JP7081077B2 - Resin boss structure and resin molded products - Google Patents

Description

The present invention relates to a resin boss structure for screwing a male screw member to fix another member, and a resin molded product having such a resin boss structure.

A conventional resin boss structure is described in, for example, Patent Document 1. In the resin boss structure described in the same document, a male screw member is hung on the entire circumference of the inner surface of the tubular portion to support the screw shaft portion of the male screw member.

Japanese Unexamined Patent Publication No. 2006-25863

In the above-mentioned conventional resin boss structure, when the residual stress when the male screw member is screwed in or the thermal stress due to the temperature change of heating or cooling is applied, there is no escape place for the stress, so that the fragile part in the cylinder portion is stressed. It was easy for cracks to occur.

In view of the above circumstances, it is an object of the present invention to provide a resin boss structure capable of preventing the occurrence of cracks due to stress, and a resin molded product having such a resin boss structure.

The resin boss structure according to the present invention is
It has a resin boss structure in which a male screw member is screwed in to fix another member.
An outer cylinder portion that can support the screw shaft portion of the male screw member and is erected on a plate-shaped portion, and
An inner portion integrally formed inside the outer cylinder portion is provided.
A hooking portion on which the male screw member is hooked and a gap portion formed between the hooking portions in the circumferential direction are provided on the inner portion.
Reinforcing ribs are erected at the boundary between the root of the outer cylinder portion and the plate-shaped portion and corresponding to the radial outer side of the gap portion .

According to the present invention, the male screw member inserted into another member is screwed into the inner portion, and the screw shaft portion is hooked on the hook portion to fasten the fastening. At this time, since the hooking portion can be freely deformed in the gap portion, the residual stress due to fastening is relaxed, and it is possible to avoid cracking in the outer cylinder portion or the like due to the stress at the time of fastening. Further, when the temperature change of heating or cooling acts, the hooking portion can be freely deformed in the gap portion, so that the thermal stress is prevented from being concentrated locally and the heat is applied to the outer cylinder portion or the like. It is possible to avoid the occurrence of cracks due to the stress caused by.
As described above, according to the present invention, the resin boss structure can suitably prevent the generation of cracks due to stress.

In the above configuration
It is preferable that a plurality of the gap portions are provided at equal intervals along the circumferential direction.

According to this configuration, since the hooking portion can be deformed toward each gap portion on both end faces in the circumferential direction, the stress acting on the hooking portion is alleviated and cracks are less likely to occur. Further, since the screw shaft portion is supported by each hooking portion in a state where a force is evenly applied in the circumferential direction, stable fastening can be realized by the male screw member.

In the above configuration
It is preferable that the inner diameter of the outer cylinder portion is larger than the nominal diameter of the male screw member.

According to this configuration, since the inner surface of the outer cylinder portion is not scratched by the male screw member, it is possible to prevent cracks from being generated from the inner surface of the cylinder portion of the outer cylinder portion when heat stress is applied.

In the above configuration
It is preferable that the hooking portion is formed so as to become wider in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction.

According to this configuration, for example, as compared with the case where the hooking portion has the same width regardless of the radial position, the screw thread of the screw shaft portion of the male screw member is hooked on the hooking portion and a frictional force acts. The area to be screwed up can be increased, and the fastening force can be increased.

Further, in the resin molded product according to the present invention, the resin boss structure as described above is integrally formed on the back surface of the plate-shaped portion serving as the exterior material.

According to the resin molded product according to the present invention, the advantages of the resin boss structure can be enjoyed. Further, since the resin boss structure can be firmly fastened by the male screw member and can prevent cracks due to stress, the structure can be realized without increasing the wall thickness of the outer cylinder portion and the like. By adopting it on the back surface of the plate-shaped portion as the exterior material, sink marks are less likely to occur on the surface on the opposite side of the portion corresponding to the resin boss structure. Therefore, it becomes easy to manufacture a resin molded product that satisfies both functionality and design.

It is a top view which shows the rice cooker. It is a side view which shows the rice cooker. It is sectional drawing (A1-A1 sectional view of FIG. 1) of the side view which shows the rice cooker. It is sectional drawing (A2-A2 sectional view of FIG. 1) of the side view which shows the rice cooker. It is an exploded perspective view of the diagonal rear view which shows the state which the protection frame and the shoulder member were removed from the main body case. It is an exploded perspective view of the diagonal front view which shows the state which the protection frame and the shoulder member were removed from the main body case. It is a bottom view which shows the back surface of a Mayban member. It is a bottom view which shows the resin boss structure. It is a perspective view of the diagonal front-down view which shows the resin boss structure. It is sectional drawing of the side view which shows the resin boss structure. It is sectional drawing (enlarged sectional view of FIG. 3) of the side view which shows the steam path and the periphery of a Oneva separation unit in an enlarged manner. It is an exploded perspective view of the diagonally anterior-upward view showing each part constituting the steam path by disassembling. It is a side view which shows the oneva separation unit. It is a bottom view which shows the oneva separation unit. It is sectional drawing (A3-A3 sectional drawing of FIG. 14) of the front view which shows the oneva separation unit. It is an exploded perspective view of the lower member and the vesicle-reducing member of the Oneva separation unit in an oblique rearward view. It is sectional drawing which shows typically the state which the steam flow flows into the oneva separation unit. It is sectional drawing which shows typically the state which oneva returns from the oneeva separation unit toward the rice cooking space side. It is a schematic cross-sectional view which shows the 1st misattachment state. It is a schematic cross-sectional view which shows the 2nd misattachment state. It is a bottom view which shows the oneva separation unit in another embodiment. It is sectional drawing (A4-A4 sectional view of FIG. 21) of the front view which shows the oneva separation unit in another embodiment. FIG. 3 is an exploded perspective view of an oblique rearward view showing a lower member and a vesicle-reducing member of the Oneva separation unit in another embodiment.

Hereinafter, embodiments that are examples of the present invention will be described with reference to the drawings. In the present embodiment, the pressure type rice cooker 1 will be described as an example of the “rice cooker”. The pressure type rice cooker 1 has an IH heating method. The front-back direction of the pressure-type rice cooker 1 shall be as shown in FIGS. 1 and 2.

As shown in FIGS. 1 to 4, the pressure type rice cooker 1 (an example of a “rice cooker”) is provided with a main body unit 2 and a lid unit 3 that can be opened and closed with respect to the main body unit 2. There is. The main body unit 2 and the lid unit 3 are connected by a hinge mechanism 4 located at the rear of the pressure type rice cooker 1. As shown in FIG. 3 and the like, the lid unit 3 is supported so as to be openable and closable with respect to the main body unit 2 via the hinge mechanism 4. By closing the lid unit 3, a rice cooking space S1 capable of pressure-cooking the cooked rice is formed between the lid unit 3 and the main body unit 2. As an explanation, the lid unit 3 can be opened and closed by swinging around the swing axis X of the hinge mechanism 4 with respect to the main body unit 2.

As shown in FIGS. 3 and 4, the main body unit 2 can accommodate an inner pot 5 for storing rice to be cooked. The main body unit 2 is provided with a main body case 6 forming a part of the exterior material E, a support structure portion 85 forming a part of the exterior material E, and the like. The support structure portion 85 is integrally connected and fixed to the shoulder member 9 forming a part of the exterior material E adjacent to the upper side of the main body case 6 and to the lower side of the shoulder member 9 having higher strength than the shoulder member 9. A protective frame 8 and a protective frame 8 are provided. Further, the support structure portion 85 has an accommodating portion 7 for accommodating the inner pot 5, and a connecting portion 86 extending rearward from the accommodating portion 7 to connect and support the hinge mechanism 4. Further, the main body unit 2 includes an IH heater 10 which is a heating means, a center sensor 11 which detects the pot temperature of the inner pot 5 as an example of sensors, and a main body side control device 12 which controls the IH heater 10. A cooling fan 13 or the like for discharging heat to the outside is provided.

As shown in FIGS. 3 to 6 and the like, the main body case 6 surrounds the lower portion of the support structure portion 85 and constitutes a part of the exterior material E adjacent to the lower side of the support structure portion 85. ing.

The shoulder member 9 can be made of, for example, a synthetic resin such as polypropylene. The protective frame 8 can be made of, for example, a member having a higher strength than the shoulder member 9. Specifically, the protective frame 8 can be made of a heat-resistant synthetic resin such as polyethylene terephthalate.

As shown in FIGS. 1 to 3, the lid unit 3 includes a support base material 14 that is a rigid member that supports each member, and a lid cover 15 that constitutes a part of the exterior material E (an example of a “separate member”). ), Mayban member 16 (an example of a "resin molded product") that constitutes a part of the exterior material E and is connected and fixed to the lid cover 15, sheet metal frame 17 that connects the hinge mechanism 4 and the support base material 14, and the main body. Various information by controlling the lid side control device 18, the lock mechanism 19, the lock release lever 20 for releasing the lock mechanism 19, the operation button 21 for performing various operations, and the lid side control device 18 connected to the side control device 12. A display unit 22 or the like for displaying the above is provided. Further, the lid unit 3 is provided with an inner lid unit 23 that is detachably attached to the lower surface of the support base material 14.

As shown in FIG. 3, the main body side control device 12 and the lid side control device 18 are connected by a flexible flat cable 80 (FFC; wiring cable). The flexible flat cable 80 is arranged so as to pass near the hinge mechanism 4 and near the rear end portion of the main body unit 2.

As shown in FIG. 1, the area where the lock release lever 20, the operation button 21, and the display unit 22 are arranged is laid out by widely using the front half of the top surface of the lid unit 3.

Further, as shown in FIGS. 1 to 4, 11 and the like, a steam flow containing oneeba is introduced into the lid unit 3 from the rice cooking space S1 for cooking rice to be cooked via the steam path P, and the internal air is introduced. In the liquid separation space S2, the rice cooker separation unit 25 that separates the rice cooker and discharges the vapor from the steam discharge port 24 is provided. The oneva separation unit 25 is detachably provided with respect to the recess of the lid cover 15.

When the lid unit 3 is in the non-pressurized state, the lock of the lid unit 3 in the closed state with respect to the main body unit 2 is released by pressing the lock release lever 20, and the hinge spring 26 (see FIG. 3 and the like) is attached. The force causes the lid unit 3 to swing to the open state. Although detailed description is omitted, in the pressurized state during pressure rice cooking, the lock of the lid unit 3 cannot be released even if the lock release lever 20 is operated.

As shown in FIGS. 3 and 4, the inner lid unit 23 has a plate-shaped inner lid portion 27, an annular inner lid packing 28 for sealing the inner lid portion 27 and the upper edge portion of the inner pot 5. It is provided with a pressure control unit 29 and the like having two pressure control holes for circulating a steam flow including one and a pressure control hole and a pressure control ball (not shown) corresponding to each pressure control hole.

As shown in FIGS. 3 and 4, by closing the lid unit 3, the inner pot 5 is sealed by the inner lid unit 23, and the cooked rice is placed between the lid unit 3 and the main body unit 2. A rice cooking space S1 for cooking rice is formed.

The pressure type rice cooker 1 performs rice cooking (pressure rice cooking) in which the rice cooking space S1 is maintained in a pressurized state exceeding the atmospheric pressure by the action of the pressure adjusting unit 29 shown in FIGS. 3, 4, 11, and 12. Is possible. For example, the pressure adjusting unit 29 has an atmospheric pressure (1 atm), a first pressurized state (for example, 1.05 atm) higher than the atmospheric pressure, and a second pressurized state (for example, 1.25 atm) from the first pressurized state. The pressure state of the rice cooking space S1 can be switched.

[Structure to prevent a gap between the main body case 6 and the shoulder member 9]
As shown in FIGS. 3 to 6, the support structure portion 85 is provided with a shoulder member 9 and a protective frame 8 connected and fixed so as to be integrated with the shoulder member 9. The protective frame 8 is provided with a rear extending portion 30 integrally connected to the rear of the accommodating portion 7 to connect and fix the hinge mechanism 4. The protective frame 8 is made of a rigid member that is unlikely to be elastically deformed.

The bottom surface of the accommodating portion 7 of the protective frame 8 is fixed to the main body case 6 by screwing or the like. Further, as shown in FIG. 5, the protective frame 8 and the shoulder member 9 are hooked and fixed by a plurality of hooking structures 31 at the peripheral edge portion. Each hooking structure 31 is adapted to hook a rectangular annular body on the shoulder member 9 side to a hook body on the protective frame 8 side.

As shown in FIGS. 3 to 6, the shoulder member 9 is provided with a rear extending portion 32 extending rearward with respect to the accommodating portion 7. The rear portion of the rear extending portion 32 is provided with a support sheet metal 34 for supporting the pin member 33 extending along the lateral direction in the hinge mechanism 4.

As shown in FIGS. 2 to 6, the shoulder member 9 is provided with an exposed portion 87 that is sandwiched between the lid unit 3 and the main body case 6 and exposed to the outside. The exposed portion 87 is formed so as to be located on the entire circumference of the upper edge portion of the main body unit 2.

As shown in FIGS. 4 to 6, a locking structure 35 capable of locking the main body case 6 is provided on the protective frame 8 side at the rear portion of the main body unit 2. The locking structure 35 has a protrusion 37 protruding from the support structure 85 toward the main body case 6 side, and a protrusion 37 protruding from the main body case 6 toward the support structure 85 side to apply a pressing force from below. It is composed of a pressed protrusion 36 that can be received. The protrusion 37 is integrally formed with the rear end portion of the protective frame 8.

As shown in FIGS. 4 and 5, the locking structure 35 is located behind the hinge mechanism 4. The locking structures 35 are provided in pairs with a predetermined distance in the left-right direction. That is, two (plurality) locking structures 35 are provided.

As shown in FIG. 4, the pressed protrusion 36 has a triangular shape protruding from the inner surface of the main body case 6 in a side view. As shown in FIG. 5, the protrusion 37 has a substantially U-shaped shape when viewed from the rear, and surrounds the lower surface and both side surfaces of the corresponding pressed protrusion 36. At the time of pressure rice cooking, the bottom surface of the protrusion 37 pushes up the lower surface of the pressed protrusion 36.

Further, as shown in FIG. 5, the pressure type rice cooker 1 is provided with another locking structure 91. The other locking structure 91 is located in front of the hinge mechanism 4. The other locking structure 91 is provided at the rear portion of the main body unit 2, and has a protrusion 93 protruding from the support structure portion 85 toward the main body case 6 side and a protruding portion 93 protruding from the main body case 6 toward the support structure portion 85 side. It is composed of a pressed piece 92 capable of receiving a pressing force from below by the protrusion 93.

As can be understood from FIGS. 3 and 4, when pressure rice is cooked, the rice cooking space S1 is in a pressurized state in which the rice cooking space S1 is pressurized to a pressure exceeding the atmospheric pressure, and the lid unit is placed on the main body unit 2. The force that 3 tries to lift is applied. Therefore, the shoulder member 9 integrally fixed to the protective frame 8 and the protective frame 8 can be lifted by the hinge mechanism 4 which is the connecting point between the main body unit 2 and the lid unit 3. Therefore, at the time of pressure rice cooking, the rear extending portion 30 of the protective frame 8 and the rear extending portion 32 of the shoulder member 9 extending rearward from the rice cooking space S1 (accommodating portion 7) are provided to some extent. It may be pulled up by the hinge mechanism 4 to bend and deform.

However, at this time, as shown in FIGS. 4 and 5, a locking structure 35 and another locking structure 91 are provided at the rear portion of the main body unit 2. In the locking structure 35, the protrusion 37 formed on the protective frame 8 pushes the pressed protrusion 36 upward, and the main body case 6 is moved toward the shoulder member 9 by the amount of bending deformation of the protection frame 8 and the shoulder member 9. Be drawn in. Further, also in the other locking structure 91, the protrusion 93 formed on the protective frame 8 pushes the pressed piece 92 upward, and the main body case 6 is pulled toward the shoulder member 9. Therefore, when pressure rice is cooked, it is possible to effectively prevent a gap in appearance between the main body case 6 and the shoulder member 9 at the rear end portion of the main body unit 2, and the appearance is not impaired. ..

Further, since it is not necessary to provide a reinforcing sheet metal or the like on the rear surface portion of the main body case 6, it is possible to omit the measures against static electricity for the flexible flat cable 80. Further, since it is not necessary to provide such a reinforcing sheet metal or the like, as shown in FIGS. 2 to 4, the rear surface portion of the main body case 6 can be designed to be curved inward from the upper side to the lower side. It will be like. Therefore, the design of the rear surface portion of the main body unit 2 is improved.

[About the resin boss structure 38]
As shown in FIGS. 7 to 10, the Maban member 16 constituting a part of the exterior material E of the pressure-type rice cooker 1 has a resin boss structure 38 that is less likely to crack due to stress, and the surface thereof is an exterior portion. It is used in a suitable place on the back surface of the plate-shaped portion 43. The resin boss structure 38 is used to screw in a metal screw 39 (an example of a “male screw member”) to fix the lid cover 15. To add an explanation, the resin boss structure 38 is integrally formed with the Mayban member 16 made of hard resin, and is used for fastening the Mayban member 16 and the lid cover 15 with a metal screw 39.

As shown in FIGS. 8 to 10, the resin boss structure 38 is integrally formed inside the outer cylinder portion 41 and the outer cylinder portion 41 that can be supported by inserting the screw shaft portion 40 of the screw 39. The screw 39 has an inner portion 42 that is engaged and exerts a fastening force. The outer cylinder portion 41 is provided on the back surface (lower surface) of the plate-shaped portion 43 of the Mayban member 16. As shown in FIG. 10, the screw 39 is inserted from the back side (lower side) of the insertion hole formed in the lid cover 15, and the screw 39 is fastened to the resin boss structure 38 on the back side of the Mayban member 16. The Mayban member 16 is fixed to 15. In the present embodiment, the resin boss structure 38 is not screwed in advance, and is fastened by self-tapping with a screw 39.

As shown in FIGS. 8 to 10, the inner portion 42 is provided with a gap portion 44, which is a space in which the hooking portion 45 is separated in the circumferential direction. The gap portion 44 is formed in substantially the entire area along the axial direction of the inner portion 42. Four (plural) gaps 44 are provided at equal intervals along the circumferential direction. The width of the gap 44 in the circumferential direction is shorter than the width of the hanging portion 45 in the circumferential direction. As a result, it becomes possible to secure a relatively large hooking allowance for the screw 39 in the hooking portion 45, and it is possible to perform a firm fastening.

As shown in FIGS. 8 and 9, in the resin boss structure 38, the hooking portion 45 of the inner portion 42 is formed so as to become wider from the radial inner side to the radial outer side. Further, the hooking portion 45 of the inner portion 42, which is not the gap portion 44, has a substantially fan-shaped shape in a cross-sectional view orthogonal to the axial direction. Therefore, when the screw 39 is tightened to the hooking portion 45 of the inner portion 42, it is possible to increase the hooking margin and increase the fastening force.

Further, the gap 44 of the inner portion 42 is formed so as to become wider from the inner side in the radial direction to the outer side in the radial direction. Further, each of the gap portions 44 has a substantially fan-shaped shape in a cross-sectional view orthogonal to the axial direction. The gap portion 44 extends along the axial direction from the end surface of the inner portion 42 to the boundary with the plate-shaped portion 43.

As shown in FIGS. 8 and 9, a reinforcing rib 46 is erected between the outer cylinder portion 41 and the plate-shaped portion 43 of the Mayban member 16. A plurality of reinforcing ribs 46 are provided dispersed in the circumferential direction. The reinforcing rib 46 reinforces the boundary between the root of the outer cylinder portion 41 and the plate-shaped portion 43, making it difficult for cracks and the like to occur.

As shown in FIG. 8, in the resin boss structure 38, the cylinder inner diameter D1 of the outer cylinder portion 41 is larger than the nominal diameter D2 of the screw 39. Further, the inner surface diameter D3 of the hooking portion 45 of the inner portion 42 is smaller than the nominal diameter D2 of the screw 39. That is, it is preferable to use a screw 39 having a nominal diameter D2 larger than the inner surface diameter D3 of the inner portion 42 and smaller than the cylinder inner diameter D1 of the outer cylinder portion 41. As a result, the screw 39 is not scratched on the inner surface of the outer cylinder portion 41, and cracks are less likely to occur in the outer cylinder portion 41. The diameter of the screw groove of the screw 39 is smaller than the inner surface diameter D3 of the hooking portion 45.

With such a resin boss structure 38, when heating and cooling during rice cooking are applied to the outer cylinder portion 41, the hooking portion 45 of the inner portion 42 can be deformed so as to enter the gap portion 44. , The thermal stress can be released. Therefore, it is possible to prevent cracks due to thermal stress from occurring at the outer cylinder portion 41, the boundary between the outer cylinder portion 41 and the plate-shaped portion 43, and the like. Further, since cracks can be prevented without increasing the wall thickness of the outer cylinder portion 41, a resin that does not easily cause sink marks on the surface of the thin plate-shaped portion 43 constituting the exterior material E during integral molding. It has a boss structure 38. Further, in order to avoid sink marks, it is possible to avoid excessively thickening the plate-shaped portion 43 of the Mayban member 16. That is, it becomes possible to reduce the amount of resin used, which also contributes to cost reduction.

[About steam path P]
As shown in FIGS. 11 and 12, the lid unit 3 is provided with a steam path P for connecting the pressure regulating unit 29 to the oneva separation unit 25 having the steam discharge port 24. A steam stream including one, a liquid one, and the like pass through the steam path P.

The steam path P is composed of a plurality of parts (members). For example, as a portion constituting the steam path P, an extension member 48 which is extended so as to be away from the pot center C of the inner pot 5 and is provided with an outlet 47 for guiding a steam flow to the oneva separation unit 25, and an outlet 47. A first packing 49 for sealing between the one-sided separation unit 25 and a second packing 50 for sealing the outer end portion of the extension member 48 are provided.

Further, as shown in FIG. 11 and the like, as a portion constituting the steam path P, a guide portion 52 having a oneva return surface 51 having a downward gradient from the oneva separation unit 25 side toward the pressure adjusting portion 29 side is provided. ing. The gradient of the oneva return surface 51 may be set to an angle between, for example, about 10 degrees and about 20 degrees. The guide portion 52 is provided with lateral wall portions that stand up on both side surfaces of the Oneva return surface 51. An intermediate opening 54 for passing a steam flow or oneva is provided between the extension member 48 side and the enclosure 53 side which is a part of the support base material 14 surrounding the space around the pressure regulating portion 29. ..

As can be understood from FIG. 3 and the like, in the pressure type rice cooker 1, a strong force is applied to the portion supporting the hinge mechanism 4 on the main body unit 2 side during pressure rice cooking, so in order to increase the strength, the inner pot 5 is used. The position of is set to a position considerably forward from the hinge mechanism 4. Then, as shown in FIGS. 1 and 3, in order to enhance the convenience of the user, the area where the operation button 21 and the display unit 22 are provided is laid out using the area of the front half or more of the lid unit 3. Therefore, the oneva separation unit 25 needs to be laid out in the lid unit 3 at a place away from the inner pot 5 and avoiding the operation button 21, the display unit 22, and the like. Therefore, as shown in FIGS. 3 and 11, the rear end position B1 of the steam path P is extended to the position B2 directly above the minimum inner diameter portion 55 having the smallest inner diameter in the inner pot 5.

That is, the extension member 48, the first packing 49, the second packing 50, and the like can be provided to set the terminal position of the steam path P at a position away from the inner pot 5. Specifically, the steam path P can be freely laid out by selecting an extension member 48 or the like having an appropriate shape according to the positional relationship in which the inner pot 5 and the oneba separation unit 25 are arranged. Become. The degree of freedom in layout design of the Oneva separation unit 25 is improved. As a result, the degree of freedom in designing the lid unit 3 is significantly improved.

[About Oneva Separation Unit 25]
As shown in FIGS. 3, 11, 13 to 18, etc., the oneva separation unit 25 includes a lower member 56 into which a steam flow or oneva flows in and out of the rice cooking space S1 through a steam path P. An upper member 57, which is combined with the lower member 56 to form a gas-liquid separation space S2 for separating gas vapor and liquid oneva, is provided.

As shown in FIGS. 14, 16 to 18, etc., the lower member 56 has an introduction hole 58 for introducing a steam flow containing oneba from the rice cooking space S1 into the gas-liquid separation space S2, and stores in the gas-liquid separation space S2. A return hole 59 for returning the cooked onee to the rice cooking space S1 is provided. The introduction hole 58 is formed inside a tubular peripheral wall 81 extending like a chimney rising from the lower surface of the lower member 56. The return holes 59 have, for example, a fan shape, and are provided in a plurality of holes dispersed in the circumferential direction.

As shown in FIGS. 3, 13, 14, 16, 16 and the like, the lower member 56 has a detachable hook 61 (see FIG. 13 and the like) urged in the protruding direction by the urging spring 60 (see FIG. 3). It is prepared. The attachment / detachment hook 61 can be suitably attached to the lid cover 15 by engaging the attachment / detachment hook 61 with the locking piece 62 provided on the lid cover 15. The lower member 56 is provided with a pair of annular connected portions 63 and a projecting piece 64 projecting in a rectangular shape.

As shown in FIGS. 1, 3, 11, 13, 13 and the like, the upper member 57 is provided with a steam discharge port 24 for discharging steam from the gas-liquid separation space S2 to the outside. As shown in FIG. 11 and the like, the upper member 57 is provided with a detour wall 65 for detouring the oneba introduced from the introduction hole 58 so as not to directly go to the steam discharge port 24. The detour wall 65 extends downward to the vicinity of the upper end of the peripheral wall 81. The upper member 57 includes a pair of fixed hooks 66 hooked on the corresponding connected portion 63, and a swing hook 67 hooked on the projecting piece 64.

As shown in FIGS. 11, 15 to 18, etc., the oneva separation unit 25 is operated by an introduction hole 58 for introducing a steam flow and a steam flow attached to the introduction hole 58 and passing through the introduction hole 58 to generate steam. A small foam member 68 is provided to reduce the oneva foam contained in the flow. The vesicle member 68 is made of an elastic material.

As shown in FIGS. 15 to 18, the vesicle member 68 is provided with a shaft portion 69 guided along the flow direction of the steam flow and a shaft portion 69 provided at the tip of the shaft portion 69 to cover the introduction hole 58. A possible first covering 70 is provided. The shaft portion 69 is supported by a shaft support portion 75 provided on the lower member 56. The shaft portion 69 is provided with a diameter-expanded portion 82 whose diameter is larger than that of other portions. The small foam member 68 is formed by elastically deforming the diameter-expanded portion 82 and inserting it into the shaft support portion 75, and sandwiching the shaft support portion 75 between the first covering portion 70 and the diameter-expanded portion 82. Attached to. That is, the vesicle member 68 is detachably attached to the lower member 56.

As shown in FIGS. 15 and 16, the shaft support portion 75 is supported by the wall surface of the introduction hole 58. The introduction hole 58 is divided into, for example, four (plural) small holes 58A by the shaft support portion 75. The small hole 58A has a fan shape. Therefore, among the oneva bubbles contained in the steam flow, those larger than the small holes 58A are crushed and made into small bubbles. Therefore, in the introduction hole 58, the vesicles are reduced in two stages, the small holes 58A and the first covering portion 70 of the vesicle member 68.

As shown in FIGS. 15, 16, 19, 19 and the like, when the small foam member 68 is erroneously attached to the first covering portion 70, a fluid passes between the gas-liquid separation space S2 and the rice cooking space S1. A first spacer 71 is provided to secure a space to be used. Four (plural) first spacers 71 are provided with a gap in the circumferential direction.

The oneva separation unit 25 has a return hole 59 for returning the oneva from the gas-liquid separation space S2 toward the rice cooking space S1 and a return hole 59, and a steam flow flows from the return hole 59 into the gas-liquid separation space S2. The inflow prevention member 72 and the inflow prevention member 72 are provided.

As shown in FIGS. 17 to 20 and the like, the inflow prevention member 72 is arranged coaxially with the vesicle reducing member 68. The inflow prevention member 72 is made of an elastic material. The inflow prevention member 72 is provided with a second covering portion 73 capable of covering the return hole 59. Further, the inflow prevention member 72 is provided with a pair of guide shaft portions 88. Each guide shaft portion 88 is inserted and attached to the corresponding mounting hole portion 89 in the lower member 56 while being elastically deformed. That is, the inflow prevention member 72 is detachably attached to the lower member 56. Further, the inflow prevention member 72 is provided with a through hole 90 having substantially the same diameter as the introduction hole 58.

As shown in FIGS. 14 and 20, the second covering portion 73 secures a space through which the fluid passes between the gas-liquid separation space S2 and the rice cooking space S1 when the inflow prevention member 72 is erroneously attached. A second spacer 74 is provided. Four (plural) second spacers 74 are provided with a gap in the circumferential direction.

As shown in FIGS. 11 and 17, during pressure rice cooking, the small foaming member 68 is pushed up by the steam flow introduced from the introduction hole 58 into the gas-liquid separation space S2 during pressure rice cooking. The shaft portion 69 moves until the enlarged diameter portion 82 hits the shaft support portion 75. The steam flow flows into the gas-liquid separation space S2 through the gap between the first covering portion 70 and the peripheral wall 81. The gap between the first covering portion 70 and the peripheral wall 81 is smaller than the opening area of the small hole 58A. Therefore, onee bubbles larger than the gap between the first covering portion 70 and the peripheral wall 81 do not flow into the gas-liquid separation space S2. Further, since the small foam member 68 is depressed by its own weight so as to close the space between the first covering portion 70 and the peripheral wall 81, the first covering portion 70 is in a state of fluttering, which also causes the first covering portion 70 to be in a fluttering state. , Oneva bubbles can be crushed efficiently. At this time, the return hole 59 is closed by the inflow prevention member 72, and the steam flow does not flow into the gas-liquid separation space S2 from the return hole 59.

Further, as shown in FIGS. 11 and 18, when the pressure rice cooking is completed, the oneba stored in the gas-liquid separation space S2 flows down due to its own weight, and the return hole 59 and the second covering portion 73 of the inflow prevention member 72 It flows through the upper surface to the onee return surface 51 side of the steam path P, and returns to the rice cooking space S1 through the pressure adjusting hole of the pressure adjusting portion 29.

[Countermeasures against erroneous mounting of small foam members]
The small foam member 68 is attached to the lower member 56 so as to sandwich the shaft support portion 75 between the first covering portion 70 and the diameter expanding portion 82. As shown in FIGS. 11, 15, 17, 18, 18, etc., when properly mounted, the first covering portion 70 is mounted in a posture close to the center side of the gas-liquid separation space S2. However, since the small foam member 68 is made of an elastic material, it is assumed that the user may mistakenly attach it at the time of maintenance.

For example, as shown in FIG. 19, the small foaming member 68 is attached in a reverse posture in which the first covering portion 70 is far from the center side of the gas-liquid separation space S2, and the inflow prevention member 72 is returned from there. It may be in the first erroneously mounted state attached to the hole 59. However, in this case, as can be understood from FIGS. 16 and 19, the first spacer 71 of the vesicle reducing member 68 betweens the first covering portion 70 and the second covering portion 73 of the inflow prevention member 72. A gap that allows the passage of the fluid is secured, and a path through which the fluid passes through the return hole 59 and the through hole 90 of the inflow prevention member 72 can be secured. Therefore, when the pressure of the rice cooking space S1 side is reduced from the pressurized state to the atmospheric pressure side, the pressure of the rice cooking space S1 can be released to the outside through the gas-liquid separation space S2 and the steam discharge port 24.

That is, the first spacer 71 is the first cover in the first erroneous mounting state in which the shaft portion 69 is mounted in the opposite direction to the shaft support portion 75 and then the inflow prevention member 72 is mounted on the small foam member 68. A gap through which a fluid can flow is secured between the portion 70 and the second covering portion 73.

Further, for example, as shown in FIG. 20, after the inflow prevention member 72 is attached to the return hole 59, the small foaming member 68 is placed in the opposite direction in which the first covering portion 70 is far from the center side of the gas-liquid separation space S2. It may be in the second erroneous mounting state when mounted in a posture. However, even in this case as well, as can be understood from FIGS. 14 and 20, the fluid passes between the second covering portion 73 and the first covering portion 70 by the second spacer 74 of the inflow prevention member 72. A gap is secured to allow the fluid to pass through the introduction hole 58 and the through hole 90. Therefore, when the pressure of the rice cooking space S1 side is reduced from the pressurized state to the atmospheric pressure side, the pressure of the rice cooking space S1 can be released to the outside through the gas-liquid separation space S2 and the steam discharge port 24.

That is, the second spacer 74 is in a second erroneously mounted state in which the inflow prevention member 72 is mounted with the inflow prevention member 72 and then the shaft portion 69 of the vesicle reducing member 68 is mounted with the shaft support portion 75 in the opposite direction. A gap through which a fluid can flow is secured between the first covering portion 70 and the second covering portion 73.

Hereinafter, another embodiment in which the present embodiment has been modified will be described. Each embodiment can be appropriately combined as long as there is no contradiction. The scope of the present invention is not limited to the contents shown in each embodiment. That is, the scope of the present invention also includes equivalents of the elements in each embodiment.

(1) In the above embodiment, an example is provided in which two locking structures 35 are provided, but the present invention is not limited to this. For example, only one locking structure 35 may be provided. Further, three or more locking structures 35 may be provided. Further, one or three or more other locking structures 91 may be provided.

(2) In the above embodiment, the one in which the protrusion 37 is provided on the protective frame 8 is exemplified, but the present invention is not limited to this. For example, the protrusion 37 may be provided on the shoulder member 9 that is integrally fixed to the protective frame 8. That is, the protrusion 37 may be provided on a member (protection frame 8 side) that is integrally fixed to the protection frame 8.

(3) In the above embodiment, the protrusion 37 on the protective frame 8 side has a substantially U-shape, and the pressed protrusion 36 on the main body case 6 side has a substantially triangular shape. Not limited. For example, the protrusion 37 on the protective frame 8 side may have a substantially triangular shape, and the pressed protrusion 36 on the main body case 6 side may have a substantially U-shape.

(4) In the above embodiment, the resin boss structure 38 exemplifies a structure that has not been screwed in advance, but the resin boss structure 38 is not limited to this. For example, a guide groove having a diameter smaller than the nominal diameter D2 of the screw 39 may be previously screwed into the inner portion 42.

(5) In the above embodiment, the resin boss structure 38 is exemplified in that the inner portion 42 is formed so as to become wider from the radial inner side to the radial outer side, but the present invention is limited to this. do not have. For example, the inner portion 42 may be formed to have the same width regardless of the radial position. Further, the inner portion 42 may be formed so as to become narrower from the inner side in the radial direction to the outer side in the radial direction.

(6) In the above embodiment, an example is provided in which four gaps 44 are provided, but the present invention is not limited to this. For example, the gap 44 may be provided with two, three, or five or more. Also in this case, if the gap portions 44 are provided at equal intervals along the circumferential direction, it is preferable that the force is applied evenly at each location of the inner portion 42.

(7) In the above embodiment, in the resin boss structure 38, the cylinder inner diameter D1 of the outer cylinder portion 41 is smaller than the nominal diameter D2 of the screw 39, but the present invention is not limited to this. For example, in the resin boss structure 38, the cylinder inner diameter D1 of the outer cylinder portion 41 may be the same as the nominal diameter D2 of the screw 39 or larger than the nominal diameter D2 of the screw 39. In this case, since the screw 39 is hooked on the inner surface of the outer cylinder portion 41, the fastening force can be increased.

(8) In the above embodiment, the resin boss structure 38 is provided on the back surface of the plate-shaped portion 43 of the Mayban member 16, but the present invention is not limited to this. For example, it may be integrally molded with a resin molded product other than the Mayban member 16 in the “rice cooker”. In addition to the "rice cooker", the resin boss structure 38 can be applied to a part of other cooking cookers such as an electric kettle, a hot plate, and a bakery. Such a resin boss structure 38 is particularly applicable to a thin-walled resin molded product that constitutes a part of the exterior material E, and is suitably applied to a portion where sink marks are not desired to occur on the surface portion that appears in the appearance.

(9) In the above embodiment, the screw 39 is exemplified as the "male screw member", but the screw 39 is not limited to this. For example, it may be another "male screw member" such as a screw or a bolt.

(10) In the above embodiment, in the pressure type rice cooker 1, as a portion constituting the steam path P, a oneva return surface 51 having a downward gradient from the oneeva separation unit 25 side toward the pressure adjusting portion 29 side is provided. It exemplifies what is being done, but is not limited to this. For example, such a oneva return surface 51 may not be provided.

(11) In the above embodiment, the vesicle member 68 having a substantially T-shaped cross section in a side view is exemplified, but the present invention is not limited to this. For example, the vesicle-forming member 168 having a different structure as shown in FIGS. 21 to 23 may be used. A pair of guide shaft portions 188 are attached to the vesicle reducing member 168. The small foam member 168 also has an inflow prevention function of preventing the steam flow from flowing into the gas-liquid separation space S2 from the return hole 59. In another structure shown in FIGS. 21 to 23, the size of the introduction hole 158 is larger than that of the above embodiment. A cantilever valve body 201 is provided in the middle of the tubular portion 200 through which the steam flow passes in the vesicle member 168, and the valve body 201 is fluttered by the steam flow during rice cooking. It operates in this manner and destroys the oneva bubbles introduced into the gas-liquid separation space S2 to make them smaller. That is, even in this separate structure, the small foam member 168 is configured to reduce the oneva foam by being pushed by the steam flow and changing the state.

(12) In the above embodiment, the vesicle member 68 is exemplified by being made of an elastic material, but the present invention is not limited to this. For example, the vesicle member 68 may be made of a non-elastic material such as a hard resin.

(13) In the above embodiment, the inflow prevention member 72 is exemplified by being made of an elastic material, but the present invention is not limited to this. For example, the inflow prevention member 72 may be made of a non-elastic material such as a hard resin.

(14) In the above embodiment, the one that the oneva separation unit 25 is removable from the lid cover 15 is exemplified, but the present invention is not limited to this. For example, the Oneva separation unit 25 may be integrally formed with the lid cover 15 so as not to be removable.

(15) In the above embodiment, as an example of the "rice cooker", the heating method is an IH method, but the heating method is not limited to this. For example, the heating method may be a sheathed heater method or a gas type “rice cooker”.

(16) In the above embodiment, the pressure type rice cooker 1 is illustrated as an example of the "rice cooker", but the present invention is not limited to this. For example, it may be a normal rice cooker of a type that does not apply a pressure higher than the atmospheric pressure.

15: Cover cover (separate member)
16: Mayban member (resin molded product)
38: Resin boss structure 39: Screw (male screw member)
40: Screw shaft part 41: Outer cylinder part 42: Inner part 43: Plate-shaped part 44: Gap part 45: Hanging part D1: Cylinder inner diameter D2: Nominal diameter E: Exterior material

Claims (5)

It has a resin boss structure in which a male screw member is screwed in to fix another member.
An outer cylinder portion that can support the screw shaft portion of the male screw member and is erected on a plate-shaped portion, and
An inner portion integrally formed inside the outer cylinder portion is provided.
A hooking portion on which the male screw member is hooked and a gap portion formed between the hooking portions in the circumferential direction are provided on the inner portion.
A resin boss structure in which reinforcing ribs are erected at a boundary between the root of the outer cylinder portion and the plate-shaped portion and corresponding to the radial outer side of the gap portion . The resin boss structure according to claim 1, wherein a plurality of the gaps are provided at equal intervals along the circumferential direction. The resin boss structure according to claim 1 or 2, wherein the inner diameter of the outer cylinder portion is larger than the nominal diameter of the male screw member. The resin boss structure according to any one of claims 1 to 3, wherein the hooking portion is formed so as to become wider in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction. A resin molded product in which the resin boss structure according to any one of claims 1 to 4 is integrally formed on the back surface of the plate-shaped portion as an exterior material.

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