JP3528262B2 - Airtight container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight container made of expanded synthetic resin for storing fruits and vegetables, seafood and the like.
More specifically, the inside air is affected by the outside air through the joint between the container body and the lid, or the cold air or heat flows out to the outside. The present invention relates to an airtight container capable of reliably preventing the leakage of air.

[0002]

2. Description of the Related Art An airtight container made of foamed synthetic resin of this type is
The fruits and seafood are stored in the inside, which is pre-cooled in a vacuum chamber, a differential pressure chamber, or a refrigerator or a refrigerating room, or the fruits and vegetables are stored inside together with ice, a cold storage material, and the like. By closing the lid in an airtight state, it can be stored in a refrigerated state or can be put into circulation. Conventional airtight containers are affected by outside air inside the container through the joint between the container body and the lid, or the cold air or heat leaks to the outside, or the liquid content or smell of the stored contents In order to prevent the container from leaking to the outside, a convex strip is provided on one side of the joint between the container body and the lid, and a concave strip is provided on the other side to ensure that the inside and outside of the container are mated with the concave and convex fitting relationship between the two. It is shut off to keep it airtight.

However, when the concave and convex fitting portions are simply provided on the container body and the lid body to provide an airtight state, the air in the container body or the air in the groove is compressed when the lid is closed, and the compressed air Due to the repulsive force, it is difficult to smoothly perform the lid closing work, and thus it is difficult to mechanize the lid closing work. In addition, after the lid is closed, there is a problem that the lid is lifted from the container body due to the internal pressure, or the container is deformed due to the internal pressure and the airtight state cannot be maintained.

Therefore, Japanese Utility Model Laid-Open No. 1-107561 discloses a device of an airtight container which solves the above-mentioned problems related to the increase in internal pressure when the lid is closed. This airtight container is provided with a ridge on one side of the joint between the container body and the lid and a ridge on the other side, and from the outer surface of the container body or the lid to the tip of the ridge or the bottom of the groove. A through hole is formed toward the inside of the container, and when the lid is closed, the air in the groove is released to the outside through the through hole to prevent compressed air from remaining in the groove, and the air in the container. By providing a recess communicating from the container body to the recess, the air in the container body that is compressed when the lid is closed is discharged to the outside from the recess through the projection or the through hole of the recess and the container is released. It prevents the rise of the internal pressure, solves the problems associated with the rise of the internal pressure, and enables mechanization of the lid work.

By the way, as an airtight fitting structure formed at the joint between the container body and the lid, for example, as shown in FIG. 9, both side surfaces are perpendicular to the upper end surface of the side wall a of the container body A. There is a so-called "vertical fitting" in which a ridge x is provided and a fitting concave ridge y for fitting with the fitting convex ridge x is provided on the lower surface of the lid B. However, in such a simple vertical fitting, since there is no vertical locking structure between the fitting convex strip x and the fitting concave strip y, the vertical opening force F ₁ is small.
Further, since the force F ₂ for opening the outer wall portion b of the concave line y to open the lid (hereinafter referred to as "open leg opening force") F ₂ is also small, the lid is easy to open.
Therefore, in order to further strengthen the fitting relationship between the two and maintain a reliable airtight state, instead of just vertical fitting, as shown in FIG. A portion is formed so that the front end side is wider than the base end side, and the fitting concave line y has a width of the opening edge narrower than the width inside the concave line according to the shape of the fitting convex line x. "Double-sided mating" was proposed. The convex strip x and the concave strip y of this double-sided fitting have a large fitting strength because the convex portions on both sides of the convex strip x serve as vertical locking portions, and the vertical opening force F ₁ and the opening leg opening lid are opened. Both forces F ₂ are large and have excellent airtightness. In the case of this double-sided fitting,
From the viewpoint of airtightness, the convex strip x may be provided on either the container main body A or the lid B, and the concave strip y may be provided on either of them, but in recent years, from the viewpoint of economic efficiency, the wall of the foam synthetic resin container is formed. There is a tendency to make the thickness as thin as possible and rationalize the material cost as much as possible. However, when the protrusions are formed on both sides of the tip of the ridge x to make the tip side wider than the base end side, the ridge x is provided on either the container body A or the lid B. ,
It is necessary to widen the width of the joint surface between the container body A and the lid body B, and thus the wall thickness of the side wall a of the container body A is inevitably thick. Moreover, when the protrusions are formed symmetrically on both sides of the tip of the ridge x as described above, there is a problem that the undercut portion of the mold is large during molding and it is difficult to remove the molded product.

Therefore, for example, as shown in FIG. 11 and FIG.
So-called "single-sided fitting" in which a protrusion is provided on only one side of the ridge x
Was proposed. In the case of this one-sided fitting, the undercut is only one surface of the convex strip x, and the formability is not much lower than that of the simple vertical fitting, and the wall thickness of the side wall a is thin, but the two-sided fitting is possible. In comparison, the vertical opening force F ₁ and the leg opening force F ₂ are both inferior.

[0007]

Therefore, in the present invention, in view of the problems in the conventional airtight container as described above, even if the wall thickness is thin, the fitting strength when the lid is closed is large and the airtight state is reliably maintained. In addition, it is easy to mold and the material cost can be rationalized, and the pressure inside the container is prevented from rising when the lid is closed.
Eliminating the problems associated with the rise in internal pressure, facilitating lid closing work,
It is intended to provide an airtight container that enables mechanization of the lid work.

[0008]

In order to achieve the above object, an airtight container according to the present invention comprises a container body made of foam synthetic resin and a lid body, and the inner peripheral side of an upper end surface of a side wall of the container body. Further, an upward fitting convex strip is provided around the whole circumference or a part thereof in the circumferential direction, and a fitting lower surface corresponding to the fitting convex strip is fitted to the lower surface of the lid body which is joined to the upper end surface of the side wall of the container body when the lid is closed. A concave line is provided around one side of the fitting convex line and the corresponding concave line.
The upper part is formed in a substantially S-shape protruding to the outside and serves as a main locking part.
And, the other side is formed in a substantially vertical plane, the said vertical face of the vertical sides of the vertical sides and the fitting concave of the fitting convex as the auxiliary engagement portion
The locking projection is formed on one side and the locking projection on the other side.
Forming a locking recess that engages with the
Remains flat, and the top of the locking protrusion of the auxiliary locking part is
A part is formed at a position lower than the top of the convex part of the main locking part .

[0009]

[0010]

[0011]

[0012]

Further, when the locking projection is provided as the auxiliary locking part, it is preferable that the height of the locking projection is about one third of the height of the projection of the main locking part. .

[0014]

The airtight container as described above is preferably provided with an exhaust hole communicating from the bottom surface of the mating groove to the outer surface of the lid.

Further, the exhaust hole is formed with a ventilation groove communicating with the inside of the container on the joint surface of the fitting convex line and the fitting concave line,
An exhaust hole communicating with the outer surface of the container may be formed at an appropriate position of the lid body or the container body.

[0017]

The airtight container according to the present invention is constructed as described above, and contains fruit and vegetables and seafood inside the container body, which is placed in, for example, a vacuum chamber, a differential pressure chamber, a refrigerator or a refrigerating room. Pre-cool, or store fruits and vegetables with ice, cold storage material, etc. inside the container main body, and cover the container main body with the fitting convex ridge and the concave fitting of the lid Depending on the combination, they can be stored in an airtight state in a refrigerated state, or in a refrigerated state or in a frozen state for distribution.

Next, the operation of the airtight fitting structure by the fitting projection of the container body and the fitting recess of the lid will be described with reference to the accompanying drawings. In the airtight container of the present invention, for example, FIG.
As shown in FIG. 3, the fitting projection 4 provided on the upper end surface of the side wall 3 of the container body 1 and the fitting recess 8 provided on the lower surface of the lid body 2 are formed on the outer peripheral surface side of the fitting projection 4. The convex portion 5 as the main locking portion engages with the concave portion 19 in the fitting concave portion 8 and, on the inner peripheral surface side, serves as an auxiliary locking portion formed on the vertical surface of the fitting convex portion 4. The engaging projection 10 formed on the engaging recess 8 in the engaging recess 6
By engaging with, the fitting convex strip 4 and the fitting concave strip 8 are firmly fitted. In this fitting structure, the fitting convex strip 4 and the fitting concave strip 8 are vertically engaged with each other by the main locking portion and the auxiliary locking portion on both sides thereof, as shown in FIG. The vertical opening force F ₁ shown is the same as the vertical fitting shown in FIG.
It is larger than the case of the conventional single-sided fitting shown in Fig. 1, and as shown in Fig. 1 (b), it is retained at the main retaining portion even when the outside of the lid 2 is lifted upward. In addition to the force, the locking concave portion 6 and the locking convex portion as auxiliary locking portions formed on the vertical inner surface
10 and 10 are engaged with each other to act to prevent the lid body 2 from coming off upward, and have a large leg opening force F ₂ compared to simple vertical fitting or single-sided fitting, which is highly airtight. Become. The height H ₂ of the convex portion 5 as the main locking portion and the height H ₁ of the locking convex portion 10 as the auxiliary locking portion are the same as the height H of the convex portion 9 of the auxiliary locking portion. it is preferred that the ₁ and about 3 minutes about one high H ₂ of Omogakari stop portion. If the auxiliary locking portion H ₁ has such a height, it has sufficient locking strength as the auxiliary locking portion and, at the same time, there is no problem with die cutting during molding.

Further, as shown in FIG. 2, a convex portion 5 and a concave portion 19 are formed on the inner peripheral surface side of the fitting convex ridge 4 and the fitting concave ridge 8 to serve as a main locking portion and the outer circumference. Also when the locking concave portion 6 and the locking convex portion 10 as the auxiliary locking portions are provided with the surface side being a vertical surface, the same operation as in the case of FIG. 1 is achieved. That is, with respect to the vertical opening force F ₁ , the engagement between the main locking portion and the auxiliary locking portion provides exactly the same action as in the case of FIG.
The convex portion 5 and the concave portion 19 of the main locking portion formed on the inner peripheral surface side are engaged with each other to prevent the lid body 2 from coming off upward, and thus has a large opening leg opening force F ₂ . In addition, as described above, in the present invention, one side face corresponding to the fitting convex strip 4 and the fitting concave strip 8 is made substantially vertical so that the underside like the conventional double-sided mating shown in FIG. There is no problem that molding is difficult due to a large cut, and the fitting protrusion 4 is provided on the side wall 3 of the container body 1.
By providing it on the inner peripheral side of the upper end surface, the wall thickness of the side wall 3 can also be made thinner than in double-sided fitting.

The vertical opening force F ₁ , the opening leg opening force F ₂ , the thickness of the side wall, and the formability of the airtight container according to the present invention shown in FIGS. The structure shown in Table 1) and the conventional single-sided fitting (the structure shown in FIG. 11) are summarized in Table 1 below.

[0021]

[Table 1]

As is clear from Table 1, the airtight container according to the present invention has good moldability, and it is not necessary to increase the thickness of the side wall of the container. compared to Hirakifutaryoku F ₁ whereas the open leg lid opening force F ₂ is extremely lowered, the vertical lid opening force F ₁ and the open leg lid opening force F ₂ together without much difference, compared to the double-sided engaging lid opening A highly airtight container having a sufficient vertical opening force F ₁ and an opening leg opening force F ₂ which has less power but practically no problem can be obtained.

Next, one side surface corresponding to the main engaging portion of the fitting convex line and the fitting concave line is formed in a substantially S shape with its upper portion protruding outward, and also as an auxiliary locking portion. , The engaging projections and the engaging recesses are formed on the corresponding vertical side surfaces of the fitting projections and the fitting recesses, and the tops thereof are positioned lower than the tops of the projections of the main locking portion. It has been found that with the formed one, the fitting convex line and the fitting concave line are smoothly fitted when the lid is closed, and a strong fitting state is easily obtained. Although the detailed reason is not clear, the fitting operation is presumed to be as follows. That is, in the fitting operation in this case, as shown in FIG. 16, the tip of the fitting projection 4 first enters from the opening of the fitting projection 8 and is the main locking portion of the fitting projection 4. First, the convex portion 5 on the upper part of the S-shaped outer peripheral surface is fitted with the concave groove
The outer wall 13 of the mating groove 8 is slightly expanded to the outside of the container due to the elastic deformation peculiar to the foam synthetic resin, while being brought into contact with the convex portion 9 at the lower portion of the S-shaped outer peripheral surface as the main locking portion of the container. Similarly, the convex ridge 4 elastically deforms, and on the contrary, enters the concave ridge 8 while slightly bending inward (FIG. 17). When the fitting ridge 4 further enters into the fitting ridge 8 to deepen the fitting, the S of the fitting ridge 4 is increased.
The convex portion 5 on the upper portion of the S-shaped outer peripheral surface extends along the outer surface shape of the S-shaped outer peripheral surface of the fitting recessed line 8 and beyond the convex portion 9 of the S-shaped inner surface (FIG. 18). When the fitting is further deepened, the inner edge of the tip of the fitting projection 4 comes into contact with the locking projection 10 provided on the vertical inner peripheral surface of the fitting recess 8, and the fitting projection 4 is pushed out to the outside. The convex portion 5 on the upper portion of the character-shaped outer peripheral surface draws an S-shaped trajectory along the shape of the S-shaped outer peripheral surface of the fitting groove 8 and deeply enters the fitting groove 8 (Fig. 1).
9). When the fitting ridge 4 is pushed further into the fitting ridge 8 from this state, the inner edge of the tip of the fitting ridge 4 causes the elastic projection of the engaging projection 10 on the vertical inner peripheral surface of the fitting ridge 8. The locking recess 6 on the vertical inner peripheral surface of the fitting projection 4 as an auxiliary locking portion and the locking projection 10 on the vertical inner peripheral surface of the fitting recess 8 are engaged with each other and The strip 4 and the mating recessed strip 8 are completely fitted (Fig. 20).

In this fitted state, the convex portion 5 as the main locking portion on the upper portion of the S-shaped outer peripheral surface of the fitting convex strip 4 and the convex portion 9 of the lower portion of the S-shaped outer peripheral surface of the fitting concave strip 8 are formed. By engaging with each other, the engaging concave portion 6 on the vertical inner peripheral surface of the fitting convex strip 4 and the engaging convex portion 10 on the vertical inner peripheral surface of the fitting concave strip 8 are engaged by the auxiliary engaging portions. The fitting ridge 4 is prevented from coming off the fitting recess 8, and a good airtight state between the container body 1 and the lid 2 is maintained.

In the airtight container having the exhaust hole communicating from the bottom surface of the fitting groove to the outer surface of the lid, the air in the fitting groove is released to the outside through the exhaust hole when the lid is closed. Compressed air does not remain in the recess after the lid is closed, so that the lid closing operation is facilitated and the lid is prevented from rising.

Further, when a ventilation groove communicating with the inside of the container is formed on the joint surface of the fitting convex line and the fitting concave line, and an exhaust hole communicating with the outer surface is formed at an appropriate place of the container body or the lid. The air in the fitting groove at the time of closing the lid is discharged into the container from the ventilation groove, and the compressed air in the container is discharged to the outside from the exhaust hole provided in the container body or the lid. The lid can be easily closed and the lid is prevented from being lifted by compressed air in the container.

[0027]

The airtight container according to the present invention will now be described in more detail with reference to various embodiments shown in the accompanying drawings. Figure 3
What is shown in FIG. 6 is another example of the airtight container of the present invention, in which the engaging projection 10 as an auxiliary engaging portion is provided on the fitting projection 4 and the engaging recess 6 is fitted. The groove 8 is provided. 4 and 5, a plurality of locking concave portions 6 and locking convex portions 10 are provided.

As shown in FIGS. 6 and 7, the engaging projection 10 is provided on the vertical surface of either the fitting concave line 8 or the fitting convex line 4 as an auxiliary locking part, and the other vertical surface is provided. In the case of (1), a flat surface was formed without providing a locking recess at the time of molding. In this case, when the lid body 2 is fitted to the container body 1,
Auxiliary locking that engages with each other by the locking projection 10 provided on one of the vertical surfaces of the fitting convex strip 4 and the fitting concave strip 8 pressing the other vertical surface to deform that portion. The part is formed.

Further, in the structure shown in FIG. 8, instead of providing the above-mentioned locking convex portion 10 as an auxiliary locking portion, the vertical surface (FIG. 8 (a)) or the fitting convex strip 4 is fitted. The vertical surface of the concave streak 8 (FIG. 8 (b)) is roughened, and by making the vertical surface a rough surface 10 ′, the vertical surface of the fitting convex streak 4 is formed by the rough surface 10 ′. By increasing the frictional resistance between and the vertical surface of the fitting groove 8, it acts as an auxiliary locking portion.

FIG. 13 is a perspective view of the airtight container according to the present invention in an open-lid state showing a specific embodiment, and FIG. 14 is a vertical cross-sectional view of the closed-lid state. In the figure, reference numeral 1 is a container body, and reference numeral 2 is a lid. The container body 1 and the lid body 2 are made of expanded polystyrene resin such as expanded polystyrene.
Alternatively, it is molded with a foamed polyolefin resin such as foamed polyethylene or foamed polypropylene.

The container body 1 is in the form of a box having an upward opening, and an upward fitting ridge 4 is provided on the inner peripheral side of the upper end surface of the side wall 3 over the entire length in the circumferential direction. As shown in FIG. 15, the outer peripheral surface of the fitting convex strip 4 is formed into a substantially S-shape with its upper portion protruding outward to form a main locking portion, and the inner peripheral surface of the fitting convex strip 4 is also formed. Is formed as a substantially vertical surface continuously from the inner surface of the side wall 3 of the container body 1, and an auxiliary locking portion is formed on the vertical inner peripheral surface at a position slightly lower than the top of the convex portion 5 on the upper portion of the S-shaped outer peripheral surface. The engaging recessed portion 6 is formed. On the other hand, a side wall 7 is provided around the entire lower surface of the lid body 2, and a lower end surface of the side wall 7 that joins the upper end surface of the side wall 3 of the container body 1 when the lid is closed corresponds to the fitting projection 4. The recessed groove 8 is provided around. The outer peripheral surface of the fitting groove 8 has a lower portion formed into a substantially S-shape protruding into the fitting groove 8 to form a main locking portion,
In addition, the inner peripheral surface of the fitting concave line 8 is formed to be a substantially vertical surface, and the auxiliary locking portion is formed on the vertical inner peripheral surface at a position slightly higher than the convex portion 9 protruding from the lower portion of the S-shaped outer peripheral surface. Is formed, and the opening edge on the inner peripheral side below the engaging projection 10 is an inclined surface 11 inclined toward the inside of the container. Further, a plurality of exhaust holes 12 penetrating the upper surface of the lid 2 are formed at a predetermined interval along the circumferential direction of the fitting groove 8 from the bottom surface of the fitting groove 8 of the lid 2. Become.

The airtight container according to the present invention as described above accommodates fruits and vegetables, seafood, etc. inside the container body 1 and pre-cools it in, for example, a vacuum chamber, a differential pressure chamber, a refrigerator or a refrigerating chamber, Alternatively, stored items such as fruits and vegetables are stored inside the container body 1 together with ice, a cold storage material, etc., and the lid 2
Then, it is closed in an airtight state and stored in a refrigerated state, or provided for distribution.

In this airtight container, the fitting convex strip 4 and the fitting concave strip 8 which are fitted in a concavo-convex shape are formed in a substantially S-shape on one side which abuts each other to form a main locking portion. ,
By making the other side surface approximately vertical, the mating operation is much smoother than in the case of double-sided mating in which protruding parts are provided symmetrically on both sides of the mating ridge and the mating ridge. Be seen. Further, the projections 5 and 9 are provided only on one side surface of the fitting convex strip 4 or the fitting concave strip 8, and the locking concave portion 6 and the locking convex portion 10 as auxiliary locking portions are provided on the other vertical surface. Since the irregularities on the left and right side surfaces are provided asymmetrically, the undercut is shallow and the die can be easily removed during molding. Moreover, the fitting recess 8 facing the S-shaped side surface
When the opening edge of is the inclined surface 11, the S-shaped entry of the fitting projection 4 into the fitting recess 8 becomes smoother.

In the closed state in which the fitting convex strip 4 and the fitting concave strip 8 are fitted together in this way, the convex portion 5 and the convex portion 9 on the S-shaped outer peripheral surface as the main locking portion are mutually engaged. Due to the locking relationship and the engaging relationship between the locking concave portion 6 and the locking convex portion 10 on the vertical inner peripheral surface as the auxiliary locking portion, the fitting convex strip 4 is vertically separated from the fitting concave strip 8. This is prevented, and the airtight state between the container body 1 and the lid body 2 is maintained. As described above, since the main locking portion and the auxiliary locking portion have a large resistance force against the lid opening force in the vertical direction, it is possible to prevent the contents stored in the container body 1 from jumping up due to vibration during transportation. Even when an upward force is applied to the lower surface of the lid body 2, the lid body 2 does not float up,
Further, since the auxiliary locking portion is provided on the inner peripheral side, the opening leg opening force F ₂ becomes larger than that of the conventional single-sided fitting, and the airtight state is maintained well.

Further, when the outer groove 13 of the fitting groove 8 of the lid 2 is provided with a groove 14 along the circumferential direction, the fitting projection 4 enters the fitting groove 8. Outer wall of the mating groove 8 when
This is preferable because the 13 parts can be easily expanded to the outside and the fitting operation can be performed smoothly.

A side wall 7 is provided around the lower surface of the lid 2,
When the fitting groove 8 is provided around the lower end surface of the side wall 7, when the inner wall 15 of the fitting groove 8 expands inward of the container when the fitting projection 4 is fitted, the outer wall of the fitting groove 8 extends. It becomes difficult for the 13 part to spread outward, and it tends to be difficult for the fitting projection 4 to enter the fitting recess 8. Therefore, by forming ribs 16 at appropriate positions in the circumferential direction of the inner wall 15 from the inner wall 15 toward the lower surface of the lid body 2, when the fitting projections 4 enter the fitting recesses 8, the fitting recesses 8 are formed. Inner wall of Article 8
Prevents the 15 parts from spreading to the inside, and the mating recessed line 8
The outer wall portion expands to the outside, facilitating the entry of the fitting convex strip 4 into the fitting concave strip 8, and prevents the inner wall portion of the fitting concave strip 8 from spreading inside when the lid is closed. This is a preferable form for preventing the fitting convex strip 4 in the fitted state from falling off the fitting concave strip 8.

Further, by forming the vertical inner peripheral surface of the fitting projection 4 of the container body 1 continuously from the inner surface of the side wall 3, the container body 1
The inner surface of the container has a simple shape, the molding is facilitated, the strength is increased, and the wall thickness of the container body side wall 3 can be made thinner.

Further, in the airtight container as described above, if an exhaust hole 12 is formed so as to penetrate from the bottom surface of the fitting groove 8 to the upper surface of the lid body 2 as shown in the drawing, when the lid is closed, the fitting hole 12 is fitted. Since the air in the fitting recessed line 8 is released to the outside through the exhaust hole 12, the lid closing work becomes easy and the automatic lid closing by the machine becomes possible. It is possible to prevent the lid 2 from floating up without remaining.

Further, as shown in FIG. 21, a ventilation groove 17 communicating with the inside of the container is formed on the joint surface between the fitting convex line 4 of the container body 1 and the fitting concave line 8 of the lid 2. In this case, the air compressed inside the container when the lid is closed is fitted into the fitting groove 8 from the ventilation groove 17.
Since it is released to the outside through the exhaust hole 12 communicating with the fitting recessed line 8, the internal pressure of the container does not rise when the lid is closed, and the lid 2 floats up due to the internal pressure rise and the container is deformed. Since such a problem does not occur, it becomes easy to mechanize the lid, which was conventionally difficult.

Further, as shown in FIG. 22, an opening is formed on the bottom surface of the fitting groove 8 at the joint surface between the tip surface of the fitting projection 4 of the container body 1 and the bottom surface of the fitting groove 8 of the lid 2. In the case where the air reservoir 18 communicating with the exhaust hole 12 is provided, the air in the groove 8 which is compressed when the lid is closed is once introduced into the air reservoir 18, and from there, through the exhaust hole 12 to the outside. Is released to. In this way, when the lid is closed, the air in the fitting groove 8 is once guided to the air reservoir 18, whereby uneven distribution of the compressed air in the fitting groove 8 is prevented, and the compressed air is reliably discharged to the outside. To be done.
In this case, the air reservoir 18 is continuously provided in the circumferential direction along the fitting recess 8 and the air reservoir 18 is provided.
By disposing the exhaust hole 12 and the ventilation groove 17 which are provided in communication with each other so as to be spaced apart from each other, the compressed air in the fitting groove 8 and the container is favorably outside the container when the lid is closed. Since it is discharged into the container, it is possible to smoothly close the lid, and the automatic lid closing by the machine, which has been desired for many years, can be performed more smoothly. Moreover, once the lid is closed, even if the inside and the outside of the container are in communication with each other by the ventilation groove 17, the air reservoir 18, and the exhaust hole 12, the inside and outside of the container are affected by the ventilation resistance in these ventilation paths. Since the free ventilation of is substantially blocked, the airtightness of the container becomes a problem, and the heat insulating effect is not substantially impeded.

Further, in the case of adopting this structure, it is possible to perform vacuum pre-cooling in the vacuum chamber with the lid kept closed. That is, the air in the container is ventilated groove 17, air reservoir 18, exhaust hole 12
It is exhausted well and the contents are pre-cooled. When pre-cooling is completed, air enters in the opposite direction and returns to normal pressure. After returning to normal pressure once, free ventilation inside and outside the container is substantially obstructed by the ventilation resistance in these ventilation passages, so that a substantially airtight state can be maintained and good cold insulation can be secured.

The exhaust hole 12 penetrating from the bottom surface of the fitting groove 8 of the lid body 2 to the outer surface thereof usually has a diameter of 1 to 5.
mm, preferably 2-4 mm, more preferably 2-3 m
It is about m. The exhaust hole 12 may be a mere straight hole, but if a thin shielding film is formed in the exhaust hole 12, the shielding film is formed by the pressure of the air compressed in the fitting groove 8 when the lid is closed. Is broken and the air in the fitting groove 8 is released to the outside, but thereafter, the shielding film returns to its original state due to the elasticity peculiar to the foam synthetic resin, or even if it does not return, the hole diameter of the exhaust hole 12 External air to the exhaust hole
Entry through 12 is either blocked or the airflow resistance is increased, so that the container remains better sealed. The thickness of this shielding film may be appropriately set depending on the material of the foamed synthetic resin of the lid body 2, the size of the exhaust hole 12, etc.
In the case of expanded polystyrene, the thickness of the shielding film is 0.5
It may be about mm, and if it is up to about 1 mm, it may be broken by compressed air to release the air. In addition, this shielding film,
It may be provided at any position of the exhaust hole 12.

In each of the above-mentioned embodiments, the exhaust hole 12 is provided from the bottom surface of the fitting groove 8 in the lid body 2 to the outer surface, but the exhaust hole shown in FIG. 12
Instead of, the ventilation groove 17 communicating with the inside of the container is formed on the joint surface of the fitting convex strip 4 and the fitting concave strip 8, and the exhaust hole 20 communicating with the outer surface is formed at an appropriate position of the lid 2. It is a thing. In this case, since the air compressed in the container at the time of closing the lid is discharged to the outside of the container through the exhaust hole 20, the internal pressure of the container does not rise, and the air in the fitting groove 8 is also vented. By being discharged into the container from the groove 17 and the compressed air in the container being discharged to the outside from the exhaust hole 20 provided in the lid body 2,
It is also prevented that compressed air remains in the fitting groove 8.
The exhaust hole 20 may be provided in the container body 1 or may be provided in both the container body 1 and the lid 2. Further, in this case, an air collecting portion 18 is provided along the circumferential direction on the joint surface between the fitting convex strip 4 and the fitting concave strip 8 and the ventilation groove 17 is provided so as to communicate with the air collecting portion 18. You may do it.

As described above, even when the exhaust holes 20 are provided in the container body 1 or the lid body 2, the number and position of the exhaust holes 20 can be set appropriately, and the container body 1 and the lid body 2 can be appropriately set. You may make it provide this exhaust hole 20 in both.

The airtight container according to the present invention is as described above, but the airtight container is not limited to the above-mentioned embodiment, and for example, the fitting ridge 4 and the lid of the container body 1 can be used. The fitting concave line 8 on the lower surface of the body 2 does not necessarily have to be provided over the entire circumference of the container, but may be provided on a part of the circumference, or may be provided on the inner surface of the fitting convex line 4 as an auxiliary locking portion. Locking concave portion 6 and locking convex portion on the inner surface of the fitting concave streak 8 that fits with this
10 does not need to be provided over the entire length of the fitting convex strip 4 or the fitting concave strip 8 and may be provided in a part thereof. or,
The fitting recessed line 8 may be directly provided on the lower surface of the lid body 2 without providing the side wall 7 on the lid body 2. Further, as the exhaust hole 12 provided so as to communicate from the bottom surface of the fitting groove 8 to the outer surface, it is sufficient that the exhaust hole 12 communicates from the inside of the fitting groove 8 to the outside.
In addition to penetrating from the bottom surface of the fitting concave line 8 to the upper surface of the lid body 2 as in the embodiment, it may be penetrating to the outer side surface of the lid body 2 and the number and positions of the exhaust holes 12 are also different. It may be appropriately provided depending on the length and size of the recessed line 8. Also, the fitting ridge 4
The ventilation groove 17 and the air collecting portion 18 provided on the joint surface between the fitting concave line 8 and the fitting concave line 8 may be provided in either the fitting convex line 4 or the fitting concave line 8 and further provided over both of them. May be.

[0046]

As described above, in the airtight container according to the present invention, the fitting ridge of the container body and the fitting ridge of the lid, which are fitted to each other while maintaining the airtight state of the container, are joined together. While forming the main locking part on the side surface, forming the other side surface to a substantially vertical surface,
Moreover, since an auxiliary locking portion is provided on this vertical joint surface,
It has better moldability than the double-sided fitting, and the thickness of the side wall of the container body can be made thinner. Moreover, compared with the conventional single-sided fitting, the vertical opening force and the leg opening force can be increased. It is possible to obtain an airtight container having excellent airtightness.
That is, as described above, the fitting convex strip has a convex portion formed on only one side surface to serve as a main locking portion, and the other side surface is a vertical surface. Width is narrow,
Moreover, by providing this fitting protrusion on the upper end surface of the side wall on the container body side, the wall thickness of the side wall is smaller than that in the case where the fitting protrusion is provided on the lid side and the fitting recess is provided on the side wall of the container body. In addition to being economical, it is also possible to provide convex portions on both sides of the mating ridges by making the shapes of the mating ridges and mating ridges asymmetrical so that the tip end side is the base end side. Compared to the conventional double-sided fitting that is symmetrically wide, the undercut portion is shallower, and it is easier to remove the mold during molding. Also, in the closed state where the lid body is fitted to the container body, the engagement relationship by the main locking portion formed on one side surface of the fitting convex strip and the fitting concave strip and the other vertical joint surface The fitting ridges and the fitting ridges are firmly fitted and connected to each other by the engaging relationship of the auxiliary locking portion formed on the container, and the airtight state in the container is maintained well, and the contents stored in the container are It is possible to prevent the lid body from being lifted up due to the bouncing of the lid.

[0047] Moreover, locking of the Omogakari stop portion of the Hamagototsujo mating concave and forming the S-shaped strip, as the auxiliary engagement portion in down position from the top of the S-shaped protrusions Formed part
Therefore , when the two are fitted together, the S-shaped side surface of the fitting convex strip is S along the surface shape of the S-shaped side surface of the corresponding fitting concave strip.
It fits in a smooth motion by drawing a letter-shaped trajectory. In this S-shaped fitting, if the opening edge on the vertical inner surface side of the fitting groove is formed as an inclined surface, the opening edge on the opposite side does not get in the way when the fitting convex piece enters the fitting groove, The S-shaped entry of the fitting protrusion into the fitting recess becomes easier, and the lid closing operation is performed smoothly.

Further, an exhaust hole penetrating from the bottom surface of the fitting groove to the outer surface of the lid is provided, or a ventilation groove communicating with the inside of the container is provided on the joint surface between the fitting convex piece and the fitting concave piece. If an exhaust hole communicating with the outside is provided at an appropriate place on the lid or the container body, the air in the fitting groove when closing the lid and the air compressed in the container will be discharged from the exhaust hole to the outside of the container. It is possible to prevent the lid body from being released and floating up when the lid is closed, and it is possible to reliably maintain the airtight state of the container, and at the same time, it is possible to mechanize the lid work.

[Brief description of drawings]

FIG. 1A and FIG. 1B are longitudinal sectional views showing an example of a fitting structure between a container body and a lid in an airtight container according to the present invention.

2 (a) and 2 (b) are longitudinal sectional views showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

FIG. 3 is a vertical cross-sectional view showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

FIG. 4 is a vertical cross-sectional view showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

FIG. 5 is a vertical cross-sectional view showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

FIG. 6 is a vertical cross-sectional view showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

FIG. 7 is a vertical cross-sectional view showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

8 (a) and 8 (b) are longitudinal sectional views showing another example of the fitting structure of the container body and the lid in the airtight container according to the present invention.

9 (a) and 9 (b) are longitudinal sectional views showing a vertical fitting structure of a container body and a lid in a conventional airtight container.

10 (a) and 10 (b) are vertical sectional views showing a double-sided fitting structure of a container body and a lid in a conventional airtight container.

11 (a) and 11 (b) are longitudinal sectional views showing a single-sided fitting structure of a container body and a lid in a conventional airtight container.

12 (a) and 12 (b) are longitudinal sectional views showing another example of a single-sided fitting structure of a container body and a lid in a conventional airtight container.

FIG. 13 is a perspective view of an embodiment of an airtight container made of a foamed synthetic resin according to the present invention.

FIG. 14 is a vertical sectional view of the airtight container.

FIG. 15 is a cross-sectional view of a main part showing a fitting convex line and a fitting concave line before fitting.

FIG. 16 is a cross-sectional view of a main part showing a state in which a fitting convex line and a fitting concave line are fitted to each other.

FIG. 17 is a cross-sectional view of a main part showing a state in which a fitting convex line and a fitting concave line are fitted to each other.

FIG. 18 is a cross-sectional view of a main part showing a state in which a fitting convex line and a fitting concave line are fitted to each other.

FIG. 19 is a cross-sectional view of an essential part showing a state in which a fitting convex line and a fitting concave line are fitted to each other.

FIG. 20 is a cross-sectional view of a main part in a state where a fitting convex strip and a fitting concave strip are fitted together.

FIG. 21 is a cross-sectional view of a main part showing another embodiment of a fitting convex strip and a fitting concave strip.

FIG. 22 is a cross-sectional view of a main part showing still another embodiment of a fitting convex strip and a fitting concave strip.

FIG. 23 is a vertical cross-sectional view of a main part showing another example of the airtight container.

[Explanation of symbols]

1: Container body, 2: Lid body, 3: Side wall, 4: Fitting convex strip, 5: Convex part, 6: Locking concave part, 7: Side wall, 8: Fitting concave streak, 9: Convex part, 10: Locking protrusion, 11: inclined surface,
12: exhaust hole, 13: outer wall, 14: groove, 15: inner wall, 1
6: Rib, 17: Ventilation groove, 18: Air trap, 19:
Recess, 20: exhaust hole.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-2-85164 (JP, A) Actually open Sho 60-92959 (JP, U) Actually open Sho 60-90149 (JP, U) Actually open Sho 59- 43349 (JP, U) Actual opening Sho 60-62448 (JP, U) Actual opening Flat 2-8785 (JP, U) Actual opening Flat 3-45845 (JP, U) Actual opening Sho 62-80875 (JP, U) Actual Kaihei 1-107561 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 81/38 B65D 81/24 B65D 43/00

Claims (4)

(57) [Claims] 1. A container main body made of a foamed synthetic resin and a lid, and an upward fitting ridge is provided around the entire circumference or a part thereof in the circumferential direction on the inner peripheral side of the upper end surface of the side wall of the container main body. Then, a fitting concave line corresponding to the fitting convex line is provided around the lower surface of the lid body that is joined to the upper end surface of the side wall of the container body when the lid is closed, and the fitting convex line and the fitting concave line are formed. The top of one corresponding side protrudes outward
Is formed into a substantially S-shape to form a main locking portion , the other side surface is formed into a substantially vertical surface, and the vertical convex surface serves as an auxiliary locking portion and is provided with a fitting ridge.
A locking protrusion is formed on one of the vertical side surface and the vertical side surface of the mating groove.
And a locking recess that engages with the locking projection on the other side
Part or leave the other flat during molding,
In addition, the top of the locking protrusion of the auxiliary locking portion is attached to the main locking portion.
An airtight container formed at a position lower than the top of the convex portion . 2. A claim made by forming the height of the engaging protrusion of the auxiliary engagement portion to about one third of the height of the convex portion of the Omogakari stop portion
The airtight container according to 1 . 3. The airtight container according to claim 1, further comprising an exhaust hole communicating from the bottom surface of the fitting groove to the outer surface of the lid. 4. An air vent groove communicating with the inside of the container is formed on a joint surface between the fitting convex line and the fitting concave line, and an exhaust hole communicating with the outer surface of the container is formed at an appropriate place of the lid body or the container body. The airtight container according to any one of claims 1 to 3 , wherein