JPH0531082Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to a structure for fitting a container body and a lid of a closed container, and can be applied to a plastic closed container generally referred to as a pail can. [Prior art] Plastic pails have traditionally had advantages over metal ones, such as being lighter, having greater strength when dropped, being less deformed by impact, and being free from rust and corrosion. , used as containers for petroleum products, paints, medicines, etc. As a conventional technology for such a closed container, for example,
175044 is known. The lid of such a conventional airtight container is provided with an inner flange and an outer flange concentrically extending downwardly from the outer periphery, and a wedge-shaped claw portion is formed on the inner surface of the outer flange. On the other hand, the upper opening edge of the container body is curved outward and downward, and this portion serves as a curved portion. When tightening the lid, the curved portion is fitted between the inner flange and the outer flange, the lid is placed over the container body, the lower end of the curved portion is engaged with the wedge-shaped claw portion, and the lid is tightened. irremovably sealed. [Problem to be solved by the invention] In such a conventional sealed plastic container, the space length A at the base of the wedge-shaped claw, the space length B at the tip of the wedge-shaped claw, and the width dimension C of the curved part before fitting are as follows. It had been molded without much attention. For this reason, the space length B at the tip of the wedge-shaped claw is larger than the width C of the curved part, making it easy for the lid to come off when the lid is dropped, or being quite small compared to the width C of the curved part, making it difficult to close the lid. Sometimes too much stress,
There was a problem that the amount of deformation of the lid was large. In addition, since the space length A at the base of the wedge-shaped claw is larger than the width C of the curved part, the lid may not fit properly, resulting in a decrease in sealing performance, or because it is considerably smaller than the width C of the curved part, There was a problem that the amount of deformation of the lid was large. Furthermore, when the inner flange of the lid is press-fitted into the container body while the lid is being closed, as in the above-mentioned Utility Model Application Publication No. 59-175044, the air inside the container body is compressed, making it difficult to close the lid. Another problem was that the lid curved upward and expanded. In order to solve the above problems, the present invention clarified the appropriate range of A/C and B/C through experiments, making it difficult for the lid to come off even in the event of a fall, and reducing the amount of deformation of the lid. Another object of the present invention is to provide a fitting structure for a closed container that allows the lid to be easily closed and prevents the lid from bending and expanding. [Means for Solving the Problem] Therefore, in the present invention, a curved portion is provided at the upper opening edge of the container body, an inverted U-shaped space is provided at the outer periphery of the lid that covers the container body, and the inverted U-shaped space is A wedge-shaped claw is formed in the inverted U-shaped space, and the curved part is fitted into the inverted U-shaped space to cover the container body, thereby locking the curved part to the wedge-shaped claw. In the fitting structure of a sealed container, when the ratio of the width C of the curved portion before fitting to the space length A of the base of the wedge-shaped claw portion is A/C, 0.6≦
When A/C≦1.0, and the ratio of the width C of the curved portion to the space length B at the tip of the wedge-shaped claw portion is B/C, 0.4≦B/C≦0.7, and Before the container body and the lid are completely fitted together, that is, before the lid is closed, the inner flange and the outer flange that form an inverted U-shaped space are designed to form an inverted U-shaped space inside the container body. The groove is characterized in that a groove is formed which communicates with the outside of the container through the container body and is shielded by the container body when the container body and the lid are fitted together, that is, after the lid is closed. In this invention, 0.85≦A/C≦0.95,
It is preferable that 0.45≦B/C≦0.6. [Operation] In order to close the lid in the present invention, the curved portion of the upper edge of the container is fitted into the inverted U-shaped space on the outer periphery of the lid, and the lid is pressed. At this time, the lid slides while being pressed against the inner surface of the container body, and the wedge-shaped claw portion slides while being pressed against the curved portion. At this time, as described above, since 0.4≦B/C≦0.7, the force for pressing the lid is not so large, and the deformation of the lid is also small. The lid is further pressed to lock the lower end of the curved portion to the base of the wedge-shaped claw portion, so that the lid is irremovably attached to the container body. At this time, as mentioned above, 0.6≦A/C
Since ≦1.0, the curved portion is biased inward, resulting in a stronger fit and high sealing performance. Furthermore, while the lid is being closed, the inside of the container main body is communicated with the outside of the container via an inverted U-shaped space due to the grooves formed on the inner and outer flanges of the lid, so the air inside the container is Since the air is released to the outside and the air pressure inside the container does not increase, the lid can be easily closed and the lid is prevented from bending and expanding. Furthermore, after the lid is closed, the groove is covered by the container body, communication between the container body and the outside of the container is cut off, and the container is hermetically sealed. [Example] Figure 1 shows a pail can with a capacity of 20 according to an example of the present invention, in which both the container body 1 and the lid 2 are made of polyethylene (PE), polypropylene (PP), etc. Made of molded plastic. The shape of the container body 1 is an inverted truncated cone whose diameter gradually decreases as it extends downward. The upper outer peripheral surface has a small diameter ring-shaped rib 3 for reinforcement,
4 and a large-diameter ring-shaped rib 5 are formed, and a raised portion 7 for engaging the end of the handle 6 is also provided. The upper opening edge of the container body 1 is curved outwardly and downwardly, so that the upper opening edge forms a curved portion 8. The top plate 9 of the lid 2 is provided with two steps 10 and 11, and the diameter of the upper step 11 is equal to that of the container body 1.
is set equal to the diameter of the bottom edge of the lid 2.
After covering the container body 1, a plurality of pail cans can be stacked vertically. Further, the top plate 9 is provided with a cylindrical part 12 used when dispensing the contents of the pail can, and the bottom of this cylindrical part 12 is closed with a bottom plate 13, which is inserted through a thin wall part 14. It is combined with the top plate 9. The cylindrical portion 12 is normally covered with a cap (not shown). An inner flange 15 and an outer flange 16 that protrude downward are provided concentrically on the outside of the top plate 9, that is, on the outer periphery of the lid 2. It is larger than the inner diameter, and when the lid 2 is placed on the container body 1, the inner flange 15 is press-fitted into the upper end opening of the container body 1. The specific shapes of the inner flange 15 and the outer flange 16 are shown in FIGS. 2 and 3, and the outer flange 1
6 is formed with a wedge-shaped claw portion 17 that gradually projects inward as it extends upward, and this claw portion 17
The base space length A, that is, the ratio of the horizontal distance A between the base of the claw portion 17 and the inner flange 15 to the horizontal width dimension C of the curved portion 8 of the container body 1 A/
C is 0.6≦A/C≦1.0, preferably 0.85≦
A/C≦0.95. Space length B at the tip of the claw portion 17, that is, horizontal distance B between the upper end of the claw portion 17 and the inner flange 15
and the horizontal width dimension C of the curved portion 8 B/C
is 0.4≦B/C≦0.7, preferably 0.45≦
B/C≦0.6. Claw portion 1 having the above shape
7 is provided over the entire circumference of the outer flange 16. A plurality of, for example eight, grooves 18 are provided on the outer surface of the inner flange 15 at equal intervals in the circumferential direction, and the grooves 18 extending in the vertical direction reach the lower end of the inner flange 15. Recesses 19 are provided on the upper outer surface of the outer flange 16 at positions corresponding to these grooves 18, and recesses 20, which are grooves, are provided in the wedge-shaped claw portion 17 at the same positions in the circumferential direction as the recesses 19. There is. Therefore, the wall thickness of the outer flange 16 in this portion is reduced. A small plate-shaped rib 21 is provided between the inner flange 15 and the back surface of the top plate 9, and this rib 21
are provided in large numbers at equal intervals over the entire circumference of the inner flange 15. Therefore, the inner flange 15, the two steps 10, 11 of the top plate 9, and the ribs 21 form the periphery of the inner flange 15 into a box-shaped cross section, and the strength of this portion is increased. Between the inner flange 15 and the outer flange 16 is an inverted U-shaped space 22 whose upper part is closed by the back surface 2A of the lid 2 and whose lower part is open only, and a gasket 23 is fitted into this space 22. . This packing 23 has a circular cross section and is in the shape of a ring that is continuous over the entire circumference of the lid 2. The packing 23 is made of a rubber-like elastic material that has been expanded to about 2 to 100 times the size, and the rubber-like elastic material includes nitrile rubber (NBR), styrene-butadiene rubber (SBR), butyl rubber (IIR). , fluorocarbon rubber (FPR), silicone rubber, chloroprene rubber, natural rubber, etc. are used. The groove 18 provided on the outer surface of the inner flange 15
shall extend upwardly from the upper end of the wedge-shaped claw portion 17, and the length of the groove 18 in the vertical direction is such that the upper end 18A of the groove 18 extends upward from the upper end of the container body 1 when the lid is closed as shown in FIG. Make sure that it is closed by the inner surface of the upper part. Next, we will discuss the effect. After storing predetermined items such as chemicals, paint, food, and petroleum products inside the container body 1, the lid 2 is placed over the upper opening of the container body 1, and the curved portion 8 of the container body 1 is closed. It fits between the inner flange 15 and outer flange 16 of 2, and presses the lid 2 with a large load. As a result, the outer surface of the inner flange 15 slides while being pressed against the inner surface of the container body 1, and the wedge-shaped claw portion 17 on the inner surface of the outer flange 16 slides while being pressed against the tip of the curved portion 8. As mentioned above, the box-shaped periphery of the flange 15 has high strength, so the inner flange 15 does not bend inward, the outer flange 16 bends outward, and the upper end of the wedge-shaped claw part 17 is bent toward the curved part 8. At the same time as the outer flange 16 reaches the same height as the lower end 8A, its restoring force causes the outer flange 16 to return inward, whereby the lower end 8A of the curved portion 8 is locked to the claw portion 17, and the lid 2 is attached to the container body 1 irremovably. be crowned. At this time, the gasket 23 is compressed and deformed by the curved portion 8 and the back surface 2A of the lid 2, and the lid 2 is compressed and deformed by the gasket 23.
3 to be hermetically sealed. Since the packing 23 is made of a foamed elastic material as described above, the compression ratio can be increased and the sealing effect can be increased. When the lower end 8A of the curved part 8 is locked by the claw part 17 and the lid is closed, the horizontal width dimension C of the curved part 8 and the space length A at the base of the claw part 17 become equal, as shown in FIG. . Before closing the lid, as mentioned above,
0.6≦A/C≦1.0 (preferably 0.85≦A/C≦
0.95), so after closing the lid,
The curved portion 8 is urged horizontally inward by the outer flange 16. According to this embodiment, the ratio A/C between the spatial length A of the base of the wedge-shaped claw portion 17 and the width dimension C of the curved portion 8 at the upper end of the container body 1 is set to 0.6≦A/C≦1.0, Desirably, 0.85≦A/C≦0.95, so
The curved portion 8 is urged inward in the horizontal direction by the outer flange 16. Therefore, the fit between the lid 2 and the container body 1 becomes stronger, and the lid 2 becomes difficult to come off even when dropped. In addition, the space length B at the tip of the wedge-shaped claw portion 17 and the curved portion 8
Since the ratio B/C with the width dimension C of is set to 0.4≦B/C≦0.7, preferably 0.45≦B/C≦0.6,
When the lid is closed, defects such as lid cracking are less likely to occur, and the lid 2 is less likely to come off when dropped. Further, in this embodiment, as described above, the inner flange 15 of the lid 2 is press-fitted into the upper end opening of the container body 1,
Therefore, when the lid 2 is in the middle of closing, the lid 2
Even if the air inside the container body 1 is compressed by entering the inside of the container body 1, the air inside the container body 1 escapes to the space 22 through the groove 18, and further flows from the space 22 through the recess 20 to the outside. Therefore, the air pressure inside the container body 1 does not increase. For this reason, the lid can be easily closed with a relatively small force, and the lid 2 does not curve upward and expand when the lid is closed, resulting in stable and good stacking properties when multiple plastic pail cans are stacked vertically. It can be made into Further, as described above, the inner flange 15 is press-fitted into the upper end opening of the container body 1, and in addition, even after the lid 2 is placed on the container body 1, the inner flange 15 remains in the box-shaped shape. The connection state of the lid 2 to the container body 1 is improved because the curved portion 8 is urged horizontally inward by the outer flange 16, that is, toward the inner flange 15. is strong,
Therefore, even if the lid 2 or the container body 1 is subjected to impact force, load, etc., the sealing performance of the packing 23 is reliably maintained, and a high degree of airtightness is ensured by the packing 23. Further, as shown in FIG. 3, when the lid is closed, the upper end 18A of the groove 18 is closed by the upper inner surface of the container body 1, and the inside of the container body 1 and the space 22 are closed.
Since the communication between the two is cut off, the airtight pressure also increases. In addition, when taking out the contents stored inside the container body 1 in small quantities, after removing the cap covering the cylindrical part 12, the bottom plate 13 of the cylindrical part 12 is struck to cut the bottom plate 13 from the thin part 14. In addition, when removing the lid 2 itself from the container body 1, apply a tool such as a screwdriver to the recess 19,
Hit this tool with a hammer or the like to remove the outer flange 16.
By making a hole in the upper part of the flange 16 and enlarging this hole to the recess 20, the outer flange 16 is cut vertically, and the engagement between the claw part 17 and the lower end 8A of the curved part 8 is released. Next, the experimental results will be explained. This experiment was conducted on a sealed container in which the container body 1 and the lid 2 were separately molded by injection molding. The material of this container body 1 has a density of 0.961 g/cm ³ and MI
High-density polyethylene (HDPE) with a melt index of 5.5 is used, and the material for the lid 2 has a
High density polyethylene with an MI of 6.5 at 0.955 g/cm ³ was used. The outer diameter of the inner flange 15 of the lid 2 is 309 mm, and the inner diameter of the upper opening of the container body 1 is 308 mm.
The thickness of the lid 2 was 2.5 mm. In addition, as shown in Table 1, in the spatial length A of the base of the wedge-shaped claw 17, the spatial length B of the tip of the wedge-shaped claw 17, and the width dimension C of the curved part 8 at the upper end of the container body 1,
Container bodies 1 and lids 2 having various A/C and B/C values were molded. The molded lid 2 was covered with a foamed rubber gasket 23 as a sealing material to form a lid for the airtight container. A container body 1 is filled with 20 g of water and the lid 2 is placed on the container body 1 to form a sealed container, and a plurality of water-containing sealed containers are manufactured,
A lid cracking test when the lid was closed, a drop test, and the amount of deformation of the lid were measured. These test methods are as follows. Lid cracking test when closing the lid...We checked to see if the lid would crack when closing. Table 1 shows the number of broken lids when 20 lids were closed. Drop test: Drop 20 sealed containers from a height of approximately 1 meter with the lid side diagonally downward, and determine the height at which 50% or more of the water in the sealed container begins to flow out if the lid 2 comes off when dropped. Ta. Measurement of the amount of deformation of the lid...The average value of the maximum amount of deformation due to wavering when 20 lids 2 were closed was determined. The test results are shown in Table-1.

[Effect of idea]

According to the present invention, it is possible to reduce the possibility of the lid coming off or cracking the lid of a closed container when the container is dropped, the amount of deformation of the lid can be reduced, the lid can be easily closed, and the lid can be prevented from bending and expanding.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a plastic pail can according to an embodiment of the present invention, and FIGS. 2 and 3 are enlarged sectional views showing the front and back when the lid is covered. 1... Container body, 2... Lid, 2A... Back side, 8
...Curved portion, 8A...Lower end, 15...Inner flange, 16...Outer flange, 17...Wedge-shaped claw portion,
22... Space, 23... Packing, A... Space length at the base of the wedge-shaped claw, B... Space length at the tip of the wedge-shaped claw, C... Width dimension of the curved part.

Claims (1)

[Claims for Utility Model Registration] A curved portion is provided at the upper opening edge of the container body, an inverted U-shaped space is provided at the outer periphery of the lid that covers the container body, and a wedge-shaped claw portion is provided in this inverted U-shaped space. , the curved portion is fitted into the inverted U-shaped space, and the curved portion is locked by the wedge-shaped claw portion, wherein the width of the curved portion before fitting is When the ratio of the dimension C to the space length A of the base of the wedge-shaped claw portion is A/C, 0.6≦A/C≦1.0, and the width dimension C of the curved portion and the space length B of the tip of the wedge-shaped claw portion When the ratio of B/C to Before fitting, a groove is formed which communicates the inside of the container body with the outside of the container via an inverted U-shaped space, and which is shielded by the container body when the container body and lid are fitted. The structure of the fitting part of a sealed container is characterized by: