JP2011021388A - Kitchen faucet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a kitchen faucet for accurately stopping or continuously discharging water even in a kitchen where a variety of complication operations are performed. <P>SOLUTION: This kitchen faucet includes a water discharge part for discharging water diagonally downward to the bottom surface of a sink, a sensor part for collecting, as detection signals, the information on a body to be detected, and a control unit which opens or closes a valve according to the detection signals from the sensor part and controls to discharge or stop the water from the water discharge part. A work table is provided adjacent to the sink. The sensor part is provided to the side surface of the sink which is adjacent to the work table, and emits radio wave diagonally downward so that the radio wave hits the discharged water flow discharged from the water discharge part along the flow direction. The control part closes the valve according to the detection signals based on the information on the discharged water flow detected by the sensor part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is a kitchen faucet equipped with a sensor unit, and the sensor unit is an invention relating to a kitchen faucet that detects the state of water flow using radio waves such as microwaves and controls spouting water.

Conventionally, a pair of photoelectric sensors is provided in the sink, and the object is detected by blocking light from the photoelectric sensor by holding an object to be detected such as a hand or tableware in the vicinity of the photoelectric sensor, thereby opening the valve. There was a stopper (see, for example, Patent Document 1).
However, as in Patent Document 1, when the light from the photoelectric sensor is interrupted, water discharge is started, and when there is no light interruption, the water is stopped. If it enters, the light from the photoelectric sensor will be blocked by a cooking utensil, etc., so that the water will remain discharged and the user may discharge water even in situations where the user does not want to discharge water. was there.

  Also, in the faucet that controls the water stoppage by detecting the presence of an object in the vicinity of the spout, such as a commonly used automatic faucet, in the sink or in the vicinity of the spout like a kitchen In places where various operations are performed, even if the user wants to stop the water, an object may be present in the detection range of the sensor, and the water may not be stopped in a timely manner.

Japanese Utility Model Publication No. 61-75570

  Therefore, the present invention has been made to solve the above-described problems, and provides a kitchen faucet for realizing water stoppage and water discharge continuation with higher accuracy even in a kitchen with many complicated operations. Is.

In order to achieve the above object, a water discharger that discharges water obliquely downward with respect to the bottom surface of the sink;
A kitchen faucet comprising: a sensor unit that collects information on the detected object as a detection signal; and a control unit that opens and closes a valve based on the detection signal from the sensor unit and controls water discharge from the water discharge unit. In the sink, a work table is provided adjacent to the sink, and the sensor unit is provided on a side surface of the sink adjacent to the work table in a flow direction of the discharged water flow discharged from the water discharge unit. The control unit is configured to close the valve in accordance with a detection signal based on the information on the discharged water flow detected by the sensor unit, so that the radio wave is emitted obliquely downward so that the radio wave is applied along the line. . In general, work in the kitchen is mainly done by operations such as cutting and mixing ingredients using a work table adjacent to the sink, and washing ingredients and cooking utensils near the faucet. By arranging the sensor unit on the back side of the sink side that is adjacent to the work table that extends from the side of the sink, it is easy to operate the sensor unit from the user in front of the work table or in front of the sink. It is possible to operate the sensor unit in a state where the load on the sensor is reduced. Furthermore, by emitting radio waves from the sensor unit obliquely downward along the water discharge flow, it is possible to set the transmission direction of the radio waves and the movement direction of the water discharge flow in substantially the same direction. Since it is possible to output a large amplitude value of the detection signal with respect to the movement of the water discharge flow, it becomes easy to distinguish it from noise, and it is possible to collect detection signals only for the state of the water discharge flow with higher accuracy. Therefore, since it is possible to reliably detect the detection signal of only the water discharge flow, it is possible to reliably detect the state where the user does not use the water discharge but only the water discharge flow, so the user uses the water discharge. If not, the valve can be reliably closed and water stop control in accordance with the user's intention can be realized. Furthermore, by radiating radio waves obliquely downward, it is possible to suppress the emission of radio waves above the sink, so it is difficult to detect the movement of the user during cooking near the sink open surface. It is possible to prevent erroneous detection that the user erroneously detects that the user is using water discharge due to the movement in the vicinity of the open surface of the sink and erroneously continues the water discharge.

  According to the second aspect of the present invention, the control unit opens the valve based on detection information in the vicinity of the side surface of the sink where the sensor unit is arranged, so that the water discharge operation is performed by the sensor unit. It is possible to separate the detected body for the water discharge operation and the water stop operation, such as the state of the water discharge flow with respect to the object to be detected, such as a human body or cooking utensil, and the water stop operation. As a result, even when a hand or cooking utensil approaches or near the sensor part during the valve opening operation, it is different from the detected object of the water stop operation. Since it becomes possible to prevent that being performed, more accurate water stop control and water discharge continuation can be performed. Furthermore, by performing water discharge based on the information on the detection object in the vicinity of the sensor unit, it is possible to prevent water discharge from being erroneously started by an operation in the sink or an operation in the vicinity of the water discharge port. In addition to water discharge, it is possible to perform control with higher accuracy.

  In addition, according to the invention described in claim 3, since the sensor unit is disposed above the sink on the side surface of the sink, it is possible to radiate radio waves to the entire water discharge flow inside the sink. When radio waves can be radiated to the entire water discharge flow existing inside the sink, it is possible to collect all the water discharge flow status inside the sink, thus preventing the state of the water discharge flow from being detected depending on the location. This makes it possible to perform water stop control and water discharge continuity more strictly. In addition, by installing the sensor unit above the side of the sink, even when operating to discharge water near the side where the sensor unit is installed, it is possible to operate without inserting a large hand into the sink. Therefore, it is possible to reduce the operation load on the user when the valve is opened.

  According to the invention of claim 4, the sensor unit is used in a state in which water stop control and water discharge continuation can be performed more strictly by being arranged at the approximate center in the depth direction of the sink side surface. It is possible for a person to easily perform a water discharge operation. If the sensor unit is installed at a location away from the user in the depth direction of the sink, problems such as being out of reach depending on the user's body shape occur, and the sensor unit is closer to the user When installed at a place, the operation is inconvenient because it is necessary to perform the operation with the elbow close to the body. Therefore, by disposing the sink approximately at the center in the depth direction, it becomes possible for any user to perform a water discharge operation without a heavy load on the body, so the usability of the kitchen faucet can be further improved. It becomes. Further, in the kitchen, in order to reduce a physical load such as a user reaching out greatly, cooking work and cleaning work are often performed on the front edge side of the sink in the depth direction. For this reason, when the sensor unit is arranged on the sink leading edge side, a detection signal corresponding to the work performed on the sink leading edge side is greatly output, and therefore, the detection signal of only the discharge water flow and the detection signal by the work on the sink leading edge side are output. Identification becomes difficult. In addition, since work in the kitchen is often performed on the front edge of the sink, the kitchen faucet discharges the water discharge toward the front edge of the sink. It is difficult to detect the detection signal. Therefore, by disposing the sensor part at the approximate center in the depth direction of the sink, it is difficult to detect the movement associated with the work of the user on the front edge of the sink, and it is possible to reliably detect the detection signal only of the discharged water flow. It becomes.

  According to the present invention, it is possible to collect detection signals of only the water discharge flow without being affected by the surrounding environment by radiating the radio wave from the sensor unit obliquely downward along the water discharge flow. By using the detection signal, water stop control is performed to prevent false actions due to the actions of the user of the kitchen faucet and the presence or absence of objects inside the sink, and prevent the user from unintentionally stopping water or continuing water discharge. It becomes possible.

Schematic configuration diagram of the kitchen faucet of the present invention Pipe and wiring configuration diagram of kitchen faucet of the present invention State diagram of radio wave transmission direction and water discharge flow in each water discharge state Frequency vs. signal intensity diagram for each water discharge state Schematic of water discharge control performed when the hand is almost stationary Schematic of water discharge control performed by hand movement and almost stationary state Sensor installation position diagram with respect to the sink vertical direction of the kitchen faucet of the present invention The sensor installation position figure with respect to the sink front-back direction of the kitchen faucet of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic configuration diagram of the kitchen faucet of the present invention, and FIG. 2 shows a piping configuration of the kitchen faucet of the present invention and a wiring configuration diagram of the sensor unit. 1 and 2 are based on a water discharge unit 2 that discharges water obliquely downward with respect to the bottom surface of the sink 1, a sensor unit 3 that collects information on the detected object as a detection signal, and a detection signal from the sensor unit 3. A kitchen faucet having a control unit 4 that opens and closes a valve 7 and controls discharge water from the water discharge unit 2, and a work table 5 is provided adjacent to the sink 1. The sensor unit 3 is provided on the sink side surface 6 adjacent to the work table 5 and emits radio waves obliquely downward so that the radio waves are applied along the flow direction of the water discharge flow discharged from the water discharge unit 2. It is configured to radiate.

  Here, first, the kitchen faucet of the present invention is configured to supply the water discharge flow in an oblique direction with respect to the bottom surface of the sink (in FIG. 1, water is discharged obliquely downward from the rear to the front side). With such a configuration, in order to supply the water discharge flow to a place where the user can easily use the water discharge flow like a conventional kitchen faucet that discharges water in a substantially vertical direction, the water discharge port exists above the sink. It is possible to supply the water discharge to a place that is easy for the user to use. This makes it possible to reduce the volume occupied by the spout having the spout above the sink, so that it is possible to have a large space above the sink, so that the work space is wide for work in the kitchen, particularly in the sink. It is possible to have an effect that spout does not enter the field of view.

  The sensor unit is installed on the sink side surface adjacent to the work table extending from the sink side surface. In the work in the kitchen, there are a lot of work such as cutting and mixing ingredients on the work table and washing ingredients and cooking utensils in the sink, and most of the places where users stay in the sink are sinks. Or on the near side of the workbench. Therefore, by installing the sensor unit on the side of the sink adjacent to the workbench, when operating the sensor unit from a user on the front side of the sink or workbench, only the hand is moved without greatly moving the body. Since the operation can be performed by moving, it is possible to easily operate the sensor unit.

  Furthermore, the sensor unit is configured to radiate a radio wave to be transmitted obliquely downward along the water discharge flow. As described above, the work in the kitchen is very complicated, and simply checking the presence / absence of the object to be detected is whether the object to be detected exists for the control of the water stoppage or for the control of the water discharge. It is difficult to determine whether the operation is broken. Therefore, in the present invention, the state of the supplied water discharge flow is detected, and the opening / closing control of the valve is performed according to the state of the water discharge flow. Therefore, in order to detect the state of the discharged water flow with higher accuracy, it is desirable to radiate radio waves along the traveling direction of the discharged water flow. In a sensor using radio waves, a signal (Doppler signal) accompanying the movement of a moving object can be easily detected by setting the moving direction of the object and the transmission direction of the radio wave to be substantially the same direction. Furthermore, by radiating diagonally downward along the water discharge flow, it becomes possible to detect the movement of only the water discharge flow without detecting the movement of the object above the sink and the noise generated by the fluorescent lamp. A detection signal having a high / N ratio can be obtained. With the above configuration, by radiating radio waves obliquely downward along the water discharge flow, it becomes possible to extract more information on only the water discharge flow without detecting noise.

  Here, the water discharge control of the kitchen faucet of the present invention will be described in detail. In the kitchen faucet of the present invention, water discharge control is performed to determine whether or not to perform water discharge based on detection information of a detected object such as a hand or cooking utensil near the sink side surface where the sensor unit is installed, It is set as the structure which performs the water stop control which determines whether water stop is performed based on the detection information of the discharged water flow supplied from. Here, the reason why the detected bodies that perform the water discharge control and the water stop control are different from each other is that if the detected bodies for the water discharge control and the water stop control are the same, a complicated work like a kitchen is performed. In a place, it becomes difficult to determine whether the movement or object is due to water discharge or water stoppage. Therefore, if the object to be detected for water discharge control and water stop control are completely different objects and the object is identified by the characteristics of the movement of the object, it is possible to determine which control the user intends. As a result, water discharge and water stop control can be performed with higher accuracy.

  First, it describes about water stop control. In the kitchen faucet of the present invention, valve closing control is performed based on the state of water discharge detected from the sensor unit. Here, the state of the water discharge flow used for the water stop control of the present invention is the scattered water that falls when the water discharge flow hits the object to be cleaned and the hand generated when the water discharge flow is used in the cleaning operation or the like. There are two states: a state where there is no water discharge flowing into the sink when pumping water into a pot or a cup, and a state where only the water discharge occurs when the water discharge is not used. The control unit of the present invention can identify the state of the water discharge flow, for example, by a difference in frequency. Here, FIG. 3 shows a schematic configuration diagram of the state of each water discharge flow, and FIG. 3 shows a schematic diagram in which the state of each water discharge flow is classified by frequency.

  FIG. 3A shows a state of only the water discharge flow. In the case of only the water discharge flow, the water reaches the sink bottom surface at the flow velocity discharged from the water discharge portion. Therefore, like the kitchen faucet of the present invention, when the radio wave transmitted from the sensor unit is radiated obliquely downward along the water discharge flow, it is possible to output a detection signal at substantially the same speed as the flow rate of the water discharge flow. Become. FIG. 3B shows the state of the discharged water flow in which scattered water is generated. When the object to be cleaned is inserted into the discharged water flow, the discharged water flow that collides with the object to be cleaned becomes particles and falls downward. At this time, the flow velocity when discharged from the water discharge portion collides with the object to be cleaned, so that it is greatly decelerated, and the velocity when dropping downward becomes the velocity associated with gravity. Therefore, since the radio wave transmitted from the sensor unit and the direction in which the scattered water falls are not substantially the same, the speed of the scattered water is output as a lower speed. Detection signals with significantly different speeds are output. FIG. 3C shows the state of the water discharge when water is drawn into a pot or cup. In order to draw water, almost all of the discharged water flow is stored inside the container, so that the discharged water flow disappears below the sink. Therefore, since the radio wave transmitted from the sensor unit almost does not cross the discharged water flow, the detection signal from the sensor unit is hardly output.

  The state of each of the above water discharge flows is shown in FIG. As described above, in the case of only the water discharge flow, the detection signal is output at almost the same speed as the speed discharged from the water discharge section, so that the detection signal can be output in the vicinity of an arbitrary speed. It becomes. At this time, the voltage value (intensity) of the detection signal varies depending on the state of the water discharge flow (for example, rectified water discharge or shower water discharge). Further, the state of the scattered water is reduced from the speed discharged from the water discharge unit, and the speed is further reduced because the transmission direction of the radio wave is different from the falling direction of the scattered water. Therefore, since the speed is greatly reduced as compared with the state of only the water discharge flow, it can be easily distinguished from the state of the water discharge flow only. However, since scattered water is scattered in various directions below the sink, the frequency width of the detection signal indicating the state of the scattered water is widened, but radio waves are transmitted from the sensor unit along the state of the water discharge only. Therefore, a difference occurs between the detection signal obtained from the state of the scattered water and the detection signal of only the discharged water flow. Moreover, when the state of scattered water has a very wide detection signal, it is desirable to confirm the periodicity of the waveform of the detection signal. Although it is possible to output a detection signal with almost regularity in the state of only the water discharge flow, the scattered water becomes irregular depending on the shape of the object to be cleaned, the cleaning method, etc. It is possible to determine whether the water flow alone or scattered water.

  Furthermore, in the state where water is being pumped, when the radio wave is transmitted obliquely downward like the kitchen faucet of the present invention, the state of the water discharge flow when water is being pumped is detected. Therefore, the detection signal is not output. Or, when water is pumped in the state where the container for water pumping is placed on the bottom of the sink, the water discharge will be convective inside the container, but the radio waves will detect the water discharge through the container. The voltage value cannot be output and is not output as a detection signal. As described above, it is possible to identify the state of only the water discharge flow, the state of scattered water, and the state of pumping water by frequency.

  Here, although water stop control is performed using the state of water discharge, it is necessary to identify various movements of the kitchen and movements of only the water discharge flow. In the present invention, since the radio wave transmitted from the sensor unit is transmitted obliquely downward along the water discharge flow, it is difficult to detect the movement of the user above the sink and the movement of the cooking utensil or the like on the bottom of the sink As described above, since it can be identified by the difference in frequency, it is possible to easily identify the state of only the water discharge flow. Since the state of only the water discharge flow is a state that does not use the water discharge flow, the water stop control is performed using only the state of the water discharge flow, so that the water can be stopped accurately without taking into account various actions in the kitchen. Can be performed. In addition, since it is possible to automatically stop the water without performing a separate water stop operation, it is possible to easily move to the work after using the water discharge flow, so that the work efficiency in the kitchen is improved. In addition, since it becomes possible to reduce water during the water stop operation, it is possible to have a water saving effect.

  Next, it describes about water discharge control. In this invention, it is set as the object of the sink side surface vicinity in which the sensor part is installed as a to-be-detected body for performing water discharge control. Therefore, it becomes an object that is different from the object to be detected for water stop control, and it is possible to avoid the situation where water discharge and water stop control cannot be performed accurately by judging only the presence or absence of an object like conventional photoelectric sensors. It becomes. Here, in the water discharge control, for example, the water discharge control is started by identifying that the detected object performs an operation on the sink side surface where the sensor unit is installed. Here are some examples of certain operations. FIG. 5 shows a case where water discharge control is started when the object to be detected is held over the side surface of the sink where the sensor unit is installed. When the object to be detected is held over the sink side surface on which the sensor unit is installed, the holding operation is substantially stationary. Therefore, the detection signal output from the sensor unit is a very low frequency (0 to several Hz) detection signal. At this time, it is possible to make a determination based on the amplitude value of the detection signal in order to distinguish it from a cooking utensil or the like placed inside the sink. Therefore, by setting the detection distance (the voltage threshold for recognizing the water discharge operation) to be determined as the water discharge operation to be in the vicinity of the sink side surface, water discharge control is not performed with a cooking utensil or the like placed inside the sink. Thus, it is possible to perform water discharge control in accordance with the user's intention. In addition, it is possible to output a detection signal having a large voltage value by holding the object to be detected in front of the sensor unit, so that it can be used by installing a visible marker on the side of the sink immediately in front of the sensor unit. Since it is possible to prompt the person to perform an operation to an optimal place, it is possible to output a detection signal having a larger voltage value, and it is possible to perform reliable water discharge control only for the water discharge operation.

  Moreover, it shows about performing water discharge control by performing the operation | movement which holds a to-be-detected body after approaching with respect to the sink side surface which installed the sensor part in FIG. In the case of FIG. 5, when a pan is placed near the side of the sink where the sensor unit is installed, or when a wet cloth or the like is placed on the side of the sink, it can be determined that the detected object is held up. Therefore, in FIG. 6, the water discharge control is performed by identifying the movement immediately before the further holding operation. Here, first, a detection signal of a high frequency is output when the detected object approaches, and when approaching the sink side surface where the sensor is installed, deceleration is started in order to suppress the collision of the detected object with the sink side surface. The detection signal gradually becomes a low frequency, and a substantially stationary detection signal is output. At this time, the voltage value of the detection signal also gradually approaches the sensor unit from a distance, so that the amount of radio waves reflected from the detected object increases, and therefore the voltage value of the detection signal tends to increase gradually. In this way, a detection signal in which the frequency is gradually reduced and the voltage value is gradually increased is obtained, and water discharge control is performed when the detection signal is further substantially stationary. As a result of the above determination, it is possible to identify the operation such as placing a pot in the sink, so that it is possible to more precisely identify the operation for performing water discharge and other operations, and the water discharge control can be performed more accurately. It becomes possible to carry out.

  In addition, regarding the water discharge control in the present embodiment, the structure that is determined in the substantially stationary state and the approaching operation and the substantially stationary state has been described, but the characteristic operation of the detected object with respect to the sink side surface where the sensor unit is installed (for example, By discriminating a separation operation after a substantially stationary state, a snapping operation, and the like, it is possible to identify the operation generated by the kitchen work, and it is possible to perform the water discharge control with higher accuracy.

  Next, it describes about the installation place of the sensor part in the kitchen faucet of this invention. First, FIG. 7 shows an optimum installation location in the vertical direction of the sink. FIG. 7: shows the sink side view of the kitchen faucet of this invention. Here, the sensor unit is installed above the side surface of the sink, and is configured to transmit radio waves obliquely downward along the water discharge flow from above the sink. By installing the sensor unit on the upper side of the sink, the sensor unit can output a detection signal for the movement of the water discharge flow between the upper side of the sink and the bottom surface of the sink by the transmitted radio wave. It is possible to reliably detect a change in the state of the water discharge flow inside. Therefore, even if the object to be cleaned comes into contact with the discharged water flow at a different height relative to the discharged water flow inside the sink, it is possible to reliably detect the scattered water. It is possible to perform water stop control along the line and continue water discharge. Furthermore, by radiating diagonally downward along the water discharge flow, radio waves are no longer emitted above the upper surface of the sink, so that the movement of the user above the sink and the detection of noise from fluorescent lamps are suppressed. Therefore, it is possible to optimally perform the water discharge / water stop control while removing information similar to the state of only the water discharge flow or the state of the scattered water.

  Further, FIG. 8 shows the installation location of the sensor unit in the front-rear direction of the sink. In the present embodiment, it is desirable to arrange the sensor unit in the vicinity of the sink center part with respect to the sink front-rear direction. The kitchen faucet according to the present invention performs water discharge control based on information on a body to be detected in the vicinity of the sink side surface where the sensor unit is installed. Therefore, when the sensor unit is installed behind the sink as shown in FIG. 8B, when a user who uses the kitchen faucet operates in front of the sink, Since there is a possibility that the operation may be performed in an act that is not often performed in the kitchen work such as stretching, the load on the body becomes large. 8C, when the sensor unit is installed in front of the sink, when the sensor unit is operated, the elbow of the user is separated from the body and the elbow is bent. Therefore, it is possible to work without any load on the body in the kitchen work, and the elbow is in the vicinity of the body, and it is greatly different from the state where the elbow is bent lightly. A load will always be generated. Therefore, by installing the sensor part in the vicinity of the center part in the front-rear direction of the sink as shown in FIG. 8A, the user does not greatly extend his hand and does not perform the act of bending the elbow which is not normally performed. Since it becomes possible to operate the sensor unit, it is possible to realize an operation system that reduces the physical load on the user. Furthermore, by installing the sensor unit in the vicinity of the central part with respect to the front-rear direction of the sink and in the sink information, it becomes possible to reduce the load on the user with respect to the operation on the sensor unit for performing water discharge control. Furthermore, since it is possible to reliably detect the state of the water discharge inside the sink, it is possible to realize a kitchen faucet that can perform water stop control and continue water discharge in accordance with the user's intention. Become.

  As described above, since the radio wave transmitted from the sensor unit is transmitted obliquely downward along the water discharge flow, it is possible to reliably detect the state of the water discharge flow, so that a complicated movement like a kitchen is caused. Even in many places, it is possible to provide a kitchen faucet capable of reliably performing water stop control in accordance with the intention of the user. Furthermore, the installation location of the sensor above the sink and in the vicinity of the center of the sink in the front-rear direction makes it possible to detect the state of water discharge inside the sink in more detail. In addition, it is possible to provide a kitchen faucet that can be operated while reducing the load on the user's body when performing an operation for discharging water to the sensor unit.

DESCRIPTION OF SYMBOLS 1 ... Sink, 2 ... Water discharge part, 3 ... Sensor part, 4 ... Control part, 5 ... Work table, 6 ... Sink side surface, 7 ... Valve, 8 ... Water discharge flow, 9 ... Direction of advancing water flow, 10 ... Radio wave Transmission direction, 11 ... object to be cleaned, 12 ... scattered water, 13 ... hand, 14 ... hand movement direction

Claims (4)

A water discharge section for discharging water obliquely downward with respect to the bottom surface of the sink;
A sensor unit that collects information on the detected object as detection signals;
A control unit that opens and closes a valve based on a detection signal from the sensor unit, and controls water discharge from the water discharge unit;
A kitchen faucet comprising:
A work table is provided adjacent to the sink,
The sensor unit is provided on a sink side surface adjacent to the work table,
Radiating radio waves obliquely downward so that radio waves strike along the flow direction of the water discharge flow discharged from the water discharge unit,
The said control part closes a valve according to the detection signal based on the information of the discharged water flow detected by the said sensor part, The kitchen faucet characterized by the above-mentioned. The kitchen faucet according to claim 1, wherein the controller opens the valve based on detection information in the vicinity of a side surface of the sink where the sensor unit is arranged. The kitchen faucet according to any one of claims 1 to 2, wherein the sensor unit is disposed above the sink on the side surface of the sink adjacent to the work table. The kitchen faucet according to any one of claims 1 to 3, wherein the sensor unit is disposed at a substantially center in a depth direction of a side surface of the sink adjacent to the work table.

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