radial direction 8 via the projection 48. As a result, even if subjected to the impact of being dropped, the cylindrical portion 19 of the detachment portion 14 is unlikely to bend toward the inside 53 in the radial direction 8, and the projection 27 (see Fig. 2) of the detachment portion 14 can be prevented from coming off the recess 26 (see Fig. 4) of the outer holding tube 33.

[0055] In the above first to fourth embodiments, as shown in Figures 1, 2 and 4, the convex portion 27 is formed on the outer periphery of the tip portion of the cylindrical portion 19 of the detachment portion 14, and the concave portion 26 is formed on the inner periphery of the base portion of the outer retaining tube 33, but it is also possible to form the convex portion 27 on the inner periphery of the base portion of the outer retaining tube 33, and the concave portion 26 on the outer periphery of the tip portion of the cylindrical portion 19 of the detachment portion 14.

[0056] In the above first to fourth embodiments, as shown in Fig. 1, the tip portion of the cylindrical portion 19 of the detachment portion 14 and the root portion of the outer retaining tube 33 are fitted together via the fitting portion 25, but the tip portion of the cylindrical portion 19 of the detachment portion 14 and the root portion of the inner retaining tube 32 may also be fitted together via the fitting portion 25. In this case, the protrusion 27 may be provided on the inner circumference of the tip portion of the cylindrical portion 19 of the detachment portion 14, and the recess 26 may be provided on the outer circumference of the root portion of the inner retaining tube 32, or the recess 26 may be provided on the inner circumference of the tip portion of the cylindrical portion 19 of the detachment portion 14, and the protrusion 27 may be provided on the outer circumference of the root portion of the inner retaining tube 32.

[0057] In addition, as an embodiment other than the first to fourth embodiments, the cap 1 may be configured such that the second inner side engagement portion 45 and the second outer side engagement portion 46 each have a protrusion 48, and the protrusion 48 of the second inner side engagement portion 45 bites into the first outer side engagement portion 41, and the protrusion 48 of the second outer side engagement portion 46 bites into the first inner side engagement portion 42.

[0058] Alternatively, the cap 1 may be configured such that the first outer peripheral side engagement portion 41 and the first inner peripheral side engagement portion 42 each have a protrusion 48, and the protrusion 48 of the first outer peripheral side engagement portion 41 bites into the second inner peripheral side engagement portion 45, and the protrusion 48 of the first inner peripheral side engagement portion 42 bites into the second outer peripheral side engagement portion 46. [Explanation of symbols]

[0059] 1 Cap 2 containers 4 Inner stopper 5 Lid 13 Weakened part 14 Detachment section 24 spout 25 Fitting part 32 Inner holding tube 33 Outer holding cylinder 41 First outer peripheral side engagement portion 42 First inner circumference side engagement portion 45 Second inner circumference side engagement portion 46 Second outer peripheral engaging portion 48 Protrusion 48a Tip O Opening direction

Claims

1. The container has an inner plug attached to the container and a screw-type lid that can be attached to and detached from the inner plug by rotating the lid. The inner plug has a cylindrical detachment portion surrounded by a breakable weakened portion, A cap in which a spout is formed in the inner plug by breaking the weakened portion and separating the detachable portion from the inner plug, The lid has an inner retaining cylinder and an outer retaining cylinder arranged in a double layer inside and outside, With the lid closed, the detachable portion of the inner plug is inserted between the inner retaining tube and the outer retaining tube of the lid, The tip portion of the detachment portion and the base portion of the inner holding tube or the base portion of the outer holding tube are engaged with each other via the engagement portion, A first outer circumferential engaging portion is formed on the outer periphery of the detachment portion, A first inner circumferential engaging portion is formed on the inner periphery of the detachment portion, A second inner circumference side engagement portion is formed on the inner circumference of the outer holding cylinder, A second outer circumferential engaging portion is formed on the outer periphery of the inner retaining cylinder, one of the second inner circumference side engaging portion and the first outer circumference side engaging portion has a projection that projects toward the other engaging portion and has a pointed tip; A cap characterized in that when the lid is rotated in the opening direction and the second outer peripheral side engaging portion abuts the first inner peripheral side engaging portion in the opening direction and the second inner peripheral side engaging portion abuts the first outer peripheral side engaging portion in the opening direction, the tip of the protrusion of one of the engaging portions, the second inner peripheral side engaging portion or the first outer peripheral side engaging portion, bites into the other engaging portion.

2. The container has an inner plug attached to the container and a screw-type lid that can be attached to and detached from the inner plug by rotating the lid. The inner plug has a cylindrical detachment portion surrounded by a breakable weakened portion, A cap in which a spout is formed in the inner plug by breaking the weakened portion and separating the detachable portion from the inner plug, The lid has an inner retaining cylinder and an outer retaining cylinder arranged in a double layer inside and outside, With the lid closed, the detachable portion of the inner plug is inserted between the inner retaining tube and the outer retaining tube of the lid, The tip portion of the detachment portion and the base portion of the inner holding tube or the base portion of the outer holding tube are engaged with each other via the engagement portion, A first outer circumferential engaging portion is formed on the outer periphery of the detachment portion, A first inner circumferential engaging portion is formed on the inner periphery of the detachment portion, A second inner circumference side engagement portion is formed on the inner circumference of the outer holding cylinder, A second outer circumferential engaging portion is formed on the outer periphery of the inner retaining cylinder, one of the second outer circumferential engaging portion and the first inner circumferential engaging portion has a projection that projects toward the other of the second outer circumferential engaging portion and has a pointed tip; A cap characterized in that when the lid is rotated in the opening direction and the second outer peripheral side engaging portion abuts the first inner peripheral side engaging portion in the opening direction and the second inner peripheral side engaging portion abuts the first outer peripheral side engaging portion in the opening direction, the tip of the protrusion of one of the engaging portions, the second outer peripheral side engaging portion or the first inner peripheral side engaging portion, bites into the other engaging portion.

3. 2. The cap according to claim 1, wherein the tip of the projection is sharply pointed.

4. The inner plug and the lid are made of resin. The hardness of the inner stopper and the lid are different, 3. The cap according to claim 1, wherein a protrusion is provided on either the inside plug or the lid, whichever is harder.

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