JPS583548Y2 - portable lunch box - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a portable lunch box.

Portable bento boxes have a structure in which the outer periphery of the storage container that houses the inner containers such as vegetable containers, rice bowls, and water bottles is coated with insulation means such as a vacuum double layer or heat insulating material to obtain a heat-retaining effect. However, since the opening of the storage container requires a robust structure due to its connection with the top lid, it is difficult to construct an appropriate heat insulating structure, and as a result, the heat insulation effect is diminished near the opening due to heat conduction. It has the disadvantage that it cannot necessarily provide sufficient heat retention function.

In particular, when replacing the insulation with a vacuum double layer and adopting an insulating material, it is thought that the heat dissipation from the middle body will be greater than when using a vacuum double layer. Sufficiently prevents heat dissipation due to heat conduction from the
It is necessary to compensate as much as possible for the reduction in heat retention effect caused by the insulation material.

This idea was created in view of the above-mentioned technical problem, and the purpose is to provide a portable lunch box that improves the heat retention effect by minimizing heat dissipation due to heat transfer from the opening of the container. That is.

To explain an example, rice bowl 9. The storage container 1 that houses water bottles 8, etc. is made of a synthetic resin material, and the upper part near the opening has a vegetable container 10 placed at the top of the storage container 1, which has a relatively low need for heat insulation. A shoulder portion 1a for receiving the inner container is formed, and a lip member 5 for receiving the upper lid 4 is fitted onto the outer periphery of the opening edge portion 1b.

The wall thickness of the shoulder portion 1a of the container 1 is the thickness of the body portion 1 of the container 1.
A water bottle 8 which is formed thinner than C and is housed in the bottom or a portion corresponding to the body of the storage container 1. The heat absorbed from the inner container that requires relatively high heat retention, such as the rice bowl 9, is absorbed by the body 1C of the storage container 1.
This is to prevent heat from being transferred through the shoulder portion 1a to the opening edge portion 1b, which has a smaller heat insulating effect.

As shown in FIG.
The heat transfer path from the shoulder 1a to the opening edge 1b may be made as long as possible by forming the shoulder 1a in a wave shape as shown in FIG. .

However, as a structure to lengthen the heat transfer path of the shoulder portion 1a, the distance between the upper end of the body portion 1C and the opening edge 1b may be increased as shown in FIG. The shoulder portion 1a itself may be formed flat by simply making it longer.

The outer periphery or bottom of the container 1 is covered with a foamed heat insulating material 2, and the outer surface of the foamed heat insulating material 2 is covered with an exterior body 3.

Reference numeral 6 denotes a stopper that engages with a flange portion 4a formed on the outer periphery of the opening edge of the upper lid 4 and holds the upper lid 4 in a closed state, and a pedestal 7 that covers the outer periphery of the opening edge 1b of the container 1 and the upper part of the exterior body 3.
Fixed to.

The above embodiment is for a rectangular cylindrical bento box as shown in the plan view in Fig. 2, but a bento box with a structure in which the storage container is housed in a vacuum double bottle as a heat insulating means is also applicable. Of course, the same applies to other cases as well.

This invention consists of the above-mentioned structure, and the rice bowl 9. Body part 1 of storage container 1 where inner containers that require high heat retention, such as water bottles 8, are stored.
The heat absorbed by the container 1 at C or the bottom is:
Due to the thin shape of the shoulder portion 1a relative to the body portion 1C, the opening edge 1
Heat is not easily transferred to the b side, and heat dissipation from the opening edge 1b, which is not provided with heat insulation means, is suppressed.

In particular, in the case of the embodiment in which the shoulder portion 1a is formed into a wave shape as shown in FIG. Dispersion is suppressed and the heat retention effect is further improved.

According to this idea, the bottom or body of the storage container corresponds to the storage position for inner containers that need to be kept warm, such as rice bowls and water bottles, and the inner containers that need less heat retention, such as vegetable containers, are placed. Since the shoulder section, which is thinner than the body, is connected to the opening edge, which is formed so as to spread out, the heat absorbed by the body or the bottom is prevented from being transferred to the opening edge, which is not heat-insulated. Conduction is suppressed and the heat retention effect can be improved.

In particular, when the shoulder is formed into a wave shape as shown in Figure 4, the contact area of the shoulder with the bottom of the vegetable holder becomes smaller, so there is less heat dissipation through the vegetable holder, and heat retention is achieved. It is possible to further improve the effectiveness.

[Brief explanation of drawings]

FIG. 1 is a front view of the embodiment showing a half part in longitudinal section, FIG. 2 is a plan view of the embodiment shown in FIG. 1, and FIGS. 3, 4, and 5.
Each figure is an enlarged longitudinal cross-sectional view showing a main part of another embodiment. 1...Storage container, 1a...Shoulder, 1b.
...Opening edge, 1C...Body, 2...
...Foam insulation material, 3... Exterior body, 4...
...Top lid, 4a...Flange part, 5...
- Mouth rim member, 6... Clasp, 7... Pedestal, 8... Water bottle, 9... Rice bowl, 10.
...Vegetable container.

Claims (2)

[Scope of utility model registration request] (1) The body of the storage container corresponds to the storage position for inner containers that require high heat retention, such as rice bowls and water bottles, and is expanded to accommodate inner containers that require less heat retention, such as vegetable containers. A portable lunch box characterized by having a shoulder section that is thinner than the body section and connected to the edge of the open opening. (2) The portable lunch box according to claim 1, which is characterized in that the shoulder portion is formed in a wave shape.