JPH01299511A - Electrical cooker - Google Patents

Abstract

PURPOSE:To improve the washing performance of a cooking plate and the temperature sensitivity characteristic supplied from the cooking plate by installing a U-shaped heater rib which is positioned on the both sides of a heating body and projects downward, onto the back surface of the cooking plate and making longer the projection length of the side which is closer to the thermounit. CONSTITUTION:A U-shaped heater rib 3 which is positioned on the both sides of a heating body 2 and projects downward along the heating body 2 is installed onto the back surface of a cooking plate 1, and the rib side of said heater rib 3 on the remote side from a thermounit 4 which contacts the near center part of the cooking plate 1 is made shorter. Therefore, the depth of the groove part 5 between the heater ribs 3 during washing is reduced, and the contamination of the groove part 5 can be easily washing-removed. Further, since the projection length on the side of the heater rib 3 which is closer to the thermounit 4 is made longer, the radiation heat supplied from the heating body 2 to the thermounit 4 is not varied, and the thermal dispersion to the cooking plate 1 is permitted independently of the sensitivity characteristic, and the cooking plate 1 having the superior temperature distribution can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric cooking device such as a hot plate used in general households.

Conventional Technology In recent years, with an eye toward improving the cleanability after cooking, many electric cooking appliances such as hot plates have separated the cooking plate and heating element so that the cooking plate can be washed completely. It had a configuration as shown in Figure 3.

That is, in this FIG. 3, 51 is a heat shield plate,
A heating element 62 is disposed above it. Reference numeral 53 denotes an outer casing that covers the outside of the heat shield plate 51, and a thermo unit 54 that penetrates the heat shield plate 51 and reaches a position above the heating element 52 is disposed at the center of the inner surface of this outer casing 53. are doing. Reference numeral 65 denotes a cooking plate, and on the back side of this cooking plate 55 there are υ-shaped heater ribs 5 protruding from both sides along the shape of the heating element 52.
There are 6. The thermo unit 64 includes a thermostat main body 57 and a thermostat main body 67.
A cover 68 covers the upper surface and fixes the thermostat main body 57; a case 59 covers the outside of the cover 68 and guides the sliding movement of the cover 58; and a case 59 that always applies an upward biasing force to the cover 58. a spring 60 that gives
It is composed of a base 61 on which these are attached.

The thermostat main body 67 and the cover 58 are attached by passing a T-shaped sensing plate 63 through a hole 62 provided in the center of the cover 68, and then
This is done by inserting the support hole 65 of the thermostat main body 57 into the shaft 64 of the thermostat, and fixing the fixing member 66 from above. Force acts evenly. 6
Reference numeral 7 denotes a safety switch, and this safety switch 67 operates in conjunction with the attachment and detachment of the cooking plate 65. From this safety switch 67, there is also a contact rod 68 that passes through the heat shield plate 51 and comes into contact with the cooking plate 55. is projected by the biasing force of the safety switch spring 69. A gear 70 is integrated with a temperature adjustment shaft 71 of the thermostat main body 67, and this gear To is connected to a temperature adjustment knob 73 by a belt 72.

Problems to be Solved by the Invention In the above conventional electric cooker, the contacts of the safety switch 67 are closed in conjunction with the attachment and detachment of the cooking plate 55, and
The sensing plate 63 of the thermo unit 64 also comes into contact with the cooking plate 55 due to the biasing force of the spring 60. Then, when electricity is applied, the heating element 6
When the heating element 2 generates heat and the cooking plate 65 reaches a predetermined temperature, the thermostat main body 57 controls the energization of the heating element 52.

However, in the above conventional configuration, the belt 72
This absorbs the sliding movement of the thermo unit 64 and enables the temperature control knob 73 to be driven.
The sensor plate 63 was not brought into close contact with the sensing plate 63, and accurate temperature sensing was not performed. Furthermore, the position of the sensing plate 63 with respect to the cover 68 is in the center due to the need to receive the load of the spring 6o evenly. 68 has become very large, twice the diameter of thermostat 67, and its appearance has deteriorated. Furthermore, when the cooking is finished, the cooking plate 65 is removed and washed, but since the heater ribs 56 on the back side of the cooking plate 55 are arranged at the same height, cleaning is extremely difficult if the grooves become dirty. It was difficult. Also safety switch 67
Because it was installed independently, it was expensive.

The present invention has been made in view of the above-mentioned conventional problems, and includes improved cleaning properties of the cooking plate, improved temperature sensitivity characteristics from the cooking plate,
The purpose is to improve the appearance by making the cover part smaller and to reduce the cost of the safety switch part.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a dish-shaped heat shield plate, a heating element disposed above the heat shield plate, and a heat shield plate arranged on the sides and sides of the heat shield plate. an outer casing that covers the lower part; a thermo unit that is disposed approximately at the center of the inner surface of the outer casing and has a temperature sensing section that penetrates the heat shield and is located above the heating element;
It has a drive unit that instructs the thermo unit to change the temperature, and a cooking plate that is placed on the heating element, and is located on the back side of the cooking plate, on both sides of the heating element, and on the heating element. A U-shaped heater rib is provided that protrudes downward along the thermostat, and the heater rib has a longer protruding length on the side closer to the thermostat.

Further, in the thermostat unit, a sensing plate is slid in contact with the cooking plate by a biasing spring, and the sensing plate is arranged on a side portion of the upper surface of a cover that covers the thermostat main body.

Further, the temperature sensing portion of the thermo unit and the cooking plate are brought into contact with each other so that the side of the temperature sensing portion that is close to the outer periphery of the cover is brought into contact with the cooking plate first.

Further, the drive unit for instructing temperature variation in the thermostat unit) is composed of a pinion gear provided on the temperature adjustment shaft of the thermostat main body, and a rack gear slidably attached to the outer casing side and engaged with the pinion gear, The vertical sliding movement of the thermostat is absorbed between the engagement tooth thicknesses of both gears.

Furthermore, a safety switch is provided which opens and closes the supply of electricity to the heating element in conjunction with the sliding movement of the thermo unit against the cooking plate.

Function According to the above configuration, U-shaped heater ribs are provided on the back surface of the cooking plate and are located on both sides of the heating element and protrude downward along the heating element, and the heating rib is attached to the thermo unit. The protruding length of the closer side is longer, which not only makes it easier to clean between the heater lips, but also
The heat from the heating element can be dispersed over the entire surface of the cooking plate without changing the radiant heat from the heating element to the thermo unit, and as a result, an electric cooker with excellent temperature distribution can be obtained.

Furthermore, even when using a type of thermostat in which the mounting holes of the thermostat body are placed at the ends, the temperature sensing part that comes into contact with the cooking plate of the thermostat unit should be placed on the upper side of the cover that covers the thermostat body. Because of this, the cover can be made smaller, and as a result,
Not only does the appearance improve, the amount of heat in the atmosphere around the thermo unit can be reduced, and an electric cooker with good sensitivity characteristics can be obtained.

Also, even if the inner end of the sensing plate is placed in the center of the cover and is at the same position as the stress center of gravity of the biasing spring, the temperature sensing part of the thermo unit that is close to the outer periphery of the cover will cook first. Since the thermo unit is brought into contact with the plate to apply local stress to the biasing spring, the thermo unit is in close contact with the cooking plate while being inclined.As a result, a thermo unit structure with less variation in temperature sensing can be achieved. It will be done.

Furthermore, since the vertical sliding movement of the thermo unit is absorbed between the engaging tooth thickness of the rack gear and pinion gear for temperature adjustment, even if a gap is created between both gears and the biasing force is eliminated, both gears The thermo unit can be driven by the meshing of each tooth, resulting in a configuration that does not affect the close contact between the cooking plate and the thermostat.
It is possible to obtain temperature sensing with less variation.

Further, since the instruction to open and close the energization of the heating element of the safety switch is performed in conjunction with the sliding of the thermo unit against the cooking plate, there is no need for any member to operate the safety switch, resulting in an inexpensive configuration.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 and 2, 1 is a cooking plate, and on the back side of this cooking plate 1 are U-shaped heaters located on both sides of the heating element 2 and protruding downward along the heating element 2. Ribs 3 are provided. The heater rib 3 has a shorter rib side on the side farther away from the thermo unit 4 that abuts the substantially central portion of the cooking plate 1. Therefore, the depth of the grooves 5 between the heater ribs 3 during cleaning becomes shallow, and as a result, even if the grooves 6 become dirty, they can be easily washed. In addition, since the heater rib 3 has a longer protruding length on the side closer to the thermo unit 4, the radiant heat from the heating element 2 to the thermo unit 4 does not change, and as a result, regardless of the sensitivity characteristics, Since heat can be dispersed to the cooking plate 1, a cooking plate 1 with good temperature distribution can be obtained.

Next, the second purpose of improving the temperature sensing characteristics, improving the appearance by reducing the size of a part of the cover, and reducing the price of the safety switch section will be explained. The thermostat unit 4 is constructed by arranging a thermostat main body 6 inside, covering its upper surface with a cover 7, covering its sides with a case 8, and attaching the case 8 to a base 9. 1o is a biasing spring that biases the cover 7 upward. The thermostat main body 6 is attached to a cover 7, and the method of attachment is to pass a T-shaped temperature sensing portion 12 through a hole 11 provided in the cover 7 from above, and a through shaft 13 of the temperature sensing portion 12. The support hole 14 of the thermostat main body 6 is inserted into the thermostat body 6, and the fixing member 15 is tightened to attach the thermostat.

Further, the support hole 14 of the thermostat main body 6 is located at the end of the thermostat main body 6, so that the temperature sensing portion 12 is also located at the end of the cover 7. Further, the upper surface of the temperature sensing section 12 has an inclination that increases as it approaches the outer side of the cover 7. Therefore, when the cover 7 comes into contact with the cooking plate 1, the temperature sensing portion 1 of the cover 7
The second end comes into contact first, and as a result, irrespective of the position of the pressing center of gravity of the biasing spring 10, the temperature sensing part 12 is reliably brought into close contact with the entire surface of the cooking plate 1 before sliding is performed. It turns out.

Reference numeral 16 denotes a safety switch that opens and closes electricity to the heating element 2 in conjunction with the sliding contact of the thermo unit 4 with the cooking plate 1. The operation of this safety switch 16 is extended from the 7 langes 17 of the cover 7. This is done by pressing the switch suppressing piece 19 with the suppressing piece 18.

As is clear from the above description, in the embodiment of the present invention, since the temperature sensing part 12 is located at the end of the cover 7, a thermostat having a support hole 14 at the end of the bimetal is used. Even in this case, since the cover 7 can be made smaller, it not only looks better, but also the volume contained in the cover 7 can be made smaller, so that the temperature sensitivity characteristics of the thermostat body e can be improved. Furthermore, since the temperature sensing portion 12 is brought into reliable surface contact with the cooking plate 1, very good sensing characteristics can be obtained.

20 is a pinion gear attached to the temperature adjustment shaft 21 of the thermostat main body 6, and this pinion gear 20 is connected to the outer casing 23 via a rack gear 22 attached to the base 9.
The temperature control knob 24 is connected to the temperature control knob 24 located on the outside. Since the engagement width of the tooth thickness of the rack gear 2o and the pinion gear 22 is set to be greater than the contact sliding width of the thermo unit 4, the rack gear 20 and the pinion gear 22 are
The bond will never be broken. In this embodiment of the present invention, the sliding movement of the thermo unit 4 is controlled by the rack gear 2.
o and the pinion gear 22, and in this case, there is no connection tension as in conventional belt connections, so no unreasonable load is applied to the temperature sensing section 12.
It can be reliably brought into close contact with the cooking plate 1, and as a result,
Good temperature sensitivity characteristics can be obtained.

Further, as described above, the safety switch 16 operates in conjunction with the sliding movement of the thermo unit 4, so the safety switch 16
There is no need for various parts to operate the system, and as a result, reliable safety can be achieved with an inexpensive configuration.

Note that 25 is a dish-shaped heat shield plate, the heat generating element 2 is arranged above this heat shield plate 26, and the sides and bottom of this heat shield plate 25 are covered with an outer casing 23, and this outer casing 23 is provided. A thermo unit 4 is disposed approximately at the center of the inner surface of the casing 23, and this thermo unit 4 has a temperature sensing portion 12 provided at a position above the heating element 2, passing through the heat shield plate 26.

Effects of the Invention As is clear from the description of the embodiments above, in the electric cooker of the present invention, the heater ribs provided on the back side of the cooking plate on both sides of the heating element protrude on the side closer to the thermo unit. Because the length is long, it is not only possible to easily clean the grooves between the lips when cleaning, but also allows the heating element to be spread over the entire cooking plate without changing the radiant heat from the heating element to the thermo unit. As a result, an excellent temperature distribution can be obtained.

In addition, the thermo unit slides into contact with the cooking plate using a heating spring, and the temperature sensing part of this thermo unit is placed on the upper side of the cover that covers the thermostat body, and the sensing part is located on the side of the cover that covers the thermostat body. The temperature sensing part near the outer periphery is brought into contact with the cooking plate first, and the drive part that instructs the thermostat to change the temperature is a pinion gear installed on the temperature adjustment shaft of the thermostat body and a sliding part on the outer casing side. It consists of a rack gear that is movably mounted and engages with the pinion gear, and the vertical sliding movement of the thermo unit is absorbed between the thickness of the engagement teeth of both gears, so that the edge of the bimetal Even when using thermostats with support holes, the cover can be made smaller, which not only improves the appearance, but also reduces the air space around the thermostat body, resulting in less temperature-sensitive characteristics. It will be good.

Furthermore, the contact of the temperature sensing part with the cooking plate moves from a position different from the stress center of gravity of the biasing spring to the stress center of gravity, so that the contact of the temperature sensing part with the cooking plate is ensured. This provides excellent temperature sensitivity characteristics.

In addition, since the safety switch operates in conjunction with the thermostat sliding into contact with the cooking plate, the thermostat also serves as the pressing configuration, and there is no need to add large parts to operate the safety switch. , a safe electric cooker can be obtained with an inexpensive structure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric cooker showing an embodiment of the present invention;
FIG. 2 is an enlarged cross-sectional view of the vicinity of the thermo unit of the electric cooker, and FIG. 3 is a cross-sectional view of the conventional electric cooker. 1...Cooking board, 2...Heating element, 3...
... Heater rib, 4 ... Thermo unit, 6 ... Thermostat body, 7 ...
Cover, 10...Biasing spring, 12...
Temperature sensing section, 16...Safety switch, 2o...
... Pinion gear, 21 ... Temperature adjustment shaft,
22...Rack gear, 23.Old...Outer casing, 2
6... Heat shield plate.

Claims (5)

[Claims] (1) A dish-shaped heat shield, a heating element placed above the heat shield, an outer casing that covers the sides and bottom of the heat shield, and a substantially central part of the inner surface of the outer casing. a thermo unit arranged above the heat shield plate and provided with a temperature sensing section above the heat generating element; a drive section configured to instruct the thermo unit to vary the temperature; U-shaped heater ribs are provided on the back side of the cooking plate and are located on both sides of the heating element and protrude downward along the heating element. An electric cooker characterized by having a longer protruding length on the side closer to the unit. (2) The thermostat according to claim 1, wherein the thermo unit has a temperature sensing portion slid in contact with the cooking plate by a biasing spring, and the temperature sensing portion is arranged on a side portion of the upper surface of a cover that covers the thermostat main body. Electric cooker. (3) The contact between the temperature sensing part of the thermo unit and the cooking plate is as follows.
3. The electric cooker according to claim 2, wherein the temperature sensing portion near the outer periphery of the cover is brought into contact with the cooking plate first. (4) The drive unit that instructs the thermo unit to change the temperature is
The thermostat consists of a pinion gear installed on the temperature control shaft of the thermostat body, and a rack gear that is slidably attached to the outer casing and engages with the pinion gear. The electric cooking appliance according to claim 1, wherein the electric cooking appliance absorbs sliding movement. (5) The electric cooker according to claim 2, further comprising a safety switch that opens and closes electricity to the heating element in conjunction with the sliding movement of the thermo unit against the cooking plate.