JPH0157570B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to cooking utensils used in general households.

BACKGROUND OF THE INVENTION In recent years, many of this type of cooking utensils have come to be equipped with automatic control programs using microcomputers.

Hereinafter, such a cooking device will be explained using FIG. 4. 1 is a printed circuit board housed in a display board 2 on the outer periphery of the main body 3. The main body 3 has a double structure, and a bottomed cylindrical protective frame 5 is provided inside the cylindrical body 4. There is. Both the body 4 and the protective frame 5 are made of metal, and the annular upper frame 6 that connects them at the upper part has a hinge part 6a that supports the outer cover 7 that covers the upper part of the main body 3, and a locking part when the outer cover 7 is closed. Since the hook part 6b, the soup holder holding part 6c, etc. must be provided integrally, resin is used because it has a high degree of structural freedom.

Furthermore, the lower frame 8 constituting the lower part of the main body 3 below the body 4 accommodates the printed circuit board 1a, so it has a high degree of structural freedom and can easily maintain electrical insulation from the printed circuit board 1a. Generally, resin is used, and the back plate 9 constituting the bottom of the main body 3 is made of metal.

Problems to be Solved by the Invention In such a conventional configuration, since the annular upper frame 6 and the lower frame 8 are made of resin, the body 4 and the protective frame 5
and the back plate 9 are electrically insulated from each other.
This has caused the following problems.

The first problem is that the cooking utensil is operated by a person, and static electricity generated in the human body is applied to the metal parts of the cooking utensil body 4, protective frame 5, and back plate 9. When testing equipment protection from static electricity, if static electricity is applied to the protective frame 5, it will tend to flow from the protective frame to other conductors, but it will not flow from the protective frame 5, which is electrically insulated. There is no place for it to flow, and the static electricity that shows a very high voltage value will fly to the conductive part near the protective frame 5 as an electric discharge in the air due to an arc.
There are lead wires for various wiring inside, and if an arc strikes these, high voltage will be loaded onto the circuit, which will destroy the microcomputer on the printed circuit board and cause abnormal control functions. This causes abnormalities such as cooking abnormalities and continuous power supply to the heater.

The second problem is that it is legally required to conduct an insulation performance test between the power supply wire and the non-carrying metal parts of each part. The back plate 9 is electrically insulated, and it is necessary to test each one, which takes a lot of man-hours, and in terms of dielectric strength, high voltage is applied, which increases the risk. It was becoming.

In view of the above problems, the present invention eliminates the destruction of microcomputers and the like due to static electricity, and also reduces the number of man-hours required for insulation performance testing.

Means for Solving the Problems In order to solve the problems, the present invention provides a cylindrical body made of a thin metal plate, a lower frame made of resin that fits into the lower part of the cylindrical body, and a lower frame that is made of resin and forms an outer shell. a metal protective frame provided therein, and a resin annular upper frame that connects the body and the protective frame at the top;
It has a metal back surface that covers the bottom opening in the lower frame, and the body and the protective frame are short-circuited, and the protective frame and the back plate are short-circuited by metal fittings.

Function With this configuration, the body and the protective frame, and the protective frame and the back plate are electrically connected to each other, so when performing static electricity tests on each part, the static electricity applied to each part of the outer shell with the body as the ground electrode is Since all metal parts are electrically conductive, there is no possibility of air discharge and arc flying into the wiring inside the main body, and the arc is guided to the body and grounded. Therefore, the microcomputer etc. on the printed circuit board can be protected from destruction due to high voltage caused by static electricity.

Furthermore, when conducting an insulation performance test or dielectric strength test between the outer non-conductive metal parts of each part, only the back plate needs to be tested, which can halve the number of testing steps and dangerous work involving high voltage.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 11 is a cylindrical body made by bending a thin metal plate constituting the outer part of the main body 10 and having both end surfaces curled inward.
Reference numeral 2 denotes a bottomed cylindrical protective frame formed by drawing a thin metal plate forming the inside of the double structure of the main body 10, 13 a resin annular upper frame that connects the upper part of the body 11 and the protective frame 12, and 14 a resin-made annular upper frame. A cast-in heater placed at the inner bottom of the protective frame 12; 15 a bottomed cylindrical pot that is housed inside the protective frame 12 for storing food to be cooked; Lid, 17
Reference numeral 18 indicates a resin lower frame that constitutes the lower end of the outer shell of the main body 10 and has legs on the lower outer periphery and an opening at the bottom; 18 indicates a back plate made of a thin metal plate that is attached to the bottom opening of the lower frame 17; and 19 indicates a lower frame made of resin. A metal fitting A attached to the annular upper frame 13, which is a protruding piece with a swivel 20 extending from the fitting seat surface 13a of the body 11 and the mounting surface 13b of the protective frame 12 toward the curling part of the body 11 and the protective frame 12. 19a is provided, and upon assembly, the body 11 and the protective frame 12 are electrically connected through the metal fitting A19.

Reference numeral 21 denotes a metal fitting B attached downward to the bottom of the protective frame 12, which reaches below the mounting surface 18a of the back plate 18 in its free form, and comes into contact with the swivel 22 when the back plate 18 is attached.
The protective frame 12 and the back plate 18 are electrically connected through the metal fitting B.

With the above configuration, the body 4, the protective frame 5, and the back plate 9
By being electrically conductive, static electricity is grounded through the body 4, and static electricity applied from the outside does not become high voltage and destroy the microcomputer or the like.

Further, when performing an insulation performance test, since each conductive part is electrically connected, only one place needs to be tested, which greatly reduces the number of man-hours.

Effects of the Invention As described above, according to the present invention, even if a top frame and a bottom frame made of non-electrically conductive materials are used in a double-structured main body, the body, protective frame, and
The back plates can be electrically connected to each other, and as a result, static electricity applied to the outer part of the product can prevent the microcomputer on the board from being destroyed and causing malfunctions and abnormal operations.
This not only ensures product protection and improves reliability, but also reduces man-hours, increases productivity, and simplifies production equipment and reduces risks in insulation performance tests and dielectric strength tests. It will be done.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view of a cooking utensil according to an embodiment of the present invention, FIGS. 2 and 3 are partial perspective views of the cooking utensil, and FIG. 4 is a partial sectional view of a conventional cooking utensil. 10... Main body, 11... Body, 12... Protective frame, 13... Annular upper frame, 17... Lower frame, 18...
Back plate, 19...Metal fitting A, 21...Metal fitting B.

Claims (1)

[Claims] 1. A cylindrical body made of a thin metal plate, a lower frame made of resin that forms an outer shell that fits into the lower part of the body, a metal protective frame provided inside the body, and a metal protective frame that connects the body and protective frame to the upper part. an annular upper frame made of resin that is joined by a ring, and a back plate made of metal that covers a bottom opening in the lower frame, and metal fittings that short-circuit the body and the protective frame, and the protective frame and the back plate, respectively. kitchenware.