JP2016013481A - rice cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rice cooker equipped with a lid body lock mechanism excellent for sealing a pressure container with improved safety by making a lock mechanism a double structure.SOLUTION: A rice cooker of the present invention includes a pressure container having a flange part, a main body container, a lid body 5D closing and sealing openings of the pressure container and the main body container, a first lock mechanism locking the lid body with the main body container, and a second lock mechanism 87' locking the lid body with the pressure container. The second lock mechanism has engaging parts 88A' to 88C' engaged with the flange part of the pressure container and an operation part which engages the engaging parts with the flange part or cancels the engagement. The engaging parts have: locking claws 88b, 88b'; and a fitting shaft 89b formed by an elastic body which holds the locking claws rotatably. Between the fitting shaft and the operation part is provided an expansion spring body S. The expansion spring body is strong enough not to allow engagement of the locking claws to cancel even when the operation part is operated in the state that internal pressure of the pressure container is high.

Description

  The present invention relates to a rice cooker, and more particularly to a pressure rice cooker provided with a lock mechanism that hermetically locks an opening of a pressure vessel with a lid.

In recent years, pressure cookers such as pressure cookers or pressure rice cookers have become widespread. This type of pressure cooker cooks with the pressure vessel raised to atmospheric pressure or higher during cooking, so when the pressure in the pressure vessel rises abnormally due to a failure, etc., a safety valve that releases this abnormal pressure to the outside Installation is indispensable, but if the lid is inadvertently opened during cooking, the heated high-temperature food will be scattered outside, making this lid inadvertent during cooking. A locking device is provided so as not to be opened (see, for example, Patent Documents 1 to 4 below).

  For example, Patent Document 1 below discloses a pressure cooking utensil lid provided with a locking device.

The lid for pressure cooking utensils includes a cooking container provided with a flange on the periphery of the opening, a circular support covering the opening of the cooking container, a plurality of movable clamping parts for clamping the flange part of the cooking container, and an axis A mechanism composed of a rotatable member, a mechanism for controlling the sandwiching portion by the rotation of the rotatable member, a grip for operating a lid directly or indirectly connected to the circular support, And an operating means for rotating a rotatable member.
In this pressure cooking utensil lid, by operating the operating means, the rotatable member rotates, the plurality of movable clamping portions clamp the flange portion of the cooking container, and the lid body is locked to the cooking container. It has become so.

  Patent Document 2 below discloses an electric pressure cooker provided with a similar locking device.

  With reference to FIG. 52 and FIG. 53, the electric pressure cooker described in the following patent document 2 is demonstrated. 52 is a perspective view of the electric pressure cooker described in Patent Document 2 below, and FIG. 53 is an exploded perspective view of the lid portion of the electric pressure cooker of FIG.

  The electric pressure cooker 200 has a hook 201 provided with a flange on the periphery of the opening, a hook body 202 having an opening for receiving the hook, and a lid 203 for covering and sealing the opening of the hook and the hook body. ing. The lid 203 is formed by combining an upper lid 203a and a lower lid 203b, and a hole 204 having a predetermined size for restricting the movement of the auxiliary lid 206 is formed in the lower lid 203b. The auxiliary lid 206 is connected to the lower lid 203b by a leaf spring 205 so as to be movable up and down. A plurality of spaces 204 a communicating with the holes 204 are formed at the four corners of the lower lid 203 b. One end of the plurality of coupling members 207 is positioned in the space portion 204a, and these coupling members are sized so that they can accurately reciprocate linearly. This electric pressure cooker is locked by driving means such as a motor so that the hook and the auxiliary lid are not opened by the pressure of steam. That is, there is provided means 208 for locking the shuttle and the auxiliary lid 206 by converting the rotational force of the motor 209 into linear reciprocating motion. In this electric pressure hook, the locking means 208 is operated by the rotation of the motor 209, and the flange portion of the hook 201 is locked by the coupling member 207. The electric pressure cooker is provided with a manual rotating means 210 for manually driving the locking means 208 when the locking means does not operate.

  Further, in this type of electric pressure cooker, the pressure valve is forcibly opened and closed once or plural times in the boiling maintenance process after the water absorption process, and the pressure in the pan is increased (1.2 Pressure type that lowers from atmospheric pressure) to near atmospheric pressure at a stretch, causes the cooked rice to boil vigorously in the pan, so-called bumping phenomenon, and stir the cooked rice using this bumping phenomenon to cook rice Rice cookers are known.

  The pressure-type rice cooker disclosed in the following Patent Document 3 is a water-absorbing step for controlling the heating means so as to keep the rice of the cooked rice below the gelatinization temperature, so that the rice absorbs water, and the cooked rice is in a boiling state Boil-up after the boiling-maintenance process, the heating-up process that raises the temperature until it becomes, the boiling maintenance process that maintains the cooked rice in a boiling state and opens the pressure valve for a predetermined time to cause a bumping phenomenon in the pan It is equipped with a control device that cooks rice through a series of rice cooking processes such as a steaming process for steaming rice.

  According to this pressure rice cooker, in the water absorption process, water is absorbed at a predetermined temperature, so that water penetrates to the core of the rice, and in the boiling maintenance process, a sudden boiling phenomenon is caused in the pan, and the cooked rice in the pan is forced. The rice is cooked vigorously, so there is no cooking unevenness, and many "crab holes" that are symbols of deliciousness are formed on the surface of the cooked rice.

JP-T-2008-522649 (paragraphs [0013] to [0020], FIG. 1) JP-A-10-152 (paragraphs [0016] to [0021], FIG. 1 and FIG. 2) Japanese Patent No. 3851293 (paragraphs [0009] to [0012], FIG. 2)

  All of these pressure-type rice cookers are for domestic use, with the amount of rice cooked approximately 10 cups as the upper limit. However, recently, a large-sized rice cooker has been required mainly for business use, which can increase the amount of rice cooking from 10 cups so far, for example, about 33 cups of rice can be cooked at a time. In order to meet this demand, it is impossible to increase the size simply by using the structure of the pressure rice cooker developed so far. The reason is that when the amount of cooked rice is small, it was possible to cope with the safety device developed so far, but when the amount of cooked rice increases, the safety measures must be further strengthened. That is, if you try to cook about 33 cups of rice at the same time by causing a bumping phenomenon in the pan, the pan will increase in size as well as the main body of the rice cooker that houses the pan, In addition, the heating means becomes high capacity. Therefore, the members constituting the lid and the rice cooker body are heated to a high temperature during rice cooking and are subjected to high pressure.

  Therefore, the safety measures must be taken not only for the lid but also for the rice cooker body. If a member constituting the rice cooker body, for example, a frame frame provided around the opening of the rice cooker body is formed of a synthetic resin molded body, the synthetic resin molded body is heated to a high temperature and a high pressure is applied. In particular, when the pressure in the pan is instantaneously lowered from a high pressure (for example, 1.2 atmospheres) to near atmospheric pressure, a sudden pressure fluctuation occurs, and the frame frame expands or contracts greatly with this pressure fluctuation. To do. On the other hand, since this frame frame is provided with a locking portion that locks the lid, there is a risk that the locking mechanism of the lid will come off during expansion or contraction. As a countermeasure, if the entire frame is made of a metal material, for example, die-casting, it becomes solid. However, due to the increase in the size of the pot, the rice cooker body and the lid, the weight is originally heavy, and the metal frame If a frame is used, the weight will become heavier and handling of the rice cooker will be difficult, and an increase in weight will be a major issue.

  In recent years, this type of pressure-type rice cooker has a tendency that the pressure is further increased, for example, higher than 2.0 atm. Therefore, this type of pressure rice cooker tends to have higher safety standards. However, when such a high safety standard is set, it is impossible to cope with the conventional safety device, and it is essential to solve the potential problem as described above. As mentioned above, although the pressure type rice cooker was demonstrated, the higher safety | security is requested | required also of other pressure cookers.

  Therefore, the present invention has been made on the basis of the above-mentioned background, and an object of the present invention is to provide a lid locking mechanism suitable for sealing a pressure vessel that has a double locking mechanism to enhance safety. The purpose is to provide a cooker equipped.

In order to achieve the above object, a rice cooker according to claim 1 of the present invention comprises:
A main body provided with a bottomed pressure vessel having an opening and having a flange portion extending outward from the periphery of the opening, and a heating means that accommodates the pressure vessel and heats the cooked rice in the pressure vessel A container, a lid that closes and seals the opening of the pressure container and the main body container, and a lid locking mechanism that locks the lid to the pressure container and the main body container,
The lid lock mechanism includes a first lock mechanism that locks the lid to the main body container, and a second lock mechanism that locks the lid to the pressure container,
The second locking mechanism includes a locking portion that is locked to the flange portion of the pressure vessel, and an operation portion that locks the locking portion to the flange portion or releases the locking.
The locking portion has a locking claw and a mounting shaft that rotatably holds the locking claw,
An extension spring body is provided between the mounting shaft of the locking portion and the operation portion,
The extension spring body has such a strength that the locking claw cannot be released when the internal pressure of the pressure vessel is high.
Moreover, the rice cooker of Claim 2 of this invention is the rice cooker of the said 1st aspect of Claim 1, The mounting shaft which hold | maintains the said latching claw rotatably is formed with the elastic body. It is characterized by being.

  By providing the above configuration, the present invention has the following excellent effects. In other words, according to the first aspect of the present invention, the lid lock mechanism includes the first and second lock mechanisms and is a double lock mechanism. Will not be opened carelessly and safety will be improved. In addition, since the extension spring body is provided between the mounting shaft of the locking portion and the operation portion, the operation portion is erroneously operated while the flange portion of the pressure vessel is locked by the locking portion. Even if the operation is performed, the extension spring body S is extended so that the engagement of the engagement portion is not released, so that the lock of the second lock mechanism is not released and the safety is further improved.

  According to the invention of claim 2, since the mounting shaft for rotatably holding the locking claw in the locking portion of the second lock mechanism is formed of an elastic body, the locking portion is operated by operating the operating portion. Even if an overload is applied to the mounting shaft, the overload can be absorbed by the mounting shaft itself.

FIG. 1: shows the pressure type rice cooker provided with the cover body locking mechanism which concerns on embodiment of this invention, FIG. 1A is a front view, FIG. 1B is a side view. FIG. 2 is a top view of the pressure rice cooker of FIG. FIG. 3 is a side view of the pressure rice cooker of FIG. 1 with the lid open. FIG. 4 is an enlarged view of a part of the lid of FIG. FIG. 5 is an exploded perspective view of the pressure rice cooker of FIG. 1 with the storage tank and the lock operation lever removed from the lid. 6 is a cross-sectional view of the pressure rice cooker of FIG. 2 taken along line VI-VI. 7 is a cross-sectional view of the pressure rice cooker of FIG. 2 cut along the line VII-VII. FIG. 8 is an enlarged cross-sectional view in which a part of the lid of FIG. 6 is enlarged. FIG. 9 is a perspective view showing a state in the lid body by removing the lid cover from the lid body of the pressure rice cooker in FIG. 1. FIG. 10 is a perspective view showing an internal skeleton structure by removing the main body cover and the lid cover from the pressure rice cooker of FIG. FIG. 11 is a perspective view of the skeleton structure of FIG. 10 with the lid portion opened. FIG. 12 is a perspective view of a state in which some parts are removed from the skeleton structure of FIG. FIG. 13 is a perspective view of the skeleton structure of FIG. 12 viewed from another angle. 14 is a rear view of the heater support of FIG. 10 as viewed from the back. 15 is a rear view of the lid portion of FIG. 13 as viewed from the back. FIG. 16 is an enlarged view of the hinge portion of FIG. FIG. 17 is an enlarged cross-sectional view of the hinge mechanism portion of FIG. 18 is a cross-sectional view for explaining the operation of the hinge mechanism of FIG. FIG. 19 is a curve diagram for explaining the operation of the hinge mechanism of FIG. 20 is a perspective view of the frame cover of FIG. 21 is a cross-sectional view of a part of the frame cover of FIG. 22 is a perspective view of a disc-shaped cam plate portion mounted on the lid of the pressure rice cooker of FIG. FIG. 23 is a perspective view of the disc-shaped cam plate of FIG. FIG. 24 is a top view showing the cam lock member of the disk-shaped cam plate portion of FIG. FIG. 25 is an enlarged view of the lid portion of FIG. FIG. 26 is an enlarged view of the lid portion of FIG. 25 viewed from another angle. FIG. 27 is a perspective view of the actuating member of FIG. FIG. 28 is an enlarged rear view in which the holding claw portion of FIG. 25 is enlarged. FIG. 29 is an enlarged cross-sectional view of the upper lid portion provided with the hold claws of FIG. 30 is a top view showing a state where the pan is held by the pan locking mechanism of FIG. 31 is a rear view of the lid portion of FIG. 25 as seen from the back. FIG. 32 is an enlarged cross-sectional view in which the lid portion of FIG. 6 is enlarged. FIG. 33 is an enlarged cross-sectional view of the lid portion of FIG. 6 as seen from another angle. FIG. 34 is an enlarged cross-sectional view of the lid portion of FIG. 6 as seen from another angle. FIG. 35 is a perspective view showing the pressure valve of FIG. 36 shows the valve seat of FIG. 35, FIG. 36A is an enlarged perspective view thereof, and FIG. 36B is a sectional view taken along line XXXVIB-XXXVIB of FIG. 36A. FIG. 37 is an explanatory view of opening and closing the valve opening of the valve seat of FIG. 36 with a pressure adjusting ball. 38 is a perspective view of the lid locking mechanism of FIG. 39 is a partial cross-sectional view of the lid locking mechanism of FIG. 40 is an exploded perspective view of the lid locking mechanism of FIG. FIG. 41 is a block diagram of the control device. FIG. 42 is a flowchart showing the rice cooking process. FIG. 43 is a temperature and pressure curve diagram showing changes in temperature and pressure in the pan during the rice cooking process. FIG. 44 is a block diagram of a safety control device mounted on the pressure rice cooker of FIG. FIG. 45 is a plan view showing a modification of the lid. 46 is an enlarged perspective view in which a part of the lid of FIG. 45 is enlarged. 47 is a perspective view of the lid frame assembly of FIG. 48 is a cross-sectional view of a part of FIG. FIG. 49 is a perspective view of the arm bar of FIG. 50 is an exploded perspective view of the lid locking mechanism of FIG. FIG. 51 is a block diagram of a safety control device according to a modification. FIG. 52 is a perspective view of a conventional electric pressure cooker. 53 is an exploded perspective view of the lid portion of the electric pressure cooker of FIG.

  Hereinafter, a pressure rice cooker according to an embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a pressure rice cooker for embodying the technical idea of the present invention, and is not intended to specify the present invention, and claims It is equally applicable to those of other embodiments included in the range of, for example, pressure cookers other than rice cookers.

(overall structure)
With reference mainly to FIGS. 1-3, FIG. 6, and FIG. 7, the whole structure of the pressure type rice cooker which concerns on embodiment of this invention is demonstrated. 1 shows a pressure rice cooker according to an embodiment of the present invention, FIG. 1A is a front view, FIG. 1B is a side view, FIG. 2 is a top view of the pressure rice cooker in FIG. 1, and FIG. 6 is a side view of the pressure rice cooker with the lid opened, FIG. 6 is a cross-sectional view of the pressure rice cooker of FIG. 2 taken along line VI-VI, and FIG. 7 is a cross-sectional view of the pressure rice cooker of FIG. It is sectional drawing cut | disconnected by the VII line.

  A pressure-type rice cooker (hereinafter referred to as a rice cooker) 1 according to an embodiment of the present invention is a large rice cooker that can cook a large amount of rice to be cooked at once, for example, more than 10 cups and about 33 cups of rice and water. It is the rice cooker which uses the pan 3 which consists of a pressure vessel, and raises the pressure in a pan to atmospheric pressure or more, for example, about 1.2 atmospheres at the time of rice cooking. That is, as shown in FIGS. 6 and 7, the rice cooker 1 includes a pan 3 into which a rice to be cooked containing rice and water is put, an opening in which the pan 3 is accommodated, and an inner portion of the pan. 3 is a large-sized rice cooker main body (hereinafter referred to as a main body container) 2 having a bottom heater H1 and a side heater H2 for heating the cooked rice in the body 3, and a main body pivotally supported by a hinge mechanism 54 on one side of the main body container 2 And a large lid 5 that covers the opening of the container 2 and the pot 3.

  The lid 5 has a lid locking mechanism 70 for locking the lid 5 to the main body container 2 (see FIG. 11, this “lid locking mechanism” corresponds to the first locking mechanism of the present invention). There are provided two sets of internal pressure adjusting devices 90A and 90B for adjusting the pressure in the pan 3, and a rice ball storage tank (hereinafter referred to as a storage tank) 100 for temporarily storing a portion of the taste component during cooking. Yes. As shown in FIG. 12, the lid locking mechanism 70 includes a lid locking mechanism 71 that locks the lid 5 to the main body container 2 and a pan locking mechanism 87 that locks the lid 5 to the pan 3 (this “pan locking mechanism”). Corresponds to the second locking mechanism of the present invention.), And the lid 5 is not inadvertently opened due to an increase in pressure in the pan 3 during rice cooking. The lid 5 is provided with two safety valves SV (see FIG. 35) that are opened when the pressure in the pan 3 abnormally increases. In addition to these safety valves, there is a gap in a part of the hinge mechanism 54 part when the abnormal pressure rises, and a safety device is provided in the hinge mechanism part to release the abnormal pressure to the outside through this gap. The storage tank 100 is common to the two sets of internal pressure adjusting devices 90 </ b> A and 90 </ b> B, and is detachably attached to the lid 5. Hereinafter, each component which comprises this rice cooker is demonstrated.

  As shown in FIGS. 6 and 7, the pan 3 has a substantially disc-shaped bottom 3b having a relatively large bottom area, and a side wall 3c erected at a predetermined height from the periphery of the bottom. The upper part of the opening is opened, and a bowl-shaped flange 3d is provided at the periphery of the opening 3a, and is formed of a large pressure vessel capable of accommodating a large amount of cooked rice, for example, about 33 cups of rice and water. Yes. This pressure vessel is formed of a clad material in which an inner layer made of a material having high thermal conductivity, such as copper or aluminum, and an outer layer made of a magnetic material, such as stainless steel, are bonded together. The inner layer surface is covered with a fluororesin or the like. In addition, this pressure vessel is not limited to this thing, The container created using the other well-known board | plate material may be sufficient.

  This pan 3 is heated from the bottom of the pan, that is, the bottom portion 3b, and causes an intense boiling phenomenon, that is, a bumping phenomenon inside the rice, and the rice cooker in the central portion of the pan is moved to the side wall of the pan using this bumping phenomenon. It is designed to move and stir. This bumping phenomenon is less likely to occur when the pan 3 has a small pan bottom area and is tall, i.e., a deep bottom, so that it is short and shallow, such as a diameter of about 400 mm and a depth of about 180 mm. Is formed. In addition, in this embodiment, although the pan was formed with the circular cylindrical container, you may make it an ellipse shape or another shape container.

  The rice cooker 1 uses a large pot 3, and a large amount of rice, for example, about 33 cups, is accommodated in the pot 3 at the same time. Since the rice to be cooked is generated and stirred, the mechanical strength must be increased as compared with conventional rice cookers, and a higher safety mechanism is required. Therefore, the main body container 2 and the lid 5 are constituted by an assembly in which frames with high mechanical strength are used and assembled with these frames.

(Main body container)
First, the main body container will be described with reference to FIGS. 9 is a perspective view showing a state in which the lid cover is removed from the lid of the pressure rice cooker shown in FIG. 1, and FIG. 10 is a diagram showing the main body cover and the lid cover removed from the pressure rice cooker shown in FIG. 11 is a perspective view showing the internal skeleton structure, FIG. 11 is a perspective view of the skeleton structure of FIG. 10 with the lid portion opened, and FIG. 12 is a perspective view of the skeleton structure of FIG. 10 with some components removed. 13 is a perspective view of the skeleton structure of FIG. 12 as seen from a different angle, FIG. 14 is a rear view of the heater support base of FIG. 10, and FIG. 15 is a rear view of the lid portion of FIG.

  6, 10, and 11, the main body container 2 includes a main body frame assembly 20, an inner case 4 that is attached to the inside of the main body frame assembly 20 and accommodates the pot 3 therein, a bottom heater H <b> 1, a side surface A control device C (see FIG. 41) for controlling the heater H2, the lid heater H3, the blower FAN, and the like, a main body cover 29 covering the outer periphery of the main body frame assembly 20, and an operation display unit 30 (see FIG. 1). As shown in FIGS. 10 and 11, the main body frame assembly 20 is installed on a base 21 having a size that can be placed on an installation base having a predetermined size, and is installed above the base to fix and support the bottom heater H <b> 1. Heater support base 22, an intermediate frame 23 fixed on the heater support base to which the bearing frame 55 of the hinge mechanism 54 is attached, and a frame cover 24 above the intermediate frame frame and into which the pan 3 is inserted. And these parts are constituted by an assembly in which they are stacked in this order. The inner case 4 includes a cylindrical case 4a to which the side heater H2 is attached and a heater support base 22.

  As shown in FIG. 11, the base 21 includes a disc-shaped bottom wall portion 21a having a predetermined thickness and a predetermined diameter, and an annular side wall portion 21b erected at a predetermined height from the periphery of the bottom wall portion. And is formed of a synthetic resin molded body. The bottom wall portion 21a has a predetermined diameter, and the bottom wall portion 21a is provided with reinforcing ribs in a substantially lattice shape. The side wall part 21b consists of a comparatively thin plate-shaped body, and the rib 21 is provided in the side wall part 21b at predetermined intervals. Since the bottom wall portion 21a and the side wall portion 21b are reinforced by the reinforcing rib, the mechanical strength is increased, and the thickness can be reduced and the weight is reduced.

The base 21 includes a cutout portion 21c which the body cover 29 on the outer periphery of the side wall portion 21b top (see FIG. 6) is mounted, the struts 21 ₁ a plurality of erected upward from the notch walls predetermined Are arranged at substantially equal intervals. Struts 21 ₁ a plurality of has a gap lye height heater support base 22 is disposed between the intermediate frame frame 23. The top of the struts 21 ₁ heater support base 22 is fixed to. The base 21 is provided with a plurality of pedestals 21d near the outer periphery of the bottom surface. By these pedestals 21d, the rice cooker is installed with a predetermined gap between it and the table.

As shown in FIGS. 12 and 14, the heater support 22 includes a disc-shaped bottom wall portion 22 a having a predetermined thickness and a predetermined diameter, and an annular shape standing upright from the periphery of the bottom wall portion. It has a side wall portion 22b, is formed of a shallow circular dish-shaped support base, and is formed of a synthetic resin molded body having high heat resistance and mechanical strength. That is, the bottom wall portion 22a includes a pan bottom temperature sensors S1 sensor insertion hole 22 ₃ (see FIG. 6) is inserted in the center, concentric inner cylindrical member 22e ₁ and outside the outer periphery of the insertion hole 22 ₃ a tubular member 22e _2, and a plurality of recessed grooves 22 ₂ provided radially toward this outer tubular member 22e ₂ on the side wall portion 22b is formed. Incidentally, bottom heaters H1 is supported by the portion protruded by the concave grooves 22 ₂ of the plurality of are formed. The inner cylindrical body 22e ₁ and the outer cylindrical body 22e ₂ have a predetermined gap between both cylindrical bodies, and this gap penetrates the bottom wall portion 22a. Recessed groove 22 _second plurality is formed in a substantially equal angle to the surface of the bottom wall portion 22a. The formation of these recessed grooves 22 _2, the surface of the bottom wall portion 22a is partitioned into a plurality of regions _22a 1 _{~22a 8} triangular. Of these partitioned regions _22a 1 _{~22a 8,} and the side wall portion 22b of a part of the divided region _22a 1, 22a ₈ and the region 22a ₅ is excised, the gap _22b 1, 22b ₂ is formed, a gap 22b Reference numeral ₁ faces the fan FAN, and the gap 22b ₂ is an outlet for blowing air. Further, air volume adjusting means 22A _{1 to} 22A ₃ for adjusting the air volume from the fan FAN are provided in these regions 22a _{1 to} 22a ₈ . Since the regions 22a ₁ and 22a ₈ face the blower FAN, the air volume adjusting means 22A _{1 in} the region 22a ₁ includes a partition wall 22c that blocks air flow, and the air flow blocked by the partition wall on the back side of the bottom wall portion 22a. consists of a blast hole 22d to be sent to the air volume adjusting means 22A ₂ area 22a ₈ is composed of a partition wall 22f for blocking the blowing, the blowing hole 22g Send blowing blocked with the partition wall to the rear side of the bottom wall portion 22a , air volume adjusting means 22A ₃ in other areas has a through hole penetrating the bottom wall portion 22a. By this air volume adjusting means, the bottom heater H1 supported by the heater support 22 can be efficiently cooled to prevent overheating. In particular, this main body container becomes large, and if it is all made of a metal material, its weight increases. Therefore, in order to reduce the weight, the main body container is made of a synthetic resin molding. Then, since this rice cooker uses a high-output heater (4.8 kW), problems such as the formation of the molded body exposed to high temperature due to the heat from this high-output heater appear, The problem can be solved by providing this air volume adjusting means. The sensor insertion hole 22 _3, since the periphery thereof is surrounded by the inner cylindrical member 22e ₁ and the outer tubular member 22e _2, it is possible to prevent the pan bottom temperature sensor S1 is erroneously detected is cooled by the blower FAN . The rear of the bottom wall portion 22a, at positions corresponding to the sensor insertion hole 22 _3, the drain port Dr (Fig. 6, refer to FIG. 7) and connected to the drain pipe to the drain port (not shown) made of the drainage device Is provided. By providing this drainage device, water leaked into the inner case 4 is discharged to the outside without accumulating at the bottom.

As shown in FIGS. 12 and 13, the intermediate frame 23 is made of a synthetic resin molding having a predetermined thickness and an annular body having a hollow hole therein, and having high heat resistance and mechanical strength. ing. The intermediate frame 23 is a member for connecting the base 21 and the frame cover 24 and fixing the pair of bearing frames 55. The intermediate frame 23 has a hollow hole 23a having a predetermined diameter and a thick peripheral wall portion 23b extending outward from the hollow hole. Since the annular body has a predetermined thickness, the peripheral wall portion 23b has upper and lower opening edges 23c and 23d. The hollow hole 23 a is a circular hole, and its inner diameter is slightly larger than the outer diameter of the pan 3. Above the opening edge 23c, posts 23 ₁ a plurality of are provided with a predetermined spacing. Each strut 23 ₁ inside is formed a screw insertion hole, the insertion hole has reached the open end of the lower through the annulus. Around the end of the upper opening edge 23c, a protruding wall 23c ′ is formed with an inner wall surface standing upright by a predetermined height. The lower opening edge 23d is formed with a pair of mounting bases 23d 'whose wall surfaces are erected at a predetermined height. The lower ends of the pair of bearing frames 55 are fixed to the mounting bases 23d ′.

As shown in FIGS. 20 and 21, the frame cover 24 is made of a synthetic resin molded body having a predetermined thickness and a hollow body provided with a hollow hole, and having high heat resistance and mechanical strength. Yes. A pair of bearing frames 55 is attached to the frame cover 24 and is fixed above the intermediate frame frame 23. The frame cover 24 has a hollow hole 24a having a predetermined diameter and a peripheral wall portion 24b extending outward from the hollow hole. Since the annular wall has a predetermined thickness, the peripheral wall portion 24b has upper and lower opening edges 24c and 24d and inner and outer peripheral walls 24e and 24f. The hollow hole 24 a is a circular hole, and its inner diameter is slightly larger than the outer diameter of the pan 3. The peripheral wall portion 24b is formed to be slightly wider than the lower opening edge 24d. As shown in FIG. 21, the inner peripheral wall 24e has an upper opening edge 24c portion erected upward at a predetermined height, and a mounting portion 24g on which the flange portion 3d of the pan 3 is placed is formed on this erected portion. Has been. Further, the inner peripheral wall 24e, post 24 ₁ a plurality of are provided with a predetermined spacing. The outer peripheral wall 24f, the bearing fixing portion 26 for attaching the body hook 25 and a pair of bearings frame 55 having a locking claw 25 ₁ inside. As shown in FIG. 20, the main body locking portion 25 and the bearing fixing portion 26 are provided at positions facing the outer peripheral wall 24f. As shown in FIG. 21, the main body locking portion 25 is formed by processing a protruding wall 25A in which a part of the outer peripheral wall 24f protrudes outward by a predetermined size. That is, the projection wall 25A has upper and lower walls 25a and 25b and an outer wall 25c having a predetermined size, and the upper and lower walls are penetrated by the through hole 25d. The through-hole 25d has upper and lower openings 25a ′ and 25b ′ on the surfaces of the upper and lower walls 25a and 25b, respectively, and the upper opening 25a ′ has a size into which the locking frame body 77 (see FIG. 39) is inserted. The lower opening 25b ′ is larger than the upper opening 25a ′. The through hole 25d is engaging claw 25 ₁ is formed therein. The locking claw 25 ₁ is formed on the outer peripheral wall 24f side. Moreover, this main body latching | locking part 25 is also a handle part at the time of lifting and moving the rice cooker 1 with the hinge mechanism 54 part.

  In assembling the main body container 2, the main body frame assembly 20 is first assembled. In the main body frame assembly 20, first, the heater support base 22 is placed and fixed above the base 21. Next, the bottom heater H1 is disposed on the heater support base 22, and the intermediate frame 23 is fixed thereon. Thereafter, the frame cover 24 is fixed on the intermediate frame to form the main body frame assembly 20. An electromagnetic induction coil wound in a donut shape is used for the bottom heater H1. The pan 3 has a larger pan bottom area than the side wall 3c, and a bottom heater H1 is provided on the bottom 3b of the pan bottom and the side wall 3c adjacent to the bottom to heat a large amount of cooked rice. As these bottom surface heaters H1, heaters having a relatively large capacity, for example, about 4.8 kW are used. In addition, this heater is not limited to an electromagnetic induction coil, You may use another heater.

  By assembling the main body frame, as shown in FIGS. 6 and 7, the main body frame assembly 20 includes a lower space 28 </ b> A between the base 21 and the heater support base 22 and between the heater support base 22 and the frame cover 24. The upper space 28B is formed with the intermediate frame 23 interposed therebetween. These upper and lower spaces 28A, 28B are of a predetermined size, and among these spaces, the lower space 28A has various control devices, an inverter 27, a fan FAN, and the like, and the upper space 28B has A bottomed inner case 4 for accommodating the pan 3 is arranged. The control device C (see FIG. 41) is composed of a control board on which an IC chip or the like is mounted, and this base control plate is installed in a gap such as the lower space 28A although not shown. The blower FAN takes in outside air from the intake port 29b, cools the inverter 27 with this outside air, and also cools the bottom heater H1 supported by the heater support base 22.

As shown in FIGS. 6 and 7, the inner case 4 includes a cylindrical case 4 a to which the side heater H 2 is attached and a heater support base 22, which are formed of a heat-resistant resin molding. . A pan bottom temperature sensor S <b> 1 is provided at the bottom of the heater support 22. The amount of cooked rice in the pan 3 is detected by detecting the temperature of the pan bottom with the pan bottom temperature sensor S1. In addition, the cylindrical case 4a has an outer peripheral wall surface, that is, an outer wall surface on the side where the pan 3 is accommodated, with an attachment portion to which the side heater H2 is attached. This attachment part is between the upper opening and the bottom, and is a recessed hole that is recessed to a predetermined depth from the inner peripheral wall surface on the side where the pan 3 is accommodated toward the outer peripheral wall surface. A side heater H2 is mounted in the recessed hole. The side heater H2 is composed of a linear heater wire or the like.

  As shown in FIGS. 1 and 6, a main body cover 29 is attached to the outer periphery of the main body frame assembly 20. The main body cover 29 is provided with an operation display unit 30 (see FIG. 1A) for performing operations such as rice cooking start, timer reservation, and heat retention. The operation display unit 30 includes an operation panel 30a provided with various operation keys, and a display panel 30b that displays a setting state set by the operation panel. The operation panel 30a is provided with a start key, a menu key, a reservation key, a heat retention key, and the like. An air inlet 29b is formed on the side wall surface of the main body cover 29, and a mesh plate 31 having a plurality of small holes is attached to the air inlet 29b.

(Lid structure)
The structure of the lid will be described mainly with reference to FIGS.

  As shown in FIGS. 6 to 8, the lid 5 includes an inner lid 5 </ b> A that closes the opening 3 a of the pan 3, and an upper lid 5 </ b> B that is positioned above the inner lid and closes the opening of the main body container 2. And a lid cover 69 covering the upper lid with a predetermined gap, and the upper lid 5B and the like are fixed to a lid frame assembly 50 assembled by a plurality of frames.

  As shown in FIGS. 9 and 10, the lid frame assembly 50 is an assembly in which two sets of lid frames F1 and F2 each having a set of two frames are crossed in a cross shape at an intermediate portion in the length direction. Is formed. In other words, the lid frame assembly 50 has two frames arranged substantially in parallel with a predetermined interval in the same manner as a parallel frame in which two frames are arranged in parallel with a predetermined interval. It is formed of a cross-girder-like assembly in which a parallel frame is crossed in the middle in the length direction.

  Of these lid frames F1, F2, one lid frame F1 has a length substantially the same as the diameter of the lid 5 and is composed of a pair of parallel frames 51 facing each other at a predetermined interval. The other lid frame body F2 has a length substantially the same as the diameter of the lid body 5 and is composed of a pair of parallel frames 52 facing each other at a predetermined interval. These lid frames F1 and F2 intersect in a cross shape, and a substantially square frame opening F12 (see FIG. 15) is formed at the intersection.

Of these lid frames F1 and F2, one lid frame F1, that is, the pair of parallel frames 51, has a hinge mechanism 54 connected to one end and a lid lock mechanism 71 connected to the other end, and the other lid frame. F2, i.e., the pair of parallel frames 52, are connected to a pan locking mechanism 87 that holds the flange portion 3d of the pan 3 at both ends thereof. Each of the parallel frames 51 has the same configuration in the lid frame body F1. One parallel frame 51 will be described. As shown in FIG. 15, the parallel frame 51 has a relatively long and wide elongated bottom plate portion 51 a and a pair of opposingly erected at a predetermined height substantially at right angles from both side edges in the longitudinal direction of the bottom plate portion. It is formed of a substantially U-shaped frame body including the side plate portion 51b. As shown in FIGS. 10 and 11, the parallel frame 51 has one end supported by the bearing frame 55 and the other end engaged with the hook portion of the frame cover 24 to support the large lid 5. It is a strong beam frame. That is, since the parallel frame 51 is subjected to the weight of the large lid 5 and a large pressure applied to the lid at the time of rice cooking as a load, the parallel frame 51 is configured with a strong mechanical strength obtained by bending a thick metal plate. Has been. The parallel frame 51 is also provided with a connecting portion for connecting the bearing frame 55 at one end and a fixing portion for fixing the lid lock mechanism 71 at the other end. Furthermore, connecting portions 51 ₁ and 51 ₂ for connecting the actuating member 88 (see FIG. 27) are provided at these end portions. The width of one parallel frame 51 constituting the lid frame F1 is, for example, 50 mm, and the interval between the two opposing parallel frames 51 is, for example, 143 mm. The thickness of the parallel frame 51 is, for example, 2.5 mm.

  Each of the parallel frames 52 has the same configuration in the other lid frame F2. The parallel frame 52 will be described. As shown in FIG. 15, the parallel frame 52 has a narrow bottom plate portion 52 a narrower than the parallel frame 51 and a pair of vertical plates standing at a predetermined height substantially at right angles from both side edges in the longitudinal direction of the bottom plate portion. It is formed of a substantially U-shaped frame body that is composed of opposing side plate portions 52b. The parallel frame 52 is also provided with a connecting portion for connecting the operating member 88 at both ends. The width of the parallel frame 52 is, for example, 30 mm, and the interval between the two opposing parallel frames 52, 52 is, for example, 159 mm. Moreover, the thickness of the parallel frame 52 is 2.5 mm. In this embodiment, the lid frame body F2 is disposed on the lid frame body F1 to form a cross-beam shape. However, the lid frame bodies F1 and F2 may be reversely arranged.

  Since the lid 5 is composed of the lid frame assembly 50 including the two sets of lid frames F1 and F2, the mechanical strength can be increased with a small amount of material. That is, according to the prior art, there are reinforcing means for the lid body in which the upper lid is formed of a material having a high mechanical strength, or a reinforcing plate material that covers the upper lid. Such a reinforcing means is provided by the present invention. As described above, a large amount of cooked rice, for example, about 33 cups of cooked rice cannot be applied to a rice cooker that cooks rice by causing a bumping phenomenon in the pan. By constructing the lid frame assembly 50 using two sets of lid frames F1 and F2 as in this embodiment, the mechanical strength can be increased with a small amount of material, and the assembly of the lid is simplified. Moreover, its weight can be reduced. Each lid frame F1, F2 is composed of two parallel frames 51, 52, and there is a gap between these parallel frames, so that the pan is held using this gap. A link mechanism or the like can be provided, space can be used effectively, and the link mechanism is not adversely affected by collision with other members.

  These lid frames F1 and F2 are formed with a substantially square frame opening F12 (see FIG. 15) at the intersection, and a pair of pressures are formed in the frame opening F12 as shown in FIGS. An intermediate cylinder 60 into which the valve 91 (see FIG. 8) is inserted, a disk-shaped disk-shaped cam plate 63 (see FIG. 32) around the outer periphery of the middle cylinder, and the disk-shaped cam plate. A rotating ring 66 to be rotated is attached.

  With reference to FIGS. 31 to 33, components such as the intermediate cylinder 60, the disc-shaped cam plate 63, and the rotating ring 66 attached to the frame opening F12 will be described. 31 is a rear view of the lid portion of FIG. 25 as viewed from the back, FIG. 32 is an enlarged cross-sectional view of the lid portion of FIG. 6, and FIG. 33 is an enlarged view of the lid portion of FIG. It is sectional drawing.

As shown in FIGS. 31 to 33, the intermediate cylinder 60 has a predetermined outer diameter, height, and a hollow hole inside, and is formed of a circular cylinder having a predetermined thickness, and has heat resistance and mechanical strength. It is made of a strong synthetic resin molding. In other words, the middle cylindrical body 60 comes into contact with a rice ball heated to a high temperature, and therefore is formed of a synthetic resin material that does not precipitate harmful substances in addition to heat resistance. The middle cylinder 60 is composed of a separate part from the upper lid. Selection of a synthetic resin is facilitated by using separate parts. The middle cylinder 60 has a hollow hole 60a therein and openings 60b and 60c of predetermined sizes at both ends, respectively, and the cylindrical part 100a (see FIG. 5) of the storage tank 100 is fitted into one opening 60b. The pair of pressure valves 91 disposed on the inner lid 5A is inserted into the other opening 60c (see FIG. 8). That is, the inner cylindrical body 60 has an outer diameter that is shorter than one side of the frame opening F12, and a hollow valve having an inner diameter that is disposed in the inner lid 5A. Yes. One opening 60b, the end portion is thicker, the mounting groove 60 ₁ annular packing Pa is mounted to the inside wall of the thick edge, a concave groove 60 ₂ on the outer periphery of the mounting groove Is formed. By providing the recessed groove 60 _2, creepage distance becomes long, it is possible to prevent the infiltration of such steam leakage and water from the outside from the inside. The mounting groove 60 _1, annular packing Pa is mounted. As for the other opening 60c part, the outer wall of the edge bulges to the outside, and the middle cylindrical body 60 is fixed to the upper lid 5B using this bulged part 60d. That is, it is fixed to the upper lid 5B by using an annular seal packing Pa1 having a concave groove fitted into the opening edge of the upper lid 5B and having a large seal area. Middle cylinder body 60, 33, as shown in FIG. 34, through the two through-holes 60 ₃ in the position opposed to the inside, one of the through-hole 60 ₄ is cylindrical wall between the through holes Is formed. The two through holes 60 _3, provided at a location corresponding to the cylinder 95 of the valve opening mechanism 94 (see FIG. 8), these through-holes 60 _3, as shown in FIG. 8, FIG. 32, the seal The packing 99 is fixed. Other through-holes 60 _4, steam temperature sensor S2 (see FIG. 41) is provided.

A middle cylinder body 60, an annular packing Pa is attached to the attachment groove 60 _1, the annular packing Pa is fixed by the fixing ring 61. The fixing ring 61 includes a circular cylinder 61a having a hollow hole having an inner diameter substantially the same as the inner diameter of the middle cylinder 60, and a predetermined thickness extending outward from a substantially central portion of the cylinder. The annular side portion 61b is formed of an annular body, and is formed of a heat-resistant synthetic resin molded body. In the state shown in FIGS. 32 and 33, the cylindrical body 61 a has a lower opening edge 61 a ′ as a pressing portion for the annular packing Pa. In the state shown in FIGS. 32 and 33, the annular side portion 61b is formed with an annular rib 61b ′ having a predetermined height on the upper surface of the annular side portion 61b with a predetermined gap. The gap between the annular rib 61b 'and the cylinder body 61a, the concave groove 61 ₁ is formed. The concave grooves 61 _1, annular rib 68b 'is inserted in the lock lever 68. Further, the annular side portion 61b is formed with an annular rib 61c that hangs downward by a predetermined length on the back surface in the state shown in FIGS. The annular rib 61c serves as a contact portion of a rotating ring 66 described later.

  The middle cylinder 60 is provided with a disk-shaped disc-shaped cam plate 63 on the outer periphery thereof.

  The disc-shaped cam plate 63 will be described with reference to FIGS. 22 is a perspective view of a disc-shaped cam plate portion attached to the lid of the pressure rice cooker of FIG. 1, and FIG. 23 is a perspective view of the disc-shaped cam plate of FIG.

  The disk-shaped cam plate 63 is a donut-shaped disk having an outer diameter diameter slightly shorter than one side of the frame opening F12 (see FIG. 15) and having a circular opening 63a having a predetermined inner diameter at the center, and having a predetermined thickness. It is made of a metal plate. The central opening 63 a is slightly larger than the outer diameter of the middle cylinder 60. The disc-shaped cam plate 63 is a peripheral portion 63b having a predetermined width from the opening 63a to the outer peripheral edge. The disc-shaped cam plate 63 intersects with a peripheral portion 63b on the center line passing through the center point O of the disk (the center point O is located at the center of the circular opening 63a) and the center line at 90 degrees. Three cam grooves 64 are formed at predetermined intervals on one peripheral portion 63b of the intersecting line. That is, the three cam grooves 64 are arranged in a peripheral part 63b where the center line passing through the center point O and the peripheral part 63b intersect, and in a peripheral part 63b where the center line orthogonal to the central line intersects the peripheral part 63b. It is installed. These cam grooves 64 have the same shape.

One cam groove will be described with reference to FIG. The cam groove 64 is formed as a narrow groove having a predetermined length along the shape of the peripheral portion 63b. The groove width has a width dimension that is moved narrowing contains the locking pin ₆₅₁ of the arm bar 65. The cam groove 64 includes a first cam groove 64a at one end, a second cam groove 64b at the other end, and a third cam groove 64c that connects the first and second cam grooves. The first cam groove 64a has the shortest distance from the center point O, the second cam groove 64b has the longest distance from the center point O, and the curved groove between the third cam grooves 64c is curved into a predetermined shape; It has become. Among these first to third cam grooves, the first cam groove 64a is composed of a substantially linear thin groove having the same shape, and is divided into two substantially at the middle portion in the length direction, that is, the grooves 64a ₁ and 64a ₂ . The length of _one groove 64a1 is θ2 (for example, 5 °) with respect to the center point 0. The second cam groove 64b is composed of a substantially linear thin groove having the same shape, and is divided into two substantially at the middle in the length direction, that is, the grooves 64b ₁ and 64b _2, and the length of _one groove 64b ₁ is The angle formed with the center point 0 is θ2. The third cam groove 64c is formed by a logarithmic spiral curve, and the angle formed between the third cam groove 64c and the center point 0 is θ1 (for example, 45 °). . The lock operation lever 68 is rotated in the range of this angle θ1. First, second cam grooves 64a, by 64b is 2 minutes substantially intermediate lengthwise movement of the locking pin 65 ₁ inserted into these cam grooves and movable to the both groove ends Become. Even if the lock operation lever 68 is rotated within the range of the angle θ1, the lock operation lever can be rotated by an extra angle θ2, and even if the lock operation lever 68 is slightly rotated, it is possible to prevent the pan lock mechanism from malfunctioning.

Three arm bars 65 are connected to the disc-shaped cam plate 63. These arm bars have the same shape. The one arm bar will be described. As shown in FIG. 22, the arm bar 65 has a first connecting portion 65a attached to the cam groove 64 of the disc-like cam plate 63 at one end and a second connecting portion connected to the locking member 80 (see FIG. 38) at the other end. The connecting portion 65b is formed of an elongated plate-like piece. The first coupling portion 65a, the locking pin 65 ₁ movable is fixed to the cam groove is inserted into the cam groove 64. The locking pin 65 ₁ is constituted small bolt threads, pins or the like. It is preferable to attach a rotating roll (not shown) to the locking pin. By mounting this rotating roll, the movement in the cam groove 64 becomes smooth. In the vicinity of the connecting portion 65a, the long hole 65 ₃ provided in the longitudinal direction are formed. The long hole 65 ₃ has a guide hole when the arm bar 65 is moved longitudinally. The long hole 65 _3, small bolt screw is inserted. This bolt screw is fixed to the parallel frame 51 or 52. Second coupling part 65b is being formed a pair of connection pieces 65b ₁ of a portion of the longitudinal side edges and bent to extend in the same direction of the arm bar 65, the rotation axis to these connecting pieces 65b ₁ 89b ₁ is an insertion hole ₆₅₂ for inserting the (see FIG. 26) is provided.

The disc-shaped cam plate 63 is formed with a lock hole 63c into which a cam stopper member 97 is inserted in a part of the outer peripheral edge. As shown in FIG. 24, the cam stopper member 97 includes an engaging claw 97a that enters the lock hole 63c, an abutting portion 97b that abuts against the side of the parallel frame 51 of the lid frame body F1, and a valve. a connecting portion 97c which is connected to the plunger frame 96a of the opening mechanism (see FIG. 34), and a fixing hole 97 ₁ to a support such as a frame, it is formed by bending process of metal plate. The cam stopper member 97, the corners of the framework opening F12, is rotatably fixed to the support member by inserting a screw into the fixing hole 97 _1. The connecting portion 97c is connected to the plunger frame 96a.

The operation of the cam stopper member will be described with reference to FIGS.

The disc-shaped cam plate 63 is rotated by a predetermined angle by the operation of the lock operation lever 68. When the lock operation lever 68 is rotated a predetermined angle, 23, as shown in 24, the locking pin 65 ₁ a first cam groove 64a of the cam groove 64, the second through the third cam groove 64c passes through the midpoint 64b of the cam groove 64b ', the turn on the switch SW during passage, then, the locking pin 65 ₁ is moved to the final position. In this state, the lock operation lever 68 is rotated by 45 ° and is in a normal position where rice cooking can be started.

When cooking process is started in this state, the solenoid is energized, the plunger 96 is retracted, the valve port 92 ₁ are closed by pressure regulating balls 93. As the plunger 96 is retracted, the plunger frame 96a is retracted, the cam stopper member 97 is rotated, and the locking claw 97a is moved into the lock hole 63c. In this case, still, the locking claw 97a In the vicinity of the substantially central portion of the lock hole 63c, not in contact with the stopper wall 63c _1. In this state, for some reason, the lock lever 68 is returned is incorrect operation, the locking pin 65 ₁ passes through the midpoint 64b ', at the time of this passage, the switch SW is turned off, the alarm to be erroneous (See FIG. 44). By this alarm, if the user returns the lock operation lever 68 to the normal position, the rice cooking process is continued without any trouble. However, the normal position is rotated in the reverse direction, the locking claw 97a of the cam stopper member abuts the stopper wall 63c ₁ of the lock hole 63c, moreover, the abutting portion 97b abuts on the frame wall parallel frame 51, The rotation of the disc-shaped cam plate 63 is restricted, and the lock operation lever 68 cannot be rotated. The lock in relation to the operating lever 68 and the locking pin 65 _1, the number times the force of the operation force by the operation of the lock lever 68 is going Kakaro the locking pin 65 _1, parallel cam stopper member 97 Since it abuts against the frame 51 and restricts its rotation, no excessive force is applied to the locking pin.

The disc-shaped cam plate 63 is fixed to the rotating ring 66. As shown in FIGS. 32 and 33, the rotating ring 66 is formed of a synthetic resin molded body having a hollow hole with a predetermined diameter, a relatively thick annular body, and having heat resistance. . The hollow hole is a circular hollow hole, and its diameter is slightly larger than the outer peripheral diameter of the fixing ring 61. The rotating ring 66 has upper and lower wall surfaces 66 a and 66 b and circular hole inner and outer wall surfaces 66 c and 66 d, and the inner wall surface 66 c is a contact surface that contacts the outer periphery of the annular rib 61 c of the fixing ring 61.

A plurality of screw holes (not shown) for fixing the lock operation lever 68 are formed in the upper wall surface 66a. A plurality of screw holes (not shown) for fixing the disc-shaped cam plate 63 are formed in the lower wall surface 66b. The lower wall surface 66b is provided with a recessed groove in the circumferential direction. The outer wall surface 66d, a groove 66 ₁ dent on the outer periphery are formed.

The rotating ring 66 is fixed between the fixing ring 61 and the pressing ring 67 so as to be rotatable by a predetermined angle θ3 (see FIG. 31). In other words, the rotation ring 66 rotates limited to the predetermined angle θ3. The rotation limit, as shown in FIG. 31, the allowable stopper protrusions 66b ₁ to restrict the rotation provided on the lower wall surface 66b of the rotating ring 66, the rotation of the stopper protrusions 66b ₁ formed in the lower wall 67d of the pressing ring 67 And a notch groove 67b ₁ having a predetermined length. This rotation limitation is because the rotation ring 66 is fixed to the lock operation lever 68, and the rotation ring is rotated by the rotation of the lock operation lever 68. Therefore, the rotation limitation of the rotation ring 66 is the rotation of the lock operation lever 68. Will limit. The predetermined angle θ3 is substantially the same as the rotation angle θ1 of the disc-shaped cam plate 63. Limiting the rotation of the lock operation lever 68 prevents excessive rotation of the lock operation lever and can prevent the disc-shaped cam plate 63 from being damaged. The holding ring 67 includes a hollow hole 67a having an inner diameter slightly larger than the outer diameter of the rotating ring 66, and an annular side portion 67b extending a predetermined length outward from the hollow hole and having a predetermined thickness. It consists of an annular body and is formed of a synthetic resin molding. Upper and lower walls 67c of the annular side portion 67b, of the 67d, the bottom wall 67d side, excised inner wall of the hollow hole 67a is a part, a groove 67 ₁ dent the cut portion is formed. The recessed groove 67 ₁ is made an annular groove, it is rotated by being coupled with the concave groove of the rotating ring 66 in the annular groove. The lock operation lever 68 is brought into contact with the surface of the upper wall 67c.

The rotation ring 66 is connected to the lock operation lever 68 and rotated by a predetermined angle. That is, when the disc-shaped cam plate 63 is rotated by a predetermined angle by the lock operation lever 68, the arm bar 65 connected to the cam groove 64 is located between the pair of parallel frames 51 or 52 and substantially parallel to these parallel frames. Move back and forth. That is, when the disc-shaped cam plate 63 in a state in which the locking pin 65 ₁ of the arm bar 65 is fitted into the first cam groove 64a of the cam groove 64 is rotated, the locking pin 65 ₁ of the cam groove 64 The third cam groove 64b is moved through the third cam groove 64c. The movement of the locking pin 65 ₁ of the arm bar 65, the arm bar 65 is extruded forward. When the disk-shaped cam plate 63 is returned in the reverse direction by the lock operation lever 68, the arm bar 65 is retracted from the original state, that is, the pushing direction. By the movement of the arm bar 65 in the front-rear direction, the holding claws 88b and 88b ′ of the pan lock mechanism 87 connected to the arm bar 65 are held or released.

As shown in FIG. 5, the surface of the lid frame assembly 50 is covered with a lid cover 69. The lid cover 69 is made of a surface-treated decorative cover, and has an opening 69a for attaching the lock operation lever 68 and the storage tank 100 at a substantially central portion thereof, a handle attachment portion 69b for attaching a handle handle to the outer peripheral portion, and a hinge covering the hinge mechanism 54. The cover 69c is fixed.

As shown in FIGS. 5, 32, and 33, the lock operation lever 68 includes an opening 68 a into which the storage tank 100 is inserted in the center, and a fixed ring 61 and a rotating ring 66 that extend outward from the opening. And an extending portion 68b that covers the upper surface of the holding ring 67, and a lever portion 68c having a predetermined length that extends outward from a part of the outer periphery of the extending portion, and is formed of a synthetic resin molding. Yes. The extended portion 68b, and recesses 68 ₁ of a predetermined depth is provided, a plurality of screw holes to screw to the rotation ring 66 in the bottom wall of the recess portion is formed. The recessed portion 68 ₁ around the opening is provided, the screw holes for fixing the rotating ring 66 in the recess portion is formed. When the lever 68c is rotated clockwise or counterclockwise by a predetermined angle, for example, 45 degrees, the disk-shaped cam plate 63 is rotated via the rotation ring 66, and the lock operation lever 68 is rotated by the pan lock mechanism 87. The hold claws 88b and 88b ′ are operated, and the hold claws 88b and 88b ′ are held in the flange portion 3d of the pan 3 or the hold is released. The extended portion 68b of the lock operation lever 68 is fixed to the substantially central portion of the lid body 5, and the storage tank 100 is detachably attached to the opening 68a formed in the extended portion 68b. According to this configuration, since the lock operation lever 68 and the storage tank 100 are collectively disposed at the center portion of the lid body 5, the design can be made more compact and the design can be improved as compared with the dispersal arrangement.

(Hinge mechanism)
The hinge mechanism will be described with reference to FIGS. 16 is an enlarged view of the hinge portion of FIG. 13, FIG. 17 is an enlarged sectional view of the hinge mechanism portion of FIG. 7, FIG. 18 is a sectional view for explaining the operation of the hinge mechanism of FIG. It is a curve figure explaining the effect | action of the hinge mechanism of FIG.

  The lid frame assembly 50 is fixed to the main body frame assembly 20 by a hinge mechanism 54. As shown in FIG. 16, the hinge mechanism 54 has a pair of bearing frames 55 and a connecting frame 56 that connects these bearing frames with a predetermined gap therebetween. Is provided with a spring mechanism 57 that smoothly opens and closes the lid 5 and stops the lid 5 at a predetermined position. As shown in FIGS. 5 and 7, the hinge mechanism 54 is covered with a hinge cover 54a. The pair of bearing frames 55 and the spring mechanism 57 have the same configuration. One bearing frame and spring mechanism will be described with reference to FIGS. 16 and 17.

As shown in FIGS. 16 and 17, the bearing frame 55 includes a pair of relatively long and narrow elongated bottom plate portions 55 a and a pair of standing plates that are erected at a predetermined height substantially at right angles from both side edges in the longitudinal direction of the bottom plate portions. Are formed in a substantially U-shaped frame body composed of opposing side plate portions 55b. Since this bearing frame 55 is loaded with a large pressure applied to the lid body 5 and the large pressure applied to the lid body during rice cooking, the bearing frame 55 is formed of a material having a high mechanical strength obtained by bending a thick metal plate material. Yes. In the state shown in FIG. 16, the bottom plate portion 55a is cut at a predetermined length from the upper end to the lower end, and a bent portion 55a ′ bent inward from the bottom plate portion 55a is formed in the cut gap 55s. provided, the through-hole 55 ₁ is formed of spring compression bar 57B in the bent portion 55a 'is inserted. Further, a bent portion 55c bent substantially at right angles to the inside is formed at the lower end portion of the bottom plate portion 55a, and the mount 23d ′ of the intermediate frame frame 23 (see FIG. 12) using the bent portion 55c. ) Using a fixing member.

As shown in FIG. 17, the pair of side plate portions 55b has one side plate portion 55b at one end, that is, the end portion on the side where the bottom plate portion 55a is cut off, and a shaft attachment portion 55b ₁ from below the shaft attachment portion. It has a frame attachment portion 55b ₂ extending substantially at right angles to the opposite direction to the bottom plate portion 55a, and an extension portion 55b ₃ extending relatively long toward the other end. The shaft mounting portion 55b ₁ is 17, in the state of FIG. 18, the long hole 55 ₂ of a predetermined length extending in the vertical direction is formed, the rotary shaft 58 is inserted through the long holes 55 _2. Rotary shaft 58 is moved up and down being guided by the long hole 55 _2.

As shown in FIG. 17, the spring mechanism 57 includes a coil spring 57 </ b> A having a hole of a predetermined size inside, and a spring compression rod 57 </ b> B inserted through the inner hole of the coil spring. The coil spring 57 </ b> A is formed of a compressible coil spring body, that is, an extension spring body, and is accommodated in the U-shaped frame body of the bearing frame 55. The spring compression rod 57B is a thin rod that is slightly shorter than the bearing frame 55 and is sized to be inserted into the inner hole of the coil spring 57A, and is formed of a metal rod having high mechanical strength. Incorporation of spring mechanism 57 to the bearing frame 55, inserted through one end of the spring compression bar 57B into the through hole 55 ₁ of the bent portion 55a ', by inserting the coil springs 57A to the spring compression bar 57B, the spring compression bar One end of 57B is fixed to the end portion 57a of the coil spring 57A using a fixing plate and assembled. The other end of the spring compression rod 57B is connected to the outermost connecting portion of the parallel frame 51 of the lid frame F1. When the other end of the spring compression rod 57B is pulled upward by this assembly, the coil spring 57A is compressed in the bearing frame 55. When the pulling force upward of the other end of the spring compression rod 57B is lost, the original state is restored by the restoring force of the coil spring 57A. By the compression force and restoring force of the coil spring 57A of the spring mechanism 57, the lid 5 can be opened and closed smoothly, and the lid 5 can be stopped at a desired position. That is, the opening and closing of the lid 5 at a desired position can be achieved by using a coil spring 57A having a predetermined spring force. In the curve of FIG. 19, the horizontal axis indicates the angle of the lid open / close state, and the vertical axis indicates the moment (Nmm). Select a spring body having a moment of curve X ₁ to the coil spring 57A, the center of gravity moment of the lid 5 is referred to as being the curve X _2, opening and closing moments of the total moment, namely the lid 5 is a curve X _12. From these curves X ₁ , X ₂ and X ₁₂ , when the lid 5 is in the closed state, that is, when the angle is zero, a negative force acts, and the lid is kept closed. When the lid 5 is opened at a predetermined angle from the closed position, for example, an angle of 20 ° to 70 °, the lid 5 is held in this state in a stable state. When the lid 5 is further opened by 70 ° or more, this open state is also maintained in a stable state.

The hinge mechanism 54 has the following features. The lid 5 and the main body container 2 are connected by a hinge mechanism 54. That is, the main body frame assembly 20 and the lid frame assembly 50 are connected by the hinge mechanism 54. Pair of bearing frame 55 is in the state of FIG. 18, has a length A2 of the length A1 and a frame mounting portion 55b ₂ of the upper shaft attachment portion 55b ₁ and a lower bent portion 55c. Each length A1 and A2 is A1 longer than A2 by several times (for example, 5 times). The bearing frame 55, the shaft attachment portion 55b ₁ of the upper is coupled to the parallel frame 51 of the lid frame F1 by a rotary shaft 58, the frame attachment portion 55b ₂ is positioned slightly downward from the shaft attachment portion 55b ₁ of the upper frame It is fixed to the cover 24. The lid frame assembly 50, that is, the lid 5 is opened and closed with the rotation shaft 58 as a support shaft. During this opening and closing, have become lid large, because its weight is heavy but a large load applied to the shaft mounting portion 55b ₁ and a frame mounting portion 55b ₂ of the bearing frame 55, the bearing frame 55 is its length A1, because A2 has become A1> A2, work is leverage, it is possible to withstand the loads in even small force subjected to any large load such as a frame mounting portion 55b _2. That is, the connection between the bent portion 55c and the intermediate frame 23 can be fixed with a small force. In addition, during rice cooking, a large opening force acts to lift and open the lid 5 upward due to the pressure in the pan 3, and a large load is applied to the hinge mechanism 54. However, since the main body container 2 and the lid 5 are connected by the hinge mechanism 54 described above, it is possible to withstand this load by using the same lever action. Furthermore, since the lid 5 is pivotally supported on the rotary shaft 58, the lid 5 is pivotally supported when the internal pressure in the pan 3 abnormally rises during rice cooking and a high pressure is applied to the lid 5. rotation shaft 58 is lifted upward along the long holes 55 _2, a gap is vacant between the pot 3, abnormal pressure from the gap is discharged to the outside, safety is guaranteed. Further, the hinge mechanism 54 can smoothly open and close the lid body by selecting the spring force of the coil spring 57A, and can stop the lid body at a desired position and maintain this state.

  The rotating shaft 58 and the connecting end portion 57b of the spring compression rod 57B at the end of the parallel frame 51 are slightly displaced in the vertical direction in the horizontal direction as shown in FIGS. A predetermined angle θ is formed between a horizontal line that passes through the rotation axis and a line that connects the rotation axis 58 and the connecting end portion 57b with 58 as a center. Note that an opening force that opens the lid 5 is applied to the connecting end portion 57b by the spring mechanism 57. This angle is an initial angle set when the rotating shaft and the connecting end are fixed. In this embodiment, the initial angle is set to 45 °, but when this initial angle is changed, the total moment of the lid changes as shown in FIG. When the initial angle is set to 30 °, for example, the total moment curve becomes Xa. From this total moment curve, the lid body has a small closing force acting on the lid body 5 when the opening angle is 0 ° to 20 °, and on the other hand, when the opening angle exceeds 20 °, the closing force increases. When the initial angle is 50 °, the total moment curve becomes Xb, and when the lid opening angle is 0 ° to 20 °, the closing force acting on the lid 5 is large, while it is larger than 20 °. Then, this occlusion force becomes small. Therefore, by changing the initial angle, the closing force of the lid can be adjusted, and the lid can be kept open at an arbitrary angle.

(Cover lock mechanism)
The lid lock mechanism will be described mainly with reference to FIGS. 12, 13, 25, 26, and 38 to 40. FIG. 25 is an enlarged view of the lid portion of FIG. 13, FIG. 26 is an enlarged view of the lid portion of FIG. 25 from a different angle, FIG. 38 is a perspective view of the lid lock mechanism of FIG. 38 is a partial sectional view of the lid locking mechanism of FIG. 38, and FIG. 40 is an exploded perspective view of the lid locking mechanism of FIG.

  As shown in FIG. 12, the lid locking mechanism 70 includes a lid locking mechanism 71 that locks the lid 5 to the main body container 2 and a pan locking mechanism 87 that holds and locks the lid 5 to the pan 3. .

(Lid lock mechanism)
As shown in FIGS. 38 to 40, the lid lock mechanism 71 locks the frame cover 24 and locks the lid lock / release mechanism 71A capable of releasing the lock and the rotation of the lock operation lever 68 of the pan lock mechanism 87. And a lock lever locking mechanism 71B for locking, and these mechanisms are provided on the opposite side of the hinge mechanism 54.

As shown in FIG. 40, the lid lock / release mechanism 71A includes a release button 72a at one end, a connecting portion 72b to which the locking frame body 77 is connected at the other end, and an intermediate portion 72c that connects both ends. a, the shaft hole 72 ₁ pivot shaft 74 to the intermediate portion is inserted is provided, becomes the pivot shaft 74 from the pivot frame 72 of a relatively long swingable with the support shaft, It is formed of a synthetic resin molding. The intermediate portion 72c, along with the shaft hole 72 ₁ pivot shaft 74 is inserted is provided, the guide portion 72d is provided between the shaft hole ₇₂₁ and the release button 72a. Guide portion 72d from the intermediate portion 72c to the locking member 80 substantially towards the horizontal with a predetermined spacing a pair of arm portions projecting a predetermined length, the guide groove 72 ₂ is formed on the facing surfaces of the arms Has been. A lock frame 73 is slidably mounted on the guide portion 72d. The locking frame 73 has a pair of locking pieces 73a opposed inserted into opposed guide grooves 72 _2, and a connecting portion 73b which connects the end portions of these locking pieces, the pair It is made of a frame having a gap at the other end of the lock piece 73a, and is formed of a metal or a synthetic resin material. A pair of locking pieces 73a can be enlarged area of vicinity of the connecting portion 73b, in this enlarged portion in the state shown in FIG. 40, the long holes 73 ₁ extending in the vertical direction is formed. These long holes 73 _1, the connecting pin 75 ₁ is mounted movably fixed to one end portion of the first link lever 75. Moreover, this lock frame 73 has a lock protrusion 73c at the tip of each lock piece 73a. The lock frame 73 and the pivot shaft 74 are connected by a pair of first link levers 75. These first link levers have the same shape. That is, the first link lever 75 includes a pin fixing portion 75a of the connecting pin 75 ₁ connected to the long hole 73 ₁ of the locking piece portion 73a at one end is fixed, the pivot shaft 74 at the other end And a hooking projection 75c is provided on the shaft fixing portion. A second link lever 76 is connected to the hooking protrusion 75c. The second link lever 76 has a hook portion 76a that hooks on each hook projection 75c of the pair of first link levers 75 at one end portion, and a fixing portion that is fixed to the locking frame body 77 at the other end portion. 76b. Kakaritomewakutai 77 includes a fixed portion 77a fixed to the second link lever 76 of the pair at one end, and a hook portion 77b that is engaged with the locking claws 25 ₁ of the main body container 2 at the other end, It consists of a frame having a space 77c in which a coiled spring is housed, and is formed of a metal plate material or a synthetic resin molded body having high mechanical strength.

As shown in FIGS. 38 to 40, the lid lock / release mechanism 71A is fixed to the outer peripheral wall of the upper lid 5B using a pivot shaft 74 or the like. In the lid lock / release mechanism 71A, first, the extension spring 79b and the fixing portion 77a of the locking frame body 77 are inserted into the gap of the connecting portion 72b of the swinging frame body 72 so that the extension spring 79b is extended. The fixing portion 76b of the second link lever 76 is screwed to the fixing portion 77a. By this fixing, the locking frame 77 is pushed down in the state shown in FIG. 39 by the extension force of the extension spring 79b. The extension spring 79b has a spring force that is compressed in conjunction with an increase in the pressure in the pan. The locking frame body 77 is moved up and down in the gap of the connecting portion 72b of the swinging frame body 72 against the extension force of the extension spring 79b. The swing frame 72 by inserting the guide portion 72d of the guide groove 72 ₂ on the locking frame 73, whereas, the locking pin 75 ₁ is fixed to the pin fixing portion 75a of the first link lever 75 of the pair Te, swing frame 72 is assembled by inserting the locking pin 75 ₁ in the long hole 73 ₁ of the locking frame 73.

Then, the assembled rocking frame 72 via a link fixed frame 78, the swing frame 72 by inserting the pivot shaft 74 to the shaft hole 72 ₁ is fixed swingably lid 5B. A spring frame 79a is wound around the pivot shaft 74 so that the release button 72a of the swing frame 72 is separated from the lid, and a locking frame 77 coupled to the swing frame 72 is a main body container. It is urged to approach the 2 side.

Lock lever locking mechanism 71B, as shown in FIG. 38, FIG. 39, a locking member 80 having a first Kusarijoana 81 ₁ of a pair are aligned with Kusarijoana 81 ₁ of the first and a locking plate 84 having a second Kusarijoana 84 ₁ pair. The locking member 80 is composed of a substantially U-shaped frame having an elongated bottom portion 81a and a pair of side portions 81b that are erected at a predetermined height from both longitudinal edges of the bottom portion and face each other. It is formed by bending a plate material. The locking member 80 consisting of U-shaped frame, a part of both sides tip of each side edge portion 81b through holes 81 _2, 81 ₃ and the other end of the one end is bent at a right angle outwardly, these first Kusarijoana 81 ₁ the bent portion 81c of the vertically long is formed. The locking member 80 is rotatably fixed to the parallel frame 51 with the rotation shafts inserted through the insertion holes 81 ₂ and 81 ₃ , respectively.

Locking plate 84 is made of a strip 84a having a predetermined width dimension and length, a portion of one end is bent at right angles, the second Kusarijoana 84 ₁ is formed in the bent portion 84b ing. This locking plate member 84 is fixed to the surface of the upper lid 5B.

According to the lid lock mechanism 71, when the pot 3 is accommodated in the main body container 2 and these openings are closed by the lid body 5, the collar portion 77 b of the lid lock / release mechanism 71 </ b> A engages the main body container 2. It is locking lock the pawl 25 _1. In this state, the lock lever locking mechanism 71B is inoperative, that is, the locking projection 73c of the locking frame 73 is in the guide portion 72d. Therefore, in this state, the lid 5 is locked to the main body container 2 by the lid lock / release mechanism 71A, but the lid 5 can be freely opened by pressing the release button 72a. Further, the operation of the lock operation lever 68, that is, the holding claws 88 b and 88 b ′ of the pan lock mechanism 87 can be freely moved and returned to the flange portion 3 d of the pan 3. When rice cooking is started and the pressure in the pan 3 rises, the entire lid 5 is lifted upward by this pressure rise. That is, since there is a gap between the holding claws 88b, 88b ′ and the flange portion 3d, the lid 5 is pushed upward (lifted) by this gap. When the lid body 5 is lifted upward, the swinging frame body 72 is also moved upward, and by this movement, the locking frame body 77 is pulled into the connecting portion 72b against the extension force of the extension spring 79b. The pull Simultaneously, the locking pin 75 ₁ of the first link lever 75 moves the elongated hole 73 in _one of the locking frame 73 downward, locking protrusion 73c of the locking frame 73 guide portion 72d Protrude from. At this time, the locking lever locking mechanism 71B, since the pot the locking mechanism 87 is in operation, the second Kusarijoana 84 ₁ of the first Kusarijoana 81 ₁ and locking plate 84 of the locking member 80 Are matched. The lock projection 73c of the lock frame 73 enters the matched first and second lock holes 81 ₁ , 84 ₁ , whereby the operation movement of the lock operation lever 68 is locked. The lock lever locking mechanism 71B adjusts the spring force of the extension spring 79b so that when the pressure in the pan 3 is increased to a predetermined set value, for example, 1.05 atm or more, the locking protrusion 73c is 1. The second locking holes 81 ₁ and 84 ₁ are entered and locked. By setting this set value with the extension spring 79b, the lid can be locked with an arbitrary pressure in the pan to ensure safety.

(Pan lock mechanism)
The pan locking mechanism will be described with reference to FIGS. 11 to 13 and FIGS. 25 to 30.

  As shown in FIGS. 11 and 30, the pan lock mechanism 87 includes first to third hold mechanisms 88 </ b> A to 88 </ b> C that are provided at three positions on the end of the lid frame assembly 50 in a distributed manner. The hold mechanisms 88A to 88C hold the flange portion 3d of the pan 3 by the operation of the lock operation lever 68 at the start of rice cooking. Of these hold mechanisms 88A to 88C, the first hold mechanism 88A is on the lid lock mechanism 71 side of the lid frame F1, and the other second and third hold mechanisms 88B and 88C are both ends of the lid frame F2. Provided in the department. These hold mechanisms 88A to 88C are not provided on the hinge mechanism 54 side. This hinge mechanism part works as a safety device for releasing the abnormal pressure when the pressure in the pan abnormally rises. This pan lock mechanism 87 is a mechanism that holds and locks the flange portion 3d when the pressure in the pan 3 rises. By the operation of the lock operation lever 68, the pressure in the pan does not rise. The state before the hold can be canceled.

  The first to third hold mechanisms 88A to 88C are the same mechanism. One hold mechanism will be described.

  This hold mechanism has a configuration in which an operating member 88 having a pair of hold claws 88b and 88b ′ is rotatably fixed to both ends of the pair of parallel frames 51 (or 52).

  As shown in FIG. 27, the actuating member 88 has a pair of holding claws 88b and 88b 'facing each other at a predetermined interval, and a connecting bar 88c for connecting these holding claws, and has a high mechanical strength. It is made of a metal material. This hold claw is expressed as a hook in FIG. Each of the holding claws 88b and 88b 'is formed by bending a substantially T-shaped plate at both ends of the connecting bar 88c. That is, it is formed by a pair of ear pieces 88a and 88a ′ bent in the same direction at the short side of the substantially T-shaped plate-like body and hold claws 88b and 88b ′ bent at the long side. Each hold claw 88b, 88b 'is bent at a substantially right angle in a direction to hold the flange portion 3d of the pan 3, and a gap G (see FIG. 26) is formed between each claw piece. This gap G is such that a predetermined gap (for example, 1.5 mm) is provided between each holding claw 88b, 88b ′ and the flange portion 3d of the pan 3 in a state where the main body container 2 is closed by the lid body 5. It has become. Due to this gap G, when the lock operation lever 68 is operated, the plurality of hold claws 88b, 88b ′ are moved to the engaging portion of the flange portion 3d of the pan 3 with a margin, so that the operation of the lock operation lever 68 is smooth. Become. And when the pressure in the pan 3 is not increased, this gap is maintained, and when the pressure in the pan 3 rises and the lid 5 is lifted upward by this pressure rise, this gap is shortened. Then, the flange portion 3d of the pan 3 is locked, that is, held by the hold claws 88b and 88b ′.

  The actuating member 88 performs an important function for locking the pan 3. Hereinafter, additional description of this operation member will be given.

  The actuating member 88 is provided with extending portions 88e and 88e 'in which one end edge of the connecting bar is extended to a predetermined length at both ends of the connecting bar 88c, and ear pieces are provided on the extending portions 88e and 88e', respectively. Portions 88a and 88a ′ and hold claws 88b and 88b ′ are formed. An intermediate length L of both the holding claws between the holding claws 88b and 88b ′ is, for example, 143.4 mm.

A pair of holding claws 88b, 88b 'is are substantially the same structure, and when the claw piece 88b ₃ respectively for holding the flange portion 3d of the pot 3, along the curved portion of the outer peripheral edge of the flange holding To face each other. That is, as shown in FIGS. 4 and 28, the pair of holding claws 88 b and 88 b ′ face each other so that their orientations grip the flange portion. Since both the holding claws 88b and 88b 'have the same structure and different directions, one holding claw 88b will be described with reference to the other holding claw 88b'.

Hold claw 88b is in the state shown in FIG. 27, the connecting bar 88c from the end edge extending from the edge and the extended portion 88b ₁ by a predetermined angle θ4 inclined downward, suspended piece portion 88b depending from the extension downwardly ₂ and claw pieces 88b ₃ bent substantially at right angles to the inside of the main body container 2, that is, the flange portion 3d side of the pan 3 from the hanging piece portion. When the extension portion 88b ₁ is inclined at a predetermined angle, the mechanical strength of this portion is increased and the length of the hanging piece portion can be shortened. The extending portion 88b ₁ has slightly different hanging lengths on the outermost side and the inner side of the connecting bar 88c. Due to this difference, the extending portion 88b ₁ has a triangular shape having an angle θ4, and the end of the elongated connecting bar 88c. The part has an enlarged area. As the area increases, the mechanical strength increases. The hanging piece 88b ₂ has a predetermined width and is hung from the end edge of the extension 88b _1. The hanging length is slightly different between the outermost part and the inner part. When the third flange portion 3d is held, the flange portion 3d is brought into contact with the curved portion on the outer peripheral edge of the flange portion 3d.

The claw piece 88b ₃ is locked to the flange portion 3d of the pan, and is bent at a substantially right angle by a predetermined length from the hanging piece portion 88b ₂ to the flange portion 3d side. This claw piece 88b ₃ has an elongated rectangular shape, and as shown in FIG. 28, the entire rectangular surface comes into contact with and is locked with the flange portion 3d of the pan. The dimensions of the hold claws 88b are, for example, a drooping length of 19.0 mm, a longitudinal width of 29.0 mm, and a claw piece bent length of 8.5 mm. The hold claws 88b are formed by punching and bending a metal plate of 3.0 mm, for example. The other hold claw 88b 'has the same structure as the hold claw 88b.

When the pressure in the pan rises during rice cooking, the actuating member 88 is subjected to a large stress and load on the pair of holding claws 88b and 88b 'facing each other with a predetermined interval, and several members can withstand this load. Has been devised. One of the ideas is that hanging length of the hanging piece 88b ₂ of the hold claw are the short length. The suspended piece portion 88b ₂ is adapted to short length in relation to the top cover 5B. That is, in this embodiment, the thickness of the upper lid 5B is partially reduced, and the length of the hanging piece is shortened.

As shown in FIG. 3, the upper lid 5B has an inner lid mounting area 5B _{1 in} which the inner lid 5A is mounted from a central portion to a predetermined area outward, and an outer peripheral portion thereof to a flange portion 3d of the pan. and it has a contact region 5B ₂ that contacts. The contact region 5B ₂ has a flat flat portion 5a that faces the flange portion 3d, and a raised portion 5b that protrudes from the flat portion at a predetermined height and width and has a flat top, and this raised portion 5b. Is divided into three places, and these ridges 5b _{1 to} 5b ₃ are provided corresponding to the first to third hold mechanisms 88A to 88C, and between these ridges 5b _{1 to} 5b ₃ and it has a flat portion _5a 1 _{~5a 3.}

The three raised portions 5b _{1 to} 5b ₃ are formed with through holes 5c having openings of a predetermined size through which the hold claws 88b and 88b ′ of the first to third hold mechanisms 88A to 88C are inserted. Yes.

The three raised portions 5b _{1 to} 5b ₃ are raised downward from the reference flat surface by a predetermined height (for example, 2.5 mm), that is, toward the main body container, with reference to the flat surface of the flat portion 5a. accommodating the pan 3 within the top portion of each ridge 5b ₁ ~5b ₃ when closed by the lid 5 is abutted flange portion 3d of the pot. At this time, the reference flat surface of the flat portion 5a is not in contact with the flange portion 3d and has a gap corresponding to the height of the raised portion. In addition, even if this clearance gap exists, there is no trouble in cooking rice, and it closes by the pressure rise in the pan at the time of cooking, and also functions as a safety mechanism. The three raised portions 5b _{1 to} 5b ₃ are formed at locations apart from the hinge mechanism 54, and the flat portions 5a ₃ between the _two raised portions 5b ₂ and 5b ₃ sandwiching the hinge mechanism 54 are the other. It is wider than the part. When the pressure in the pan rises abnormally, the internal abnormal pressure is ejected from this wide flat portion. In addition, since an operation part exists in front of a rice cooker, even if a pressure is ejected from this part, there is no problem in safety.

The three raised portions 5b _{1 to} 5b ₃ have the same structure. One raised portion will be described. As shown in FIG. 29, the raised portion 5b protrudes downward from the reference flat surface of the flat portion 5a by a predetermined height, but the vicinity of the through-hole 5c through which the hold claw 88b is inserted is located on the flat portion 5a. Instead of extending the reference flat surface as it is, a notch shape is formed, and the inside of the raised portion is recessed through a predetermined step 5d, and a through hole 5c is formed in the recessed portion 5e. By recessing from the inside to the reference flat surface of the raised portion, the hold claw 88b, the extension portions 88b ₁ which is inclined is rotated to face the recess portion. As a result, the hanging length of the hanging piece 88b ₂ of the hold claw 88b to short length. In addition, if the extension part is not inclined, the length of the drooping piece part becomes long. Therefore, when a large stress (load) is applied, it is easily plastically deformed and the function may be lost.

  In addition to this, in relation to the rotation shaft 89a that rotatably fixes the actuating member 88 to the parallel frame 51 (or 52) of the lid frame assembly 50, the first of the pair of ear pieces 88a and 88a ′ is used. The insertion hole is devised. Hereinafter, this device will be described.

The pair of ear pieces 88a and 88a 'are provided to face each other with a slight width interval from the connecting portion of the parallel frame 51 (or 52), and the rotating shaft 89a is inserted into the outer ear piece 88a. first insertion holes 88 1 that _is, the second insertion hole 88 ₂ is the mounting shaft 89b of the first insertion hole 88 ₁ and the arm bar 65 is connected is inserted is formed on the inside of the ears 88a ' ing. The connecting bar 88c is provided with a protruding piece 88d at a substantially central portion thereof. The protruding piece 88d abuts on the end 65c of the arm bar 65. The protruding parts 88d are provided threaded holes 88 _3, by mounting the adjustment screw in the screw hole, so that the can be adjusted contact of the end portion 65c of the arm bar 65.

A pair of ears 88a, insertion holes 88 ₁ each of the first of the 88a ', when the rotation shaft 89a is inserted into the insertion holes 88 _1, as shown in FIG. 28, the rotary shaft 89a is rectangular It is formed at a position located substantially directly above the diagonal line of the claw piece 88b ₃ of. When the rotating shaft 89a is located substantially immediately above the diagonal line of each pawl pieces 88b _3, each claw piece 88b ₃ which is engaged with the flange portion 3d of the pot, the distance between the rotary shaft 89a becomes the shortest distance, yet Since each claw piece 88b ₃ is supported by the portion directly above the diagonal line by the rotating shaft 89a, the entire rectangular claw piece 88b ₃ is in contact with the flange portion 3d and supported by the part directly above the diagonal line. because, a claw piece 88b _3, is well supported equilibrium balance in part b. The rotary shaft 89a is because it is linked to a rigid parallel frames 51 (or 52), each claw piece 88b ₃ is the frame, will be firmly supported.

  In this operating member 88, the pair of opposing holding claws 88b and 88b 'are separated from each other by a predetermined distance to contact and hold the flange portion 3d of the pan. Can do. Further, since the pair of hold claws 88b and 88b 'are dispersed, the weight is reduced and the operation with the lock mechanism using the disc-shaped cam plate is facilitated. Further, since the two hold claws 88b and 88b 'are operated by one arm bar from the disk-shaped cam plate, the number of parts for operating the hold claws from the disk-shaped cam plate is reduced.

Mounting of the actuating member 88, as shown in FIG. 26, the actuating member 88 both parallel frame 51 (or 52) the lugs portion 88a in the connecting portions at both ends, the combined 88a ', the first insertion hole 88 ₁ The rotating shaft 89a is inserted and rotatably mounted between both parallel frames. Each ears 88a, 88a 'is inserted through the second insertion hole 88 ₂ in the mounting shaft 89b, to fix the connection portion of the arm bar 65 to the mounting shaft. The mounting shaft 89b is preferably a rod-shaped body formed of an elastic body that can absorb elastic force. By the mounting shaft 89b in the elastic body, it can prevent damage to the locking pin 65 ₁ without excessive load is applied to the locking pin. That is, by operating the locking lever 68 rotates the disc-shaped cam plate 63, the arm bar 65 actuates the actuating member 88 linearly moves through the locking pin 65 _1. At this time, the mounting shaft 89b is a large load applied to the locking pin 65 ₁ If it is rigid, when the mounting shaft 89b is an elastic body, can absorb the overload.

  The three first to third hold mechanisms 88A to 88C have the above-described configuration, and the flange portion 3d of the pan 3 is held by these hold mechanisms. That is, among these hold mechanisms, the first hold mechanism 88A is on the lid lock mechanism 71 side of the lid frame F1, and the other second and third hold mechanisms 88B and 88C are on both ends of the lid frame F2. Since the flange portion 3d of the pan 3 is provided and held, the annular flange portion 3d is held in a balanced manner by the six hold claws as a pair of the hold claws 88b and 88b ′. A pair of holding claws 88b and 88b 'are fixed to both ends of the operating member 88, and the operating member 88 is fixed to the parallel frame 51 (or 52) so as to be close to or intersect with the circumference of the flange portion. Therefore, the flange part 3d of the pan 3 is reliably held in a stable state. The pair of holding claws 88b and 88b ′ and the rotating shaft 89a cross the periphery of the flange 3d of the pan 3 diagonally on the periphery in a plan view (when viewed through the top and the like). That is, these holding claws 88b, 88b 'are on the back side of the flange portion 3d and are in positions to hold the flange portion, and the rotating shaft 89a is on the upper surface side of the flange portion 3d. It is in a position that intersects the periphery of the flange.

  As a result, as shown in FIG. 30, the pan 3 has a pair of holding claws 88b and 88b 'whose annular flange portions 3d face each other with a predetermined interval, and an operating member 88 that connects these holding claws. Therefore, it is held in a balanced and stable state. That is, it is natural that the hold claws are in a position where they are hooked on the flange portion. However, since these hold claws are also hooked in a crossed state on the flange portion, the amount of the hook is increased, and the rotating shaft is also flanged. Since it will be in the state crossed to the part, a hold nail | claw can be held in a stable state. If the hold claw and the support rotation shaft cross only a part or a part away from the flange portion, the distance from the hold claw becomes long, and the moving distance to the hold position becomes long and becomes unstable. In addition, in the prior art, there is a wide holding so that the holding claw is widely applied to the outer periphery of the flange portion. However, if the holding claw is wide, the holding claw becomes large and its weight increases, and a disc-shaped cam plate is used. The lock mechanism cannot be operated, and another lock mechanism is required. Compared to this mechanism, the above-described hold mechanism is simple in structure and light in weight, and can hold stably. Therefore, the pan can be held in a balanced and stable state by the three first to third hold mechanisms 88A to 88C having such a configuration.

The hold mechanism 88B is connected to the disc-shaped cam plate 63 via the arm bar 65 as shown in FIGS. 24 to 26. With this connection, the arm bar 65 shifts in the longitudinal direction of the mounting shaft 89b to hold the hold mechanism 88B. The mechanism may not operate smoothly. In order to prevent this shift movement, a positioning sleeve 89b ₁ (see FIG. 26) is mounted on the mounting shaft 89b. Although the positioning sleeve 89b ₁ is provided, a positioning groove may be provided on the connecting shaft 89b. Arm bar 65 is fixed by the bolt screw into the long hole 65 ₃ is parallel frame 51 at one end and the other end portion is positioned and fixed to the connecting shaft 89b, to be capable of smooth linear movement without the arm bar 65 is vibration lateral Become.

  These hold mechanisms 88 </ b> A to 88 </ b> C are connected to the disc-shaped cam plate 63 via the arm bars 65, respectively. In the state where the lid 5 is opened, as shown in FIG. 3, each claw piece of the hold claw of the hold mechanisms 88 </ b> A to 88 </ b> C is directed toward the outer periphery of the lid 5 so that the flange 3 d of the pan 3 is ready to hold. It is in a state. From this state, when the pan 3 is accommodated in the main body container 2, the opening of the main body container 2 and the pan 3 is closed by the lid 5, and the lock operation lever 68 is rotated by a predetermined angle, the lock operation lever 68. The disc-shaped cam plate 63 is rotated in a predetermined direction through a rotating ring 66 connected to the. By the rotation of the disc-shaped cam plate 63, the claw pieces of the holding claws 88b and 88b ′ of the holding mechanisms 88A to 88C are moved to the holding position of the flange portion 3d of the pan 3 through the arm bar 65.

According to this lid lock mechanism, the pan 3 is hold-locked from the three sides by the first to third hold mechanisms 88A to 88C by the pan lock mechanism 87, so that the pan 3 is hold-locked in a balanced manner, the hook portion 77b of the lid lock releasing mechanism 71A is made to be able to take over some of the load applied to the locking pawl 25 ₁ of the frame cover 24. That is, the lid lock mechanism 70 locks the lid 5 with a lid lock mechanism 71 that locks the lid 5 to the main body container 2 and a pot lock mechanism 87 that locks the lid 5 to the pot 3. 5 is because the flange portion 3d of the pan 3 is hold-locked in a balanced manner from three directions by the first to third hold mechanisms 88A to 88C at the three locations by the pan lock mechanism 87 when the pressure in the pan increases during cooking. the load applied to the locking pawl 25 ₁ of the frame cover 24 is not increased. As a result, it is not necessary to make the lid lock mechanism 71 strong. Since the lid 5 is double-locked by the lid locking mechanism 71 and the pan locking mechanism 87, the lid 5 will not be opened unexpectedly even if the internal pressure rises during rice cooking.

(Internal pressure adjusting device)
The internal pressure adjusting device will be described with reference to FIGS. 34 is an enlarged sectional view of the lid portion of FIG. 6 as seen from another angle, FIG. 35 is a perspective view showing the pressure valve of FIG. 34, FIG. 36 shows the valve seat of FIG. 35, and FIG. FIG. 36B is an enlarged perspective view, FIG. 36B is a sectional view taken along line XXXVIB-XXXVIB in FIG. 36A, and FIG. 37 is an explanatory diagram for opening and closing the valve port of the valve seat in FIG.

As shown in FIG. 8, the lid 5 is provided with two sets of internal pressure adjusting devices 90 </ b> A and 90 </ b> B.

  These internal pressure adjusting devices 90A and 90B each have a pressure valve 91 and a valve opening mechanism 94 for forcibly opening the pressure valve, and each pressure valve 91 has a disk-shaped base as shown in FIG. This base is fixed to the inner lid 5A. Two safety valves SV are fixed to the base 91p. The valve ports of the pressure valve 91 and the safety valve SV are in communication with the inside of the main body container 2 by providing through holes at locations corresponding to the respective valve ports in the inner lid 5A. As shown in FIG. 8, the internal pressure adjusting devices 90 </ b> A and 90 </ b> B are disposed to face the lid 5 and have the same configuration. One internal pressure adjusting device 90A will be described with reference to the other internal pressure adjusting device 90B.

As shown in FIGS. 8, 34 and 35, the internal pressure adjusting device 90A has a pressure valve 91 and a valve opening mechanism 94 for forcibly opening the pressure valve. The pressure valve 91 is fixed to the surface of the inner lid 5A, and the valve opening mechanism 94 is fixed to the upper surface of the upper lid 5B. The pressure valve 91 is regulated with a valve seat 92 having a through hole 92d having a valve port 92 ₁ of a predetermined diameter, the pressure regulating balls 93 to close the valve port 92 _1, and accommodates the pressure regulation ball 93 this movement Cover body 91c (see FIG. 32). The cover body 91c is adjusted notched opening 91 ₁ back into a predetermined size to cover the pressure ball 93 is formed. It notched opening 91 _1, by the movement of the plunger 96 of the valve opening mechanism 94, pressure regulating balls 93 are sized to push. Pressure regulating balls 93 are sized to close the valve port 92 ₁ (diameter e.g. 30.1625Mm) with a predetermined weight (e.g., 113 g) has been formed by metal balls. The prior art ball has a diameter of 20 mm and a weight of less than 113 g.

  As shown in FIG. 36, the valve seat 92 has a circular bottom wall surface 92a having a predetermined area, a side wall surface 92b erected at a predetermined height from the outer periphery of the bottom wall surface, and an upper side of the side wall surface. In addition, it is made of a disk-shaped body having a predetermined thickness having an upper wall surface 92c opposite to the bottom wall surface, and is formed of a resin molded body having heat resistance.

In the valve seat 92, the upper wall surface 92c is a mounting surface on which the pressure adjusting ball 93 is mounted. The valve seat 92 is formed with a circular through hole 92d penetrating the valve body at the center thereof. Through holes 92d has a circular opening in the upper wall surface 92c and the bottom wall, the opening 92 ₁ of the upper wall surface is smaller than the diameter of a diameter of the pressure regulating balls 93, opening 92 ₁ in the pressure regulating ball Is a circular valve opening (diameter 9.2 mm). The upper wall surface 92c has a hole dent became the valve port 92 ₁ of the easy rolling a pressure regulating ball 93 peripheral. The opening of the bottom wall surface is slightly larger in diameter than the opening of the upper wall surface 92c.

The valve seat 92, as shown in FIG. 36, on the mounting surface, position and a circular valve opening 92 ₁ having a predetermined diameter in the center, a predetermined direction from the valve port radius (side wall portion) in the direction A first rising inclined surface 92c ₁ raised at an angle α1, a second rising inclined surface 92c ₂ raised from the first inclined surface toward the radius at a predetermined angle, and the second inclined further towards the radial terms is provided a third startup inclined surface 92c ₃ which raised at a predetermined angle [alpha] 2. Each of the first to third rising inclined surfaces has a predetermined width along the radial direction. As shown in FIG. 37, the width of the _first rising inclined surface 92c1 is the distance when the pressure adjusting ball 93 moves 1.0 mm in the horizontal direction in the drawing. The angle α1 is an angle formed by a tangent line when the pressure adjusting ball 93 is in contact with the valve port periphery. The pressure adjusting ball 93 rolls on this angle α1, that is, on the tangent line (see FIG. 36). The angle α2 is set smaller than the angle α1. Since the angle α2 of the _second rising inclined surface 92c2 is set to be smaller than the angle α1 of the first rising inclined surface, a step is generated between the _first and _third rising inclined surfaces 92c ₁ and 92c _3. since easily, and the second inclined surface 92c _2, taken between these inclined surfaces smooth, i.e. a connecting surface for connecting without generating a step. This connecting surface is given a predetermined R. The angles α1 and α2 are set according to the relationship between the diameter of the valve opening and the pressure adjusting ball diameter. In this embodiment, the angle α1 is 17 ° to 18 °, and the angle α2 is 8 °. The angle α1 is a tangential angle.

The valve seat 92 is covered with a cover member 91c, the grooves ₉₂ 11, _{92 12} escape escape Oneba the opening 91 _{in one} direction of the cover body is formed. The relief grooves 92 ₁₁ and 92 ₁₂ function to prevent pressure leaks due to insufficient pressure valve blockage when a trap is accumulated near the valve port 92 ₁ . The escape grooves 92 ₁₁ and 92 ₁₂ are formed in a predetermined shape, for example, a concave groove. The concave groove is provided toward the cover body opening. If it is directed in the other direction, for example, the cover wall, the rice balls will accumulate in the meantime and cannot escape. However, since the rolling surface provided with the escape groove is also the rolling surface of the pressure adjusting ball 93, it is preferable that the rolling surface is provided at a location avoiding the rolling surface. In this embodiment, a rolling surface having a predetermined width is set, and relief grooves are formed at both ends thereof.

  With reference to FIGS. 36 and 37, the closing action of the valve opening by the pressure adjusting ball will be described.

Valve port 92 _1, in a state of being closed by the weight of the pressure regulating balls 93 and the pressure regulating ball is pushed by the pushing force of f1, the first start-up tilt regulating pressure ball against its own weight Pushed up along the surface. That is, since the pressure adjusting ball has a predetermined weight, when the ball is pushed up, a force f2 that tries to roll it down is applied. The pressure adjusting ball is raised and lowered in relation to the forces f1 and f2. In other words, when f1> f2, the pressure adjusting ball climbs the inclined surface and the valve port opens, and when f1 becomes small, the rolling valve port is closed. Therefore, the pressure adjusting ball climbs along the first rising inclined surface that forms a tangent line, that is, f1 and f2 maintain a balance (balance), and when f1 increases, the pressure adjusting ball rolls down when it decreases. The ball rolls without shaking. This rolling is achieved by making the angle of the first inclined surface a tangential angle. If the angle is smaller than this tangential angle, rolling of the pressure adjusting ball starts with a small pressing force. On the other hand, since f2 becomes small, it becomes difficult to return. As a result, the pressure adjusting ball spins around the valve opening so that the valve opening cannot be blocked, and a pressure leak occurs. In particular, when there is only water, the water is blocked without any problem. If the angle α1 is larger than the tangential angle, the pressure adjusting ball closes at a position deviated from the peripheral edge of the valve opening, so that the valve opening is incompletely closed. Further, if all the angles of the first to third inclined surfaces are set to the angle α1 of the first inclined surface, the pressure adjusting ball must be pushed up by the force of f1, so that the spring that pushes the pressure adjusting ball The spring must be made large and have a strong pushing force, and this spring can be made small by reducing the angle α2 of the third inclined surface.

  Since the pressure adjusting ball 93 is operated by the valve opening mechanism 94, the valve opening mechanism can be operated with less energy without increasing the size. That is, when the pressure valve 91 is open, the electromagnetic coil is excited and the plunger 96 is retracted against the extension force of the spring Sp to open the valve opening. In the closed state, the energization of the electromagnetic coil is stopped. Then, due to the extension force of the spring Sp, the plunger 96 protrudes and pushes the pressure adjusting ball 93 to open the pressure valve 91. In this rice cooker, along with the increase in the size of the pan, the internal pressure adjusting device 90A must also be increased in size. In order to increase the size of the internal pressure adjusting device 90A, it is essential to increase the size of the valve port, the size of the ball that closes the large size, and the size of the spring Sp, the size of the solenoid, and the plunger to move the large pressure adjusting ball. become. When these are increased in size, the weight increases, the lid becomes heavier, the amount of heat generation is large, and the surroundings becomes high temperature. However, these problems can be reduced by adopting the above configuration of the pressure valve.

With this configuration, the pressure regulating balls 93 are fitted into the recessed hole in the mounting surface of the valve seat 92, the valve port 92 ₁ closed by the weight of the pressure-regulating ball 93, recessed curvature adjustment of the closed state recess Since the shape of the pressure ball 93 is substantially the same, the pressure ball 93 is fitted into the recess in a stable state. The pressure adjusting ball 93 is slid by the valve opening mechanism 94 so that the valve opening is opened. When the force for sliding the pressure adjusting ball 93 is lost, the pressure adjusting ball 93 is recessed by its own weight. It rolls down along the shape of the hole and again closes the valve opening.

The relationship between both pressure valves 91 will be described. Both the pressure valve 91 is adjusted weighs pressure ball 93 are different the same a valve port 92 ₁ of the bore. That is, the diameters of both pressure valves 91 are set such that φ1> φ2 when one is φ1 and the other is φ2.

  The relationship between the diameter of the pressure valve 91 and the weight of the pressure adjusting ball 93 is an important factor for determining the so-called closing holding force that maintains or holds the internal pressure in the pan 3 at a predetermined value. For example, when the weight of the pressure adjusting ball 93 is the same and the diameter of the pressure valve 91 is changed, the closing holding force is changed. That is, when the diameter of the pressure valve 91 is increased, the blocking retention force is decreased, and conversely, when the diameter of the pressure valve 91 is decreased, the blocking retention force is increased. Further, if the pressure valve 91 is made the same diameter and the weight of the pressure adjusting ball 93 is reduced, the occlusion holding force is lowered. Conversely, if the pressure adjusting ball 93 is increased in weight, the occlusion holding force is increased.

  From this relationship, since the diameters φ1 and φ2 of the pair of pressure valves 91 are φ1> φ2, the closing holding force of both the pressure valves 91 is the closing closing force of one pressure valve 91. Lower than holding power. In this embodiment, the closing holding force of one pressure valve 91 is set to 1.2 atm, and the other pressure valve 91 is set to 1.3 atm. These occlusion holding forces can be set by setting the weight of the pressure adjusting ball 93 to 113 g, for example, one diameter φ1 to 9.2 mm, and the other diameter φ2 to 7.0 to 8.0 mm, for example. The 1.3 atm of the pressure valve 91 is set lower than the opening pressure of the safety valve SV.

  When the closing force of both pressure valves 91 is set to these values, the inside of the pan 3 is maintained at 1.2 atm by the pressure valve 91 having a low closing force. At this time, the other pressure valve 91 has a higher blocking retention force than the pressure valve 91 having a lower blocking retention force, and thus maintains 1.2 atm without any influence. In this state, when the internal pressure in the pan 3 exceeds 1.2 atmospheres and rises abnormally, the pressure valve 91, which is normally set with a low closing holding force, is opened, and this abnormal rise is avoided. Further, even when the pressure is not released due to some cause, for example, a failure, the abnormal pressure rises when the pressure of the other pressure valve 91 exceeds the closing holding force of 1.3 atm, so that it functions as a safety valve. When both pressure valves 91 are not opened, the safety valve SV is activated.

Moreover, both the pressure valves 91 are forcibly opened and closed for one or more times at a substantially the same timing with a low blockage holding force, that is, an internal pressure of 1.2 atm or less during rice cooking. In the opening and closing control, at the time of closing, the closing holding force of one pressure valve 91 is set higher than that of the other pressure valve 91, so the internal pressure in the pan 3 is the blocking set in the one pressure valve 91. The holding force is reliably maintained at 1.2 atm. This internal pressure maintenance is achieved by providing a difference in height between the respective blocking holding forces of both pressure valves 91. For example, if the closing holding forces of the two pressure valves 91 are the same without any difference in height, when both the pressure valves 91 are simultaneously closed after being opened, one of the two pressure valves 91 If the blockage becomes incomplete, a pressure leak occurs from the pressure valve 91, the pressure in the pan 3 cannot be maintained at a predetermined 1.2 atmospheres, and the predetermined pressure cooking cannot be performed. Such incomplete occlusion, the valve port 92 ₁ of one of the pressure valve 91, a portion of the cooking object, for example when the caught like Contact viscosity of flavor components, or both the pressure valve 91 is the same specifications Even if it is manufactured at the same time, if there is a manufacturing error, it may also occur.

  Therefore, in order to eliminate such incomplete blockage and perform predetermined pressure cooking, both pressure valves 91 are provided with a difference in height between the respective blockage holding forces, and a pressure valve having a low blockage holding force. When 91 is closed, the pressure valve 91 having a high closing holding force is surely closed.

  In this embodiment, the closing holding force of one of the pressure valves is 1.2 atm, and that of the other pressure valve is 1.3 atm. This is because it has been confirmed that the above pressure leakage can be avoided if the difference in level of the pressure is 0.1 atm or more. Is more preferably 1.5 atm or more in order to more reliably avoid the pressure leakage. In addition, although two sets of internal pressure adjusting devices are provided, more than one may be provided. In that case, three or more pressure valves have a predetermined closing holding force, that is, a minimum closing holding force. Once set, the remaining pressure valve may be set to a higher occlusion holding force than the minimum occlusion holding force. In this case, the remaining pressure valve may or may not have a height difference. Good. However, when a safety valve is provided, the opening pressure must be set lower than that of the safety valve. Of course, the safety is further improved by providing three or more pressure valves. In this embodiment, the diameter of the pressure valve is changed by making the weight of the pressure adjusting ball the same. However, even if the weight of the pressure adjusting ball is changed by making the diameters φ1 and φ2 of the pressure valve the same. The action is the same.

  The pair of pressure valves 91 are opened and closed by a valve opening mechanism 94, respectively. These valve opening mechanisms 94 are mounted on the upper lid 5B, and the both valve opening mechanisms 94 have the same configuration.

One valve opening mechanism will be described with reference to FIGS. The valve opening mechanism 94 includes a cylinder 95 around which an electromagnetic coil is wound, a plunger 96 that moves the pressure adjusting ball 93 by excitation of the electromagnetic coil, a spring Sp and a push rod 98 that are attached to the tip of the plunger. It consists of The spring Sp is an extension coil spring. The push rod 98 is supported by a sealing member having elasticity. The pressure valve 91 is controlled to be opened by the valve opening mechanism 94. That is, in the normal state, the elongation of the spring Sp, and opens the valve port 92 ₁ of the pressure valve 91 the plunger 96 to push the to pressure regulation ball 93 protrudes. When the electromagnetic coil is excited based on a command from the control device C (see FIG. 41), the plunger 96 is pulled into the cylinder 95 against the extension force of the spring Sp and is adjusted by the push rod 98 so far. there is no pushing force has been pushed a pressure ball 93, pressure regulating balls 93 and slides sideways, the valve port 92 ₁ by the weight of the pressure regulating balls 93 are closed. Also, in this closed state, the excitation of the electromagnetic coil is stopped, the expansion force of the spring Sp again, the plunger 96 protrudes to push the pressure regulating balls 93 to valve port 92 ₁ is open. Similarly, the other valve opening mechanism 94 controls the opening of the pressure valve 91. This control is performed by a command from the control device C.

Further, the internal pressure adjusting device 90A, among 90B, the internal pressure adjusting device 90B of the hinge mechanism 54 side, when the lid 5 is lifted upward, attached to the middle cylinder body 60 pressure control ball 93 rolls from the valve port 92 ₁ It collides with the sealed packing 99. A push rod 98 connected to the cylinder 95 of the valve opening mechanism 94 is fixed to the seal packing 99, and the central portion of the seal packing 99 protrudes toward the pressure adjusting ball 93. In this state, when the lid 5 is repeatedly opened and closed, the pressure adjusting ball 93 collides with the protrusion of the seal packing 99 every time the lid 5 is opened and closed. Steam leaks and causes failure of the parts constituting the internal pressure adjusting device and other parts. Therefore, in order to eliminate this inconvenience, a retracting mechanism 53 is provided for separating the protrusion of the seal packing 99 from the pressure adjusting ball 93 when the lid 5 is lifted upward (see FIG. 15). The retracting mechanism 53 is an arm bar that connects the internal pressure adjusting device 90 </ b> B on the hinge mechanism 54 side and the hinge mechanism 54. One end of this arm bar is coupled to the rear end (the front end is coupled to the push rod 98) of the cylinder 95 of the internal pressure adjusting device 90B, and the other end is coupled to the hinge rotation shaft 58 via the cam member 53a. Yes. The cam member 53a functions to pull the arm bar in conjunction with the hinge mechanism 54, that is, retract the seal packing 99, when the lid 5 is lifted upward.

  In the above, two sets of internal pressure adjusting devices have been described. The pressure valve of this internal pressure adjusting device is a closing valve that closes the valve opening to prevent pressure leakage. Three functions as an agitation valve that stirs abruptly and causes a sudden boiling phenomenon in the pan to stir the cooked rice, and a safety valve that opens when the pressure in the pan abnormally rises and prevents this pressure from rising abnormally. It has become a preparation. Furthermore, if there are three or more internal pressure adjusting devices, the safety will be improved.

The storage tank 100 is common to the two sets of internal pressure adjusting devices 90A and 90B. As shown in FIG. 8, the storage tank 100 is composed of a container having a cylindrical portion 100a that fits into a hollow hole of the middle cylindrical body 60 and a vacant chamber 100d of a predetermined size that temporarily stores a screw. It is formed of a resin molding. The storage tank 100 includes a discharge cylinder 100c that discharges steam discharged through a pair of pressure valves 91, an empty chamber 100d that temporarily stores a portion of the umami component, and steam to the outside. A return valve 100b is provided which has a steam discharge port 100 ₁ (see FIG. 5) for discharging, and returns the stored rice bowl into the pan 3 at the bottom of the empty chamber 100d. When the steam is ejected from each pressure valve 91, the rice cake, which is the umami component, is led out from the pot 3 through the pressure valve 91 together with the steam, and is temporarily stored in the empty chamber 100d of the storage tank 100. Is done. When the rice cake stored in the empty room 100d reaches a predetermined amount, the return valve 100b is opened and returned to the pot 3. In the storage tank 100, the tubular portion 100 a is fitted into the hollow hole of the middle tubular body 60.

  As shown in FIG. 6, the inner lid 5 </ b> A is made of a disk-shaped plate having a size that closes the opening 3 a of the large-sized pan 3, and a pair of pressure valves 91 are provided on the upper surface, that is, on the outer lid side. Is provided. The inner lid 5A has a lid heater H3 on the upper surface thereof, a pan packing which is in contact with the opening 3a of the pan 3 on the outer periphery thereof, and an upper lid 5B which projects outwardly on the outer periphery of the inner lid 5A. A locking member (not shown) that is detachably locked to the fixing means is provided. The pot packing is made of silicone rubber having excellent durability and heat resistance, and is fixed by an annular mounting frame. Further, the inner lid 5A is provided with a safety valve SV for releasing the pressure in the pan 3 to the outside when the pressure in the pan 3 rises to an abnormal pressure. The safety valve is opened at a predetermined opening pressure.

  As shown in FIG. 11, the lid locking mechanism 70 includes a lid locking mechanism 71 that locks the lid 5 to the main body container 2 and a pan locking mechanism 87 that locks the lid 5 to the pan 3. Since it is a locking mechanism, the lid body is not inadvertently opened during cooking, and safety is improved. That is, when the pan 3 is accommodated in the main body container 2 and the pan 3 is locked by the pan lock mechanism 87, the opening operation of the lid lock mechanism 71 becomes invalid. That is, while the pan lock mechanism 87 is locked, the lid 5 is not opened even if the lid lock mechanism 71 is opened.

  The lid lock mechanism 70 locks the container body and the pan with the lid lock mechanism 71 and the pan lock mechanism 87, but forgets to lock with the pan lock mechanism 87, and rice cooking is started with the lock of only the lid lock mechanism 71. Since this is dangerous, a safety device is provided in which rice cooking is not started unless the pan is locked completely by the pan lock mechanism 87. This safety device is provided with a first detection switch for detecting a locked state in three directions and a second detection switch for detecting the rotation of the lock operation lever 68, and all signals from these detection switches are provided. Cooking rice is started when the standard is met.

  A control apparatus and rice cooking by this control apparatus are demonstrated with reference to FIGS. 41 is a block diagram constituting the control device, FIG. 42 is a flowchart showing the rice cooking process, and FIG. 43 is a temperature and pressure curve diagram showing changes in the temperature and pressure in the pan during the rice cooker.

  As shown in FIG. 41, the control device C includes hardware including a CPU, ROM, RAM, etc., a rice cooking amount determination means, a start key, a menu key, a reservation key, and a pan bottom temperature sensor S1. These buttons and sensor signals are connected to the steam temperature sensor S2 and the like, and are input to the CPU. Further, a valve open / close timer, ROM, and RAM are connected to the CPU. Further, a side heater H2, a bottom heater H1, a lid heater H3, internal pressure adjusting devices 90A and 90B, a display panel 30b, a blower FAN, and the like are connected to the output unit (driver). In the ROM, a rice cooking program for each rice cooking menu is stored. As shown in FIG. 42, this rice cooking program includes a white rice / normal course, a brown rice / normal course, a white rice / sushi sushi course, and the like.

  Hereinafter, with reference to FIG. 42 and FIG. 43, rice cooking when “white rice / normal course” is selected by the control device C will be described.

  After putting a predetermined amount of white rice in the pot 3, a predetermined amount of water is added, set in the inner case 4, and the lid 5 is closed. Next, the start key is pressed to display the initial screen on the display panel 30b, and “white rice / normal course” is selected (S101 to S103). Thereby, the control apparatus C performs the water absorption process I (S104) of FIG.

  In this water absorption process I, energization to the bottom heater H1 is turned on and off at predetermined time intervals, the temperature in the pot 3 is set to a predetermined temperature A1, and a predetermined amount of time is taken to absorb a predetermined amount of water into the cooked rice. Let In the water absorption process I, the pressure valves 91 of the internal pressure adjusting devices 90A and 90B are opened. After a predetermined time has elapsed, the process proceeds to the start-up heating process II (S105).

  In the start-up heating process II, the control device C closes the pressure valves 91 by the valve opening mechanisms 94 of the two sets of internal pressure adjusting devices 90A and 90B, and increases the energization rate to the bottom heater H1 and the like. The pan 3 is heated with full power, and the cooked rice is heated up to the boiling temperature A2. In the start-up heating process II, the pressure in the pan 3 is increased from atmospheric pressure to, for example, 1.2 atmospheres. At this time, the controller C determines the amount of rice cooked in the pan by the rice cooking amount determination means based on the detection value from the pan bottom temperature sensor S1. In the start-up heating process II, the inside of the pan 3 is boiled by pressurization heating, and the process proceeds to the next boiling maintenance process III (S106).

  In this boiling maintenance step III, the control device C performs energization to the bottom heater H1 at predetermined time intervals to maintain the boiling state, while the amount of cooked rice is large based on the determination by the rice cooking amount determination means, for example, When the maximum amount of cooked rice or slightly less than this, both pressure valves 91 in the closed state are opened intermittently once or several times at the same time. In addition, when the amount of cooked rice is small, if both pressure valves 91 are opened at the same time, the bumping phenomenon in the pan 3 becomes more intense than when the maximum amount of cooked rice is used, and the rice grain may be damaged. Adjustment is performed by opening one of the pressure valves 91. By opening these pressure valves 91, the pressure in the pan 3 is reduced from 1.2 atm to almost atmospheric pressure. Due to this pressure change, the inside of the pan 3 boils vigorously, so-called bumping phenomenon occurs. The rice in the pan 3 is stirred using this bumping phenomenon. In particular, when both pressure valves 91 are opened in the initial stage of the boiling maintenance process III, the rice is efficiently stirred because there is much water in the pot at this stage. In this boiling maintenance step III, both pressure valves 91 are opened and closed at predetermined time intervals. At the time of closing, the closing holding force of one pressure valve 91 is set higher than that of the other pressure valve 91. Therefore, the internal pressure in the pan 3 is reliably maintained at the closing holding force 1.2 atm set in the one pressure valve 91. Moreover, even if the pressure in the pan 3 rises abnormally, the other pressure valve 91 is opened, so that safety is ensured. This boiling maintenance process III is performed over a predetermined time, and in the latter half of the boiling maintenance process III, the moisture in the pot 3 decreases and the temperature in the pot 3 rises. When this boiling maintenance process III is completed, the process proceeds to a steaming process. In this steaming process, steaming process 1, additional cooking process and steaming process 2 are executed (S107 to S109).

  As mentioned above, the rice cooking which selected the white rice and the normal course was demonstrated, but other rice is cooked in the same way. In particular, when brown rice or germinated brown rice course is selected, if both pressure valves 91 are opened at the same time, brown rice can be removed by bumping phenomenon.

  In this embodiment, the lid locking mechanism is composed of a lid locking mechanism and a pan locking mechanism. However, the lid locking mechanism is omitted, the pan locking mechanism is partially changed, and the changed pan locking mechanism and lid locking mechanism are replaced with each other. You may make it also use. The change of the pan locking mechanism is provided with a new locking claw that locks the main body container, and the locking claw is locked with another locking claw (locked to the pan) with a lock operation lever, and a predetermined timing, that is, Be actuated simultaneously or in stages. As a result, the lid locking mechanism can be locked to the main body container and the pan with a single locking mechanism, thereby reducing the number of parts, improving the operability, and improving the design.

  In the lid locking mechanism according to the embodiment of the present invention, the lid locking mechanism and the pan locking mechanism are configured by mechanical mechanisms, but by adding a safety control device for electrical control to these mechanisms, the safety can be further improved. Is to increase.

  Hereinafter, the safety control device will be described with reference to FIG. FIG. 44 is a control block diagram of the safety control device.

  The safety control device inputs a detection signal from a sensor provided in the lid lock mechanism and the pan lock mechanism and electrically locks the lid body 5.

  The lid 5 has a lid sensor for detecting that the main body container is covered with the lid, and the lock operation lever is opened and closed, that is, the lock operation lever is rotated by a predetermined angle during cooking, The lever sensor that detects the rotation state is provided in the rotation path of the lock operation lever, and the three hold mechanisms of the pan lock mechanism are provided with hook sensors that detect that these mechanisms are operated. Yes. The rice cooking switch is electrically turned on when all the detection signals from the lever sensor and the first to third hook sensors are input.

With reference to FIGS. 45-51, the modification of a pan locking mechanism and a lid locking mechanism is demonstrated. 45 is a plan view of a lid provided with a pot locking mechanism and a lid locking mechanism of a modified example, FIG. 46 is an enlarged perspective view of a part of the lid of FIG. 45, and FIG. 47 is a lid of FIG. 48 is a cross-sectional view of a part of FIG. 45, FIG. 49 is a perspective view of the arm bar of FIG. 45, and FIG. 50 is an exploded perspective view of the lid lock mechanism of FIG. FIG. 51 is a block diagram of a safety control device according to a modification.

  The rice cooker 1 puts a large amount of cooked rice in a large pot, boosts the inside of the pan to atmospheric pressure or more, generates a bumping phenomenon during cooking, and uses the bumping phenomenon to cook the rice in the pot. Since the rice is cooked with stirring, if the product is used incorrectly, the boiled cooked rice may scatter to the outside and become dangerous. For this reason, in this rice cooker, a double-triple safety device is provided. However, depending on the form of use, use and operation unexpected by the manufacturer may occur. As an example, it is common knowledge that a rice cooker must not open the lid during cooking, but the lid opening operation may still be performed by mistake. Therefore, in this rice cooker, even if the lock operation lever is operated during rice cooking, the locked state is maintained and the rice cooker cannot move. Even when this locked state is maintained, the user may suspect a malfunction and may erroneously operate the lock operation lever to attempt to release it. When such an operation is performed, an abnormal force is applied to the transmission mechanism such as the disk-shaped cam plate and the arm bar existing between the lock operation lever and the holding claw, and the components constituting the transmission mechanism are damaged and broken. There is a risk. Therefore, the lid 5D has three holding mechanisms 88A 'to 88C that absorb the rotational force on the way without the rotational force of the lock operation lever being transmitted to the holding claw when such an operation is performed. Is provided. Moreover, the rice cooker provided with this lid 5D has a simplified structure of the lid lock mechanism.

  The pan locking mechanism 87 ′ has three holding mechanisms 88A ′ to 88C ′. These mechanisms 88A ′ to 88C ′ are formed by changing the shape of the arm bar 65 of the hold mechanisms 88A to 88C and providing a spring body between the arm bar and the mounting shaft. Hereinafter, the same reference numerals are given to the common configurations of both the hold mechanisms, and the duplicate description will be omitted, and different configurations will be described. Since the three holding mechanisms 88A ′ to 88C ′ have the same configuration, only one holding mechanism 88A ′ will be described.

As shown in FIGS. 45 and 46, the hold mechanism 88A ′ includes an arm bar 65A and an extendable spring body S. Arm bar 65A, as shown in FIG. 49, a mounting portion 65s for mounting the extension spring member S, the elongated hole 65 ₂₁ to allow moving the arm bar in the longitudinal direction is provided. Elongated hole _{65 21} are respectively formed on the pair of connecting pieces 65b ₁ which constitutes the second coupling part 65b. These long holes _{65 21,} mounting shaft 89b is inserted. The elongated hole _{65 21} has a guide hole. Mounting portion 65s is composed of a cut-and-raised piece 65d which one end of the flat portion of the arm bar 65A has caused predetermined height cutting, a spring mounting hole 65d ₁ provided in the cut-and-raised pieces 65d. An extension spring body S for moving the arm bar 65A outward in the longitudinal direction is suspended between the mounting shaft 89b and the cut and raised piece 65d. The suspension of the stretching spring member S, the inner side of the rotary shaft 89b is elongated hole 65 _21, i.e., is moved to the disk-shaped cam plate 63 side. The long holes _{65 21} of the arm bar 65A, in a stretched spring member S, constitute the absorbing mechanism.

Even if the lock operation lever 68 is rotated while the flange portion 3d of the pan is held by the holding claws 88b and 88b 'by this absorption mechanism, only the lock operation lever is rotated and the hold claws are not released. . That is, when the lock operation lever 68 is rotated, the disk-shaped cam plate 63 is rotated a predetermined angle, but the arm bar 65A is pulled to a disc-shaped cam plate 63 direction, the mounting shaft 89b that is inserted into the elongated hole 65 ₂₁ While moving only within the guide hole of the arm bar, the extension spring body S is not extended, so that it is not transmitted to the holding claws 88b, 88b ′. That is, the release force for releasing the hold state of the hold claws 88b and 88b ′ does not work. Thereby, even if it misoperates, the lock | rock of a pan locking mechanism is not cancelled | released. Of course, since the operation of this lock operation lever is an erroneous operation, rice cooking is continued without going through the scheduled pressurization process, an alarm device is activated and an alarm signal is generated, or rice cooking is stopped, etc. A process change action is taken (see FIG. 51). In addition, it turns out that the block diagram of the safety control apparatus of the modification using the absorption mechanism shown in FIG. 51 is simplified compared with the block diagram of the safety control apparatus shown in FIG.

  Explaining the role of the extension spring body S, the flange portion 3d of the pan and the holding claws 88b, 88b 'are lifted by the pressure when the internal pressure of the pan rises, and the flange portion 3d of the pan and the holding claws 88b, 88b. There will be no gap with 'and it will be completely locked. In this state, since a large force is generated in proportion to the internal pressure of the pan between the flange portion 3d of the pan and the holding claws 88b and 88b ', the arm bar 65A is pulled back and held by the expansion / contraction force of the extension spring body S. The claws 88b and 88b ′ are not released. At this time, the extension spring body S is set to such a strength that the hold claw cannot be released when the internal pressure of the pan is high, for example, 1.05 atm or more. The extension spring body S is set to such a strength that the hold claw is released only when the internal pressure of the pan is lowered to a safe state, for example, about atmospheric pressure.

  In the above description, the three hold mechanisms 88A ′ to 88C ′ have the same configuration and the extension spring body S has the same configuration. However, the present invention is not limited to this, and the hold mechanisms 88A ′ to 88C ′. The spring strengths of the three extension spring bodies S may be different from each other. As an example, the strength of the left and right spring bodies in the hold mechanisms 88B ′ and 88C ′ is set so that the hold claws 88b and 88b ′ are released when the pressure in the pan becomes 1.03 atm or less, for example. Similarly, the strength of one spring body in the hold mechanism 88A ′ is set so that the hold claws 88b and 88b ′ are released when the pressure in the pan becomes 1.02 atm or less, for example. Can do. By doing so, the locking member 80 of the lock lever locking mechanism 711B interlocked with the front holding claws 88b, 88b ′ in the holding mechanism 88A ′ unless the pressure becomes lower can cause the lid locking / releasing mechanism 711A. The release button 72a (see FIG. 50) cannot be pressed by colliding with the stopper piece 72d. Therefore, against the possibility of pressing the handle button that occurs when the lock lever is operated incorrectly, the load load on the lid lock / release mechanism 711A can be reduced, and the durability of the apparatus can be increased. In addition, for example, each hold claw is released from the flange portion 3d of the pan only when the pressure becomes lower than the set pressure, so that all the hold claws may come off until the pressure becomes lower than the safe pressure. It is eliminated and higher safety can be obtained. In addition, the setting of the strength of the spring body can be appropriately changed depending on the size of the rice cooker used.

  As shown in FIGS. 45 to 50, the lid lock mechanism 711 (see FIG. 6) has a lid lock / release mechanism 711 </ b> A that can lock and release the lock on the frame cover 24. A lock lever locking mechanism 711B for locking the rotation of the lever 68 is provided.

  The lid lock / release mechanism 711A has a simplified configuration by omitting the lock frame 73 and a mechanism for moving the lock frame 73 such as the link lever 75 from the lid lock / release mechanism 71A. That is, the lid lock / release mechanism 711A has a configuration in which a stopper piece 72d is provided on a swing frame 72A as shown in FIG. Other configurations, that is, the release button 72a and the locking frame body 77 are the same, and the stopper piece 72d is provided between the release button 72a and the intermediate portion 72c. In the lid lock / release mechanism 711A, the swing frame 72A is fixed to the upper lid 5B, and the lock with the main body container is the same as the lid lock / release mechanism 71A. Further, in a state where the locking frame body 77 of the lid lock / release mechanism 711A is locked to the frame cover 24, the stopper piece 72d collides with the bent portion 81c ′ of the locking member 80 of the lock lever locking mechanism 711B. Then, the operation of the release button 72a is invalidated. Therefore, it is possible to prevent the lid lock / release mechanism from being released due to an erroneous operation.

1 pressure type rice cooker 2 container body 20 the body framework member 21 base plate 22 heater support stand 22A ₁ ～22A ₃ air-flow control means 23 intermediate frame frame 24 frame cover 3 pot (pressure vessel)
3d Flange 4 Inner Case 5 Lid 50 Lid Frame Assembly 54 Hinge Mechanism 57 Spring Mechanism 60 Medium Cylindrical Body 61 Fixed Ring 63 Disk-like Cam Plate 64 Cam Groove 65 Arm Bar 66 Rotating Ring 67 Pressing Ring 68 Lock Operation Lever 69 Lid Cover 70 Lid lock mechanism 71 Lid lock mechanism 71A Lid lock / release mechanism 71B Lock lever lock mechanism 80 Lock member 87, 87 'Pan lock mechanism 88A-88C, 88A'-88C' Hold mechanism 88b, 88b 'Hold claw 90A, 90B Internal pressure adjusting device 91 Pressure valve 92 Valve seat 92 ₁ Valve port 92a Bottom wall surface 93 Pressure adjusting ball 94 Valve opening mechanism 95 Cylinder 96 Plunger 97 Actuating member 100 Large storage tank F1, F2 Lid frame body F12 Frame opening SV Safety valve S1 Pan bottom Temperature sensor

Claims (2)

A main body provided with a bottomed pressure vessel having an opening and having a flange portion extending outward from the periphery of the opening, and a heating means that accommodates the pressure vessel and heats the cooked rice in the pressure vessel A container, a lid that closes and seals the opening of the pressure container and the main body container, and a lid locking mechanism that locks the lid to the pressure container and the main body container,
The lid lock mechanism includes a first lock mechanism that locks the lid to the main body container, and a second lock mechanism that locks the lid to the pressure container,
The second locking mechanism includes a locking portion that is locked to the flange portion of the pressure vessel, and an operation portion that locks the locking portion to the flange portion or releases the locking.
The locking portion has a locking claw and a mounting shaft that rotatably holds the locking claw,
An extension spring body is provided between the mounting shaft of the locking portion and the operation portion,
The rice cooker according to claim 1, wherein the extension spring body has such a strength that the locking claw cannot be released even if the operation portion is operated in a state where the internal pressure of the pressure vessel is high.   The rice cooker according to claim 1, wherein the mounting shaft for rotatably holding the locking claw is formed of an elastic body.