JP7349336B2 - resin container - Google Patents

Description

The present invention relates to a resin container that closes a container body by screwing the container body and an outer lid together.

Among resin containers in which a container body and an outer lid are screwed together, there are known resin containers in which the container body has two engaging parts and the outer lid has one engaged part (for example, the patent (See Reference 1). In such a resin container, when the outer lid rotates in the direction of screwing into the container body, the engaged part enters between the two engaging parts, thereby preventing the screwing of the outer lid and the container body. Complete.

Japanese Patent Application Publication No. 2013-199296

In this way, the movement of the outer lid in the screwing direction involves inserting the engaged part between the front-stage engaging part and the rear-stage engaging part, and thereby screwing the outer lid and the container body together. complete it. The fact that the engaged part overcomes the preceding engaging part provides the user with a feeling of screwing together due to sound, vibration, etc. The user who is provided with the screwing feeling recognizes that the screwing of the container body and the outer lid is progressing appropriately. In order to provide such a feeling of screwing, the screwing gap, which is the distance between the outer circumferential surface of the container body and the inner circumferential surface of the outer lid, must be large enough for the engaged portion to overcome the preceding engaging portion. .

On the other hand, in a resin container whose contents are heated in a microwave oven, thermal contraction occurs each time the contents are heated, and thermal contraction accumulates with repeated heating. For example, if the amount of contraction differs between the container body and the outer lid, such as when only the container body is heated or only the lid is heated, in a closed resin container, A change occurs in the screw clearance. Then, an increase in the screwing gap or a reduction in the screwing gap makes it impossible to overcome the above-mentioned problems, and reduces the feeling of screwing.

An object of the present invention is to provide a resin container that can suppress the feeling of screwing together.

A resin container that solves the above problems includes a container body having a cylindrical opening, and a screw-type outer lid having an inner circumferential surface that screws into the outer circumferential surface of the opening. Either one of the outer circumferential surface and the inner circumferential surface is the first part. The portion of the outer peripheral surface and the inner peripheral surface other than the first portion is a second portion. The first portion includes a plurality of first protrusions that protrude toward the second portion, and the second portion includes second protrusions that protrude toward the first portion. The direction in which the second protrusion advances when the screw-type outer lid is screwed together is the screwing direction. The plurality of first protrusions are arranged in the circumferential direction of the first part such that the distance between each of the first protrusions and the second part becomes smaller in the screwing direction. The second protrusion is configured to pass through the plurality of first protrusions, come into contact with at least one of the first protrusions, and ride over the first protrusion before the screwing is completed.

According to the above configuration, when the amount of heat shrinkage of the container body is larger than the amount of heat shrinkage of the screw-type outer lid, the distance between the first part and the second part becomes large. On the other hand, when the amount of heat shrinkage of the container body is smaller than the amount of heat shrinkage of the screw-type outer lid, the distance between the first part and the second part becomes small. Even when the screwing of the container body and the screw-type outer lid is completed, the distance between the first protrusion and the second portion changes depending on the amount of thermal contraction of each member.

Here, in the above-mentioned configuration, the second protrusion passes through the plurality of first protrusions when the screw-type outer cover is screwed together, and as the screw engagement progresses, one of the first protrusions comes into contact with the second protrusion. It becomes easier. The plurality of first protrusions are lined up so that the second protrusion rides over at least one first protrusion. As a result, whether the distance between the first part and the second part is small or the distance between the first part and the second part is large, when the second protrusion overcomes any of the first protrusions, A sense of screw engagement is provided.

In the resin container, the first part may be an outer circumferential surface of the opening, and the second part may be an inner circumferential surface of the screw-type outer lid. According to this configuration, whether the distance between the opening and the screw-type outer cover is small or the distance between the opening and the screw-type outer cover is large, the second protrusion can overcome any of the first protrusions. Sometimes, a sense of engagement is provided.

In the resin container, the second protrusion may be longer than the first protrusion in the vertical direction.
As the screw-type outer cover progresses, the second protrusion located on the screw-type outer cover displaces downward as well as in the circumferential direction. In this regard, if the length of the second protrusion in the vertical direction is larger than the first protrusion, the second protrusion, which is longer in the vertical direction, will be displaced downward as the screw-type outer lid is screwed together. As a result, compared to a configuration in which the length of the second protrusion in the vertical direction is short, the second protrusion passes through the plurality of first protrusions before the screwing is completed, and at least one first protrusion and the second protrusion It becomes easy for the first projection to come into contact with the first projection and to get over the first projection.

In the resin container, the plurality of first protrusions are a first protrusion group, the first part includes the plurality of first protrusion groups equally distributed in the circumferential direction, and the second part is , a plurality of second protrusions may be provided that are equally distributed in the circumferential direction and have the same number as the first group of protrusions.

According to the above configuration, it is possible to match the timing at which the second protrusion passes over the first protrusion, that is, the timing at which the screwing feeling is provided, in the plurality of second protrusions. This makes it possible to superimpose and strengthen the screwing feeling caused by each second protrusion overcoming the first protrusion.

In the above resin container, the first part includes a plurality of first screw threads equally distributed in the circumferential direction, and the second part includes a plurality of first thread threads equally distributed in the circumferential direction and having the same number as the first screw threads. A plurality of second screw threads may be provided, one of the first protrusion groups may be located on each of the first thread threads, and one second protrusion may be located on each of the second thread threads. .

According to the above configuration, when the first threaded thread and the second threaded thread are threaded together, the threaded engagement between the container body and the threaded outer cover is completed. Since one first protrusion group is located on each first screw thread, and one second protrusion is located on each second thread thread, the timing at which each second protrusion gets over the first protrusion, and each It is easy to match the timing before the second thread thread and the first thread thread are completely screwed together. That is, it is easy to match the timing at which the screwing feeling is provided and the progress of the screwing so that the timing at which the screwing feeling is provided is before the completion of the screwing.

In the resin container, the interval between the first protrusions adjacent to each other in the circumferential direction may be such that the second protrusion located at the interval can be moved in the circumferential direction.
The temperature at which the container body and the screw-type outer lid are heated varies depending on the environment in which the resin container is used. The amount of heat shrinkage of the container body and the amount of heat shrinkage of the screw-type outer lid also vary. As a result, when the container body and the screw-type outer lid are completely screwed together, the relative positions of the first protrusion group and the second protrusion vary depending on the environment in which the resin container is used. Here, as described in the above-mentioned conventional example, the engaged part is inserted between the former engaging part and the latter engaging part, thereby screwing the container body and the screw-type outer lid together. In the configuration where the coupling is completed, the threaded engagement between the container body and the screw-type outer cover is forcibly stopped even though the threaded engagement between the container body and the screw-type outer cover is not actually completed. . In this regard, according to the resin container described above, since the second protrusions are movable in the circumferential direction at intervals of the first protrusions that are adjacent to each other in the circumferential direction, the screwing that should originally proceed is not stopped in the middle. suppressed.

FIG. 1 is an exploded perspective view showing a perspective structure of an embodiment of a resin container. FIG. 1 is a cross-sectional view showing a cross-sectional structure of an embodiment of a resin container. The bottom view which shows the bottom structure of the container main body in one Embodiment of a resin container. FIG. 6 is a partially enlarged cross-sectional view in a state where the first projection group and the lid-side projection are in contact with each other. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 2 is an action diagram showing the action of an embodiment of a resin container. FIG. 7 is an enlarged cross-sectional view showing the structure of the first protrusion group and the lid side protrusion in Modification Example 1. FIG. 7 is an enlarged cross-sectional view showing the structure of the first protrusion group and the lid side protrusion in Modification Example 2. FIG. 7 is an enlarged cross-sectional view showing the structure of the first protrusion group and the lid side protrusion in Modification Example 3. FIG. 7 is an enlarged cross-sectional view showing the structure of the first protrusion group and the lid side protrusion in Modification Example 4.

[Resin container]
One embodiment of a resin container will be described with reference to FIGS. 1 to 12.
First, the structure of the resin container will be explained with reference to FIGS. 1 to 3. Next, with reference to FIGS. 4 to 8, a description will be given of screwing when the amount of heat shrinkage of the container body is larger than the amount of heat shrinkage of the screw-type outer lid. Next, with reference to FIGS. 9 and 10, a description will be given of a case in which the amount of heat shrinkage of the screw-type outer lid and the amount of heat shrinkage of the container body are approximately equal, and with reference to FIGS. A description will be given of screwing when the amount of heat shrinkage of the outer lid is larger than the amount of heat shrinkage of the container body.

As shown in FIG. 1, the resin container 10 includes a container body 20 having a cylindrical shape with a bottom and a screw-type outer lid 50 having a cylindrical shape with a lid. The container body 20 includes a container threaded portion 25 . The screw-type outer lid 50 is configured to be screwable with the container screw portion 25.

The material constituting the resin container 10 is a resin that undergoes thermal contraction when heated, and is, for example, a crystalline resin or an amorphous resin. The crystalline resin is, for example, one selected from the group consisting of polyethylene, polypropylene, and polyethylene terephthalate. The amorphous resin is, for example, polystyrene. The material constituting the container body 20 and the material constituting the screw-type outer lid 50 may be the same or different.

The resin container 10 has a heat-resistant temperature of, for example, 140° C. or lower, and is configured such that the contents can be heated in a microwave oven. By repeatedly heating the resin container 10 in a microwave oven, the resin container 10 causes thermal contraction each time it is heated, and the thermal contraction accumulates as the heating is repeated. In addition, from the viewpoint of obtaining flexibility of the resin container 10, the material constituting the resin container 10 is preferably a crystalline resin.

In the resin container 10, since the amount of heat shrinkage of the container body 20 and the amount of heat shrinkage of the screw-type outer lid 50 are different from each other, the difference between the outer circumferential surface of the container body 20 and the inner circumferential surface of the screw-type outer cover 50 is The threading gap HA, which is a distance, changes. For example, when the amount of heat shrinkage of the container body 20 is larger than the amount of heat shrinkage of the screw-type outer lid 50, the threaded gap HA is large, and the amount of heat shrinkage of the container body 20 and the amount of heat shrinkage of the screw-type outer lid 50 are larger. When they are equal to each other, the screw engagement gap HA is small. Further, when the amount of heat shrinkage of the screw-type outer lid 50 is larger than the amount of heat shrinkage of the container body 20, the screw gap HA is even smaller.

[Container body]
The container body 20 includes a peripheral wall portion 22 having a cylindrical shape and a container bottom wall portion 40 having a polygonal plate shape. The peripheral wall portion 22 and the container bottom wall portion 40 define a housing portion 21 having a concave shape. The storage section 21 stores contents such as foodstuffs. In the resin container 10, the side of the screw-type outer lid 50 with respect to the container body 20 is also referred to as the upper side, and the side of the container body 20 with respect to the screw-type outer lid 50 is also referred to as the lower side.

The peripheral wall portion 22 includes an opening 23 that is a wall having a cylindrical shape, and a container screw portion 25 is located on the outer peripheral surface of the opening 23 . The opening 23 includes a top surface 24 that is the upper end surface of the container body 20. The container threaded portion 25 includes one container-side threaded peripheral wall 26 having a cylindrical shape, and six container threads 27 that are an example of first threads. Each container thread 27 is a protrusion that projects outward in the radial direction of the container side screw peripheral wall 26 on the outer circumferential surface of the container side screw peripheral wall 26 . The six container screw threads 27 are equally distributed along the circumferential direction of the container-side screw peripheral wall 26 such that the end portions of adjacent container thread threads 27 overlap in the vertical direction.

The number of container screw threads 27 is not limited to six, but may be one or more. In addition, when completing the screw connection between the container body 20 and the screw-type outer lid 50, the larger the number of container screw threads 27, the smaller the rotation angle of the screw-type outer lid 50. For example, if the number of container screw threads 27 is two, the rotation angle of the screw-type outer cover 50 is about 180° to complete the screwing together of the container body 20 and the screw-type outer cover 50. On the other hand, if the number of container screw threads 27 is six, the rotation angle of the screw-type outer cover 50 is only about 60 degrees in order to complete the screw connection between the container body 20 and the screw-type outer cover 50. . However, if the number of container screw threads 27 is too large, the strength of the screw connection between the container body 20 and the screw-type outer lid 50 will be weakened. Therefore, the number of container screw threads 27 is appropriately selected from the viewpoints of the above-mentioned convenience during screwing and the screwing strength.

The peripheral wall portion 22 includes a flange portion 30 having an annular plate shape. The flange portion 30 is a part of the opening 23 and is located at the lower end of the opening 23. The flange portion 30 protrudes outward in the radial direction of the opening 23 over the entire circumferential direction of the opening 23 . The flange portion 30 increases the mechanical strength of the container body 20 in the radial direction of the opening 23. The flange portion 30 further includes a first group of protrusions 31 on the outer peripheral surface of the flange portion 30 . The first protrusion group 31 is equally distributed along the circumferential direction of the flange portion 30 at intervals. One first protrusion group 31 exists for each container thread 27. The outer circumferential surface of the flange portion 30 is an example of the first portion.

The first protrusion group 31 includes a first front protrusion 32 and a first rear protrusion 33, which are examples of first protrusions. The first front projection 32 and the first rear projection 33 protrude from the outer peripheral surface of the flange portion 30 toward the inner peripheral surface of the screw-type outer lid 50 in the closed resin container 10 . When the resin container 10 is closed, one direction in which the screw-type outer lid 50 rotates relative to the container body 20 is the screwing direction RD, that is, the second direction when the screw-type outer lid 50 is screwed. This is the direction in which the protrusion advances. The first rear projection 33 is located in the screwing direction RD with respect to the first front projection 32. The first front-stage projection 32 and the first rear-stage projection 33 are spaced apart from each other in the screwing direction RD.

In the radial direction of the flange portion 30, the size by which the first front stage projection 32 projects is smaller than the size by which the first rear stage projection 33 projects in the radial direction. In other words, in the closed resin container 10 , the distance between the inner peripheral surface of the screw-type outer lid 50 and the first front-stage projection 32 is the same as the distance between the inner peripheral surface of the screw-type outer lid 50 and the first rear-stage projection 33 . greater than distance. That is, the first front-stage projections 32 and the first rear-stage projections 33 are arranged in such a way that the distance between the inner circumferential surface of the screw-type outer lid 50 and the first projection group 31 becomes smaller in the screwing direction RD.

The peripheral wall portion 22 has an upper wavy wall 48 at the lower end of the flange portion 30 over the entire circumferential direction of the flange portion 30 . The upper wavy wall 48 has a wavy shape that projects downward. The upper end of the upper wavy wall 48 is connected to the flange portion 30, and the lower end of the upper wavy wall 48 is connected to the lower wavy wall 46. The lower wavy wall 46 has a wavy shape that projects upward, and the inner diameter of the lower end of the lower wavy wall 46 is reduced downward. The upper end of the lower wavy wall 46 is connected to the upper wavy wall 48, and the lower end of the lower wavy wall 46 is connected to the plane wall portion 45 and the corner with respect to one wave shape of the lower wavy wall 46. One each is provided in series in each section 44.

As shown in FIG. 3 , the plane wall portions 45 and the corner portions 44 are alternately arranged along the circumferential direction of the flange portion 30 . The plane wall portion 45 has a rectangular flat plate shape that is inclined downwardly and inwardly from the flange portion 30 . The corner portion 44 is located between the mutually adjacent planar wall portions 45 and has a triangular plate shape with an inclination toward the lower inner side of the flange portion 30 . The corner portion 44 has a shape in which the boundary between the plane wall portions 45 is chamfered. The plane wall portion 45 and the corner portion 44 have a polygonal cylindrical shape whose diameter is reduced downward. The lower end of the plane wall portion 45 is connected to the bottom curved portion 43 , and the lower end of the corner portion 44 is connected to the bottom curved corner portion 47 . The bottom curved portions 43 and the bottom curved corners 47 are arranged alternately along the circumferential direction of the flange portion 30, and the lower ends of the bottom curved portions 43 and the bottom curved corners 47 are connected to the container bottom wall portion 40. It is set up.

The lower surface of the container bottom wall 40 includes four bottom supports 41 . A gate mark 42 is located at the center of the lower surface of the container bottom wall 40. Each bottom support portion 41 is an arcuate protrusion located on a circle centered on the gate mark 42 . Each bottom support portion 41 is in contact with a placement surface on which the resin container 10 is placed. Each bottom support part 41 forms a gap between the lower surface of the container bottom wall part 40 and the mounting surface to promote heat radiation when the resin container 10 is heated.

[Screw type outer lid]
Returning to FIG. 1, the screw-type outer lid 50 includes a lid plate portion 60 having a disc shape and a lid peripheral wall 51 having a cylindrical shape.

The lid peripheral wall 51 includes a plurality of anti-slip portions 52 scattered along the circumferential direction of the lid peripheral wall 51. The anti-slip portion 52 has small irregularities in a semicircular region that projects downward. The anti-slip portion 52 is formed, for example, by sandblasting. The anti-slip portion 52 prevents a hand from slipping on the screw-type outer cover 50 when screwing the screw-type outer cover 50 onto the container body 20. The boundary between the lid peripheral wall 51 and the lid plate portion 60 is an outer peripheral step portion 57. The outer peripheral stepped portion 57 is connected to the outer edge of the lid plate portion 60, and the lid peripheral wall 51 protrudes outward and downward from the lower end of the outer peripheral stepped portion 57. The outer peripheral stepped portion 57 disposes the lid peripheral wall 51 outside the outer edge of the lid plate portion 60.

The lid plate portion 60 includes a lid outer peripheral portion 61 located at the outermost periphery of the lid plate portion 60, a lid intermediate portion 62, and a lid inner peripheral portion 63 located at the innermost periphery of the lid plate portion 60. A gate mark 64 is located at the center of the inner peripheral portion 63 of the lid. The lid outer peripheral portion 61 and the lid intermediate portion 62 have annular plate shapes that are concentric with each other with the gate mark 64 as the center. The boundary between the lid outer circumferential portion 61 and the lid intermediate portion 62 and the boundary between the lid intermediate portion 62 and the lid inner circumferential portion 63 have downward steps. The lid plate portion 60 is gradually recessed downward from the outer peripheral portion of the lid plate portion 60 toward the gate mark 64 by steps at each boundary portion.

As shown in FIG. 2 , the lid peripheral wall 51 includes a lid-side screw portion 53 , a thin portion 56 , and an outer ring 72 . The lid side screw portion 53 is composed of a lid side screw peripheral wall 54 and a lid screw thread 55 which is an example of a second screw thread. The lid-side screw peripheral wall 54 is located outside the outer ring 72. In addition, six lid screw threads 55 are located on the lid side screw peripheral wall 54 over the entire circumferential direction. The six lid screw threads 55 are arranged along the circumferential direction of the lid side screw peripheral wall 54 so that the ends of the lid screw threads 55 that are adjacent to each other overlap in the vertical direction. That is, each lid thread 55 is configured to be able to be screwed together with a separate container thread 27. The thin portion 56 is located at the lower end of the lid-side screw portion 53 and is thinner than the lid-side screw peripheral wall 54 .

As shown in FIG. 3, the inner circumferential surface of the thin portion 56 is an example of the second portion, and includes a plurality of lid-side protrusions 58 extending in the vertical direction. The plurality of lid-side protrusions 58 are an example of second protrusions, and are six protrusions located on the inner peripheral surface of the screw-type outer lid 50 and extending in the vertical direction. The lid-side protrusion 58 projects from the inner peripheral surface of the screw-type outer lid 50 to the outer peripheral surface of the container body 20 in the radial direction of the screw-type outer lid 50 . The lid-side protrusion 58 is located over the entire area from the lower end of the thin portion 56 to the lower end of the lid-side screw portion 53 in the vertical direction. When the container screw portion 25 and the lid screw portion 53 are screwed together, the lid-side projection 58 rides over the first front-stage projection 32 or the first rear-stage projection 33 in the screwing direction RD before the screwing is completed. This provides the user with a sense of engagement.

The six lid-side protrusions 58 are equally distributed along the circumferential direction of the thin-walled portion 56 at intervals. Further, the six first protrusion groups 31 are also lined up along the outer peripheral surface of the flange portion 30 at equal intervals. That is, the combinations of the lid-side projections 58 and the first projection group 31 are one set for each container threaded portion 25 and one set for each lid-side threaded portion 53. When the container threaded portion 25 and the lid-side threaded portion 53 are screwed together, each lid-side protrusion 58 rides over the separate first protrusion group 31 at the same time. All combinations of the lid-side protrusions 58 and the first protrusion group 31 contribute to providing a screwing feeling.

The outer peripheral portion on the lower surface of the lid outer peripheral portion 61 is provided with a container insertion portion 70 that is a U-shaped groove that opens downward. The container insertion portion 70 is an annular groove centered on the gate mark 64 of the lid plate portion 60. The container insertion portion 70 includes an outer ring 72, a groove bottom wall 73, and an inner ring 71 in this order from the outer peripheral wall.

The inner ring 71 is an annular protrusion extending along the circumferential direction of the cover plate portion 60 and is located inside the groove bottom wall 73 in the radial direction. The inner ring 71 protrudes toward the inside of the opening 23 from the lower surface of the cover plate 60 over the entire circumferential direction of the opening 23 . The outer ring 72 and the inner ring 71 constitute groove side walls of the U-shaped groove.

The top surface 24 of the opening 23 of the container body 20 is inserted into the container insertion portion 70 in the closed resin container 10 . The top surface 24 of the opening 23 inserted into the container insertion section 70 comes into close contact with the bottom surface of the container insertion section 70, thereby closing the lid of the resin container 10, that is, the container body 20 and the screw-type outer lid 50. The screwing is completed.

[protrusion]
FIG. 4 shows a state in which the first rear projection 33 and the lid-side projection 58 are in contact with each other, and the lid-side projection 58 rides over the first rear projection 33 from the back side of the paper toward the front side of the paper.

As shown in FIG. 4, the lid-side protrusion 58 is located on the back side of the paper with respect to the first rear-stage protrusion 33, and is indicated by a broken line. The lid-side protrusion 58 has a semi-cylindrical shape extending in the vertical direction, and is located on the inner surface of the thin-walled portion 56 over the entire vertical direction of the thin-walled portion 56 . The length of the lid side protrusion 58 in the vertical direction is equal to the length of the thin wall portion 56 in the vertical direction. The distance from the boundary between the thin wall portion 56 and the lid-side screw peripheral wall 54 to the lower end of the thin wall portion 56 is the second protrusion height FT. The length of the lid-side protrusion 58 in the vertical direction is equal to the second protrusion height FT.

The first front-stage projection 32 and the first rear-stage projection 33 have a semi-cylindrical shape extending in the vertical direction. The first protrusion group 31 is located on the outer peripheral surface of the flange portion 30 in the vertical direction of the flange portion 30 . The length of the first rear projection 33 in the vertical direction is equal to the length of the flange portion 30 in the vertical direction. The distance from the upper end to the lower end of the flange portion 30 is the first protrusion height YT. The first protrusion height YT is shorter than the second protrusion height FT.

The position of the lid-side protrusion 58 is such that it advances in the screwing direction RD toward the first rear-stage projection 33 and is displaced downward toward the first rear-stage projection 33 by the time the screw-type outer lid 50 is completely screwed together. do. The position of the first rear protrusion 33 in the screwing direction RD and the circumferential direction of the first rear protrusion 33 are adjusted so that the lid side protrusion 58 and the first rear protrusion 33 that are displaced in this way come into contact with each other before the screwing is completed. The position at and the second protrusion height FT are set. Further, the position of the first rear protrusion 33 in the screwing direction RD and the circumferential direction of the first rear protrusion 33 are adjusted so that the lid side protrusion 58 and the first rear protrusion 33 get over each other before the screwing is completed. The location is set.

For example, in a set of the container thread 27 and the lid thread 55 that are screwed together, the lid side protrusion 58 corresponding to the container thread 27 is located near the tip of the container thread 27 in the screwing direction RD. Further, the first rear projection 33 corresponding to the lid thread 55 is located near the tip of the lid thread 55 in the screwing direction RD. As a result, before the end of the container thread 27 and the end of the lid thread 55 are completely screwed together, the corresponding lid-side protrusions 58 and first rear-stage protrusions 33 come into contact with each other and overcome each other.

The length in the radial direction between the outer circumferential wall and the inner circumferential surface of the lid-side screw circumferential wall 54 is the female screw thickness NA. The length in the radial direction between the outer peripheral surface and the inner peripheral surface of the thin wall portion 56 is the thin wall thickness UA. The female thread thickness NA is larger than the thin wall thickness UA. The fact that the female screw thickness NA is larger than the thin wall thickness UA increases the mechanical strength of the lid-side screw peripheral wall 54 and suppresses deformation of the screw-type outer lid 50. The fact that the thin wall thickness UA is smaller than the female screw thickness NA ensures a gap between the flange portion 30 and the thin wall portion 56 that allows the first rear projection 33 and the lid side projection 58 to cross over each other. Make it easier.

The distance in the radial direction between the inner peripheral surface of the lid-side screw peripheral wall 54 and the central axis CA of the resin container 10 is the first lid inner diameter NW. The distance in the radial direction between the inner circumferential surface of the thin portion 56 and the central axis CA of the resin container 10 is the second lid inner diameter KW. The first lid inner diameter NW is shorter than the second lid inner diameter KW, and the inner circumferential surface of the lid-side screw peripheral wall 54 is located radially inner than the lid-side protrusion 58. The fact that the lid-side screw peripheral wall 54 is located radially inside the lid-side protrusion 58 makes it easier to pull out the mold located inside the screw-type outer lid 50 downward during mold cutting in injection molding. .

[Effect]
With reference to FIGS. 5 to 8, provision of a screw-fitting feeling when the amount of heat shrinkage of the container body 20 is larger than the amount of heat shrinkage of the screw-type outer lid 50 will be described. FIG. 5 shows that the lid side protrusion 58 is located in front of the first protrusion group 31 with respect to the screwing direction RD. Further, in FIG. 5, the position of the outer circumferential surface 3S of the flange portion 30 when the amount of thermal contraction of the screw-type outer lid 50 and the amount of thermal contraction of the container body 20 are approximately equal is shown by a two-dot chain line.

As shown in FIG. 5, the lid-side protrusion 58, the first front-stage protrusion 32, and the first rear-stage protrusion 33 are located in this order in the screwing direction RD. The amount by which the lid-side protrusion 58 projects from the inner circumferential surface 5S of the lid peripheral wall 51 is a lid-side protrusion amount H0. The amount by which the first front protrusion 32 protrudes from the outer peripheral surface 3S of the flange portion 30 is the first front protrusion amount HS. The amount by which the first rear projection 33 projects from the outer circumferential surface 3S of the flange portion 30 is the first rear projection amount HH. The distance in the circumferential direction between the first front-stage projection 32 and the first rear-stage projection 33 is a separation distance BW. The separation distance BW is sufficiently larger than the distance in the circumferential direction that the lid-side projection 58 has, and allows the lid-side projection 58 to move between the first front-stage projection 32 and the first rear-stage projection 33. The distance between the inner circumferential surface 5S of the lid circumferential wall 51 and the outer circumferential surface 3S of the flange portion 30 is the screw engagement gap HA.

For example, when the amount of heat shrinkage of the container main body 20 is larger than that of the screw-type outer lid 50, such as when only the container main body 20 is heated, in the resin container whose lid has started to be closed, The first front-stage projection 32 and the first rear-stage projection 33 are displaced inwardly with respect to the lid-side projection 58, and the screw engagement gap HA is widened.

Here, if the amount of heat shrinkage of the container body 20 is larger than the amount of heat shrinkage of the screw-type outer lid 50, the sum of the lid side protrusion amount H0 and the first front stage protrusion amount HS is smaller than the screw clearance HA. The first front protrusion 32, the first rear protrusion 33, and the lid side protrusion 58 are arranged so that. As a result, as shown in FIG. 6, when the lid-side protrusion 58 that advances in the screwing direction RD passes through the first protrusion group 31, it does not come into contact with the first pre-protrusion 32, and instead moves toward the first protrusion 32. , and proceeds toward the first rear-stage protrusion 33 .

On the other hand, when the amount of heat shrinkage of the container body 20 is larger than the amount of heat shrinkage of the screw-type outer lid 50, the sum of the lid side protrusion amount H0 and the first rear protrusion amount HH is larger than the screw gap HA. . Therefore, as shown in FIG. 7, the lid-side projection 58 that has passed the first front-stage projection 32 comes into contact with the first rear-stage projection 33, and the advancement of the lid-side projection 58 is temporarily stopped. The resistance feeling caused by the contact between the lid-side protrusion 58 and the first rear-stage protrusion 33 is provided as a screwing feeling.

Next, when the lid-side protrusion 58 receives stress in the screwing direction RD, the lid-side protrusion 58 climbs over the first rear-stage protrusion 33, as shown in FIG. When the lid-side projection 58 climbs over the first rear-stage projection 33, elastic deformation of the lid-side projection 58 and elastic deformation of the first rear-stage projection 33 occur, and the sound and vibration generated by the elastic deformation are provided as a screwing sensation. Then, when the lid-side protrusion 58 further advances in the screwing direction RD, the bottom surface of the container insertion part 70 and the top surface 24 of the opening 23 come into close contact with each other as the screwing progresses, whereby the resin container 10 The closing of the lid, that is, the screwing together of the container body 20 and the screw-type outer lid 50 is completed.

Next, with reference to FIG. 9, a description will be given of how the screw-fitting feeling is provided when the amount of heat shrinkage of the screw-type outer lid 50 and the amount of heat shrinkage of the container body 20 are approximately equal. FIG. 9 shows that the lid side protrusion 58 is located in front of the first protrusion group 31 with respect to the screwing direction RD.

For example, when the amount of heat shrinkage of the container body 20 and the amount of heat shrinkage of the screw-type outer lid 50 are almost equal, such as when the resin container has not been heated since shipping, the resin container is In the container manufacturing, the first front-stage projection 32 and the first rear-stage projection 33 are closer to the lid-side projection 58 than in the state shown in FIG.

Here, when the amount of heat shrinkage of the container body 20 and the amount of heat shrinkage of the screw-type outer lid 50 are almost equal, the sum of the lid side protrusion amount H0 and the first front protrusion amount HS is larger than the screw clearance HA. The first front protrusion 32, the first rear protrusion 33, and the lid side protrusion 58 are arranged so that. As a result, as shown in FIG. 9, the lid-side protrusion 58 advancing in the screwing direction RD comes into contact with the first protrusion group 31, and the progress of the lid-side protrusion 58 is temporarily stopped. The resistance feeling caused by the contact between the lid-side protrusion 58 and the first front-stage protrusion 32 is provided as a screwing feeling.

Next, when the lid-side protrusion 58 receives stress in the screwing direction RD, the lid-side protrusion 58 rides over the first front-stage protrusion 32, as shown in FIG. When the lid-side projection 58 climbs over the first front-stage projection 32, elastic deformation of the lid-side projection 58 and elastic deformation of the first front-stage projection 32 occurs, and the sound and vibration generated by the elastic deformation are provided as a screwing sensation. Then, when the lid-side protrusion 58 moves further in the screwing direction RD, the lid-side protrusion 58 moves between the first front-stage projection 32 and the first rear-stage projection 33, and the lid-side projection 58 moves between the first rear-stage projection 32 and the first rear-stage projection 33. It comes into contact with the protrusion 33 and also gets over the first rear protrusion 33.
This completes the closing of the resin container 10, that is, the screwing together of the container body 20 and the screw-type outer lid 50. Alternatively, the lid-side protrusion 58 comes into contact with the first rear-stage protrusion 33 and stops, thereby completing the closing of the resin container 10, that is, the screwing together of the container body 20 and the screw-type outer lid 50.

Next, with reference to FIGS. 11 and 12, a description will be given of providing a screw-fitting feeling when the amount of heat shrinkage of the screw-type outer lid 50 is larger than the amount of heat shrinkage of the container body 20. With reference to FIG. 11, a case will be described in which the lid-side protrusion 58 is located in front of the first front-stage protrusion 32 when the screwing is completed. Next, with reference to FIG. 12, a case where the lid-side protrusion 58 is located between the first front-stage protrusion 32 and the first rear-stage protrusion 33 when the screwing is completed will be described. In addition, in FIGS. 11 and 12, the position of the inner peripheral surface 5S of the lid peripheral wall 51 in the case where the amount of thermal contraction of the screw-type outer lid 50 and the amount of thermal contraction of the container body 20 are approximately equal is shown by a two-dot chain line.

As shown in FIG. 11, when the container body 20 is an unheated product and the screw-type outer lid 50 is a heated product, the amount of heat shrinkage of the screw-type outer lid 50 is the amount of heat shrinkage of the container body 20. 9, the first front-stage projection 32 and the first rear-stage projection 33 are closer to the lid-side projection 58 than in the state shown in FIG. 9 in the resin container whose lid has started to be closed. In other words, the screw engagement gap is further narrowed.

Then, when the screwing progresses further from the state where the lid-side protrusion 58 is located in front of the first front-stage projection 32, the lid-side projection 58 comes into contact with the first front-stage projection 32 and climbs over the first front-stage projection 32. At this time, the resistance feeling caused by the contact between the lid-side projection 58 and the first front-stage projection 32 and the sound and vibration when the lid-side projection 58 rides over the first front-stage projection 32 are provided as a feeling of screwing together. .

As shown in FIG. 12, when the lid-side protrusion 58 is further subjected to stress in the screwing direction RD, the lid-side protrusion 58 comes into contact with the first rear-stage protrusion 33, but the screwing gap HA is narrowed. As a result, the first rear projection 33 cannot be climbed over, thereby completing the screw engagement. Alternatively, due to the narrowing of the screwing gap HA, the lid-side projection 58 does not reach the first rear-stage projection 33, but comes into contact with the inner circumferential surface 5S of the lid peripheral wall 51 and stops, thereby completing the screwing. do.

As described above, according to the above embodiment, the following effects can be obtained.
(1) The first protrusion group 31 includes a first rear-stage protrusion 33 that the lid-side protrusion 58 overcomes when the screwing gap HA is large, and further includes a first rear-stage protrusion 33 that the lid-side protrusion 58 overcomes when the screwing gap HA is small. A front stage projection 32 is provided. Therefore, even if the screwing gap HA changes due to thermal contraction, it is possible to provide a screwing feeling.

(2) As the screw-type outer lid 50 is screwed together, the lid-side protrusion 58 located on the screw-type outer lid 50 is displaced downward while being displaced in the circumferential direction. At this time, if the length of the lid-side protrusion 58 in the vertical direction is larger than the length of the first projection group 31 in the vertical direction, as the screw-type outer lid 50 is screwed together, The long lid-side protrusion 58 is displaced downward. This makes it possible to increase the accuracy with which the lid-side protrusion 58 crosses the first protrusion group 31.

As a result, compared to a structure in which the length of the lid-side projection 58 in the vertical direction is short, it becomes easier for the lid-side projection 58 to pass through the first projection group 31 before the screwing is completed. In addition, the first front-stage projection 32 and the lid-side projection 58 may come into contact with each other, causing the lid-side projection 58 to ride over the first front-stage projection 32, or the first rear-stage projection 33 and the lid-side projection 58 may come into contact with each other, causing the lid-side projection 58 to come into contact with the lid-side projection 58. 58 can easily overcome the first rear projection 33.

(3) The outer circumferential surface of the flange portion 30 includes a plurality of first protrusion groups 31 equally distributed in the circumferential direction, and the inner circumferential surface of the thin wall portion 56 includes a plurality of first protrusion groups 31 equally distributed in the circumferential direction. A plurality of lid-side protrusions 58 of the same number are provided. This makes it possible to align the timing at which the lid-side protrusion 58 passes over the first front-stage protrusion 32 and the first rear-stage protrusion 33, that is, the timing at which the screwing feeling is provided for the plurality of lid-side protrusions 58. . Thereby, it becomes possible to superimpose and strengthen the screwing feeling caused by each lid-side protrusion 58 climbing over the first protrusion group 31.

(4) One first protrusion group 31 is located on each container screw thread 27, and one lid-side protrusion 58 is located on each lid thread 55, so each lid-side protrusion 58 is located on the first protrusion group 31. It is easy to match the timing at which the lid screw threads 55 and the container screw threads 27 are completely screwed together. That is, it is easy to match the timing at which the screwing feeling is provided and the progress of the screwing so that the timing at which the screwing feeling is provided is before the completion of the screwing.

(5) The temperature at which the container body 20 and the screw-type outer lid 50 are heated varies depending on the environment in which the resin container 10 is used. The amount of heat shrinkage of the container body 20 and the amount of heat shrinkage of the screw-type outer lid 50 also vary. As a result, when the container body 20 and the screw-type outer lid 50 are completely screwed together, the relative positions of the first protrusion group 31 and the lid-side protrusion 58 vary depending on the environment in which the resin container 10 is used. becomes.

Here, in the configuration in which the lid-side projection 58 is inserted between the first front-stage projection 32 and the first rear-stage projection 33, thereby completing the threaded engagement between the container body 20 and the screw-type outer lid 50, the container Even though the screwing between the main body 20 and the screw-type outer lid 50 is not actually completed, the screwing between the container body 20 and the screw-type outer lid 50 is forcibly stopped. For example, the lid side protrusion 58 needs to rotate by a predetermined screwing distance along the circumferential direction of the flange portion 30 from the start of the screwing to the completion of the screwing. Here, if the screw-type outer lid 50 does not heat-shrink and the container body 20 heat-shrinks, the position facing the lid-side protrusion 58 in the flange portion 30 at the start of screwing, and the position at the beginning of screwing The distance in the screwing direction RD between the container body 20 and the first projection group 31 becomes shorter than the screwing distance by the amount that the container body 20 is thermally shrunk. As a result, the lid-side protrusion 58 entering between the first front-stage protrusion 32 and the first rear-stage protrusion 33 causes close contact between the bottom surface of the container insertion part 70 and the top surface 24 of the opening 23, that is, the container main body 20 This occurs before the threading of the screw-type outer lid 50 is completed.

In this regard, according to the resin container 10, the lid-side protrusion 58 is movable in the circumferential direction in the interval between the first front-stage protrusion 32 and the first rear-stage protrusion 33, so that the screwing that should originally be proceeded is carried out midway. This will prevent you from being stopped.

(6) The outer peripheral surface of the flange portion 30 is the outermost surface of the container body 20 and is a relatively easy part to clean in the resin container 10. This is a relatively easy part to process. In this regard, since the first protrusion group 31 composed of the first front-stage protrusion 32 and the first rear-stage protrusion 33 is located on the outer circumferential surface of the flange portion 30, it can achieve the effects according to (1) to (5) above. In addition, it is also possible to prevent the cleaning performance of the resin container 10 from decreasing and the difficulty in manufacturing the resin container 10.

Note that the above embodiment can be modified and implemented as follows.
[Modification example 1: Intermediate protrusion]
As shown in FIG. 13, the first protrusion group 31 having a plurality of engagement parts may further include an intermediate protrusion 34 between the first front protrusion 32 and the first rear protrusion 33. The protrusion amount CH, which is the protrusion size of the intermediate protrusion 34, is larger than the protrusion size of the first front protrusion 32 and smaller than the protrusion size of the first rear protrusion 33. In the screwing direction RD, the intermediate protrusion 34 is located between the first front protrusion 32 and the first rear protrusion 33. The distance BWA between the first front projection 32 and the intermediate projection 34 in the screwing direction RD may be equal to or different from the distance BWB between the intermediate projection 34 and the first rear projection 33 in the screwing direction RD. It's okay.

With the configuration including the intermediate protrusion 34, it is possible to provide a more appropriate screwing feeling or to widen the temperature range at which the screwing feeling can be obtained.
For example, if the separation distance BW between the first front-stage protrusion 32 and the first rear-stage protrusion 33 is the same as in the embodiment described above, the protrusion that provides a more suitable screwing feeling among the first protrusion group 31 It is possible to selectively abut the lid side protrusion 58 from among the first protrusion group 31. Further, for example, if the separation distance BW between the first front-stage projection 32 and the first rear-stage projection 33 is larger than that in the above-described embodiment, it is possible to provide a screwing feeling even with a larger difference in thermal contraction.

[Modification example 2: Third protrusion]
As shown in FIG. 14, a third protrusion 35 may be provided in the screwing direction RD of the first rear-stage protrusion 33. The protrusion amount HT of the third protrusion 35 is higher than the first rear-stage protrusion amount HH. The distance TW in the circumferential direction between the first rear protrusion 33 and the third protrusion 35 is sufficiently smaller than the separation distance BW, for example, approximately equal to the distance in the circumferential direction between the lid side protrusion 58, and the distance TW between the first rear protrusion 33 and the third protrusion 35 is The size is such that the lid side protrusion 58 can be locked between the three protrusions 35.

According to this configuration, the lid-side protrusion 58 that has climbed over the first rear-stage protrusion 33 is locked between the first rear-stage protrusion 33 and the third protrusion 35 . Therefore, it is possible to prevent the lid-side protrusion 58 from moving in the opposite direction to the screwing direction RD, that is, from loosening the screwing between the container body 20 and the screw-type outer lid 50.

[Modification example 3: Union protrusion]
As shown in FIG. 15, the first front-stage projection 32 and the first rear-stage projection 33 may be one projection having a shape in which two projections are combined. For example, a protrusion connecting portion 36 that connects the first front protrusion 32 and the first rear protrusion 33 may be provided between the first front protrusion 32 and the first rear protrusion 33 .

According to this configuration, the lid-side protrusion 58 that has climbed over the first front-stage protrusion 32 is connected to the protrusion-connecting part 36 between the first front-stage protrusion 32 and the first rear-stage protrusion 33 by the amount that the protrusion connecting part 36 protrudes. It can come into contact with you. Therefore, it is possible to prevent the lid-side protrusion 58 that has climbed over the first front-stage protrusion 32 from moving in the opposite direction to the screwing direction RD, that is, to prevent the screwing between the container body 20 and the screw-type outer lid 50 from loosening. .

[Change example 4: Quantity of protrusions]
As shown in FIG. 16, the screw-type outer lid 50 may include two lid-side protrusions 80, 81, and the container body 20 may include two first front-stage protrusions 32, 37 and two first The rear projections 33 and 38 may also be provided. At this time, the interval in the circumferential direction between the two lid-side protrusions 80 and 81 is the interval in the circumferential direction between the two first front-stage protrusions 32 and 37 and the interval in the circumferential direction between the two first rear-stage protrusions 33 and 38. equal.

In such a configuration, when the container main body 20 and the screw-type outer lid 50 are screwed together, the lid-side protrusions 80 and 81 do not come into contact with the first front-stage projections 32 and 37, and the first front-stage projections 32 and 37 in the screwing direction RD. Subsequently, the lid-side protrusion 81 that has passed through the first front-stage protrusions 32 and 37 comes into contact with the first rear-stage protrusion 33, and after getting over the first rear-stage protrusion 33, comes into contact with the first rear-stage protrusion 38. At this time, the lid-side protrusion 81 that has passed through the first front-stage projections 32 and 37 comes into contact with the first rear-stage projection 33. Then, when the container body 20 and the screw-type outer lid 50 are screwed together, the two lid-side protrusions 80 and 81 get over the separate first rear-stage protrusions 33 and 38 at the same timing. This makes it possible to provide a stronger screwing feeling.

- The combination of the first protrusion group 31 and the lid-side protrusion 58 is not limited to one set per screw thread, for example, one set per two thread threads, or two sets per thread thread. It may be.
- The container body 20 may include a plurality of first protrusion groups 31 arranged in the vertical direction. At this time, the screw-type outer lid 50 may include a plurality of lid-side protrusions 58 so as to engage with each of the first protrusion groups 31 through the screw engagement between the container body 20 and the screw-type outer lid 50.

- The position of the first protrusion group 31 is not limited to the flange portion 30 but can be changed to the opening portion 23. At this time, the container body 20 may have a configuration in which the flange portion 30 is omitted. In short, the first protrusion group 31 may be positioned on the container body 20 so as to engage with the lid-side protrusion 58 through the screw engagement between the container body 20 and the screw-type outer lid 50.

10... Resin container 20... Container body 23... Opening part 30... Flange part 31... First projection group 50... Screw type outer lid 56... Thin wall part 58... Lid side protrusion 60... Lid plate part RD... Screwing direction

Claims (6)

a container body having a cylindrical opening;
a screw-type outer lid having an inner circumferential surface that screws into the outer circumferential surface of the opening;
Either one of the outer circumferential surface and the inner circumferential surface is a first part,
Of the outer circumferential surface and the inner circumferential surface, a portion other than the first portion is a second portion,
The first part includes a plurality of first protrusions that protrude toward the second part,
The second part includes a second protrusion that protrudes toward the first part,
The direction in which the second protrusion advances when the screw-type outer lid is screwed together is the screwing direction,
The plurality of first protrusions are arranged in a circumferential direction of the first part such that a distance between each of the first protrusions and the second part becomes smaller in the screwing direction,
The plurality of first protrusions have a semi-cylindrical shape,
The second protrusion is configured to pass through the plurality of first protrusions, come into contact with at least one of the first protrusions, and ride over the first protrusion before the screwing is completed. The first part is an outer peripheral surface of the opening,
The resin container according to claim 1, wherein the second portion is an inner circumferential surface of the screw-type outer lid. The resin container according to claim 1 or 2, wherein the second protrusion is longer than the first protrusion in the vertical direction. The plurality of first protrusions are a first protrusion group,
The first part includes a plurality of the first protrusion groups equally distributed in the circumferential direction,
The resin container according to any one of claims 1 to 3, wherein the second portion includes a plurality of second protrusions that are equally distributed in the circumferential direction and have the same number as the first group of protrusions. The first part includes a plurality of first screw threads equally distributed in the circumferential direction,
The second part includes a plurality of second screw threads that are equally distributed in the circumferential direction and have the same number as the first thread threads,
The first protrusion group is located one on each first screw thread,
The resin container according to claim 4, wherein one second projection is located on each second thread. The interval between the first protrusions adjacent to each other in the circumferential direction is a size that allows the second protrusion located at the interval to move in the circumferential direction. Resin container.