JPS5849983Y2 - thermal container - Google Patents

Description

[Detailed description of the invention] This invention relates to a highly heat-retaining container whose body and lid are molded from foamed synthetic resin.In particular, the lid is attached to the body with a snap to improve airtightness, and at the same time, the lid is The through-hole was improved to make it easier to remove the lid.

To explain the present invention with reference to the drawings, 1 is a body, and 2 is a lid, both of which are molded from a foamed synthetic resin, such as expanded styrene, with a foaming ratio of about 20 to 30 and a wall thickness of about 5 to 7 mm. The body 1 has a flange 3 extending outward all or partially along the upper edge of the circumferential wall, and the lid 2 has the flange 3 along the inner circumferential edge. It has a groove 4 into which the portion 1' is fitted.

The lid 2 has inwardly protruding integral claws 6 that lock the lower surface of the body tsuba 3 at appropriate intervals along the lower edge of the outer peripheral wall 5 forming the groove 4, and has a through hole 7 of the same size as the claw 6 directly above the claw 6.

When used as a lunch box or the like, the lower surface of the top cover 2' surrounded by the inner circumferential wall 8 forming the groove 4 has a large number of grooves with a depth of about 1 to 4 mm and a width of about 1 to 3 mm, or as shown in the figure. The condensed water retaining means 9 is provided with a number of blind holes with the bottoms facing upward and having the same depth and diameter of about 1 to 3 mm.

The above-mentioned dimensions of the grooves and blind holes serving as the condensed water retaining means are for retaining the condensed water inside by surface tension.

FIG. 4.5 shows a mold for forming the lid with the claws 6 mentioned above.

Reference numeral 11 designates an upper mold that forms the upper surface and outer surface of the lid, and 12 represents a lower mold that forms the lower surface and inner surface of the lid. When both molds 11 and 12 are closed, a lid molding cavity 13 is created between them.

A protrusion 14, which is slightly smaller than the contour of the lid, protrudes from the upper surface of the lower mold 12 along the contour of the lid in order to form the groove 4.
The outer surface of the protruding portion 14 is provided with recesses 16 for forming claws at predetermined intervals in which the claws 6 are to be formed.

In this embodiment, when the lid is put on the body and pushed in, the claw 6 bends the outer peripheral wall 5, climbs over the outer edge of the flange 3, and has an obliquely downward slope 6' that passes through the tsuba 3 downward. The lower half of the slope is 16'.

The upper mold 11 is provided with downward protruding pieces 15 having the same cross-sectional shape as the upper half of the recesses 16 at positions corresponding to the recesses 16, respectively.

The downward length of this protruding piece 15 is determined such that when both molds 11 and 12 are closed, the protruding piece 15 enters the recess 16 from above and its lower end is positioned on the lower half slope 16'.

Therefore, both molds 11 and 12 are closed, and a synthetic resin material containing a foaming agent is filled into the cavity 13 using a conventional foam molding method, heated and foamed, a lid is molded, and the mold is released by cooling. .

At this time, the protruding piece 15 is separated directly upward together with the upper mold, so that the molded claw 6 is easily released from the lower mold.

Therefore, the molded lid has a through hole 7 having the same projected area shape as the claw 6 where the protruding piece 15 was located right above the winter melon 6.

Note that the lower mold 12 may be provided with a protrusion or protrusion 17 that forms the condensed water retaining means 8 on the inner upper surface surrounded by the protrusion 14 .

In this way, the heat insulating container of the present invention does not require the use of complicated split molds, and both the body and lid can be molded from foamed synthetic resin using a pair of upper and lower molds, and the body and lid can be molded especially inside the groove 4 where they fit. Because it is sealed, it has excellent insulation properties, so for example, hot rice placed in it will not lose much of its temperature over a long period of time, and if you put freshly cooked rice in it, it will remain almost freshly cooked.

Then, when you put the lid on your body and attach it, the claw 6 of the lid will be attached to the body guard 3.
The lid snaps onto the lid, so it won't come off during transportation.

For this reason, there is no need to attach the body and lid with adhesive tape or use rubber bands or other auxiliary materials to prevent them from coming off.

Moreover, since the claws 6 need only be provided at appropriate intervals, for example at four corners, rather than all around the lower layer of the lid, it is easy to remove the lid from the body.

In addition, the through hole 7 cooperates with the protruding piece 15 to facilitate the release of the lid formed as described above and prevents the claw 6 from being damaged during mold release. After putting something in the container and putting the lid on, the temperature inside the container drops and the air inside contracts, creating a negative pressure inside the container, which acts as an air intake hole and makes it easier to remove the lid. It has the effect of

That is, in this case, if there is no through hole 7, the negative pressure inside the container will cause the outer wall 5 to seal even the outer circumferential side of the jaw 3, so the inside of the container will be kept in a vacuum until just before the lid is removed, making it extremely difficult to remove. .

However, in this case, there is a through hole 7, so if you put your finger on the lid at the through hole and push it up, the inner seal will loosen, and the through hole 7
The lid can be easily removed because air enters the inside and communicates with the outside air.

Furthermore, when the internal pressure of the container increases to the extent that it deforms the lid, the through hole 7 acts as a safety valve.

In other words, when you put something hot inside a container and put the lid on, the air inside expands and the internal pressure increases, trying to push the lid up, but since the lid is firmly snapped onto your body by the claws 6, the internal pressure normally increases. cannot be leaked outside.

However, when the internal pressure increases enough to deform the lid, the lid snaps upward and deforms upward, and when the seal inside the fitting groove 4 loosens, the through hole 7 releases an excessive amount of internal pressure and Maintain a constant internal pressure.

Therefore, the claw 6 is prevented from coming off and the internal pressure becomes O, and the claw 6 is reliably maintained in a snap-engaged state by the moderate internal pressure remaining in the container, thereby preventing the lid from coming off from the body.

Furthermore, in this embodiment, the steam generated when hot rice is placed in the container adheres to the bottom surface of the lid and condenses, but this condensed water is held by the condensed water holding means due to surface tension, so it does not drip.
Therefore, the rice in the container will not get wet with dripping condensed water and the taste will not deteriorate.

However, this condensed water retaining means may be provided not only on the lower surface of the lid but also on, for example, the bottom surface of the body.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an embodiment of the heat-insulating container of the present invention, Fig. 2 is an internal view of a portion of the same lid, Fig. 3 is an external view of a portion of the same, and Fig. 4 is a molded lid. FIG. 5 is an enlarged cross-sectional view of the main parts of the mold in the closed state, and is a perspective view of a part of the lower mold as above, and in the figure,
1 is body, 2 is lid, 2' is its upper wall, 3 is tsuba, 4 is groove, 5
indicates the outer circumferential wall of the lid, 6 indicates a claw, and 7 indicates a through hole.

Claims (1)

[Scope of utility model registration request] Consisting of a body and a lid made of foamed synthetic resin, the body has a flange that protrudes outward all or part of the upper edge of the peripheral side wall, and the lid has a groove into which the upper edge of the peripheral side wall of the body fits. The lower edge of the outer peripheral wall that forms this groove is provided with inward claws that lock the lower surface of the body guard at appropriate intervals along the lower edge, and the earthen wall is provided with claws that point directly above the claws. A heat insulating container characterized by having a through hole the same size as a nail.