Cap engagement structure and container

Abstract

The objective of the present invention is to provide, for example, a cap engagement structure capable of suitably inhibiting the problem that a cap attached to a main body may become detached from the main body when subjected to an unintended external force. To this end, a cap engagement structure (K) is configured such that a cap (C) can be attached to and detached from a main body (A) by engaging and disengaging a cap-side engagement portion (t) and a main body-side engagement portion (g), wherein, with respect to a first imaginary line (L1) that connects a pair of edge portion points (e1, e2) that are farthest apart from one another along an opening edge (e) formed on a peripheral wall portion (8), an inclination angle (θ) of a second imaginary line (L2) that connects either one edge portion point (e1) of the pair of edge portion points (e1, e2) and an engagement point (r) between the cap-side engagement portion (t) farthest from said one edge portion point (e1) and the main body-side engagement portion (g) is set to 8° or more.

Description

Cap engagement structure and container

[0001] The present invention relates to a cap engagement structure and a container.

[0002] Conventionally, a cap engagement structure has been known which comprises a cap having one engaging protrusion on its inner peripheral surface and a main body having the other engaging protrusion on its outer peripheral surface, and which is configured so that the cap can be attached and detached from the main body by engaging and disengaging the one and the other engaging protrusions (see, for example, Patent Document 1).

[0003] Conventional caps tend to come off easily when subjected to unintended external force, such as when dropped or hit.

[0004] Japanese Patent Application Laid-Open No. 2019-030976

[0005] The present invention has been made with the above-mentioned circumstances in mind, and aims to provide a cap engagement structure and a container that can at least effectively prevent the problem of a cap attached to a main body coming off the main body when subjected to an unintended external force.

[0006] That is, the present invention has the following configuration.

[0007] The invention described in claim 1 is a cap engagement structure comprising a cap having a cap side engagement portion that is continuous in the circumferential direction on the inner surface of a cylindrical peripheral wall portion, and a main body having a storage portion inside which an item is stored and a main body side engagement portion on the outer surface with which the cap side engagement portion engages, wherein the cap is detachable from the main body by engaging and disengaging the cap side engagement portion with the main body side engagement portion, and wherein the inclination angle of a second virtual line connecting one of the pair of edge points and the engagement point between the cap side engagement portion and the main body side engagement portion that is furthest from the one edge point is set to 8° or more with respect to a first virtual line connecting a pair of edge points that are furthest apart among the opening edges formed on the peripheral wall portion.

[0008] The invention described in claim 2 is a cap engagement structure described in claim 1, in which the cap side engagement portion has a shape that protrudes inward and the main body side engagement portion has a shape that protrudes outward.

[0009] The invention described in claim 3 is a cap engagement structure described in claim 1, in which the main body has an inner wall portion that is rectangular or cylindrical and has an inner surface facing the storage portion, and a side wall portion that is cylindrical and surrounds the outside of the inner wall portion, and the main body side engagement portion is provided on the side wall portion.

[0010] The invention described in claim 4 is a cap engagement structure described in claim 3, in which the side wall portion is configured to be elastically deformable toward the inner wall portion when the cap is attached or detached from the main body.

[0011] The invention described in claim 5 is a cap engagement structure described in claim 3, in which a butting portion is arranged on the outside of the side wall portion of the main body, against which the opening edge of the cap is butted when the cap is attached.

[0012] The invention described in claim 6 is a cap engagement structure described in claim 3, in which the main body is cylindrical and has a main body base having an outer peripheral surface that is exposed to the outside even when the cap is attached, and the inner wall portion and the side wall portion extend in the axial direction from the main body base.

[0013] The invention described in claim 7 is a cap engagement structure described in claim 1, in which a flange portion is protruded on the side opposite the opening edge of the cap, and the protruding dimension of the flange portion is set to a dimension smaller than the thickness dimension of the peripheral wall portion.

[0014] An eighth aspect of the present invention is a container provided with the cap engagement structure according to any one of the first to seventh aspects.

[0015] A ninth aspect of the present invention is the container according to the eighth aspect, wherein the article is a coated material such as glue.

[0016] As described above, according to the present invention, it is possible to provide a cap engagement structure and a container that can at least effectively prevent the problem that a cap attached to a main body may come off the main body when subjected to an unintended external force.

[0017] 1 is a front view showing one embodiment of the present invention. 2 is a plan view of the same embodiment. 3 is a bottom view of the same embodiment. 4 is a cross-sectional view taken along line X-X in FIG. 2. 5 is an exploded front view of the same embodiment. 6 is an exploded perspective view of the same embodiment. 7 is a central cross-sectional view of the cap in the same embodiment. 8 is a central cross-sectional view of the tip of the main body in the same embodiment. 9 is a partial enlarged view of FIG. 10. 10 is a front view showing Example 1 and Comparative Example 1 side by side. 11 is a table showing the test contents and test results in comparison with a conventional example. 12 is a table showing the test contents and test results in comparison with a conventional example. 13 is a table showing the test contents and test results in comparison with a conventional example. 14 is a table showing the test contents and test results in comparison with a conventional example.

[0018] An embodiment of the present invention will now be described with reference to FIGS.

[0019] In this embodiment, the cap engagement structure K and the container Y of the present invention are applied to an application product such as stick glue.

[0020] The application product includes a container Y composed of a body A and a cap C, and an application object N (glue) contained in the container Y.

[0021] <<Container Y>> The container Y comprises a main body A having a storage section s formed therein in which a rectangular prism-shaped application material N is stored and an extrusion mechanism P for extruding the application material N, and a cap C which is cylindrical in shape with a bottom overall and can be attached and detached to the main body A.

[0022] In this embodiment, the container Y is provided with a cap engagement structure K that allows the cap C to be attached and detached to the main body A by engaging and disengaging the cap side engagement portion t provided on the cap C with the main body side engagement portion g provided on the main body A.

[0023] <Main body A> The main body A has a storage section s inside which the application material N is stored. A main body side engaging section g that continues in the circumferential direction is provided on the outer surface side of the main body A. More specifically, the main body side engaging section g is provided to protrude from the outer surface side of the side wall section 3 that constitutes the main body A.

[0024] The main body A comprises a main body base 1 which is cylindrical and has an outer peripheral surface mg which serves as the user's gripping portion and is exposed to the outside even when the cap C is attached; an inner wall portion 2 which is rectangular cylindrical and extends integrally from the tip of the main body base 1 in the direction of opening of the storage portion s, and has an inner surface mn which faces the storage portion s; and a side wall portion 3 which is cylindrical and extends integrally from the tip of the main body base 1, and surrounds the outside of the inner wall portion 2.

[0025] The main body A in this embodiment is provided with an extrusion mechanism P for extruding the application material N. The extrusion mechanism P includes an operating unit 6 disposed at the rear of the main body base 1 so as to be rotatable about an axis js.

[0026] [Main Body Base 1] The main body base 1 has an inner surface ma facing the storage section s. The main body base 1 is formed so that the cross-sectional shape gradually changes smoothly from the base end side to the tip end side.

[0027] The base end (i.e., rear end) of the main body base 1 has a generally rectangular columnar appearance with rounded corners, while the tip end (i.e., front end) has a generally cylindrical appearance. The outer peripheral surface mg of the main body base 1 is smooth and continuous from the tip end to the base end.

[0028] The outer periphery of the tip of the main body base 1 is provided with a butting portion mt, which has an annular shape when viewed from the direction of the axis js and against which the opening edge e of the cap C is butted when the cap C is attached. The butting portion mt is provided outside the side wall portion 3, i.e., on the anti-axial side.

[0029] The butting portion mt is configured by an end face facing the axis js, i.e., the opening direction of the storage portion s. In other words, the butting portion mt forms a step d between the outer peripheral surface mg of the main body base 1 and the side wall portion 3.

[0030] [Inner wall portion 2] The inner wall portion 2 is a rectangular cylindrical portion. The inner wall portion 2 extends integrally in the direction of the axis js from one longitudinal end, i.e., the tip, of the main body base 1. The inner surface mn of the inner wall portion 2 facing the storage portion s and the inner surface ma of the main body base 1 facing the storage portion s are flush and continuous.

[0031] [Side Wall 3] The side wall 3 extends integrally from the tip, which is one longitudinal end of the main body base 1, in the direction of the axis js. The side wall 3 is cylindrical as a whole. The side wall 3 is configured to be temporarily elastically deformable toward the inner wall 2 based on the material properties when the cap C is attached to or detached from the main body A.

[0032] The thickness of the side wall portion 3 is set to gradually decrease from the base end side toward the tip end side.

[0033] The main body side engaging portion g, which is integrally formed with the side wall portion 3, has an outer surface gh that is partially arcuate in cross section. The main body side engaging portion g is formed to be convex outward. The main body side engaging portion g formed on the side wall portion 3 has a shape that protrudes outward. In other words, the main body side engaging portion g is rib-shaped.

[0034] As shown in Figure 5, the extension dimension w3 of the portion 3a of the side wall portion 3 that is closer to the base end than the main body side engaging portion g is set to be three or more times longer than the extension dimension w4 of the portion 3b of the side wall portion 3 that is closer to the tip end than the main body engaging portion g.

[0035] In addition, the extension dimension w3 of the portion 3a of the side wall portion 3 that is closer to the base end than the main body side engagement portion g is set to a value that is at least one-fourth the separation dimension w5 between the pair of side wall portion points 3t that are the furthest apart.

[0036] [Extrusion Mechanism P] The extrusion mechanism P is for extruding the application material N contained in the container s forward along the axis js.

[0037] The extrusion mechanism P is configured to include a base shaft 4 held by a bearing 11 provided at the base end of the main body base 1, a threaded rod 5 extending into the storage section s from a center of the base shaft 4 coinciding with the axis js, an operating unit 6 provided at the rear end of the base shaft 4, and an advancing / retracting member 7 disposed in the storage section s while being threadedly attached to the threaded rod 5, and which threadably advances and retreats as the threaded rod 5 rotates. The application material N has a rectangular columnar shape that matches the shape of the storage section s, and is held by the advancing / retracting member 7.

[0038] The operation unit 6 includes an operation unit main body 61 including a rectangular cylindrical peripheral wall portion, and an operation unit cover 62 that covers a cavity and an opening formed in the operation unit main body 61. An outer peripheral surface 61m of the operation unit main body 61 is configured to smoothly continue to the outer peripheral surface mg of the rear end portion of the main body base 1.

[0039] <Cap C> The cap C is attached to the main body A by fitting it onto the outside of the main body A. When attached to the main body A, the cap C can prevent the application matter N from drying out when not in use and prevent dust and other particles from adhering to the application matter N.

[0040] When the cap C is attached to the main body A, the opening edge e abuts against the butting portion mt of the main body base 1, thereby positioning the cap C in the direction of the axis js relative to the main body A. When the cap C is attached to the main body A, the cap side engaging portion t engages with the main body side engaging portion g.

[0041] The cap C includes a cylindrical peripheral wall portion 8 and a generally disk-shaped bottom wall portion 9 that serves as a closing portion that closes one side of the peripheral wall portion 8 .

[0042] The peripheral wall 8 is cylindrical. The peripheral wall 8 has a continuous annular opening edge e at the tip of the open side. The thickness of the peripheral wall 8 is set to gradually decrease from the base end side (bottom wall 9 side) toward the tip side (open side). The inner surface of the peripheral wall 8 has a cap side engagement portion t that continues in the circumferential direction. The outer peripheral surface 8m of the peripheral wall 8 smoothly continues with the outer peripheral surface mg of the main body base 1 when the cap C is attached to the main body A.

[0043] In this embodiment, the opening edge e of the peripheral wall portion 8 refers to an edge that can act as a fulcrum for rotating the cap C in cooperation with the butt portion mt of the main body 1 when an external force is applied to the cap C from a direction intersecting the axis js (for example, a lateral direction).

[0044] The cap side engaging portion t has an outer surface th that is partially arc-shaped in cross section. The cap side engaging portion t is provided so as to be convex inward. The cap side engaging portion t provided on the peripheral wall portion 8 has a shape that protrudes inward. In other words, the cap side engaging portion t is rib-shaped.

[0045] As shown in Figure 7, the extension dimension w6 of the portion 8a of the peripheral wall portion 8 that is further toward the tip side than the cap side engagement portion t is set to a value that is at least one-fifth of the separation dimension w7 between the pair of edge points e1 and e2 that are the furthest apart.

[0046] A flange F is provided so as to protrude continuously in the circumferential direction on the side opposite the opening edge of the cap C. The flange F is intended to make it easier for the user's fingers to catch when removing the cap C from the main body A.

[0047] In this embodiment, the outward protrusion dimension w1 of the flange F is set to be smaller than the wall thickness dimension w2 of the portion 8n of the peripheral wall 8 located in the vicinity of the flange F.

[0048] <<Application Material N>> The application material N has a rectangular cross section and is stored in the storage section s of the main body A. In this embodiment, the application material N is a solid glue. Note that the application material N is not limited to glue, and may be any material that can be applied. Other application material N may include, for example, a writing core or cosmetics.

[0049] <<Cap Engagement Structure K>> The cap engagement structure K applied to the container Y in this embodiment will be described.

[0050] As shown in Figure 9, in the cap engagement structure K, the inclination angle Θ of a straight-line second virtual line L2 connecting one edge point e1 of the pair of edge points e1, e2 and the engagement point r between the cap side engagement portion t and the body side engagement portion g that is furthest from the one edge point e1 is set to be 8° or more with respect to a straight-line first virtual line L1 connecting a pair of edge points e1, e2 that are the furthest apart among the opening edges e formed on the peripheral wall portion 8 of the cap C.

[0051] The first imaginary line L1 is a straight line extending in a direction perpendicular to the axis js (center line). The first imaginary line L1 intersects with the axis js midway between one edge point e1 and the other edge point e2.

[0052] The second imaginary line L2 extends linearly and intersects with the axis js midway between the one edge point e1 and the engagement point r.

[0053] The inclination angle Θ of the second imaginary line L2 with respect to the first imaginary line L1 for realizing the cap engagement structure K is preferably set to be 8° or more and 45° or less.

[0054] If the inclination angle Θ is smaller than 8°, when an unintended external force acts on the cap C due to a fall or collision, and the cap C attempts to rotate relative to the main body A with one edge point e1 as a fulcrum, the engagement of the cap side engagement portion t with the main body side engagement portion g is likely to be released.

[0055] In other words, if the inclination angle Θ is smaller than 8°, the cap C will be extremely likely to come off from the main body A if an unintended external force is applied to the cap C due to a fall or collision.

[0056] On the other hand, if the inclination angle Θ is greater than 45°, when an unintended external force due to a fall or collision acts on the cap C, causing the cap C to rotate relative to the main body A around one edge point e1 as a fulcrum, it will be difficult for the cap-side engaging portion t to disengage from the main body-side engaging portion g. However, on the other hand, the dimension of the cap C in the direction of the axis js will inevitably become excessively long, which will significantly reduce the freedom to realize a compact design that contributes to good design and the rationality of the quantity of resin material required for molding.

[0057] If the inclination angle Θ is set to a value between 10° and 30°, the above-mentioned problems can be more effectively prevented.

[0058] Furthermore, by setting the inclination angle Θ to a value greater than or equal to 14° and less than or equal to 16°, a configuration that contributes to reducing the tendency of the cap C to come off the main body A as described above and a configuration that contributes to the appropriate design of the cap C as described above can be effectively achieved.

[0059] In this embodiment, the specific inclination angle Θ of the second imaginary line L2 with respect to the first imaginary line L1 for realizing the cap engagement structure K is set to 15°.

[0060] <<Disclosure of Test Results>> Next, Tests 1 to 4 using Example 1, which is an application product using a container Y to which the cap engagement structure K of this embodiment is applied, and Comparative Example 1, which is an application product using a container Yx to which the conventional cap engagement structure Kx is applied, will be described with reference to Figures 10 to 14. Note that the reference numeral assigned to Comparative Example 1 in Figure 10 is the reference numeral assigned to Example 1 with an "x" added.

[0061] Example 1 is shown on the left side of Fig. 10 and is similar to the configurations shown in Figs. 1 to 9. In the cap engagement structure K of Example 1, the inclination angle Θ of the second imaginary line L2 relative to the first imaginary line L1 is set to "15°." Furthermore, the flange portion F of the cap C of Example 1 has a protruding dimension w1 outward from the peripheral wall portion 3 set to "0.45 mm."

[0062] Comparative Example 1 is shown on the right side of Fig. 10. In the cap engagement structure Kx of Comparative Example 1, the inclination angle Θx of the second imaginary line L2x relative to the first imaginary line L1x is set to "7.5°." Furthermore, the flange portion Fx of the cap Cx of Comparative Example 1 has an outward protrusion dimension w1x from the peripheral wall portion 3x set to "1.5 mm."

[0063] <About Test 1 (Fig. 11)> Test name: Applied product pressing test Purpose: To confirm the fit of the cap to the main body Test method: Constant load pressing Conditions: Room temperature, no individual product packaging Test summary: With the containers Y and Yx lying on their sides on an office desk surface, a load of 3 kg was applied to the outer periphery of the main body bases 1 and 1x of the main bodies A and Ax. Test results: In Example 1, the cap C did not come off the main body A, but in Comparative Example 1, the cap Cx came off the main body Ax.

[0064] <Regarding Test 2 (FIG. 12)> Test name: Drop test of coated product Purpose: To confirm the fit of the cap to the main body Test method: Product dropped using a drop tester Conditions: Room temperature, product individually packaged Test summary: Containers Y and Yx were dropped from a height of 70 cm onto an office floor with 1 left side, 2 right side, 3 back, 4 front, 5 flat surface (top), and 6 bottom (bottom) facing downwards. Test results: In Example 1, the cap C did not come off the main body A when dropped in any of the positions 1 to 6, but in Comparative Example 1, the cap C became slightly open relative to the main body A when dropped in any of the positions 1 to 4.

[0065] <About Test 3 (FIG. 13)> Test name: Coated product transportation (air transport) test Purpose: To confirm the fit of the cap to the main body Test method: Air transport from Mumbai (India) to Osaka (Japan) Test overview: 20 inner boxes (Nos. 1 to 20) containing 10 containers Y and Yx were prepared, and the inner boxes were housed in the outer box and transported by air. Within the outer box, 10 of the 20 inner boxes (Nos. 11 to 20) were placed on the lower level, and the other 10 boxes (Nos. 1 to 10) were placed on the upper level. Test results: In Example 1, cap C did not come off from main body A, but in Comparative Example 1, cap Cx came off from main body Ax in 10 pieces (10% of the total quantity).

[0066] <About Test 4 (Figure 14)> Test name: Applied product transportation (vehicle transportation) test Purpose: To confirm the fit of the cap to the body Test method: Round-trip transportation by vehicle between Osaka and Sendai Test overview: Twelve inner boxes (Nos. 1 to 12) containing 20 containers Y and Yx were prepared, and these were then placed in an outer box and transported by vehicle. Within the outer box, of the 12 inner boxes, six boxes (Nos. 7 to 12) were placed on the lower level, and the other six boxes (Nos. 1 to 6) were placed on the upper level. Test results: In Example 1, the cap C did not come off from the body A, but in Comparative Example 1, the cap C came off from the body Ax in 14 cases (5.8% of the total number).

[0067] As described above, the cap engagement structure K of this embodiment comprises a cap C having a cap side engagement portion t that is continuous in the circumferential direction on the inner surface side of a cylindrical peripheral wall portion 8, and a main body A having a storage portion s inside which an article, i.e., a coating material N, is stored, and having a main body side engagement portion g on the outer surface with which the cap side engagement portion t engages, and is configured so that the cap C can be attached and detached to the main body A by engaging and disengaging the cap side engagement portion t and the main body side engagement portion g.

[0068] The cap engagement structure K has a second imaginary line L2 connecting one of the pair of edge points e1, e2 and the engagement point r between the cap side engagement portion t and the body side engagement portion g that is furthest from the one edge point e1, e2, with respect to a first imaginary line L1 connecting the pair of edge points e1, e2 that are the furthest apart among the opening edges e formed on the peripheral wall portion 8, the inclination angle Θ being set to 8° or more.

[0069] Therefore, this embodiment can provide a cap engagement structure K that can effectively prevent the problem of the cap C attached to the main body A coming off the main body A when it is subjected to an unintended external force.

[0070] In other words, if the container Y unexpectedly falls onto the floor or collides with another structure, the cap C may be subjected to an unexpected external force from the floor or structure.

[0071] In particular, when the cap C attached to the main body A is subjected to an external force from a direction intersecting the axis js, the cap C becomes prone to rotate relative to the main body A with one edge point e1 as the fulcrum.

[0072] In this case, in the cap engagement structure K of this embodiment, the inclination angle Θ of the second virtual line L2 relative to the first virtual line L1 is set to 8° or more, so that at the engagement point r between the cap side engagement portion t and the main body side engagement portion g, which is the farthest from one edge point e1, which is the fulcrum, and its vicinity, the cap side engagement portion t acts to push the main body side engagement portion g and the side wall portion 3 inward, i.e., toward the axis js.

[0073] As a result, the cap side engagement portion t located at the engagement point r and its vicinity moves in a direction that makes it difficult to disengage from the main body side engagement portion g, thereby effectively eliminating the problem of the cap C easily coming off the main body A.

[0074] The cap side engaging portion t is shaped to protrude inward, and the main body side engaging portion g is shaped to protrude outward.

[0075] Therefore, the cap side engaging portion t and the main body side engaging portion g are configured to be able to be engaged and disengaged suitably.

[0076] The main body A has an inner wall portion 2 that is rectangular and has an inner surface mn facing the storage portion s, and a side wall portion 3 that is cylindrical and surrounds the outside of the inner wall portion 2, and the main body side engagement portion g is provided on the side wall portion 3.

[0077] For this reason, since the main body side engaging portion g is provided on the side wall portion 3 which is a separate part from the inner wall portion 2, it has excellent design freedom, allowing for flexible setting of a predetermined degree of elastic deformation when engaging and disengaging with the cap side engaging portion t.

[0078] The side wall portion 3 is configured so as to be elastically deformable toward the inner wall portion 2 when the cap C is attached to or detached from the main body A.

[0079] Therefore, by setting the degree of elastic deformation of the side wall portion 3, which can elastically deform toward the inner wall portion 2, the degree of engagement between the cap side engaging portion t and the main body side engaging portion g can be flexibly adjusted.

[0080] On the outer side of the side wall portion 3 of the main body A, there is provided a butting portion mt against which the opening edge e of the cap C butts when the cap C is attached.

[0081] Therefore, the abutting portion mt and the opening edge e of the cap C are abutted against each other, so that the cap C can suitably close the storage portion s.

[0082] The main body A is cylindrical and has a main body base 1 with an outer surface mg that is exposed to the outside even when the cap C is attached, and an inner wall portion 2 and a side wall portion 3 extend from the main body base 1 in the direction of the axis js.

[0083] For this reason, the main body A not only has an outer peripheral surface mg suitably provided on the main body base 1 as the user's gripping area, but also has a suitable configuration with a reduced number of parts.

[0084] A flange F is provided on the opposite side of the opening edge of the cap C, and a protruding dimension w1 of the flange F is set to be smaller than a thickness dimension w2 of the peripheral wall 8.

[0085] That is, the cap C has a minimized protrusion of the flange F. The flange F of this embodiment allows the user's finger to be easily hooked onto the cap C, and is less likely to rotate the cap C around one edge point e1 even when subjected to an unexpected external force such as a drop or collision, which helps to prevent the cap C from becoming detached from the main body A.

[0086] The container Y is provided with a cap engagement structure K, and is configured to suitably suppress the problem that the cap C attached to the main body A may come off from the main body A when subjected to an unintended external force.

[0087] Since the container Y stores a coating material N such as glue in the storage section s, the configuration in which the cap engagement structure K is applied can effectively prevent the cap C from unintentionally coming off the main body A, causing the coating material N such as glue to dry out.

[0088] The present invention is not limited to the above-described embodiment.

[0089] It goes without saying that the inclination angle can be set appropriately within the scope of the present invention.

[0090] The cap need only have a cap-side engaging portion that is continuous in the circumferential direction on the inner surface of the cylindrical peripheral wall portion, and is not limited to the configuration shown in the above-mentioned embodiment.

[0091] The main body is not limited to the configuration shown in the above-described embodiment as long as it has a storage section for storing articles therein and a main body engaging section on the outer surface with which the cap engaging section engages, and for example, the main body may have a configuration that does not include a push-out mechanism.

[0092] The storage section of the main body may be configured so that no articles are previously placed therein.

[0093] The cap engagement structure does not have to have both the cap-side engagement portion and the main body-side engagement portion protruding. That is, the cap engagement structure may have either the cap-side engagement portion or the main body-side engagement portion protruding and the other concave.

[0094] Furthermore, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible within the scope of the present invention.

[0095] Y: container A: main body C: cap K: cap engagement structure t: cap side engagement portion 8: peripheral wall portion N: application object (article) s: storage portion g: main body side engagement portion e1: one edge portion (pair of edge portions) e2: other edge portion (pair of edge portions) L1: first imaginary line L2: second imaginary line Θ: inclination angle

Claims

1. A cap engagement structure comprising a cap having a cap-side engagement portion that is continuous in the circumferential direction on the inner surface of a cylindrical peripheral wall portion, and a main body having a storage portion for storing items inside and a main body-side engagement portion on the outer surface with which the cap-side engagement portion engages, wherein the cap can be attached to and detached from the main body by engaging and disengaging the cap-side engagement portion with the main body-side engagement portion, and wherein the inclination angle of a second imaginary line connecting one of the pair of edge points and the engagement point between the cap-side engagement portion and the main body-side engagement portion that is furthest from the one edge point is set to 8° or more with respect to a first imaginary line connecting a pair of edge points that are furthest apart on the opening edges formed on the peripheral wall portion.

2. A cap engagement structure as set forth in claim 1, wherein the cap side engagement portion is shaped to protrude inward, and the body side engagement portion is shaped to protrude outward.

3. A cap engagement structure as described in claim 1, wherein the main body comprises an inner wall portion having a rectangular or cylindrical shape and an inner surface facing the storage portion, and a side wall portion having a cylindrical shape and surrounding the outside of the inner wall portion, and the main body side engagement portion is provided on the side wall portion.

4. A cap engagement structure according to claim 3, wherein said side wall portion is configured to be elastically deformable toward said inner wall portion when said cap is attached to or detached from said main body.

5. A cap engagement structure according to claim 3, wherein abutting portions are provided on the outside of the side walls of the main body, against which the opening edge of the cap butts when the cap is attached.

6. A cap engagement structure as described in claim 3, wherein the main body is cylindrical and has a main body base with an outer peripheral surface that is exposed to the outside even when the cap is attached, and the inner wall portion and the side wall portion extend axially from the main body base.

7. A cap engagement structure as claimed in claim 1, wherein a flange is provided on the opposite edge of the cap from the opening, and the projection dimension of the flange is set to a dimension smaller than the thickness dimension of the peripheral wall portion.

8. A container provided with a cap engagement structure according to any one of claims 1 to 7.

9. The container according to claim 8, wherein the article is a coating such as glue.

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