TWI654355B - Kitchen sink - Google Patents

Abstract

The purpose is to provide a kitchen sink, which does not easily cause vegetable wastes to accumulate on the bottom surface of the sink, which can improve the user's comfort and cleaning performance.

The configuration of the kitchen sink (sink (100)) of the present invention includes a bottom surface (110) inclined downward in the front-rear direction toward the front side, and is disposed in contact with one of the left and right ends of the sink The drain (120) deeper than the front end (102b) of the sink, and the induction ditch (130) that continues from the front end of the sink to the drain along the side end (left end (102a)) of the sink, the sink The front end of is inclined downward as it faces the side where the drain is provided.

Description

Kitchen sink

The present invention relates to a kitchen sink incorporated in a kitchen cabinet such as a system kitchen.

In the conventional kitchen, the sink is integrated into the kitchen cabinet, and in this sink, the ingredients are adjusted and the utensils are washed. For example, in the kitchen sink disclosed in Patent Document 1, the bottom surface of the sink is inclined so as to lower the drain side. Thereby, since the water at the time of washing flows toward the drain outlet from the bottom surface of the water tank, it is possible to achieve an improvement in water drainage and further improve workability.

[Xizhi technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 11-13101

In the conventional kitchen sink, as mentioned in the above patent literature 1. The bottom surface is generally inclined toward the drain, and the bottom surface of the sink has a mortar-shaped tilt around the drain. Here, when conditioning food and washing utensils in the water tank, leftovers attached to the utensils and vegetable waste of the ingredients during conditioning (hereinafter referred to as vegetable waste, etc.) may occur.

At this time, if it is known that the bottom surface is a sink that is inclined toward the drain, vegetable wastes, etc. that are closer to the drain than the discharge position from the faucet are those that flow toward the drain by the water flow at the time of washing. Vegetable wastes located on the opposite side of the drain will stay there. Furthermore, in the conventional water tank, the drain port is arranged on the rear side of the water tank. However, by conditioning, vegetable waste etc. accumulate on the front side of the sink. Therefore, the retention of vegetable wastes occurs every time. Therefore, the user has to collect the accumulated vegetable wastes and the like by the hand and flow toward the drainage port, which has a problem of complicated labor and time. Moreover, if vegetable wastes and the like are likely to stay, dirt is easy to adhere, so cleaning requires labor and time, and there is a problem that the cleaning performance is reduced.

In view of such a problem, the present invention aims to provide a kitchen sink, which is less likely to cause stagnation of vegetable wastes and the like on the bottom surface of the sink, and can improve the user's comfort and cleaning performance.

In order to solve the above-mentioned problems, a representative example of the kitchen sink of the present invention is configured to include a bottom surface inclined downward in the front-rear direction toward the front side, and is disposed in contact with one of the left and right ends of the sink Drain outlet deeper than the front end of the sink, and along The side end of the water tank continues from the front end of the water tank to the induction groove until the drain. The front end of the water tank slopes downward as it faces the side where the drain is provided.

According to the above configuration, the bottom surface of the water tank is not a drain, but an inclined surface inclined downward toward the front side of the water tank. As a result, the side of the spouting position from the faucet is located on the inclined upstream side of the bottom surface more than the area on the front side of the water tank where vegetable waste or the like occurs. Therefore, vegetable waste and the like flow toward the front end of the water tank by the water flowing on the bottom surface of the water tank.

And the vegetable wastes and the like that reach the front end of the sink are flowed toward the induction ditch by inclining downward toward the side where the drain is provided, and flow toward the drain through the induction ditch. Therefore, for example, the vegetable waste and the like are naturally flowed by the water flow for washing the dishes, and the cleaning of the vegetable waste and the like is also completed when the dish washing is completed. Therefore, it is unnecessary for the user to perform the scraping operation of vegetable wastes as is conventional, and complicated labor and time are saved, and high comfort can be obtained. Moreover, by preventing the retention of vegetable wastes and the like, the adhesion of dirt to the bottom surface of the water tank is prevented, and the clean state can be kept from time to time. Therefore, the cleaning of the water tank can be easily performed, and high cleaning performance can be obtained.

The above bottom surface may be a flat surface, a curved surface, or a combination of these. Any of these shapes can obtain the above-mentioned effects.

The above-mentioned bottom surface may be a flat surface in the left-right direction, and the area on the side opposite to the drain port may be a mortar-shaped curved surface. As a result, it is possible to flow water wider than the area on the side of the drain In the field on the opposite side, water can be collected more efficiently toward the front side of the water tank and further vegetable wastes.

The bottom surface may be tilted obliquely toward the side where the drain is provided in the left-right direction facing the front side of the water tank in the front-rear direction. According to this structure, the vegetable waste etc. on the bottom surface can be guided to the front end of the sink optimally.

At the front end of the above-mentioned water tank, an inclined area composed of a groove shape, a flat surface, or a combination of these may be formed. This makes it possible to optimally flow vegetable wastes and the like guided toward the front end of the water tank toward the induction ditch.

According to the present invention, it is possible to provide a kitchen sink, which is less likely to cause stagnation of vegetable wastes and the like on the bottom surface of the sink, which can improve the user's comfort and cleaning performance.

100‧‧‧Sink

102‧‧‧ Vegetable waste

102a‧‧‧The left end of the sink

102b‧‧‧The front end of the sink

102c‧‧‧Right end of sink

110‧‧‧ underside

120‧‧‧Drain

130‧‧‧Induction groove

130a‧‧‧Open

132‧‧‧Tilt field

140‧‧‧wall

150‧‧‧Expansion

152‧‧‧Mounting hole

160‧‧‧Drain cover

200‧‧‧Sink

210‧‧‧Bottom

212‧‧‧ Field 1

214‧‧‧ 2nd field

232‧‧‧Tilt field

232b‧‧‧Open

300‧‧‧Sink

332‧‧‧Tilt field

332a‧‧‧groove

332b‧‧‧flat

332c‧‧‧Boundary

400‧‧‧Sink

410‧‧‧Bottom

500‧‧‧Sink

510‧‧‧Bottom

600‧‧‧Sink

610‧‧‧Bottom

612‧‧‧ Field 1

614‧‧‧ 2nd field

616‧‧‧ Junction

632‧‧‧flat surface

632a‧‧‧Boundary

[Figure 1] An overall view of the kitchen sink of the first embodiment.

[Figure 2] A cross-sectional view of Figure 1 (b).

[Figure 3] An overall view of the kitchen sink of the second embodiment.

[Figure 4] Sectional view of Figure 3.

[Figure 5] An overall view of a kitchen sink according to a third embodiment.

[Figure 6] A cross-sectional view of Figure 5.

[Figure 7] An overall view of a kitchen sink according to a fourth embodiment.

[Figure 8] Sectional view of Figure 7.

[Figure 9] An overall view of a kitchen sink according to a fifth embodiment.

[Figure 10] An overall view of a kitchen sink according to a sixth embodiment.

[Fig. 11] A-A sectional view of Fig. 10.

[Figure 12] A diagram illustrating another shape of a drain port.

The best embodiment of the hot water supply device and hot water supply system of the present invention will be described in detail below with reference to the additional drawings. The dimensions, materials, other specific numerical values, etc. shown in such embodiments are merely examples for ease of understanding of the invention, and unless otherwise specified, do not limit the inventor. In addition, in this specification and the drawings, elements having substantially the same function and configuration are omitted by repeating the same symbols, and elements not directly related to the present invention are omitted from illustration.

(First embodiment)

Fig. 1 is an overall view of the kitchen sink (hereinafter, simply referred to as sink 100) of the first embodiment, Fig. 1 (a) is an overall perspective view of the sink 100, and Fig. 1 (b) is a display showing The state of the water tank 100 in FIG. 1 (a) viewed from above. Figure 2 is a cross-sectional view of Figure 1 (b), Figure 2 (a) is an AA cross-sectional view of Figure 1 (b), Figure 2 (b) is BB of Figure 1 (b) The cross-sectional view, FIG. 2 (c), is a CC cross-sectional view of FIG. 1 (b).

As shown in (a) and (b) of FIG. 1, the water tank 100 of the first embodiment includes a bottom surface 110, a drain 120, and an induction groove 130. As shown in FIG. 2 (a), the bottom surface 110 is inclined downward toward the front side in the front-rear direction, and as shown in FIG. 1 (a), a wall surface 140 is erected from the peripheral edge. Moreover, in this embodiment, the mounting hole 152 for standing up the faucet (not shown) is arranged on the upper bulge 150 at the left corner of the rear side of the water tank 100, which is the wall surface from the rear side of the water tank 100 140 protrudes forward.

In this embodiment, as shown in (a) and (b) of FIG. 1, the drain port 120 is disposed at a position deeper than the front end 102 b of the water tank in contact with the left end 102 a of the water tank. Furthermore, in this embodiment, the configuration in which the drain port 120 is arranged in contact with the left end 102a of the water tank is exemplified, but it is not limited to this, and the drain port 120 is a position deeper than the front end 102b of the water tank, and One of the left and right ends (side edges) of the water tank 100, that is, one of the left end 102a or the right end 102c may be in contact.

As in the present embodiment, by arranging the drain 120 from a position deeper than the front end 102b of the water tank along one of the left and right ends of the water tank 100 (the left end 102a or the right end 102c), as in other fields Compared with the case where the drain 120 is arranged, the dead space can be reduced. Therefore, the bottom surface 110 of the water tank 100 can be used more efficiently. And the drain 120 is covered by the drain cover 160 arranged above. Thereby, since the drain 120 does not come into contact with the eyes of the user, the aesthetic appearance of the water tank 100 can be improved.

As shown in (a) and (b) of FIG. 1, the induction trench 130 extends from the front end 102b along the side end of the water tank, that is, the left end 102a, and continues to the drain 120. As shown in FIG. 2 (c), the induction groove 130 is a groove recessed downward from the bottom surface 110, and is inclined downward toward the side where the drain 120 is provided in the front-rear direction, that is, the rear side. As shown in FIG. 2 (b), an inclined area 132 is formed along the front end 102b of the water tank. In this embodiment, the inclined area 132 has a groove shape, and is inclined downward in the left-right direction toward the side where the drain 120 is provided, that is, the left side of the water tank 100. The inclined area 132 is connected to the induction groove 130 at the corner of the water tank 100. That is, the water dropped on the bottom surface 110 of the water tank first flows toward the front side and flows into the inclined area 132, and flows from the inclined area 132 along the induction groove 130 toward the drain 120.

As described above, in the water tank 100 of this embodiment, the bottom surface 110 is inclined downward as it goes to the front side. Moreover, since the mounting hole 152 to which the faucet is installed is provided on the rear side of the water tank 100, the spouting position from the faucet on the bottom surface 110 becomes, for example, vegetable waste on the bottom surface 110 shown in FIG. (Hereinafter referred to as vegetable waste 102) the area on the front side where the occurrence occurs is further upstream. Thereby, the water from the faucet and the vegetable waste 102 flow toward the arrow D1 direction shown in FIG. 2 (a), that is, the front end 102b of the water tank.

And the inclined area 132 along the front end 102b of the sink is inclined downward toward the side where the drain 120 is provided, so that the vegetable waste 102 reaching the front end 102b of the sink is directed toward the figure 2 (b) Arrow D2 flows away. At this time, the induction groove 130 The drain 120 is inclined downward, so that the vegetable waste 102 flowing into the induction ditch 130 reaches the drain 120 by flowing the water flowing in the direction of arrow D3 shown in FIG. Water is directed toward the drain 120.

According to the above configuration, the water flowing in the washing utensils isochronously flows through the bottom surface 110 so that the vegetable waste 102 in the area on the front side of the bottom surface 110 naturally faces the inclined area 132 along the front end 102b of the sink The induction groove 130 flows and is guided toward the drain 120. Therefore, the removal of vegetable waste 102 is also completed when the washing operation of the food utensils and the like is completed. Accordingly, the user does not need to scrape and collect the vegetable waste 102 as is conventional, and high comfort can be obtained.

And by causing the vegetable waste 102 to naturally move toward the drain 120 by the water flow during the washing operation, the retention of vegetable waste toward the bottom surface 110 of the water tank 100 is prevented. In particular, in the water tank 100 shown in FIG. 1, the bottom surface 110 is flatly inclined toward the front end 102b of the water tank. Therefore, for example, in the case of a conventional mortar-shaped inclination, a larger range of water flows and the retention of vegetable waste 102 is more suppressed. Thereby, it is possible to optimally prevent the adhesion of dirt to the bottom surface 110 of the water tank 100 due to the retention of the vegetable waste 102, and it is possible to maintain a clean state from time to time. Therefore, the user can easily clean the water tank 100, and high cleaning performance can be obtained.

Further in this embodiment, a groove-shaped inclined area 132 is formed at the front end 102b of the water tank. This makes it possible to efficiently guide the vegetable waste 102 flowing toward the front side of the water tank 100 to the induction ditch 130. In the present embodiment, although the bottom surface 110 is slanted flat toward the front side, that is, a slanted flat surface, it is not limited to this. The bottom surface 110 may be a curved surface or a combination of a flat surface and a curved surface. In addition, in the inclined region 132, although the groove shape is also exemplified in this embodiment, it is not limited to this, and a flat surface may be used, and a configuration in which the groove shape and the flat surface are combined may also be used.

(Second embodiment)

FIG. 3 is an overall view of the kitchen water tank (hereinafter, simply referred to as the water tank 200) of the second embodiment, and shows a state in which the water tank 200 is viewed from above. Fig. 4 is a cross-sectional view of Fig. 3, Fig. 4 (a) is a cross-sectional view of AA of Fig. 3, Fig. 4 (b) is a cross-sectional view of BB of Fig. 3, and Fig. 4 (c) is a Figure 3 CC section. In addition, in the following embodiments, the same components as those in the previously described embodiments are denoted by the same reference numerals, and their description will be omitted.

In the first embodiment, the entire bottom surface 110 of the water tank 100 is a flat surface. For this, in the water tank 200 of the second embodiment shown in FIG. 3, the bottom surface 210 of the water tank includes the first field 212 and the second The field 214 is constructed. In the water tank 200 of the second embodiment, the groove-shaped inclined area 232 is formed up to the midway position of the front end 102b of the water tank.

In detail, the first area 212 is the bottom surface 210, and the inclined area 232 area is not formed on the front side. The second area 214 is an area on the rear side of the inclined area 232 among the bottom surface 210. As the first As shown in FIG. 3, the first area 212, that is, the area opposite the drain 120 is inclined toward the open end 232b of the inclined area 232 in a mortar shape, and the area on the drain 120 side is the second area 214, which is The inclined area 232 is inclined flatly downward.

The first field 212 is tilted in a mortar shape. As shown in FIG. 4 (a), the first field 212 is in the front-rear direction (depth direction) of the water tank 200, as it moves toward the front end 102b of the water tank. Tilt down. On the other hand, as shown in FIG. 4 (c), in the left-right direction of the water tank 200, the first area 212 is the open end 232b (third (Figure reference) Tilt downward. As a result, the vegetable waste 102 flows through the first field 212 through the water from the faucet to the open end 232b of the inclined field 232.

As shown in FIG. 4 (b), the second area 214 is flatly inclined downward as it moves toward the inclined area 232. As a result, the vegetable waste 102 on the second field 214 flows the second field 214 toward the front side of the water tank 200 by the water from the faucet to the inclined field 232. In addition, as in the first embodiment, the vegetable waste 102 reaches the induction ditch 130 through the inclined area 232 and is guided to the drain 120.

As described above, in the second embodiment, the bottom surface 210 is constituted by the curved surface inclined in a mortar shape, that is, the first area 212, and the flat surface inclined forward, that is, the second area 214. That is, in the water tank 200 of the second embodiment, at least a part of the area is straightly inclined toward the front side of the water tank 200. With this configuration, similar to the water tank 100 of the first embodiment, the vegetable waste 102 on the bottom surface 210 can be optimally directed toward The drain 120 is induced.

Furthermore, in this embodiment, as described above, the inclined area 232 is formed not to follow all of the front end 102b of the water tank, but to the midway position of such front end 102b. This makes it possible to increase the strength of the bottom surface 210 of the water tank 200 compared to when the inclined area 232 is formed along all of the front end 102b. Therefore, it is possible to suppress the indentation, that is, the deformation of the bottom surface 210 of the water tank 200, and it is possible to obtain the aforementioned effects. Furthermore, because the entire length of the groove can be suppressed, the final rear side of the induction groove 130 can also be shallow. In this case, since extreme deep drawing is not necessary, the processing at the time of press forming of stainless steel becomes easy.

In addition, when the second area 214 is flat, it also has an effect of reducing the rear side (height difference) of the induction groove 130. Assuming that the second field 214 is inclined toward the open end 232b of the inclined field 232 in a mortar shape, the second field 214 gradually increases toward the induction groove 130 (left in FIG. 3). In this case, the difference in height between the left end 102a of the water tank and the bottom of the induction trench 130 becomes larger. However, the second field 214 is flat so that the second field 214 is not inclined in the left-right direction. Therefore, the height difference can be minimized, and processing can be performed easily.

(Third Embodiment)

FIG. 5 is an overall view of the kitchen water tank (hereinafter, simply referred to as the water tank 300) of the third embodiment, showing the state of the water tank 300 viewed from above. Fig. 6 is a cross-sectional view of Fig. 5, Fig. 6 (a) is an A-A cross-sectional view of Fig. 5, and Fig. 6 (b) is a B-B cross-sectional view of Fig. 5.

As shown in FIG. 5, the inclined area 332 of the water tank 300 of the third embodiment includes a groove-shaped groove 332 a and a flat surface 332 b. As shown in FIG. 6 (b), the groove-shaped portion 332a has a groove shape that is recessed downward from the bottom surface of the water tank 300, that is, the second area 214, and the bottom of the groove-shaped portion 332a is composed of a flat portion 332b.

In this embodiment, as shown in FIG. 5, the flat portion 332b extends beyond the open end 232b of the groove-shaped portion 332a along the front end 102b of the water tank. Although it is repeated, the groove-shaped portion 332a is ended by the open end 232b at the midway position, and only the bottom portion, that is, the flat portion 332b, has a shape extending toward the front side of the first field 212. In this way, even if the inclined area 332 is a combination of the groove shape and the flat surface, the same effect as the water tank 100 of the first embodiment described above can be obtained.

According to the above configuration, as shown in FIGS. 5 and 6 (a), in the area where the groove portion 332a is not formed on the front side of the water tank 300, the flat portion 332b and the bottom surface of the water tank 300 are the first A boundary 332c occurs between the fields 212. As a result, the front side of the first area 212 is also observed to form an induction groove. Therefore, it is possible to reduce the user's strange feeling that occurs when the groove is not formed in the first area 212.

(Fourth embodiment)

FIG. 7 is an overall view of the kitchen water tank (hereinafter, simply referred to as the water tank 400) of the fourth embodiment, showing the state of the water tank 400 viewed from above. Figure 8 is a cross-sectional view of Figure 7 and Figure 8 (a) is the seventh A-A cross-sectional view of the figure, and FIG. 8 (b) is a B-B cross-sectional view of FIG. 7.

As shown in FIG. 7, the water tank 400 of the fourth embodiment has an induction groove 130 in only the front-rear direction, and does not have a groove shape or flat surface along the front end 102b of the water tank. However, the bottom surface 410 is inclined obliquely downward toward the open end 130a of the induction groove 130 in a mortar shape. Therefore, as shown in FIG. 8 (a), the bottom surface 410 is inclined downward toward the front side in the front-rear direction (depth direction) of the water tank 400. On the other hand, as shown in FIG. 8 (b), in the left-right direction of the water tank 400, the bottom surface 410 is inclined downward toward the open end 130a position of the induction trench 130, that is, the side where the drain 120 is provided. Along with this, the front end 102b of the water tank also slopes downward toward the side where the drain 120 is provided.

According to the above configuration, the vegetable waste 102 flows the bottom surface 110 to the open end 130a of the induction trench 130 by water from a faucet (not shown), and is guided to the drain 120 through the induction trench 130. In this way, the bottom surface 410 of the water tank 400 is inclined in the front-back direction to the side where the drain 120 is provided in the left-right direction facing the front side of the water tank 400, and the water tank 100 of the first embodiment can also be obtained Effect.

(Fifth embodiment)

FIG. 9 is an overall view of the kitchen water tank (hereinafter, simply referred to as the water tank 500) of the fifth embodiment, and shows a state in which the water tank 500 is viewed from above. In the water tank 500 shown in FIG. 9, the bottom surface 510 is an angle toward the front side in the water tank 100 having the open end 130a of the induction groove 130 The part is inclined flat. In this way, the same effect as that of the water tank 100 of the first embodiment can be obtained by a structure in which a clear flow path such as a groove shape and a flat surface is not formed at the front end of the water tank.

(Sixth embodiment)

Fig. 10 is an overall view of a kitchen water tank (hereinafter, simply referred to as a water tank 600) of the sixth embodiment, and shows a state in which the water tank 600 is viewed from above. FIG. 11 is a cross-sectional view of FIG. 10, FIG. 11 (a) is a cross-sectional view of A-A of FIG. 10, and FIG. 11 (b) is a cross-sectional view of B-B of FIG.

As shown in FIG. 10, the bottom surface 610 of the water tank 600 of the sixth embodiment is configured to include the first area 612 and the second area 614. The first area 612 is the area where the bulging portion 150 is not formed on the rear side of the bottom surface 610. The second area 614 is an area where the bulge 150 is formed on the rear side of the bottom surface 610.

The first field 612 is as shown in FIG. 11 (a), which is inclined downward toward the front in the front-rear direction of the water tank 600, and in the left-right direction of the water tank 600, as shown in FIG. The boundary 616 of the field 614 is inclined downward. That is, in the water tank 600, the first area 612 is inclined like a mortar as the end toward the front side of the junction 616 is formed. On the other hand, the second area 614 is flatly inclined downward as shown in FIGS. 10 and 11 (b) toward the front end 102b of the water tank.

A further feature of this embodiment is that the water tank 600 is provided with an induction groove 130 and a flat surface along the front end 102b of the water tank. Inclined area formed by face 632. The flat surface 632 slopes downward along the front end 102b of the water tank as it faces the side where the drain 120 is provided. The flat surface 632 is not a groove shape, but a boundary line 632a is generated between the first area 612 or the second area 614. Thus, the vegetable waste 102 flowing from the bottom surface 610 by the water from the faucet reaches the inclined surface, that is, the flat surface 632, and then passes through the induction ditch 130 to the drain 120. When the full-width inclined area spanning the front end of the water tank is constituted by the flat surface 632 in this way, the same effect as the water tank 100 of the first embodiment can be obtained.

FIG. 12 is a diagram for explaining other shapes of the drain 120, and the water tank 100 shown in FIG. 1 (b) is schematically shown. In the first embodiment, as shown in FIG. 1 (b), although the substantially triangular shape (right triangle shape) of the drain port 120 is illustrated, it is not limited to this. The water outlet 120 may be a rectangular water outlet 120a as shown in FIG. 3 (a), and may be a circular water outlet 120b as shown in FIG.

In addition, in the first embodiment, the shape of the water tank 100 is a horizontally long rectangular shape, but it is only an example and is not intended to limit the user. The water tank 100 may have other shapes such as a circular shape and an L-shape. Further, in the water tank 100 of the first embodiment, although the structure including the bulging portion 150 is exemplified, this is not limitative, and the bulging portion 150 is not provided, and the faucet is disposed outside the water tank 100, that is, the mounting hole 152 for mounting the same It can also be constructed locally. It is not necessary to arrange it at the left corner of the rear side of the water tank 100 at the position where the faucet (mounting hole 152) of the bulging portion 150 is further located, and it can be arranged at any position such as the center and right corner.

The present invention has been described above with reference to the additional drawings The best embodiment, but it goes without saying that the present invention is of course not limited to such an example. It is obvious to those skilled in the art that within the scope of the patent application, various modifications or amendments are conceivable, and those of course fall within the technical scope of the present invention.

[Industrial availability]

The present invention is a kitchen sink that can be used as a kitchen cabinet incorporated into a system kitchen or the like.

Claims (3)

A kitchen sink including a bottom surface inclined downward in the front-rear direction toward the front side, and is in contact with any one of the left and right ends of the sink and is arranged at a position deeper than the front end of the sink And the induction trench that continues along the side end of the water tank from the front end of the water tank to the water drain. The front end of the water tank is inclined downward toward the side where the water drain is provided, and the bottom surface, It is a flat surface, a curved surface, or a combination of these. In the left-right direction, the area on the drain side is a flat surface, and the area on the opposite side of the drain is a mortar-shaped curved surface. The kitchen sink as claimed in item 1 of the patent application, wherein the bottom surface as a whole is inclined obliquely toward the side where the drain is provided in the front-back direction, in the left-right direction facing the front side of the sink. The kitchen sink according to claim 1 or 2, wherein a groove shape, a flat surface, or an inclined area composed of a combination of these is formed in the front end of the aforementioned sink.