JPH0132971Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention relates to an attachment structure for an inner pot detection switch of a rice cooker.

(Prior art) Generally, in a rice cooker, in order to prevent the rice cooking heater circuit from operating and damaging the machine if the inner pot is not inserted, the presence or absence of the inner pot is detected and the inner pot is inserted. The rice cooking heater circuit is energized only when the rice is cooked. Conventionally, a mechanical switch using a magnet was commonly used to detect the inner pot, but with the development of rice cookers using microcomputers, microswitches began to be used as the inner pot detection switch. Ta. For example, as shown in Figure 1 of Japanese Utility Model Application Publication No. 58-3155, a switch mounting base is fixed to the bottom of the outer container, a micro switch as an inner pot detection switch is attached to this, and its actuator is connected to the inner pot. It is activated by the vertical movement of a temperature sensor that detects the temperature at the bottom of the pot, turning on and off a micro switch.
A device in which the rice cooking heater circuit is turned on and off by this is put into practical use.

(Problem to be solved by the invention) However, in this type of rice cooker, when assembling the rice cooker, it is necessary to fix the switch mounting base to the bottom of the outer container in advance and attach the micro switch to this. Yes, and when attaching the bottom member with a built-in circuit board to the exterior body of the rice cooker, the lead wire connected to the contact terminal of the micro switch must be connected to the circuit board via a connector, which requires assembly. The work is complicated,
There was a problem of high manufacturing costs.

Therefore, an object of this invention is to provide an inner pot detection switch mounting structure that allows easy installation of the inner pot detection switch and reduces manufacturing costs.

(Means for Solving the Problems) In order to solve the above-mentioned problems, this invention has a temperature sensor that comes into contact with the bottom of the inner pot to detect the temperature at the bottom of the inner pot, which can be moved up and down the bottom wall of the outer pot. An inner pot detection switch is disposed on a circuit board built into the bottom member of the rice cooker, and an actuator of the inner pot detection switch is brought into engagement with the temperature sensor.

(Function) When the inner pot is placed in the outer pot, the bottom wall of the inner pot comes into contact with the temperature sensor, and its weight pushes down the temperature sensor, which pushes down the actuator that engages with the operating shaft of the temperature sensor. The inner pot detection switch is turned on and the rice cooking heater circuit is closed. On the other hand, when the inner pot is removed, the temperature sensor returns to its original position and the inner pot detection switch is turned off, so even if the rice cooking switch is accidentally pressed, the rice cooking heater circuit will not be turned on.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In the figure, 1 is an inner pot, 2 is an outer pot, 3 is a body exterior body, 4 is a lid hinged to the body body exterior body 3 by a hinge pin 9, and 5 is an inner lid detachably attached to the lid 4. , 6 and 7 are insulating materials, and when the push button 8 is pressed and the handle 4a of the lid 4 is lifted, the lid 4 rotates around the hinge pin 9 together with the inner lid 5 and opens.
Inner pot 1 is made removable.

The bottom member 11 includes a protection plate 12, a bottom plate 13, and a leg member 14, and a circuit board 15 including a power transformer T is disposed inside the bottom member 11. According to the present invention, the circuit board 15 is provided with an inner pot detection switch 16 consisting of a micro switch, and its contact terminals are connected directly or by lead wires to a rice cooking heater circuit formed on the circuit board 15.

Actuator 16a of inner pot detection switch 16
As shown in FIG.
8 is engaged. This inner pot detection switch 16
In order to prevent moisture adhering to the inner pot 1 from falling and getting the terminals etc. wet, the circuit board 15 is surrounded by a protective plate 12, and the actuator 16 is inserted through an opening 12a formed in the protective plate 12.
Only part a protrudes to the outside.

The temperature sensor 17 is vertically movable in a cylindrical housing 19 attached to the center of the bottom wall 2a of the outer pot 2, and is urged upward by a spring 20. Pressed downward. A rice cooking heater 2 is installed on the bottom wall 2a of the outer pot 2.
1 is disposed, and the head of a temperature sensor 17 protrudes into the outer pot 2 from a through hole formed in the center thereof, so that it can come into contact with the bottom 1a of the inner pot 1. In the figure, numeral 10 is a triax for turning on and off the rice cooking heater circuit and controlling the power supplied to the rice cooking heater, and 26 is a temperature sensor for detecting the side wall temperature of the inner pot 1.

In this embodiment, the circuit board 15 mainly constitutes a power supply circuit, and the control section for controlling rice cooking operations etc. is formed on the circuit board 24 disposed between the front panel 23 and the heat insulating material 6. However, the circuit board 24 may be configured integrally with the circuit board 15. With this configuration, problems such as short circuits of the circuit board 24 due to water entering between the front panel 23 and the trunk exterior body 3 and insulation deterioration due to dew condensation on the heat insulating material 6 do not occur.
In addition, in the illustrated embodiment, in order to solve the above problem, the front panel 23 on which the circuit board 24 is mounted is provided with a
The waterproof sheet 25 is made of synthetic resin or other insulating material and has a substantially F-shape, and includes an inclined part 25a that is inclined downward from the front panel 23 side to the insulating material side, and a vertical part 25b that extends downward from the inclined part 25a. It is installed.

When assembling the rice cooker having the above structure, the inner pot detection switch 16 is attached to the circuit board 15 together with the power transformer T, etc., and the circuit board 15 is attached to the protective plate 12 and built into the bottom member 11. If the actuator of the detection switch 16 is configured to protrude from the protection plate 12, it is sufficient to fix the bottom member 11 with the screws 30.

(Effects of the invention) As is clear from the above explanation, according to the invention, there is no need for a member for attaching the inner pot detection switch and a connector for connecting the inner pot detection switch and the circuit board, and moreover, Since there is no need to connect the connector to the circuit board during assembly, excellent effects can be obtained, such as simplifying the assembly process of the rice cooker and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of a rice cooker according to the present invention, and FIG. 2 is a cross-sectional side view of the main part thereof. 1... Inner pot, 2... Outer pot, 3... Body exterior body,
4... Lid, 5... Inner lid, 6, 7... Insulating material, 11
... bottom member, 12 ... protection plate, 13 ... bottom plate, 14 ... leg member, 15 ... circuit board,
16... Inner pot detection switch, 16a... Actuator, 17... Temperature sensor, 18... Action axis.

Claims (1)

[Scope of utility model registration request] A temperature sensor that comes into contact with the bottom of the inner pot to detect the temperature at the bottom of the inner pot is attached to the bottom wall of the outer pot so that it can move up and down, while an inner pot detection switch is arranged on a circuit board built into the bottom member. An inner pot detection switch mounting structure for a rice cooker, characterized in that the actuator of the inner pot detection switch is engaged with the temperature sensor.