JP2007068977A - Lid structure of rice cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lid structure of a rice cooker, in which an upper open part of a rice cooking pot 4 is closed by an inner lid 3 connected to an intermediate lid 22 provided on an outer lid 2, and an annular packing 2 formed of an elastic material is removably mounted on the outer peripheral edge part 31 of the inner lid 3, easily mounting the annular packing 1 always in a correct attitude on the inner lid 3. <P>SOLUTION: The annular packing 2 includes: a fitting part 12 having one annular groove part 10 to which the outer peripheral edge part 31 of the inner lid 3 is closely fitted; and a pair of first and second extension pieces 11, 12 symmetrically projected up and down, wherein when the inner lid 3 is fitted to the intermediate lid 22, the upper end part 11a of the upper first extension piece 11 is pressed to the intermediate lid 22, and when the upper open part of the rice cooking pot 4 is closed by the inner lid 3, the lower surface 13b of the fitting part 13 is pressed to the flange 41 of the rice cooking pot 4 or the open end part 41x. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lid structure for a rice cooker, and more particularly to a packing structure to be attached to an inner lid.

As shown in FIG. 6, the gas rice cooker generally has an outer lid (2) composed of an upper lid (21) and an inner lid (22), and a rubber cylinder shaft (30) in the center. The inner lid (3) is provided with a connecting shaft (20) projecting from the center of the inner lid (22), and the connecting shaft (20) is connected to the cylindrical shaft (30). The outer lid (2) and the inner lid (3) are integrated with each other by fitting the inner lid (3) in a retaining state. The upper lid (21) is pivotally supported at one end of the open end of the main body case (40) constituting the body of the rice cooker, and the upper open portion of the main body case (40) The lid is opened and closed freely.
A flange (41) protrudes outward from the open end of the rice cooker (4), and as described above, when the upper open part of the main body case (40) is closed with the lid, this flange (41) In addition, the outer peripheral edge portion (31) of the inner lid (3) contacts, and the upper open portion of the rice cooker (4) is closed by the inner lid (3).
An annular packing (5) made of heat-resistant rubber is detachably attached to the outer peripheral edge (31) of the inner lid (3) in order to ensure the sealing performance of the upper open portion of the rice cooker (4). It is attached to.

  The conventional annular packing (5) shown in FIGS. 6 and 7 includes a first seal portion (51) that is in close contact with the flange (41) of the rice cooker (4) and a first seal portion (51) that is in close contact with the lower surface of the inner lid (22). An elastic annular body having two seal portions (52) that is open toward the inside, and between the first seal portion (51) and the second seal portion (52) and the first seal. An annular piece (53) on which the outer peripheral edge (31) of the inner lid (3) is placed is inward at a predetermined position near the portion (51) in the state of being attached to the inner lid (3) It protrudes toward you.

  Thus, the annular packing (5) has a first annular groove (50a) between the first seal portion (51) and the annular piece portion (53), and the second seal portion (52) and the annular piece. A second annular groove (50b) larger than the first annular groove (50a) is formed between the outer circumferential edge portion (31) and a relatively large second annular groove (50b). ) And is placed on the annular piece portion (53) so that the annular packing (5) can be easily detached from the inner lid (3), and the inner lid (3) is washed. In this case, since the annular packing (5) can also be separated from the inner lid (3) and cleaned, it is hygienic.

Japanese Patent Laid-Open No. 11-262445 JP 2004-357780 A JP-A-2005-21335

However, in the above-described conventional annular packing (5), the first and second annular grooves (50a) and (50b) are formed in the inwardly opening groove. When the annular packing (5) once removed from (3) is mounted on the outer peripheral edge (31) of the inner lid (3) again, it is mistakenly inserted into the first annular groove (50a) or the annular packing ( 5) may be worn upside down. Since the conventional annular packing (5) is configured to have an asymmetrical vertical cross-sectional shape, when the rice cooking operation is performed in the wrong mounting manner as described above, the rice cooking pot (4 ) Cannot be secured with the flange (41) and the inner lid (22), which causes inconveniences such as steam leakage and spilling during cooking.
Therefore, the conventional annular packing (5) has to be mounted on the inner lid (3) with sufficient consideration of the vertical posture, and the mounting operation is troublesome.

  According to the present invention, an outer lid is constituted by an upper lid and an inner lid disposed below the upper lid, and the upper open portion of the rice cooker is closed by an inner lid connected to the middle lid at the center, In the `` lider structure of rice cooker in which an annular packing made of an elastic material is detachably attached to the outer peripheral edge of the lid '', the annular packing can always be easily attached to the inner lid in a correct posture. Let it be an issue.

(1) The technical means of the invention according to claim 1 of the present invention for solving the above-mentioned problem is as follows: “The annular packing has one annular groove portion into which the outer peripheral edge portion of the inner lid is closely fitted. And a pair of first and second extension pieces that are continuously and symmetrically projected upward and downward from the inner opening end of the fitting portion,
When the inner lid is attached to the inner lid, the upper end portion of the first extension piece extending upward from the fitting portion is in pressure contact with the inner lid, and the upper open portion of the rice cooker is closed with the inner lid. When, the lower surface of the fitting portion is set so as to be in pressure contact with the open end portion of the rice cooker or the flange protruding from the open end portion.

The technical means operates as follows.
Since only one annular groove portion into which the outer peripheral edge portion of the inner lid is fitted is formed in the annular packing, the outer peripheral edge portion of the inner lid is definitely fitted into the annular groove portion. Since the first and second extension pieces are formed so as to be symmetrical in the vertical direction from the fitting part, the first and second extension pieces are mounted so as to extend above the inner lid (3). You may do it.

  When the central portion of the inner lid to which the annular packing is attached is connected to the central portion of the inner lid, the upper end portion on the side extending above the first and second extension pieces presses against the inner lid. Thereby, the sealing performance between the inner lid and the inner lid is ensured. Further, when the upper open portion of the rice cooker is closed with the inner lid, the sides extending downward of the first and second extension pieces are in the rice cooker, and the lower surface of the fitting portion is the rice cooker. It becomes an aspect which press-contacts to the flange which protrudes from the open end part or open end part of a hook. Thereby, the sealing performance between the said inner cover and the upward open part of the said rice cooking pot is ensured.

Therefore, the steam in the rice cooker and the steam spouted above the inner lid through the hole provided in the inner lid do not leak outside between the rice cooker and the lid during rice cooking. .
Since the annular packing is detachable from the inner lid, the annular packing can be removed and cleaned. Thereafter, even if the upper and lower sides are reversed and attached to the inner lid, the annular packing is formed in a vertically symmetrical shape, so that the same action as the above action can be produced.

(2) Further, the technical means of the invention according to claim 2 is as follows: "The annular packing is gradually symmetrical in the vertical direction by opening one annular groove portion into which the outer peripheral edge portion of the inner lid is fitted inward. A substantially parabolic fitting section that expands, and a pair of first and second extension pieces that are symmetrically extended vertically from the inner open end of the fitting section,
When the inner lid is attached to the inner lid, the upper end portion of the first extension piece extending upward from the fitting portion is pressed against the inner lid, and the upper open portion of the rice cooker is closed by the inner lid. The lower surface of the fitting portion is set so as to be in pressure contact with the open end of the rice cooker or the flange protruding from the open end ”.

This also exhibits the same action as the technical means of the invention according to claim 1 described above.
In addition, since the fitting portion of the annular packing is formed in a substantially parabolic cross section that gradually expands symmetrically by opening one annular groove portion into which the outer peripheral edge portion of the inner lid is fitted inward. The space in the annular groove is formed widely. Therefore, when the outer peripheral edge portion of the inner lid is fitted in the annular groove portion, a space with a margin is formed above and below the outer peripheral edge portion of the inner lid. As a result, even if the outer peripheral edge of the inner lid that has been straightened is deformed partially or entirely later, or the outer peripheral edge of the inner lid is originally a curved flange, etc. The outer shape of the outer peripheral edge portion does not deform the outer shape of the fitting portion that forms the annular groove, and the first extension piece and the second extension piece are not deformed. That is, even if the outer peripheral edge of the inner lid is deformed without protruding straight, the outer shape of the fitting portion of the annular packing, the first extension piece, the second extension piece, etc. There is no deformation before and after installation.

  Therefore, even if the outer peripheral edge portion of the inner lid is deformed, the upper end portion of the first extension piece or the second extension piece is securely pressed against the inner lid, and the seal between the inner lid and the inner lid is ensured. Can be ensured, and the lower surface of the fitting portion is securely pressed against the open end of the rice cooker or the flange protruding from the open end, so that the sealing property between the inner lid and the upper open portion of the rice cooker can be secured. .

  In addition, since the space in the annular groove portion of the annular packing is formed wide, the inner lid can be easily attached to and detached from the outer peripheral edge portion, and the annular groove portion can be easily cleaned.

(3) The invention according to claim 3 is the lid structure of the rice cooker according to claim 1 or 2, wherein “the annular packings are in symmetrical positions on the upper and lower surfaces of the fitting portion, respectively. 1 or a plurality of annular ribs projecting concentrically with the fitting part, and when the upper open portion of the rice cooker is closed with the inner lid, the inner lid and the open end of the rice cooker Between the portion or the flange projecting from the open end, the fitting portion and the annular rib projecting from the lower surface thereof are pressed and deformed. Thereby, in addition to the said fitting part, both will be sealed by the said annular rib. Since the annular rib protrudes from both the upper and lower surfaces of the fitting portion, even if the annular packing is mounted on the inner lid upside down, the action by the annular rib is similarly generated.

(4) According to a fourth aspect of the present invention, in the lid structure of the rice cooker according to the first or second aspect, "the annular packing is located at symmetrical positions on the upper and lower surfaces of the fitting portion, respectively. The flange portion extending toward the inward direction is formed, and instead of the annular rib according to claim 3, the flange portion protruding inward is provided on both upper and lower surfaces of the fitting portion. Therefore, when the upper open part of the rice cooker is closed with the inner lid, the hook part is pressed and deformed between the inner lid and the flange protruding from the open end or the open end of the rice cooker. As a result, the gap between the two is sealed. This effect occurs similarly even when the annular packing is mounted on the inner lid upside down.

(5) The invention according to claim 5 is the rice cooker lid structure according to any of claims 1 to 4, wherein “the first and second extension pieces of the annular packing are thicker toward the tip side. Is gradually formed thinner ”, and the flexibility performance of the first extension piece and the second extension piece is improved. Therefore, even if the load with which the first extension piece or the second extension piece comes into contact with the inner lid is reduced, the upper end portion of the first extension piece or the second extension piece is reliably pressed against the inner lid.

(6) The invention according to claim 6 is the lid structure of the rice cooker according to any one of claims 1 to 5, wherein the first and second extension pieces of the annular packing have a spherical tip. The strength of the first extension piece and the second extension piece in the annular packing can be improved, and breakage such as cracks at the tips of the first extension piece and the second extension piece can be prevented. Therefore, the pressure contact state between the upper end of the first extension piece or the second extension piece and the inner lid can be stably secured.

  As described above, according to the first aspect of the present invention, the annular packing has only one annular groove portion into which the outer peripheral edge portion of the inner lid is fitted, and is vertically symmetrical about the annular groove portion. Since the annular packing is formed in a shape, it is always easy to fit the outer peripheral edge of the inner lid in the correct posture by simply fitting the outer peripheral edge of the inner lid into the annular groove without worrying about the upper and lower sides. Can be attached to. Therefore, defective cooking of rice such as steam leakage from a rice cooker during rice cooking or spilling over due to erroneous mounting of the annular packing can be eliminated, and in addition, it is possible to reduce the thermal insulation failure that causes the rice to dry during the thermal insulation.

  In addition, for example, when one of the first and second extension pieces or one of the upper and lower surfaces of the fitting portion is damaged and the sealing performance is impaired, If the annular packing is attached to the inner lid so that the damaged surface becomes the upper surface in the fitting portion, the use can be continued without any inconvenience, and the durability of the annular packing is improved.

  According to the invention which concerns on Claim 2, in addition to the said effect, even if the outer-periphery edge part of an inner cover deform | transformed, the sealing performance between an inner cover and an inner cover, upper part of an inner cover and a rice cooker The sealing property between the open part can be surely ensured and rice cooking failure and heat insulation failure can be prevented. Moreover, since the space in the annular groove portion of the annular packing is widely formed, it can be easily attached to and detached from the outer peripheral edge portion of the inner lid regardless of the shape of the outer peripheral edge portion of the inner lid, and cleaning of the annular groove portion is easy. It becomes easy to secure hygiene.

Moreover, according to the invention which concerns on Claim 3, since the sealing performance of an inner cover and the upper open part of a rice cooker improves, the rice cooking defect and the heat retention defect can be prevented further, and the one surface side of a fitting part Even if the annular rib is damaged, the sealing performance can be maintained by attaching the annular packing to the inner lid so that the damaged annular rib is positioned on the upper surface of the fitting portion.
Moreover, according to the invention which concerns on Claim 4, the effect similar to Claims 1-3 can be acquired.

  According to the invention which concerns on Claim 5, even if the load which a 1st extension piece or a 2nd extension piece contacts with an inner lid is small, the upper end part of a 1st extension piece or a 2nd extension piece is reliably with respect to an inner lid The sealing property between the inner lid and the inner lid can be reliably ensured by the pressure contact.

  According to the invention of claim 6, the strength of the first extension piece and the second extension piece in the annular packing can be increased, and damage such as cracks at the tips of the first extension piece and the second extension piece can be prevented. As a result, the pressure contact state between the upper end portion of the first extension piece or the second extension piece and the inner lid can be stably secured, and the sealing performance between the inner lid and the inner lid can be reliably secured.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
(Embodiment 1)
The lid structure of the rice cooker of Embodiment 1 shown in FIG. 1 is housed in the outer lid (2) that closes the upper portion of the main body case (40) and the main body case (40), as in the conventional case. An inner lid (3) that closes the upper open portion of the rice cooker (4), and the outer lid (2) includes an inner lid (22) connected to the inner lid (3), and It is comprised from the upper cover (21) which obstruct | occludes upper direction. A rubber cylindrical shaft (30) is fitted in the center of the inner lid (3), and a connecting shaft is provided in the cylindrical shaft (30) so as to protrude from the center of the inner lid (22). By inserting (20), the connecting shaft (20) is assembled to the cylindrical shaft (30) in a retaining state, and the inner lid (3) is integrated with the outer lid (2).

  A plurality of steam vent holes (32) pass through the inner lid (3) around the mounting portion of the cylindrical shaft (30), and the inner lid (3) and the inner lid (22) The space part (S1) in between communicates with the space part (S2) in the rice cooker (4) closed by the inner lid (3) through the steam vent (32). In the range where the inner lid (3) is provided one step lower than the formation position of the steam vent hole (32), the steam leaks from the steam vent hole (32) to the upper side of the inner lid (3). A through hole (33) is formed for returning the rice balls that come out into the rice cooker (4).

Hereinafter, the annular packing (1) to be mounted on the outer peripheral edge (31) of the inner lid (3) will be described.
The annular packing (1) is an annular body made of heat-resistant rubber, and as shown in FIG. 2, one annular groove (10) into which the outer peripheral edge (31) of the inner lid (3) can be tightly inserted. ) Is opened from the inner opening end (13x) (13y) of the fitting portion (13) and the fitting portion (13) formed so as to be opened inward (center direction of the annular packing). The first extension piece (11) and the second extension piece (12) having a circular arc cross section formed by extending vertically and inward symmetrically, and the fitting portion (13) Two annular ribs (14) and (15) are projected from the upper surface (13a) and the lower surface (13b), respectively.

  In the state where the outer peripheral edge (31) of the inner lid (3) is fitted into the annular groove (10) of the annular packing (1) and attached, the cylindrical shaft (30) of the inner lid (3) When the connecting shaft (20) of the inner lid (22) is inserted and the inner lid (3) is integrated with the outer lid (2), the first extension piece (11) extending above the annular packing (1) The length of the first extension piece (11) and the distance between the inner lid (3) and the inner lid (22) so that the upper end portion (11a) of the lower end of the inner lid (22) is in close contact with the lower surface of the inner lid (22). Is set to a predetermined dimensional relationship. Thereby, the space (S1) between the inner lid (3) and the inner lid (22) is sealed in an outer airtight state by the first extension piece (11).

  Further, in the state where the upper open portion of the main body case (40) is closed by the outer lid (2) and locked by a locking means (not shown), the upper open portion of the rice cooker (4) is the inner lid. (3) and the bottom surface (13b) of the fitting portion (13) of the annular packing (1) attached to the outer peripheral edge (31) of the inner lid (3) is the rice cooker (4) The flange (41) projecting outward from the open end portion (41x) is pressed and contacted via the annular rib (15). Thereby, between the flange (41) of the rice cooker (4) and the outer peripheral edge (31) of the inner lid (3), an annular rib that is crushed and is in close contact with the upper surface of the flange (41) ( 15), the outer peripheral airtight state is sealed. At this time, the second extension piece (12) extending downward has entered the rice cooker (4). Note that the lower surface (13b) and the annular rib (15) of the fitting portion (13) may be in pressure contact with the open end portion (41x) of the rice cooker (4).

  When cooking in this closed state, the steam generated in the rice cooker (4) flows from the steam vent hole (32) of the inner lid (3) between the upper surface of the inner lid (3) and the lower surface of the inner lid (22). Are partially ejected into the space (S1). The space portion (S1) is sealed in an outer airtight state by the first extension piece (11), and the space portion (S2) in the rice cooker (4) is fitted to the flange (41). Since the outer peripheral airtight state is sealed by the portion (13) and the annular rib (15), the steam and rice cake filling the space (S1) (S2) during cooking is a rice cooker (4). No leakage from the upper part of the top or between the inner lid (3) and the inner lid (22), and steam leakage and spillage during cooking can be prevented. In addition, since the sealing performance of the space portions (S1) and (S2) is ensured even after the cooking of rice is finished, drying during heat insulation can be prevented.

  Since the cylindrical shaft (30) is made of rubber as described above, it can be elastically deformed, and by forcibly deforming the shape of the cylindrical shaft (30), the cylindrical shaft (30) The inner cover (3) can be removed from the inner cover (22) by extracting the connecting shaft (20). Furthermore, the annular packing (1) can also be removed from the inner lid (3) and cleaned.

  After the cleaning, first, the annular packing (1) is attached to the outer peripheral edge (31) of the inner lid (3). The annular packing (1) employed in the first embodiment has a fitting portion (13) at the center. An annular groove (10) is formed in each of the first extension piece (11) and the second extension piece (12) having symmetrical shapes from the upper and lower sides of the inner open ends (13x) (13y). 2 is constructed so that the second extending piece (12) is positioned above the inner lid (3), contrary to the mounting posture shown in FIG. The upper end portion (12a) of the second extension piece (12) is in close contact with the lower surface of the inner lid (22) and seals, and protrudes from the surface (13a) which is the lower surface of the fitting portion (13). The annular ribs (14) and (14) are pressed against the flange (41) of the rice cooker (4), and the annular packing (1) has the same airtightness as described above even if it is turned upside down. Can be secured.

  Also, when either the first or second extension piece (11) (12) or one of the upper and lower annular ribs (14) (15) is damaged, the sealing performance cannot be secured. In the first extension piece (11) and the second extension piece (12), the damaged one is positioned downward, and in the annular ribs (14, 15), the damaged one is positioned above. In addition, the outer peripheral edge portion (31) of the inner lid (3) may be used by being fitted into the annular groove portion (10) of the fitting portion (13).

  In this way, even if a part is damaged, the annular packing (1) is formed symmetrically from the upper and lower sides, so that the use can be continued by reversing the upper and lower sides, so the annular packing (1) The durability is improved and it can be used for a long time.

(Modification)
FIG. 3 shows an annular packing (1 ′) in which the annular ribs (14), (15) are located at symmetrical positions on both the upper surface (13a) and the lower surface (13b) of the fitting portion (13). ) In place of the flanges 16 and 17 extending inward. The flange portions (16), (17) are elastic annular bodies having a substantially L-shaped cross section formed by extending from the vicinity of the outer peripheral end portion of the fitting portion (13) toward the inward opening portion side. With the annular packing (1 ') attached to the outer peripheral edge (31) of (3), the flange (17) located on the lower surface (13b) side of the fitting portion (13) is a rice cooker. It can be pressed and deformed by the upper surface of the flange (41) of (4), and the sealing performance between the rice cooker (4) and the outer peripheral edge (31) of the inner lid (3) can be ensured.

  Since the flanges (16) and (17) are formed symmetrically on both the upper surface (13a) and the lower surface (13b) of the fitting portion (13), the annular packing (1 ′) is turned upside down. Even if it is attached to the inner lid (3), the upper open portion of the rice cooker (4) is similarly sealed.

  In the annular packing (1) shown in FIGS. 2 and 3, the first extension piece (11) and the second extension piece (11) are closer to the tip side as in the second embodiment described below. The wall thickness may be gradually reduced, and the tips of the first extension piece (11) and the second extension piece (12) may be formed in a spherical shape.

(Embodiment 2)
In the lid structure of the rice cooker according to the second embodiment, the annular packing (1a) attached to the outer peripheral edge (31) of the inner lid (3) is the inner lid (3 And a fitting portion (13) formed in a substantially parabolic cross section that gradually opens in a vertically symmetrical manner by opening one annular groove portion (10) into which the outer peripheral edge portion (31) is fitted inward. A pair of first extension piece (11) and second extension piece (12) formed by projecting symmetrically from the upper and lower inner open ends (13x) (13y) of the joint (13) in a vertically symmetrical manner. With. The first extension piece (11) and the second extension piece (12) are formed so that the thickness gradually decreases toward the tip side, and the tips of the first extension piece (11) and the second extension piece (12) are formed. (11b) and (12b) are formed in a spherical shape.

  The difference between the second embodiment and that of the first embodiment is that the fitting portion (13) of the annular packing (1a) is formed in a substantially parabolic cross section that gradually expands vertically and symmetrically. Therefore, the space (S10) in the annular groove (10) is widely formed. Therefore, when the outer peripheral edge portion (31) of the inner lid (3) is fitted into the annular groove portion (10), a marginal space is formed above and below the outer peripheral edge portion (31) of the inner lid (3). The

  Further, the maximum outer diameter of the fitting portion (13) of the annular packing (1a) is determined by fitting the outer peripheral edge portion (31) of the inner lid (3) into the annular groove portion (10). The outer peripheral end (31a) of (31) is set so as to be in close contact with the bottom (10a) of the annular groove (10). Therefore, even if the space (S10) in the annular groove (10) is widely formed, the annular packing (1a) can be stably attached to the inner lid (3).

  And since the space (S10) in the annular groove (10) is widely formed, the outer peripheral edge (31) of the inner lid (3) that has been protruding straight is later partially or totally deformed. Even if the outer peripheral edge (31) of the inner lid (3) is originally a curved flange or the like, this annular packing (1a) can be attached to the inner lid (3). Depending on the shape of the outer peripheral edge (31) of (3), the outer shape of the fitting part (13) forming the annular groove (10) is deformed, or the first extension piece (11) and the second extension piece (12) There is no deformation. That is, even if the outer peripheral edge portion (31) of the inner lid (3) is deformed without being straightly extended, the outer shape of the fitting portion (13) of the annular packing (1a), the first extension piece ( 11) The second extension piece (12) and the like are not deformed before and after being attached to the inner lid (3).

  Therefore, even if the outer peripheral edge (31) of the inner lid (3) is deformed, the inner lid (3) with the annular packing (1a) is attached to the inner lid (22) to attach the outer lid (2 ), The upper end portion (11a) of the first extension piece (11) extending above the annular packing (1a) is securely pressed against the lower surface of the inner lid (22) (see FIG. 5). Thereby, the space part (S1) between the inner lid (3) and the inner lid (22) is sealed in an outer peripheral airtight state by the first extension piece (11).

  Further, when the outer lid (2) is closed to close the upper open part of the main body case (40), the lower surface of the fitting part (13) of the annular packing (1a) is attached to the flange (41) of the rice cooker (4). The bottom surface (13b) of the fitting portion (13) is securely pressed against the flange (41) and the open end portion (41x) of the rice cooker (4) (see FIG. 5). Thereby, the flange (41) and the open end (41x) of the rice cooker (4) and the outer peripheral edge (31) of the inner lid (3) are sealed in an outer airtight state. At this time, the second extension piece (12) extending downward is in a state of entering the rice cooking pot (4).

Thus, even if the outer peripheral edge portion (31) of the inner lid (3) is deformed, the upper end portions (11a) (12a) of the first extension piece (11) or the second extension piece (12). Is securely pressed against the inner lid (22) to ensure a sealing property between the inner lid (22) and the inner lid (3), and the lower surface (13b) of the fitting portion (13) is the rice cooker. The seal between the inner lid (3) and the upper open portion of the rice cooker (4) can be ensured by being securely pressed against the flange (41) and the open end (41x) of (4).
The annular packing (1a) has a wide space (S10) in the annular groove (10) so that it can be easily attached to and detached from the outer peripheral edge (31) of the inner lid (3). The inside of the groove (10) can be easily cleaned.

As described above, according to the lid structure of the rice cooker according to the second embodiment, the outer peripheral edge (31) of the inner lid (3) is not limited to the one that projects straight and horizontally, but the outer peripheral edge of the inner lid (3). Even if the part (31) is deformed, the sealing property between the inner lid (22) and the inner lid (3), between the inner lid (3) and the upper open part of the rice cooker (4) Sealing performance can be ensured, and rice cooking failure and heat insulation failure can be prevented.
In addition, since the space (S10) in the annular groove (10) of the annular packing (1a) is widely formed, the inner lid (3) regardless of the shape of the outer peripheral edge (31) of the inner lid (3) Can be easily attached to and detached from the outer peripheral edge (31), and the annular groove (10) can be easily cleaned and hygiene can be easily ensured.

  Further, since the first extension piece (11) and the second extension piece (12) are formed so that the thickness gradually decreases toward the tip side, the first extension piece (11) and the second extension piece (12) The flexibility performance of the upper end portions (11a) (12a) is further improved. Therefore, even if the load with which the first extension piece (11) or the second extension piece (12) contacts the inner lid (22) is small, the upper end portion (11a) or the second extension piece ( The upper end portion (12a) of 12) is reliably pressed against the inner lid (22), and the sealing performance between the inner lid (22) and the inner lid (3) can be ensured reliably.

  In addition, since the first extension piece (11) and the second extension piece (12) have spherical ends (11b) (12b), the first extension piece (11) and the second extension piece (11a) in the annular packing (1a) are formed. The strength of the two extension pieces (12) can be improved, and breakage such as cracks at the tips (11b) and (12b) of the first extension piece (11) and the second extension piece (12) can be prevented. Therefore, the pressure contact state between the upper ends (11a) (12a) of the first extension piece (11) or the second extension piece (12) and the inner lid (22) can be secured more stably, and the inner lid (22) The sealing property between the inner lid (3) can be reliably ensured.

In the second embodiment, the upper surface (13a) and the lower surface (13b) of the fitting portion (13) of the annular packing (1a) are provided with annular ribs (14) (15) as shown in FIG. Further, it is also possible to provide flanges (16) and (17) as shown in FIG.
Further, the thickness of the first extension piece (11) and the second extension piece (12) may be uniform over the entire area, and the tips (11b) of the first extension piece (11) and the second extension piece (12). (12b) may have various end shapes other than a spherical shape.
Other configurations and operational effects of the second embodiment are the same as those of the first embodiment.

It is sectional drawing which shows the cover structure of the rice cooker of Embodiment 1 of this invention. It is a principal part expanded sectional view of FIG. It is a principal part expanded sectional view which shows the other example of the cover structure of the rice cooker of Embodiment 1 of this invention. It is sectional drawing which shows the state which mounted | wore the inner cover with the annular packing as a cover structure of the rice cooker of Embodiment 2 of this invention. It is a partial cross section figure which shows the state which closed the outer cover as a cover structure of the rice cooker of Embodiment 2 of this invention. It is sectional drawing which shows an example of the cover structure of the conventional rice cooker. It is a principal part expanded sectional view of FIG.

Explanation of symbols

(1) (1a) ・ ・ ・ Annular packing
(2) ... outer lid
(3) ・ ・ ・ ・ ・ Inner lid
(4) ・ ・ ・ ・ ・ Cooking pot
(10) ... Annular groove
(11) ・ ・ ・ ・ ・ First extension piece
(12) ・ ・ ・ ・ ・ Second extension piece
(13) ・ ・ ・ ・ ・ Fitting part
(21) ・ ・ ・ ・ ・ Upper lid
(22) ・ ・ ・ ・ ・ Inner lid
(31) ・ ・ ・ ・ ・ Outer peripheral edge

Claims (6)

An outer lid is composed of an upper lid and an inner lid disposed below the upper lid, and an upper open portion of the rice cooker is closed by an inner lid connected to the middle lid at the center, and an outer peripheral edge portion of the inner lid In the lid structure of a rice cooker in which an annular packing made of an elastic material is detachably attached,
The annular packing is continuously connected up and down from a fitting portion in which one annular groove portion into which the outer peripheral edge portion of the inner lid is closely fitted is opened, and an inner opening end portion of the fitting portion. A pair of first and second extension pieces projecting symmetrically,
When the inner lid is attached to the inner lid, the upper end portion of the first extension piece extending upward from the fitting portion is pressed against the inner lid, and the upper open portion of the rice cooker is closed by the inner lid. When this is done, the lid structure of the rice cooker is set such that the lower surface of the fitting portion is pressed against the open end of the rice cooker or a flange protruding from the open end. An outer lid is composed of an upper lid and an inner lid disposed below the upper lid, and an upper open portion of the rice cooker is closed by an inner lid connected to the middle lid at the center, and an outer peripheral edge portion of the inner lid In the lid structure of a rice cooker in which an annular packing made of an elastic material is detachably attached,
The annular packing includes a fitting portion having a substantially parabolic cross section that gradually expands in a vertically symmetrical manner by opening one annular groove portion into which the outer peripheral edge portion of the inner lid is fitted inward, and an inner portion of the fitting portion. A pair of first and second extension pieces that are continuously and symmetrically projected from the open end to the top and bottom,
When the inner lid is attached to the inner lid, the upper end portion of the first extension piece extending upward from the fitting portion is pressed against the inner lid, and the upper open portion of the rice cooker is closed by the inner lid. When this is done, the lid structure of the rice cooker is set such that the lower surface of the fitting portion is pressed against the open end of the rice cooker or a flange protruding from the open end. In the lid structure of the rice cooker according to claim 1 or 2,
The annular packing has one or a plurality of annular ribs projecting concentrically with the fitting portion at mutually symmetrical positions on the upper and lower surfaces of the fitting portion. Lid structure. In the lid structure of the rice cooker according to claim 1 or 2,
The said annular packing formed the collar part extended toward the said inward in the mutually symmetrical position of the upper and lower surfaces of the said fitting part, respectively, The cover structure of the rice cooker characterized by the above-mentioned. In the lid structure of the rice cooker according to any one of claims 1 to 4,
The lid structure of a rice cooker, wherein the first and second extension pieces of the annular packing are formed so that the thickness gradually decreases toward the tip side. In the lid structure of the rice cooker according to any one of claims 1 to 5,
A lid structure for a rice cooker, wherein the first and second extension pieces of the annular packing have a spherical tip.

Images