JPH048047B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an electric cooking appliance, such as a rice cooker, that has a safety switch mechanism that detects the presence or absence of a pot.

BACKGROUND ART Conventionally, a safety switch mechanism of this type of electric cooker has a structure as shown in, for example, Japanese Utility Model Application Publication No. 169214/1983.

That is, as shown in FIG.
The safety switch holder 2 is fixed to the main body with screws 3, and the safety switch 1 is connected to a lever 5 that is linked to a heat-sensitive device 4, and the movement of the lever 5 moves the electric contact portion.

Problems to be Solved by the Invention In such a conventional configuration, the safety switch holder 2 that fixes the safety switch 1 and the control circuit board that receives the electrical signal from the safety switch 1 and controls the power supply on and off are Electrical wires and accompanying screws, terminals, etc. were required.

The present invention solves these problems,
The purpose of this invention is to provide a safety switch mechanism that operates stably and has a simple configuration.

Means for Solving the Problem In order to solve this problem, the present invention provides a safety switch on the board in which the operating direction of the push button of the switch is parallel to the board, and a safety switch that transmits the movement of the thermal device to the push button of the switch. The lever is provided with a small protrusion on the surface that contacts the lever and the support column.

Function With this configuration, the safety switch mechanism eliminates the need for a safety switch holder for attaching the safety switch, electric wires for transmitting the electrical signals of the safety switch to the circuit board, accompanying screws, connection terminals, etc. It is possible to reduce the contact resistance of the lever and achieve stable operation.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

In the figure, 21 is a body, and this body 2
A protective frame 22 is installed inside the protective frame 21.
A through hole is provided in the center of the bottom. Protective frame 21
A heating element 23 having a heater 23a cast therein is fixed therein, and this heating element 23 also has a through hole in the center. A pot 24 is placed on the heating element 23.
It is designed to be able to be placed in a removable manner.

The heat sensitive device 25 is in close contact with the bottom of the pot 24 and
It senses the internal temperature, and there is an interlocking plate 2 at the bottom.
5a, and is housed in a heat-sensitive case 26 fixed to a through hole in the center of the heating element 23. A coil spring 27 is arranged between the heat-sensitive device 25 and the heat-sensitive case 26, and it lowers when the pot 24 is placed on the heating element 23 as shown in FIG. 2, and when the pot 24 is removed as shown in FIG. The heat sensitive device 25 is urged to move upward.

A lower frame 29 is fixed to the lower part of the body 21, and a board 28 is attached to the lower frame 29 by screws 28'.
It is stuck in place. This board 28 is equipped with a safety switch 30, and a push button 31 of the safety switch 30 is
is oriented horizontally and is biased by a coil spring 34, so that movement of the push button 31 moves the electrical contact portion.

The lower frame 29 has a column 33 shown in FIG. 5 projecting downward, and a lever 3 is attached to the column 33.
2 is rotatably attached to the rotary shaft portion 32a. More specifically, the support 33 has two corresponding support pieces 33a and 33b, and the lower end of one support piece 33a has a horizontal through hole 33c.
A receiving groove 33d is formed at the lower end of the other support piece 33b. Then, one end of the pivot shaft 32a extending horizontally in the lever 32 shown in FIG. 4 is inserted into the through hole 33c, and the other end is inserted into the receiving groove 33.
d is fitted. The support pieces 33a, 33b
A board cover 35 is disposed below the board cover 35, and one protrusion 35a of the board cover 35 allows the rotation shaft portion 3 to
2a from below, and the second projecting piece 35b restricts the lateral movement of the rotation shaft portion 32a.

Further, a small protrusion 32c is formed on the surface of the lever 32 facing the support piece 33a, thereby reducing the contact resistance between the side surface of the lever 32 and the support piece 33a. The tip 32b of the lever 32 contacts the interlocking plate 25a of the heat-sensitive device 25, rotates as the interlocking plate 25a moves, and the operating portion 32d of the lever 32 moves the push button 31 of the safety switch 30. .

Next, the operation of the configuration of this embodiment will be explained. When the pot 24 is not placed on the invention body 23 (FIG. 1), the heat sensitive device 25 is connected to the coil spring 27.
The lever 32, which is biased by and moved upward and comes into contact with the interlocking plate 25a, contacts the small protrusion 32c with the surface of the support piece 33a of the lever support column 33, and the tip 32b moves upward toward the rotation shaft 33a. The operating portion 32d presses the push button 31 of the safety switch 30, and the safety switch 30 is turned off.

Next, when the pot 24 is placed on the heating element 23, it moves below the heat sensitive device 25. The lever 32 is moved to the small protrusion 32 by the coil spring 34 of the safety switch 30.
c and the surface of the support piece 33a of the lever support pillar 33, the actuating part 32d is biased, and the rotation shaft part 3
It rotates clockwise around 3a, and the safety switch 30 is turned on.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, when the lever that presses the safety switch, which is parallel to the board, is rotated, the contact structure between the small protrusion provided on the lever and the support piece is used. By reducing the contact area and reducing rotational resistance, a stable and highly reliable safety switch mechanism can be provided.

[Brief explanation of drawings]

Figure 1 is an enlarged cross-sectional view of the main parts of the safety switch when the pot of the rice cooker is removed, Figure 2 is an enlarged cross-sectional view of the main parts of the safety switch when the pot is placed on the hot plate, and Figure 3 is an enlarged cross-sectional view of the main parts of the rice cooker. 4 is a perspective view of the lever, FIG. 5 is a perspective view of the support column, FIG. 6 is a perspective view of the lever in a supported state, FIG. 7 is a sectional view of the same, and FIG. 8 is a conventional safety switch mechanism. It is a sectional view of the pressure cooker provided. 24...pan, 25...thermal device, 30...safety switch, 32...lever, 32c...small protrusion.

Claims (1)

[Claims] 1. A pot placed on a heating element, a heat-sensitive device that moves up and down depending on the presence or absence of the pot and senses the temperature of the pot, and a lever that is linked to the movement of the heat-sensitive device.
A board is attached to the lower part of the heat-sensitive device and is equipped with electronic components for controlling cooking, and a push button is attached to the board so that the operation direction of the button is parallel to the board itself, and the lever is turned on and off by the rotational action of the lever.
What is claimed is: 1. An electric cooking appliance comprising: a safety switch that operates as a safety switch; and a support shaft that supports a rotating shaft of the lever, and a small protrusion is provided on a side surface of the lever that contacts the support shaft when the lever rotates.