JP4014545B2 - Lid lock structure of pressure rice cooker - Google Patents

Description

  The present invention relates to a pressure-type rice cooker that cooks rice in a high-pressure state, in particular, a lid lock structure capable of opening the lid when the hermeticity is released while maintaining the hermeticity so that the lid does not open at high pressure. It is invention concerning.

  In a pressure rice cooker that can cook rice in a high-pressure state, normal high-pressure cooking cannot be performed if the airtightness is impaired mainly in the high-pressure state during rice cooking, and the lid may be opened carelessly It is dangerous if you can. Therefore, providing the lock mechanism which prevents a cover from opening in the cooking state of rice cooking is performed. For example, as disclosed in Patent Document 1, a high pressure state is realized by closing a valve hole provided in a steam passage with a pressure adjusting ball, and a means for forcibly pushing out the pressure adjusting ball from above the valve hole is provided, By locking the means for forcibly pushing out the pressure adjusting ball and the locking means, a locking means for maintaining airtightness and safety is realized.

In the invention described in Patent Document 1 which is the prior art of the present applicant, the inner surface of the lid is slid by a solenoid with an operating body formed with a protrusion for pushing out a pressure adjusting ball at one end and a lock piece engaged with a hook at the other end. It is driven to move.
In a pressure-type rice cooker, a large force acts on the locked lid by the internal pressure of the pan. Since there is a possibility that the strength of the lid plate or the entire lid molded by the synthetic resin material is insufficient due to this force, a metal lid reinforcing plate is disposed on the inner surface of the lid plate. Therefore, the operating body of the opening device arranged on the inner surface of the lid plate operates with the surface of the metal lid reinforcing plate as the sliding surface.
JP-A-9-140571

  In a pressure rice cooker, a large force is repeatedly applied to the lid at all times by the internal pressure of the pan, and is exposed to a high temperature state. Therefore, there is a possibility that elastic distortion may occur in the lid, and the metal lid reinforcing plate may be deformed by repeated load due to pressure or repeated contraction due to temperature difference. When the reinforcing plate, which is the sliding surface of the operating body, is deformed, the locked state by the operating body is incomplete, and the airtightness of the lid and the pan cannot be reliably maintained.

  In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to realize a more reliable lid lock structure. In order to achieve the above object, the present inventor has paid attention to the fact that a cover plate made of a synthetic resin is less likely to be plastically deformed than a metal cover reinforcing plate.

  The pressure-type rice cooker targeted by the present invention is such that the open end of the pan 3 is sealed with the lid 4, and the inside of the pan is maintained in a high pressure state by the pressure adjustment mechanism provided on the lid 4, and the steam passage formed in the lid 4 The valve hole 17 provided on the valve hole 17 is closed by a ball 18, and the ball 18 closing the valve hole 17 can be forcibly moved by an operating body 22 that moves by the action of a solenoid 23. A part of the operating body 22 is engaged with a part of the lid lock mechanism, and when the ball 18 is forcibly moved, the engagement with the lock mechanism can be released to open and close the lid. It is.

  According to the first aspect of the present invention, a metallic lid reinforcing plate 30 is disposed on the inner surface of the synthetic resin lid plate 8, and the operating body 22 is slid on the exposed portion of the lid plate other than the surface of the lid reinforcing plate 30. Abut the surfaces. That is, the actuating body 22 contacts the back surface of the synthetic resin lid plate 8 and locks and unlocks the lid without contacting the metal lid reinforcing plate 30.

At this time, in order to bring the working body 22 into contact with the back surface of the synthetic resin lid plate 8, a part of the metal lid reinforcing plate located below the working body is cut out, and the lid plate exposed portion by the cutting is cut out. Is the sliding surface of the operating body .

The invention according to claim 2 improves the strength by passing the cut portion provided in the lid reinforcing plate 30 and arranging the lid reinforcing shaft 34 in the direction intersecting the lid reinforcing plate 30, that is, in the width direction of the lid. The At this time, a bulge continuous in the width direction is press-formed in the lid reinforcing plate so as to pass the lid reinforcing shaft, and a reinforcing protrusion is press-molded on the lid reinforcing plate in a direction intersecting with the bulge. is there.

  According to the lid lock structure of the pressure rice cooker of the present invention as set forth in claim 1, the actuating body 22 that locks and unlocks the lid 4 covers the surface of the lid plate 8 on the inner surface of the lid plate 8 that is a synthetic resin material. Move as a sliding surface. Therefore, even if the metal lid reinforcing plate 30 is deformed by a load due to heat or pressure due to long-term use, the operating body 22 can function normally without being affected by the deformation of the lid reinforcing plate 30. be able to. Thereby, the airtightness of the pan 3 and the lid 4 can always be maintained, and the locked state and the unlocking operation can be performed accurately.

A structure in which the operating body 22 is in contact with and slides on the surface of the lid plate 8 can be easily realized by a simple structure in which the cutout portion is provided in the lid reinforcing plate 30. Thereby, the comparatively big lid reinforcement board 30 which reinforces the whole lid | cover 4 is employable.

According to the second aspect of the present invention, by the structure of claim 2, wherein, to prevent the strength of the lid reinforcing plate 30 itself is reduced, in a state that is more strength, the lid reinforcing plate due to heat and pressure The deformation of 30 can be prevented and the strength of the lid can be improved.

  Drawing 1 is the whole longitudinal section showing an example of a pressure type rice cooker. This pressure rice cooker accommodates a pot 3 inside a main body composed of a bottom body 1 and a body 2, and seals the upper surface with a lid 4 to accommodate a pot 3, specifically a protective frame 6. Cooking rice is cooked by an electromagnetic induction heating method in which a pan is heated by an electromagnetic induction heating coil 5 arranged at the bottom of the rice.

  The lid 4 that opens and closes using the hinge shaft 7 at the back of the main body as a fulcrum is formed three-dimensionally by a lid plate 8 and a lid cover 9, and has a steam discharge mechanism and the like inside thereof, and a hook 10 at its front end, Engage with a part of the main body to maintain a sealed state. The hook 10 can be freely engaged and disengaged by operating the hook lever 11 exposed at the front end of the lid 4, and is also interlocked with the lock lever 12 arranged inside the lid 4 to engage the lock lever 12 with the operating body 13. By doing so, the sealed state of the lid 4 is reliably maintained, and cooking of the cooked rice can be performed in a high pressure state.

  A heating plate 13 heated by a heater (not shown) is mounted on the inner surface of the lid 4, that is, the bottom surface of the lid plate 8, and a heat radiating plate 14 is detachably provided on the lower surface of the heating plate. The packing 15 attached to the outer periphery of the heat radiating plate 14 is brought into close contact with the inner peripheral surface of the upper end of the pan 3, thereby ensuring the airtightness of the pan 3 and condensing by transferring the heat of the heating plate 13 to the heat radiating plate 14. Is preventing. The radiator plate 14 is provided with means for discharging steam generated in the pan 3.

  FIG. 2 is a bottom view of the heat radiating plate set including the heat radiating plate 14 that is detachable from the lid 4. The heat sink set of the embodiment shown in FIG. 2 functions as a steam discharge hole 16 as a normal steam discharge mechanism having a pressure control valve (not shown) and a safety valve that operates at a pressure higher than the set pressure by the pressure control valve. In addition, there are provided two steam discharge holes of the valve hole 17 of the steam discharge mechanism that can discharge the steam regardless of the internal pressure. Therefore, in the normal pressure rice cooking state, the steam is discharged from the steam discharge hole 16 so as to maintain a constant high pressure state by the action of the pressure regulating valve. When the steam is discharged from the valve hole 17. That is, the valve hole 17 functions as a valve hole of the safety valve.

  The structure of the steam discharge mechanism of the valve hole 17 is shown in FIG. A ball 18 functioning as a valve is disposed on the valve hole 17 and a support rib 19 is formed around the valve hole 17 so as to spread radially. As a result, the pressure in the pan 3 becomes higher than a set value. Then, the ball 18 is lifted and the steam is discharged from the valve hole 17. At this time, a cover 20 is provided on the outer periphery of the ball 18 so that the ball 18 does not move in a delusion. The outside of the cover 20 is covered with a bulging portion 21 formed by a part of the lid plate 8.

  In the pressure rice cooker, it is difficult to maintain the high pressure state and the lid 4 to open in the high pressure state. Therefore, the pressure rice cooker is brought close to the valve mechanism by the ball 18 which is one of the steam discharge mechanisms. A locking device is provided that can force the ball 18 to move. The lock device for forcibly moving the ball 18 includes an operating body 22 and a solenoid 23 for driving the operating body 22, and a pressing portion 24 of the ball 18 is formed at one end and a lock claw 25 is formed at the other end. When the actuating member 22 driven by the solenoid 23 is in a position where the ball 18 is not pushed, the ball 18 closes the valve hole 17 and can cook rice while maintaining the inside of the pan 3 at a high pressure. The lock claw 25 engages with the lock lever 12, and the lid 4 cannot be opened.

  That is, when performing high-pressure rice cooking, the solenoid 23 is excited by the rice cooking signal and resists the elasticity of the spring 26 disposed between the solenoid 23 and the operating body 22 as shown in FIG. The operating body 22 is moved to a position where the ball 18 in the left direction in the drawing is not pressed. When the cooking is not performed or when the cooking is interrupted, the excitation for the solenoid 23 is released. When the excitation of the solenoid 23 is released, as shown in FIG. 3B, the actuating body 22 moves rightward in the figure by the force of the spring 26, and the ball 18 is pushed out by the pressing portion 24 at the tip of the actuating body 22. The engagement between the lock claw 25 and the lock lever 12 is released. As a result, the steam is discharged from the steam discharge hole 17 to release the high pressure state, and at the same time, the hook 10 can be rotated as indicated by the dotted line, and the lid 4 can be freely opened and closed.

  The steam discharged from the steam discharge hole 17 is formed between the heat radiating plate 14 and the heating plate 13 by the packings 27 and 28 and is discharged to a steam passage leading to the outside of the device. As a result, the vapor does not enter the lid 4. In order to maintain the seal structure in which steam does not enter the lid, the working body 22 is connected via a seal cover 29 which is airtightly attached to the bulging portion 21 where the steam discharge mechanism by the ball 18 is covered. The pressing unit 24 presses the ball 18.

  4 is a plan view of the lid with the lid cover 9 removed, and FIG. 5 is a plan view of the lid reinforcing plate 30 attached to the lid plate 8. As shown in FIG. The lid 4 is mainly composed of a lid plate 8 and a lid cover 9 which are molded of a synthetic resin material. The lid plate 8 has a bulging portion 31 where a steam discharge mechanism by a pressure regulating valve is located, and a steam discharge mechanism by the ball 18. Is formed in the bulging portion 21 where is located, and a general reservoir 32 which is continuous with the steam discharge mechanism and is continuous with the exhaust hole of the cover plate 8. In addition, a solenoid 23 is fixed to the cover plate and a working body 22 driven by the solenoid 23 is disposed at a position approaching the bulging portion 21 of the steam discharge mechanism by the ball 18.

  In the pressure rice cooker, a large force acts on the lid 4 by setting the inside of the pan 3 to a high pressure. Accordingly, it is desirable to improve the strength of the synthetic resin lid plate 8, and a metal lid reinforcing plate 30 is disposed. As shown in FIG. 5, the lid reinforcing plate 30 is formed in a substantially rectangular shape extending in the front-rear direction, and the left and right side edge portions are raised to form side walls 30a and 30a. It is fixed. As a result, the strength of the lid 4 in the front-rear direction is largely improved. In the illustrated embodiment, a single lid reinforcing shaft 34 is disposed in the front portion of the lid separately from the lid reinforcing plate 30 so as to pass through the width direction orthogonal to the lid reinforcing plate 30, specifically, through the through-hole 35 portion. In this way, reinforcement in the width direction of the lid is also performed.

As described above, the bulging portions 21 and 31 and the pocket 32 are formed in the lid plate 8. In order to avoid these protruding portions, a part of the lid reinforcing plate 30 is cut out and a through hole 35 is formed. In the prior art of the present applicant, a through-hole was formed so as to mainly avoid only the protruding portion, and the lid reinforcing plate was not cut off in front of the bulging portion 21. Therefore, the operating body 22 slides on the upper surface of the lid reinforcing plate 30. On the other hand, in the present invention, the entire lower part of the working body 22 is cut out, for example, a large through hole 35 is formed. Therefore, the operating body 22 slides on the surface of the lid plate 8 exposed from the cut portion .

  The ball 18 of the steam discharge mechanism is pushed out by the ball 18, and the operating body 22 constituting the lid lock mechanism is molded into a substantially rectangular frame with a synthetic resin material as shown in FIG. A pressing portion 24 is formed so as to protrude from the rear center portion of the operating body 22, and a lock claw 25 is protruded toward one side in the front. The solenoid 23 is disposed within the frame of the operating body 22 formed in a rectangular frame shape, and drives the operating body 22 by connecting the operating portion to the base of the pressing portion 24. On the bottom surface of the operating body 22, protrusions 36 in the front-rear direction are formed on both the left and right sides, and smoothly slide on the surface of the lid plate 8. That is, as shown in FIG. 7, the operating body 22 driven by the solenoid 23 fixed in the recess of the lid plate 8 smoothly reciprocates in a state where the protrusion 36 is in contact with the sliding surface 8b of the lid plate.

  Note that the steam discharge mechanism by the ball 18, that is, the valve mechanism is arranged slightly closer to one side than the center of the entire main body. Therefore, the lock claw 25 to be engaged with the lock lever 11 located at the center of the main body protrudes obliquely forward from the front end of the operating body 22.

The lid reinforcing plate 30 attached to the lid plate 8 may be disposed in a region at a position rearward of the operating body 22. However, the lid reinforcing panel 30 of the present invention, the through-hole and 35 and those with front part of the lid reinforcing plate 30 in the embodiment shown in FIG. 5, the left and right side walls 30a in front of the through-hole 35 is cutting portion , 30a and a continuous portion 30b are formed to improve the strength of the entire reinforcing plate. As described above, the lid reinforcing shaft 34 is disposed so as to intersect the through-hole 35 portion. However, the lid reinforcing plate 30 has a mountain shape continuous in the width direction so as to pass the lid reinforcing shaft 34. The bulge 37 is press-formed, and the ridges 38, 38 are press-molded at two locations in the drawing in a direction crossing the bulge 37, in other words, the lid reinforcing shaft 34. By providing the bulge 37 and the protrusion 38, the strength of the lid reinforcing plate 30 can be improved while the large through hole 35 is formed.

The longitudinal cross-sectional view of the whole pressure type rice cooker which adopted the structure concerning the present invention, The heat sink set bottom view of the pressure type rice cooker shown in FIG. An enlarged sectional view of the first half of the lid, A plan view of the entire lid with the lid cover removed, Top view of the lid reinforcement plate, A perspective view of a working body, The expanded sectional view of the solenoid with respect to a cover board and an action body attachment part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bottom body, 2 ... Body, 3 ... Pan, 4 ... Cover, 5 ... Electromagnetic induction coil, 6 ... Protective frame, 7 ... Hinge shaft, 8 ... Cover plate, 9 ... Cover cover, 10 ... Hook, 11 ... Hook Lever, 12 ... Lock lever, 13 ... Heating plate, 14 ... Heat sink, 15 ... Packing, 16, 17 ... Steam exhaust hole, 18 ... Ball, 19 ... Support rib, 20 ... Cover, 21 ... Swelling part, 22 ... Actuator, 23 ... Solenoid, 24 ... Pressing part, 25 ... Lock claw, 26 ... Spring, 27, 28 ... Packing, 29 ... Seal cover, 30 ... Lid reinforcement plate, 30a ... Side wall, 30b ... Front part, 31 ... Swell Protruding part, 32 ... Pumps, 33 ... Bis, 34 ... Ladder reinforcement shaft, 35 ... Through hole, 36 ... Spi, 37 ... Swell, 38 ... Spi

Claims (2)

The open end of the pot was sealed with a lid, keeping the interior of the pot to a high pressure state by the pressure adjustment mechanism formed in the cover, by the action of the busy Giso solenoids valve hole provided in the steam passage formed in the lid by means of a ball The ball that closes the valve hole can be forcibly moved by the moving operating body, and a part of the operating body is engaged with a part of the lid lock mechanism to forcibly move the ball. In the pressure rice cooker that is able to open and close the lid by releasing the engagement with the lock mechanism when moved,
A metal lid reinforcing plate is disposed on the inner surface of the synthetic resin lid plate, a part of the metal lid reinforcing plate located below the operating body is cut off, and the exposed portion of the lid plate is removed by the cutting. A lid lock device for a pressure rice cooker, characterized by having a sliding surface. Pass the cut part provided on the lid reinforcement plate, place the lid reinforcement shaft in the width direction intersecting the lid reinforcement plate, and press the bulge continuous in the width direction so that the lid reinforcement shaft passes through the lid reinforcement plate The lid lock structure for a pressure rice cooker according to claim 1, wherein the lid is formed by pressing a reinforcing protrusion on the lid reinforcing plate in a direction crossing the bulge.

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