JP3242268U - Bento box for microwave heating - Google Patents

Abstract

A microwave-heated lunch box is provided for serving food in a state in which the stored foodstuffs are heated by microwave heating.
The bento box is formed by covering an opening of the container body with a lid while an inner container 2 containing foodstuffs is fitted inside the container body 1, and is configured to be heated in a microwave oven. , the container body and the inner container form a water reservoir chamber 19 between the bottom walls 5 and 8 of both containers, and form a steam chamber 20 between the peripheral walls 6 and 9 of both containers. By heating the container main body covered with the lid 3 with the microwave oven in a state where water is retained in the water storage chamber, the high-temperature steam rising from the steam chamber is sent to the inside of the inner container. It is configured to enter and pressurize the food material.
[Selection drawing] Fig. 3

Description

TECHNICAL FIELD The present invention relates to a lunch box to be carried while containing cooked foodstuffs, and relates to a lunch box for heating in a microwave oven for serving meals in a state of being warmed by microwave heating.

BACKGROUND ART Conventionally, a lunch box has been provided to be carried in a state in which cooked rice and side dishes are contained as cooked foodstuffs, and to be eaten at a predetermined place.

By the way, since the food ingredients of the bento are cold, they cannot be eaten deliciously. Therefore, for example, when a lunch box brought from home is eaten at a place where a microwave oven can be used, such as a school or company, the lunch is heated by microwave heating.

For this reason, lunch boxes made of materials suitable for heating in microwave ovens have been conventionally provided.

JP 2005-198677 A Utility Model Registration No. 3170849

By the way, conventional microwave-heatable lunch boxes are merely molded from heat-resistant plastics such as polypropylene in order to be compatible with microwave ovens. In particular, there is an unresolved problem as to what configuration should be used to heat cooked food in a microwave oven while it is still in the lunch box.

An object of the present invention is to solve the above problems and to provide a lunch box for heating in a microwave oven, in which cooked food can be deliciously warmed by microwave heating while the food is still in the lunch box.

Therefore, the present invention consists of a container body having an upper opening having a bottom wall and a peripheral wall, and a container body having an upper opening having a bottom wall and a peripheral wall which is detachably fitted into the container body. and a lid covering the opening of the container body in which the inner container is fitted in a sealed state. is a lunch box for serving food in a state in which food is heated by microwave heating by irradiating microwaves on the inside, and the container body and the inner container form a water storage chamber between the bottom walls of both containers, A steam chamber is formed between the peripheral walls of the container, and the steam chamber communicates with the opening of the inner container. By microwave heating, high-temperature steam rising in the steam chamber is made to enter the interior of the inner container to pressurize the food, and the steam chamber is formed between both peripheral walls of the container body and the inner container. By providing eave-shaped fins projecting from one side to the other side, a pressure increasing chamber is formed below the fins and an exhaust passage is formed on both sides of the pressure increasing chamber with respect to the circumferential direction of the peripheral wall. be.

In a preferred embodiment of the present invention, the inner container is integrally formed with an extended peripheral wall projecting upward from an upper opening edge of the container body in a state of being fitted inside the container body, and the lid body is a lid wall covering the upper opening of the inner container and a downward peripheral wall surrounding the periphery of the extended peripheral wall of the inner container from the periphery of the lid wall are integrally formed, and the lower end of the downward peripheral wall defines the opening of the container body. Between the extended peripheral wall and the downward peripheral wall, a communication passage is formed to communicate the steam chamber with the opening of the inner vessel, and the width dimension W1 of the steam chamber in cross-sectional shape is formed. and the width W2 of the communication path is formed to satisfy W1>W2.

At this time, a narrow passage is formed between the steam chamber and the communicating portion, and the width dimension W3 of the narrow passage in cross-sectional shape is equal to the width dimension W1 of the steam chamber and the width dimension W2 of the communicating passage. , W1>W3>W2.

Preferably, the fins projecting from one of both peripheral walls of the container body and the inner container toward the other form an orifice by a gap between the tip of the fin and the other peripheral wall, and the orifice in cross-sectional shape is The width W4 of the communication path is W2>W4 with respect to the width W2 of the communication path.

According to the present invention, it is possible to store cooked foodstuffs and serve them to meals in a state in which the preserved foodstuffs are warmed by heating in a microwave oven. It is possible to provide a lunch box for heating in a microwave oven that can be deliciously reheated.

1 is a perspective view showing a container body, an inner container, and a lid in a separated state with respect to a lunch box for heating in a microwave oven according to an embodiment of the present invention; FIG. Fig. 3 is an enlarged perspective view showing a container main body and an inner container in a separated state; FIG. 3 is a vertical cross-sectional view showing the lunch box in a state in which the container body with the inner container fitted therein is covered with a lid body, with respect to the direction of arrows on the line AA in FIG. 2 ; FIG. 4 is a cross-sectional view taken along line CC in FIG. 3; 4A is an enlarged cross-sectional view taken along line DD of FIG. 3, and FIG. 4B is an enlarged cross-sectional view showing an exhaust passage, a communication passage, and a narrow passage. FIG. 3 is a vertical cross-sectional view showing the lunch box in a state in which the container body with the inner container fitted therein is covered with a lid body, with respect to the BB line arrow direction of FIG. 4A is an enlarged cross-sectional view taken along line EE of FIG. 3, and FIG. 4B is an enlarged cross-sectional view showing an exhaust passage, a communication passage, and an orifice; FIG. 1 shows the state of use of the lunch box, where (A) is a cross-sectional view showing the state in which foodstuffs are accommodated and carried, and (B) is a cross-sectional view showing the state in which water is retained in the water storage chamber for heating with a microwave oven. be. FIG. 4 is a cross-sectional view showing the action of the lunch box when it is heated in a microwave oven.

Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, the lunch box for microwave heating is composed of a container body 1, an inner container 2, and a lid 3, each of which is made of a plastic that can withstand microwave heating, such as polypropylene. integrally molded. In addition, it is preferable to provide a partition plate 4 which can partition the inner space of the inner container 2 so as to be divided.

(outer container)
The container body 1 comprises a bottom wall 5 which is substantially rectangular in plan view, and a top-opening container having a peripheral wall 6 rising from four sides of the bottom wall. It forms a flange 7 pointing outwards from the edge.

(inner container)
The inner container 2 comprises a bottom wall 8 which can be fitted inside the container body 1 and a peripheral wall 9 which rises from four sides of the bottom wall.

At this time, the bottom wall 8 of the inner container is provided with seat portions 10 positioned at the four corners and protruding downward. A lower peripheral wall 9a housed inside the peripheral wall 6 of the container body 1 and an extended peripheral wall 9b extending upward from the upper opening edge of the container body 1 and protruding from the lower peripheral wall 9a are integrally formed. The upper edge of 9b forms the opening edge 9c of the inner container.

As shown in FIG. 5, the extended peripheral wall 9b of the inner container 2 forms a thick-walled portion 11 located at the boundary connected to the lower peripheral wall 9a and having a projecting outer peripheral surface.

Furthermore, the inner container 2 is provided with eaves-like fins 12 protruding outward from the vicinity of the boundary between the lower peripheral wall 9a and the extended peripheral wall 9b at the four corners of the peripheral wall 9. As shown in FIG. In the illustrated embodiment, a fin 12 is provided at the position of the thick portion 11 .

(Lid body)
The lid body 3 includes a lid wall 13 covering the upper opening of the container near the opening edge 9c of the inner container 2, and a downward peripheral wall 14 surrounding the extended peripheral wall 9b of the inner container 2 from the periphery of the lid wall. It is configured so that the lower edge portion 14a of the downward peripheral wall is fitted into the opening edge portion of the container body 1 (the upper edge portion of the peripheral wall 6).

At this time, a band-shaped wall 15 is provided to surround the downward peripheral wall 14 from the outside, thereby forming a groove portion with an open bottom, and a seal packing 16 is held in the groove portion.

Further, the lid wall 13 is provided with a valve 17 made of silicon rubber or the like. The valve 17 constitutes a check valve, and when the lid wall 13 receives pressure from below, it passes upward. configured to prevent

As shown in FIG. 1, locking devices 18 are rotatably connected to the band-like walls 15 at positions facing each other on the lid wall 13 . Therefore, the upper opening of the container body 1 is covered with the lid 3 (that is, the lower edge portion 14a of the downward peripheral wall 14 is fitted into the upper edge portion of the peripheral wall 6 of the container body 1), and the lid 3 is pushed down. The locking member 18 can be locked to the flange 7 of the container main body 1 in a state where the seal packing 16 is crimped to the flange 7 by pressing. As a result, the internal space of the container body 1 can be hermetically and watertightly sealed by the lid 3 . Although this point is omitted from the drawings, it is a well-known technical configuration for a locking member in a lunch box.

(Assembly of lunch boxes)
As shown in FIGS. 3 to 7, the lunch box has an inner container 2 fitted inside a container body 1, a lid 3 is placed thereon, and a lower edge portion 14a of the downward peripheral wall 14 of the lid 3 is attached to the container body. 1, the seal packing 16 is placed on the flange 7 of the container body 1, and the lid 3 is pushed down to press the seal packing 16 against the flange 7, and the seal packing 16 is locked. It is assembled by locking the fitting 18 to the flange 7 of the container body 1 .

When using the lunch box, the inner container 2 contains cooked ingredients. At this time, by dividing the internal space of the inner container 2 with the partition plate 4, the cooked rice and the side dishes can be accommodated in a partitioned state.

In the assembled state, the bottom wall 8 of the inner container 2 is placed in a floating state on the bottom wall 5 of the container body 1 via the seat portion 10, forming a gap between the bottom walls 5 and 8 of both containers. A water storage chamber 19 is formed by the gap formed between the two.

Moreover, as shown in FIG. 4, the peripheral wall 9 of the inner container 2 is formed so as to extend in parallel along the peripheral wall 6 of the container body 1 in the circumferential direction. The formed gap constitutes the steam chamber 20 .

In the case of the illustrated embodiment, the steam chamber 20 is formed between the lower peripheral wall 9a of the inner container 2 and the peripheral wall 6 of the container body 1, and above it, the extended peripheral wall 9b of the inner container 2 and the lid 3. A communicating passage 21 is formed between the downward peripheral walls 14 . Therefore, the steam chamber 20 communicates with the opening of the inner container 2 via the communication passage 21 .

As shown in FIG. 4, the inner container 2 fitted inside the container main body 1 is centered inside the peripheral wall 6 of the container main body 1 with fins 12 provided at the four corners functioning as positioning means.

In this state, the portion of the steam chamber 20 whose upper part is covered with the fins 12 constitutes a pressure increasing chamber 20a. 20b.

FIG. 5 shows a cross section of the exhaust passage 20b portion of the steam chamber 20. The thick portion 11 is arranged between the exhaust passage 20b and the communication passage 21, and the thick portion 11 and the container body 1 are separated from each other. A narrow passage 22 is formed by a gap between the peripheral walls 6 of the .

Therefore, the width dimension W1 of the exhaust passage 20b, the width dimension W2 of the communication passage 21, and the width dimension W3 of the narrow passage 22 in the cross-sectional shape are formed to satisfy W1>W3>W2.

FIG. 7 shows a cross section of the pressure increasing chamber 20a portion of the steam chamber 20. The fins 12 are arranged between the pressure increasing chamber 20a and the communication passage 21, and the fins 12 and the peripheral wall of the container body 1 are arranged. A slight gap between 6 forms an orifice 23 .

Therefore, the width dimension W1 of the pressure intensifying chamber 20a, the width dimension W2 of the communication passage 21, and the width dimension W4 of the orifice 23 in the cross-sectional shape are formed to satisfy W1>W4>W2. Moreover, the width dimension W4 of the orifice 23 is significantly smaller than the width dimension W3 of the narrow passage 22, and W3>W4.

In the illustrated embodiment, the thick portion 11 and the fins 12 are provided from the peripheral wall 9 of the inner container 2 toward the peripheral wall 6 of the container body 1. may be provided toward the peripheral wall 9 of the

(Action)
FIG. 8 shows how the lunch box is used. FIG. 8(A) shows the state of carrying the lunch box, and FIG. 8(B) shows the state of heating the lunch box with a microwave oven. Cooked rice F1 and side dish F2 are contained in the food ingredients for the boxed lunch, which are accommodated inside the inner container 2 partitioned by the partition plate 4 respectively.

When heating the lunch box in the microwave oven, the lid 3 is opened from the state shown in FIG. 3 is covered, the container body 1 including the inner container 2 is sealed, and in this state, the container is placed in a microwave oven and heated in the microwave oven.

As shown in FIG. 9, by heating with a microwave oven, the water Q in the water reservoir chamber 19 is boiled, and the high-temperature steam rising in the steam chamber 20 is caused to enter the opening of the inner container 2 from the communication passage 21, and the pressure P The foodstuffs F1 and F2 can be heated and pressurized while applying the

FIG. 9 shows the pressure increasing chamber 20a in the left half and the exhaust passage 20b in the right half. The steam generated in the water storage chamber 19 in the pressure increasing chamber 20a is prevented from rising by the fins 12, so the pressure increases to a high pressure and enters the left and right exhaust passages 20b.

In the exhaust passage 20b, the steam generated from the water reservoir chamber 19 and the steam entering from the pressure increasing chamber 20a join together to increase the pressure and lead to the communication passage 21 through the narrow passage 22. The high-temperature, high-pressure steam rising through the communication passage 21 is directed from the opening edge 9c of the extended peripheral wall 9b of the inner container 2 along the lower surface of the lid wall 13, and flows toward the inside of the opening of the inner container 2. Multiply.

As a result, the foodstuffs F1 and F2 are steamed plumply and deliciously as if they were freshly made. In particular, the cooked rice F1 is heated while being pressurized while being replenished with water by steam, so that it is re-cooked as if it were freshly cooked.

The high-pressure steam in the pressure increasing chamber 20a is jetted through the orifice 23 into the communication passage 21 (indicated by reference numeral 21a in FIG. 9), thereby reducing the pressure in the communication passage 21a by the venturi effect. As a result, steam flows from the communication passage 21 (indicated by reference numeral 21b in FIG. 9), which is made high pressure by receiving the steam from the exhaust passage 20b, toward the low pressure communication passage 21a, thereby forming the communication passage 21. High-pressure steam can be spread over the entire periphery of the extended peripheral wall 9b, so that the opening of the inner container 2 can be evenly heated and pressurized.

Incidentally, since the pressure is automatically adjusted by the valve 17, the inside of the container body 1 is kept at an appropriate pressure.

The foodstuffs F1 and F2 that have been deliciously warmed by heating in the microwave oven can be served for meals by removing the lid 3 and using the same method as in the case of conventional lunch boxes.

1 container body 2 inner container 3 lid 4 partition plate

5 Bottom wall of container body 6 Peripheral wall of container body 7 Flange of container body 8 Bottom wall of inner container 9 Peripheral wall of inner container 9a Lower side peripheral wall 9b Extended peripheral wall 9c Opening edge 10 Seat portion 11 Thick portion 12 Fin 13 Lid body Lid wall 14 Downward peripheral wall 14a of lid body Lower end edge 15 Belt-shaped wall 16 Seal packing 17 Valve 18 Locking tool 19 Water pool chamber 20 Steam chamber 20a Pressure increasing chamber 20b Exhaust passage 21 Communication passage 22 Narrow passage 23 Orifice F1 Cooked rice F2 Side dish

Claims (4)

A container body (1) having an open top and having a bottom wall and a peripheral wall; an inner container (2) having an open top and having a bottom wall and a peripheral wall and being detachably fitted into the container body; It is composed of a lid body (3) that covers in a sealed state the opening of the container body in which the inner container is fitted, and is carried with the inner container containing cooked ingredients, and the microwave is applied to the container body. It is a lunch box that serves a meal in a state where the ingredients are warmed by microwave heating by irradiating
The container body and the inner container form a water storage chamber (19) between the bottom walls (5) and (8) of both containers (1) and (2), and between the peripheral walls (6) and (9) of both containers. A steam chamber (20) is formed in the inner container, and the steam chamber communicates with the opening of the inner container,
With water retained in the water reservoir (19), the container body (1) covered with the lid (3) is heated in a microwave oven to generate high-temperature steam rising in the steam chamber (20). It is configured to enter the inside of the vessel and pressurize the ingredients,
The steam chamber (20) is provided with fins (12) protruding from one of the peripheral walls (6) and (9) of the container body and the inner container in the shape of eaves toward the other. A lunch box for heating a microwave oven, characterized by comprising a pressure increasing chamber (20a) on the lower side of the fins and an exhaust passage (20b) on both sides of the pressure increasing chamber. The inner container (2) is integrally formed with an extended peripheral wall (9b) that protrudes upward from the upper opening edge of the container body (1) when fitted inside the container body (1),
The lid body (3) integrally includes a lid wall (3) covering the upper opening of the inner container and a downward peripheral wall (14) surrounding the outer periphery of the extended peripheral wall (9b) of the inner container from the periphery of the lid wall. and is configured to seal the opening of the container body with a seal packing (16) provided on the outer periphery of the downward peripheral wall,
A communication passage (21) is formed between the extended peripheral wall (9b) and the downward peripheral wall (14) for communicating the steam chamber with the opening of the inner vessel,
2. The lunch box for microwave oven heating according to claim 1, wherein the width W1 of the steam chamber (20) and the width W2 of the communication passage (21) in cross-section are W1>W2. . A narrow passage (22) is formed between the steam chamber (20) and the communication passage (21),
The width dimension W3 of the narrow passage (22) in the cross-sectional shape is formed to satisfy W1>W3>W2 with respect to the width dimension W1 of the steam chamber (20) and the width dimension W2 of the communication passage (21). The lunch box for microwave oven heating according to claim 2, characterized by: A fin (12) protruding from one of both peripheral walls of the container body and the inner container toward the other forms an orifice (23) by a gap between the tip of the fin and the other peripheral wall,
4. The electronic device according to claim 2 or 3, wherein the width dimension W4 of said orifice (23) in cross-sectional shape is W2>W4 with respect to the width dimension W2 of said communicating passage (21). Lunch box for microwave heating.

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