JPH09140612A - Bathtub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the process of changing the back wall inclination and to facilitate the descaling work as well by detachably attaching an L-shaped backrest to span an arrest recess and armrests and the back wall with one part of the backrest roughly horizontal and the other part inclined sharper than the back wall. SOLUTION: For a bather 9 who favors a bathtub 1 with a back wall 23 inclined gentle, a backrest 5 is removed, a pillow mat 59 is placed into and arrest recess 4, the bathtub 1 is filled with water, and the bather 9 is relaxed with the head on the pillow mat 59 and the elbows on armrests 25. The backrest 5 is folded and stowed away. For the bather 9 who favors the bathtub 1 with the back wall 23 inclined sharply, it is so set that te backrest 5 spans the arrest recess 4, the back wall 23, and the armrests 25. The bather 9 enters the bathtub 1, a places the elbows on the armrests 25, and leans against the backrest 5. In this case, a part 52 of the backrest 5 is inclined nearly 90 degrees, and the bather leans against this part 52 of the backrest 5.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a bathtub.

[0002]

2. Description of the Related Art Generally used bathtubs are made of plastic or metal in a bowl shape consisting of both side walls, a front wall, a rear wall and a bottom surface, or a bowl shape made of wood. Many. The back wall of the bathtub facing the bather has a steep slope in a Japanese-style bathtub and a gentle slope in a Western-style bathtub. Also, in the Japanese-Western eclectic bathtub, the slope is in the middle.

This will be described with reference to FIG. 7. A Japanese-style bathtub 100 has a front wall 1 as shown in FIG.
The distance between the upper end of 01 and the upper end of the rear wall 102 is 800 to
It is 1200 mm, and the rear wall 102 has a steep slope close to about 90 °. Therefore, the bather 105 takes a bath with his legs bent. Also, a Western-style bathtub 3
00, the distance between the upper end of the front wall 301 and the upper end of the rear wall 302 is 1200 to 1600 mm, and the rear wall 302 has a gentle slope. Therefore, the bather 305 takes a bath in a relaxed posture close to the figure lying on his back.

In the Japanese-Western eclectic bathtub 200, as shown in (b), the upper end of the front wall 201 and the rear wall 20 are in between.
The distance from the upper end of 2 is 1000 to 1400 mm, and the rear wall 2
02 is an intermediate inclined surface. Therefore, bather 20
5 will take a bath in an intermediate posture. Known bathtubs that can change the inclination of the rear wall into Japanese or Western style are the bathtubs described in Japanese Utility Model Publication No. 5-9387 and Japanese Utility Model Publication No. 6-37747.

In the bathtub disclosed in Japanese Utility Model Laid-Open No. 5-9387, a part of both side walls is formed into a bellows shape that can be expanded and contracted, and the rear wall is formed by changing the amount of expansion and contraction above and below the bellows side wall. The inclination of can be changed.
Further, the bathtub disclosed in Japanese Utility Model Publication No. 6-37747 has two rows of guide rails attached to both side walls at an inclination different from that of the rear wall, and a plate body is inserted between the two rows of guide rails. The inclination of the backrest (rear wall) can be changed with. Also, as relaxing bathtubs, Japanese Patent Laid-Open Nos. 4-224756 and 6-141 are available.
As described in Japanese Patent Publication No. 996, there is known a bathtub in which a recumbent floor cloth or an airtight sheet is inclined and attached at an intermediate height of the bathtub body.

[0006]

However, the preferable inclination of the rear wall depends on the person's taste and age. Generally, in elderly people and people with disabilities, if the back wall has a gentle sloping surface, the body lifts up when bathing in the bathtub, causing the body to lose its balance and slip into the bath, which is bad. If this happens, a drowning accident may occur, so a bathtub with a steep rear wall is preferable for the elderly and physically handicapped, and a younger person is preferred because the gentle rear wall can be relaxed.

[0007] In a bathtub in which both side walls have a bellows-like shape, it is convenient because the inclination of the back wall can be changed according to the taste and age of a person, but the structure is complicated and the bellows folds There is a problem that scales and the like tend to adhere to the inside, and scales and the like that adhere to the bellows are difficult to remove. Also, in a bathtub having guide rails on both side walls, it is convenient to insert a plate body along the guide rails between the two rows of guide rails so that the inclination of the rear wall can be changed. This guide rail is inconvenient when you are taking a bath without using. Further, there is a problem that the scale is easily adhered between the two rows of guide rails and to the front and rear walls, and the scale is difficult to remove.

In a bathtub having a recumbent floor cloth or airtight sheet provided at an intermediate height of the bathtub body, the back of the bather can take a bath along the recumbent floor cloth or airtight sheet, so that the user can relax and feel comfortable. This recumbent floor cloth or airtight sheet is easily deformed, and it is attached to the middle of the bathtub in an inclined state. If you stand on the floor, the reclining floor cloth or the airtight sheet will be deformed and your legs will wander, and since it is not flat, your feet will not be stable and it will be difficult to enter the bathtub. Further, there is a problem that it is difficult to install the recumbent floor cloth and the airtight sheet in the bathtub, and it is difficult to clean because the structure is complicated. Therefore, an object of the present invention is to provide a bathtub in which the inclination of the rear wall can be easily changed, and moreover, the scale is unlikely to adhere and the scale can be easily removed even if the scale adheres. Another object of the present invention is to provide a bathtub that is easy to enter the bathtub and can be bathed in a relaxed manner.

[0009]

SUMMARY OF THE INVENTION The present invention is made to achieve the above object, and the invention according to claim 1 is a bowl-shaped structure comprising both side walls, a front wall, a rear wall and a bottom surface. In a bathtub consisting of a bathtub body and a brim portion that protrudes substantially parallel to the outer direction at the upper end of the bathtub body, armrests are provided on both side walls, and the rear wall is a gently sloping surface. A locking recess is provided in the vicinity of the boundary, and between this locking recess and the armrest and the rear wall, an almost L-shaped backrest is provided, one piece of the inverted L-shape is almost horizontal and the other piece is rear wall. It is slanted at a steeper angle, bridged, and detachably attached.

According to the second aspect of the present invention, a fluid inlet / outlet and a sheet-like elastic member covering the fluid inlet / outlet are provided on the bottom surface of the bathtub according to the first aspect, and the fluid is let in / out from the fluid inlet / outlet. The sheet-shaped stretchable body is inflatable and contractible by means of, and when a fluid is put into the sheet-shaped stretchable body and inflated, the shape of the upper surface of the expanded sheet-shaped stretchable body has the legs bent to take a bath. It has a mountain shape along the back side of the foot. The foot in the invention according to claim 2 means a portion extending downward from the waist. or,
The invention according to claim 3 is such that a substantially central bent portion of a substantially inverted L-shaped backrest used in the bathtub according to claim 1 or 2 is foldable.

(Operation) In the bathtub of the present invention, a backrest having a substantially inverted L shape is provided between the locking recess and the armrest and the rear wall by the inverted L.
Since one piece of the letter shape is almost horizontal and the other piece is inclined at a steeper angle than the rear wall and is attached and detached, it is suitable for people who like a gentle rear wall, for example, for young people. If necessary, remove the backrest and take a bath. Then, since the back wall of the bathtub is a gently sloping surface, you can take a relaxing and comfortable bath.

If the rear wall has a steep slope, for example, in the case of an elderly person or a physically handicapped person, a bath with a substantially inverted L-shaped backrest is attached. Then, since an approximately L-shaped backrest having a steeper angle than the back wall is attached in front of the back wall of the bathtub, it is possible to take a bath while leaning on this steep backrest. In addition, since this backrest is attached by hanging it from the locking recess provided near the boundary between the rear wall and the collar between the armrest and the rear wall, in order to attach this backrest,
Unlike the conventional bathtub, it is not necessary to attach a fixture such as a guide rail to the side wall. Therefore, the side wall of the bathtub remains a smooth surface, and it is difficult for the scale to adhere to it, and even if the scale is attached to the side wall, it is easy to clean.

According to the second aspect of the present invention, a bather enters and leaves the bath by drawing fluid from the fluid inlet / outlet to contract the sheet-like stretchable body. Then, in order to support the load of the bather on the flat floor below the sheet-shaped elastic body even if the bather puts in and puts the sole of the foot on the contracted sheet-shaped elastic body,
The feet are stable and do not sway, making it easy to get in and out of the bathtub. In addition, when a fluid is introduced into the sheet-shaped elastic body from the fluid inlet / outlet after bathing, the shape of the surface of the expanded sheet-shaped elastic body becomes a mountain shape along the back side of the foot of the bather who bathes by bending the foot. Therefore, if the bather puts the back side of the bent foot on the sheet-shaped contraction body, the sheet-shaped contraction body supports the back side of the knee joint so that the user can relax in the bath.

According to the third aspect of the present invention, since the bent portion at the substantially center of the substantially L-shaped backrest is foldable, when this backrest is not used, it can be folded into a smaller shape. Therefore, it is easy to store.

[0015]

Next, embodiments of the present invention will be described. (Embodiment 1) FIGS. 1 to 3 show an embodiment of the bathtub of the present invention. FIG. 1 (a) is a perspective view of the bathtub, (b) is a plan view of the bathtub, and (c) is (b). 2 is a sectional view taken along line AA of FIG.
Is a cross-sectional view showing an enlarged portion B of FIG. 1 (c), and FIG. 3 shows a state of use of the bathtub, and (a) is an explanatory view showing a state of bathing without using a backrest, (b) ) Is an explanatory view showing a state where the user is bathing using a backrest.

Reference numeral 1 is a bath made of glass fiber reinforced polyester resin. The bath 1 has side walls 21, 21 and a front wall 22.
A bowl-shaped bathtub body 2 formed of a rear wall 23 and a bottom surface 24, and a collar 3 protruding substantially horizontally from the upper end of the bathtub body 2 are integrally molded. The size of the collar 3 from one end to the other is 1400 mm × 800 mm,
The size of the upper surface of the bathtub body is 1200 mm x 650 mm,
The depth is 550 mm. Further, the rear wall 23 has a gentle slope of approximately 75 °. Left and right side walls 21, 21
The front wall 22 and the front wall 22 have a steep slope close to 90 °. An armrest 25 projecting inward is provided at a position near the rear wall 23 on both side walls 21, 21. Further, a recessed locking recess 4 is provided near the boundary between the rear wall 23 and the collar 3.

Numeral 5 is an almost inverted L-shaped backrest, and this backrest 5 is divided into a substantially central bent portion 55 and divided into one piece 51 and the other piece 52, as shown in FIG. Is
This is attached and attached by a hinge 56 so that it can be folded. This backrest 5 is, as shown in FIG.
It can be mounted by bridging from the locking recess 4 between the rear wall 23 and the armrest 25. In addition, when the backrest 5 is attached in this manner, one piece 5 of the inverted L shape is formed.
1 becomes almost horizontal, and the other piece 52 becomes a steep inclined surface close to about 90 °. 59 is a pillow mat, and this pillow mat 59 has a shape that can be fitted into the locking recess 4. . 9 is a bather.

Next, a method of using this bathtub will be described. First, in the case of a bather 9 who likes the bathtub 1 in which the leaning wall (rear wall 23) has a gentle slope, the backrest 5 is removed, and the pillow mat 59 is fitted into the locking recess 4 to be attached. 3A, enter the bathtub 1, use the pillow mat 59 as a pillow, and rest the armrest 25 on the armrest to relax and take a bath. At this time, since this backrest 5 is not used, it is folded and stored. Next, in the case of a bather 9 who likes the bathtub 1 in which the leaning wall has a steep inclination, as shown in FIG. 1C, the backrest 5 is locked from the locking recess 4 to the rear wall 23 and the armrest 25. Mount it between the two. Then, one piece 51 of the backrest 5 becomes substantially horizontal, and the other piece 52 becomes almost vertical and is attached.

The bath 1 is filled with hot water, and the bath shown in FIG.
As shown in (b), the user enters the bathtub 1, puts his elbow on the armrest 25, leans on the backrest 5, and takes a bath. Then, backrest 5
Since the other piece 52 is attached as an inclined surface close to 90 °, the other piece 52 leans against the other piece 52 for bathing. In this way, it is convenient that the leaning wall can change the inclined surface such as the rear wall 23 and the backrest 5.
In addition, since the backrest 5 can thus be mounted by spanning from the locking recess 4 between the armrest 25 and the rear wall 23, a special mounting tool such as a conventional guide rail is provided. Therefore, it is not necessary to attach the scale to the side wall, and even if the scale is attached, it can be easily removed. Further, since the backrest 5 can be folded, it can be conveniently folded and stored when not in use.

(Second Embodiment) Next, another embodiment of the present invention will be described. 4 to 6 show another embodiment of the bathtub of the present invention. FIG. 4A is a plan view of the bathtub, FIG. 4B is a sectional view taken along the line CC of FIG. 4A, and FIG. (A) is a perspective view, (b)
FIG. 6A is a cross-sectional view taken along the line D-D of FIG. 6A, and FIG. 6 is a diagram illustrating a usage state of the bathtub, and FIG. 6A is an explanatory view illustrating a state in which the sheet-shaped stretchable body is contracted using a backrest; (B) is an explanatory view showing a state where the backrest is removed and the sheet-like elastic body is inflated to take a bath.

Reference numeral 1a denotes a glass fiber reinforced polyester resin bathtub. This bathtub 1a is a bowl-shaped bathtub body 2a having side walls 21a, 21a, a front wall 22a, a rear wall 23a and a bottom surface 24a, and a bathtub body 2a. It is integrally formed with a flange 3a that projects substantially horizontally from the upper end of the bath body 2a. A fluid inlet / outlet port 29a is provided substantially at the center of the bottom surface 24a. The size of the collar 3a from one end to the other is 1400 mm x 800 mm, the size of the bath body is 1200 mm x 650 mm, and the depth is 550 mm.
It is. The rear wall 23a has a gentle slope of about 75 °. The left and right side walls 21, 21 and the front wall 22a form a steep slope close to about 90 °. Side walls 2
1a and 21a are provided with armrests 25a protruding inward at locations near the rear wall 23a. Further, a recessed locking recess 4a is provided near the boundary between the rear wall 23a and the collar 3a.

5a is a substantially inverted L-shaped backrest, and this backrest 5a is divided into a substantially central bent portion 55a into one piece 51a and the other piece 52a, which is attached by a hinge 56a. It is attached so that it can be folded. As shown in FIG. 4B, the backrest 5a can be attached so as to extend from the locking recess 4a between the rear wall 23a and the armrest 25a. When the backrest 5a is attached in this manner, one piece 51a of the inverted L-shape becomes substantially horizontal, and the other piece 52a is almost 90.
It becomes an inclined surface close to °. 59a is a pillow mat, and this pillow mat 59a has a shape that can be fitted into the locking recess 4a. .

Reference numeral 6a is a rubber sheet-like elastic member. Then, a fluid inlet / outlet port 29 is provided on the bottom surface 24a of the bath body 2a.
Length 400 mm to 600 mm with width a about the center, width 3
A substantially rectangular frame body 61a having a U-shaped cross section of 00 mm to 450 mm is integrally mounted, and the peripheral edge of the sheet-shaped stretchable body 6a is mounted in the U-shaped cross section of the frame body 61a. Therefore, this sheet-shaped elastic body 6a
It is provided so as to cover 9a. Then, when pressurized water (tap water) is introduced from the fluid inlet / outlet port 29a, the sheet-shaped stretchable body 6a expands, and the sheet-shaped stretchable body 6a is expanded.
As shown in (b) of FIG. 6, the shape of the upper surface of each of the sheets becomes a mountain shape along the back surface of the foot of the bather who bends the foot, and when the water is drained, the sheet-shaped stretchable body 6a contracts to form this sheet-shaped sheet. Stretchable body 6
The upper surface of a has substantially the same height as the bottom surface 24a as shown in FIG. The surface of the sheet-shaped contraction body 6a is provided with a large number of non-slip irregularities.

Reference numeral 8a is a faucet. 81a is a hot water pipe,
The hot water pipe 81a is connected to the faucet 8a. Reference numeral 82a is a water pipe, and this water pipe 82a branches off midway, one of which is connected to the faucet 8a and the other of which is connected to the fluid inlet / outlet port 29a through the switching valve 85a. When the switching valve 85a is switched to the fluid inlet / outlet port 29a side by a switch (not shown), water enters the sheet-shaped stretchable body 6a and can expand the sheet-shaped stretchable body 6a.
When switched to the 6a side, the water contained in the sheet-shaped stretchable body 6a flows out through the drainage pipe 86a and the sheet-shaped stretchable body 6a contracts. Further, when the handle 89a of the faucet 8a is appropriately rotated and opened, the amount of hot water from the hot water pipe 81a and the amount of water from the hot water pipe 82a can be adjusted so that hot water of an appropriate temperature comes out from the hot water tap 8a. ing. 9a is a bather.

Next, a method of using this bathtub will be described. First, the bathtub 1a in which the leaning wall (rear wall 23a) has a gentle slope
If you like bather 9a, remove backrest 5,
The pillow mat 59a is fitted into the locking recess 4a. Then, the switching valve 8a is switched to the drain pipe 86a side to drain water from the sheet-shaped stretchable body 6a to shrink the sheet-shaped stretchable body 6a,
The handle 89a is appropriately rotated to adjust the temperature of the hot water coming out of the faucet 8a to an appropriate amount and put it in the bathtub. On this occasion,
Since the backrest 5a is not used, it is folded and stored. In this way, the bather 9a enters the bathtub 1. Then, when the sheet-shaped stretchable body 6a is contracted, since the surface and the bottom surface 24a of the sheet-shaped stretchable body 6a are formed at substantially the same height, it is easy to enter. Further, since the sheet-shaped stretchable body 6a is provided with a large number of irregularities on the surface, it is difficult to slip.

When the user takes a bath, bends his foot, and switches the switching valve 8a to the fluid inlet / outlet port 29a side with a switch (not shown), the sheet-like elastic body 6a extends along the rear side of the foot as shown in FIG. 6B. Since it expands into a shape, it is possible to put a foot on the sheet-shaped stretchable body 6a, use the pillow mat 59a as a pillow, and rest the armrest on the armrest 25a to relax and take a bath. Bathtub 1
When exiting from a, the switching valve 8a
When switching to the drain pipe 86a side, the sheet-shaped stretchable body 6a
The water inside is drained, the sheet-shaped stretchable body 6a contracts, and the height becomes almost the same as the bottom surface 24a, so it is easy to stand up and get out of the bath. In this way, even when leaving the bathtub 1, since the floor surface 12 is substantially flat, it is easy to stand up and exit.

Next, in the case of the bather 9a who likes the bathtub 1a where the leaning wall has a steep inclination, as shown in FIG.
Secure the backrest 5a from the locking recess 4a to the rear wall 23a and the armrest 25.
Attach it by hanging it over a. Then, backrest 5a
One piece 51a is attached almost horizontally, and the other piece 52a is attached with an inclined surface close to 90 °. Then, the bathtub 1a where the leaning wall (rear wall 23a) has a gentle slope
Like the bather 9a who likes the sheet-like stretchable body 6
A is shrunk, and hot water is put in the bathtub 1a for bathing. Then, since the surface and the bottom surface 24a of the sheet-shaped stretchable body 6a have substantially the same height, it is easy to enter. Further, since the sheet-shaped stretchable body 6a is provided with a large number of irregularities on the surface, it is difficult to slip.

Thereafter, as shown in FIG. 6 (a), the user sits down, inflates the sheet-like elastic body 6a, and puts his / her foot on the sheet-like elastic body 6a to support the inside of the knee joint. Place your arm on the armrest 25a to relax and take a bath. Further, when cleaning, the backrest 5a is removed, and the sheet-like elastic body 3 is made substantially the same as the floor surface 12, so that cleaning can be easily performed. In this way, it is convenient that the leaning wall can change the inclined surfaces such as the rear wall 23a and the backrest 5a. In addition, since the backrest 5a can thus be mounted by straddling it from the locking recess 4a between the elbow cradle 25a and the rear wall 23a, a special mounting tool such as a conventional guide rail is provided. Therefore, it is not necessary to attach the scale to the side wall, and even if the scale is attached, the scale can be easily removed. Further, since the backrest 5a can be folded, it can be conveniently folded and stored small when not in use.

[0029]

In the bathtub of the present invention, a backrest having a substantially inverted L shape is provided between the locking recess and the armrest and the rear wall, and one piece of the inverted L shape is substantially horizontal and the other piece is a rear wall. Since it is slanted at a steeper angle, it is laid across and attached detachably, so if you like a gentle back wall, for example, youths can take a bath with the backrest removed, or suddenly. For example, in the case of an elderly person or a physically handicapped person, a back wall having a substantially inverted L-shape can be attached for bathing, which is convenient. Also, since this backrest is installed by hanging it from the locking recess provided near the boundary between the rear wall and the collar between the armrest and the rear wall, the side wall of the bathtub remains a smooth surface, and the scale etc. Is difficult to attach, and if the scale is attached to the side wall, it is easy to clean.

According to the second aspect of the present invention, when the fluid is drawn out from the fluid inlet / outlet to contract the sheet-shaped elastic body, even if a foot is placed on the sheet-shaped elastic body, a flat lower side of the sheet-shaped elastic body is obtained. Since the load is supported on the floor, the feet are stable and do not sway, making it easy to get in and out of the bathtub. Further, when a fluid is introduced into the sheet-shaped elastic body from the fluid inlet / outlet, the surface of the expanded sheet-shaped elastic body is formed into a mountain shape along the back side of the foot of the bather who bathes by bending the foot. So, if you put your legs bent by the sheet-shaped elastic body on this sheet-shaped elastic body, it will support the inside of the knee joint and you can relax and take a comfortable bath. According to the third aspect of the present invention, since the bent portion at the substantially center of the L-shaped backrest is foldable, when the backrest is not used, it can be folded and stored in a small shape. .

[Brief description of the drawings]

1 shows an embodiment of a bathtub of the present invention, (a) is a perspective view of the bathtub, (b) is a plan view of the bathtub, and (c) is (b).
FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 2 is a cross-sectional view showing an enlarged portion B of FIG.

FIG. 3 is a diagram showing a state of using the bathtub, (a) is an explanatory view showing a state of bathing without using a backrest, (b)
FIG. 3 is an explanatory view showing a state where a backrest is used for bathing.

FIG. 4 shows another embodiment of the bath according to the present invention, which is (a)
Is a plan view of the bathtub, and (b) is a sectional view taken along line C-C of (a).

FIG. 5 shows a state where the sheet-shaped elastic body is inflated,
(A) is a perspective view, (B) is a sectional view taken along the line D-D of (A).

[Fig. 6] Fig. 6 is a view showing a use state of the bathtub, (a) is an explanatory view showing a state where the sheet-like elastic body is contracted by using the backrest, and (b) is a sheet-like contraction without using the backrest. It is an explanatory view showing the state where the body is inflated and bathing.

FIG. 7 shows an example of a conventional bathtub, (a) is an explanatory view showing a state of bathing in a Japanese style bathtub, (b) is an explanatory view showing a state of bathing in a Japanese and Western eclectic bathtub, (c) FIG. 3 is an explanatory view showing a state where a bath is taken in a Western-style bathtub.

[Explanation of symbols]

 1, 1a Bathtub 2, 2a Bathtub body 21, 21a Side wall 22, 22a Front wall 23, 23a Rear wall 24, 24a Bottom surface 25, 25a Armrest 29a Fluid inlet / outlet 3, 3a Collar 4, 4a Locking recess 5, 5a Backrest 6a Sheet-shaped stretchable body 8a Faucet 81a Hot water pipe 82a Water pipe 85a Switching valve 86a Drain pipe 9,9a Bather

Claims (3)

[Claims] 1. A bathtub comprising a bowl-shaped bathtub body composed of both side walls, a front wall, a rear wall and a bottom surface, and a collar portion projecting substantially horizontally outwardly at the upper end of the bathtub body. An armrest is provided, the rear wall is a gently inclined surface, and a locking recess is provided in the vicinity of the boundary between the rear wall and the collar. From this locking recess, between the armrest and the rear wall, a substantially inverted L-shape is formed. The bathtub is characterized in that one of the inverted L-shaped pieces is substantially horizontal and the other piece is inclined at a steeper angle than the rear wall, and the backrest is attached and detachably attached. 2. A bottom surface is provided with a fluid inlet / outlet and a sheet-like elastic body covering the fluid inlet / outlet, and the sheet-like elastic body is inflatable / contractible by letting a fluid in / out from the fluid inlet / outlet. When the fluid is put into the elastic body and inflated, the shape of the upper surface of the expanded sheet elastic body is made into a mountain shape along the back side of the foot of the bather who bathes by bending the foot. The bathtub according to claim 1, which is characterized in that. 3. A bent portion in the center of a backrest having an inverted L-shape is made foldable.
Or the bathtub described in 2.