Facial cleanser

Abstract

The present invention provides a washbasin that reduces the risk of damage to the bowl surface, even when an object is dropped into the bowl. [Solution] The present invention is a washbasin (1) comprising a bowl surface (2) having a bottom surface (2a) provided with a drain (6) and a side wall surface formed with an overflow hole (4), and an overflow channel (8) connecting the overflow hole and the area below the drain, wherein the side wall surface consists of a close side wall surface (2e) positioned close to the drain and a non-close side wall surface (2b) not positioned close to the drain, the overflow hole is provided on the non-close side wall surface of the side wall surface, and the overflow channel comprises a first overflow channel (8a) provided on the back side of the non-close side wall surface where the overflow hole is provided, and a second overflow channel (8b) that communicates with the first overflow channel and extends from the back side of the close side wall surface downward to the drain.

Description

Technical Field

[0001] The present invention relates to a washbasin, and particularly to a washbasin provided with an overflow hole.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2021-25203 (Patent Document 1) describes a drainage device. In this Patent Document 1, a drainage port is provided on the back side of the bowl portion, while an overflow hole is provided on the side wall surface on the front side of the bowl portion, and an embodiment is described in which an overflow channel extends from the overflow hole to the drainage port through the lower side of the bottom surface of the bowl portion. Thus, when the overflow hole is provided on the side wall surface on the front side of the bowl portion, there is an advantage that the overflow hole is difficult to enter the user's field of vision and the bowl portion can be made excellent in appearance.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the bowl portion described in Patent Document 1 has a problem in that it increases the risk of damaging the bowl surface during use. Specifically, in the bowl portion described in Patent Document 1, the overflow channel extends across the underside of the bottom surface of the bowl portion. Furthermore, the portion of the bowl portion where the overflow channel is provided is constructed with a double-wall structure, and in such a double-wall structure, the thickness of the ceramic is often made thinner. However, objects may be accidentally dropped into the bowl portion during use, and if the dropped object hits the part of the bowl portion where the thickness of the bowl portion is thin, the risk of damage to the bowl portion increases. For example, if a cosmetic bottle or the like is dropped into the portion of the bottom surface of the bowl portion where the overflow channel is provided on the underside, the risk of the bowl portion cracking increases.

[0005] Therefore, the present invention aims to provide a washbasin that can reduce the risk of damage to the bowl surface, even when an object is dropped onto the bowl surface. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a washbasin equipped with an overflow hole, comprising: a bowl surface having a bottom surface provided with a drain outlet and a side wall surface provided around the bottom surface and having an overflow hole formed thereon; and an overflow channel provided on the back side of the bowl surface and connecting the overflow hole and the area below the drain outlet, wherein the side wall surface consists of a close side wall surface located close to the drain outlet and a non-close side wall surface not located close to the drain outlet, the overflow hole is provided on the non-close side wall surface of the side wall surface, and the overflow channel comprises a first overflow channel provided on the back side of the non-close side wall surface provided with the overflow hole, and a second overflow channel communicating with the first overflow channel and extending downward from the back side of the close side wall surface to the area below the drain outlet.

[0007] According to the present invention configured in this manner, the first overflow channel is provided on the back side of a non-proximity side wall that is not located close to the drain outlet. Since the non-proximity side wall has a steeper slope than the bottom surface, the impact force acting on it is mitigated even if a falling object collides with it. As a result, even if an object collides with a non-proximity side wall on which the first overflow channel is provided on the back side, the risk of damage to the bowl surface can be reduced. On the other hand, the second overflow channel extends from the back side of the proximity side wall downwards from the drain outlet, so the distance is shorter. Therefore, even if an object is dropped from above the bowl surface, the probability of the object colliding with the bowl surface located above the second overflow channel is low, and the risk of damage to the bowl surface can be reduced.

[0008] In the present invention, preferably, the floor surface of the first overflow channel is located below the connection point where the non-proximal side wall surface, which is provided with the overflow hole, and the bottom surface of the bowl surface connect.

[0009] According to the present invention configured in this manner, since the floor surface of the first overflow channel is located below the connection point where the non-proximal side wall surface and the bottom surface of the bowl surface connect, the height from the floor surface of the first overflow channel to the overflow hole can be increased, and the cross-sectional area of ​​the flow path of the first overflow channel can be increased.

[0010] In the present invention, preferably, the first overflow channel is provided outside the outer circumference of the bottom surface of the bowl.

[0011] With the present invention configured in this way, since the first overflow channel is provided outside the outer circumference of the bottom surface of the bowl, the first overflow channel is not provided on the underside of the bottom surface of the bowl, and the risk of damage to the bowl surface can be further reduced.

[0012] In the present invention, preferably, a rim portion with a hollow interior is provided at the upper end of the side wall surface, and the space within this rim portion is separated from the space within the first overflow channel.

[0013] With the present invention configured in this way, since the space within the rim and the space within the first overflow channel are separated, a large, interconnected space is not provided on the back side of the non-proximal side wall, and the strength of the bowl surface can be increased.

[0014] In the present invention, preferably, the overflow channel includes a channel narrowing section in the middle of the channel from the overflow hole to below the drain outlet, where the cross-sectional area of ​​the channel is narrowed.

[0015] When soap, detergent, etc. are used in a washbasin, soap, etc. that remains near the drain may be foamed up by the water flowing into the drain. Then, the foam generated near the drain may flow back up through the overflow channel connected to the drain to the overflow hole. With the present invention configured as described above, a channel narrowing section with a narrowed channel cross-sectional area is provided in the middle of the overflow channel from the overflow hole to below the drain, so that the backflow of foam that has passed through the overflow channel can be suppressed.

[0016] In the present invention, preferably, the overflow channel is sloped such that its floor surface is continuously lower from the upstream side to the downstream side.

[0017] According to the present invention configured in this way, the floor surface of the overflow channel is sloped to become continuously lower from the upstream side to the downstream side. As a result, water flowing in from the overflow hole is less likely to remain in the overflow channel, and the incoming water can be quickly discharged. This makes it possible to keep the inside of the overflow channel clean.

[0018] In the present invention, preferably, legs are provided below the overflow waterway such that the floor surface of the overflow waterway continuously slopes downward from the upstream side to the downstream side.

[0019] According to the present invention configured as described above, legs are provided below the overflow waterway such that the floor surface of the overflow waterway continuously slopes downward from the upstream side to the downstream side. Therefore, even if the floor surface of the overflow waterway is inclined, the height of the lower end of the legs can be made constant by changing the length of the legs so as to compensate for this. As a result, the washbasin during manufacturing can be stably placed on the stand, and the manufacturing efficiency can be improved.

Effects of the Invention

[0020] According to the washbasin of the present invention, even when an object is dropped onto the bowl surface, the risk of damage to the bowl surface can be reduced.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of a washbasin according to an embodiment of the present invention. [Figure 2] It is a plan view of a washbasin according to an embodiment of the present invention. [Figure 3] In the washbasin according to an embodiment of the present invention, it is a cross-sectional view taken along line III-III of FIG. 2. [Figure 4] In the washbasin according to an embodiment of the present invention, it is a cross-sectional view taken along line IV-IV of FIG. 2. [Figure 5] In the washbasin according to an embodiment of the present invention, it is a cross-sectional view taken along line V-V of FIG. 2. [Figure 6] It is a perspective view of a washbasin according to an embodiment of the present invention as viewed from below.

Modes for Carrying Out the Invention

[0022] Next, a washbasin according to an embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 is a perspective view of a washbasin according to an embodiment of the present invention. Figure 2 is a plan view of a washbasin according to an embodiment of the present invention. Figure 3 is a cross-sectional view along line III-III in Figure 2. Figure 4 is a cross-sectional view along line IV-IV in Figure 2. Figure 5 is a cross-sectional view along line VV in Figure 2. Figure 6 is a perspective view of a washbasin according to an embodiment of the present invention, viewed from below.

[0023] As shown in Figure 1, the washbasin 1 according to an embodiment of the present invention is made of ceramic and has a bowl surface 2 with a bottom surface 2a and side wall surfaces 2b, 2c, 2d, and 2e provided around the bottom surface 2a. In this embodiment, an overflow hole 4 is provided on the front side (the side where the user stands) side wall surface 2b, and a drain outlet 6 is provided on the bottom surface 2a near the corner where the rear side wall surface 2d and the right side wall surface 2e intersect. Furthermore, as shown in Figure 2, an overflow channel 8 is provided on the back side of the bowl surface 2, connecting the overflow hole 4 and the area below the drain outlet 6.

[0024] The washbasin 1 of this embodiment is configured to be installed on a washbasin (not shown) or the like by dropping it into an opening 10a (Figure 3) provided in a counter board 10. The washbasin 1 is configured to receive water discharged from a faucet (not shown) located above it on the bowl surface 2 and discharge it through a drain 6. When the water level in the bowl surface 2 rises above the overflow hole 4, the water in the bowl surface 2 flows from the overflow hole 4 into the overflow channel 8. The water that flows into the overflow channel 8 is guided below the drain 6 and discharged into a drain pipe D (Figure 4) connected to the lower side of the drain 6. This prevents the water in the bowl surface 2 from overflowing.

[0025] As shown in Figures 1 and 2, the washbasin 1 of this embodiment has a generally flat and roughly rectangular bottom surface 2a surrounded by four side walls 2b, 2c, 2d, and 2e, and the bowl surface 2 as a whole is configured in a roughly rectangular parallelepiped shape. In this embodiment, the drain 6 is located at the back right of the bottom surface 2a, and the right side wall surface 2e and the rear side wall surface 2d, which are close to the drain 6, constitute "proximity side walls" that are positioned close to the drain 6. The left side wall surface 2c and the front side wall surface 2b, which are not positioned close to the drain 6, constitute "non-proximity side walls" that are not positioned close to the drain 6.

[0026] Furthermore, in this embodiment, the overflow hole 4 is formed in the left-right center of the front side wall surface 2b, which is a non-proximal side wall surface. In this embodiment, the overflow hole 4 is configured as an elongated oval shape that is long in the horizontal direction. By providing the overflow hole 4 on the front side wall surface 2b in this way, the overflow hole 4, which is prone to dirt and other contaminants, is less likely to be in the line of sight of the user standing in front of the washbasin 1, thereby improving the aesthetic appearance of the washbasin 1.

[0027] Next, as shown in Figures 3 and 4, a rim portion 12 is formed on the upper edge of the bowl surface 2. This rim portion 12 has a roughly triangular cross-section and is provided around the entire upper edge of the bowl surface 2. The washbasin 1 is supported by engaging the rim portion 12 with the edge of the opening 10a in the counter board 10. That is, the washbasin 1 is supported by the counter board 10 with the portion below the rim portion 12 recessed into the counter board 10. Furthermore, a roughly triangular cavity 12a is formed inside the rim portion 12.

[0028] Furthermore, as shown in Figure 2, an overflow channel 8 is provided on the back side of the non-proximal side wall surface 2b and the proximal side wall surface 2e, connecting the overflow hole 4 to the area below the drain outlet 6. In other words, in this embodiment, the overflow channel 8 is configured in a substantially L-shape, passing through the back side of the front side wall surface 2b and the back side of the right side wall surface 2e. In addition, the overflow channel 8 extends from the back side of the right side wall surface 2e, passing under the bottom surface 2a to the area below the drain outlet 6.

[0029] Here, as shown in Figure 2, in this embodiment, the portion of the overflow channel 8 provided on the back side of the front side wall surface 2b constitutes the first overflow channel 8a provided on the back side of the non-proximal side wall surface. That is, as shown in Figure 3, the first overflow channel 8a is composed of two wall surfaces extending almost vertically downward from the back side of the side wall surface 2b, and a wall surface extending almost horizontally that connects the lower ends of these wall surfaces.

[0030] Furthermore, as shown in Figure 2, the portion of the overflow channel 8 that extends from the back side of the right side wall surface 2e, through the underside of the bottom surface 2a, and downward to the drain outlet 6 constitutes the second overflow channel 8b, which extends from the back side of the adjacent side wall surface downward to the drain outlet 6. That is, as shown in Figure 4, the second overflow channel 8b is formed by a wall surface formed on the underside of the bottom surface 2a so as to surround the drain outlet 6 provided in the bottom surface 2a. In this way, the second overflow channel 8b communicates with the downstream end of the third overflow channel 8c and extends downward to the drain outlet 6.

[0031] Furthermore, as shown in Figure 2, the portion of the overflow channel 8 located on the back side of the right-hand side wall 2e constitutes a third overflow channel 8c located on the back side of the adjacent side wall. This third overflow channel 8c consists of two wall surfaces extending almost vertically downward from the back of the side wall 2e, and a wall surface extending almost horizontally that connects the lower ends of these wall surfaces, and communicates with the downstream end of the first overflow channel 8a.

[0032] As a result, the water flowing in from the overflow hole 4 is guided downwards to the drain outlet 6 through the first overflow channel 8a, the third overflow channel 8c, and the second overflow channel 8b, in that order. Also, as shown in Figure 2, the first overflow channel 8a, which is located on the back side of the front side wall surface 2b, and the third overflow channel 8c, which is located on the back side of the right side wall surface 2e, are located outside the outer circumference of the bottom surface 2a of the bowl surface 2. Furthermore, the second overflow channel 8b, which extends downwards to the drain outlet 6 from the right side wall surface 2e, is extremely short because it extends downwards to the drain outlet 6 from the side wall surface 2e, which is the adjacent side wall surface to the drain outlet 6.

[0033] As a result, the overflow channel 8 provided on the underside of the bottom surface 2a of the bowl surface 2 becomes extremely short, and the risk of damage to the bowl surface 2 in the area where the overflow channel 8 is formed in the event of an object being accidentally dropped is greatly reduced. On the other hand, although overflow channels 8 are provided on the backs of the side wall surfaces 2b and 2e, the impact force exerted by a dropped object is significantly smaller on the inclined side wall surface than on the nearly horizontal bottom surface 2a, thus reducing the risk of damage to the side wall surface due to a dropped object.

[0034] Furthermore, as shown in Figure 3, the bottom surface 2a of the bowl surface 2 and the side wall surface 2b, which is a non-proximal side wall surface, are connected by a connecting portion 14. That is, the bottom surface 2a, which is generally flat and oriented almost horizontally, and the side wall surface 2b, which is generally flat and inclined, are connected by a curved connecting portion 14. In this embodiment, the bottom surface 2a of the bowl surface 2 and the four side wall surfaces 2b, 2c, 2d, and 2e formed around it are all connected by a curved connecting portion 14. In this specification, the "outer circumference" of the bottom surface 2a means a closed curve connecting the connecting portions 14 of the bottom surface 2a and each side wall surface. Note that when the bottom surface and / or each side wall surface of the bowl surface are curved, the portion where the radius of curvature between the bottom surface and the side wall surface becomes rapidly smaller corresponds to the connecting portion 14 between the bottom surface and the side wall surface.

[0035] As shown in Figure 3, in this embodiment, the floor surface 16 of the first overflow channel 8a is located below the connection portion 14 where the side wall surface 2b, which is a non-proximal side wall surface where the overflow hole 4 is provided, and the bottom surface 2a of the bowl surface 2 are connected. Furthermore, the floor surface 16 of the first overflow channel 8a is sloped such that it is highest in the portion below the overflow hole 4 (upstream end) and lowest in the portion connected to the third overflow channel 8c (Figure 2) (downstream end).

[0036] Similarly, the floor surface 16 of the third overflow channel 8c is sloped such that it is highest at the point where it connects to the first overflow channel 8a (upstream end) and lowest at the point where it connects to the second overflow channel 8b (Figure 5) (downstream end). Furthermore, the floor surface 16 of the second overflow channel 8b is sloped such that it is highest at the point where it connects to the third overflow channel 8c (upstream end) and lowest below the drain outlet 6 (downstream end). In this way, the floor surface 16 of the overflow channels 8 is sloped to continuously decrease from the upstream side to the downstream side.

[0037] Furthermore, as shown in Figure 2, the width of the overflow channel 8 is wide at the upstream end near the overflow hole 4, narrows downstream thereto, and widens again in the portion of the second overflow channel 8b connected below the drain outlet 6. Thus, the overflow channel 8 is equipped with a channel narrowing section 18 in the middle of the flow path from the overflow hole 4 to below the drain outlet 6, where the cross-sectional area of ​​the flow path is narrowed. In other words, in this embodiment, the downstream portion of the first overflow channel 8a and the entire third overflow channel 8c of the overflow channel 8 are made into a channel narrowing section 18 where the cross-sectional area of ​​the flow path is narrowed.

[0038] In this case, when soap, detergent, etc. are used in the washbasin 1, the soap, etc. that remains near the drain 6 may be foamed up by the water flow into the drain 6. As in the washbasin 1 of this embodiment, by providing a flow path narrowing section 18 in the middle of the overflow water channel 8, it is possible to suppress the backflow of foam through the overflow water channel towards the overflow hole 4.

[0039] Furthermore, as shown in Figures 3 and 5, a first overflow channel 8a and a third overflow channel 8c are provided on the back sides of the side wall surfaces 2b and 2e, respectively. On the other hand, as described above, a rim portion 12 is provided on the outside of the upper end of the bowl surface 2 (the back side of the bowl surface 2), and the inside of this rim portion 12 is a cavity 12a. However, the space in the first overflow channel 8a provided on the back side of the side wall surface 2b and the space in the rim portion 12 are separated and do not communicate (Figure 3). Similarly, the space in the third overflow channel 8c provided on the back side of the side wall surface 2e and the space in the rim portion 12 are separated and do not communicate (Figure 5).

[0040] In this way, since the space within the rim portion 12, the space within the first overflow channel 8a, and the space within the third overflow channel 8c are separated, a large, interconnected space is not provided on the back side of the side wall, and the strength of the bowl surface 2 can be increased.

[0041] Next, as shown in Figure 6, the washbasin 1 of this embodiment is provided with base portions 20 and 22 that protrude downward from the underside. The base portion 20 is a substantially L-shaped portion that extends downward from the back surface of the side wall surfaces 2b and 2e of the bowl surface 2. The space inside the base portion 20 constitutes the first overflow water channel 8a and the third overflow water channel 8c (Figures 3 to 5). In other words, the wall surface that forms the overflow water channel 8 provided on the back side of the side wall surfaces 2b and 2e constitutes the base portion 20.

[0042] On the other hand, the base portion 22 is a roughly J-shaped section that extends downward from the back surface of the side wall surfaces 2d, 2c, and 2b of the bowl surface 2. Although a cavity is formed inside the base portion 22, this cavity is not used as a water conduit.

[0043] Furthermore, the lower end of the base portion 20 is provided with two parallel-extending legs 20a, and the lower end of the base portion 22 is formed with two parallel-extending legs 22a. These legs 20a and 22a are formed to allow the washbasin 1 to be placed on a horizontal stand (not shown) during the manufacturing process of the washbasin 1, and the lower end surfaces of these legs 20a and 22a come into contact with the stand. For this reason, the lower end surfaces of each leg 20a and 22a are generally located within the same plane.

[0044] Furthermore, the height h of the leg portion 20a (Figures 3 and 4) is configured to gradually decrease from the upstream side to the downstream side of the overflow channel 8. In other words, a groove 20b with a roughly U-shaped cross-section is formed on the lower end surface of the base portion 20, and the depth of this groove 20b (corresponding to the height h of the leg portion 20a) becomes shallower from the upstream side to the downstream side of the overflow channel 8. As a result, the floor surface 16 of the overflow channel 8 located on the opposite side of the groove 20b at the lower end of the leg portion 20a becomes continuously lower from the upstream side to the downstream side of the overflow channel 8, making it easier for water in the overflow channel 8 to flow from the overflow holes 4 at both upper ends towards the drain outlet 6. Thus, the leg portion 20a is provided below the overflow channel 8 so that the floor surface 16 of the overflow channel 8 becomes continuously lower from the upstream side to the downstream side.

[0045] Similarly, a groove 22b with a substantially U-shaped cross-section is formed on the lower end surface of the base portion 22, but the depth of this groove 22b is substantially constant throughout the entire base portion 22. That is, in this embodiment, the height of the leg portion 22a provided at the lower end of the base portion 22 is substantially constant.

[0046] Next, the operation of the washbasin 1 according to an embodiment of the present invention will be described. First, when water is discharged from a faucet (not shown) located above the washbasin 1, the bowl surface 2 receives the water and discharges it through the drain 6. Also, when water flows into the bowl surface 2 with the drain 6 plugged (not shown), and the water level in the bowl surface 2 rises above the overflow hole 4, the water in the bowl surface 2 flows from the overflow hole 4 into the overflow channel 8. The water that flows into the overflow channel 8 flows in the order of the first overflow channel 8a, the third overflow channel 8c, and the second overflow channel 8b (Figure 2), is guided below the drain 6, and is discharged into the drain pipe D (Figure 4) connected to the lower side of the drain 6. This prevents the water in the bowl surface 2 from overflowing.

[0047] Furthermore, the floor surface 16 of the overflow channel 8 (Figures 3 and 4) is sloped to continuously decrease in elevation from the upstream side to the downstream side. As a result, water flowing into the overflow channel 8 is less likely to stagnate within the overflow channel 8 and is quickly guided to the area below the drain outlet 6. In addition, the overflow channel 8 is provided with a channel narrowing section 18 (Figure 2) in the middle of the flow path from the overflow hole 4 to below the drain outlet 6, where the cross-sectional area of ​​the flow path is narrowed. Therefore, even if foam is generated near the drain outlet 6, it is possible to prevent the foam from flowing back through the overflow channel 8 and reaching the overflow hole 4.

[0048] In the washbasin 1 of the embodiment of the present invention, the first overflow channel 8a is provided on the back side of the side wall surface 2b, which is a non-proximity side wall surface not located close to the drain 6. Since the side wall surface 2b has a steeper slope than the bottom surface 2a, the impact force acting when a falling object collides with it is mitigated. As a result, even if an object collides with the side wall surface 2b on which the first overflow channel 8a is provided on the back side, the risk of damage to the bowl surface 2 can be reduced. On the other hand, the second overflow channel 8b extends from the back side of the side wall surface 2e, which is a proximity side wall surface, downwards to the drain 6, so the distance is shorter. Therefore, even if an object is dropped from above the bowl surface 2, the probability of the object colliding with the bowl surface 2 located above the second overflow channel 8b is low, and the risk of damage to the bowl surface 2 can be reduced.

[0049] Furthermore, according to the washbasin 1 of this embodiment, since the floor surface 16 of the first overflow channel 8a is located below the connection portion 14 where the side wall surface 2b, which is a non-proximal side wall surface, and the bottom surface 2a of the bowl surface 2 are connected, the height from the floor surface 16 of the first overflow channel 8a to the overflow hole 4 can be increased, and the cross-sectional area of ​​the flow path of the first overflow channel 8a can be increased.

[0050] Furthermore, according to the washbasin 1 of this embodiment, since the first overflow channel 8a is provided outside the outer circumference of the bottom surface 2a of the bowl surface 2, the first overflow channel 8a is not provided below the bottom surface 2a of the bowl surface 2, and the risk of damage to the bowl surface 2 can be further reduced.

[0051] Furthermore, in the washbasin 1 of this embodiment, since the space within the rim portion 12 (cavity 12a) and the space within the first overflow water channel 8a are separated, a large, interconnected space is not provided on the back side of the side wall surface 2b, and the strength of the bowl surface 2 can be increased.

[0052] Furthermore, in the washbasin 1 of this embodiment, a channel narrowing section 18 with a narrowed channel cross-sectional area is provided in the middle of the overflow channel 8, which extends from the overflow hole 4 to below the drain 6, thereby suppressing the backflow of foam that has passed through the overflow channel 8.

[0053] Furthermore, in the washbasin 1 of this embodiment, the floor surface 16 of the overflow water channel 8 is sloped to become continuously lower from the upstream side to the downstream side. This prevents water flowing in from the overflow hole 4 from accumulating in the overflow water channel 8, allowing the incoming water to be quickly discharged. As a result, the inside of the overflow water channel 8 can be kept clean.

[0054] Furthermore, in the washbasin 1 of this embodiment, since the legs 20a are provided below the overflow channel 8 such that the floor surface 16 of the overflow channel 8 continuously slopes downward from the upstream side to the downstream side, even if the floor surface 16 of the overflow channel 8 is sloped, the height of the lower end of the legs 20a can be kept constant by changing the length of the legs 20a to compensate for this. As a result, washbasins in the process of being manufactured can be stably placed on the stand, and manufacturing efficiency can be improved.

[0055] The washbasin according to the embodiment of the present invention has been described above, but various modifications can be made to the above-described embodiment. In particular, in the above-described embodiment, the bottom surface of the bowl is configured to be substantially rectangular, and the side wall surface located on the side closest to the drain provided on this bottom surface and the second closest side are designated as the adjacent side wall surface, and the side wall surfaces located on the other two sides are designated as the non-adjacent side wall surface. In contrast, as a modification, the bottom surface of the bowl may be oblong, elliptical, circular, etc. In this case, a line segment is drawn from the center point of the drain provided on the bottom surface to the point closest to the edge of the bottom surface, and the side wall surfaces located within a 90-degree range on both sides of the above line segment, with the center point of the drain as the center, are designated as the adjacent side wall surface, and the remaining side wall surfaces are designated as the non-adjacent side wall surface. [Explanation of symbols]

[0056] 1 washbasin 2 Bowl surface 2a Bottom 2b Side wall surface (non-proximal side wall surface) 2c Side wall surface (non-proximal side wall surface) 2d side wall surface (proximity side wall surface) 2e Side wall surface (proximity side wall surface) 4 Overflow holes 6 Drain port 8. Overflow channel 8a First overflow channel 8b Second overflow channel 8c Third Overflow Channel 10 Counter boards 10a opening 12 Rim section 12a cavity 14 Connection part 16 Floor surface 18 Flow channel narrowing section 20 Base 20a Legs 20b groove 22 Base 22a Legs 22b Groove

Claims

1. A washbasin equipped with an overflow hole, A bowl surface having a bottom surface with a drain opening, and a side wall surface around this bottom surface with an overflow hole formed therein, An overflow channel is provided on the back side of the bowl surface, connecting the overflow hole and the area below the drain outlet, It has, The above-mentioned side wall surface consists of a proximity side wall surface located close to the drain opening and a non-proximity side wall surface not located close to the drain opening. The overflow hole is provided on the non-proximal side wall surface of the side wall surface, The washbasin is characterized by comprising: a first overflow channel provided on the back side of the non-proximal side wall surface where the overflow hole is provided; and a second overflow channel communicating with the first overflow channel and extending downward from the back side of the proximal side wall surface to the drain outlet.

2. The washbasin according to claim 1, wherein the floor surface of the first overflow channel is located below the connection point where the non-proximal side wall surface, which is provided with the overflow hole, and the bottom surface of the bowl surface connect.

3. The washbasin according to claim 1, wherein the above-mentioned first overflow channel is provided outside the outer circumference of the bottom surface of the bowl surface.

4. The washbasin according to claim 1, wherein a hollow rim portion is provided at the upper end of the side wall surface, and the space within this rim portion and the space within the first overflow channel are separated.

5. The washbasin according to claim 1, wherein the overflow channel has a channel narrowing section in the middle of the flow path from the overflow hole to below the drain outlet, where the cross-sectional area of ​​the flow path is narrowed.

6. The washbasin according to claim 1, wherein the overflow channel has a floor surface that slopes continuously downward from the upstream side to the downstream side.

7. The washbasin according to claim 6, wherein legs are provided below the overflow channel such that the floor surface of the overflow channel becomes continuously lower from the upstream side to the downstream side.

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