JP2876282B2 - Safety device in case of abnormal overheating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for preventing an object to be heated such as a rice cooker or a cooking pot from being overheated.

[0002]

2. Description of the Related Art There is a rice cooker having a structure as shown in FIG. The upper end of the cylinder (2) is in contact with the bottom (11) of the rice cooker (1),
A soft ferrite (hereinafter, referred to as a “thermal element”) whose magnetic permeability changes with temperature is additionally provided to the lid (20) closing the upper end of the cylindrical body (2). An adsorbing member (30) formed of a permanent magnet is adsorbed on the lower side of the heat-sensitive element (21), and the adsorbing member (30) connects this to a swing lever (41) described later. It is fixed to the upper end of the connecting shaft (3). Arms (32) and (32) extending in the horizontal direction protrude from both sides of the suction member (30), and through holes (320) and (320) formed in the arms (32) and (32) are provided. Are separately extrapolated to the guide shafts (35) (35), whereby the posture of the connecting shaft (3) is properly maintained. Further, to the lower end of the connecting shaft (3), a tip of a swing lever (41) connected to the rice cooking operation lever (4) is connected.

A gas valve (51) as heating control means for opening and closing a gas circuit to a gas burner (5) is provided in the rice cooker main body, and a valve shaft (53) of the gas valve (51) is provided. Is the swing lever (4
One end of (1) is in contact with an upright portion (45) formed by bending upward. In this device, when the rice cooker operating lever (4) is pressed down, the gas valve (51) is opened against the urging force of the spring (52) and gas is supplied to the gas burner (5).
The gas burner (5) starts burning. Further, by operating the rice cooking operation lever (4), the swing lever (41) swings upward to lift the connecting shaft (3), and the suction member (30) arranged at the upper end thereof is connected to the heat-sensitive element (30). 21), and the rice cooking operation proceeds in this state.

[0004] When the rice cooker is in the cooked state and the temperature of the pot bottom (11) rises to the cooked temperature (normally 145 ° C), the magnetic permeability of the heat-sensitive element (21) in a heat conductive state decreases. The adsorbing force of the adsorbing member (30) on the heat-sensitive element (21) is weakened, and the adsorbing member (30) falls with the connecting shaft (3). Then, the connecting shaft
The swing lever (41) connected to the lower end of (3) also returns to the initial position and swings, and in conjunction with this, the gas valve (51) is pushed out by the urging force of the spring (52) to close the valve. Can be Thereby, the rice cooking operation is completed.

However, in the above-mentioned conventional apparatus, even if the rice cooking is completed, there is a risk that the adsorbing member (30) does not separate from the thermosensitive element (21) and the inside of the rice cooker (1) becomes overheated. For example, the through holes (320) (3) of the arms (32) (32) projecting from the side of the suction member (30)
20) and the guide shafts (35) and (35) inserted therethrough may not be able to slide smoothly due to aging dust adhesion. Then, the arms (32) and (32) may be caught on the guide shafts (35) and (35), and the connecting shaft (3) may not drop, and may be connected to the lower end of the connecting shaft (3). Swing lever (41)
The gas valve (51) that is linked to the rice cooker (1) is left in an open state, which causes the inside of the rice cooker (1) to be overheated.

Although the above problem has been described by exemplifying a rice cooker, a cooking pot having a built-in heating source has the same problem as described above. That is, if the gas burner (5) does not extinguish the fire even if the water in the cooking pot evaporates, there is a problem that the gas burner (5) falls into an abnormally overheated state. The present invention has been made in view of the above points, and has been made in consideration of "a heat-sensitive element that detects the temperature of a heated portion and the force to be absorbed decreases as the detected temperature increases, and an adsorption member that adsorbs to the heat-sensitive element. A connecting shaft (3) having one end fixed to the adsorbing member, and a swinging end connected to the other end of the connecting shaft (3) and the adsorbing member being in a state of being adsorbed to the thermosensitive element. A swing lever (41) swinging between a first lever position and a second lever position where the suction member is separated from the thermosensitive element; and the swing lever (41) is moved to the first lever position by a heating operation. In a state where the swing lever (41)
And a heating control device that stops the heating means when it has returned to the second lever position. The swing lever (41) is caused to swing to the second lever position by its own weight or the urging force of a spring. In which the urging force is applied], it is an object of the present invention to prevent an inconvenience in which a heated portion is in an abnormally overheated state. [Invention of Claim 1]

[0007]

[0008]

[0009]

[0010]

[0011]

The technical means of the present invention for solving the above-mentioned problem is as follows: "The end of the connecting shaft (3) and the swing lever (41) are connected by a connecting member made of a thermoplastic material. And a spring (43) for applying a biasing force to the swing lever (41) in a direction to separate the swing lever (41) from the end of the connecting shaft (3). "

[0012]

[Operation and effect] The following operation and effect can be obtained by the above technical means. When the portion to be heated falls into an abnormally overheated state, the thermoplastic coupling member that couples the end of the connecting shaft (3) and the swing lever (41) softens. Then, due to the urging force of the spring (43) acting on the swing lever (41), the softened connection member cannot hold the swing lever (43) and the connection shaft (3) in the connected state. ,
The swing lever (41) is separated from the connecting shaft (3) by the urging force of the spring (43). Thereafter, the heating operation of the heating means is stopped, and a safe state is ensured.

[0013]

Next, an embodiment of the present invention will be described. The rice cooker of the embodiment shown in FIG. 1 has a connecting shaft (3) and the connecting shaft.
Except for the structure of the connecting portion between (3) and the swing lever (41), the structure is substantially the same as the conventional one described above, and the same parts are denoted by the same reference numerals.

A tubular body (2) which comes into contact with the bottom (11) of the rice cooker (1).
Is covered with a lid (23) containing a thermosensitive element (21), and guide shafts (35) (35) hanging from the lower surface of the lid (23).
The cover (3) containing the attracting member (30) consisting of a permanent magnet
Arms (32) protruding horizontally from (1) (32) (32) through holes (320) (32
0) is extrapolated. Connecting shaft hanging from the cover (31)
(3) is constituted by a coupling member for connecting the upper shaft positioned vertically and (3a) the lower shaft and (3 _b) (36),該継hand member (3
6) is formed of a heat-meltable material. In this embodiment, the melting point of the hot-melt material is about 200 ° C. to 250 ° C.
Is adopted.

As shown in FIG. 2, the joint member (36) has a main body (360) and screw portions (361) protruding from both ends thereof.
(361), and the screw portion (361)
Screw holes (37) (37) are formed in the end surfaces of the upper and lower shafts (3a) and (3b) corresponding to (361). In the vicinity of the lower end of the connecting shaft (3), a resin flange (34) functioning as a connecting member according to the first aspect of the present invention and a metal flange (33) above the resin flange are mounted at intervals. (34) is made of a thermoplastic material and has a configuration in which a cut (340) in the radial direction is formed in a part of a ring-shaped flat plate as shown in FIG. Then, a shaft hole (34) formed at the center of the resin flange (34) is formed.
The inner diameter of 1) is set slightly smaller than the diameter of the connecting shaft (3), and the resin flange (34) is forcibly fitted to the annular groove (38) formed at the lower end of the connecting shaft (3). Then, this is assembled as shown in FIG. In this embodiment, as the thermoplastic material forming the resin flange (34), a material which has a softening point of 200 ° C. to 250 ° C. and melts at a predetermined temperature higher than this is employed.

A spring (43) is interposed between the swing lever (41) overlapping the resin flange (34) and the metal flange (33) located above the swing lever (41). ) Pushes the swing lever (41) downward. The spring (43) is provided because when the connecting shaft (3) becomes hot and the resin flange (34) starts to soften and melt as described later, the swing lever (4) is provided.
This is to ensure that 1) is separated from the connecting shaft (3). As shown in FIG. 5, the coupling shaft (3) is inserted into the engagement recess (411) cut and opened so as to open toward the tip of the swing lever (41). .

Further, a gas valve (51) is provided on an upright portion (45) which is bent and erected at one end of the swing lever (41) in the same manner as the conventional one.
(Corresponding to the heating control device described in the section of the technical means described above) corresponds to the valve shaft (53), and the gas valve (51) is provided with a spring (5).
It is urged in the valve closing direction in 2). Further, gas is supplied to a gas burner (5) as heating means via the gas valve (51).

In this apparatus, the rice cooker operating lever (4) is pressed down.
When this happens, the gas valve (51) is opened in conjunction with this
As the burner (5) starts burning, the swing lever (41)
The connecting shaft (3) is lifted by the upward swing and
The suction member (30) at the tip adsorbs to the thermosensitive element (21), and
The rice cooking operation proceeds in the same manner as the conventional one. Now, the connecting shaft
(3) The contact part (arm) between the side and the guide shaft (35) (35)
(32) Guide shaft (35) for through hole (320) (32) of (32) (35) (35)
Rice cooked due to garbage adhering to
If the connecting shaft (3) does not drop even when the
Since the closing operation of the valve (51) is not ensured, the rice cooker (1)
The temperature further rises above the rice cooking completion temperature (about 145 ° C). So
And the temperature is raised by heat conduction from the rice cooker (1).
The joint member (36) of the connecting shaft (3) and the lower end of the connecting shaft (3)
The heated resin flange (34) heats up to the melting point and softening point described above.
When the joint member (36) is melted, the resin
The flange (34) begins to soften, which causes the connecting shaft (3) to
Lower shaft (3 _b) The following parts may drop or swing
ー (41) is pushed down by the spring (43) and the resin flange (3
4) is broken and the swing lever (41) falls. Immediately
That is, the swing lever (41) returns to the initial position and swings.
You.

Then, the gas valve (51) is closed by the urging force of the spring (52) in conjunction with the return swing of the swing lever (41), whereby the gas burner (5) is set to the fire extinguishing state. The problem that the rice cooker (1) is maintained and abnormally overheated can be prevented.
In the above embodiment, a heat-fusible synthetic resin is used as the joint member (36) or the resin flange (34) provided at the center or lower end of the connection shaft (3). It goes without saying that it can be used.

In the above-described embodiment, the case where the present invention is applied to a rice cooker has been described as an example. You can also.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an arrangement portion of a joint member (36).

FIG. 3 is a detailed view of a connecting portion between the swing lever (41) and the connecting shaft (3).

FIG. 4 is an explanatory view of a resin flange (34).

FIG. 5 is a cross-sectional view of a connecting portion between the swing lever (41) and the connecting shaft (3).

FIG. 6 is an explanatory view of a conventional example.

[Explanation of symbols]

 (3) ・ ・ ・ Connection shaft (34) ・ ・ ・ Resin flange (41) ・ ・ ・ Swing lever (43) ・ ・ ・ Spring

Claims (1)

(57) [Claims] 1. A heat-sensitive element for detecting a temperature of a heated portion and having a lower force to be attracted as the detected temperature becomes higher, an adsorbing member for adsorbing to the heat-sensitive element, and one end fixed to the adsorbing member. The connecting shaft (3), a first lever position in which a swinging end is connected to the other end of the connecting shaft (3) and the suction member is sucked by the thermosensitive element, and the suction member are separated from the thermosensitive element. A swinging lever (41) swinging between a second lever position in a closed state, and a heating means in a heating state when the swinging lever (41) is set to the first lever position by a heating operation. A heating control device that stops the heating means when the swing lever (41) returns to the second lever position.
In 1), a biasing force for swinging to the second lever position is applied by its own weight or a biasing force of a spring, and the end of the connecting shaft (3) and the swinging lever (41) are joined by a thermoplastic material. Abnormal overheating provided with a spring (43) for applying to the swing lever (41) a biasing force in a direction for detaching the swing lever (41) from the end of the connection shaft (3) while being joined by members. Safety device when.