JPH0316529A - Safety device for heating cooker - Google Patents

Abstract

PURPOSE:To improve combining workability by connecting a temperature detector and a micro switch to each other with a lever spring having springing property, and by making the spring section of the lever spring abut against a substrate case, and the temperature detector abut against the lever spring. CONSTITUTION:By a heater 23, heat is fed to an internal pot 21 for containing an object to be cooked. To the internal pot 21, a temperature detector 25 is made to abut against an energizing spring 27. Besides, by a control substrate 26, the electrification of the heater 23 is controlled, and a micro switch 32 for forcibly cancelling the electrification of the heater 23 is set. On a substrate case 29 for containing the control substrate 26, a lever spring 34 is rotatably fitted. Besides, at the one end of the lever spring 34, a pressing section 35 made to abut extensively against the bottom section of the temperature detector 25 is formed, and at the other end, a spring section 37 made to abut against the substrate case 29, and a working section 38 for working the push button 40 of the micro switch 32 are formed, and the device 25 and the switch 32 are connected to each other. As a result, combining workability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a safety device for a heating cooker equipped with an inner pot, such as an electric jar rice cooker, which prevents abnormal energization such as energization without the inner pot. It is something.

2. Description of the Related Art In recent years, heating cookers such as electric jar rice cookers whose heating devices are controlled by microcomputers have become popular.

Conventionally, this type of safety device generally had a configuration as shown in FIG. The structure will be explained below with reference to the diagram. In FIG. 3, a temperature detection device 4 containing a temperature sensor 3 for detecting the temperature of the inner pot 1 is installed approximately in the center of the casting heater 2 that supplies heat to the bottom surface of the inner pot 1. This temperature detection device 4 is a cast-in heater 2
The energization of the casting heater 2 is controlled by sending a signal to the circuit board 5 disposed below.

The temperature detection device 4 is constantly urged upward by a biasing spring 6, and is provided with a sliding plate 7 at the bottom.

The circuit board 5 is housed in a board case 8, and is provided with a microswitch 9 for forcibly de-energizing the casting heater 2.

A switch lever 10 is rotatably mounted on the board case 8.
is attached, and one end of this switch lever 10 is
It is inserted into a square hole (not shown) in the sliding plate 7 of the temperature detection device 4, and the other end is in contact with the push button portion of the microswitch 9.

In the above configuration, when the inner pot 1 is attached, the temperature detection device 4 is pushed down while being urged by the bottom surface of the inner pot 1, and the sliding plate 7 is also lowered. At this time, the switch lever 10 inserted into the square hole of the sliding plate 7 rotates around the part where it is attached to the board case 8, and releases the pressure on the push button part of the micro switch 9 at the other end. Operate the micro switch 9,
The attachment of the inner pot 1 is recognized on the circuit.

Problems to be Solved by the Invention In such a conventional configuration, the switch lever 1o is generally made of resin or the like and is a substantially rigid body, so the sliding of the temperature sensing device 4 is difficult. It was necessary to increase the moving distance. In other words, in order to prevent the operation of the microswitch 9 from becoming uncertain due to dimensional variations after assembly, and to prevent damage to the circuit board 5 due to an abnormal load on the microswitch 9, the push button of the microswitch 9 is It was necessary to increase the operating stroke of the temperature sensing device 4, and accordingly, the sliding distance of the temperature sensing device 4 had to be increased.

Furthermore, this also increases the size of the microswitch 9, the space for the circuit board 6, and the sliding space for the temperature detection device 4.

1. The switch lever 10 controls the vertical sliding of the temperature detection device 4.
In order to change to rotational operation, the dimensional relationship between the square hole of the sliding plate 7 and the switcher lever 10 needs to have some play
There was a risk that foreign objects such as rice grains could get stuck in the gaps caused by this backlash, making the operation of the microswitch 9 uncertain.

Furthermore, as mentioned above, since the switch lever 10id is in contact with the sliding plate 7 of the temperature detecting device 4, which is generally heated to a high temperature, a certain shaped product such as the joint resin, for example, the casting heater 2 and the inner pot 1, When electricity is turned on, such as when a foreign object such as rice grains is caught between the 1 and 1, the temperature of the cast-in heater 2 rises rapidly, and the sliding plate 7 also becomes quite hot, causing the switch lever 1 to
There was a risk that the microswitch 9 would not operate properly due to thermal deformation or thermal deterioration of the microswitch 9.

1. Insert the switch lever 10 into the square hole of the sliding plate 7,
Furthermore, it had to be attached to the board case 8, making assembly very difficult.

The present invention solves the above-mentioned problems, and aims to provide a safety device for a heating cooker that has good assembly workability, is simple, requires less work, and has improved reliability.

Means for Solving the Problems In order to achieve the above object, the present invention provides an inner pot, a heating device for supplying heat to the inner pot, a temperature detection device that abuts the inner pot by a biasing spring, and a heating device for supplying heat to the inner pot. A control board equipped with a microswitch that controls the energization of the heating device and forcibly releases the energization of the heating device, a board case that houses the control board, and a Leper spring that is rotatably attached to the board case. one end of the lever spring forms a suppressing part that extends and contacts the bottom of the temperature sensing device, and the other end has a spring part that contacts the board case and operates a push button of the microswitch. The temperature sensing device and the microsinch are connected to each other by forming an operating section.

Function: Based on the above-mentioned structure, the present invention connects a temperature detection device and a microswitch using a lever spring having spring properties, and also constantly monitors the temperature by bringing the spring part of the lever spring into contact with the circuit board case. Since the detection device and the lever spring are still in contact with each other, it is easy to absorb dimensional variations after assembly, the stroke of the push button of the microswitch can be minimized, and the intrusion of foreign matter can also be prevented. Therefore, the sliding distance of the temperature detection device due to the attachment of the inner pot can also be reduced.

In addition, the Lepper spring is made of metal and has strong heat resistance, and is easy to assemble by simply bringing it into contact with the temperature detection device.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

As shown in the figure, a cast-in heater 23 made of Anoremi and having a sheathed heater 22 embedded therein is disposed at the bottom of the inner pot 21 which is drawn using an anoleminium plate or the like, and supplies heat to the inner pot 21. A temperature detection device 25 equipped with a temperature sensor 24 inside is installed approximately in the center of the cast-in heater 23, and sends a signal to a control board 26 disposed below the cast-in heater 23 to turn on electricity to the cast-in heater 23. It's in control. The temperature detection device 26 is constantly urged upward by a biasing spring 27, and is provided with a sliding plate 28 having a substantially L-shaped lower portion at its bottom.

The control board 26 is a board case 72 made of resin.
The substrate case 29 is attached to a frame 30 made of sheet metal or the like, and attached to a heat shield plate 31 disposed below the cast-in heater 23. Furthermore, the control board 26 is equipped with a microswitch 32 that forcibly de-energizes the casting heater 23.

A lever spring 34 bent from a spring material is rotatably attached to the rotating shaft 33 & of the tip protrusion 33 of the board case 29, and one end of the lever spring 34 is connected to the temperature detecting device. 26 to form a pressing portion 36, which contacts the L-shaped bent portion of the sliding plate 28 via a lip pressing portion 36- provided on the pressing portion 35. lever spring 3
The other end of 4 has a spring part 37 and an operating part 38, and
The spring portion 37 is biased against the front wall portion 39 of the board case 29,
This repulsive force causes the suppressing portion 36 to constantly press against the sliding plate 28. The operating section 38 extends to the push button section 40 of the microswitch 32 and operates the push button section 40.

To explain the operation of the above structure, when the inner pot 21 is loaded, the bottom part comes into contact with the casting heater 23, but the temperature sensing device 26, which was protruding beyond the casting heater 23, is pushed down into the inner pot 21.

At this time, the temperature detection device 26 is activated by the biasing spring 27 so that the inner pot 2
It descends in close contact with the bottom part of 1. Temperature detection device 2
5, the sliding plate 28 descends and pushes down the pressing part 36 of the lever spring 34, but the pressing part 36 is pressed against the sliding plate 28 by the pressing of the spring part 37 against the front wall part 39 of the board case 29. Since they are in constant contact, this operation is reliably performed in conjunction with each other. Since the lever spring 34 is rotatably attached to the circuit board case 29, the downward sliding movement of the pressing part 35 is converted into the upward sliding movement of the operating part 38 with the rotating shaft 33a as the center of rotation. By operating the push button portion 40 of the microswitch 37, attachment of the inner pot 21 is detected, and the casting heater 23 can be energized.

As described above, according to the safety device of the heating cooker according to the embodiment of the present invention, the lever spring 34 is formed using a spring material, and the spring part 37 is pressed against the board case 29, so that the pressing part 35 is biased against the sliding plate 28, it is easy to absorb dimensional variations after assembly, and no excessive load is applied to the control board 26.
The zero operation stroke can also be minimized, and the intrusion of foreign matter can also be prevented. Therefore, the sliding distance of the temperature detection device 25 due to the attachment of the inner pot 21 can also be reduced, resulting in space savings.

In addition, the Leper spring 34 is made of metal and has good heat resistance and durability.Furthermore, since it is simply brought into contact with the temperature detection device 26, it is easy to assemble.

In addition, in this example, the heating device is cast heater 2.
3, but it is not particularly limited, and it is clear that similar effects can be produced by electromagnetic induction heating, etc.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the operations of the temperature detection device and the microswitch are connected by a Leper spring having spring properties, and the spring portion of the lever spring is urged against the board case. As a result, the lever spring's suppressing part and the temperature sensing device are constantly in contact with each other, so dimensional variations can be absorbed without applying overload to the control board, and the stroke of the push button of a micro switch or the sliding of the temperature sensing device can be absorbed. It is possible to provide a safety device for a heating cooker that can reduce the dynamic stroke, has a small base, has good heat resistance and durability, has a simple structure, is easy to assemble, and can operate reliably.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing the internal structure of a safety device for a heating cooker according to an embodiment of the present invention, Fig. 2 is a plan view of the same, and Fig.
The figure is a longitudinal sectional view showing the internal configuration of a safety device of a conventional heating cooker. 21... Inner pot, 23... Casting heater (heating device), 26... Temperature detection device, 26
...Control board, 27...Biasing spring, 2
9... Board case, 32... Micro switch, 34... Lever spring, 36...
...Press section, 37...Spring section, 38...
- Operating section, 40...Push button section.

Claims (1)

[Claims] an inner pot for storing food to be cooked; a heating device for supplying heat to the inner pot; a temperature detection device abutting the inner pot by a biasing spring; and controlling energization of the heating device; a control board equipped with a micro switch for forcibly releasing the control board, a board case housing the control board, and a lever spring rotatably attached to the board case, one end of the lever spring being connected to the temperature sensing device. A pressing part that extends and contacts the bottom of the microswitch is formed, and a spring part that contacts the board case and an operating part that operates the push button of the microswitch are formed at the other end of the temperature sensing device and the microswitch. A safety device for a heating cooker that connects the