JPS6153045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric pot that heats and cooks food by placing the pot body on a cooking heater.

To control the temperature of a cooking heater, the set temperature must be stabilized in order for the cooking to be carried out successfully. Conventionally, heat-sensitive switches such as bimetals have been used to control temperature changes between the lower and upper temperature limits of the heater. It takes a long time for the heater to turn on and off, and one cycle of turning the heater on and off also becomes longer. For this reason,
The actual cooking temperature transferred to the pot body also changes in much the same way and affects cooking. This is also the reason why electric pots are not particularly suitable for extremely short cooking times.

In order to solve the above-mentioned problems, this invention provides a cooking heater at the bottom of the case body, receives a pot body fitted through the opening of the case body, and uses an electric power source to heat the pot body with the cooking heater. In a pot, a switch unit that integrally incorporates a control heater for temperature adjustment, a control heat-sensitive switch and a power switch that senses only the temperature of this control heater and turns on and off the cooking heater and the control heater at the same time is used. The present invention is characterized in that one operation section is attached to the back surface of the case body and faces the outside of the case body for operating the control heat-sensitive switch and the power switch, respectively.

With this configuration, the cooking heater can be turned on and off in very short cycles together with the control heater by a control heat-sensitive switch that receives a simulated temperature given by an extremely small-capacity control heater, regardless of the intended use of the appliance, that is, cooking. be done. In addition, the control heater and control heat-sensitive switch form an integrated switch unit and are installed on the back of the main body case, allowing cooking to be performed as set by the control heater alone, without being affected by the outside temperature or the heat of the cooking heater. Temperature can be controlled. moreover,
A power switch separate from the control heat-sensitive switch is provided to reliably prevent the risk of electricity being turned on when not in use with the cord connected to the power supply, and the power switch is built into the switch unit and is located outside the case body. , can be operated by a single operating section that can also operate a control heat-sensitive switch.

Furthermore, in order to ensure safety in the unlikely event of cooking in the invention, it is also an advantage that the invention is further provided with a control heat-sensitive switch that senses the temperature of the cooking heater and controls it at the limit temperature. It is a feature.

Due to this configuration, when the temperature control by the switch unit is unable to cope with the actual cooking temperature and therefore the abnormal cooking temperature that may actually occur, the additional control thermosensitive switch responds to Safety is ensured by turning off the heater.

To explain the embodiment, 1 is the case body;
Reference numeral 2 denotes a metal heating plate incorporating a cooking heater 3, and 4 a pot body placed on the heating plate 2 and receiving heat from the heater 3. The case body 1 has a container shape, and a heat reflecting wall 5 having a recess 5a in which the heating plate 2 and the pot body 4 can be fitted is fitted into the opening 1a of the case body 1, and the heating plate 2 is attached to the bottom of the heat reflecting wall 5. The pot body 4 fitted into the same wall 5 is attached so as to be able to be received thereon. Reference numeral 6 denotes a fastening piece that serves both the bottom of the heat reflecting wall 5 and the heating plate 2, and one end is attached to the bottom of the case body 1 by screws 7 to the legs 8.
The other end is fixed to the heat reflecting wall 5 with a screw 9.
They are fixed to the bottom and the heating plate 2, and are also used to attach the heating plate 2 to the bottom of the heat reflecting wall 5, and are provided at several locations around the circumference. The switch unit 10
As shown in the figure, an extremely small capacity control heater 11 for temperature adjustment and a bimetal switch S1 that senses the temperature and turns on and off the heater 11 and the heater to be controlled are connected to main switches S _{M and} It is housed in one box 12 together with the pilot lamp switch _S2 , and is arranged in a cavity 13 surrounded by the main body 1 and the heat reflecting wall 5 in the case main body 1.

The box 12 includes a window 1 in which a front portion on which an operation knob 14 is provided is provided on a part of the side circumferential surface of the case body 1.
It is covered by a cover 16 that faces outside from b and forms an operation surface 15. Operation knob 14
is located on the front side of the operation surface 15 and is attached to the protruding end of the operation shaft 17 that protrudes from the box 12. The operating shaft 17 is supported by a bearing on the box 12, and pushes and operates a movable contact piece 18 on the inside of the box 12.
A first cam 21 that simultaneously contacts and releases the fixed contact pieces 19 and 20, and a second cam 22 that activates and deactivates the switch _S1 are integrally formed. The contact piece 18 and the contact piece 19 form the main switch S _M , and the contact piece 20 forms the pilot lamp switch S ₂ .

In the bimetal switch S ₁ , the tip of the movable contact piece 23 engages the bending portion 23 a to the tip of the support lever 27 which is pivotally connected to the insulating plate 25 around which the control heater 11 is wrapped around a shaft 26 . A bimetal 28 that senses the temperature of the heater 11 is attached to the tip of the insulating plate 25, and its tip is inserted into the tip passive window 27a of the lever 27. The insulating plate 25 is provided with an elastic tail piece 29, the main body is parallel to the elastic tail piece 29, and the tip is elastically pressed against the second cam 22 so as to be operated by the second cam 22. An operating piece 30 is provided, and the tail piece 29 is brought into elastic pressure contact with the operating piece 30 so that the tail piece 29 follows the operating piece 30. 31
is a screw that finely adjusts the distance between the tail piece 29 and the operation piece 30, and is screwed onto the operation piece 30 and the tail piece 2
It acts to push 9 away. In addition, bimetal 2
The tip of the lever 8 protruding from the passive window 27a engages in the window 12a formed in the side wall of the box 12 to regulate the maximum retraction position of the movable piece 23, and the fixed contact piece of the movable piece 23 A permanent magnet 32 that attracts and maintains a state in which it is in contact with the box 24 is fixedly installed within the box 12. On the other hand, when the cooking heater 3 reaches its limit temperature, the switch unit 1
0, a safety bimetal switch 33 that acts on the cooking heater 3 is directly attached to the bottom surface of the heating plate 2 with screws 34. 37 is a fine adjustment screw.

The pot body 4 has a lid 38, the pot body 4 and the heating plate 2 are sized to form a gap 35 with respect to the side peripheral wall of the heat reflecting wall 5, and the opening edge flange portion 4a of the pot body 4 The heat reflecting wall 5 and the shoulder portion 36 to which the case body 1 is fitted are covered with a gap 35,
This gap 35 is intended to reduce the heat from the pot body 4 and heating plate 2 from reaching the heat reflecting wall 5. Also,
Since the flange portion 4a covers the shoulder portion 36, even if the gap 35 is present, spilled juice or the like is prevented from infiltrating into the recess 5a of the heat reflecting wall 5.

This invention has the above-described configuration, and when the shaft 17 is rotated clockwise in FIG.
It is pushed out from 1a and pressed against the fixed contact pieces 19 and 20, and the main switch S _M and the pilot lamp switch S ₂ are turned on. On the other hand, at the same time, the operation piece 30 also rides on the maximum protrusion 22b from the recess 22a of the second cam 22 and is pushed back to the maximum, thereby relaxing the pushing force of the support lever 27 against the tail piece 29. As a result, the tail piece 29 acts on the support lever 27 via the insulating plate 25 and the bimetal 28. The separation force of the movable contact piece 23 against the fixed contact piece 24 is minimized. For this reason, the support lever 27
is attracted by the magnet 32, presses the movable contact piece 23 against the fixed contact piece 24, and turns on the switch _S1 .

When both switches S _M and S ₁ are turned on, the cooking heater 3 is turned on, and when switch S ₁ is turned on, the control heater 11 is turned on. Therefore, heating of the pot body 4 starts and cooking begins. When the shaft 17 is further rotated, the pushing position of the second cam 22 with respect to the operating piece 30 changes from the maximum protruding portion 22b to the minimum protruding portion 22a side, and the amount of pushing back with respect to the operating piece 30 is gradually reduced. . Movable contact piece 18 between
remain equally pushed by the perfect circular circumferential surface 21b of the first cam 21, and the switches S _M and S ₂ remain in the ON state stably. As a result, when the push-back amount of the operation piece 30 is adjusted by rotating the shaft 17, the operation piece 30 of the movable contact piece 23 moves the tail piece 29
Only the separation force applied to the fixed contact piece 24 is adjusted.

By turning on the cooking heater 3, the pot body 4
The temperature rises, and by turning on the control heater 11, the bimetal 28 is heated. The bimetal 28 is a small piece that responsively senses the rapid temperature rise of the small-capacity control heater 11 and immediately operates to pull the support lever 27 away from the magnet 32, causing the operation piece 30 whose position has been adjusted to The movable contact piece 23 is separated from the fixed contact piece 24 by a distance corresponding to the position of the tail piece 29, which is thus regulated, and the switch _S1 is turned off. As a result, each heater 3, 11 is turned off. Since the control heater 11 has a small capacity, the temperature drops quickly, and the bimetal 28 also
In response to this, the movable contact piece 23 is moved toward the fixed contact piece 24 via the support lever 27. When the movable contact piece 23 moves within the attraction range of the magnet 32, it is attracted and comes into contact with the fixed contact piece 24, turning on the switch _S1 . Therefore, heaters 3 and 1
1 is turned on again and the heater 3 heats the pot body 4 again. Thereafter, the same operation is repeated to proceed with cooking.

As is clear from the above, switch unit 10
By using the control heater 11 and the bimetal 28, the built-in switch _S1 is turned on and off in an extremely short time compared to the conventional method, and the cooking heater 3
The temperature of the heating plate 2 and the pot body 4 heated via it is made more constant. Then, it is set by adjusting the position of the operation piece 30. The separation distance of the movable contact piece 23 from the fixed contact piece 24 is determined by increasing the temperature of the control heater 11.
The adjustment by turning the knob 14 is related to the time required for the bimetal 28 to attract the movable contact piece 23 to the magnet 32 and bring it into contact with the fixed contact piece 24.
This is to adjust the off time in one cycle operation of _S1 , and as a result, the energization time to the cooking heater 3 changes to adjust the temperature. Although the change in the separation force of the movable contact piece 23 against the fixed contact piece 24 through adjustment by the knob 14 also plays a role in temperature regulation, it actually has little effect on the separation timing of the movable contact piece.

The switch 33 is activated when the cooking heater 3 reaches a limit temperature for some reason, for example, to cut off the electricity and ensure its safety.

Since the heat reflecting wall 5 reflects the heat of the cooking heater 3 and the pot body 4 to suppress the heat influence on the empty chamber 13, the bimetal switch S ₁ in the switch unit 10 controls the small capacity control heater 11. In addition to sensing only the temperature and accurately controlling the cooking heater 3, the cooking heater 3 can be locally installed using radiant heat in the gap 35 caused by heat reflection from the heat reflecting wall 5. 4. Heat evenly throughout and avoid local overheating during cooking.

According to this invention, since the cooking heater is turned on and off together with the control heater by the control heat-sensitive switch that senses the simulated temperature by the control heater with an extremely small capacity unrelated to the control heater, the on/off cycle is short and precise. It allows precise temperature control and is suitable for short-time cooking. In addition, the control heater, control heat-sensitive switch, and power switch form an integrated switch unit and are installed on the back of the main body case, making them less susceptible to the effects of outside temperature or the heat of the cooking heater. The cooking temperature can be controlled as desired, and the power can be turned on and off by a power switch that operates independently from the control heat-sensitive switch, and the respective operations of the control heat-sensitive switch and the power switch are This is convenient because it can be done with a single operating section facing the outside of the case body, and since only one operating section is required, it is easy to operate and has a good appearance. Furthermore, in another aspect of the invention, even if the temperature reaches a limit for some reason, safety can be ensured by a safety heat-sensitive switch that operates at the same limit temperature and controls the cooking heater.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment, and FIG. 2 is a front view showing the internal structure of the switch unit. 1... Case body, 2... Heat plate, 3... Cooking heater, 4... Pan body, 5... Heat reflecting wall, 10...
Switch unit, 11... Control heater, 13
...Empty room, 14...Operation knob, 23...Movable contact piece, 24...Fixed contact piece, _S1 ...Bimetal switch, S _M ...Main switch.

Claims (1)

[Scope of Claims] 1. In an electric pot in which a cooking heater is provided at the bottom of the case body, a pot body inserted through the opening of the case body is placed, and this pot body is to be heated by the cooking heater, the temperature control device is used. A switch unit that integrates a control heater, a control heat-sensitive switch that senses only the temperature of this control heater and turns on and off the cooking heater and control heater at the same time, and a power switch is installed on the back side of the case body. An electric pot characterized in that an operating section for operating the control heat-sensitive switch and the power switch, respectively, is provided so as to face the outside of the case body. 2. In an electric pot in which a cooking heater is provided at the bottom of the case body, a pot body inserted through the opening of the case body is placed, and this pot body is heated by the cooking heater, a control heater for temperature adjustment and a A control heat-sensitive switch that senses only the temperature of the control heater and simultaneously controls the cooking heater and the control heater on and off, and a switch unit that incorporates a power switch is attached to the back of the case body, and the control heat-sensitive switch One operation part for operating the switch and the power switch, respectively, is provided facing the outside of the case body, and another control heat-sensitive switch is provided for sensing the temperature of the cooking heater and controlling it at a limit temperature. electric pot.