JP5834460B2 - Container with synthetic resin lid - Google Patents

Description

  The present invention relates to a synthetic resin container having a detachable lid.

  Conventionally, as this type of synthetic resin container, for example, the one described in Patent Document 1 is known. FIG. 9 is a cross-sectional view showing the cross-sectional structure of the synthetic resin lidded container, and is an enlarged view of the fitting structure between the lid and the container body shown in region F. FIG.

  As shown in FIG. 9, a substantially cylindrical body peripheral wall 62 that is gradually increased in diameter toward the opening 60 e of the container body 60 is connected to the bottom wall 61 of the container body 60. On the outer peripheral surface of the main body peripheral wall 62, a flange-shaped first annular hooking strip 63a, a second annular hooking strip 63b, and a third annular hooking projection projecting radially outward over the entire circumference of the outer peripheral surface. The stop 63c is formed at substantially equal intervals in order from the opening 60e.

  On the other hand, on the outer peripheral portion of the disc-shaped lid 70 attached to the opening 60e, a cylindrical lid inner peripheral wall 72 and a lid outer peripheral wall 73 projecting toward the bottom wall 61 over the entire circumference of the outer peripheral portion, It is formed in order from the center of the lid 70. Further, on the inner peripheral surface of the lid outer peripheral wall 73, a first annular latching strip 74a, a second annular latching strip 74b, and a third annular latching projecting radially inward over the entire circumference of the inner circumferential surface. The strips 74 c are formed at substantially equal intervals in order from the top surface side of the lid 70.

  When the lid 70 is attached to the container body 60, the body peripheral wall 62 in the vicinity of the opening 60 e of the container body 60 is inserted between the lid inner peripheral wall 72 and the lid outer peripheral wall 73 of the lid 70. As a result, the first annular latching strip 63a is latched by the first annular latching strip 74a so as to be lifted from below, and the second annular latching strip 63b and the third annular latching strip 63c are also the second. It is latched so as to be lifted from below by the annular latching strip 74b and the third annular latching strip 74c. As a result, the opening 60 e and the main body peripheral wall 62 in the vicinity of the opening 60 e are uniformly hooked by the entire area of the lid outer peripheral wall 73. Thereby, the opening part 60e of the container main body 60 closely_contact | adheres via the lid | cover 70 and sealing material RG (for example, a gasket, an O ring, etc.).

JP-A-11-321904

  By the way, the above-mentioned containers with synthetic resin lids are usually used for packing and transporting various articles such as liquids and solids inside. Impact force will be applied from any direction. In particular, when the synthetic resin lidded container is unloaded from, for example, a truck bed, the lid 70 may fall with the surface of the lid main body 71 tilted from a horizontal plane and collide with the ground. At this time, since the respective annular latching strips 74a to 74c are latched by the respective annular latching shapes 63a to 63c and the entire area of the lid outer peripheral wall 73 is hardened, the impact force due to the collision described above is applied to the lid 70. It extends without being buffered to the entire region of the outer peripheral wall 73 of the lid. As a result, the sealing performance of the container body 60 by the lid 70 may be impaired.

  This invention is made | formed in view of such a situation, and it aims at providing the container with a synthetic resin lid | cover which can improve sealing performance.

  Whether or not the sealing performance is impaired when the synthetic resin lidded container is handled roughly as described above, specifically, whether the lid is removed from the container body or not is the container with the lid after dropping. The state of can be visually confirmed. However, the mechanism by which the lid is removed from the container body cannot be recognized visually. In view of this, the present inventors assumed that the container with a synthetic resin lid sealed with liquid as the contents was handled most roughly, and dropped the lid with the lid tilted from the horizontal plane with the lid down. A test (hereinafter referred to as an inverted CAD drop test) was performed. At that time, the process of the deformation of the lid and the container body was photographed with a high-speed camera. Then, as a result of earnest analysis of the photographed image, a portion that is fluffed so as to bend inward in the radial direction and a portion that is fluffed so as to bend outward in the radial direction on the lid outer peripheral wall of the skirt-like lid of the lid And found to be mixed. At the same time, it has been found that the portion of the main body peripheral wall of the container body facing the portion where the lid outer peripheral wall is bent so as to bend outward in the radial direction is bent inward in the radial direction. Moreover, it discovered that a lid | cover began to remove | deviate from the container main body from the site | part brought together so that a lid outer peripheral wall may bend in the radial direction outer side.

  That is, the present invention is based on the above-described knowledge, the outer peripheral surface of the peripheral wall of the main body of the container body is above the position of the lower end of the outer peripheral wall of the lid when viewed in cross-section, and the lid is attached to the main body of the container In the region where the peripheral wall of the main body and the inner peripheral wall of the lid overlap, an annular rib is provided over the entire circumference, and the annular rib does not contact the entire inner circumferential surface of the outer peripheral wall of the lid in the circumferential direction. The gist of the present invention is that it is provided and is not latched by the inner peripheral surface of the outer peripheral wall of the lid.

And the synthetic resin lidded container according to the present invention comprises a synthetic resin container body and a synthetic resin lid,
(1) The container body includes a cylindrical main body peripheral wall, a bottom wall that closes a lower end of the main body peripheral wall, an opening at an upper end of the main body peripheral wall, a flange portion at an outer edge of the opening, An annular rib on the outer peripheral surface of the main body peripheral wall, and
(2) The lid includes a disc-shaped lid main body, a lid inner peripheral wall along the entire circumference of the outer peripheral portion of the lid main body, and a skirt that surrounds the entire circumference of the lid inner peripheral wall while being separated from the lid inner peripheral wall. A ring-shaped lid outer peripheral wall , and an annular latching strip formed on the inner circumferential surface of the lid outer circumferential wall and projecting toward the center of the lid so as to be latchable from below with respect to the flange portion ,
(3) The annular rib is located above the position of the lower end of the lid outer peripheral wall when viewed in cross section, and the main body peripheral wall and the lid inner peripheral wall overlap in a state where the lid is attached to the container main body. The distance D2 between the protruding end of the annular rib and the inner peripheral surface of the lid outer peripheral wall satisfies 0 mm <D2 ≦ 2 mm and is not hooked by the inner peripheral surface of the lid outer peripheral wall. In the state where the lid is mounted on the container body, a plane including a portion of the flange portion that is hooked by the annular latching strip is a flange surface, and the lid is mounted on the container body. In this state, the plane including the lower end of the lid outer peripheral wall is the outermost wall lowermost surface, and the annular rib is lower than the center position in the vertical direction between the flange surface and the outermost wall lowermost surface when viewed in cross section. It is provided to

  By providing the annular rib in this manner, it is possible to more effectively suppress the amount that the lid outer peripheral wall is bent so as to bend inward in the radial direction. Further, in order to shorten the distance in the vertical direction with respect to the lower end of the lid outer peripheral wall so as not to generate an extra space, it is more preferable to provide it at a position near the lower end of the lid outer peripheral wall.

In the present invention, the inner peripheral wall of the lid is composed of an inner peripheral wall of the first lid and an inner peripheral wall of the second lid, and the inner peripheral wall of the first lid and the inner peripheral wall of the second lid are in a state where the lid is attached to the container body. It is also preferable that a folded portion protruding into the space inside the container body is formed, and the inner peripheral wall of the second lid is in contact with the inner peripheral surface of the container body.
In the present invention, it is preferable that the inner peripheral wall of the lid has a V shape or a U shape with the folded portion as a bending point when viewed in cross section.

  By providing the folded portion, an elastic force can be applied to the inner peripheral wall of the lid so as to support the main body peripheral wall of the container body so as to expand from the inside, and an impact force due to dropping can be buffered.

  In this invention, it is also preferable that the said folding | turning part has a cylindrical rib which protrudes in the space used as the inside of the said container main body in the state with which the said lid | cover was mounted | worn over the perimeter of the protrusion.

  By having the cylindrical rib, the stress concentration at the folded portion can be relaxed and reinforced.

  In the present invention, the outer peripheral surface of the peripheral wall of the main body has an entire periphery in a region closer to the bottom wall than a region that is surrounded by the outer peripheral wall of the lid in a state where the lid is attached to the container main body. It is also preferable that an auxiliary annular rib that protrudes radially outward from the annular rib is further provided.

  By providing the auxiliary annular rib, even if the synthetic resin lidded container collides with the ground in a sideways state, the auxiliary annular rib acts as a kind of stopper to buffer the impact and It is possible to suppress the lower end from being excessively pushed inward in the radial direction, and as a result, the lid outer peripheral wall can be hardly broken.

  According to the present invention, in the inverted quad drop test, the annular rib suppresses the amount of the skirt-like lid outer peripheral wall that is deflected inward in the radial direction. As a result, the amount by which the lid outer peripheral wall is bent so as to bend outward in the radial direction is suppressed. Further, the main body peripheral wall in the vicinity of the opening of the container main body is supported from the inside by the lid inner peripheral wall. As a result, deformation of the peripheral wall of the main body in the vicinity of the opening of the container main body is suppressed. For this reason, by giving flexibility to the lid outer peripheral wall of the lid, it is possible to buffer the impact force due to dropping and to make it difficult for the lid to come off from the container body.

  Further, the annular rib is provided so as not to contact the entire inner circumferential surface of the lid outer peripheral wall in the circumferential direction and is configured not to be hooked by the inner peripheral surface of the lid outer peripheral wall. Therefore, the lid can be attached to the container body without resistance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view partially showing a cross-sectional structure of an embodiment of a synthetic resin lidded container according to the present invention, and is an enlarged view showing a fitting structure between a lid and a container body. The fragmentary sectional view which shows typically the fall attitude | position at the time of the inverted-cad drop test of the container with a synthetic resin lid | cover of the embodiment. (A) is the partial side view which shows typically the process in which the influence which collided with the ground propagates when the container with a synthetic resin lid | cover of the same embodiment carries out an inverted quad drop test. (B) is the partial front view which shows partially the state which looked at the synthetic resin lidded container shown to (a) from the front direction. (A) is an expanded sectional view which expands and shows the cross section in the area | region B of FIG.3 (b). FIG. 4B is an enlarged cross-sectional view showing an enlarged cross section in a region C of FIG. (A) is the partial side view which shows typically the next process through which the influence which collided with the ground propagates when the container with a synthetic resin lid | cover of the embodiment carries out an inverted quad drop test. (B) is the partial front view which shows partially the state which looked at the synthetic resin lidded container shown to (a) from the front direction. (A) is an expanded sectional view which expands and shows the cross section in the area | region D of FIG.5 (b). FIG. 5B is an enlarged cross-sectional view showing an enlarged cross section in a region E of FIG. The expanded sectional view which shows an example of the container with a synthetic resin lid provided with the auxiliary | assistant annular rib. The expanded sectional view which shows typically the state which the container with a synthetic resin lid provided with the auxiliary | assistant annular rib collided with the ground from the side surface. It is a fragmentary sectional view which shows partially the section structure of the conventional container with a synthetic resin lid, and is a figure expanding and showing the fitting structure of a lid and a container main part.

  Hereinafter, one embodiment of a synthetic resin lidded container according to the present invention will be described in detail with reference to FIGS. First, with reference to FIG. 1, the structure of the synthetic resin lidded container of the present embodiment will be described.

  As shown in FIG. 1, a cylindrical body peripheral wall 12 that gradually increases in diameter toward the opening 10 e of the container body 10 is connected to the bottom wall 11 of the container body 10. As shown in the region A, the opening 10e of the container body 10 is formed with an annular flange portion 13 that extends outward in the radial direction over the entire circumference of the opening 10e. An annular rib 14 is formed on the outer peripheral surface 12 b of the main body peripheral wall 12 so as to protrude outward in the radial direction over the entire periphery of the outer peripheral surface 12 b on the bottom wall 11 side.

  In the lid 20 attached to the opening 10e, the lid main body 21, which is a portion excluding the outer peripheral portion, is formed in a disk shape having a smaller diameter than the opening 10e. A cylindrical inner peripheral wall 22 that extends from the outer edge of the lid main body 21 toward the bottom wall 11 is formed over the entire circumference of the lid 20 at a portion located on the radially inner side of the opening 10 e in the outer circumferential portion of the lid 20. ing. The lid inner peripheral wall 22 includes a first lid inner peripheral wall 22a extending from the outer edge of the lid main body 21 toward the bottom wall 11, a folded portion 22j formed below the first lid inner circumferential wall 22a, and the folded portion 22j. It is comprised from the 2nd lid inner peripheral wall 22b extended to the opening part 10e side.

  In the state where the lid 20 is attached to the container body 10, the first lid inner peripheral wall 22 a causes the lid inner peripheral wall 22 to function as a leaf spring, and the second lid inner peripheral wall 22 b is the inner peripheral surface of the main body peripheral wall 12. 12a. Note that a cylindrical rib 22r that extends over the entire circumference of the lid 20 protrudes from the folded portion 22j so as to extend toward the bottom wall 11 side. The cylindrical rib 22r relaxes the stress concentration of the folded portion 22j and increases the strength.

  A skirt-like lid outer peripheral wall 23 extending downward from the upper end side of the second lid inner peripheral wall 22b is formed on the outer peripheral portion of the lid 20 on the outer side in the radial direction of the opening 10e. ing. The lid outer peripheral wall 23 is connected to the second lid inner peripheral wall 22b of the lid inner peripheral wall 22 only at the upper end opposite to the lower end serving as the bottom of the skirt. An annular hook 24 that protrudes toward the center of the lid 20 is formed on the inner circumferential surface 23 a in the vicinity of the upper end of the lid outer peripheral wall 23.

  When the lid 20 is attached to the container body 10, the entire opening 10 e is inserted between the second lid inner peripheral wall 22 b and the lid outer peripheral wall 23, and only the flange portion 13 is an annular retaining strip. It is latched so as to be lifted from below by 24. As a result, the opening 10e comes into close contact with the lid 20 via the sealing material RG.

  The container body 10 and the lid 20 are synthetic resin molded products that are integrally molded together. In addition, the distance D1 formed by the first lid inner peripheral wall 22a and the second lid inner peripheral wall 22b at the upper end of the lid inner peripheral wall 22 is preferably within a range of 3 mm to 20 mm, and particularly 5 mm to 15 mm. More desirable. Thereby, the function as a leaf | plate spring of the lid inner peripheral wall 22 can be ensured with the moldability of the lid | cover 20 now.

  Next, the configuration of the annular rib 14 will be described in detail. Note that the flange surface PL1 shown in FIG. 1 is a plane including a portion of the flange portion 13 that is hooked by the annular hook 24 in a state where the lid 20 is mounted on the container body 10. The outermost wall lowermost surface PL2 is a plane including the lower end of the lid outer peripheral wall 23 in a state where the lid 20 is mounted on the container body 10. The rib uppermost surface PL3 is parallel to the flange surface PL1 and is a plane that is equidistant from the flange surface PL1 and the outermost wall lowermost surface PL2 in the vertical direction of the container body 10. The rib lowermost surface PL4 is a plane including the lowest point P4 which is the point on the bottom wall 11 side among the portions where the second lid inner peripheral wall 22b comes into contact with and closely contacts the inner peripheral surface 12a of the main body peripheral wall 12.

  The annular rib 14 is formed so as to protrude outward in the radial direction in a region sandwiched between the rib uppermost surface PL3 and the rib lowermost surface PL4 on the outer peripheral surface 12b of the main body peripheral wall 12. The annular rib 14 is also formed so as to face the inner peripheral surface 23 a of the lid outer peripheral wall 23 in a state where the lid 20 is mounted on the container body 10. The protruding end of the annular rib 14 is formed so as to be separated from the inner peripheral surface 23a of the skirt-like lid outer peripheral wall 23 in a state where the lid 20 is mounted on the container body 10.

  The protruding end of the annular rib 14 and the inner peripheral surface 23a of the lid outer peripheral wall 23 and the distance D2 suppress the amount that the lid outer peripheral wall 23 is bent so as to bend inward in the radial direction and consider formability. It is preferable to satisfy 0 mm <D2 ≦ 2 mm, and when emphasizing moldability, it is particularly preferable to satisfy 0.5 mm ≦ D2 ≦ 1.5 mm. Further, with the lid 20 mounted on the container body 10, the outer peripheral wall lowermost surface PL2 is disposed below the rib lowermost surface PL4, that is, closer to the bottom wall 11.

  Next, the effect | action of the synthetic resin lidded container which has the said structure is demonstrated with reference to FIGS.

  First, test conditions in an inverted CAD drop test for a container with a synthetic resin lid will be described.

  The container with a synthetic resin lid provided for this test is a plastic molded product having a capacity of 20 liters. This test is performed in accordance with the so-called UN standard, and specific test conditions are listed below.

  Prior to the test, the container with the synthetic resin lid with the contents sealed is left in a constant temperature bath maintained at 40 ° C. for 35 days to form a plastic material as a constituent material of the container with the contents. Stabilize the impact and implement so-called tempering. At this time, the lid and the container main body are not mechanically fitted, and the boundary portion is temporarily sealed using aluminum tape or the like. Depending on the test, the lid and the container body may be mechanically fitted.

  The content to be sealed is a liquid whose degree of dangerous goods is moderate according to the above-mentioned UN standards, such as n-propanol.

  After completion of the above tempering, the synthetic resin lidded container is opened and the contents are replaced with an antifreeze such as ethylene glycol, and the lid and the container main body are mechanically engaged and fully sealed.

  -A container with a synthetic resin lid sealed with antifreeze is left overnight in a thermostatic chamber maintained at -18 ° C and taken out of the thermostatic chamber immediately before each test.

  -From the height considering the specific gravity difference between the original contents and the sealed antifreeze liquid, the unsealed synthetic resin lidded container is freely dropped based on a predetermined posture. At that time, the process of deforming the container with the lid by the impact force when colliding with the ground is photographed with a high-speed camera.

  Next, the contents of the inverted caddy drop test in which the impact of the impact force is exerted on the container with a synthetic resin lid and the analysis contents based on the video taken by the high-speed camera of the deformation process of the container with the lid in the test are explained. To do.

  In this test, as shown in FIG. 2, the synthetic resin lidded container is freely dropped as indicated by the arrow with the lid 20 facing down with the upper surface of the lid body 21 inclined at an angle θ from the horizontal plane HZ. Specifically, for example, free fall is performed so that the diagonal line DL in the cross-sectional structure of the synthetic resin lidded container is substantially orthogonal to the horizontal plane HZ. Thereby, it can be confirmed whether the mechanism which mounts the lid | cover 20 with respect to the container main body 10 is provided with impact resistance, and whether the sealing performance of the synthetic resin lidded container is maintained by extension.

  When the synthetic resin lidded container dropped in such a posture collides with the ground GD, the state viewed from the right side of the lidded container is as shown in FIG. The place where the lands landed is greatly elastically deformed by the impact force caused by the collision, resulting in a crushed shape. At the same time, an impact force (hereinafter referred to as a water hammer force) due to the action of the water hammer by the liquid sealed in the synthetic resin lidded container acts on the lid 20 in the direction of the arrow PR. As a result, the disc-shaped lid body 21 in the lid 20 functions as if it is an elastic membrane, and the central region CL of the lid body 21 is in the direction of the arrow PR by the water hammer force, that is, a container with a synthetic resin lid. Deforms so that it protrudes toward the outside. The point CT is a center point before the lid 20 is elastically deformed. Further, the lid 20 has a rotational force that attempts to open the container with the synthetic resin lid at a portion located opposite to the landing point in the direction of the arrow RT centered on the landing point by the water hammer force. Works.

  Moreover, the state shown by FIG.3 (b) is the state which looked at the aspect of the collision mentioned above from the front of the synthetic resin lidded container.

  A description will be given of a portion where the deformation is remarkable in the lid 20. The point La is a point located on the leftmost side of the connection portion where the lid outer peripheral wall 23 is connected to the lid inner peripheral wall 22, and the point Ra is a point located on the rightmost side of the connection portion, that is, the point La It is a point located at the counter electrode. The point Lb is a point located on the leftmost side of the lower end in the upright state in which the lid 20 is positioned on the upper side in the vertical direction with respect to the protruding end of the lid outer peripheral wall 23 that hits the bottom of the skirt, in other words, the point 20 Rb is a point located on the rightmost side of the protruding end, that is, a point located at the counter electrode of the point Lb. The point Ta is the point farthest from the ground GD among the connecting portions. The point Tb is the point farthest from the ground GD among the protruding ends of the lid outer peripheral wall 23 that hits the bottom of the skirt.

  In the photographing result in the process of deformation of the synthetic resin lidded container, the point Lb was displaced in the radial direction, that is, in the direction of the arrow SHL with respect to the point La with the point La as a fulcrum. Similarly, the point Rb is displaced in the radial direction with respect to the point Ra, that is, in the direction of the arrow SHR with respect to the point Ra. In addition, the displacement amount in the point Lb and the point Rb was equivalent because the synthetic resin lidded container was cylindrical. Further, the main body peripheral wall 12 in the vicinity of the point La and the point Ra was both displaced outward in the radial direction. The points La and Ra are both displaced to the outer side in the radial direction to the same extent as the main body peripheral wall 12.

  Similarly, in the imaging result in the process of deformation of the synthetic resin lidded container, the point Tb was displaced radially outward with respect to the point Ta, that is, in the direction of the arrow EX1 with respect to the point Ta. The main body peripheral wall 12 in the vicinity of the point Ta was deformed in the radial direction, that is, in the direction opposite to the arrow EX1. Note that almost no deformation was observed at the point Ta.

  Next, the deformation mechanism of the synthetic resin lidded container around the points La and Lb (region B) obtained by analyzing the above-described imaging result will be described in detail. In addition, since the deformation mechanism of the container with a synthetic resin lid around the point Rb is the same as the deformation mechanism of the container with the lid around the point Lb (region B), it is omitted.

  As shown in FIG. 4A, the lid main body 21 is deformed in the direction of the arrow PR by the water hammer force. As the lid body 21 is deformed, the point Wb is displaced in the direction of the arrow SHC, that is, inward in the radial direction. The point Wb is a point of the protruding end (lower end in the upright state) of the cylindrical rib 22r that relieves and reinforces the stress concentration of the folded portion 22j of the inner peripheral wall 22 of the lid. The displacement of the point Wb causes the second lid inner peripheral wall 22b to rotate around the point La, and thus the lid outer peripheral wall 23 also rotates in the same direction as the lid inner peripheral wall 22. Thereby, the point Lb is displaced in the direction of the arrow SHL with respect to the point La, that is, inward in the radial direction. However, since the annular rib 14 is formed so as to be separated from the inner peripheral surface 23a of the lid outer peripheral wall 23, the amount of displacement of the point Lb in the radial direction as described above is suppressed.

  On the other hand, since the synthetic resin lidded container is elastically deformed by the impact force caused by the landing, the body peripheral wall 12 in the vicinity of the opening 10e expands in a direction parallel to the ground. Therefore, the main body peripheral wall 12 near the point La is displaced in the direction of the arrow EXB, that is, radially outward. Since the lid outer peripheral wall 23 in the vicinity of the point La is directly pushed out by the main body peripheral wall 12 expanding in this way, the lid outer peripheral wall 23 follows the displacement of the main body peripheral wall 12 and is displaced in the direction of the arrow EXB, that is, radially outward. .

  Next, the deformation mechanism of the synthetic resin lidded container around the points Ta and Tb (region C) will be described in detail.

  As shown in FIG. 4B, the lid body 21 is also deformed in the direction of the arrow PR by the water hammer force again. As the lid body 21 is deformed, the point Wb is displaced in the direction of the arrow SHC, that is, inward in the radial direction. By such deformation of the point Wb and the same mechanism as that described above, the point Tb is displaced in the direction of the arrow SHT with respect to the point Ta, that is, inward in the radial direction.

  By the way, the place opposite to the point Tb is a landing point. Therefore, in the said location, it cannot arise except the elastic deformation by the impact force of landing. For this reason, although the point Lb, the point Rb, and the point Tb are all displaced radially inward with respect to the respective fulcrums by the water hammer force as described above, the displacement of the point Lb and the point Rb is the point Tb. It becomes more dominant than the displacement of. As a result, the radially inward displacement amount of the point Lb and the point Rb is propagated to the point Tb so as to be brought closer to the lid outer peripheral wall 23, and the point Tb is in the direction of the arrow EXT, that is, in the radial direction. Extruded outward. Therefore, the point Tb is displaced in the direction of the arrow EX1, that is, outward in the radial direction by an amount obtained by subtracting the amount of displacement indicated by the arrow SHT from the amount of displacement indicated by the arrow EXT. However, since the displacement amount indicated by the arrow EXT is suppressed by the function of the annular rib 14 as described above, that is, the amount of loosening propagated to the point Tb is suppressed, the arrow EX1 indicates. The amount of displacement is also suppressed.

  On the other hand, the main body peripheral wall 12 in the vicinity of the opening 10e is narrowed in a direction perpendicular to the parallel direction with respect to the ground in order to elastically deform so as to be ablated by an impact force due to landing. Therefore, the main body peripheral wall 12 around the point Tb (point Ta) is displaced in the direction of the arrow SHB, that is, inward in the radial direction. However, the body peripheral wall 12 that is displaced inward in the radial direction in this way is supported by the second cover inner peripheral wall 22b on the inner peripheral surface 12a. And the main body surrounding wall 12 is made hard to displace further to the inner side of radial direction by the leaf | plate spring force which the 1st lid inner peripheral wall 22a produces. Since the main body peripheral wall 12 is displaced in a direction away from the lid outer peripheral wall 23 in the vicinity of the point Ta, the lid outer peripheral wall 23 in the vicinity of the point Ta is not easily affected by the displacement of the main body peripheral wall 12.

  As described above, the body peripheral wall 12 around the point Ta and the point Tb (region C) is displaced inward in the radial direction by the impact force when the synthetic resin lidded container is landed, that is, the annular latching strip. 24 is displaced in a direction to release the hooking of the flange portion 13 by 24. However, the second lid inner peripheral wall 22b supports the main body peripheral wall 12 in the vicinity of the opening 10e from the inner peripheral surface 12a. Further, the support is reinforced by a leaf spring force generated by the first lid inner peripheral wall 22a. Therefore, deformation of the main body peripheral wall 12 in the vicinity of the opening 10e due to impact force is suppressed.

  Further, as described above, the lid main body 21 is deformed so as to protrude to the outside of the synthetic resin lidded container by the water hammer force, and the amount of displacement inward in the radial direction of the points La and Lb is all point Tb. As a result, the point Tb is displaced radially outward, that is, in a direction in which the hooking of the flange portion 13 by the annular hooking strip 24 is also released. However, since the amount of displacement of the points La and Lb inward in the radial direction, that is, the amount of fleshing out is suppressed by the annular rib 14, the amount of displacement of the lid outer peripheral wall 23 in the direction of releasing the latch is suppressed. Is done.

  As a result of photographing the deformation process at the next moment in the state shown in FIG. 3A, the lid main body 21 functioning as an elastic film vibrates as shown in FIG. The region CL was displaced in the direction of the arrow DT, that is, toward the inside of the synthetic resin lidded container. Since the water hammer force continues to act on the lid main body 21 in the direction opposite to the arrow DT, the amount returning toward the inside of the synthetic resin lidded container is the amount protruding to the outside of the lidded container. The amount was less. Therefore, actually, as shown in FIG. 5A, the lid body 21 did not vibrate until it protrudes into the inside of the synthetic resin lidded container, and returned only slightly from the most protruding position.

  The state shown in FIG. 5B is a state where the synthetic resin lidded container shown in FIG. 5A is viewed from the front.

  According to the photographed result, the point Lb was seen to be slightly displaced in the radial direction with respect to the point La, that is, in the direction of the arrow EXL with respect to the point La. Similarly, the point Rb appears to be slightly displaced outward in the radial direction with respect to the point Ra, that is, in the direction of the arrow EXR with respect to the point Ra. Further, the main body peripheral wall 12 in the vicinity of the point Lb and the point Rb has been continuously displaced outward in the radial direction. Both the points La and Ra continued to displace to the outer side in the radial direction as much as the main body peripheral wall 12.

  Further, the point Tb was seen to be slightly displaced in the radial direction with respect to the point Ta, that is, in the direction of the arrow EX2 with respect to the point Ta. The main body peripheral wall 12 in the vicinity of the point Ta was continuously deformed in the radial direction, that is, in the direction opposite to the arrow EX2. Note that almost no deformation was observed at the point Ta.

  Next, the deformation mechanism of the synthetic resin lidded container around the points La and Lb (region D) obtained by analyzing the above-described photographed result will be described in detail. In addition, since the deformation mechanism of the container with a synthetic resin lid around the point Rb is the same as the deformation mechanism of the container with the lid around the point Lb (region D), it is omitted.

  As shown in FIG. 6A, the lid main body 21 vibrates slightly in the direction of the arrow DT as it vibrates. As the lid body 21 is deformed, the point Wb is displaced in the direction of the arrow EXC, that is, radially outward. The displacement of the point Wb causes the second lid inner peripheral wall 22b to rotate around the point La, and thus the lid outer peripheral wall 23 also rotates in the same direction as the lid inner peripheral wall 22. Thereby, the point Lb is displaced with respect to the point La in the direction of the arrow EXL, that is, outside in the radial direction. However, the displacement amount is very small because the return amount of the center region CL is small as described above.

  On the other hand, since the container with the synthetic resin lid is continuously elastically deformed by the impact force caused by the landing, the body peripheral wall 12 in the vicinity of the opening 10e continues to expand in a direction parallel to the ground. Therefore, the main body peripheral wall 12 in the vicinity of the point La continues to be displaced in the direction of the arrow EXB, that is, outside in the radial direction. Since the lid outer peripheral wall 23 in the vicinity of the point La is directly pushed out by the main body peripheral wall 12 expanding in this way, the lid outer peripheral wall 23 follows the displacement of the main body peripheral wall 12 and is displaced in the direction of the arrow EXB, that is, radially outward. .

  Next, the deformation mechanism of the synthetic resin lidded container around the points Ta and Tb (region E) will be described in detail.

  As shown in FIG. 6 (b), the lid body 21 again vibrates slightly in the direction of the arrow DT as shown in FIG. As the lid body 21 is deformed, the point Wb is displaced in the direction of the arrow EXC, that is, radially outward. By such deformation of the point Wb and the same mechanism as that described above, the point Tb is displaced in the direction of the arrow EX2, that is, radially outward with respect to the point Ta.

  On the other hand, the main body peripheral wall 12 in the vicinity of the opening 10e is narrowed in a direction perpendicular to the parallel direction with respect to the ground in order to continue to be elastically deformed so as to be ablated by the impact force caused by the landing. Therefore, the main body peripheral wall 12 around the point Tb (point Ta) continues to be displaced in the direction of the arrow SHB, that is, in the radial direction. However, the body peripheral wall 12 that is displaced inward in the radial direction in this way is supported by the second cover inner peripheral wall 22b on the inner peripheral surface 12a. And the main body surrounding wall 12 is made hard to displace further to the inner side of radial direction by the leaf | plate spring force which the 1st lid inner peripheral wall 22a produces. Since the main body peripheral wall 12 is displaced in a direction away from the lid outer peripheral wall 23 in the vicinity of the point Ta, the lid outer peripheral wall 23 in the vicinity of the point Ta is not easily affected by the displacement of the main body peripheral wall 12.

  As described above, the body peripheral wall 12 around the point Ta and the point Tb (region E) is displaced inward in the radial direction by the impact force when the synthetic resin lidded container is landed, that is, the annular latching strip. 24 continues to be displaced in the direction of releasing the hooking of the flange portion 13 by 24. However, the second lid inner peripheral wall 22b supports the main body peripheral wall 12 in the vicinity of the opening 10e from the inside. Further, the support is reinforced by a leaf spring force generated by the first lid inner peripheral wall 22a. Therefore, deformation of the main body peripheral wall 12 due to the impact force is suppressed.

  Further, as described above, the point Tb is displaced in the radial direction due to the return of the lid main body 21, that is, in the direction in which the hooking of the flange portion 13 by the annular hooking strip 24 is also released. Displace. However, as described above, since the return amount of the lid main body 21 is small, the amount by which the point Tb is displaced radially outward is small.

  By the way, since the location opposite to the point Tb is the landing location, no other than elastic deformation due to the impact force of the landing can occur at the location. For this reason, although the points Lb, Rb, and Tb are all displaced radially outward with respect to the respective fulcrums as the lid body 21 vibrates as described above, the points Lb, Rb The displacement becomes more dominant than the displacement at the point Tb. As a result, the outward displacement amount of the point Lb and the point Rb is propagated to the point Tb so as to be brought close to the lid outer peripheral wall 23, and the point Tb is in the direction of the arrow SHT, that is, in the radial direction. Pushed back inward. Therefore, the latching of the flange portion 13 by the annular latching strip 24 is further difficult to be released.

  As described above, according to the synthetic resin lidded container according to the present embodiment, the effects listed below can be obtained.

  (1) Although the skirt-like lid outer peripheral wall 23 bends inward in the radial direction by the water hammer force, the amount of bending is suppressed by the annular rib 14. Therefore, even if the influence of the above-described bending is brought close to the lid outer peripheral wall 23, the amount by which the lid outer peripheral wall 23 bends radially outward is also suppressed. Further, the main body peripheral wall 12 in the vicinity of the opening 10 e of the container main body 10 is supported by the lid inner peripheral wall 22 from the inside. Therefore, the deformation | transformation to the inner side of the radial direction of the main body surrounding wall 12 in the opening part 10e vicinity is suppressed especially. For this reason, it is possible to give the lid outer peripheral wall 23 flexibility so as to allow the above-described leaning and to suppress the displacement amount of the main body peripheral wall 12 in the vicinity of the lid outer peripheral wall 23 and the opening 10e. And it becomes possible to provide the container with a synthetic resin lid | cover which improved impact resistance and ensured sealing performance.

  (2) The annular rib 14 is provided so as to be separated from the inner peripheral surface 23a of the lid outer peripheral wall 23, and is not hooked by the inner peripheral surface 23a. For this reason, the lid 20 can be attached to the container body 10 without resistance.

  (3) The annular rib 14 is provided closer to the bottom wall 11 than the rib uppermost surface PL3 equidistant from the outermost wall lowermost surface PL2 and the flange surface PL1 in the height direction of the container body 10. The annular rib 14 is provided on the opening 10e side with respect to the rib lowermost surface PL4. As a result, the annular rib 14 effectively suppresses the amount by which the lid outer peripheral wall 23 is bent so that the lid outer peripheral wall 23 bends inward in the radial direction. It is possible to make it difficult to bend outward in the radial direction.

  (4) The lid inner peripheral wall 22 has a V-shaped or U-shaped cross section in which the first lid inner peripheral wall 22a, the folded portion 22j, and the second lid inner peripheral wall 22b are arranged in this order from the inside of the lid 20. It is formed to become. The folded portion 22j is formed so as to protrude into the internal space of the synthetic resin lidded container in a state where the lid 20 is mounted on the container body 10. As a result, the leaf spring force of the first lid inner peripheral wall 22a acts on the second lid inner peripheral wall 22b via the folded portion 22j. Therefore, it is possible to give the lid inner peripheral wall 22 an elastic force that supports the main body peripheral wall 12 so as to expand from the inside. And it becomes possible to further suppress the displacement amount of the main body peripheral wall 12 in the vicinity of the opening 10e.

(5) The folded portion 22j has a cylindrical shape that protrudes into the inner space of the container with a synthetic resin lid with the lid 20 attached to the container body 10 over the entire circumference of the protruding end (lower end in the upright state). Ribs 22r are added. Therefore, it is possible to relax and reinforce the stress concentration of the folded portion 22j.
(Modification)
In addition, the said embodiment can also be implemented with the following aspects.

  As shown in FIG. 7, the outer peripheral surface 12 b of the main body peripheral wall 12 has a distance D <b> 3 in a region closer to the bottom wall 11 than the outermost wall lowermost surface PL <b> 2 and radially outward from the annular rib 14 over the entire periphery. An auxiliary annular rib 15 that protrudes only by a distance may be further provided. Further, the auxiliary annular ribs 15 may be provided not only in a single layer but also in a double triple.

  Even if it does in this way, the effect according to said (1)-(5) can be acquired. At the same time, as shown in FIG. 8, even when the synthetic resin lidded container collides with the ground GD in a state of being laid down, the auxiliary annular rib 15 acts as a kind of stopper, and the shock is buffered. At the same time, the lower end of the lid outer peripheral wall 23 can be prevented from being excessively pushed inward in the radial direction, and the lid outer peripheral wall 23 can be hardly broken.

  -In above-mentioned embodiment, although the folding | returning part 22j was reinforced by providing the cylindrical rib 22r, not only this but the structure which does not provide the cylindrical rib 22r may be sufficient. That is, for example, the rigidity of the folded portion 22j may be ensured by making the thickness of the folded portion 22j thicker than the thickness of the first lid inner peripheral wall 22a and the second lid inner peripheral wall 22b. In short, any structure that can ensure the rigidity of the folded portion 22j may be used.

  In the above embodiment, the lid inner peripheral wall 22 has the first lid inner peripheral wall 22a, the folded portion 22j, and the second lid inner peripheral wall 22b arranged in this order from the inside of the lid 20, or a V-shaped section. However, the present invention is not limited to this, and it may be formed in a single cylindrical shape in which only the second lid inner peripheral wall 22b is disposed.

  In the above embodiment, the annular rib 14 is closer to the bottom wall 11 than the rib uppermost surface PL3 in the inner peripheral surface 23a of the skirt-shaped outer peripheral wall 23 with the lid 20 mounted on the container body 10. Is provided. However, the present invention is not limited to this, and the annular rib 14 may be provided so as to face the inner peripheral surface 23a in a region closer to the opening 10e than the rib uppermost surface PL3. Even if it does in this way, the effect according to said (1)-(5) can be acquired.

  In the embodiment described above, the outermost wall lowermost surface PL2 is disposed below the rib lowermost surface PL4 in a state where the lid 20 is mounted on the container body 10, but this However, the outermost wall lowermost surface PL2 may be disposed so as to be located above the rib lowermost surface PL4.

  In the above embodiment, the distance D2 is preferably set to 0 mm <D2 ≦ 2 mm over the entire circumference of the inner peripheral surface 23a in a state where the lid 20 is mounted on the container body 10, but the present invention is not limited to this. Absent. The distance D2 may disappear at a part of the inner peripheral surface 23a and may contact the protruding end of the annular rib 14. In short, the lid outer peripheral wall 23 can be pulsated to ensure the flexibility of the lid outer peripheral wall 23 at the time of landing, and the lid 20 is prevented from being detached from the container body 10 so as not to cause excessive meat gathering. I can do it.

  Even if it does in this way, the effect according to said (1)-(5) can be acquired. In addition, since it is not necessary to strictly manage the projecting amount of the annular rib 14 and the diameter of the inner peripheral surface 23a, the manufacturing process can be simplified and the manufacturing cost can be reduced. become.

  The container body 10 may be hooked with the lid 20 at a plurality of locations. Further, the annular ribs 14 may be provided not only as a single layer but also as a double layer or more.

  In the above embodiment, in the container with a synthetic resin lid, the opening 10e is in close contact with the lid 20 via the sealing material RG, but the present invention is not limited to this. If the synthetic resin lidded container is sealed by the opening 10e being in direct contact with the lid 20, the sealing material RG may be omitted.

  -In the said embodiment, although the content sealed by the container with a synthetic resin lid | cover was liquid, not only this but the granule etc. which have fluidity | liquidity like sand may be sufficient. In short, anything that can be sealed in a synthetic resin container is acceptable.

  In the above embodiment, the lid main body 21 may be provided with a takeout port that allows the contents sealed in the synthetic resin covered container to be taken out without removing the lid 20 from the container main body 10. However, it may not be provided.

  The container main body and the lid are each formed by integral molding, and a container with a synthetic resin lid that can enhance the sealing performance can be provided.

  DESCRIPTION OF SYMBOLS 10,60 ... Container main body, 10e, 60e ... Opening part, 11, 61 ... Bottom wall, 12, 62 ... Main body peripheral wall, 12a, 23a ... Inner peripheral surface, 12b ... Outer peripheral surface, 13 ... Flange part, 14 ... Annular rib 15 ... auxiliary annular ribs, 20, 70 ... lids, 21,71 ... lid bodies, 22,72 ... lid inner circumferential walls, 22a ... first lid inner circumferential walls, 22b ... second lid inner circumferential walls, 22j ... folded portions, 22r ... cylindrical ribs, 23, 73 ... lid outer peripheral wall, 24 ... annular latching strip, 63a ... first annular latching strip, 63b ... second annular latching strip, 63c ... third annular latching strip, 74a ... 1st annular latching strip, 74b ... 2nd annular latching strip, 74c ... 3rd annular latching strip, CL ... center area, DL ... diagonal, D1, D2, D3 ... distance, GD ... ground, HZ ... Horizontal plane, PL1 ... flange surface, PL2 ... outermost wall bottom surface, PL3 ... rib top surface, PL4 ... rib top surface Surface, La, Lb, Ra, Rb, Ta, Tb, Wb ... points, P4 ... nadir, RG ... sealing material.

Claims (5)

In a container with a synthetic resin lid made of a synthetic resin container body and a synthetic resin lid,
(1) The container body includes a cylindrical main body peripheral wall, a bottom wall that closes a lower end of the main body peripheral wall, an opening at an upper end of the main body peripheral wall, a flange portion at an outer edge of the opening, An annular rib on the outer peripheral surface of the main body peripheral wall, and
(2) The lid includes a disc-shaped lid main body, a lid inner peripheral wall along the entire circumference of the outer peripheral portion of the lid main body, and a skirt that surrounds the entire circumference of the lid inner peripheral wall while being separated from the lid inner peripheral wall. A ring-shaped lid outer peripheral wall , and an annular latching strip formed on the inner circumferential surface of the lid outer circumferential wall and projecting toward the center of the lid so as to be latchable from below with respect to the flange portion ,
(3) The annular rib is located above the position of the lower end of the lid outer peripheral wall when viewed in cross section, and the main body peripheral wall and the lid inner peripheral wall overlap in a state where the lid is attached to the container main body. The distance D2 between the protruding end of the annular rib and the inner peripheral surface of the lid outer peripheral wall satisfies 0 mm <D2 ≦ 2 mm and is not hooked by the inner peripheral surface of the lid outer peripheral wall. ,
In a state where the lid is mounted on the container body, a plane including a portion of the flange portion that is hooked by the annular hook is a flange surface.
In a state where the lid is attached to the container body, a plane including the lower end of the lid outer peripheral wall is the outermost wall lowermost surface,
The container with a synthetic resin lid , wherein the annular rib is provided below a center position in a vertical direction between the flange surface and the lowermost surface of the outer peripheral wall when viewed in cross section . The lid inner peripheral wall comprises a first lid inner peripheral wall and a second lid inner peripheral wall,
The inner peripheral wall of the first lid and the inner peripheral wall of the second lid constitute a folded portion that protrudes into a space that is inside the container main body in a state where the lid is attached to the container main body,
The container with a synthetic resin lid according to claim 1 , wherein the inner peripheral wall of the second lid is in contact with the inner peripheral surface of the container main body.   The inner wall of the lid has a V-shape or a U-shape with the folded portion as a bending point when viewed in cross section.
  A container with a synthetic resin lid according to claim 2. 4. The synthetic resin according to claim 2 , wherein the folded portion has a cylindrical rib that protrudes into a space inside the container body in a state where the lid is attached to the container body over the entire circumference of the protruding end. Container with lid. On the outer peripheral surface of the peripheral wall of the main body, the annular rib extends over the entire circumference in a region closer to the bottom wall than in a region that is surrounded by the outer peripheral wall of the lid in a state where the lid is attached to the container main body. The container with a synthetic resin lid as described in any one of Claims 1-4 in which the auxiliary | assistant cyclic | annular rib which protrudes on the outer side of radial direction is further provided.

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