Bathtub

Abstract

We provide a bathtub that makes it easy for multiple people to relax, even when bathing at the same time. [Solution] The bathtub 1 in this embodiment comprises a bathtub body 10 having a first bathtub section 2 and a second bathtub section 3 connected to the first bathtub section 2 and narrower than the first bathtub section 2. The upper inner surface 24 of the first bathtub section 2 has a curved surface formed in an arc shape in plan view. The first bathtub section 2 has a first stepped section 4 whose upper surface protrudes inward from the curved surface of the upper inner surface 24 and is positioned above the bottom surface 11 of the bathtub body 10. The upper surface of the first stepped section 4 is formed on both sides of the center of the width direction Y of the first bathtub section 2 and on both sides of the center of the depth direction X of the first bathtub section 2.

Description

Technical Field

[0001] The present invention relates to a bathtub.

Background Art

[0002] The bathtub unit disclosed in Patent Document 1 is a bathtub unit in which the short sides and the long sides of the apron at the upper edge of the bathtub are formed to have the same length respectively, so that the bathtub can be installed with its installation direction freely reversed left and right. A washing area is adjacent to one long side of the apron, and a bay window is adjacent to the other long side of the apron. A step portion on which a person can sit when taking a bath in the bathtub is provided on the wall surface of the bathtub located on one or the other long side of the apron, bulging inward.

[0003] In the bathtub unit of Patent Document 1, the bathtub is installed such that a bather sitting on the step portion faces a person entering the room who is seated on a bench in the washing area. Accordingly, it is described that the bather sitting on the step portion during bathing and the room entrant seated on the bench in the washing area can face each other, make eye contact with each other, and communicate with each other. Further, in the bathtub unit of Patent Document 1, it is preferable that the step portion is provided close to one of the two short sides of the apron. In this case, since the step portion is close to one short side of the apron, a bather who has taken a bath on the other short side and a bather seated on the step portion can take a bath side by side facing the same direction. Accordingly, when two bathers take a bath facing the washing area, they can enjoy communication with a room entrant seated on the bench in the washing area; when two bathers take a bath facing the window, they can obtain a sense of openness through the window, which can be achieved according to respective needs. Moreover, it is described that an adult bather on the other short side and a child bather seated on the step portion can take a bath side by side facing the same direction, enabling communication between the adult and the child.

[0004] By the way, in the technology disclosed in Patent Document 1, the inwardly bulging step is located on one or the other long side of the frame. As a result, when multiple people bathe at the same time, some will sit on the step and others will sit at the bottom. Since their eye levels will be different, it will be difficult for them to bathe at the same eye level. When multiple people sit at the bottom of the bathtub, it is assumed that they will sit facing each other at opposite ends of the bathtub. However, considering the psychological effect (Stinzer effect) in which seating positions affect relationships with others in a place where multiple people gather, it is said that conflict is likely to arise with the person sitting directly opposite. As a result, sitting facing each other at opposite ends of the bathtub may make it difficult to relax while bathing. Furthermore, although the technology disclosed in Patent Document 1 states that bathers sitting on the step and occupants sitting on the bench in the washing area can face each other, make eye contact, and communicate with each other, even in this case, since they are facing each other, considering the psychological effect, it may be difficult for the bather and occupant to relax. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2012-239533 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the present invention was devised in view of the above-mentioned problems, and its purpose is to provide a bathtub that makes it easy for multiple people to relax even when bathing at the same time. [Means for solving the problem]

[0007] The bathtub according to the present invention comprises a bathtub body having a first bathtub section and a second bathtub section connected to the first bathtub section, wherein the internal width of the second bathtub section is narrower than the internal width of the first bathtub section, the first inner surface of the first bathtub section has a curved surface formed in an arc shape in plan view, the first bathtub section has a first stepped section whose upper surface protrudes inward from the curved surface of the first inner surface and is positioned above the bottom surface of the bathtub body, and the first stepped section is formed on both sides of the center in the width direction of the first bathtub section, and is formed on both sides of the center in the depth direction of the first bathtub section, satisfying at least one of these conditions. [Effects of the Invention]

[0008] According to the present invention, the first bathtub section has a first stepped section whose upper surface protrudes inward from the curved surface of the upper inner surface and is positioned above the bottom surface of the bathtub body, and the upper surface of the first stepped section is formed on both sides of the center in the width direction of the first bathtub section, and on both sides of the center in the depth direction of the first bathtub section, at least one of these conditions is met. As a result, when multiple people, such as a parent and child, sit on the upper surface of the first stepped section, for example, on both sides of the center in the width direction or the center in the depth direction, each person's body can be directed toward the center of the arc shape in plan view of the upper inner surface, making it easier to sit so that their relative positions are at an angle. Therefore, it is easier for multiple people to relax even when bathing at the same time. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a perspective view showing the bathtub in the first embodiment in an exploded view. [Figure 2] Figure 2 is a plan view showing the bathtub in the first embodiment. [Figure 3] Figure 3 is a cross-sectional view showing a bathtub in the first embodiment. [Figure 4] Figure 4 is a perspective view showing the state in which the first detachable member is attached to the first bathtub portion of the bathtub in the first embodiment. [Figure 5]Figure 5 is a cross-sectional view showing the state in which the first detachable member is attached to the first bathtub portion of the bathtub in the first embodiment. [Figure 6] Figure 6 is a perspective view showing the state in which the second detachable member is attached to the second bathtub portion of the bathtub in the first embodiment. [Figure 7] Figure 7 is a cross-sectional view showing the state in which the second detachable member is attached to the second bathtub portion of the bathtub in the first embodiment. [Figure 8] Figure 8 is a perspective view showing the state in which the first detachable member and the second detachable member are attached to the first bathtub portion of the bathtub in the first embodiment. [Figure 9] Figure 9 is a cross-sectional view showing the state in which the first detachable member and the second detachable member are attached to the first bathtub portion of the bathtub in the first embodiment. [Figure 10] Figure 10 is a plan view showing the bathtub in the second embodiment. [Figure 11] Figure 11 is a cross-sectional view showing a bathtub in the second embodiment. [Figure 12] Figure 12(a) is a plan view showing the bathtub in the third embodiment, and Figure 12(b) is a plan view showing the bathtub in the fourth embodiment. [Figure 13] Figure 13 is a cross-sectional view showing a bathtub in the fifth embodiment. [Figure 14] Figure 14(a) is a cross-sectional view showing the bathtub in the sixth embodiment, and Figure 14(b) is a cross-sectional view showing the bathtub in the seventh embodiment. [Figure 15] Figure 15 is a perspective view showing the bathtub in the eighth embodiment. [Figure 16] Figure 16 is a perspective view showing the bathtub in the ninth embodiment. [Figure 17] Figure 17 is a cross-sectional view showing a bathtub in the tenth embodiment. [Figure 18] Figure 18 is a perspective view showing the bathtub in the 11th embodiment. [Figure 19] Figure 19 is a perspective view showing a bathtub in the twelfth embodiment.

[0010] Hereinafter, modes for carrying out a bathtub to which the present invention is applied will be described in detail with reference to the drawings.

[0011] <First Embodiment> As shown in FIG. 1, a bathtub 1 includes a bathtub main body portion 10, a first detachable member 8, and a second detachable member 9. A bottom surface 11 of the bathtub main body portion 10 is arranged at a position higher than a floor F of a bathroom, for example. The bottom surface 11 may be arranged at the same height as the floor F, or may be arranged at a height lower than the floor F. In the present embodiment, an example in which the bathtub 1 is fixed to the floor F is illustrated, but it may be a stationary bathtub that is movable from the floor F. Further, the bottom surface 11 is provided with a drain outlet (not shown). The bottom surface 11 and the upper surfaces of the respective step portions described later may be provided with flow paths or slopes for draining water during drainage or the like.

[0012] (Bathtub main body portion 10) The bathtub main body portion 10 is made of, for example, resin. The bathtub main body portion 10 includes a first bathtub portion 2 and a second bathtub portion 3 connected to the first bathtub portion 2. A direction in which the first bathtub portion 2 and the second bathtub portion 3 are connected is defined as a depth direction X, and a direction intersecting the depth direction X is defined as a width direction Y. A center C1 of the first bathtub portion 2 in the width direction Y coincides with a center C2 of the second bathtub portion 3 in the width direction Y. In the width direction Y, the inner width of the second bathtub portion 3 is narrower than the inner width of the first bathtub portion 2.

[0013] As shown in FIGS. 2 and 3, the first bathtub portion 2 includes a first inner side surface 21 which is an inner side surface of the first bathtub portion 2, a first outer side surface 22 which is an outer side surface of the first bathtub portion 2, and a first flange 23 extending in a horizontal direction. Inside the first bathtub portion 2, there are a first step portion 4, a second step portion 5, and a fourth step portion 7. An upper surface of the first step portion 4 is arranged below the first flange 23. An upper surface of the second step portion 5 is lower in height than the upper surface of the first step portion 4. An upper surface of the fourth step portion 7 is lower in height than the upper surface of the second step portion 5. The first inner side surface 21 includes an upper inner side surface 24 connected to the first flange 23, an inner side surface 41 of the first step portion 4, an inner side surface 51 of the second step portion 5, and an inner side surface 71 of the fourth step portion 7.

[0014] The upper inner surface 24 has a curved surface that is formed in an arc shape when viewed from above. The upper inner surface 24 is composed entirely of concave curved surfaces. The first outer surface 22 has a curved surface that is formed in an arc shape when viewed from above. The first outer surface 22 is composed entirely of convex curved surfaces. The first flange 23 is formed at the upper end of the first bathtub section 2. The first flange 23 is connected to the upper inner surface 24 and the first outer surface 22.

[0015] The upper surface of the first stepped section 4 protrudes inward from the curved surface of the upper inner surface 24. The upper surface of the first stepped section 4 is positioned above the bottom surface 11 of the bathtub body 10. The upper surface of the first stepped section 4 is formed in a crescent shape in plan view. The inner surface 41 of the first stepped section 4 has a curved surface that is formed in an arc shape in plan view. The inner surface 41 of the first stepped section 4 is composed entirely of concave curved surfaces.

[0016] The upper surface of the first stepped portion 4 is formed on both sides of the center C1 of the first bathtub portion 2 in the width direction Y. In this embodiment, the upper surface of the first stepped portion 4 extends on both sides, straddling the center C1 of the first bathtub portion 2 in the width direction Y. In this invention, multiple upper surfaces of the first stepped portion 4 may be arranged spaced apart on both sides of the center C1 of the first bathtub portion 2 in the width direction Y.

[0017] The upper surfaces of the first stepped portion 4 are formed on both sides of the central C3 of the first bathtub portion 2 in the depth direction X. In this embodiment, the upper surfaces of the first stepped portion 4 extend to both sides, straddling the central C3 of the first bathtub portion 2 in the depth direction X. In this invention, multiple upper surfaces of the first stepped portion 4 may be arranged spaced apart on both sides of the central C3 of the first bathtub portion 2 in the depth direction X.

[0018] In this embodiment, the first stepped portion 4 is formed integrally with the first bathtub portion 2. However, in this invention, the first stepped portion 4 may be detachably attached to the first bathtub portion 2.

[0019] The upper surface of the second stepped section 5 protrudes inward from the inner surface 41 of the first stepped section 4. The upper surface of the second stepped section 5 is positioned above the bottom surface 11 of the bathtub body 10. The upper surface of the second stepped section 5 is formed in a crescent shape in plan view. The inner surface 51 of the second stepped section 5 has a curved surface that is formed in an arc shape in plan view. The inner surface 51 of the second stepped section 5 is composed entirely of concave curved surfaces.

[0020] The upper surface of the second stepped portion 5 is formed on both sides of the center C1 in the width direction Y of the first bathtub portion 2. In this embodiment, the upper surface of the second stepped portion 5 extends on both sides, straddling the center C1 in the width direction Y of the first bathtub portion 2. In this invention, multiple upper surfaces of the second stepped portion 5 may be arranged spaced apart on both sides of the center C1 in the width direction Y of the first bathtub portion 2.

[0021] The upper surface of the second stepped portion 5 is formed on both sides of the central C3 of the first bathtub portion 2 in the depth direction X. In this embodiment, the upper surface of the second stepped portion 5 extends on both sides, straddling the central C3 of the first bathtub portion 2 in the depth direction X. In this invention, multiple upper surfaces of the second stepped portion 5 may be arranged spaced apart on both sides of the central C3 of the first bathtub portion 2 in the depth direction X.

[0022] In this embodiment, the second stepped portion 5 is formed integrally with the first bathtub portion 2. However, in this invention, the second stepped portion 5 may be detachably attached to the first bathtub portion 2.

[0023] As shown in Figure 3, the second bathtub section 3 has a second inner surface 31 which is the inner side surface of the second bathtub section 3, a second outer surface 32 which is the outer side surface of the second bathtub section 3, and a second flange 33 that extends horizontally. Inside the second bathtub section 3 are a third stepped section 6 and a fourth stepped section 7. The upper surface of the third stepped section 6 is positioned below the second flange 33. The upper surface of the fourth stepped section 7 is lower in height than the upper surface of the third stepped section 6. The second inner surface 31 includes an upper inner surface 34 connected to the second flange 33, the inner surface 61 of the third stepped section 6, and the inner surface 71 of the fourth stepped section 7.

[0024] As shown in Figure 2, the upper inner surface 34 has a curved surface that is formed in an arc shape when viewed from above. The upper inner surface 34 is composed entirely of a concave curved surface. The second outer surface 32 has a curved surface that is formed in an arc shape when viewed from above. The second outer surface 32 is composed entirely of a convex curved surface. The second flange 33 is formed at the upper end of the second bathtub section 3. The second flange 33 is connected to the upper inner surface 34 and the second outer surface 32.

[0025] The upper inner surface 34 is connected to the upper inner surface 24. The second outer surface 32 is connected to the first outer surface 22. The second flange 33 is connected to the first flange 23 and is at the same height as the first flange 23.

[0026] The second bathtub section 3 has a third stepped section 6 whose upper surface is positioned below the second flange 33. The upper surface of the third stepped section 6 is at the same height as the upper surface of the second stepped section 5. The upper surfaces of the second stepped section 5 and the third stepped section 6 are formed symmetrically in a plane that intersects at the center C1 in the width direction Y of the first bathtub section 2.

[0027] The upper surface of the third stepped section 6 protrudes inward from the curved surface of the upper inner surface 34. The upper surface of the third stepped section 6 is positioned above the bottom surface 11 of the bathtub body 10. The upper surface of the third stepped section 6 is formed in a crescent shape in plan view. The inner surface 61 of the third stepped section 6 has a curved surface that is formed in an arc shape in plan view. The inner surface 61 of the third stepped section 6 is composed entirely of concave curved surfaces.

[0028] The upper surface of the third stepped section 6 is formed on both sides of the center C2 in the width direction Y of the second bathtub section 3. In this embodiment, the upper surface of the third stepped section 6 extends on both sides, straddling the center C2 in the width direction Y of the second bathtub section 3. In this invention, multiple upper surfaces of the third stepped section 6 may be arranged spaced apart on both sides of the center C2 in the width direction Y of the second bathtub section 3.

[0029] The upper surface of the third stepped section 6 is formed on both sides of the central C4 of the second bathtub section 3 in the depth direction X. In this embodiment, the upper surface of the third stepped section 6 extends on both sides, straddling the central C4 of the second bathtub section 3 in the depth direction X. In this invention, multiple upper surfaces of the third stepped section 6 may be arranged spaced apart on both sides of the central C4 of the second bathtub section 3 in the depth direction X.

[0030] In this embodiment, the third stepped portion 6 is formed integrally with the second bathtub portion 3. However, in this invention, the third stepped portion 6 may be detachably attached to the second bathtub portion 3.

[0031] The bathtub body 10 has a fourth stepped section 7 between the inner surface 51 of the second stepped section 5 and the inner surface 61 of the third stepped section 6, the fourth stepped section 7 having an upper surface positioned lower than the upper surfaces of the second stepped section 5 and the third stepped section 6.

[0032] The upper surface of the fourth stepped section 7 spans the first bathtub section 2 and the second bathtub section 3. The upper surface of the fourth stepped section 7 is positioned above the bottom surface 11 of the bathtub body section 10. The upper surface of the fourth stepped section 7 is formed in an arc-triangular shape in plan view. The inner surface 71 of the fourth stepped section 7 has a curved surface that is formed in an arc shape in plan view. The inner surface 71 of the fourth stepped section 7 is composed entirely of convex curved surfaces.

[0033] In this embodiment, the fourth stepped portion 7 is integrally formed with the first bathtub portion 2 and the second bathtub portion 3. In addition, in the present invention, the fourth stepped portion 7 may be detachably attached to the first bathtub portion 2 and the second bathtub portion 3.

[0034] (First detachable member 8) As shown in Figures 4 and 5, the first detachable member 8 is detachably attached to the upper surface of the first stepped portion 4 of the first bathtub section 2. The shape of the first detachable member 8 in plan view is substantially the same as the shape of the upper surface of the first stepped portion 4 in plan view, and is formed in a crescent shape.

[0035] The first detachable member 8 has an inner surface 81, an outer surface 82, and a top surface 83.

[0036] The inner surface 81 has a curved surface that is formed in the shape of a circular arc when viewed from above. The inner surface 81 is composed entirely of concave curved surfaces. The outer surface 82 has a curved surface that is formed in the shape of a circular arc when viewed from above. The outer surface 82 is composed entirely of convex curved surfaces. The upper surface 83 is connected to the inner surface 81 and the outer surface 82.

[0037] The inner surface 81 of the first detachable member 8 is formed to conform to the inner surface 41 of the first stepped portion 4. The outer surface 82 of the first detachable member 8 is formed to conform to the upper inner surface 24 of the first bathtub portion 2. The first detachable member 8 can be attached to and detached from the second stepped portion 5 of the first bathtub portion 2 by guiding its outer surface 82 to the upper inner surface 24.

[0038] When the first detachable member 8 is placed on the upper surface of the first stepped portion 4, the upper surface 83 and the first flange 23 are at the same height. At this time, the outer surface 82 of the first detachable member 8 can make surface contact with the upper inner surface 24 of the first bathtub portion 2.

[0039] The first detachable member 8 is made of, for example, resin, and is formed into a block shape with air sealed inside. The predetermined anti-slip mechanism of the first detachable member 8 prevents it from floating or shifting when hot water is placed in the bathtub body 10. For example, the first detachable member 8 may be prevented from shifting by friction against the upper inner surface 24. Alternatively, the first detachable member 8 may be prevented from shifting by an anti-slip mechanism located on at least one of the upper inner surface 24 and the upper surface of the first stepped portion 4. The first detachable member 8 may also be prevented from shifting by having a predetermined weight in the first bathtub portion 2.

[0040] (Second detachable member 9) As shown in Figures 6 and 7, the second detachable member 9 is detachably attached to the upper surface of the third stepped portion 6 of the second bathtub section 3. The shape of the second detachable member 9 in plan view is substantially the same as the shape of the upper surface of the third stepped portion 6 in plan view, and is formed in a crescent shape.

[0041] The second detachable member 9 has an inner surface 91, an outer surface 92, and a top surface 93.

[0042] The inner surface 91 has a curved surface that is formed in the shape of an arc when viewed from above. The inner surface 91 is composed entirely of concave curved surfaces. The outer surface 92 has a curved surface that is formed in the shape of an arc when viewed from above. The outer surface 92 is composed entirely of convex curved surfaces. The upper surface 93 is connected to the inner surface 91 and the outer surface 92.

[0043] The inner surface 91 of the second detachable member 9 is formed to conform to the inner surface 61 of the third stepped portion 6. The outer surface 92 of the second detachable member 9 is formed to conform to the upper inner surface 34 of the second bathtub portion 3. The second detachable member 9 can be attached to and detached from the third stepped portion 6 of the second bathtub portion 3 by guiding its outer surface 92 to the upper inner surface 34.

[0044] When the second detachable member 9 is placed on the upper surface of the third stepped portion 6, the upper surface 93 and the second flange 33 are positioned at the same height. At this time, the outer surface 92 of the second detachable member 9 can make surface contact with the upper inner surface 34 of the second bathtub portion 3.

[0045] As shown in Figures 8 and 9, the second detachable member 9 is also detachably attached to the upper surface of the second stepped portion 5 of the first bathtub section 2. The second detachable member 9 is detachably attached to the inner surface 41 of the first stepped portion 4 and the inner surface 81 of the first detachable member 8. In this invention, it may also be detachably attached to at least one of the inner surface 41 of the first stepped portion 4 and the inner surface 81 of the first detachable member 8. The second detachable member 9 is detachably attached to the upper surface of the second stepped portion 5 of the first bathtub section 2 by guiding its outer surface 92 to the inner surface 41 of the first stepped portion 4 and the inner surface 81 of the first detachable member 8.

[0046] When the first detachable member 8 is placed on the upper surface of the first stepped portion 4 and the second detachable member 9 is placed on the upper surface of the second stepped portion 5, the upper surface 93, the upper surface 83, and the first flange 23 are at the same height. At this time, the outer surface 92 of the second detachable member 9 can make surface contact with the inner surface 41 of the first stepped portion 4 and the inner surface 81 of the first detachable member 8. In this invention, the outer surface 92 of the second detachable member 9 may also make surface contact with at least one of the inner surface 41 of the first stepped portion 4 and the inner surface 81 of the first detachable member 8.

[0047] The second detachable member 9 is made of, for example, resin, and is formed into a block shape with air sealed inside. The second detachable member 9 can be prevented from shifting, such as floating up when hot water is placed in the bathtub body 10, by a predetermined anti-slip mechanism. For example, the second detachable member 9 may be prevented from shifting by friction on the inner surface 81 or the upper inner surface 34. This suppresses the shifting of the second detachable member 9. In order to suppress the shifting of the second detachable member 9, the second detachable member 9 may be prevented from shifting via an anti-slip mechanism on at least one of the upper inner surface 34, the inner surface 81, the upper surface of the second stepped portion 5, and the upper surface of the third stepped portion 6. The second detachable member 9 may also be prevented from shifting by having a predetermined weight, which is required to restrain it from shifting in the first bathtub portion 2 or the second bathtub portion 3.

[0048] In addition, in the present invention, a detachable member may be provided on at least one of the first bathtub section 2 and the second bathtub section 3. This detachable member has an outer surface that is aligned with at least one of the first inner surface 21 of the first bathtub section 2 and the second inner surface 31 of the second bathtub section 3.

[0049] According to this embodiment, the bathtub body 10 comprises a first bathtub section 2 and a second bathtub section 3 connected to the first bathtub section 2 and narrower than the first bathtub section 2. This makes it easier for multiple people to bathe in the wide first bathtub section 2. Furthermore, by making the second bathtub section 3 narrower than the first bathtub section 2, the second bathtub section 3 can be made more compact. This reduces the feeling of being cramped in the bathroom space.

[0050] According to this embodiment, the upper inner surface 24 of the first bathtub section 2 has a curved surface formed in an arc shape when viewed from above, and the first outer surface 22 of the first bathtub section 2 has a curved surface formed in an arc shape when viewed from above. As a result, the area of ​​the first bathtub section 2 when viewed from above can be kept small relative to the volume of the first bathtub section 2, making the first bathtub section 2 more compact. Therefore, the feeling of being cramped in the bathroom space can be suppressed.

[0051] According to this embodiment, the upper inner surface 34 of the second bathtub section 3 has a curved surface formed in an arc shape when viewed from above, and the second outer surface 32 of the second bathtub section 3 also has a curved surface formed in an arc shape when viewed from above. This makes the area of ​​the second bathtub section 3 in a plan view smaller relative to its volume, allowing the second bathtub section 3 to be made even more compact. As a result, the feeling of being cramped in the bathroom space can be reduced.

[0052] According to this embodiment, the first bathtub section 2 has a first stepped section 4 whose upper surface protrudes inward from the curved surface of the upper inner surface 24 and is positioned above the bottom surface 11 of the bathtub body section 10. The upper surface of the first stepped section 4 is formed on both sides of the center C1 in the width direction Y of the first bathtub section 2, and on both sides of the center C3 in the depth direction X of the first bathtub section 2. As a result, when multiple people, such as a parent and child, sit on the upper surface of the first stepped section 4, for example, on both sides of the center C1 or center C3, each person's body can be directed toward the center of the arc shape of the upper inner surface 24 in plan view, making it easier to sit so that their relative positions are at an angle. Therefore, it is easier for multiple people to relax even when bathing at the same time.

[0053] According to this embodiment, the upper surface of the first stepped section 4 extends to both sides, straddling the central point C1 of the first bathtub section 2 in the width direction Y. This makes it easier for multiple people to sit on the upper surface of the first stepped section 4. Furthermore, because it extends to both sides, straddling the central point C1 of the first bathtub section 2 in the width direction Y, it becomes easier to adjust the seating positions of multiple people in the width direction Y. Therefore, it is possible to increase the number of patterns of relative positional relationships for people sitting on the upper surface of the first stepped section 4.

[0054] According to this embodiment, a detachable member is provided on at least one of the first bathtub section 2 and the second bathtub section 3, and the detachable member has an outer surface that is aligned with at least one of the first inner surface 21 of the first bathtub section 2 and the second inner surface 31 of the second bathtub section 3. This allows for the extension of the seat and adjustment of the seat height, enabling the user to appropriately select a more relaxing bathing posture and bathing positions for multiple people. It can also be used as an armrest or backrest, allowing for the selection of an even more relaxing bathing posture.

[0055] In conventional bathtubs, adjusting the volume was difficult. In this embodiment, however, the first bathtub section 2 is equipped with a first detachable member 8, which has an outer surface 82 that runs along the upper inner surface 24. As a result, the volume of the first bathtub section 2 can be adjusted by attaching or detaching the first detachable member 8. This allows for water conservation.

[0056] According to this embodiment, the first detachable member 8 is detachably attached to the upper surface of the first stepped portion 4, and the inner surface 81 of the first detachable member 8 is shaped to conform to the inner surface 41 of the first stepped portion 4. This allows the height of the upper surface of the first stepped portion 4 to be adjusted. Furthermore, when a user sits in the first bathtub portion 2, it becomes easier for the user to lean their back against the inner surfaces 41 and 81, which are aligned with each other.

[0057] According to this embodiment, the second bathtub section 3 is equipped with a detachable second detachable member 9, the second detachable member 9 having an outer surface 92 along the upper inner surface 34 of the second bathtub section 3, the first stepped section 4 having an inner surface 41 along the outer surface 92 of the second detachable member 9, and the second detachable member 9 is detachably attached to the inner surface 41 of the first stepped section 4. Since the second detachable member 9 is detachably attached to both the first bathtub section 2 and the second bathtub section 3, the volume of the first bathtub section 2 and the second bathtub section 3 can be adjusted according to the attachment and detachment of the second detachable member 9. This allows for water conservation. Furthermore, one second detachable member 9 can be used in common with both the first bathtub section 2 and the second bathtub section 3. Therefore, the variations of the bathtub body section 10 can be increased by the user appropriately selecting how to place the second detachable member 9.

[0058] According to this embodiment, the second bathtub section 3 is equipped with a second detachable member 9 that can be attached to or detached from the first bathtub section 2. The second detachable member 9 has an outer surface 92 that is aligned with the upper inner surface 34 of the second bathtub section 3, and the first stepped section 4 has an inner surface 41 that is aligned with the outer surface 92 of the second detachable member 9. The second detachable member 9 can be attached to or detached from the first bathtub section 2 by guiding the outer surface 92 of the second detachable member 9 to the inner surface 41 of the first stepped section 4. This makes it easy to attach and detach the second detachable member 9.

[0059] According to this embodiment, the second detachable member 9 is provided to the second bathtub section 3, the second detachable member 9 has an outer surface 92 that is aligned with the upper inner surface 34 of the second bathtub section 3, the first stepped section 4 has an inner surface 41 that is aligned with the outer surface 92 of the second detachable member 9, the second detachable member 9 is detachably attached to the first bathtub section 2, the outer surface 92 of the second detachable member 9 can make surface contact with the inner surface 41 of the first stepped section 4 and the inner surface 81 of the first detachable member 8, and the outer surface 92 of the second detachable member 9 has a shape that is aligned with the inner surface 81 of the first detachable member 8. This allows the first detachable member 8 and the second detachable member 9 to be neatly installed in the first bathtub section 2.

[0060] According to this embodiment, the first bathtub section 2 has the upper surface of the second step section 5, which is positioned below the upper surface of the first step section 4, and the second bathtub section 3 has the upper surface of the third step section 6, which is at the same height as the upper surface of the second step section 5. As a result, for example, if the user sits on the upper surface of the first step section 4, they can take a half-body bath. If the user sits on the upper surface of the second step section 5, they can bathe with their feet on the bottom surface 11 and with their feet extended over the upper surface of the third step section 6. Therefore, the number of postures the user can take while bathing can be increased, allowing the user to appropriately select a posture that makes it easy for them to relax while bathing.

[0061] When taking a half-body bath using the upper surface of the first step 4 of the bathtub body 10 as a seat, it is preferable to set the height from the upper surface of the first step 4, which serves as the seat, to the upper end (first flange 23) of the bathtub body 10 to approximately 250 mm to 300 mm. When taking a full-body bath using the upper surface of the second step 5 as a seat, it is preferable to set the height from the upper surface of the second step 5, which serves as the seat, to the upper end (first flange 23) of the bathtub body 10 to approximately 450 mm to 550 mm. When taking a full-body bath using the upper surface of the third step 6 as a seat, it is preferable to set the height from the upper surface of the third step 6 to the upper end (second flange 33) of the bathtub body 10 to approximately 450 mm to 550 mm.

[0062] In addition, the upper surfaces of the first step 4, the second step 5, and the third step 6 can be used as steps when entering the bathtub body 10. This makes it easier for elderly people to enter the bathtub body 10.

[0063] According to this embodiment, the bathtub body 10 has an upper surface of a fourth step 7 positioned below the upper surface of the second step 5, between the inner surface 51 of the second step 5 and the inner surface 61 of the third step 6. For example, when a user sits on the upper surface of the second step 5, they can bathe with their feet on the bottom surface 11 and with their feet on the upper surface of the fourth step 7. This increases the number of postures a user can take while bathing.

[0064] In addition, the upper surface of the fourth step section 7 can be used as a step when entering the bathtub body section 10. This makes it easier for elderly people to enter the bathtub body section 10.

[0065] According to this embodiment, the first bathtub section 2 has the upper surface of the second stepped section 5 which is positioned below the upper surface of the first stepped section 4, the second bathtub section 3 has the upper surface of the third stepped section 6 which is at the same height as the upper surface of the second stepped section 5, and the second detachable member 9 is detachably attached to the upper surface of the second stepped section 5 and the upper surface of the third stepped section 6. This allows the heights of the upper surfaces of the second stepped section 5 and the third stepped section 6 to be adjusted.

[0066] Although not shown in the diagram, in this invention, the first bathtub section 2 and the second bathtub section 3 may be formed symmetrically in a plane along the center C1 in the width direction Y of the first bathtub section 2. In this case, when installing the bathtub body section 10 in the bathroom, the degree of freedom in the direction in which the bathtub body section 10 is positioned can be increased. For this reason, even in layouts where the installation position of the bathtub body section 10 is reversed, such as when the bathroom is oriented left or right, it becomes easier to position it in the bathtub.

[0067] <Second Embodiment> Next, the bathtub 1 in the second embodiment will be described. Detailed explanations of the configuration, which is the same as in the embodiment described above, will be omitted below.

[0068] As shown in Figures 10 and 11, in the bathtub 1 of the second embodiment, the second bathtub section 3 is formed in a U-shape when viewed from above.

[0069] The upper surface of the first step section 4 is at the same height as the bathroom floor F. In this case, the distance from the first flange 23 and the second flange 33 to the floor F is smaller compared to the case where the floor F and the bottom surface 11 are at the same height. This makes it easier for the user to enter the bathtub body 10. The floor F may also be at the same height as the upper surface of the first step section 4, the upper surface of the second step section 5, the upper surface of the third step section 6, or the upper surface of the fourth step section 7. Even in this case, it is still easier for the user to enter the bathtub body 10.

[0070] <Third Embodiment> Next, the bathtub 1 in the third embodiment will be described.

[0071] As shown in Figure 12(a), in the bathtub 1 of this embodiment, the upper surface of the first stepped portion 4 is formed on both sides of the center C1 of the first bathtub portion 2 in the width direction Y. In this embodiment, the upper surface of the first stepped portion 4 extends on both sides, straddling the center C1 of the first bathtub portion 2 in the width direction Y. In this invention, multiple upper surfaces of the first stepped portion 4 may be arranged spaced apart on both sides of the center C1 of the first bathtub portion 2 in the width direction Y.

[0072] According to this embodiment, the first bathtub section 2 has an upper surface of a first stepped section 4 that protrudes inward from the curved surface of the upper inner surface 24 and is positioned above the bottom surface 11 of the bathtub body section 10. The upper surface of the first stepped section 4 is formed on both sides of the center C1 of the first bathtub section 2 in the width direction Y. As a result, when multiple people, such as a parent and child, sit on the upper surface of the first stepped section 4 on both sides of the center C1, each person's body can be directed toward the center of the arc shape of the upper inner surface 24 in plan view, making it easier to sit so that their relative positions are at an angle. Therefore, it is easier for multiple people to relax even when bathing at the same time.

[0073] <Fourth Embodiment> Next, the bathtub 1 in the fourth embodiment will be described.

[0074] As shown in Figure 12(b), in the bathtub 1 of this embodiment, the upper surface of the first stepped portion 4 is formed on both sides of the center C3 of the first bathtub portion 2 in the depth direction X. In this embodiment, the upper surface of the first stepped portion 4 extends on both sides, straddling the center C3 of the first bathtub portion 2 in the depth direction X. In this invention, multiple upper surfaces of the first stepped portion 4 may be arranged spaced apart on both sides of the center C3 of the first bathtub portion 2 in the depth direction X.

[0075] According to this embodiment, the first bathtub section 2 has an upper surface of a first stepped section 4 that protrudes inward from the curved surface of the upper inner surface 24 and is positioned above the bottom surface 11 of the bathtub body section 10. The upper surface of the first stepped section 4 is formed on both sides of the center C3 of the first bathtub section 2 in the depth direction X. As a result, when multiple people, such as a parent and child, sit on the upper surface of the first stepped section 4 on both sides of the center C3, each person's body can be directed toward the center of the arc shape of the upper inner surface 24 in plan view, making it easier to sit so that their relative positions are at an angle. Therefore, it is easier for multiple people to relax even when bathing at the same time.

[0076] <Fifth Embodiment> Next, the bathtub 1 in the fifth embodiment will be described.

[0077] As shown in Figure 13, in the bathtub 1 of this embodiment, the first detachable member 8 is prevented from shifting by the anti-slip portion 12 on the upper surface of the first stepped portion 4 of the first bathtub section 2. The anti-slip portion 12 has a magnet 12a attached to the upper surface of the first stepped portion 4 and a magnet 12b attached to the first detachable member 8. The magnet 12b attached to the first detachable member 8 is prevented from shifting by magnetic force from the magnet 12a attached to the upper surface of the first stepped portion 4. Even in this case, the first detachable member 8 is detachably attached to the first bathtub section 2. By guiding the surfaces having the anti-slip portion 12 together, the first detachable member 8 can be easily attached to and detached from the first bathtub section 2.

[0078] According to this embodiment, the first detachable member 8 is prevented from shifting on the upper surface of the first stepped portion 4 via the anti-slip portion 12. This prevents the first detachable member 8, which is placed on the upper surface of the first stepped portion 4, from shifting.

[0079] Although not shown in the diagram, a magnet 12b may be attached to the second detachable member 9, and a magnet 12a may be attached to the first bathtub section 2 and the second bathtub section 3. Even in this case, the second detachable member 9 is detachably attached to the first bathtub section 2 and the second bathtub section 3.

[0080] <Sixth Embodiment> Next, the bathtub 1 in the sixth embodiment will be described.

[0081] As shown in Figure 14(a), in the bathtub 1 of this embodiment, the first detachable member 8 is prevented from shifting by the upper inner surface 24 of the first bathtub section 2 via the anti-slip portion 12. Even in this case, the first detachable member 8 is detachably attached to the first bathtub section 2. The anti-slip portion 12 has a first fitting portion 12c formed on the upper inner surface 24 and a second fitting portion 12d formed on the first detachable member 8. The second fitting portion 12d is prevented from shifting by fitting into the first fitting portion 12c. The first fitting portion 12c is a groove and the second fitting portion 12d is a projection that fits into the first fitting portion 12c, but the first fitting portion 12c may be a projection and the second fitting portion 12d may be a groove.

[0082] According to this embodiment, the first detachable member 8 is prevented from shifting by the anti-slip portion 12 on the upper inner surface 24 of the first bathtub portion 2. This prevents the first detachable member 8, which is placed on the upper surface of the first stepped portion 4, from shifting.

[0083] <Seventh Embodiment> Next, the bathtub 1 in the seventh embodiment will be described.

[0084] As shown in Figure 14(b), in the bathtub 1 of this embodiment, the first detachable member 8 is prevented from shifting by the upper surface of the first stepped portion 4 of the first bathtub portion 2 via the anti-slip portion 12. The anti-slip portion 12 has a first fitting portion 12c formed on the upper surface of the first stepped portion 4 and a second fitting portion 12d formed on the first detachable member 8.

[0085] Although not shown in the illustration, a second fitting portion 12d may be formed on the second detachable member 9, and a first fitting portion 12c may be formed on the first bathtub section 2 and the second bathtub section 3. In this case, the second detachable member 9 can be prevented from shifting away from the first bathtub section 2 and the second bathtub section 3.

[0086] <Eighth Embodiment> Next, the bathtub 1 in the eighth embodiment will be described.

[0087] As shown in Figure 15, in the bathtub 1 of this embodiment, the second detachable member 9 is smaller than the upper surface of the second stepped portion 5. The outer surface 92 of the second detachable member 9 is in contact with a part of the inner surface 41 of the first stepped portion 4. When the second detachable member 9 is placed on the upper surface of the second stepped portion 5, the upper surface 93 of the second detachable member 9 is flush with the upper surface of the first stepped portion 4.

[0088] According to this embodiment, the second detachable member 9 is smaller than the upper surface of the second stepped portion 5. As a result, when the second detachable member 9 is placed on the upper surface of the second stepped portion 5, the upper surface of the second stepped portion 5 is exposed. Therefore, it is possible to sit on the upper surface of the second stepped portion 5 with the second detachable member 9 placed on it. The user can easily use the second detachable member 9 as an armrest.

[0089] According to this embodiment, the upper surface 93 of the second detachable member 9 is flush with the upper surface of the first stepped portion 4. This makes it easier for the user to use the second detachable member 9 as an armrest.

[0090] <Ninth Embodiment> Next, the bathtub 1 in the ninth embodiment will be described.

[0091] As shown in Figure 16, in the bathtub 1 of this embodiment, the first detachable member 8 is smaller than the upper surface of the first stepped portion 4. The outer surface 82 of the first detachable member 8 is in contact with a part of the upper inner surface 24 of the first bathtub portion 2. When the first detachable member 8 is placed on the upper surface of the first stepped portion 4, the upper surface 83 of the first detachable member 8 is flush with the first flange 23.

[0092] According to this embodiment, the first detachable member 8 is smaller than the upper surface of the first stepped portion 4. As a result, when the first detachable member 8 is placed on the upper surface of the first stepped portion 4, the upper surface of the first stepped portion 4 is exposed. Therefore, it is possible to sit on the upper surface of the first stepped portion 4 or the upper surface of the second stepped portion 5 with the first detachable member 8 placed on the upper surface of the first stepped portion 4. The user can easily use the first detachable member 8 as an armrest.

[0093] According to this embodiment, the upper surface 83 of the first detachable member 8 is flush with the first flange 23. This makes it easier for the user to use the first detachable member 8 as an armrest.

[0094] <Tenth Embodiment> Next, the bathtub 1 in the tenth embodiment will be described.

[0095] As shown in Figure 17, in the bathtub 1 of this embodiment, a projection 13 is provided on the inner surface 41 side end of the first step portion 4 that protrudes upward. This makes it difficult for the first attachment / detachment member 8 to fall off the upper surface of the first step portion 4 when it is placed on the upper surface of the first step portion 4. In addition, the projection 13 allows the user to recognize the edge of the upper surface of the first step portion 4 with the sole of their foot, thereby preventing them from stepping off the upper surface of the first step portion 4.

[0096] As shown in Figure 17, in the bathtub 1 of this embodiment, a projection 13 is provided on the inner surface 51 side end of the second step 5. This makes it difficult for the second detachable member 9 to fall off the upper surface of the second step 5 when it is placed on the upper surface of the second step 5. In addition, the projection 13 allows the user to recognize the edge of the upper surface of the second step 5 with the sole of their foot, thereby preventing them from stepping off the upper surface of the second step 5.

[0097] Although not shown in the diagram, a projection 13 that protrudes upward may be provided at the end of the third stepped portion 6 on the inner surface 61 side.

[0098] <Embodiment 11> Next, the bathtub 1 in the 11th embodiment will be described.

[0099] As shown in Figure 18, the bathtub 1 in this embodiment further includes a third detachable member 15 that is detachably attached to the second outer surface 32 of the second bathtub section 3. The inner surface 16 of the third detachable member 15 is formed in a shape that conforms to the second outer surface 32 of the second bathtub section 3. When the inner surface 16 of the third detachable member 15 is attached to the second outer surface 32, the upper surface 17 of the third detachable member 15 is flush with the second flange 33. When the third detachable member 15 is separated from the floor F, the upper surface 17 of the third detachable member 15 is flush with the second flange 33. Note that when the third detachable member 15 is in contact with the floor F, the upper surface of the third detachable member 15 may be flush with the second flange 33.

[0100] According to this embodiment, the second bathtub section 3 is further provided with a detachable third detachable member 15 attached to the second outer surface 32, and the upper surface 17 of the third detachable member 15 is flush with the second flange 33. As a result, when the third detachable member 15 is installed on the second outer surface 32, the user can use the third detachable member 15 as a counter.

[0101] If the third detachable member 15 can be attached to the second outer surface 32 at a position away from the bathroom floor F, the third detachable member 15 can be efficiently drained and dried.

[0102] <Twelfth Embodiment> Next, the bathtub 1 in the twelfth embodiment will be described.

[0103] As shown in Figure 19, the bathtub 1 in this embodiment further includes a third detachable member 15 that is detachably attached to the second outer surface 32 of the second bathtub section 3. The inner surface 16 of the third detachable member 15 is formed in a shape that conforms to the second outer surface 32 of the second bathtub section 3. When the inner surface 16 of the third detachable member 15 is attached to the second outer surface 32, the third detachable member 15 is provided on the floor F. At this time, the upper surface 17 of the third detachable member 15 is positioned below the second flange 33.

[0104] According to this embodiment, the second bathtub section 3 is further provided with a detachable third detachable member 15 attached to the second outer surface 32, and the upper surface 17 of the third detachable member 15 is positioned below the second flange 33. As a result, when the third detachable member 15 is installed on the second outer surface 32, the user can use the third detachable member 15 as a step. This makes it easier for the user to enter the bathtub 1.

[0105] Furthermore, since the detachable members such as the first detachable member 8, the second detachable member 9, and the third detachable member 15 can take on various shapes, the inner surface of the detachable member can also be the outer surface.

[0106] Although several embodiments of this invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. Furthermore, this invention can be implemented in various novel forms in addition to the embodiments described above. Therefore, the above embodiments can be omitted, replaced, or modified in various ways without departing from the spirit of this invention. Such novel forms and modifications are included in the scope and spirit of this invention, as well as in the claims and equivalents of the claims. [Explanation of symbols]

[0107] 1: Bathtub 10: Bathtub body 11: Bottom 2: First bathtub section 21: 1st inner surface 22: 1st outer surface 23: First flange 24: Upper inner side 3: Second Bathtub Section 31:Second inner surface 32: 2nd outer surface 33: Second flange 34: Upper inner side 4: First step section 41: Inner surface 5: Second step section 51: Inner surface 6: Third step section 61: Inner surface 7: Fourth step section 71: Inner surface 8: First detachable member 81: Inner surface 82:Outer surface 83:Top surface 9: Second detachable member 91: Inner surface 92 :Outer surface 93:Top surface C1: Center C2: Center C3: Center C4: Center F:Floor

Claims

1. The bathtub body comprises a first bathtub section and a second bathtub section connected to the first bathtub section. The internal width of the second bathtub section is narrower than the internal width of the first bathtub section. The first inner surface of the first bathtub section has an upper inner surface having a curved surface that is formed in the shape of an arc when viewed from above, The first bathtub section has a first stepped section whose upper surface protrudes inward from the curved surface of the upper inner surface and is positioned above the bottom surface of the bathtub body section. The upper surface of the first stepped portion is The first bathtub section is formed on both sides of the center in the width direction, and It is formed on both sides of the center in the depth direction of the first bathtub section, Satisfying at least one of the following conditions A bathtub characterized by the following.

2. The upper surface of the first stepped portion is The first bathtub section extends to both sides, straddling the center in the width direction, and The first bathtub section extends to both sides, straddling the center in the depth direction. Satisfying at least one of the following conditions A bathtub according to claim 1, characterized by the following:

3. The first bathtub section and the second bathtub section are provided with a detachable member that can be easily attached to them. The detachable member has an outer surface that is aligned with at least one of the first inner surface of the first bathtub portion and the second inner surface of the second bathtub portion. A bathtub according to claim 1, characterized by the following:

4. The first bathtub portion is equipped with a first detachable member, The first detachable member has an outer surface that is aligned with the upper inner surface. A bathtub according to claim 1, characterized by the following:

5. The second bathtub section is equipped with a second detachable member, The second detachable member has an outer surface that is aligned with the second inner surface of the second bathtub portion, The first stepped portion has an inner surface that is aligned with the outer surface of the second detachable member, The second detachable member is detachably attached to the first bathtub by guiding its outer surface to the inner surface of the first stepped portion. A bathtub according to claim 1, characterized by the following:

6. The second bathtub section is equipped with a second detachable member, The second detachable member has an outer surface that is aligned with the second inner surface of the second bathtub portion, The first stepped portion has an inner surface that is aligned with the outer surface of the second detachable member, The second detachable member is detachably attached to the first bathtub portion. The outer surface of the second detachable member is capable of surface contact with at least one of the inner surface of the first stepped portion and the inner surface of the first detachable member. The outer surface of the second detachable member has a shape that conforms to the inner surface of the first detachable member. A bathtub according to claim 4, characterized by the following:

Images