JP6933805B2 - rice cooker - Google Patents

Description

The present invention relates to a rice cooker technique.

The technology of each part of the rice cooker is disclosed. For example, Japanese Patent Application Laid-Open No. 2012-249945 (Patent Document 1) discloses a pressure-type rice cooker. According to Patent Document 1, it is a pressure type rice cooker having a rice cooker main body and a lid located above the rice cooker main body, and the rice cooker main body includes an inner pot and a heating means for heating the inner pot. The lid body has a first pressure adjusting device and a second pressure adjusting device, and the first pressure adjusting device has a spherical first valve body that opens and closes the first ventilation hole, and has a second pressure adjusting device. The device has a spherical second valve body that opens and closes the second vent, the first valve body opens and closes the first vent by being pressed in the horizontal direction, and the second valve body rotates. By being pressed vertically through the member, the closing force with respect to the second vent is increased and the valve functions as a safety valve.

Japanese Unexamined Patent Publication No. 2012-249945

One aspect of the present invention is to provide a rice cooker that is easier to use than before.

In one aspect of the present invention, a rice cooker including a main body and a lid rotatably supported by the main body is provided. The lid has a lever for opening and closing the lid that is slidable in the vertical direction, and a lever receiver that is slidable in the vertical direction and supports the lever from below via the first spring. It is located below the lever receiver and includes a stopper to release the lock on the main body when pushed downward by the lever receiver. Further, this rice cooker further includes a second spring that urges the lever receiver toward the lever side.

As described above, according to one aspect of the present invention, a rice cooker that is easier to use than the conventional one is provided.

It is a front perspective view of the rice cooker with the lid closed which concerns on this embodiment. It is a rear perspective view of the rice cooker with the lid closed which concerns on this embodiment. It is a front perspective view of the rice cooker with the lid open which concerns on this embodiment. It is a rear perspective view of the rice cooker with the lid open which concerns on this embodiment. It is a rear perspective view which shows the relationship between the lid part in the closed state and the upper and lower sheet metal which concerns on this embodiment. It is a rear perspective view which shows the relationship between the lid part with the lid open and the upper and lower sheet metal which concerns on this embodiment. It is a rear perspective view which shows the inside of the lid part which concerns on this embodiment. It is a front perspective view which shows the back side of the lid part with the inner lid and the Oneva recovery unit removed from the cover in the state which the cover is opened which concerns on this embodiment. It is a front perspective view which shows the back side of the lid part in the state which the inner cover and the Oneva recovery unit are attached to the cover in the state which the cover is opened which concerns on this embodiment. It is a side sectional view of the lid part which concerns on this embodiment. It is a 1st perspective view which shows the state which opened the oneva recovery unit which concerns on this embodiment. It is a second perspective view which shows the state which opened the oneva recovery unit which concerns on this embodiment. It is a top view which shows the vicinity of the solenoid inside the lid part which concerns on this embodiment. It is a side sectional view which shows the vicinity of the solenoid of the lid part which concerns on this embodiment. A front perspective view showing the right part of the lid portion in the state where the lever is not pressed in the state where the pressurization according to the present embodiment is not locked, and the right portion of the lid portion in the state where the lever is pressed. It is a front perspective view which shows. It is a front perspective view which shows the right part of the cover part in the locked state at the time of pressurization which concerns on this embodiment. It is a side sectional view of the lid part near the lever which concerns on this embodiment. It is a front sectional view of the lid part near the lever which concerns on this embodiment. It is a front perspective view which shows the inner part of the main body part which concerns on this embodiment, and the protection frame. It is a side surface which shows the inner part of the main body part which concerns on this embodiment, the protection frame, and the main IH unit. It is a side sectional view which shows the inner part of the main body part which concerns on this embodiment, the protection frame, and the main IH unit. It is a perspective view of the main IH unit which concerns on this embodiment. It is a side view of the main IH unit which concerns on this embodiment. It is a side sectional view which shows the positional relationship between the inner pot, the protective frame, and the main IH unit in the state which put the small inner pot which concerns on this embodiment. It is a side sectional view showing the positional relationship between the inner pot, the protective frame, and the main IH unit in the state where the large inner pot according to the present embodiment is inserted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, the detailed description of them will not be repeated.
<Overall configuration of rice cooker 100>

First, the overall configuration of the rice cooker 100 according to the present embodiment will be described. With reference to FIGS. 1 to 4, the rice cooker 100 mainly includes a main body portion 150 and a lid portion 110 rotatably attached to the main body portion 150. In the following, the hinge side of the lid 110 of the rice cooker 100 is the rear side, the lid opening / closing lever 111 side opposite to the hinge is the front side, and the side orthogonal to the front-rear direction is the left-right side.

In the state shown in FIGS. 1 and 2, when the user pushes the lid opening / closing lever 111, the lid 110 rotates upward with respect to the rear portion of the main body 150. As a result, as shown in FIGS. 3 and 4, the inner pot 190 installed in the main body 150 is opened.

In the present embodiment, the inner pot 190 will be described as a clay pot for IH, but the technique described below is not limited to the case where the inner pot 190 is a clay pot, and the inner pot 190 is compatible with IH. It is not limited to what is.
<Structure of lid 110>

Next, the configuration of the lid portion 110 according to the present embodiment will be described. As shown in FIGS. 5 and 6, notches 119L and 119R are formed in the lower portion of the back surface of the lid cover 119 as the outer surface of the lid portion 110. The rotation axis of the lid portion 110 with respect to the main body portion 150 is located in front of the rear end of the lid portion 110 by about several mm to 1 cm. In the present embodiment, upper and lower sheet metals 151L and 151R for supporting the rotation shaft of the lid portion 110 are attached to the rear portion and the upper portion of the main body portion 150, as will be described later. As a result, when the front portion of the lid portion 110 rotates upward, the rear portion of the lid cover 119 rotates downward and forward. In the present embodiment, the upper and lower sheet metals 151L and 151R are configured so as to enter the notches 119L and 119R so that the lid cover 119 and the upper and lower sheet metals 151L and 151R do not collide with each other.

More specifically, as shown in FIG. 7, front and rear sheet metals 115L and 115R for maintaining the strength of the lid portion 110 are attached to the lid portion 110 on the left side and the right side of the inside thereof in the front-rear direction. The rear end portions of the front and rear sheet metals 115L and 115R are fixed to the left and right ends of the rotating unit 116 which serves as a hinge between the lid portion 110 and the main body portion 150 in the present embodiment. The rotating unit 116 has an inner shaft (not shown) supported by upper and lower sheet metals 151L and 151R attached to the rear end of the main body 150. The rotating unit 116 includes a compression spring 112 that expands and contracts in the left-right direction, and cam members 113L and 113R that are attached to the left and right ends of the compression spring 112 and rotate around an inner shaft (not shown). The cam members 113L and 113R are interlocked with the front and rear sheet metals 115L and 115R.

As a result, the compression spring 112, the cam members 113L, 113R, and the front and rear sheet metals 115L, 115R can rotate with respect to the main body 150, the upper and lower sheet metals 151L, 151R, and the inner shaft. More specifically, the compression spring 112 urges the cam members 113L and 113R so as to be separated from each other in the left-right direction, whereby the cam members 113L and 113R are urged in the direction of rotating the lid 110 upward. It is configured to do. Since the rice cooker 100 according to the present embodiment is configured as described above, the rice cooker 100 according to the present embodiment is arranged in the order of the main body cover 151, the kata portion 160, and the lid cover 119 from the bottom in the rear view, and all the boundaries thereof are formed horizontally. Will be done.

Further, referring to FIG. 8, in the lid portion 110 according to the present embodiment, the inner lid 120 is detachably attached to the inside of the lid cover 119. Then, the Oneva recovery member 130 is sandwiched and fixed between the rear portion of the lid cover 119 (the lower portion when the lid is open) and the rear portion (the lower portion when the lid is open) of the inner lid 120. As a result, the user can easily remove the inner lid 120 and the Oneva recovery member 130 from the lid cover 119 and wash them, or again attach the Oneva recovery member 130 to the lid cover 119 as shown in FIGS. 9 and 10. It can be attached, or the inner lid 120 can be attached to the lid cover 119 and the Oneva recovery member 130.

In particular, in the present embodiment, the magnet 118Y is arranged on the back side of the lid cover 119, that is, on the inner lid 120 side, at a position facing the Oneva recovery member 130. The onee recovery member 130 contains a metal in the resin. As a result, the user can easily attach the Oneva recovery member 130 to the back surface of the lid cover 119, and can also reduce the rattling of both. Further, when the inside of the rice cooker 100 is pressurized, the one-sided recovery member 130 is pressed toward the lid cover 119 from below, so that the gap between the one-sided recovery member 130 and the lid cover 119 can be reduced.

Further, in the present embodiment, the magnet 118X is included on the back side of the lid cover 119, that is, on the inner lid 120 side, at a position facing the front portion (upper portion when the lid is open) of the inner lid 120. As a result, the user can easily attach the inner lid 120 to the back surface of the lid cover 119, and can reduce the rattling between the inner lid 120 and the back surface of the lid cover 119. Further, when the inside of the rice cooker 100 is pressurized, the inner lid 120 is pressed toward the lid cover 119 from the lower side to the upper side, so that the gap between the inner lid 120 and the lid cover 119 can be reduced.

More specifically, attachment pieces 138L are formed on the back surface of the Oneva recovery member 130, that is, on the left and right ends on the inner lid 120 side, respectively. The user attaches the Oneva recovery member 130 to the back surface of the lid cover 119 with the help of the magnet 118Y at the bottom of the back surface of the lid cover 119, and then attaches the Oneva recovery member 130 to each of the left and right ends of the inner lid 120. It is hooked on the piece 138L, and the inner lid 120 is attached to the back surface of the lid cover 119 and the oneva collecting member 130 with the help of the magnet 118X on the upper part of the back surface of the lid cover 119.

Further, as shown in FIGS. 11 and 12, the upper member 131 and the lower member 132 are detachably attached to the onee recovery member 130 according to the present embodiment. Therefore, the user can easily clean the inside of the oneva recovery member 130 by removing the onee recovery member 130 from the lid portion 110 and then further removing the upper member 131 and the lower member 132.
<Lock mechanism for opening and closing the lid 110>

Here, with reference to FIGS. 13 and 14, the pressure adjusting mechanism inside the rice cooker 100 according to the present embodiment will be described. In the present embodiment, in a state where the first solenoid 121R pushes the first plunger 129R rearward, the first pressure adjusting ball 128 opens the first pressure adjusting hole 127, and the inside of the inner pot 190 is opened. Maintained at atmospheric pressure. Next, as the first pressurizing state, the first solenoid 121R pulls the first plunger 129R forward, and the first pressure adjusting ball 128 closes the first pressure adjusting hole 127. At the same time, the second solenoid 122L pushes the second plunger 129L rearward, and a second pressure adjusting ball (not shown) lighter than the first pressure adjusting ball 128 is arranged on the second pressure adjusting hole. As a result, the pressure in the inner pot 190 is maintained at about 1.05 atm by the weight of the second pressure adjusting ball. Then, as the second pressurizing state, the first solenoid 121R pulls the first plunger 129R forward, and the first pressure adjusting ball 128 closes the first pressure adjusting hole 127. At the same time, the second solenoid 122L also pulls the second plunger 129L forward and presses the second pressure adjusting ball against the second pressure adjusting hole. As a result, the pressure in the inner pot 190 is maintained at about 1.25 atm by the weight of the first pressure adjusting ball 128. The magnitude of pressure and the pressure adjusting mechanism are not limited to such a form.

Next, with reference to FIGS. 13 to 18, a locking mechanism for preventing the lid 110 from opening even if the lever 111 is pushed during pressure cooking will be described. A link member 122 is attached to the first plunger 129R of the first solenoid 121R. The link member 122 includes a left-right frame 122A extending to the right from the first plunger 129R, and a front-rear frame 122B extending in the front-rear direction from the right end of the left-right frame 122A. The rear portion of the front-rear frame 122B rotates a rotating member 125 for pushing the first pressure adjusting ball 128 rearward via the interlocking member 123. That is, in the present embodiment, the front-rear sliding motion of the first solenoid 121R is bypassed to the right, that is, transmitted to the front-rear sliding motion of the link member 122, and finally the rotating member. It acts on the operation of 125, the first pressure adjusting ball 128, and the vertical slide member 147 described later.

With reference to FIGS. 13 and 15, the front-rear frame 122B of the link member 122 slides in the front-rear direction in accordance with the movement of the first plunger 129R of the first solenoid 122R in the front-rear direction. More specifically, as shown in FIG. 16, the front end portion of the link member 122 enters below the vertical slide member 147 which is slidably arranged vertically on the right portion of the front portion of the lid portion 110, or in FIG. As shown in the above, the front end portion of the link member 122 escapes from the lower side of the vertical slide member 147 to the rear side.

More specifically, except during pressure cooking, as shown in FIG. 15A, the vertical slide member 147 is normally located upward according to the urging force of the spring 148, but the user can use the lever. When the 111 is pushed downward, the vertical slide member 147 moves downward as shown in FIG. 15B as the stopper 145 rotates. However, when pressurizing the inside of the inner pot 190, that is, when the first solenoid 121R pulls the first plunger 129R forward and the link member 122 slides forward, the link is as shown in FIG. The front end portion of the member 122 enters below the vertical slide member 147, and the vertical slide member 147 hits the link member 122 and cannot move downward. That is, in the pressure cooking state, as shown in FIG. 16, the vertical slide member 147 and the right portion of the stopper 145 cannot move downward, and the stopper 145 remains hooked on the main body portion 150. That is, the opening of the lid 110 is restricted. In other words, as described later, even if the user presses the lever 111 at the center of the left and right sides of the lid 110, the lever spring described later only bends, the stopper 145 does not come off from the protective frame 170, and the lid 110 Can no longer be opened.

As shown in FIGS. 17 and 18, in the present embodiment, the lever 111 is slidably arranged above the lever receiver 143 via the spring 142. The lever receiver 143 is arranged above the stopper 145. More specifically, the lever receiver 143 is slidably attached to the lid 110 via the spring 144. The stopper 145 is a member long in the left-right direction at the front portion of the lid portion 110, and the right portion extends to the vicinity of the front end of the front and rear sheet metal 115R on the right side, and the left portion extends to the vicinity of the front end of the front and rear sheet metal 115L on the left side.

The lever 111 slides up and down along a hole 141A formed in the vertical direction in the slide member 141 supported by the lid cover 119 or another structure of the lid portion 110. The lever receiver 143 slides up and down along the hole 141B formed in the slide member 141 in the vertical direction.

The left and right central portions of the stopper 145 extend rearward, and the rear portion rotates in conjunction with the lever 111 via the spring 144, the lever receiver 143, and the spring 142. More specifically, the lever 111, the spring 142, the lever receiver 143, and the spring 144 slide in the vertical direction in response to the user's push, and the stopper 145 rotates in accordance with the vertical movement of the lever receiver 143. Since the lever 111 and the lever receiver 143 slide up and down, the user can smoothly push down the lever 111.

Then, the right end portion of the stopper 145 is extended rearward, and the lower surface of the rear portion abuts on the upper portion of the vertical slide member 147 and rotates in conjunction with the vertical movement of the vertical slide member 147. The right and left portions of the stopper 145 extend downward to the position of the main body portion 150, and the lower end portion is bent rearward to form the hook portion 145L.

As a result, at the time of pressurization, the front end portion of the link member 122 enters below the vertical slide member 147, the vertical slide member 147 hits the link member 122 and cannot move downward, and as a result, the stopper 145 cannot rotate, and the user cannot rotate. Even if the lever 111 is pushed downward, the springs 142 and 144 are only bent, and the stopper 145 cannot rotate. That is, the hooked portion 145L at the lower part of the stopper 145 is maintained in a state of being hooked on the locking portions 175L and 175R (see FIG. 19) of the protective frame 170 of the main body portion 150 described later, and the lid portion 110 is opened. Is prohibited.
<Structure of main body 150>

The main body portion 150 according to the present embodiment mainly includes a main body cover 151 shown in FIGS. 1 to 4, a kata portion 160 shown in FIGS. 1 to 4 and 19, and a protective frame 170 shown in FIG. include. Since the Kata portion 160 is a portion that can be seen by the user, it is made of, for example, polypropylene in order to improve the design. In the present embodiment, a protective frame 170 having substantially the same shape in a plan view is fixed below the Kata portion 160. Since the protective frame 170 is hidden by the Kata portion 160, it can be made of a material having a higher rigidity than the Kata portion 160. It is preferable that the Kata portion 160 and the protective frame 170 are fixed to each other at least around them by screws or screws so as not to have a gap as much as possible.

In the present embodiment, the protective frame 170 is integrally molded with an upper surface 170X facing the kata portion 160, a side surface 170Y facing the side surface of the inner pot 190, and a bottom surface 170Z facing the bottom surface of the inner pot 190. It is a thing. More specifically, the bottom surface 170Z includes a portion on an arc corresponding to the end of the bottom surface 170Z and located at the boundary with the side surface 170Y, and a horizontal portion corresponding to the central portion of the bottom surface 170Z.

As described above, in the present embodiment, the upper surface 170X, the side surface 170Y, and the bottom surface 170Z of the protective frame 170 are integrally molded. Then, it is preferable that the protective frame 170 and the kata portion 160 are fixed with as few gaps as possible. As a result, it is possible to reduce the escape of cooking heat from the gap between the protective frame 170 and the kata portion 160.

In the present embodiment, the upper surface 170X of the protective frame 170 extends below the rotation shaft 152 of the lid 110. Then, in a plan view, the protective frame 170 has substantially the same shape as the Kata portion 160. Upper and lower sheet metals 151L and 151R for rotatably instructing the lid 110 are attached to the rear portion of the upper surface 170X. At the rear of the Kata portion 160, upper and lower sheet metals 151L and 151R and a decorative wall 161 located in front of the rotating unit 116 are erected by integral molding.

Further, in the present embodiment, locking portions 175L and 175R for locking are provided on the front portion of the upper surface 170X of the protective frame 170. As a result, when the lid portion 110 is closed, the left and right hook portions 145L of the stopper 145 of the lid portion 110 are hooked on the locking portions 175L and 175R, respectively, so that the lid portion 110 is closed.

Further, in the present embodiment, as shown in FIGS. 20 and 21, an uncoated IH coil 172 is directly wound on the side surface 170Y of the protective frame 170. More specifically, the varnished IH coil 172 is wound directly around the side surface 170Y, and then the varnish is melted by heat treatment to directly fix the IH coil 172 to the side surface.

Then, the outer pot 171 is fixed to the inside of the protective frame 170. More specifically, the outer side surface of the outer pot 171 is attached to the inside of the side surface 170Y of the protective frame 170, and the lower surface of the bottom surface of the outer pot 171 is attached to the upper surface of the bottom surface 170Z with an adhesive.

The main IH unit 180 is arranged below the bottom surface 170Z of the protective frame 170. The main IH unit 180 is urged upward by springs 189, 189 ... From below. As shown in FIGS. 21 to 23, the frame of the main IH unit 180 has a position corresponding to a portion on the arc around the bottom surface of the inner pot 190, that is, a portion on the arc around the bottom surface 170Z of the protective frame 170. The IH coil 185X arranged at the position corresponding to the above and the IH coil 185Y arranged at the central portion of the bottom surface of the inner pot 190, that is, the central horizontal portion of the bottom surface 170Z of the protective frame 170 are attached. ..

In particular, in the present embodiment, holes 170H, 170H ... Are formed at a plurality of places on the bottom surface 170Z of the protective frame 170. Similarly, holes 171H, 171H ... Are also formed on the bottom surface of the outer pot 171 at positions facing the holes 170H, 170H .... A plurality of convex portions 182, 182 ... Are integrally molded on the frame 181 of the main IH unit 180.

Then, as described above, when the main IH unit 180 is urged upward by the springs 189, 189 ..., The convex portions 182, 182 ... Of the main IH unit 180 become holes 170H, 170H ... It is configured so as to penetrate the holes 171H, 171H ..., And the upper ends of the convex portions 182, 182 ... Are in contact with the bottom surface of the inner pot 190. More specifically, the elastic cover 173 is attached to the holes 170H, 170H ... Of the bottom surface 170Z of the protective frame 170, and the convex portions 182, 182 ... It touches the bottom.

In the present embodiment, the inner pot 190 is detachably attached to the kata portion 160. More specifically, the lower surface around the upper part of the inner pot 190 is placed on the circular rib 162 of the kata portion 160.

As a result, even if there is some variation in the dimensions of the inner pot 190, the bottom surface of the inner pot 190 and the convex portions 182, 182 ... Of the main IH unit 180 come into contact with each other. The variation in the distance between the plating and the IH coils 185X and 185Y can be reduced. In other words, in the present embodiment, when the inner pot 190 is placed on the kata portion 160 or the protective frame 170, the vertical position of the main IH unit 180 is automatically adjusted according to the size of the inner pot 190. Adjusted to the proper position.

Specifically, when the inner pot 190 is small, as shown in FIG. 24, the main IH unit 180 has the convex portions 182, 182 ... With holes 170H, 170H ... And holes 171H, 171H. ... It is moved upward by the springs 189, 189 ... Until it penetrates the inner pot 190 and touches the bottom surface of the inner pot 190. On the other hand, when the inner pot 190 is large, as shown in FIG. 25, the convex portions 182, 182 ... Of the main IH unit 180 form holes 170H, 170H ... And holes 171H, 171H .... Since it penetrates and immediately contacts the bottom surface of the inner pot 190, the main IH unit 180 descends downward against the springs 189, 189, and so on.

The configuration in which the main IH unit 180 is slid vertically with respect to the protective frame 170 and the kata portion 160 according to the present embodiment is particularly effective when the inner pot 190 has a variation in size such as a clay pot. ..
<Summary>

In the above embodiment, the rice cooker 100 including the main body 150 and the lid 110 rotatably supported by the main body 150 is provided. The lid 110 is a lever 111 for opening and closing the lid 110, which is slidable in the vertical direction, and a lever which is slidable in the vertical direction and supports the lever 111 from below via a spring 142. It includes a receiver 143 and a stopper 145 that is located below the lever receiver 143 and is pushed downward by the lever receiver 143 to release the lock on the main body 150.

Preferably, the stopper 145 extends in the left-right direction of the rice cooker 100. A member 122 for limiting the lowering of the stopper 145 during pressure cooking of the rice cooker 100 is arranged in the vicinity of at least one of the left and right ends of the stopper 145.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims, not the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

100: Rice cooker 110: Lid 111: Lid opening / closing lever 112: Compression spring 113L: Cam member 113R: Cam member 115L: Front and rear sheet metal 115R: Front and rear sheet metal 116: Rotating unit 118X: Inner lid magnet 118Y: For oneva recovery member Magnet 119: Cover cover 119L: Notch 119R: Notch 120: Inner lid 121R: First solenoid 122: Link member 122A: Left and right frame 122B: Front and rear frame 122L: Second solenoid 122R: First solenoid 123: Interlocking Member 125: Rotating member 127: First pressure adjusting hole 128: First pressure adjusting ball 129L: Second plunger 129R: First plunger 130: Oneva recovery member 131: Upper member 132: Lower member 138L: Mounting piece 142: Spring for lever (first spring)
143: Lever receiver 144: Lever receiver spring (second spring)
145: Stopper 145L: Hooking part 147: Vertical slide member 148: Spring 150: Main body 151: Main body cover 151L: Upper and lower sheet metal 151R: Upper and lower sheet metal 152: Shaft 160: Kata part 161: Decorative wall 162: Rib 170: Protective frame 170H : Hole 170X: Top 170Y: Side 170Z: Bottom 171: Outer pan 171H: Hole 172: Side IH coil 173: Elastic cover 175L: Lock lock 175R: Lock lock 180: Main IH unit 181: IH Frame 182: Convex part 185X: IH coil 185Y for bottom surface circumference: IH coil 189 for bottom surface center: Spring 190 for IH frame: Inner pot

Claims (2)

With the main body
The main body is provided with a rotatably supported lid.
The lid is
A lever for opening and closing the lid, which is configured to be slidable in the vertical direction,
A lever receiver that is configured to be slidable in the vertical direction and supports the lever from below via a first spring.
Located below the receiving the lever, by being pushed downward by the lever receiving, viewing including a stopper for releasing the lock on said body portion,
A rice cooker further provided with a second spring that urges the lever receiver toward the lever side. The stopper extends in the left-right direction of the rice cooker,
The rice cooker according to claim 1, wherein a member for limiting the lowering of the stopper is arranged in the vicinity of at least one of the left and right ends of the stopper during pressure cooking of the rice cooker.

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