JP6557178B2 - Heater plate - Google Patents

Description

  The present invention relates to a heater plate, for example, a heater plate that appropriately retains or warms cooked food.

  At lunchboxes, cafeterias, restaurants, etc., the cooked food is provided on the shelf of the counter and then provided to the customer in turn. For example, at a lunch box shop, a system is adopted in which the lunch boxes that have been ordered are arranged at a counter next to the cash register, and the customer takes their lunch boxes in exchange for a numbered ticket.

  In employee cafeterias, etc., there is a system in which a lot of cooked foods are arranged on a shelf, and employees pick up their favorite dishes on their trays. The same is true for buffet-style restaurants.

  In the restaurant, dishes prepared by the person in charge of cooking are once arranged on the counter, and then the waiter sequentially carries them to the customer's table.

JP 2004-168361 A

There will be a large number of visitors at noon. In order to quickly process a large number of orders, the store side wants to take measures to prepare a certain amount of orders before cooking.
However, if cooked foods are arranged on the counter, the food temperature will drop and cool down before it reaches the customer's hands. Therefore, it is necessary to reheat it with a microwave oven, or put it in an insulating heat insulation box or a large incubator so that it does not cool down, but in any case, it requires labor, labor, time, and space. Therefore, improvement measures have been eagerly desired.

  An object of the present invention is to provide a heater plate that can be appropriately warmed or warmed so that the food does not cool if the cooked food is placed thereon.

The heater plate for heat insulation of the present invention is
A heater unit that generates heat by energization, and a base plate unit and a top plate unit that sandwich the heater unit from above and below,
When placing food in an insulating food container on the top surface of the top plate,
When the temperature TF of the bottom surface of the food container is compared with the temperature TV of the area where the food container is not placed on the top surface of the top plate portion,
The temperature TF of the bottom surface of the food container is at least 1 degree higher than the temperature TV.

  The temperature TF of the bottom surface of the food container is preferably 3 degrees or more higher than the temperature TV, and further the temperature TF of the bottom surface of the food container is 5 degrees or more higher than the temperature TV. Is more preferable.

In one embodiment of the invention,
The temperature TV of the area where the food container is not placed on the top surface of the top plate is 50 to 60 degrees,
The temperature TF of the bottom surface of the food container is preferably 60 to 75 degrees.

When the temperature TF of the bottom surface of the food container is higher than the temperature TV by 1 degree or more,
If the temperature TV is 50 to 60 degrees, the temperature TF on the bottom surface of the food container is 61 to 75 degrees.
Alternatively, if the temperature TV is 50 degrees to 59 degrees, the temperature TF of the bottom surface of the food container is 60 degrees to 75 degrees.
When the temperature TF of the bottom surface of the food container is 3 degrees or more higher than the temperature TV,
If the temperature TV is 50 to 60 degrees, the temperature TF on the bottom surface of the food container is 63 to 75 degrees.
Alternatively, if the temperature TV is from 50 degrees to 57 degrees, the temperature TF of the bottom surface of the food container is from 60 degrees to 75 degrees.
In addition, when the temperature TF of the bottom surface of the food container is 5 degrees or more higher than the temperature TV,
If the temperature TV is 50 to 60 degrees, the temperature TF on the bottom surface of the food container is 65 to 75 degrees.
Alternatively, if the temperature TV is 50 to 55 degrees, the temperature TF of the bottom surface of the food container is 60 to 75 degrees.

In one embodiment of the invention,
The top plate is preferably made of aluminum or an alloy containing aluminum as a main component.

In one embodiment of the invention,
It is preferable that a heat storage material is combined with the heater section.

In one embodiment of the invention,
It is preferable that a plurality of the heater units are provided, and set temperatures of the plurality of heater units are different from each other.

In one embodiment of the invention,
It is preferable that a part of the upper surface of the top plate portion has a region constituted by one or more selected from glass, silicone, and stainless steel.

In the present invention,
A film having a thickness of 0.01 mm to 2 mm is preferably attached to the upper surface of the top plate portion.

In the present invention,
Furthermore, it has a foldable cover placed on the top surface of the top plate portion,
The foldable cover is
Cover parts that become semi-cylindrical by curving,
A lid part that is attached so as to close one end side of the covering part that is semicylindrical,
The covering parts are
A flexible sheet body;
When the direction perpendicular to the main axis of the semi-cylindrical is the width direction, the sheet body has a length in the width direction and a plurality of cores arranged at intervals in the main axis direction. ,
The core has a property of deforming when a force is applied and retaining a shape when the force is released,
In the core,
There are a round core having a circular cross section and bending in any direction, and a flat core having a flat plate shape in which the bending direction is limited to one direction, and at least half of the cores are preferably flat cores.

In the present invention,
Of the cores of the covering part, the cores at both ends are preferably the round cores, and the other cores are preferably the flat cores.

The counter according to the present invention is characterized in that the food warming heater plate is arranged on a top surface or a shelf.

  In the cart of the present invention, it is preferable to arrange the food warming heater plate on a shelf.

It is an external appearance perspective view of a heater plate. It is a figure which shows the state which lifted the top-plate part of the heater plate. It is a figure which shows the back surface of a top-plate part. It is an exploded view of a heater part. It is a figure which illustrates the use condition of a heater plate. It is a figure for demonstrating the effect | action of a heater plate. It is a figure which illustrates the combination with a thermal storage material. It is a figure which illustrates the combination with a thermal storage material. It is a figure which illustrates the combination with the thin plate of aluminum. It is a figure which shows the example which uses the some heater part from which temperature setting differs. It is a figure which shows an example by changing a part of top plate part into glass, silicone, and stainless steel. It is a figure which shows the example which changes the distance of a heater part and a top-plate part. It is a figure which shows the modification of how to provide an area | region. It is a figure which illustrates the trolley | bogie which attached the heater plate. It is a figure which shows the modification which abbreviate | omitted the side wall part. It is a figure which illustrates the form which affixed the film on the upper surface of a top-plate part. It is a figure which shows a mode that the lunch box is covered and heat-retained with a foldable cover. It is a figure which shows three parts of a cover. It is a figure which shows the back surface of a cover. It is a figure which shows the state which pulled out the core 571-578 a little. It is a figure which represents deformation | transformation of a round core typically. It is a figure which represents deformation | transformation of a flat core typically. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover. It is a figure for demonstrating the assembly operation of a cover.

(First embodiment)
A heater plate according to a first embodiment of the present invention will be described.
FIG. 1 is an external perspective view of the heater plate 100.
The heater plate 100 is simply a flat plate in appearance.
FIG. 2 is a view showing a state where the top plate 150 of the heater plate 100 is lifted.
The heater plate 100 includes a base plate portion 110, a top plate portion 150, and a heater portion 160.

The base plate part 110 includes a rectangular flat plate 120 and a side wall part 140 provided on a side surface of the rectangular flat plate 120.
The side wall part 140 is provided on three side surfaces of the four side surfaces of the rectangular flat plate 120. The side wall 140 is a prism (actually a square cylinder) having a height higher than that of the rectangular flat plate 120. The side wall 140 surrounds the rectangular flat plate 120 by the three side walls 140, and defines the accommodating space 130 inside thereof. Here, side wall portions 140 are provided on two short sides and one long side of the rectangular flat plate 120.

The side wall 140 provided on the short side of the rectangular flat plate 120 is referred to as a short side wall 140S, and the side wall 140 provided on the long side is referred to as a long side wall 140L.
The end portions of the short side wall portion 140S and the long side wall portion 140L are joined by a corner member 141 made of plastic (resin).
The width of the corner member 141 is slightly larger than the width of the side wall part 140, and projects slightly outward from the side wall part 140. This is a device for preventing the side wall portion 140 and the top plate portion 150 from coming into direct contact.

Of the side surfaces of the rectangular flat plate 120, the side surface without the side wall portion 140 is referred to as an open side surface 122.
A short protrusion 142 made of plastic (resin) is attached to an end of the short side wall 140S on the open side 122 side so as to extend.
A space is formed by the open side 122 without the side wall 140 and the short protrusion 142, and this space is used for routing the wiring of the heater unit 160.

The rectangular flat plate 120 and the side wall portion 140 of the base plate portion 110 are made of aluminum or an aluminum alloy containing aluminum as a main component.
Aluminum or aluminum alloy is preferable in view of weight, rigidity, and price. Of course, the base plate portion 110 may be formed of a metal such as iron, stainless steel, or copper. However, considering the weight that can be carried, the price, etc., aluminum is preferable even with the same metal.
Incidentally, since the base plate portion 110 may not have thermal conductivity, the base plate portion 110 may be formed of resin (plastic). However, the base plate portion 110 needs to be strong enough to support the heater portion 160 and the top plate portion 150, and further needs to maintain a sufficient strength even when heat is applied from the heater portion 160. Considering this, it can be said that aluminum is preferable as a material of the base plate portion 110.

In FIG. 3, the back surface of the top plate portion 150 appears.
The top plate 150 is a rectangular aluminum thin plate having low walls on four sides.
The top plate 150 is configured to cover the base plate 110 from above just like a lid. As a material for the top plate 150, aluminum or an alloy thereof is suitable in consideration of heat conductivity, weight, strength, and price.

Stainless steel is also a suitable material for the top plate 150.
In particular, when ferritic stainless steel (for example, SUS329J1, SUS405, SUS430, SUS430LX) is used, it can be expected that ferrite exhibits a heat storage effect.
In addition, glass or silicone resin may be adopted.

As shown in FIGS. 2 and 3, the heater unit 160 is disposed in the accommodation space 130 of the base plate unit 110.
Here, the two heater parts 160 are arranged side by side.
FIG. 4 is an exploded view of the heater unit 160.
The heater unit 160 includes a film heater 161, a heat insulation board 163, and an outer bag 166.
The film heater 161 is formed by wiring the heating wire 162 in a meandering manner on a thin resin film.
Here, as the performance of the film heater 161, the temperature rises to 85 ° C.
However, as will be described later, the goal is to finally set the temperature of the upper surface of the top plate 150 to 50 ° C. to 60 ° C. The material and thickness of the outer bag 166, the material and size of the top plate 150, etc. In consideration of the above, the temperature of the film heater 161 is set.

The heat insulation board 163 is combined with the lower surface of the film heater 161.
The heat insulation board 163 is provided with a connection terminal 164 for making contact with the heating wire 162 of the film heater 161, and an electric cord 165 extending from the connection terminal 164 is wired.
The heat insulating board 163 prevents heat from the film heater 161 from flowing to the base plate portion 110 on the back surface.

  The outer bag 166 is a bag for integrating the film heater 161 and the heat insulation board 163 together.

Here, for example, as shown in FIG. 2, when the heater portion 160 is disposed in the accommodation space 130 of the base plate portion 110, the heater portion 160 is slightly higher than the side wall portion 140.
For example, the upper surface of the heater part 160 is about 1 mm-2 mm higher than the upper surface of the side wall part 140. That is, when the top plate 150 is covered from the top after the heater unit 160 is disposed in the accommodation space 130 of the base plate 110, the back surface of the top plate 150 and the top surface of the heater unit 160 are in direct contact.

FIG. 5 is a diagram illustrating the usage state of the heater plate 100.
In FIG. 5, a salesclerk 310 serves several customers 320 across the kitchen counter 300.
The kitchen counter 300 is basically an existing stainless steel kitchen counter set.
However, the heater plate 100 of this embodiment is arranged on the top plate of the kitchen counter 300.
Here, four heater plates 100 are arranged side by side. Furthermore, the shelf plate of the kitchen counter 300 is replaced with the heater plate 100 of this embodiment.
A plurality of cooked lunches 330 are placed on the heater plate 100.

FIG. 6 is a view for explaining the operation of the heater plate 100.
When the heater unit 160 of the heater plate 100 is energized, the heater unit 160 generates heat.
This heat is transmitted to the top plate 150, and the top plate 150 becomes hot.
Note that the top plate portion 150 is the only metal material (heat transfer material) that is in direct contact with the heater portion 160, and almost all the heat quantity of the heater portion 160 is transferred to the top plate portion 150.

One of the points of this embodiment is that the temperature of the top plate 150 is suitably set in consideration of when food is provided at a store.
When nothing is placed on the top plate 150, the temperature of the upper surface of the top plate 150 is set to 50 ° C to 60 ° C.
Considering the balance between the amount of heat generated by the heater unit 160 and the area of the top plate unit 150 (that is, the amount of heat release), the heater unit 160 and the top plate are set so that the temperature of the top surface of the top plate unit 150 is 50 ° C to 60 ° C It is possible to design the part 150 itself.
There is a possibility that when the clerk 310 or the customer 320 extends his / her hand, his / her hand may directly touch the top plate 150 of the heater plate 100. However, if the temperature is 50 ° C. to 60 ° C., it is slightly warm. Therefore, although it is safe, it is difficult to say that the food is properly warmed or warmed at 50 ° C to 60 ° C. To keep the food hygienic, it is necessary to warm or warm at 65 ° C to 75 ° C. It is considered ideal.

Here, the present inventors have obtained one idea.
The material of the food container is typically a resin such as polystyrene or polypropylene.
In some cases, paper may be used.
Considering a plate, it is ceramic.
All of these food containers have heat insulation properties.
When these food containers are placed on the top surface of the top plate portion 150, heat is not diffused from the top surface of the top plate portion 150, but heat is accumulated on the bottom surface of the food container.
As a result, when the temperature of the bottom surface of the food container is measured, it reaches 65 ° C to 75 ° C.
However, when polystyrene or polypropylene used for food containers reaches 80 ° C. or higher, the containers deform or melt.
Therefore, the bottom surface of the food container must not exceed 80 ° C.
Considering this, when the temperature of the upper surface of the top plate portion 150 is set to 50 ° C. to 60 ° C., the temperature of the bottom surface of the food container keeps an ideal 65 ° C. to 75 ° C.

Of course, this has some relationship with the shape of the bottom surface of the food container.
It is preferable that the bottom surface of the food container has a contact area with a certain extent so as not to allow heat to escape from the top surface of the top plate 150.
Simply speaking, the bottom surface of the food container should be flat, but the contact area should be sufficient even when unevenness is provided. Alternatively, the container may have a hill, but it is preferable that the container has a closed ring so as not to release heat inside the hill.

Prior to the present invention, there has been known an apparatus for warming or heating food using a heater.
However, in the conventional incubator, the plate portion serving as a heater is set to 65 ° C. to 75 ° C., and for example, the thermostat is finely controlled on and off to prevent overheating at 80 ° C. or higher.
Simply speaking, it is somewhat difficult in terms of safety if a metal plate of 65 ° C to 75 ° C (or 80 ° C) is exposed to the counter. Therefore, the conventional warmer has a countermeasure such as having a door or preventing the customer from opening and closing. However, when such measures are required, an increase in size and price is inevitable.

Further, if the metal plate at 65 ° C. to 75 ° C. is exposed as it is, the temperature difference from the room temperature (for example, 20 ° C. to 30 ° C.) is large, so that the heat dissipation speed becomes extremely high.
Not only the area where the food is placed, but also the whole metal plate becomes 65 ° C to 75 ° C to dissipate heat. This is a major problem in terms of energy efficiency. Due to these various problems, until now, there has been no food insulation or heating heater installed on the counter.

In this regard, in the present embodiment, the temperature of the upper surface of the top plate 150 is 50 ° C to 60 ° C.
Thereby, safety and energy saving can be realized.
On the other hand, when the food container is placed, only the region in contact with the bottom surface of the food container is 65 ° C to 75 ° C.
It can keep food deliciously and is the ideal temperature for hygiene.
In this embodiment, it is not necessary to enclose as in a conventional thermostatic bath, and it can be accommodated in a single heater plate 100 that is simple in appearance. Therefore, it becomes possible to charge the upper surface and the shelf of the counter, and the installation space of the heater plate 100 of this embodiment is almost zero.
Further, the customer 320 himself / herself only needs to pick up the food (such as the lunch box 330) on the heater plate 100, thereby saving the labor of the store clerk 310 and improving the operation efficiency of the store.

In addition, it is one preferred embodiment that the difference between the temperature of the top surface of the top plate 150 and the temperature of the area where the bottom surface of the food container is in contact is 5 degrees or more, but it is not necessarily 5 degrees or more. It doesn't stick to.
For example, if the top plate 150 has a high thermal conductivity such as aluminum or an aluminum alloy, the difference between the temperature of the top surface of the top plate 150 and the temperature of the bottom surface of the container may be 5 degrees or more. However, there may be a demerit that heat dissipation is somewhat large.
On the other hand, when the top plate 150 is made of stainless steel, the thermal conductivity of stainless steel is smaller than that of aluminum, so the difference between the temperature of the top surface of the top plate 150 and the temperature of the bottom of the container is relatively small, 3 degrees or more, or It may be more than once. When the top plate portion 150 is made of stainless steel, particularly ferritic stainless steel, a heat storage effect can be expected, and since heat radiation is reduced, an effect of lowering power consumption can be expected.

(Second Embodiment)
As the second embodiment of the present invention, the heat storage material 171 may be combined.
For example, as illustrated in FIG. 7, the heat storage material 171 may be disposed immediately below the film heater 161, and the heat storage material 171 may be sandwiched between the film heater 161 and the heat insulation board 163.
Alternatively, as illustrated in FIG. 8, a heat storage material 172 may be sandwiched between the heater unit 160 and the top plate unit 150.
By setting it as such a structure, even if it cuts electricity, the heater plate 100 can maintain the heat retention effect with the heat | fever stored.
Since the heater plate 100 of the present invention is slow in heat dissipation, the heat retaining effect is maintained for a certain time even with the heat of the heat storage material 171.
For example, the heater plate 100 of the present invention can be used even when it is difficult to secure a power source for mobile sales or opening a store.

In FIG. 9, when the top plate 150 is made of, for example, stainless steel, glass, or silicone resin, a thin plate 173 made of aluminum or an aluminum alloy is sandwiched between the heater 160 and the top plate 150.
Thereby, even if the thermal conductivity of the top plate 150 itself is slightly low, the entire top plate 150 is heated uniformly.

(Third embodiment)
As illustrated in FIG. 10, a plurality of heater units 210, 220, and 230 having different temperature settings may be used.
In FIG. 10, three heater portions 210, 220, and 230 are disposed in the accommodation space 130 of the base plate portion 110.
The temperatures of the first heater unit 210, the second heater unit 220, and the third heater unit 230 can be set individually, and the set temperatures are made different from each other.
At this time, surroundings 151, 152, 153 and colors may be applied to the top surface of the top plate 150 so that the correspondence with the first, second, and third heaters 210, 220, 230 can be seen visually. Good.

As temperature settings for the first heater unit 210, the second heater unit 220, and the third heater unit 230, the corresponding regions of the top plate unit 150 are 40 ° C.-45 ° C. (relatively low temperature), 50 ° C.-55 ° C. ( As an example, an intermediate temperature is set to 60 ° C. to 65 ° C. (relatively high temperature).
Depending on the food, you can keep the food warm at the appropriate temperature.

(Fourth embodiment)
In the first embodiment, the top plate 150 is entirely made of aluminum, but the material may be partially changed to change the thermal conductivity.
For example, as shown in FIG. 11, a part of the top plate 150 may be changed to glass 155, silicone 156, and stainless steel 157.
Even if the heat supplied from the heaters 160, 210-230 or the heat storage material 172 is the same, a difference in temperature is created in each region of the top plate 150 due to differences in materials such as glass 155, silicone 156, and stainless steel 157. Can do.

Note that the third embodiment and the fourth embodiment may be combined.
That is, a difference in materials such as glass 155, silicone 156, and stainless steel 157 may be provided on the first heater unit 210, the second heater unit 220, and the third heater unit 230 having different temperature settings.

(Fifth embodiment)
In addition, as illustrated in FIG. 12, the temperature of each region of the top panel 150 may be changed by changing the distance between each heater unit 210-230 and the top panel 150.
Although not shown, materials having different thermal conductivities such as glass 155, silicone 156, and stainless steel 157 may be sandwiched between the heaters 210-230 and the top plate 150.

(Sixth embodiment)
When creating regions with different temperatures on the top plate 150, the method of division is not limited, and for example, four regions may be provided as shown in FIG.

(Seventh embodiment)
FIG. 14 shows an example in which the heater plate 100 of the present invention is attached as a shelf of a carriage 400.
When the heater plate 100 is attached as a shelf of the hand cart 400 as described above, warm food can be provided by a wagon service.
Convenient for banquet halls and in-car sales.

(Eighth embodiment)
Although the base plate portion 110 is provided with the side wall portion 140, the side wall portion 140 may be omitted as shown in FIG.

(Ninth embodiment)
In the embodiment and the modification so far, it has been assumed that a lunch box or the like is placed on the top surface of the metal top plate portion 150 as it is. However, as illustrated in FIG. A film 158 may be attached. There are mainly three points as the operational effects by attaching the film 158 to the upper surface of the top plate 150.

The first point is the warm feeling when touched.
The metal top plate 150 has a thermal conductivity of about 200 W / (m · K).
If a person's hand or finger touches a material with high thermal conductivity, it will easily feel hot even at the same temperature. Therefore, the film 158 is preferably attached to the top surface of the top plate 150 in order to reduce the warm feeling when touched even at the same temperature.
The thickness of the film 158 varies depending on the material, but is about 0.01 mm to 10 mm, for example. Of course, it is good also as a thing of about 0.01 mm-5 mm, and about 0.01 mm-2 mm.
If the film 158 is polyester (for example, PET: polyethylene terephthalate), it is preferable to set the thickness to about 100 μm to 200 μm.
If it is too thin, the effect of improving warmth is weakened. If it is too thick, the heat dissipation on the top surface of the top plate 150 may be hindered, and the temperature may increase excessively. That is, there is a possibility that the operational effect of the present invention, in which a temperature difference is created between the area immediately below the lunch box and the area without the lunch box, becomes insufficient.
The material of the film 158 is not particularly limited, and may be a silicone film, for example.

The second merit of applying the film 158 is to improve sliding.
When the lunch is placed directly on the upper surface of the metal top plate 150, the lunch of the lunch may be slightly poor. If it slips and gets caught, it may be overturned when the customer lifts the lunch or when the store clerk wants to rearrange the lunch.
In this respect, the heater unit 100 becomes easier to use by attaching a film 158 such as PET having a small friction coefficient.

A third merit of applying the film 158 is protection of the top plate 150. If it is a film 158, it is easy to replace it even if it is damaged or dirty.
In addition, there is an advantage that fingerprints and dirt are hard to be attached compared to metal, or fingerprints and dirt are inconspicuous.

(10th Embodiment)
In the tenth embodiment, a foldable cover 500 suitable for combination with the heater plate 100 will be described.
Heating or heating can be performed if food (such as a lunch box) is placed on the heater plate 100, but for example, as shown in FIG. .
Since the heater plate 100 has a flat plate shape and is convenient for movement, the cover 500 is preferably foldable and has excellent portability.
The foldable cover 500 will be described with reference to FIGS.

FIG. 17 is a diagram illustrating a state in which the lunch box is covered with the foldable cover 500 and heat is maintained.
A semi-cylindrical foldable cover 500 is installed so as to cover the lunch box 330 on the heater plate 100. The foldable cover 500 has a semi-cylindrical shape and is closed at one end and opened at the other end.

Now, as shown in FIG. 17, the foldable cover 500 is semi-cylindrical as shown in FIG. 17 and has a length, height, and width. However, the foldable cover 500 can be easily carried when disassembled and folded.
First, the foldable cover 500 is configured by a combination of three parts 510, 550, and 580 as shown in FIG.
The three parts will be referred to as a lid part 510, a first covering part 550, and a second covering part 580 in order from one end.
As a material constituting the lid part 510, the first covering part 550, and the second covering part 580, any material may be used as long as it has flexibility such as a woven fabric (cloth).
About the back surface of these parts 510, 550, and 580, as illustrated in FIG. 19, an aluminum foil is pasted so that heat can be kept warm. And a heat insulating material (not shown) is sandwiched between the front fabric and the aluminum foil on the back surface.
A flexible thin plate (cloth) composed of a woven fabric sandwiched with a heat insulating material and amyl foil is referred to as a sheet body.

First, the lid part 510 will be described.
The lid part 510 has a lid part 520 and an edge part 530.
The lid portion 520 is semicircular, and a fastener (line fastener 521) is attached to the arc portion.
The edge portion 530 has a strip shape like a strip, and is continuously attached at a position corresponding to the diameter of the lid portion 520.
Both ends of the edge portion 530 protrude so as to protrude from the lid portion 520, and a hook-and-loop fastener 531 is provided on the protruding portion on the back surface (FIG. 19).

The first cover part 550 and the second cover part 580 will be described.
The first cover part 550 and the second cover part 580 are generally rectangular flat plates and are curved to form a semi-cylindrical dome as shown in FIG.
However, in order to maintain the shape in a curved state, the first cover part 550 and the second cover part 580 have flexible cores 571-578 as shown in FIG.
Here, assuming that the semi-cylindrical axial direction when the foldable cover 500 is used is the main axis direction, and the direction perpendicular to the main axis direction is referred to as the width direction, the first cover part 550 and the second cover part 580 are used. Is a rectangle whose width direction is slightly longer than the main axis direction.

The first cover part 550 and the second cover part 580 will be described in order.
The first cover part 550 has a rectangular flat plate shape.
A wire fastener 551 is provided on one side of the first cover part 550.
The line fastener 551 is coupled to the line fastener 521 of the lid part 510.
When the back side of the first cover part 550 is viewed as shown in FIG. 19, the hook-and-loop fastener 553 is provided in a short parallel manner at both ends in the width direction near the side on one end side.
The hook-and-loop fastener 553 is combined with the hook-and-loop fastener 531 of the lid part 510.

The first cover part 550 is provided with four belt-like bag portions 561-564 parallel to each other.
These belt-shaped bag portions will be referred to as a first bag portion 561, a second bag portion 562, a third bag portion 563, and a fourth bag portion 564 in order from the rear side.
Each bag part 561-564 is provided long and narrow along the width direction.
FIG. 20 is a diagram illustrating a state in which the core 571-574 inserted into the bag portion 561-564 is slightly pulled out.
Now, rod-shaped round cores 571 and 574 having a circular cross section are inserted into the first bag portion 561 and the fourth bag portion 564 at both ends in the axial direction of the first cover part 550.
On the other hand, flat flat cores 572 and 573 are inserted into the second bag portion 562 and the third bag portion 563 that are not both ends in the axial direction of the first cover part 550.
One of the features of this embodiment is that the round cores 571 and 574 and the flat cores 572 and 573 are used in combination.

First, the round cores 571 and 574 have a diameter of about 0.9 mm and are formed by coating an aluminum core wire with a resin.
Since the aluminum has a small diameter, it can be bent and stretched with a little force as shown in FIG. 21, and the shape is maintained.
Moreover, since the cross section is circular, it can be bent in any direction.

On the other hand, the flat cores 572 and 573 are polyethylene sheets formed by stretching having a thickness of about 0.5 mm to 1.0 mm and a width of about 300 mm to 500 mm.
It can be bent freely and can keep its shape.
However, since it is flat, the bending direction is limited to only one direction as schematically shown in FIG.
Although it is difficult to express the direction of bending with words, it is bent only in the pitching direction as seen in FIG.

The second cover part 580 has a rectangular flat plate shape.
The size of the second cover part 580 is substantially the same as that of the first cover part 550, and has four belt-shaped bag portions 565-568 that are parallel to each other, like the first cover part 550.
These belt-shaped bag portions 565 to 568 will be referred to as a fifth bag portion 565, a sixth bag portion 566, a seventh bag portion 567, and an eighth bag portion 568 in order from the rear side.
A round core 578 and a flat core 575-577 are also inserted into the bag portions 565-568. A flat core 575-577 is inserted in the fifth bag portion 565, the sixth bag portion 566, and the seventh bag portion 567 on one end side, and a round core 578 is inserted in the eighth bag portion 568 on the other end side. Has been inserted.

The lid part 510, the first cover part 550, and the second cover part 580 separated into three parts are combined into the foldable cover 500.
First, as shown in FIG. 23, the line fastener 521 of the lid part 510 and the line fastener 551 of the first cover part 550 are joined together.
At this time, when the round core 571 is inserted into the first bag part 561 of the first cover part 550, the round core 571 is curved along the arc of the lid part 520 of the lid part 510.
As illustrated in FIG. 24, the round core 571 maintains a shape in a curved state and serves as a core that supports one end of the foldable cover 500.

Further, as shown in FIGS. 25 and 26, the hook-and-loop fastener 531 of the lid part 510 and the hook-and-loop fastener 553 on the back surface side of the first cover part 550 are combined.
Then, one end of the semi-cylinder of the foldable cover 500 is closed with the lid part 510. Then, the flat cores 572 and 573 inserted in the second bag portion 562 and the third bag portion 563 and the round core 574 inserted in the fourth bag portion 564 are curved, and as shown in FIG. The part 510 and the first cover part 550 are formed in a semi-cylindrical shape.
At this time, since the flat cores 572 and 573 are bent only in one direction, distortion and twisting are unlikely to occur, and if a little force is applied with an appropriate side of the first covering part 550, a clean as shown in FIG. It becomes a semi-cylinder.

  Note that a unit obtained by combining the lid part 510 and the first cover part 550 is referred to as a first cover unit 505.

Next, as shown in FIGS. 28 and 29, the second covering part 580 is bent so as to be a semi-cylinder.
Also in this case, since the flat cores 575-577 inserted in the fifth bag portion 565, the sixth bag portion 566, and the seventh bag portion 567 are bent only in one direction, the second cover is difficult to be distorted or twisted. If a little force is applied with the appropriate side of the part 580, a beautiful semi-cylinder as shown in FIG. 29 is obtained.

  When the second cover part 580 is partially overlapped on the half cylinder of the first cover part 550, the semi-cylindrical foldable cover 500 shown in FIG. 17 is completed.

Such a foldable cover 500 can be separated into three parts and is convenient to carry.
When carrying it as a foldable cover 500, it can be assembled into a semi-cylindrical dome.
Such portability is suitable for use in combination with the flat heater plate 100.

Further, since the shape of the foldable cover 500 is held by the cores 571-578 when assembled, a space can be secured between the cover 500 and the food (lunch) 330, and the food (lunch) 330 is taken in and out. Convenient for. Here, the cores 571-578 are essential for maintaining the shape, but they may be difficult to handle due to the presence of the cores.
For example, if the lead bends freely in any direction, it may not be able to be restored after being folded once.
If multiple cores (for example, 8 cores) are turned around or bent, it may be difficult to handle.
In this respect, in this embodiment, the flat cores 572, 573, and 575-577 are appropriately used to restrict the direction of bending to some extent. Therefore, anyone can easily assemble and fold the foldable cover 500 of the present embodiment without special practice.

  On the other hand, if all the flat cores 572, 573, and 575-577 are used, variations in form during use and transportation are extremely limited. In this respect, in the present embodiment, the round cores 571, 574, and 578 are appropriately combined to ensure the degree of freedom of shape.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Heater plate, 110 ... Base plate part, 120 ... Rectangular flat plate, 122 ... Open side surface, 130 ... Housing space, 140 ... Side wall part, 140L ... Long side wall part, 140S ... Short side wall part, 141 ... Corner member, 142 ... Projection part, 150 ... top plate part, 151,152,153 ... enclosure, 155 ... glass, 156 ... silicone, 157 ... stainless steel, 160 ... heater part, 161 ... film heater, 162 ... heating wire, 163 ... insulation board, 164 ... Connection terminal, 165 ... Electric cord, 166 ... Outer bag, 171 ... Heat storage material, 172 ... Heat storage material, 210 ... Heater part, 220 ... Heater part, 230 ... Heater part, 300 ... Kitchen counter, 310 ... Clerk, 320 ... customers, 330 ... lunch boxes, 400 ... carts,
500 ... Foldable cover,
510 ... Lid parts, 520 ... Lid, 521 ... Line fastener, 530 ... Edge, 531 ... Hook fastener,
550 ... first covering parts, 551 ... line fastener, 553 ... hook and loop fastener,
561-568 ... bag part,
571-578 ... core,
580 ... Second cover part.

Claims (11)

A heater portion that generates heat by passing electricity,
A base plate portion and a top plate portion sandwiching the heater portion from above and below,
The base plate portion has a rectangular flat plate, and a side wall portion provided on a side surface of the rectangular flat plate,
The rectangular flat plate and the side wall are formed of a metal material,
And the height of the side wall part is slightly lower than the height of the heater part,
The top plate portion is a rectangular thin plate formed of a metal material having a wall on a side surface so as to cover the base plate portion like a lid,
There is a gap between the base plate portion and the top plate portion, and both do not contact directly,
When placing food in an insulating food container on the top surface of the top plate,
When the temperature TF of the bottom surface of the food container is compared with the temperature TV of the area where the food container is not placed on the top surface of the top plate portion,
The food heat retaining heater plate, wherein the temperature TF of the bottom surface of the food container is 5 degrees or more higher than the temperature TV. In the food warming heater plate according to claim 1,
The corner portion of the rectangular flat plate in the side wall portion of the base plate portion is provided with a resin corner member having a shape protruding slightly outward from the side wall portion,
The side wall portion of the base portion and the wall of the top plate portion are not in direct contact and face each other in close proximity.
A heater plate for keeping food warm. In the heater plate for food insulation according to claim 1 or 2,
A film having a thickness of 0.01 mm to 10 mm is attached to the upper surface of the top plate portion.
A heater plate for keeping food warm. In the food warming heater plate according to any one of claims 1 to 3 ,
The temperature TV of the area where the food container is not placed on the top surface of the top plate is 50 to 60 degrees,
Food warmth heater plate, wherein the temperature TF of the bottom surface of the food container is 75 degrees 6 5 degrees. In the food warming heater plate according to any one of claims 1 to 4 ,
The top plate of aluminum, an alloy mainly containing aluminum, or food kept heater plate, characterized in that are made form in stainless. In the food warming heater plate according to any one of claims 1 to 5 ,
A heat storage material is combined with the heater section. A heater plate for keeping food warm. In the food warming heater plate according to any one of claims 1 to 6 ,
A food warming heater plate, comprising a plurality of the heater portions, wherein the set temperatures of the plurality of heater portions are different from each other. In the food warming heater plate according to any one of claims 1 to 7 ,
Furthermore, it has a foldable cover placed on the top surface of the top plate portion,
The foldable cover is
Cover parts that become semi-cylindrical by curving,
A lid part that is attached so as to close one end side of the covering part that is semicylindrical,
The covering parts are
A flexible sheet body;
When the direction perpendicular to the main axis of the semi-cylindrical is the width direction, the sheet body has a length in the width direction and a plurality of cores arranged at intervals in the main axis direction. ,
The core has a property of deforming when a force is applied and retaining a shape when the force is released,
In the core,
There are a round core having a circular cross section and bending in any direction, and a flat core having a flat shape in which the bending direction is limited to one direction, and at least half of the cores are flat cores. plate. In the food warming heater plate according to claim 8 ,
Of the cores of the covering part, the cores at both ends are the round cores, and the other cores are the flat cores. 10. A counter set, wherein the food warming heater plate according to claim 1 is arranged on a top surface or a shelf.     A cart, wherein the food heat retaining heater plate according to any one of claims 1 to 9 is arranged on a shelf.