JP7323772B2 - bathtub lid - Google Patents

Description

The technology disclosed in the present application relates to a bathtub lid placed on the bathtub to open and close the bathtub.

2. Description of the Related Art As a conventional bathtub cover, the one disclosed in Japanese Patent No. 4113181 (Patent Document 1) is known. Patent Literature 1 discloses a bathtub lid having two decorative boards extending facing each other with a core material sandwiched therebetween, and a warp prevention member disposed between the core material and each decorative board. there is The bathtub cover disclosed in this document is supposed to be able to prevent warping by forming the warp prevention member using a material with a small coefficient of thermal expansion.

Furthermore, as another conventional bathtub lid, there is known one disclosed in Japanese Patent No. 5962962 (Patent Document 2). Patent Document 2 discloses a bathtub lid formed so as to suppress the amount of thermal expansion on the diagonal line of the lower surface. In such a bathtub lid, the lower surface facing the bathtub is warped by the heat in the bathtub so as to be in close contact with the rectangular inner edge of the bathtub, thereby suppressing the escape of the heat in the bathtub to the outside. is assumed to be possible.

Patent Document 1 and Patent Document 2 are hereby incorporated by reference in their entirety.

Japanese Patent No. 4113181 Japanese Patent No. 5962962

Bathtub lids generally need to address the problem that the top and bottom surfaces warp due to exposure to the low temperatures of the bathroom and the high temperatures within the bathtub, respectively. Regarding this problem, the bathtub lid described in Patent Document 1 employs a configuration in which a warp prevention member made of a material having a small coefficient of thermal expansion is separately provided, so there is a further problem that the weight and manufacturing cost increase. have

Furthermore, the bathtub lid described in Patent Document 2 is intended not to prevent warping itself, but to warp so as to eliminate the gap between the bathtub lid and the bathtub. Therefore, Cited Document 2 does not disclose any technique for suppressing warping of the bathtub lid.

Accordingly, various embodiments provide a bathtub lid that can at least partially resist warping due to thermal expansion through novel constructions.

A bathtub lid according to one aspect includes a first member formed in a substantially plate shape, and a distance between the first member along a reference direction from the outer edge of the first member toward the center. a second member formed with at least one decreasingly extending curved portion and extending opposite the first member with a core material interposed therebetween. .

According to various embodiments, a novel configuration can provide a tub lid that can at least partially resist warping due to thermal expansion.

FIG. 1 is a perspective view showing an example of the configuration of a bathtub system using a bathtub lid according to one embodiment. FIG. 2 is a perspective view showing an example of the configuration of the bathtub lid 20 according to the embodiment shown in FIG. FIG. 3 is a cross-sectional view of the bathtub lid 20 shown in FIG. 2 along line III-III. FIG. 4 is a cross-sectional view showing a specific example of the shape of the end surface of the bathtub lid 20 shown in FIG. FIG. 5 is a plan view showing an example of the configuration of a bathtub lid 20 according to another embodiment.

Various embodiments of the present invention will now be described with reference to the accompanying drawings. In addition, the same reference numerals are attached to common components in the drawings. Also, it should be noted that components depicted in one drawing may be omitted in another drawing for convenience of explanation. Furthermore, it should be noted that the attached drawings are not necessarily drawn to scale.

1. Configuration of Bathtub System FIG. 1 is a perspective view showing an example of the configuration of a bathtub system using a bathtub lid according to one embodiment. As shown in FIG. 1, bathtub system 1 may include bathtub 10 and bathtub lid 20 .

The bathtub 10 is any bathtub, including conventional bathtubs, and may have, for example, a box shape, as shown in FIG. The bathtub 10 can be made of any material selected from the group including, but not limited to, fiberglass reinforced plastic (FRP), enamel, stainless steel, marble, wood, tile, and combinations thereof.

The bathtub 10 also includes a storage part 14 that can store hot or cold water and communicates with the outside of the bathtub 10 through the opening 12, and an upper surface ( mounting surface) 16; The upper surface 16 may be, for example, substantially entirely formed of a smooth flat surface and formed of a smooth curved surface at a portion connected to the surface surrounding the housing portion 14 . Note that one or more magnets (not shown) may be embedded in the top surface 16 of the bathtub 10 in order to detachably fix the bathtub lid 20 to the bathtub 10 (see "2- 3” section later.)

Next, the bathtub lid 20 can be used alone, or can be used in combination with one or more other bathtub lids. In one embodiment, tub lid 20 is used in combination with another tub lid 22, for example, as shown in FIG. In this case, the bathtub lid 20 and the bathtub lid 22 cooperate with each other to substantially completely cover the opening 12 and the container 14 of the bathtub 10 when placed adjacent to each other on the upper surface 16 of the bathtub 10. can be formed to be sized to allow

In one embodiment, as illustrated in FIG. 1, tub lid 20 and tub lid 22 may have substantially the same shape and size. In one embodiment, each of tub lid 20 and tub lid 22 may have the following sizes and the like.
Dimensions: about 750mm (width) x about 750mm (depth) x 15mm (thickness)
Weight: about 1550g

Alternatively, in another embodiment, tub lid 20 and tub lid 22 may have different shapes and sizes.

On the other hand, when the bathtub lid 20 is used alone, the bathtub lid 20 can substantially completely cover the opening 12 and the housing 14 of the bathtub 10 when placed alone on the upper surface 16 of the bathtub 10. can be formed to be as large as possible.

2. Configuration of Bathtub Lid 20 (Bathtub Lid 22) FIG. 2 is a perspective view showing an example of the configuration of the bathtub lid 20 according to the embodiment shown in FIG. FIG. 3 is a cross-sectional view of the bathtub lid 20 shown in FIG. 2 along line III-III.

The bathtub lid 20 can be formed in a substantially rectangular shape as a whole, for example. At least one of a plurality of corners of the bathtub lid 20, which has a substantially rectangular shape as a whole, may have a shape extending in an arc or a shape extending in an inclined straight line. FIG. 2 shows, as an example, a bathtub lid 20 in which one corner exhibits a shape _S1 extending in an arc shape and another corner presents a shape _S2 extending in an inclined straight line.

As best shown in FIG. 3, the bathtub lid 20 is roughly divided into a first member 100 formed in a substantially plate shape and a second member 200 extending facing the first member 100. and a core material 300 disposed between the first member 100 and the second member 200 .

(1) First member 100
The substantially plate-shaped first member 100 can be formed in a substantially rectangular shape as a whole, for example, in plan view. At least one of a plurality of corners of the first member 100 having a substantially rectangular shape as a whole may have a shape extending in an arc or a shape extending in an inclined straight line. FIG. 2 shows, as an example, a first member 100 having one corner extending in an arc shape and another corner extending in an inclined linear shape.

The first member 100 can be made of, for example, a material selected from a group including, but not limited to, polypropylene, engineering plastics, olefinic resins, and combinations thereof.

(2) Second member 200
Referring to FIGS. 2 and 3, the substantially plate-shaped second member 200 can be formed into, for example, a substantially rectangular shape in a plan view as a whole. A shape in which at least one of a plurality of corners of the second member 200, which has a substantially rectangular shape as a whole, extends in an arc shape or a shape in which at least one corner extends in an inclined straight line shape so as to match the shape of the first member 100 may be present.

The second member 200 can be broadly divided into a base portion 210 and an outer edge portion 220 that is continuously connected to the base portion 210 and extends surrounding the base portion 210 .
First, the base 210 includes at least one curved portion 230 extending from the central portion C of the second member 200 toward the outer edge portion 220 of the second member 200 (one curved portion 230 is shown in FIGS. 2 and 3 as an example). is shown) and a flat portion 240 continuously connected to the curved portion 230 and extending around the curved portion 230 .

The curved portion 230 is aligned with the first member 100 along a reference direction D from the outer edge 220 of the second member 200 toward the center C of the second member 200, as best shown in FIG. It extends curvedly to reduce the distance. Here, since the central portion C of the second member 200 and the central portion C of the first member 100 are substantially aligned, the reference direction D extends from the outer edge portion 110 of the first member 100 to the first member. It corresponds to the direction toward the center C of 100 .

Curved portion 230 may, in one embodiment, extend in a dome shape as illustrated in FIG. Therefore, a boundary B between the curved portion 230 and the flat portion 240 surrounding the curved portion 230 has a substantially circular shape as shown in FIG. Note that the curved portion 230 is not limited to extending in a dome shape, and may have any shape as long as the distance between it and the first member 100 is reduced along the reference direction D. may Also, the boundary B between the curved portion 230 and the flat portion 240 surrounding the curved portion 230 does not need to have a substantially circular shape, and may have any shape.

The curved portion 230 is curved so as to decrease the distance from the first member 100 along the reference direction D from the outer edge portion 110 of the first member 100 toward the central portion C of the first member 100. It is sufficient if it has an extending portion, and some of the portions include a portion extending substantially parallel to the first member 100 and/or a portion curved so as to increase the distance from the first member 100 along the reference direction D. etc. may be included. Furthermore, the curved portion 230 does not necessarily need to extend from the position facing the outer edge portion 110 of the first member 100 to the position facing the central portion C of the first member 100 .

The flat portion 240 can have a plane that extends substantially parallel to the first member 100 . In the example shown in FIG. 2, almost all portions of the flat portion 240 extend substantially parallel to the first member 100, but the flat portion 240 is It may include a portion extending so as to incline.

The flat portion 240 has a portion that extends substantially parallel to the first member 100 (that is, to the top surface 16 of the bathtub 10 shown in FIG. When it is placed on the top surface 16, it can come into surface contact with the upper surface 16. In this sense, it is preferable that the area of the flat portion 240 is larger, but it is not essential to provide the flat portion 240.

Next, the outer edge 220 can be continuous with the base 210 and extend in a direction bent with respect to the base 210 . (End of) outer edge 220 is continuously coupled to (end of) outer edge 110 of first member 100 .

In the example shown in FIG. 3, the outer edge portion 220 of the second member 200 forms the end face of the bathtub lid 20 extending in the direction intersecting the extending direction of the first member 100. In the example shown in FIG. Generally speaking, at least one of the outer edge portion 200 of the second member 200 and the outer edge portion 110 of the first member 100 can form the end surface of the bathtub lid 20 .

FIG. 4 is a cross-sectional view showing a specific example of the shape of the end surface of the bathtub lid 20 shown in FIG. As shown in FIG. 4(a), the end face of the bathtub lid 20 is formed by a plane extending substantially perpendicular to the base 210 of the second member 200 (or the first member 100). good. Further, as shown in FIG. 4(b), the end surface of the bathtub lid 20 is formed by a plane extending at an angle of approximately 45 degrees with respect to the base 210 of the second member 200 (or the first member 100). may be formed. Furthermore, as shown in FIG. 4(c), the end surface of the bathtub lid 20 may be formed by a curved surface having a substantially C-shaped cross section.

4(a) to 4(c), the end surface of the bathtub lid 20 extending in the direction intersecting with the extending direction of the first member 100 is the outer edge of the first member 100. 110 and/or the outer edge 220 of the second member 200 . 4(a) to 4(c) show an example in which the end surface of the bathtub lid 20 is formed by a flat surface or a curved surface. It may be formed by

The second member 200 having the configuration described above can be made of, for example, a material selected from a group including, but not limited to, polypropylene, engineering plastics, olefinic resins, and combinations thereof. The second member 200 may be made of the same material as or different from that of the first member 100 .

(3) Core material 300
Returning to FIG. 3, between the first member 100 and the second member 200, a core member 300 extending facing the first member 100 and the second member 200 is arranged. The core material 300 can be welded to the first member 100 on the surface facing the first member 100 and welded to the second member 200 on the surface facing the second member 200 .

Further, the core material 300 has a curved region along each of at least one curved portion formed in the second member 200 (only the curved portion 230 in FIG. 3) on the surface facing the second member 200. (area 310 in FIG. 3). On the other hand, since the surface facing the first member 100 is formed so that the first member 100 extends substantially flat, the core member 300 extends flat along the first member 100. It can have a region 320 .

Furthermore, the core member 300 may be formed so as to form a space G between the end surface (the inner surface thereof) of the bathtub lid 20 and the end surface 330 of the core member 300 . The end surface of the bathtub lid 20 referred to here can be formed by at least one of the outer edge portion 110 of the first member 100 and the outer edge portion 220 of the second member 200, as described above. This space G has a width _G1 of about 10 mm along the reference direction D between the outermost portion of the end surface (the inner surface thereof) of the bathtub lid 20 and the end surface 330 of the core member 300. preferable. In this case, the end face 330 of the core 300 is preferably positioned outside the opening 12 of the bathtub 10, that is, above the upper surface 16 of the bathtub 10 when the bathtub lid 20 is placed on the bathtub 10. . Such a space G can be similarly formed even when the bathtub lid 20 has end faces as shown in FIGS. 4(a) to 4(c).

Furthermore, the surface of the core material 300 facing the second member 200 (alternatively or in addition to this, the surface facing the first member 100) is preferably the second member 200 At least one magnet (not shown) may be embedded in the surface facing the flat portion 240 of . As a result, when the bathtub lid 20 is placed on the bathtub 10 shown in FIG. ) is attracted to (or attracts) a placed magnet. Therefore, the combination of at least one magnet embedded in the core 300 and at least one magnet embedded in the top surface 16 of the bathtub 10 allows the bathtub lid 20 to be detachably fixed to the top surface 16 of the bathtub 10 (bathtub The lid 20 is less likely to warp by being fixed to the upper surface 16 of the bathtub 10).

Instead of embedding a magnet in both the bathtub lid 20 (core material 300) and the bathtub 10, a ferromagnetic material (iron, nickel, cobalt, ferrite, etc.) is embedded in the bathtub lid 20 (core material 300). A configuration in which a magnet is embedded in 10 or a configuration in which a magnet is embedded in bathtub lid 20 (core material 300) and a ferromagnetic material is embedded in bathtub 10 can also be adopted.

Furthermore, it is also possible to employ a configuration in which magnets are embedded in both the bathtub lid 20 (core material 300) and the bathroom wall (not shown). Instead of this, a ferromagnetic material (iron, nickel, cobalt, ferrite, etc.) is embedded in the bathtub lid 20 (core material 300), and a magnet is embedded in the bathroom wall, or the bathtub lid 20 (core material 300) It is also possible to employ a configuration in which the magnet is embedded and the ferromagnetic material is embedded in the bathroom wall. As a result, when the bathtub lid 20 is leaned against the wall of the bathroom, the magnet or ferromagnetic material of the bathtub lid 20 is attracted to the magnet embedded in the wall of the bathroom, or the magnet of the bathtub lid 20 By being attracted to a magnet or ferromagnetic material embedded in the wall of the bathroom, the bathtub cover 20 can be fixed without tipping over.

The core material 300 having the above configuration is, for example, a polyolefin that is a homopolymer or copolymer of olefins such as ethylene, propylene, butene, isoprenepentene, and methylpentene (e.g., polypropylene (foamed polypropylene), high-density polyethylene, etc.). ), polyamide, polystyrene, polyvinyl chloride, polyacrylonitrile, acrylic derivatives such as ethylene-ethyl acrylate copolymer, polycarbonate, vinyl acetate copolymer such as ethylene-vinyl acetate copolymer, ionomer, ethylene-propylene-diene terpolymers such as, but not limited to, thermoplastic resins such as ABS resins, polyolefin oxides, polyacetals, and combinations thereof.

3. Operation of bathtub cover 20 Next, the operation of the bathtub cover 20 when the bathtub cover 20 having the above structure is used in combination with the bathtub 10 containing hot water will be described.

Referring to the bathtub lid 20 illustrated in FIG. 3 , the bathtub lid 20 is placed on the bathtub 10 with the second member 200 facing the housing portion 14 and the upper surface 16 of the bathtub 10 . According to such a positional relationship, the first member 100 is exposed to the temperature of the bathroom (for example, about 5° C. to 30° C.), and the second member 200 is exposed to the hot water contained in the container 14 of the bathtub 10. (for example, about 40° C.).

In such an environment, the second member 200 is exposed to higher temperatures than the first member 100, so the volume increased by the thermal expansion of the second member 200 is less than that of the first member 100. It becomes larger than the volume increased by thermal expansion.

If the curved portion 230 were not provided in the second member 200 , most escape routes of the thermally expanded second member 200 would exist in the outer edge portion 220 . Therefore, when the outer edge portion 220 presses the outer edge portion 110 of the first member 100, the first member 100 is bent downward in the plane of FIG. It may be curved.

On the other hand, when the curved portion 230 is provided in the second member 200, the thermally expanded curved portion 230 increases its volume mainly along the direction _D1 approaching the storage portion 14 of the bathtub 10. can be done. That is, the bending portion 230 can be retracted by expanding mainly in the direction _D1 . As a result, the amount by which the outer edge portion 220 of the second member 200 presses against the outer edge portion 110 of the first member 100 can be suppressed, so that the phenomenon of bending the first member 100 into an arc can be suppressed. can.

In order to more effectively suppress the phenomenon in which the first member 100 is curved, the temperature of hot water contained in the containing portion 14 of the bathtub 10, the temperature of the bathroom, the size and material of the second member 200, and It is preferable to design the total number of curved portions 230, the size of each curved portion, the degree of curvature, etc., in consideration of various conditions including the size and material of the first member 100, and the like.

4. Variation In the embodiment shown in FIG. 2, the second member 200 is provided with only a single curved portion 230 . Alternatively, the second member 200 may be provided with multiple curved portions.

FIG. 5 is a plan view showing an example of the configuration of a bathtub lid 20 according to another embodiment. As illustrated in FIG. 5, the second member 200 is formed with a plurality of curved portions.

The end faces of the bathtub lid 20 illustrated in FIG. 5 are divided into a first corner 500A, a second corner 500B (adjacent to the first corner 500A), and a third corner (adjacent to the second corner 500B). corner 500C, fourth corner 500D (adjacent to third corner 500C), fifth corner 500E (adjacent to fourth corner 500D), and sixth corner (adjacent to fifth corner 500E). corner 500F of the .

The end face of the bathtub lid 20 has a first region 510A extending between the first corner 500A and the second corner 500B and a second region extending between the second corner 500B and the third corner 500C. 510B, a third region 510C extending between the third corner 500C and the fourth corner 500D, a fourth region 510D extending between the fourth corner 500D and the fifth corner 500E, and a fifth region 510E extending between the fifth corner 500E and the sixth corner 500F.

The second member 200 includes, for example, a first curved portion 520 extending along the first region 510A, a second curved portion 522 extending along the second region 510B, and a third curved portion 522 extending along the third region 510C. a third curved portion 524 extending along a fourth region 510D; a fourth curved portion 526 extending along a fourth region 510D; and a fifth curved portion 528 extending along a fifth region 510E.

Although not shown in FIG. 5, any of the first curve 520, the second curve 522, the third curve 524, the fourth curve 526, and the fifth curve 528 , as described above with reference to FIG. extends to decrease the distance of

Furthermore, each curved portion may be configured to be surrounded by a flat portion 530 extending substantially parallel to the first member 100 . Furthermore, each curved portion may be formed in an arbitrary shape including a generally rectangular shape in plan view, a polygonal shape in plan view, a circular shape in plan view, an elliptical shape in plan view, and the like. In the example illustrated in FIG. 5, the fourth curved portion 526 is formed in a circular shape in plan view, and the remaining curved portions are formed in a rectangular shape in plan view.

In the embodiment illustrated in FIG _. 5, similarly to the embodiment illustrated in FIG. ) can be increased in volume. That is, each curved portion can be retracted by expanding mainly in the direction _D1 . As a result, the amount by which the outer edge portion 220 of the second member 200 presses against the outer edge portion 110 of the first member 100 can be suppressed, so that the phenomenon of bending the first member 100 into an arc can be suppressed. can.

Further, in the various embodiments described above, the case where (the end of) the outer edge 110 of the first member 100 and (the end of) the outer edge 220 of the second member 200 are coupled has been described. Alternatively, the outer edge portion 110 (the end portion) of the first member 100 and the outer edge portion 220 (the end portion) of the second member 200 are not directly coupled, and the first member 100 is The outer edge portion 110 (the edge portion) and the outer edge portion 220 (the edge portion) of the second member 200 are separated with the core material 300 sandwiched therebetween, and the outer edge portion 110 (the edge portion) of the first member 100 is separated. A protective member (so-called “edge protector”), not shown, may be provided that covers and couples (the end of) the outer edge 220 of the second member 200 and (the end of) the core material 300 . . Such a protective member may extend annularly to form the end face of the tub lid 20 .

Even in this case, each curved portion formed in the second member 200 causes the first member 100 to bow when the second member 200 thermally expands more than the first member 100 . It is possible to suppress the phenomenon of being curved into a shape. Specifically, if the curved portion is not formed in the second member 200 , the outer edge portion 220 of the second member 200 is bent through the protective member (edge protector) and the core material 300 . Pressing on the outer edge 110 of one member 100 can cause the first member 100 to bow. However, if the second member 200 is provided with a curved portion, the thermally expanded curved portion can expand and retreat mainly in the direction _D1 , as described above. As a result, the phenomenon of bending the first member 100 in an arc can be suppressed.

5. Method for Manufacturing Bathtub Lid 20 Next, a method for manufacturing the tub lid 20 will be briefly described.
The bathtub lid 20 according to the various embodiments described above can be manufactured using, for example, one-piece molding.

First, in a first step, a first mold in which a first cavity having a substantially flat first surface is formed, and the above mold along a reference direction from the outer edge to the center of the first surface. a second mold defining a second cavity having a second surface including at least one curved portion extending to reduce the distance between the first surface and the second mold; be. Each of the at least one curved portion has a shape along the shape of each curved portion illustrated in FIGS. 2 and 5 and the like.

In the second step, a molten first resin sheet and a molten second resin sheet are placed between the first mold and the second mold. The first resin sheet is formed of the material of the first member 100 described in the above section "2(1)", and the second resin sheet is the material described in the above section "2(2)". It is formed of the material of the second member 200 .

In a third step, the molten second resin sheet facing the second mold is shaped along the second mold. As a result, the shaped second resin sheet forms the second member 200 illustrated in FIG. 3 and the like.

In a fourth step, the molten first resin sheet facing the first mold is shaped along the first mold. As a result, the shaped second resin sheet forms the first member 100 illustrated in FIG. 3 and the like. Note that the fourth step may be executed after the third step.

In a fifth step, an integrally molded core (ie, core 300 having the shape illustrated in FIG. 3, etc.) is prepared. The core material has a shape slightly smaller than the region so as to be securely accommodated in the region between the shaped first resin sheet and the shaped second resin sheet. (As a result, in the completed bathtub lid 20, as illustrated in FIG. 3, a gap may occur).

In the sixth step, in a state in which the core material 300 is arranged between the first resin sheet and the second resin sheet, at least one of the first mold and the second mold is By moving one side and bringing the first mold and the second mold close to each other, the end of the first resin sheet and the end of the second resin sheet are integrated. . As a result, the bathtub lid 20 illustrated in FIGS. 2 and 3 is formed.

6. Various Aspects A bathtub cover according to a first aspect includes a first member formed in a substantially plate shape, and a first member along a reference direction from the outer edge of the first member toward the center. a second member formed with at least one curved portion extending to reduce the distance between the It is equipped.

According to this aspect, when the at least one curved portion formed in the second member thermally expands, it retracts in a direction that intersects the reference direction and separates from the first member (the direction in which the curve is eliminated). Therefore, it is possible to suppress the phenomenon that the end of the outer edge of the second member presses the end of the outer edge of the first member to bend the first member in an arcuate shape.

A bathtub lid according to a second aspect is the bathtub lid according to the first aspect, wherein the core material is welded to the first member and the second member.

According to this aspect, the core material can support and protect the first member and the second member by being in close contact with the first member and the second member.

A bathtub lid according to a third aspect is, in the first aspect or the second aspect, wherein the outer edge portion of the first member and the outer edge portion of the second member are joined. be.

According to this aspect, since it is not necessary to provide a separate member for joining the outer edge portion of the first member and the outer edge portion of the second member, it is possible to reduce the mass and manufacturing cost of the bathtub cover.

A bathtub lid according to a fourth aspect is the bathtub lid according to the third aspect, wherein at least one of the outer edge portion of the first member and the outer edge portion of the second member is an extension of the first member. It forms an end face of the bathtub lid extending in a direction intersecting the installation direction.

A bathtub cover according to a fifth aspect is the bathtub lid according to the fourth aspect, wherein the end surface includes at least one of a flat surface and a curved surface.

According to these aspects, the edge of the bathtub lid may be formed by either one or both of the outer edge of the first member and the second outer edge. It is possible to increase the degree of freedom in connection with the outer edge of the two members, thus increasing the degree of freedom in manufacturing the bathtub lid.

A bathtub lid according to a sixth aspect is the bathtub lid according to any one of the first aspect to the fifth aspect, wherein the second member is adjacent to the outer edge of the second member, and the first member including a flat surface extending substantially parallel to the

According to this aspect, when the bathtub lid is placed on the bathtub, the flat surface formed on the second member comes into surface contact with the upper surface of the bathtub, so that the bathtub lid can be placed on the bathtub in a stable state. can be placed.

A bathtub cover according to a seventh aspect is the bathtub lid according to any one of the first aspect to the sixth aspect, wherein the at least one curved portion extends in a dome shape.

According to this aspect, when the at least one dome-shaped curved portion is thermally expanded, it can easily and effectively move in a direction that intersects the reference direction and separates from the first member (a direction that eliminates the curve). You can evacuate. Furthermore, since it is easy to form the dome-shaped curved portion in the mold for forming the second member, at least one dome-shaped curved portion can be easily formed in the second member. can.

A bathtub lid according to an eighth aspect is a bathtub lid according to any one of the first aspect to the seventh aspect, wherein the at least one curved portion is located between a first corner included in an end face of the bathtub lid and the first corner included in the end surface of the bathtub lid. a first curved portion provided along a first region between a second corner adjacent to the corner of the second corner included in the end face and a second corner adjacent to the second corner and a second curve provided along a second region between the three corners.

According to this aspect, the plurality of curved portions can be effectively and easily formed in the second member.

A bathtub lid according to a ninth aspect is a bathtub lid according to any one of the first aspect to the eighth aspect, wherein the first member and the second member are made of polypropylene, and the core material is made of foamed polypropylene. It is formed.

According to this aspect, the first member, the second member, and the core are made of appropriate materials, so that the bathtub lid can be easily and effectively manufactured to suppress warping caused by thermal expansion. can.

A bathtub lid according to a tenth aspect is a bathtub lid according to any one of the first aspect to the ninth aspect, wherein the core material is attached to each of the at least one curved portions on the surface facing the second member. having a curved region along the

According to this aspect, the core material has a shape that conforms to the shape of the second member, so that it can reliably come into contact with the second member to support and protect the second member.

According to the various aspects described above, it is possible to provide a bathtub lid that can at least partially suppress warping due to thermal expansion by means of a novel configuration.

D reference direction C central part 1 bathtub system 10 bathtub 12 opening 14 container 16 upper surface 20, 22 bathtub lid 100 first member 110 outer edge 200 second member 210 base 220 outer edge 230, 520, 522, 524, 526, 528 curved portion 240, 530 flat portion 300 core 310 curved region 320 flat extending region 500A first corner 500B second corner 500C third corner 500D fourth corner 500E fifth corner 500F sixth corner 510A first region 510B second region 510C third region 510D fourth region 510E fifth region

Claims (9)

a first member formed in a substantially plate shape;
At least one curved portion is formed extending from the outer edge of the first member along a reference direction toward the center thereof to reduce the distance between the first member and the first member. a second member extending opposite to the first member with a core material interposed therebetween;
and
The bathtub lid, wherein the curved portion extends in a dome shape, the boundary between the curved portion and the flat portion surrounding the curved portion is substantially circular, and the curved portion is provided in a region including the central portion of the second member. . 2. The bathtub lid according to claim 1, wherein said core material is welded to said first member and said second member. The bathtub lid according to claim 1 or 2, wherein the outer edge of the first member and the outer edge of the second member are joined. At least one of the outer edge portion of the first member and the outer edge portion of the second member forms an end face of the bathtub lid extending in a direction intersecting the extending direction of the first member. The bathtub lid according to claim 3, wherein 5. The bathtub lid of claim 4, wherein said end surface includes at least one of a flat surface and a curved surface. 6. Any of claims 1-5, wherein the second member includes a planar surface adjacent an outer edge of the second member and extending generally parallel to the first member. bathtub lid. The at least one curved portion is
a first curved portion provided along a first region between a first corner included in an end face of the bathtub lid and a second corner adjacent to the first corner;
a second curved portion provided along a second region between the second corner included in the end face and a third corner adjacent to the second corner;
7. A bathtub lid according to any one of claims 1 to 6 , comprising a. The bathtub lid according to any one of claims 1 to 7 , wherein said first member and said second member are made of polypropylene, and said core material is made of foamed polypropylene. 9. The bathtub lid according to any one of claims 1 to 8 , wherein the core material has curved regions along each of the at least one curved portion on the surface facing the second member.

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