JPH05340549A - Cordless heat retaining heater - Google Patents

Abstract

PURPOSE:To obtain a cordless heat retaining heater not requiring any control circuit by using a battery as a power supply and a positive temperature coefficient thermistor as a heating unit, capable of being used at relatively low temperature for long time. CONSTITUTION:A heating unit 1 is a positive temperature coefficient thermistor PTC which is ceramic moldings whose main component is barium titanium. Conductors 8 are extended from metal electrodes 2, 3 on the upper and lower surfaces of the heating body 1 to be connected to a socket 9. The heater is heated by inserting a plug 12 on an end of a cord connected to electrodes of a battery 10 to the socket 9. The PTC heating unit has safety because its temperature is kept low, and the material itself has a temperature control function, so that thermostat is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless heat-retaining heater for keeping foods warm at parties and parties.

[0002]

2. Description of the Related Art The food and liquor provided at various banquets and parties have a long time until the meal starts and the time for the meal itself is long. .. On the other hand, it is hard work for a person in charge to put warm foods on the table all together after the meal starts.

From such a point of view, it has been conventionally practiced to set the solid fuel under a pan or the like, and ignite the solid fuel to heat it after the meal starts. The time is short, about 30 minutes, and the heat power cannot be adjusted, so it is not suitable for heat retention. Since a flame is emitted, there is a great risk of fire as a means of heat retention, and since it is necessary to increase the height of the container for keeping heat, it lacks stability and is troublesome to handle.

As a heat-retaining device using electric heat, the actual Kaihei 3
There is a sake smoker described in Japanese Patent Publication No. 103589.
This has the advantage that the temperature can be adjusted, but since the power is supplied from a commercial power source, the cord is an obstacle, it looks bad, and the heater is an obstacle when pouring sake.

Further, in the case of using an electric heater, in order to keep the temperature constant at a relatively low temperature, control by a thermostat or the like is required, and the circuit becomes complicated.

[0006]

DISCLOSURE OF THE INVENTION Problems to be solved by the present invention are cordless heat retention, which is highly safe and is capable of keeping heat at a relatively low temperature for a sufficiently long time without the need for a control circuit. The purpose is to provide a heater.

[0007]

In order to solve the above problems, the cordless heat retention heater of the present invention uses a battery as a power source and a positive temperature characteristic thermistor (hereinafter referred to as PTC).
Was used as the heating element. The battery can be stored behind or under the table, or in a decoration on the table. In addition, a plug for receiving electricity is provided on the heating element side, an outlet into which the plug is inserted can be provided on the dining table, and the electrode of the battery can be connected to the outlet. In this case,
The plug may be directly fixed to the heating element.

[0008]

Since the PTC is used as the heating element, the object to be heated is kept at a constant temperature by the self-temperature control function. A battery is provided for each dining table, so there is no need for a code to the dining table and it does not get in the way.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on the embodiments shown in the drawings.

FIG. 1 is a schematic view showing the structure of a cordless heat retention heater according to the present invention.

In the figure, reference numeral 1 denotes a heating element made of PTC, which is made of, for example, ceramics containing barium titanate as a main component and molded into a 100 mm square. Metal electrodes 2 and 3 are bonded to the front and back surfaces of the heating element 1 with a conductive adhesive, and an insulating plate 4 is bonded to the upper metal electrode 2. Below the lower metal electrode 3 is a heat insulating material 5.
Is attached to increase the efficiency of heat transfer to the upper part. 6 is a heating plate on which food, pots, bowls, etc. are placed. Reference numeral 7 is a bottom plate made of a heat insulating material. A conductive wire 8 extends from the metal electrodes 2 and 3 and is connected to a socket 9. On the other hand, the table T is provided with a portion for accommodating the battery 10 at a place where it does not interfere with a person, and a plug 12 is provided at the tip of the cord 11 connected to the electrode of the battery. The heater is made to generate heat by being inserted into the heater 9.

The battery is a general 12V-10Ah.
It was possible to keep a soup filled with a bowl at an appropriate temperature (50 to 60 ° C.) for 2 hours or longer by using the above. In addition, you can keep a proper temperature for a long time, such as liquor, gratin and clam butter baking.

FIG. 2 shows another embodiment of the present invention, in which the power receiving plug 13 is directly fixed to the heater H itself,
By embedding the outlet 14 in the plate surface of the table T, the cord is not laid around, the cord on the table does not get in the way, and the appearance is improved.

[0014]

As described above, the present invention has the following effects.

Since the PTC heating element can be held at a relatively low temperature, it is highly safe.

Since PTC has a temperature control function in the material itself, it is highly safe and does not require a thermostat or the like.

Since the battery usually has a low voltage of 50 V or less, the risk of electric shock is small. In particular, a 12V battery can be used without insulation.

Since there is no power cord, it does not get in the way and looks good.

The heat can be easily kept on the table and the food can always be eaten deliciously.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing another embodiment of the present invention.

[Explanation of symbols]

1 heating element, 2,3 metal electrode, 4 insulating plate, 5 heat insulating material, 6 heating plate, 7 bottom plate, 8 conducting wire, 9 socket, 10 battery, 11 cord, 12 plug,
13 plugs, 14 outlets

Claims (4)

[Claims] 1. A cordless heat retaining heater which uses a battery as a power source and a positive temperature characteristic thermistor as a heating element. 2. The cordless heat-retaining heater according to claim 1, wherein the battery is housed on the back side or under the dining table, or in an ornament on the dining table. 3. The cordless heat-retaining heater according to claim 2, wherein a plug for receiving electricity is provided on the heating element side, an outlet into which the plug is inserted is provided on a dining table, and a battery electrode is connected to the outlet. 4. The plug according to claim 3, wherein the plug is directly fixed to the heating element.
The cordless heat retention heater described.