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 part 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. A first clearance 48 is formed between the second outer peripheral side engaging projection 46 and the inner periphery of the detachment 14 in a radial direction, a lid 5 rotates in a plug opening direction O, and the second outer peripheral side engaging projection 46 engages with the first inner peripheral side engaging projection 42. A protrusion 51, which fills the first clearance 48 in the state that the second inner peripheral side engaging projection 45 engages with the first outer peripheral side engaging projection 41, is provided on the detachment part 14.SELECTED DRAWING: Figure 7

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. 12, 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] 12 and 13, a first outer circumference side engagement protrusion 111 is formed on the outer circumference of the detachment portion 105, a first inner circumference side engagement protrusion 112 is formed on the inner circumference of the detachment portion 105, a second inner circumference side engagement protrusion 113 is formed on the inner circumference of the outer holding tube 108, and a second outer circumference side engagement protrusion 114 is formed on the outer circumference of the inner holding tube 107. As shown in Fig. 14, a gap 116 is formed between the second outer circumference side engagement protrusion 114 and the inner circumference of the detachment portion 105 in the radial direction 115.

[0005] As shown in FIG. 12, 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. 12, by rotating the lid 104 in the opening direction O as shown in Fig. 13, the second outer peripheral side engagement protrusion 114 moves in the opening direction O to engage with the first inner peripheral side engagement protrusion 112, and the second inner peripheral side engagement protrusion 113 moves in the opening direction O to engage with the first outer peripheral side engagement protrusion 111, as shown by the solid line in Fig. 14. As a result, the rotational torque generated when the lid 104 is rotated acts on the detachment portion 105 via the second inner peripheral side engagement protrusion 113 and the first outer peripheral side engagement protrusion 111 and the second outer peripheral side engagement protrusion 114 and the first inner peripheral side engagement protrusion 112, causing the weakened portion 119 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 above-mentioned conventional type, as described above, when lid 104 is turned in opening direction O to detach detachment portion 105 from inner plug 103 and a spout is formed in inner plug 103, and then lid 104 is turned in closing direction S to close cap 101, if container 102 is accidentally dropped onto a floor or the like in this closed state, the impact of the drop may cause detachment portion 105 to bend in radial direction 115, causing convex portion 117 of engagement portion 109 to detach from concave portion 118, and there is a risk that detachment portion 105 may fall off from between inner retaining tube 107 and outer retaining tube 108 of 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 spout 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 projection is formed on the outer periphery of the detachment portion, A first inner circumferential engagement protrusion is formed on the inner circumferential surface of the detachment portion, A second inner circumference side engagement projection is formed on the inner circumference of the outer holding cylinder, A second outer circumferential engagement projection is formed on the outer periphery of the inner retaining cylinder, A first gap is formed between the second outer circumferential engagement projection and an inner periphery of the detachment portion in the radial direction, A second gap is formed between the second inner circumferential engagement projection and the outer periphery of the detachment portion in the radial direction, When the lid is rotated in the opening direction, the second outer peripheral side engagement protrusion engages with the first inner peripheral side engagement protrusion in the opening direction, and the second inner peripheral side engagement protrusion engages with the first outer peripheral side engagement protrusion in the opening direction, a protrusion that fills at least one of the first gap and the second gap is provided in the removal 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, whereby the second outer peripheral side engagement protrusion engages with the first inner peripheral side engagement protrusion and the second inner peripheral side engagement protrusion engages with the first outer peripheral side engagement protrusion. As a result, the rotational torque generated when the lid is rotated acts on the detachment portion via the second inner peripheral side engagement protrusion and the first outer peripheral side engagement protrusion and the second outer peripheral side engagement protrusion and the first inner peripheral side engagement protrusion, causing the weakened portion to break and the detachment portion to detach from the inner plug, forming a pouring outlet in the inner plug.

[0013] At this time, the detachable part is inserted between the inner holding tube and the outer holding tube, and the tip part of the detachable part is engaged with the root part of the inner holding tube or the root part of the outer holding tube via the engagement part, so that the detachable part detached from the inner plug is held between the inner holding tube and the outer holding tube of the lid. In this state where the detachable part is held by the lid, the protrusion of the detachable part fills at least one of the first gap and the second gap.

[0014] Thereafter, the lid is turned in the closing direction to close the cap, and when the container is accidentally dropped to the floor or the like in this closed state, the protrusion of the detachable part fills at least one of the first and second gaps as described above, so that even if it receives the shock of the drop, the detachable part is less likely to bend radially, and the engagement part between the tip part of the detachable part and the base part of the inner holding tube or the engagement part between the tip part of the detachable part and the base part of the outer holding tube can be prevented from coming off. This makes it possible to prevent the detachable part from falling off from between the inner holding tube and the outer holding tube of the lid due to the shock of the drop.

[0015] In the cap according to the second aspect of the present invention, the fitting portion has a recess and a protrusion that fits into the recess, One of the protrusion and the recess is provided on the outer periphery of the release portion, and the other is provided on the inner periphery of the outer holding tube, The protrusion protrudes radially inward from the inner circumference of the removal portion, and fills the first gap with the second outer circumference side engagement protrusion engaging with the first inner circumference side engagement protrusion in the opening direction and the second inner circumference side engagement protrusion engaging with the first outer circumference side engagement protrusion in the opening direction.

[0016] According to this, when the lid of an unopened cap is turned in the opening direction to open the cap, and then turned in the closing direction to close the cap, if the container is accidentally dropped to the floor or the like in this closed state, the protrusion of the detachment part fills the first gap, so that even if it receives the shock of the drop, the detachment part is unlikely to bend radially inward, and the convex part of the engagement part can be prevented from detaching from the concave part. This makes it possible to prevent the detachment part from falling off between the inner and outer holding tubes of the lid due to the shock of the drop.

[0017] In the cap of the third invention, when the lid is screwed onto the inner plug and attached, the second outer peripheral engaging projection is spaced apart from the protruding portion in the plugging direction, When the lid is rotated in the opening direction and the second outer peripheral side engagement protrusion engages with the first inner peripheral side engagement protrusion in the opening direction and the second inner peripheral side engagement protrusion engages with the first outer peripheral side engagement protrusion in the opening direction, the second outer peripheral side engagement protrusion overlaps with the protrusion in the radial direction.

[0018] According to this, when the lid is fitted onto the inner plug, the second outer circumferential engaging projection is separated from the protruding portion, so that resistance during fitting can be reduced. When the lid of the unopened cap is turned in the opening direction after plugging, the second outer circumferential engaging projection engages with the first inner circumferential engaging projection in the opening direction and overlaps with the protrusion in the radial direction, and the second inner circumferential engaging projection engages with the first outer circumferential engaging projection in the opening direction, so that the first gap is filled by the protrusion. Effect of the Invention

[0019] 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]

[0020] [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 peripheral side engagement projection, the first inner peripheral side engagement projection, the second inner peripheral side engagement projection, and the second outer peripheral side engagement projection when the lid of the cap is fitted onto the inner plug. [Figure 8] 11 is an enlarged cross-sectional view showing the positional relationship between the first outer peripheral side engagement projection, the first inner peripheral side engagement projection, the second inner peripheral side engagement projection, and the second outer peripheral side engagement projection 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] An enlarged cross-sectional view showing the positional relationship between the first outer peripheral side engagement projection, the first inner peripheral side engagement projection, the second inner peripheral side engagement projection, and the second outer peripheral side engagement projection when the lid of the cap in the second embodiment of the present invention is attached to the inner plug. [Figure 11] 11 is an enlarged cross-sectional view showing the positional relationship between the first outer peripheral side engagement projection, the first inner peripheral side engagement projection, the second inner peripheral side engagement projection, and the second outer peripheral side engagement projection when the lid of the cap is rotated in the opening direction. FIG. [Figure 12] FIG. 1 is a cross-sectional view of a conventional cap. [Figure 13] 13 is a cross-sectional view taken along the line XX in FIG. [Figure 14] 11 is an enlarged cross-sectional view showing the positional relationship between the first outer peripheral side engagement projection, the first inner peripheral side engagement projection, the second inner peripheral side engagement projection, and the second outer peripheral side engagement projection when the lid of the cap is rotated in the opening direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. (First embodiment)

[0022] 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.

[0023] 1 to 3, the inside plug 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 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.

[0024] 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.

[0025] 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 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.

[0026] 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.

[0027] As shown in FIGS. 1 to 3, a first outer periphery side engagement projection 41 is formed on the outer periphery of the cylindrical portion 19 of the detachment portion 14, and a first inner periphery side engagement projection 42 is formed on the inner periphery of the cylindrical portion 19.

[0028] The first outer peripheral side engagement projections 41 protrude radially outward from the outer peripheral surface of the cylindrical portion 19, and a plurality of (e.g., six) first outer peripheral side engagement projections 41 are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9. The first inner peripheral side engagement projections 42 protrude radially inward from the inner peripheral surface of the cylindrical portion 19, and a plurality of (e.g., six) first inner peripheral side engagement projections 42 are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9.

[0029] The first outer circumference side engagement projections 41 and the first inner circumference side engagement projections 42 are alternately arranged in the circumferential direction 9. That is, the first inner circumference side engagement projections 42 are located in the middle between adjacent first outer circumference side engagement projections 41 in the circumferential direction 9, and the first outer circumference side engagement projections 41 are located in the middle between adjacent first inner circumference side engagement projections 42 in the circumferential direction 9.

[0030] As shown in Figures 1, 4, and 5, a second inner circumference side engagement protrusion 45 is formed on the inner circumference of the outer retaining tube 33 of the lid 5, and a second outer circumference side engagement protrusion 46 is formed on the outer circumference of the inner retaining tube 32.

[0031] The second inner peripheral engaging projections 45 protrude radially inward from the inner peripheral surface of the outer holding cylinder 33, and a plurality of them (for example, six projections) are formed at predetermined angular intervals (for example, 60°) in the circumferential direction 9.

[0032] The second outer peripheral side engagement projections 46 protrude radially outward from the outer peripheral surface of the inner retaining cylinder 32, and a plurality of them (eg, six projections) are formed at predetermined angular intervals (eg, 60°) in the circumferential direction 9.

[0033] The second inner circumference side engagement projections 45 and the second outer circumference side engagement projections 46 are alternately arranged in the circumferential direction 9. That is, the second inner circumference side engagement projections 45 are located in the middle between adjacent second outer circumference side engagement projections 46 in the circumferential direction 9, and the second outer circumference side engagement projections 46 are located in the middle between adjacent second inner circumference side engagement projections 45 in the circumferential direction 9.

[0034] 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 Fig. 6, the second inner peripheral side engagement projection 45 is inserted between adjacent first outer peripheral side engagement projections 41 in the circumferential direction 9, and the second outer peripheral side engagement projection 46 is inserted between adjacent first inner peripheral side engagement projections 42 in the circumferential direction 9.

[0035] When the lid 5 is fitted onto the inner plug 4 as described above, as shown in FIG. 7 , a first gap 48 is formed between the second outer peripheral side engagement protrusion 46 in the radial direction 8 and the inner peripheral surface of the cylindrical portion 19 of the detachment portion 14, and a second gap 49 is formed between the second inner peripheral side engagement protrusion 45 in the radial direction 8 and the outer peripheral surface of the cylindrical portion 19 of the detachment portion 14.

[0036] After the lid 5 is attached to the inner plug 4 as shown in Figure 1, when the lid 5 of the unopened cap 1 is rotated in the opening direction O, the second outer peripheral side engagement protrusion 46 engages with the first inner peripheral side engagement protrusion 42 in the opening direction O, and the second inner peripheral side engagement protrusion 45 engages with the first outer peripheral side engagement protrusion 41 in the opening direction O, as shown in Figure 8.

[0037] When this engaged state is reached, a protrusion 51 that fills the first gap 48 is provided on the separation portion 14. As shown in Figures 2, 3 and 6 to 8, the protrusions 51 protrude inward in the radial direction 8 from the inner circumferential surface of the cylindrical portion 19 of the separation portion 14, and a plurality of protrusions (e.g., six protrusions) are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9. The protrusions 51 are adjacent to the first inner circumferential engagement projection 42 in the plugging direction S, and are formed from the upper end to the bottom of the cylindrical portion 19.

[0038] As shown in Fig. 7, when the lid 5 is fitted to the inside plug 4 in the correct position, the second outer peripheral engaging projection 46 is spaced apart from the protrusion 51 in the plugging direction S. After fitting, the lid 5 of the unopened cap 1 is rotated in the unplugging direction O, and as shown in Fig. 8, when the second outer peripheral engaging projection 46 engages with the first inner peripheral engaging projection 42 in the unplugging direction O and the second inner peripheral engaging projection 45 engages with the first outer peripheral engaging projection 41 in the unplugging direction O, the second outer peripheral engaging projection 46 overlaps with the protrusion 51 in the radial direction 8. The operation of the above configuration will now be described.

[0039] By manufacturing the inner plug 4 and the lid 5 and fitting the lid 5 to the inner plug 4 in the correct position as shown in Fig. 1, the second inner peripheral side engagement projection 45 is inserted between adjacent first outer peripheral side engagement projections 41 in the circumferential direction 9, and the second outer peripheral side engagement projection 46 is inserted between adjacent first inner peripheral side engagement projections 42 in the circumferential direction 9, as shown in Figs. 6 and 7, and the lid 5 is attached to the inner plug 4. When the plug is fitted, the second outer peripheral side engagement projection 46 is spaced from the protrusion 51 in the plugging direction S, so that resistance during plugging can be reduced.

[0040] When opening the unopened cap 1 after plugging, the lid 5 is rotated in the opening direction O as shown in Figure 8, so that the second inner circumference side engagement protrusion 45 engages with the first outer circumference side engagement protrusion 41, and the second outer circumference side engagement protrusion 46 engages with the first inner circumference side engagement protrusion 42, riding up onto the protrusion 51 and overlapping with the protrusion 51 in the radial direction 8.

[0041] 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 protrusion 45 and the first outer side engagement protrusion 41, and the second outer side engagement protrusion 46 and the first inner side engagement protrusion 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.

[0042] At this time, the cylindrical portion 19 of the detachable portion 14 is inserted between the inner retaining tube 32 and the outer retaining tube 33, and the convex portion 27 (see FIG. 2) of the detachable portion 14 fits into the concave portion 26 (see FIG. 4) of the outer retaining tube 33, so that the detachable portion 14 detached from the inside plug 4 is held between the inner retaining tube 32 and the outer retaining tube 33 of the lid 5. Also, as shown in FIG. 8, the second outer peripheral side engagement projection 46 overlaps with the protrusion 51 in the radial direction 8, so that the protrusion 51 of the detachable portion 14 fills the first gap 48 (see FIG. 7).

[0043] 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 protrusion 51 of the detachment part 14 fills the first gap 48 (see Fig. 7), so that even if it receives the impact of the drop, the cylindrical part 19 of the detachment part 14 is unlikely to bend inward 53 (see Figs. 1, 2, and 8) in the radial direction 8, and the protrusion 27 (see Fig. 2) of the detachment part 14 can be prevented from coming off from the recess 26 (see Fig. 4) of the outer holding tube 33. This makes it possible to prevent the detachment part 14 from falling off between the inner holding tube 32 of the lid 5 and the outer holding tube 33 due to the impact of the drop.

[0044] In the above embodiment, as shown in FIG. 2, 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 as shown in FIG. 4, 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. (Second embodiment)

[0045] In the first embodiment described above, the protrusions 51 filling the first gap 48 are provided on the cylindrical portion 19 of the detachment portion 14 as shown in Figures 7 and 8, but in the second embodiment described below, the protrusions 55 filling the second gap 49 are provided on the cylindrical portion 19 of the detachment portion 14 as shown in Figures 10 and 11. That is, the protrusions 55 protrude outward in the radial direction 8 from the outer circumferential surface of the cylindrical portion 19, and a plurality of protrusions (e.g., six protrusions) are formed at predetermined angular intervals (e.g., 60°) in the circumferential direction 9. The protrusions 55 are adjacent to the first outer circumferential engagement projection 41 in the plugging direction S.

[0046] When the lid 5 is fitted to the inner plug 4 in the correct position, the second inner engaging projection 45 is spaced apart from the protrusion 55 in the plugging direction S, as shown in Fig. 10. After fitting, the lid 5 of the unopened cap 1 is rotated in the unplugging direction O, and as shown in Fig. 11, when the second outer engaging projection 46 engages with the first inner engaging projection 42 in the unplugging direction O and the second inner engaging projection 45 engages with the first outer engaging projection 41 in the unplugging direction O, the second inner engaging projection 45 overlaps with the protrusion 55 in the radial direction 8. The operation of the above configuration will now be described.

[0047] When the lid 5 is fitted into the inner plug 4 in the correct position, as shown in Figure 10, the second inner engagement protrusion 45 is spaced away from the protrusion 55 in the plugging direction S, thereby reducing resistance when fitting the cap.

[0048] When opening the unopened cap 1 after plugging, by turning the lid 5 in the opening direction O, as shown in Fig. 11, the second inner circumference side engagement projection 45 engages with the first outer circumference side engagement projection 41 and rides up onto the protrusion 55 to overlap with the protrusion 55 in the radial direction 8, and the second outer circumference side engagement projection 46 engages with the first inner circumference side engagement projection 42. As a result, the protrusion 55 of the release portion 14 fills the second gap 49.

[0049] As described above, 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 onto a floor or the like in this closed state, as shown in Figure 11, the protrusion 55 of the detachment portion 14 fills the second gap 49 (see Figure 10), so that even if it receives the impact of the drop, the cylindrical portion 19 of the detachment portion 14 is less likely to bend outward 54 in the radial direction 8.

[0050] In the above-described second embodiment, the convex portion 27 of the engagement portion 25 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 root portion of the outer holding tube 33, but the convex portion 27 may be formed on the inner periphery of the tip portion of the cylindrical portion 19 of the detachment portion 14, and the concave portion 26 may be formed on the outer periphery of the root portion of the inner holding tube 32. Alternatively, the convex portion 27 may be formed on the outer periphery of the root portion of the inner holding tube 32, and the concave portion 26 may be formed on the inner periphery of the tip portion of the cylindrical portion 19 of the detachment portion 14.

[0051] In the first embodiment described above, as shown in FIG. 7, a protrusion 51 filling the first gap 48 is provided on the inner surface of the cylindrical portion 19 of the separation portion 14, and in the second embodiment described above, as shown in FIG. 10, a protrusion 55 filling the second gap 49 is provided on the outer surface of the cylindrical portion 19 of the separation portion 14, but both the protrusion 51 filling the first gap 48 and the protrusion 55 filling the second gap 49 may be provided on the inner and outer surfaces of the cylindrical portion 19. [Explanation of symbols]

[0052] 1 Cap 2 containers 4 Inner stopper 5 Lid 8 Radial 13 Weakened part 14 Detachment section 24 spout 25 Fitting part 26 Recess 27 Convex 32 Inner holding tube 33 Outer holding tube 41 First outer peripheral side engagement projection 42 First inner circumference side engagement projection 45 Second inner circumference side engagement protrusion 46 Second outer peripheral side engagement projection 48 First Gap 49 Second Gap 51,55 protrusion O Opening direction S Closing 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 engagement projection is formed on the outer periphery of the detachment portion, A first inner circumferential engaging projection is formed on the inner circumferential surface of the detachment portion, A second inner circumference side engagement projection is formed on the inner circumference of the outer holding cylinder, A second outer peripheral side engagement projection is formed on the outer periphery of the inner holding tube, a first gap is formed between the second outer circumferential engagement projection and an inner periphery of the detachment portion in the radial direction; a second gap is formed between the second inner circumferential engagement projection and an outer periphery of the detachment portion in the radial direction; A cap characterized in that when the lid is rotated in the opening direction, the second outer peripheral side engagement protrusion engages with the first inner peripheral side engagement protrusion in the opening direction and the second inner peripheral side engagement protrusion engages with the first outer peripheral side engagement protrusion in the opening direction, a protrusion is provided in the removal portion to fill at least one of the first gap and the second gap.

2. The engagement portion has a recess and a protrusion that fits into the recess, One of the protrusion and the recess is provided on the outer periphery of the release portion, and the other is provided on the inner periphery of the outer holding tube, The cap described in claim 1, characterized in that the protrusion protrudes radially inward from the inner circumference of the removal portion, and fills the first gap with the second outer circumference side engagement protrusion engaging with the first inner circumference side engagement protrusion in the opening direction and the second inner circumference side engagement protrusion engaging with the first outer circumference side engagement protrusion in the opening direction.

3. When the lid is attached to the inner plug by being screwed on, the second outer circumferential engagement projection is spaced from the protrusion in the plugging direction, A cap as described in claim 2, characterized in that when the lid rotates in the opening direction and the second outer peripheral side engagement projection engages with the first inner peripheral side engagement projection in the opening direction and the second inner peripheral side engagement projection engages with the first outer peripheral side engagement projection in the opening direction, the second outer peripheral side engagement projection overlaps with the protrusion in the radial direction.

Images