JP7467079B2 - Washbasin and vanity unit equipped with a discharge part - Google Patents

Description

This disclosure relates to washbasins and vanity units.

Patent Document 1 discloses a washbasin with a washbowl section. In this washbasin, the periphery of the washbowl section is formed so that it rises steeply on all four sides. A drain is formed in the bottom of the washbowl section, and the periphery is formed so that there is a downward slope from the periphery to the drain.

JP 2018-89263 A

In washbasins where the rim of the washbowl rises steeply on all four sides and the drain is sloped downwards from the rim, the water may spread out and flow over the top surface of the base, leaving room for improvement in terms of improving the drainage flow.

The problem to be solved by this disclosure is to provide a washbasin that can improve the flow of drainage.

The washbasin according to the first aspect of the present disclosure comprises a bowl portion in which a drain is formed, the bowl portion has a water discharge drop position disposed on the inner surface in front of the water discharge drop position, the inner surface has a curved portion that curves backwards to the left and right in a horizontal cross-sectional shape cut by a horizontal plane passing through the water discharge drop position, and the curved portion has a larger radius of curvature on the left and right than on the front end.

The washbasin according to the second aspect of the present disclosure includes a bowl portion in which a drain is formed, and the bowl portion has a water discharge drop position disposed on the inner surface in front of the water discharge hole, and the inner surface is configured such that the water discharged after colliding with the inner surface is concentrated forward of the water discharge drop position, forming a thin bundle of water discharged on both sides in the left-right direction compared to the center.

FIG. 1 is a perspective view showing a schematic configuration of a washbasin according to a first embodiment. FIG. 2 is a front view showing a schematic view of a washbasin. FIG. 2 is a plan view showing a schematic diagram of a washbasin. 4 is a cross-sectional view taken along line IV-IV of FIG. 3. 4 is a cross-sectional view taken along line VV in FIG. 3. 6 is a cross-sectional view taken along line VI-VI of FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 3. FIG. 8 is a partially enlarged view of FIG. 7 . IX-IX line cross-sectional view of FIG. 3. 8 is a cross-sectional view taken along line XX in FIG. 7. 10 is a cross-sectional view taken along line XI-XI of FIG. 8 is a cross-sectional view taken along line XII-XII in FIG. 7. 8 is a cross-sectional view taken along line XIII-XIII in FIG. 7. This is an oblique view to explain how hot and cold water flows after colliding with the inner surface of the bowl portion. 13 is a cross-sectional view illustrating how hot and cold water flows after colliding with the inner surface of the bowl portion. FIG. 10 is a diagram for explaining the flow of hot water drained into the drain outlet. FIG. A cross-sectional view of a washbasin according to embodiment 2.

<Embodiment 1>
As shown in FIG. 1, the washbasin 1 is an attachment washbasin provided in the vanity 100. The vanity 100 is configured to include the washbasin 1, the washstand 101, the back panel 102, the mirror cabinet 103, and the faucet unit 104. The vanity 100 has the back panel 102 disposed above the washstand 101, and the mirror cabinet 103 disposed above the back panel 102. The vanity 100 is installed by placing the washstand 101 on the floor surface, and fixing the washstand 101, the back panel 102, and the mirror cabinet 103 to the wall surface using fixing members such as nails and screws. The mirror cabinet 103 is an example of an upper cabinet. In the following description, the front and rear directions are described with the direction toward the wall surface side of the vanity 100 in the installed state as the rear, and the opposite direction as the front. Regarding the left and right directions, the left and right directions when the bathroom vanity unit 100 is viewed from the front will be referred to as left and right directions.

The washbasin 101 is formed into a box shape overall. A plate-shaped counter 101A is fixed to the top of the washbasin 101. The counter 101A is an example of a support member. The washbasin 1 is placed on this counter 101A. The mirror cabinet 103 has a mirror door 103A that can be opened and closed freely. A storage space is formed behind the mirror door 103A. The faucet unit 104 is located above the washbasin 1 and at the bottom of the mirror cabinet 103.

The faucet unit 104 is mostly housed inside the mirror cabinet 103. The faucet unit 104 has a discharge part 104A that discharges hot and cold water, a water discharge operation part 104B that controls the water discharge from the discharge part 104A, and a drain operation part 104C that opens and closes the drain plug 105 attached to the washbasin 1. The discharge part 104A, the water discharge operation part 104B, and the drain operation part 104C are each provided to protrude downward from the lower end of the mirror cabinet 103.

As shown in FIG. 2, the washbasin 1 is installed with its peripheral portion placed on the counter 101A, which serves as a support member. Specifically, the peripheral portion of the washbasin 1 is placed on the upper surface M of the counter 101A, and the center portion penetrates a notch 101B formed in the counter 101A and is fitted into the counter 101A (see FIG. 5). The upper surface M of the counter 101A is an example of a mounting surface of a support member. The washbasin 1 is made of ceramic, with each part integrally formed by casting. The washbasin 1 has a generally rectangular shape in plan view that is slightly longer in the left-right direction as a whole. The rear end of the washbasin 1 abuts against the front surface of the back panel 102.

2 to 13, the washbasin 1 includes a bowl portion 10, a base portion 30, and an overflow portion 40. The bowl portion 10 is generally rectangular in plan view. The bowl portion 10 includes a front bowl surface portion 20, left and right bowl surface portions 12, a rear bowl surface portion 13, and a bottom bowl surface portion 14. The bowl portion 10 is integrally formed with the front bowl surface portion 20, the left and right bowl surface portions 12, and the rear bowl surface portion 13 continuously surrounding the periphery of the bottom bowl surface portion 14. The bowl portion 10 includes a drain port 15 formed at a position near the rear of the center of the bottom bowl surface portion 14 in the left-right direction. The drain port 15 is formed by penetrating the bottom bowl surface portion 14 in the vertical direction. The drain port 15 is formed at the lowest position of the bottom bowl surface portion 14. The drain port 15 is connected to an overflow flow path 42 that is connected to an overflow hole 41 of the overflow portion 40, which will be described later. The bowl section 10 has a bowl shape that becomes lower from each of the bowl surface sections 20, 12, and 13 toward the drainage outlet 15 of the bottom bowl surface section 14. The bowl section 10 has a water discharge drop position PF located in front of the drainage outlet 15 on the inner surface 10A. This water discharge drop position PF can be identified as the center of the area where the water falls when the maximum amount of water is discharged from the discharge section 104A. The water discharge drop position PF is the intersection of the drop trajectory of the water discharged from the discharge section 104A and the inner surface 10A of the bowl section 10 (see FIG. 15). In FIG. 15, the drop trajectory of the water discharged is depicted diagrammatically by a dashed line.

As shown in FIG. 3, the front bowl surface portion 20 is configured so that the distance between the edge 20A located on the front side and the drainage opening 15 increases as the distance from the drainage opening 15 increases to the left or right. As shown in FIG. 2, the edge 20A of the front bowl surface portion 20 is formed to extend approximately horizontally in the left-right direction. Compared to the other bowl surface portions 12, 13, the front bowl surface portion 20 is located at a position farthest from the position of the drainage opening 15 in a plan view. As shown in FIG. 7, the inner surface 10A of the bowl portion 10 has the gentlest overall slope from the drainage opening 15 of the bottom bowl surface portion 14 toward the front bowl surface portion 20. Compared to the other bowl surface portions 12, 13, the front bowl surface portion 20 has the lowest upper end position.

The lower edge of the front bowl surface portion 20 can be identified as the portion where the angle of inclination toward the drain outlet 15 on the inner surface 10A of the bowl portion 10 changes to an angle greater than a predetermined angle. Specifically, in the side cross section shown in FIG. 7, the lower edge of the front bowl surface portion 20 is the portion where the angle of inclination toward the drain outlet 15 changes to an angle greater than the angle of inclination of the bottom bowl surface portion 14. The front bowl surface portion 20 has a water discharge drop position PF, where hot and cold water is discharged from the discharge portion 104A, located near the lower edge.

The left and right bowl surface sections 12 are provided on the left and right of the bottom bowl surface section 14 and have an approximately symmetrical shape. The inner surface 10A of the bowl section 10 is formed as a gently curved surface that is concave diagonally downward in the left and right bowl surface sections 12. The left and right left and right bowl surface sections 12 face each other and form a bowl surface whose width increases from left to right as it goes upward. As shown in FIG. 7, each left and right bowl surface section 12 is formed so that the position of the upper end 12A is gradually curved and lowered from the rear end to the front end. The upper end 12A of the left and right bowl surface sections 12 has an upwardly bulging shape in side view. The "upwardly bulging shape" refers to a shape in which the center of the upper end 12A bulges upward from an imaginary straight line connecting the front end and the rear end of the upper end 12A. The upper ends 12A of the left and right bowl surface sections 12 are highest at the rear end and lowest at the front end. The upper ends 12A of the left and right bowl surface portions 12 are the portions that form the edges of the left and right bowl surface portions 12, with the rear ends continuing to the edge 13A of the rear bowl surface portion 13 and the front ends continuing to the edge 20A of the front bowl surface portion 20.

The rear bowl surface portion 13 is formed with an upper end that extends approximately horizontally in the left-right direction at a position higher than the upper end of the front bowl surface portion 20. As shown in FIG. 3, the rear bowl surface portion 13 is located at a position closest to the drainage outlet 15 in a plan view compared to the other bowl surface portions 20, 12. For this reason, the inner surface 10A of the bowl portion 10 has the steepest overall slope from the drainage outlet 15 of the bottom bowl surface portion 14 toward the rear bowl surface portion 13. Specifically, as shown in FIG. 7, the inner surface 10A of the bowl portion 10 at the rear bowl surface portion 13 is flat and rises diagonally upward at a slope close to vertical in most of the lower end side. The edge 13A of the rear bowl surface portion 13 is flat and extends vertically.

As shown in Figures 3 and 7, the bowl portion 10 has a convex portion 22, a mounting portion 23, and a concave portion 24. The convex portion 22 is provided on the front bowl surface portion 20. The mounting portion 23 is provided at the front end portion of the front bowl surface portion 20. The concave portion 24 is provided below the convex portion 22. The concave portion 24, the convex portion 22, and the mounting portion 23 are formed so as to be smoothly continuous in this order from below and rearward.

The convex portion 22 is formed so that the entire front bowl surface portion 20, which has a predetermined thickness, curves downward toward the drain outlet 15. The convex portion 22 is formed in the front bowl surface portion 20 in an area excluding the front end, left end, right end, and approximately the lower 1/3. As shown in Figures 7 and 11, the convex portion 22 has a convex surface 22A extending in the left-right direction. In the vertical direction, the lower edge of the convex surface 22A is located above the position of 50% water level from the drain outlet 15, assuming that the height at the lowest position of the edge of the bowl portion 10 is 100% water level, based on the height of the drain outlet 15. In this embodiment, the lowest position of the edge is the position of the center in the left-right direction of the edge 20A of the front bowl surface portion 20. The lower edge of this convex surface 22A is located below the overflow hole 41. In a configuration in which the concave surface 24A continues below the convex surface 22A, the lower edge of the convex surface 22A can be identified as an inflection point. For example, in the side cross section shown in FIG. 7, the inflection point between the convex surface 22A and the concave surface 24A is located at a position about 65% of the water level from the drain outlet 15. If the water level is defined in the same manner as described above, the top of the convex surface 22A is located above a position about 80% of the water level from the drain outlet 15. For example, in the side cross section shown in FIG. 7, the top of the convex surface 22A is located at a position about 85% of the water level from the drain outlet 15. The upper surface M of the counter 101A is located near the back side of the top of the convex surface 22A.

The convex surface 22A has a smoothly curved shape that is convex upward and backward in the front-to-back direction. The convex surface 22A is a convex curved surface whose inclination angle with respect to the horizontal plane gradually increases continuously from the upper end to the lower end. The inclination angle of the convex surface 22A will be described in detail later. As shown in FIG. 11, the convex surface 22A has a gently curved shape in the left-right direction such that the radius of curvature gradually decreases from the center to the left and right. The left-right center of this convex surface 22A is a gently curved curved surface that extends along the edge 20A of the front bowl surface portion 20. The left and right ends of the convex surface 22A are curved surfaces that are curved backward in the left-right direction. The convex surface 22A smoothly continues to its surrounding surfaces.

The placement portion 23 is configured such that the entire front bowl surface portion 20, which has a predetermined thickness, extends substantially horizontally. The placement portion 23 is formed in the front end portion, except for the left end portion and the right end portion. The placement portion 23 is the portion that is located under the arm when a hand is inserted from the front between the discharge portion 104A and the water discharge drop position PF. The placement portion 23 has a placement surface 23A that extends in the left-right direction. The placement surface 23A extends in a substantially straight line in the left-right direction, and is slightly lowered toward the rear in the front-to-rear direction. The placement surface 23A is a surface that faces upward, and is formed so that small items such as toothbrushes, towels, and other toiletries can be placed on it. The placement surface 23A includes a flat surface. The placement portion 23 corresponds to a flat portion having a flat surface.

As shown in FIG. 4, the front end of the front bowl surface portion 20 is located higher on both sides than the center in the left-right direction in a cross-sectional shape cut by a plane perpendicular to the front-rear direction. The front end of the front bowl surface portion 20 is shaped to gradually rise from the mounting portion 23 toward the left and right. Specifically, the front end of the front bowl surface portion 20 has rising portions on both the left and right sides of the mounting portion 23 that rise from the mounting surface 23A of the mounting portion 23.

As shown in FIG. 7, the recess 24 is formed such that the entire front bowl surface portion 20, which has a predetermined thickness, curves downward toward the drain outlet 15. The recess 24 has a concave surface 24A. The concave surface 24A is formed in the area below the convex portion 22 in the front bowl surface portion 20. The concave surface 24A is formed to rise gently from the upper surface of the bottom bowl surface portion 14. The bottom of the concave surface 24A is located near the front of the water discharge drop position PF.

The concave surface 24A is smoothly curved so as to be convex downward and forward in the front-to-rear direction. The concave surface 24A is a concave curved surface whose inclination angle with respect to the horizontal plane gradually decreases continuously from the upper end to the lower end. The inclination angle of the concave surface 24A will be described in detail later. As shown in Figures 12 and 13, the concave surface 24A is curved backwards in the left-right direction so as to surround the discharged water drop position PF.

In the side cross section shown in FIG. 8, the inclination angles of the placement surface 23A, the convex surface 22A, and the concave surface 24A with respect to the horizontal plane will be described. In the curve showing the inner surface 10A of the bowl portion 10, the position of the upper end of the front bowl surface portion 20 is P1, the position between the placement surface 23A and the convex surface 22A is P2, the position of the inflection point between the convex surface 22A and the concave surface 24A is P3, and the position of the lower end of the front bowl surface portion 20 is P4. The tangent to the curve showing the inner surface 10A of the bowl portion 10 is defined as T, and the inclination angle of this tangent T with respect to the horizontal plane is defined as θ. This inclination angle θ is 0° or more and 90° or less at any position. In FIG. 8, the tangent T and the inclination angle θ at each point P1 to P4 are represented by the number attached to the point P. The placement surface 23A is formed in such a form that the inclination angle θ is sufficiently small in the range from point P1 to point P2, so that even if small items are placed on top, they do not easily slide off (θ1<θ2). The inclination angle θ increases continuously and gradually from the upper side to the lower side of point P2. In other words, there is no sharp shape such as a corner at point P2, and the placement surface 23A and the convex surface 22A are smoothly connected. The convex surface 22A is formed in such a manner that the inclination angle θ increases continuously and gradually from point P2 to the inflection point P3 (θ2<θ3). The inclination angle θ decreases from the convex surface 22A side to the concave surface 24A side at the inflection point P3. The concave surface 24A is formed in such a manner that the inclination angle θ decreases continuously and gradually from the inflection point P3 to point P4 (θ3>θ4).

In the side cross section shown in FIG. 9, the region connected to the left and right of the recess 24 will be described. The lowest bottom surface shown in this side cross section is located at about 30% of the water level from the drain outlet 15. The region connected to the left and right of the recess 24 on the inner surface 10A of the bowl portion 10 is a gently curved surface that gradually rises from the above-mentioned bottom surface toward the front. The radius of curvature of the region connected to the left and right of the recess 24 is larger in the front-rear direction than the radius of curvature of the concave surface 24A. In the inner surface 10A that appears in the cross-sectional shape of the bowl portion 10 cut along the front-rear direction, the lowest position moves forward as it moves left and right. For example, if the lowest position of the inner surface 10A shown in the side cross section of FIG. 7 is identified as the center of the drain outlet 15, the lowest position of the inner surface 10A shown in the side cross section of FIG. 9 is located forward of the center of the drain outlet 15.

The horizontal cross-sectional shape cut by a horizontal plane passing through the water discharge drop position PF shown in Figure 13 will be described. The inner surface 10A of the bowl portion 10 has a curved portion 16 that curves backward toward the left and right in the horizontal cross-sectional shape cut by a horizontal plane passing through the water discharge drop position PF. This curved portion 16 has a larger radius of curvature on the left and right than the front end 16A. The front end 16A of the curved portion 16 is formed by the front bowl surface portion 20. In this embodiment, the front end 16A of the curved portion 16 forms part of the concave surface 24A of the recess 24. The portions 16B located on the left and right of the curved portion 16 are formed by the left and right bowl surface portions 12.

The curved portion 16 has its front end 16A at the water discharge drop position PF, and surrounds the drain outlet 15, extending rearward from the drain outlet 15. The front end 16A of the curved portion 16 curves and extends left and right in front of the drain outlet 15. The portions 16B located on the left and right of the curved portion 16 extend rearward while gently curving to the left and right of the drain outlet 15. The curved portion 16 is roughly U-shaped, and its rear end is connected to the rear bowl surface portion 13. This curved portion 16 forms a guide surface that guides hot water that has fallen to the water discharge drop position PF rearward.

The horizontal cross-sectional shape cut by a horizontal plane passing above the water discharge drop position PF shown in FIG. 12 will be described. The position of this horizontal plane is about 30% of the water level from the drain outlet 15 and is below the overflow hole 41. The bowl portion 10 has corner portions 17 on both the left and right sides behind the drain outlet 15. This corner portion 17 is located between the left and right bowl surface portions 12 and the rear bowl surface portion 13, with the front portion being composed of the left and right bowl surface portions 12 and the rear portion being composed of the rear bowl surface portion 13. The corner portion 17 is formed from the bottom bowl surface portion 14 to the upper end 12A of the left and right bowl surface portions 12, extending vertically. In the horizontal cross-sectional shape cut by a horizontal plane passing through the water discharge drop position PF shown in FIG. 13, the left and right corner portions 17 are close to each other and form a continuous shape. In other words, in the horizontal cross-sectional shape cut by a horizontal plane passing through the water discharge drop position PF shown in FIG. 13, the rear end of the inner surface 10A of the bowl portion 10 is curved rather than being linearly extended to the left and right.

Comparing the horizontal cross-sectional shapes shown in Figures 10 to 13, the front end of the inner surface 10A of the bowl portion 10 is formed so that the radius of curvature increases as it moves upward. The inner surface 10A of the bowl portion 10 is formed so that at low water levels, the vertical dimension is larger than the horizontal dimension at the water surface (see Figure 13), and as the water level rises, the ratio of the vertical dimension to the horizontal dimension at the water surface increases, and the vertical dimension is smaller than the horizontal dimension at the lower end position of the overflow hole 41 (see Figure 11). This vertical dimension is the width from the front to the back of the center position of the drain outlet 15 in Figures 10 to 13, and the horizontal dimension is the width from the left to the right of the center position of the drain outlet 15 in Figures 10 to 13.

The inner surface 10A of the bowl portion 10 is formed so that its width in the left and right directions narrows toward the corner portion 17. In other words, the left and right bowl surface portions 12 are formed with curved surfaces that curve inward in the left-right direction toward the rear bowl surface portion 13. The portion formed so that its width narrows in the left and right directions toward the corner portion 17 constitutes a guide surface that guides hot water toward the corner portion 17 while gradually changing the direction of the hot water flow inward in the left-right direction. The portion formed so that its width narrows in the left and right directions toward the corner portion 17 can act to reduce the impact of hot water colliding with the rear portion of the corner portion 17.

The corner portion 17 has a smaller radius of curvature than the left and right radii of curvature of the curved portion 16. The front portion of the corner portion 17 extends rearward, and the rear portion is bent inward in the left-right direction from the rear end of this front portion. The rear portion of this corner portion 17 forms a wall surface against which hot and cold water flowing rearward along the front portion of the corner portion 17 collides. In other words, the corner portion 17 forms a second guide surface that changes the flow direction of hot and cold water flowing rearward along the left and right bowl surface portions 12 to a direction toward the inside in the left-right direction.

The horizontal cross-sectional shape cut by a horizontal plane passing through the lower end position of the overflow hole 41 shown in Figure 11 will be described. In this horizontal cross-sectional shape, the inner surface 10A of the bowl portion 10 has a front edge portion 18 whose distance from the drain outlet 15 increases as the distance from the drain outlet 15 increases to the left and right, and upward curved portions 19 that curve backward on both the left and right sides of the front edge portion 18.

The front edge 18 is formed by the front bowl surface portion 20. In this embodiment, the front edge 18 forms part of the convex surface 22A below the apex of the convex portion 22. The upper curved portion 19 is formed between the front bowl surface portion 20 and the left and right bowl surface portions 12. The radius of curvature of the upper curved portion 19 is larger than the radius of curvature of the front end of the curved portion 16. The radius of curvature of the upper curved portion 19 is larger than the radius of curvature of the corner portion 17 that appears in the same horizontal cross section. The upper curved portion 19 is located near the water surface when the washbasin 1 is full, and forms a third guide surface that guides water flowing forward toward the overflow hole 41.

As shown in Figures 2 to 6, the base 30 is connected to the lower part of the front bowl surface 20 and the left and right bowl surface parts 12, and forms the peripheral part of the washbasin 1. The base 30 is placed on the upper surface M of the counter 101A. The space between the base 30 and the counter 101A is sealed by a caulking material (not shown).

As shown in FIG. 7, the front surface 31 of the base portion 30 has an overhanging shape in which the upper end is located further forward than the lower end. The front surface 31 of the base portion 30 includes a concave curved surface whose inclination angle with respect to the horizontal plane increases continuously and gradually from the upper end to the lower end. The front surface 31 of the base portion 30 corresponds to the front surface extending downward from the edge 20A. The radius of curvature of the curved surface on the front surface 31 is approximately constant. The radius of curvature of this curved surface is smaller than the maximum radius of curvature of the convex surface 22A of the front bowl surface portion 20. The curved surface on the front surface 31 is formed over the entire area of the front surface 31 from the left end to the right end.

The base portion 30 is connected to the front bowl surface portion 20 on the back side of the convex surface 22A of the front bowl surface portion 20. The portion 32 where the base portion 30 and the front bowl surface portion 20 connect has a concave shape that faces upward. The surface on the back side of the convex surface 22A of the front bowl surface portion 20 is a concave curved surface that extends along the convex surface 22A. The base portion 30 has a wall portion that faces upward as it faces rearward, and this wall portion connects to the front bowl surface portion 20. The portion 32 where the base portion 30 and the front bowl surface portion 20 connect is concave in a manner that moves away from the upper surface M of the counter 101A. The portion 32 where the base portion 30 and the front bowl surface portion 20 connect has a groove shape that extends along the left-right direction. When the washbasin 1 is placed on the counter 101A, the majority of the portion 32 where the base portion 30 and the front bowl surface portion 20 connect is positioned along the front edge of the notch 101B formed in the counter 101A. The portion where the base portion 30 and the left and right bowl surface portions 12 connect forms a groove extending in the front-to-rear direction. The portion where the base portion 30 and the bowl surface portions 20, 12 connect is located between the bowl surface portions 20, 12 and a wall portion that is U-shaped in plan view and is fixed to the counter 101A by a fixing member 52 (described later).

The overflow section 40 is formed in a cylindrical shape that extends in a roughly L-shape in side view from the rear of the rear bowl surface section 13 to below the bottom bowl surface section 14. The overflow section 40 has an overflow hole 41 formed at the top that opens into the bowl section 10. The overflow section 40 has an overflow flow path 42 that extends from the overflow hole 41 to the drain outlet 15. The lower edge of the overflow hole 41 is located at a water level of 60% to 80% from the drain outlet 15 in the vertical direction, assuming that the height at the lowest point of the edge of the bowl section 10 is 100% based on the height of the drain outlet 15.

As shown in FIG. 10, the washbasin 1 has a pair of fixing parts 50. Each fixing part 50 is provided to the left and right of the drain outlet 15 in a bottom view, at the position of the left and right base parts 30. A hole 51A is formed in each fixing part 50. The hole 51A is formed in a wall part that is U-shaped in a plan view and extends along the edges 20A, 12A of the washbasin 1. The washbasin 1 is fixed to the counter 101A by inserting fixing members 52 into these holes 51A.

Next, the flow of hot and cold water discharged from the discharge portion 104A into the washbasin 1 having such a configuration will be explained with reference to Figures 14 to 16.

When the water discharge operating section 104B provided on the faucet unit 104 of this washstand 100 is operated, hot and cold water is discharged from the discharge section 104A.

The hot water discharged from the discharge portion 104A falls toward the discharge water drop position PF. The hot water toward this discharge water drop position PF falls forward at a large angle, for example, an angle greater than 45°, with respect to the horizontal plane. The concave surface 24A of the recess 24 is located in front of the discharge water drop position PF, rising upward. The convex surface 22A of the convex portion 22 is located above this concave portion 24. The hot water that collides with the inner surface 10A of the bowl portion 10 at the discharge water drop position PF and its vicinity moves forward and upward along the concave surface 24A of the recess 24, and then forms a flow toward the discharge water drop position PF due to gravity. At this time, the hot water discharged later continues to fall near the discharge water drop position PF, and these hot waters join together to concentrate in front of the discharge water drop position PF. The hot water that gathers in front of the discharged water drop position PF is split into left and right along the concave surface 24A of the recess 24, and flows backward on the left and right sides of the discharged water drop position PF. In this way, a bundle of hot water is formed in front of the discharged water drop position PF, which is thinner on both the left and right sides than in the center in the left-right direction.

A part of the hot water that flows backward on the left and right sides of the water discharge drop position PF as a bundle of hot water flows down along the upper surface of the bottom bowl surface portion 14 and reaches the drain outlet 15 from both the front and the left and right sides. Another part of the hot water that flows backward on the left and right sides of the water discharge drop position PF as a bundle of hot water reaches the corner portion 17 between the left and right bowl surface portions 12 and the rear bowl surface portion 13. The hot water that reaches the corner portion 17 between the left and right bowl surface portions 12 and the rear bowl surface portion 13 changes its flow direction to a direction toward the inside in the left and right direction along the corner portion 17. The washing water that passes through the corner portion 17 flows toward the inside in the left and right direction, flowing down along the upper surface of the bottom bowl surface portion 14 and reaching the drain outlet 15 from the rear. These flows toward the drain outlet 15 flow into the drain outlet 15 without passing the upper surface of the drain plug 105, and are drained from the drain outlet 15. In other words, in the washbasin 1 of this embodiment, a water film of hot water toward the drain outlet 15 is formed below the drain plug 105. Compared to a configuration in which hot and cold water discharged from the drain plug 105 falls onto the top surface of the drain plug 105 or near the drain plug 105, this washbasin 1 is less likely to create a water film between the drain plug 105 and the drain outlet 15, allowing for smooth drainage.

Next, we will explain how the washbasin 1 having such a configuration looks when filled with water and used, with reference to Figures 7 and 11.

When the drain outlet 15 of this washbasin vanity unit 100 is closed with the drain plug 105 (not shown in FIG. 7) and water is poured into the washbasin 1, the washbasin becomes full at the lower end position of the overflow hole 41. In FIG. 7, the water level when full is indicated by a dashed line. The shape of the water surface when full becomes the shape of the area surrounded by the bowl portion 10 in FIG. 11. In front of and above the water surface, the convex surface 22A of the convex portion 22 and the mounting surface 23A of the mounting portion 23 are arranged in this order. The upper end of the front bowl surface portion 20 is lower than the other bowl surface portions 12, 13, making it easier to reach inside the bowl portion 10.

When washing hands or clothes, etc., putting hands into the water and moving them creates a water flow, and some of the water may flow forward. The water flowing forward is restricted from flowing further forward by the convex surface 22A of the front bowl surface portion 20, and flows left and right along the front edge portion 18 in FIG. 11. The water flowing left and right along the front edge portion 18 forms a flow toward the rear along the upper curved portion 19, flows toward the overflow hole 41, and is drained from the overflow hole 41. In this way, even if the water stored in the washbasin 1 flows forward, the water is prevented from splashing forward. In a configuration in which the upper curved portion 19 is not formed and corners are formed between the front bowl surface portion 20 and the left and right bowl surface portions 12, there is a risk that foam of water, detergent, etc. will remain in the corner located farthest from the overflow hole 41. In this embodiment, such corners are not formed, and an upward curved portion 19 is formed between the front bowl surface portion 20 and the left and right bowl surface portions 12, so water and bubbles can be smoothly directed from the front edge portion 18 to the overflow hole 41. In a configuration in which corners are formed between the front bowl surface portion 20 and the left and right bowl surface portions 12, there is a concern that the flow of water from the center in the left and right direction and the flow of water from the rear will concentrate locally at the corners, causing water to splash out to the outside. In this embodiment, such corners are not formed, and an upward curved portion 19 is formed between the front bowl surface portion 20 and the left and right bowl surface portions 12, so water can be prevented from splashing out to the outside due to localized concentration of water.

Next, we will explain what happens when splashes occur in the washbasin 1. As shown in Figures 7 and 11, the area of the front bowl surface portion 20 that extends outward above the water surface is larger than the left and right bowl surface portions 12 and the rear bowl surface portion 13. When splashes fly forward, the convex surface 22A and the mounting surface 23A of the front bowl surface portion 20 receive the splashes and allow them to flow down into the bowl portion 10. The height of the upper ends 12A of the left and right bowl surface portions 12 is higher than the front end, especially in the central portion where splashes are likely to fly. When splashes fly to the left or right, the left and right bowl surface portions 12 restrict the splashes from going beyond the upper ends 12A and heading toward the outside. In this way, the washbasin 1 prevents splashes from flying outward.

The effects of the washbasin 1 configured as above will now be explained.

The washbasin 1 has a bowl section 10 in which a drain outlet 15 is formed. The bowl section 10 has a water discharge drop position PF located on the inner surface 10A in front of the drain outlet 15. The inner surface 10A of the bowl section 10 has a curved section 16 that curves backwards to the left and right in a horizontal cross section cut by a horizontal plane passing through the water discharge drop position PF. The curved section 16 has a larger radius of curvature on the left and right sides than the front end 16A. With this washbasin 1, water that falls at the water discharge drop position PF easily flows along the curved section 16 toward the drain outlet 15, improving the flow of water.

The washbasin 1 has a bowl section 10 in which a drain outlet 15 is formed. The bowl section 10 has a water discharge drop position PF located on the inner surface 10A in front of the water discharge outlet 15. The inner surface 10A of the bowl section 10 is configured so that hot and cold water concentrates after colliding with the inner surface 10A forward of the water discharge drop position PF, forming a stream of hot and cold water that is thinner on the left and right sides than in the left-right center. This washbasin 1 can improve the flow of drainage because a stream of hot and cold water is formed on the left and right sides in the left-right direction after colliding with the inner surface 10A of the bowl section 10 and is thinner on the left and right sides than in the left-right center.

The bowl portion 10 has corner portions 17 on both the left and right sides behind the drain outlet 15. The inner surface 10A of the bowl portion 10 is formed so that the width from left to right narrows toward the corner portions 17. The corner portions 17 are formed so that the radius of curvature is smaller than the radius of curvature on the left and right sides of the curved portion 16. This washbasin 1 allows wastewater to flow along the corner portions 17 to the drain outlet 15.

The bowl portion 10 is formed with an overflow hole 41. In a horizontal cross-sectional shape of the inner surface 10A of the bowl portion 10 cut along a horizontal plane passing through the lower end position of the overflow hole 41, the inner surface 10A has a front edge portion 18 whose distance from the drain outlet 15 increases as the distance from the drain outlet 15 increases to the left or right, and an upward curved portion 19 that curves backward on both the left and right sides of the front edge portion 18. When water is stored in the washbasin 1, the water near the water surface can flow along the upward curved portion 19 to the overflow hole 41, and water can be prevented from accumulating on both sides of the front edge portion 18.

The radius of curvature of the upper curved portion is greater than the radius of curvature of the front end of the curved portion. When water is stored in the washbasin 1, the water near the water surface can flow along the upper curved portion 19 to the overflow hole 41, and water retention on both sides of the front edge portion 18 can be effectively prevented.

The washbasin vanity 100 comprises a washbasin 1, a mirror cabinet 103 located above the washbasin 1, and a discharge part 104A attached to the underside of the mirror cabinet 103, which discharges hot and cold water toward the water discharge drop position PF. This washbasin vanity 100 can discharge hot and cold water toward the water discharge drop position PF forward while ensuring a sufficient discharge angle with respect to the horizontal direction. This makes it difficult for the water that falls to the water discharge drop position PF to flow forward, making it easier for a drainage flow to form along the curved part 16 toward the drain outlet 15.

<Embodiment 2>
As shown in Fig. 17, the washbasin 201 according to the second embodiment differs from the first embodiment in the configuration of the overflow portion. The same components as those in the first embodiment are denoted by the same reference numerals, and duplicated explanations will be omitted.

The overflow section 240 is formed in a cylindrical shape that extends in an arc shape in side view from the front of the front bowl surface section 20 to below the bottom bowl surface section 14. The overflow section 240 has an overflow hole 241 formed at the top that opens into the bowl section 10. The overflow section 240 has an overflow flow path 242 that extends from the overflow hole 241 to the drain outlet 15. The lower edge of the overflow hole 241 is located at a water level of 60% to 80% from the drain outlet 15 in the vertical direction of the bowl section 10, when the position of the upper end of the front bowl surface section 20 is taken as the water level of 100% based on the position of the drain outlet 15.

The front bowl surface portion 20 has an overflow hole 241 formed below the apex of the convex surface 22A. The overflow hole 241 is located above the concave surface 24A. This overflow hole 241 is located between the apex of the convex surface 22A and the inflection point between the convex surface 22A and the concave surface 24A.

This washbasin 201 has an overflow hole 241 formed below the top of the convex surface 22A, so water flowing forward can escape through the overflow hole 241, making it difficult for splashes to fly over the convex portion 22 and in front of the front bowl surface.

The present disclosure is not limited to the disclosure of embodiments 1 and 2 described above in the description and drawings, but also includes, for example, the following embodiments:

(1) The shape of the curved portion is not particularly limited. The radius of curvature at the front end may be constant or may not be constant. Similarly, the radius of curvature on the left and right sides of the curved portion may be constant or may not be constant. The shape of the curved portion is not particularly limited. The radius of curvature at the front end may be constant or may not be constant. Similarly, the radius of curvature on the left and right sides of the curved portion may be constant or may not be constant. The curved portion may include a portion that is not so-called tangentially continuous.

(2) The shape of the inner surface of the bowl portion is not particularly limited. The inner surface of the bowl portion does not have to have a curved portion or a concave portion, for example, because hot water that collides with the inner surface is concentrated forward of the water discharge falling position, forming a bundle of hot water that is thinner on both sides in the left-right direction than in the center. Examples of the shape of the inner surface of such a bowl portion include a slope shape with a predetermined gradient angle and a vertical wall surface that has a predetermined angle with respect to the direction in which the water discharge falls. The bowl portion does not have to have a convex portion or a placement surface.

(3) The position, shape, and configuration of the corner portion may be changed as appropriate. The corner portion may be formed so that the radius of curvature is smaller than the radius of curvature on the left and right sides of the curved portion.

(4) The location where the discharge unit is attached is not particularly limited. The discharge unit may be attached to a mounting surface provided on the washbasin.

(5) The horizontal cross-sectional shape cut along a horizontal plane passing through the lower end position of the overflow port is not particularly limited. For example, both the front end and the front edge may have the same radius of curvature.

(6) Although a mirror cabinet is given as an example of the upper cabinet, the vanity unit may also have a cabinet without a mirror as the upper cabinet.

1,201...washbasin, 10...bowl, 10A...inner surface, 15...drain, 16...curved portion, 16A...front end, 17...corner portion, 18...front edge, 19...upper curved portion, 41,241...overflow port, 100...vanity vanity, 101A...counter, 103...mirror cabinet (upper cabinet), 104A...discharge portion, PF...water discharge drop position

Claims (6)

A washbasin having a bowl portion in which a drain hole is formed,
A discharge portion is provided at the rear upper portion of the washbasin,
The discharge portion is configured to discharge water diagonally downward toward the front of the drain outlet,
The inner surface of the bowl portion has a curved portion that curves backward toward the left and right in a horizontal cross-sectional shape cut by a horizontal plane passing through a water drop position, which is the center of the area where the water falls when the maximum amount of water is discharged from the discharge portion,
A washbasin provided with a discharge portion, the curved portion having a larger radius of curvature on the left and right sides than on the front end. A washbasin with a discharge section according to claim 1, in which the inner surface is configured so that hot and cold water is concentrated after colliding with the inner surface forward of the water discharge drop position, forming a bundle of hot and cold water that is thinner on both sides than in the center in the left-right direction. The bowl portion has corner portions on both left and right sides behind the drain outlet,
The inner surface is formed so that the width in the left and right direction decreases toward the corner portion,
A washbasin provided with a discharge portion according to claim 1 or claim 2 , wherein the radius of curvature of the corner portion is smaller than the radius of curvature of the left and right sides of the curved portion. The bowl portion has an overflow port formed therein,
A washbasin provided with a discharge portion described in any one of claims 1 to 3, wherein the inner surface has, in a horizontal cross-sectional shape cut by a horizontal plane passing through the lower end position of the overflow outlet, a front edge portion whose distance from the drain outlet increases as the distance from the drain outlet increases to the left or right, and an upward curved portion that curves backward on both the left and right sides of the front edge portion. The washbasin provided with a discharge portion according to claim 4 , wherein the radius of curvature of the upper curved portion is greater than the radius of curvature of a front end of the curved portion. A washbasin provided with the discharge portion according to any one of claims 1 to 5 ;
An upper cabinet located above the washbasin,
The discharge portion is attached to the underside of the upper cabinet and discharges hot and cold water toward the water discharge drop position.

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