JPS6231054Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a heat-responsive switch for use in cooking appliances and the like.

In conventional cookers, the temperature of the container is sensed by a thermosensor that is elastically supported by a spring and tightly attached to the container, and the power circuit switch is opened/closed via a lever linked to the thermosensor. has been done.

In such cookers, if you turn on the switch without storing a container, the sensitivity of the temperature sensor will drop, so even if the cooker reaches an abnormal temperature, the temperature sensor will not operate and the hot plate of the electric circuit will not be energized. If left in place, there is a risk of damage to the equipment or an accident such as a fire.

This invention is designed to prevent the above-mentioned conventional accidents from occurring through simple improvements.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 1, the inner container 13 is placed on a heating plate 3 attached to a receiving plate 2 provided in the container body 1, and a temperature sensor 4 is mounted in the center of the heating plate 3 via a spring 5. The container 1 is elastically supported by the support portion 2a of the receiving plate 2.
It is attached to the bottom of 3.

The temperature sensor 4 is composed of a ferrite 6 attached to a case 4a and a permanent magnet 7 supported movably up and down via a coil spring 8, and is configured to thermally respond to a constant temperature.

The permanent magnet 7 is connected via a rod 14 to a lever 9 that rotates about a fulcrum 10, and the tip of the lever 9 is provided to turn a switch 11 on and off. 12 is an elastic body, lever 9
A rod 1 is inserted between the support part 2a provided on a part of the receiving plate 2
It is telescopically attached through 4. In addition, the amount of deflection δ of the elastic body 12 is calculated by subtracting the clearance h between the support portion 2a and the elastic body 12 in the rice cooking state from the stroke A of the temperature sensor 4, and the load at that time is ferrite. It is set so as to exceed the attraction force between the permanent magnet 6 and the permanent magnet 7.

The operation of the thermally responsive switch constructed as in this embodiment will be explained.

When the container 13 is placed on the hot plate 3, the temperature sensor 4 is pressed against the bottom of the inner container 13 as shown in FIG. When the permanent magnet 7 is rotated, the permanent magnet 7 is attracted to the ferrite 6, so that the rod 14 is held in the raised position and the switch 11 is turned on.

On the other hand, when the inner container 13 is not placed on the hot plate 3, the temperature sensor 4 is raised by the spring 5 by a height A above the surface of the hot plate 3, as shown in FIG. Retained. At this time, the elastic body 12 is δ
Just deflect. Since the load on the elastic body 12 at this time is greater than the attraction force between the ferrite 6 and the permanent magnet 7, the attraction is released, the lever 9 is rotated clockwise, and the switch 11 is turned off.

Furthermore, if the inner container 13 is not present, even if you try to force the switch 11 on without noticing it, the lever 9 will become heavier due to the elastic body 12, and then the ferrite 6 and the permanent magnet 7 will attract each other, so the inner container 13 will not open. There is no need to forcefully press the lever 9 and deform it.

As explained above, in this invention, an elastic body is inserted between the support part of the thermosensor and the lever, and the closed circuit is configured to be opened by the elastic body when the thermosensor floats higher than the hot plate. Therefore, it is possible to prevent the inner container from being energized when it is not placed on the hot plate, and to prevent accidents due to abnormal heating from occurring.

[Brief explanation of the drawing]

Fig. 1 is a structural sectional view showing one embodiment of the thermally responsive switch of the present invention, Figs. 2 and 3 are enlarged sectional views of the main parts thereof, and Fig. 2 shows the structure when the inner container is stored. FIG. 3 is an explanatory diagram showing each operating state when the inner container is not housed. 2... Receiving plate, 4... Temperature sensor, 6... Ferrite, 7... Permanent magnet, 9... Lever, 12... Elastic body.

Claims (1)

[Scope of utility model registration request] In a heat-responsive switch for a cooking appliance in which the switch is opened and closed via a lever linked to an elastically supported thermosensor, an elastic body 12 is interposed between the receiving plate 2 and the lever 9, and the thermosensor Thermal response opening/closing of a cooking appliance characterized in that the load corresponding to the amount of deflection of the elastic body 12 when the appliance 4 is in a free state is greater than the adhesion force between the ferrite 6 and the permanent magnet 7 in the temperature sensor 4. vessel.