Patent Publication Number: US-2020277770-A1

Title: Height-adjustable sink

Description:
TECHNICAL FIELD 
     The present disclosure relates to a height-adjustable sink. 
     BACKGROUND ART 
     In general, sinks are installed in the kitchens of homes or restaurants and used to clean food or tableware, and the installation height of sinks is based on a reference height that matches the height of a normal standing adult. 
       FIG. 1  is a perspective view illustrating a sink  1  of the related art. 
     Referring to  FIG. 1 , the sink  1  of the related art includes a main body  2  and an upper plate  3  provided on an upper portion of the main body  2 . The upper plate  3  includes a sink table  4  used to wash tableware, and a cooking table  5  used to dry tableware or clean food stuff. The main body  2  may include a door  6  that may be selectively opened and closed, a storage compartment  7  used to store tableware or cooking utensils, and a drawer (not shown). 
     In the sink  1  of the related art, the main body  2  and the upper plate  3  are fixed, and thus height adjustment is impossible. 
     Therefore, when children or disabled persons having a height less than the reference height are to use the sink  1 , they have to use an additional foot plate to adjust their height to the reference height, making it inconvenient to use the sink  1 . Conversely, people having a height greater than the reference height have to inconveniently bend over to use the sink  1 . 
     DESCRIPTION OF EMBODIMENTS 
     Technical Problem 
     To solve the above-described problems of the related art, the present disclosure provides a sink including a height adjusting device for users having different heights to easily adjust the height of the sink. 
     Solution to Problem 
     According to an embodiment of the present disclosure for achieving the above-described objectives, a height-adjustable sink includes: a main body including a storage compartment; an upper plate placed on an upper side of the main body and including at least one of a sink table and a cooking table; and a height adjusting device configured to adjust a height of the at least one of the sink table and the cooking table with respect to the main body. 
     In addition, a height of the upper plate is adjusted as a whole with respect to the main body to simultaneously adjust heights of the sink table and the cooking table. 
     In addition, the upper plate includes a penetration portion through which the at least one of the sink table and the cooking table penetrates, and the at least one of the sink table and the cooking table is vertically moved through the penetration portion. 
     In addition, the upper plate includes a fixed upper plate having a fixed height and a movable upper plate movably provided on the main body and adjustable in height, wherein the sink table is provided on one of the fixed upper plate and the movable upper plate, and the cooking table is provided on the other of the fixed upper plate and the movable upper plate. 
     The height-adjustable sink further includes a manipulation portion provided on the upper plate; and a transmission portion configured to transfer manipulation force from the manipulation portion to the height adjusting device. 
     Advantageous Effects of Disclosure 
     According to the present disclosure, since the height of at least one of an upper plate or a lift plate of a sink is adjustable according to the height of a user, the user may more conveniently use the sink. 
     In addition, since the height of the upper plate or the lift plate is adjustable using a manipulation portion provided on the sink, a user may conveniently perform height adjustment. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a sink of the related art. 
         FIGS. 2A and 2B  are perspective views illustrating a sink according to a first embodiment of the present disclosure. 
         FIGS. 3A and 3B  are cross-sectional views illustrating the sink of the first embodiment of the present disclosure. 
         FIG. 4  is a cross-sectional view illustrating the assembly of a manipulation portion and a holding unit according to the first embodiment of the present disclosure. 
         FIG. 5  is a perspective view illustrating the assembly of an upper plate frame, a main body frame, and a gas cylinder according to the first embodiment of the present disclosure. 
         FIG. 6  is a perspective view illustrating a sink according to a second embodiment of the present disclosure. 
         FIG. 7  is a front view illustrating the sink of the second embodiment of the present disclosure. 
         FIG. 8  is a side view illustrating the sink of the second embodiment of the present disclosure. 
         FIG. 9  is a perspective view illustrating a connecting member according to the second embodiment of the present disclosure. 
         FIG. 10  is a perspective view illustrating a sink according to a third embodiment of the present disclosure. 
         FIG. 11  is a front view illustrating the sink of the third embodiment of the present disclosure. 
         FIG. 12  is a side view illustrating the sink of the third embodiment of the present disclosure. 
         FIG. 13  is a perspective view illustrating a sink according to a fourth embodiment of the present disclosure. 
         FIG. 14  is a cross-sectional view illustrating a sink table according to the fourth embodiment of the present disclosure. 
         FIG. 15  is a cutaway view illustrating a cooking table according to the fourth embodiment of the present disclosure. 
         FIG. 16  is a cutaway view illustrating a sink table according to a fifth embodiment of the present disclosure. 
         FIG. 17  is a perspective view illustrating a connecting member of the sink table according to the fifth embodiment of the present disclosure. 
         FIG. 18  is a cutaway view illustrating a cooking table according to the fifth embodiment of the present disclosure. 
         FIG. 19  is a perspective view illustrating a connecting member of the cooking table according to the fifth embodiment of the present disclosure. 
         FIG. 20  is a perspective view illustrating a sink according to a sixth embodiment of the present disclosure. 
     
    
    
     MODE OF DISCLOSURE 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals denote like elements, and overlapping descriptions thereof will be omitted. In the following description, terms ending with “module” and “unit” are used or interchangeably used only for ease of description, and it is not intended to distinguish meanings or functions with the terms. Moreover, in the following descriptions of embodiments, detailed descriptions related to well-known techniques may not be presented in order not to unnecessarily obscure subject matters of the embodiments of the present disclosure. In addition, the accompanying drawings are only for helping easy understanding of the embodiments of the present disclosure and are not for limiting the technical idea of the present disclosure, and it should be understood that modifications, equivalents, and replacements could be made without departing from the technical idea and scope of the present disclosure. 
       FIGS. 2A and 2B  are perspective views illustrating a sink according to a first embodiment of the present disclosure,  FIG. 2A  illustrates a state in which an upper plate is placed at a lowest position, and  FIG. 2B  illustrates a state in which the upper plate is placed at a highest position.  FIGS. 3A and 3B  are cross-sectional views illustrating the sink of the first embodiment of the present disclosure,  FIG. 3A  illustrates a state in which the upper plate is placed at the lowest position, and  FIG. 3B  illustrates a state in which the upper plate is placed at the highest position.  FIG. 4  is a cross-sectional view illustrating assembly of a manipulation portion and a holding unit according to the first embodiment of the present disclosure.  FIG. 5  is a perspective view illustrating assembly of an upper plate frame, a main body frame, and a gas cylinder according to the first embodiment of the present disclosure. 
     Referring to  FIGS. 2 and 5 , the sink  10  of the embodiment of the present disclosure may include a main body  11 , the upper plate  20  placed on an upper portion of the main body  11 , and a height adjusting device placed inside the main body  11  to connect the main body  11  and the upper plate  20  to each other and adjust the height of the upper plate  20  with respect to the main body  11 . 
     The height adjusting device may adjust the heights of the main body  11  and the upper plate  20  and may include the holding unit  40  for maintaining the adjusted heights. 
     The main body  11  forms a lower portion of the sink  10  and supports the upper plate  20  in contact with the ground or floor. 
     The main body  11  may include the main body frame  15  forming a storage compartment  90 , and a door  80  rotatably connected to the main body frame  15  for opening and closing the storage compartment  90 . 
     The main body  11  may further include a drawer  95  configured to slide out and in. 
     The upper plate  20  may have a flat plate shape such that food or cooking utensils may be placed thereon. 
     The upper plate  20  may include a sink table  200  and a cooking table  300 . 
     A front surface  21  of the upper plate  20  may cover the front side of the main body  11  such that a gap between the upper plate  20  and the main body  11  may not be seen from the outside when the height of the upper plate  20  is increased. In addition, the manipulation portion  60  may be provided on the front surface  21  of the upper plate  20  to operate the holding unit  40  (described later), and a handle  70  may be provided on the front surface  21  of the upper plate  20  to apply force when raising or lowering the upper plate  20 . 
     However, the positions of the manipulation portion  60  and the handle  70  are not limited to the front surface  21 . For example, the manipulation portion  60  and the handle  70  may be provided on a surface of the main body  11  or the door  80  instead of on a surface of the upper plate  20 . 
     In addition, although not shown in the drawings, the front surface  21  and lateral surfaces  23  of the sink  10  may have a bellows structure. Here, the bellows structure refers to a wave-shaped shield structure configured to be folded when the upper plate  20  is at a minimum height and unfolded when the upper plate  20  is at a maximum height. 
     The sink table  200  includes a sink bowl  210  having a downwardly convex shape for washing tableware or storing water, a faucet  230  placed apart from an upper side of the sink bowl  210  and connected to a water supply pipe to drop water to the sink bowl  210 , and a drain hole  240  formed in a lowermost surface of the sink bowl  210  to drain water from the sink bowl  210 . 
     In the drawings, the sink table  200  is illustrated as having a tetragonal shape. However, the sink table  200  is not limited thereto. For example, the sink table  200  may have a circular or polygonal shape. 
     The cooking table  300  provides a multi-use space for preparing food ingredients and placing tableware after or before washing, and a plurality of anti-slip ridges or a plurality of water-draining curved portions may be formed on the cooking table  300 . In addition, a cutting board may be placed on the cooking table  300  to cut food ingredients with a knife. 
     The upper plate  20  may include the upper plate frame  25  slidably coupled to a portion of the main body frame  15 . The upper plate frame  25  may extend from a lower surface of the upper plate  20  and may accommodate a portion of the main body frame  15 . That is, the upper plate frame  25  may include an accommodation portion  27  to accommodate a portion of the main body frame  15 . Conversely, the upper plate frame  25  may be accommodated in the main body frame  15 . 
     In addition, a plurality of upper plate frames  25  may extend from the upper plate  20  for height adjustment of the upper plate  20  without horizontal wobbling. 
     To prevent relative rotation in a state in which the upper plate frame  25  and the main body frame  15  are connected to each other, each of the upper plate frame  25  and the main body frame  15  may have a non-circular horizontal cross-sectional shape. The main body frame  15  and the upper plate frame  25  include protrusions  16  and  26  for fastening the holding unit  40  thereto. 
     The protrusions  16  and  26  may horizontally formed respectively on the main body frame  15  and the upper plate frame  25 . In this case, the protrusions  16  and  26  may be spaced apart from each other in a vertical direction, and the holding unit  40  may be fastened to each of the protrusions  16  and  26 . 
     The holding unit  40  may include a gas spring  41 . An end of the gas spring  41  may be coupled to one of the protrusions  16  and  26 , and the other end of the gas spring  41  may be coupled to the other of the protrusions  16  and  26 . 
     The gas spring  41  includes a cylinder  42  having a hollow tube shape and a piston rod  43  inserted into a hollow portion inside the cylinder  42 . The length of the gas spring  41  is varied as the piston rod  43  vertically operates with respect to the cylinder  42 . That is, gas is injected into the cylinder  42 , and the position of the piston rod  43  is varied by pressure applied by the gas to the piston rod  43 . A gas opening/closing pin  44  for selectively opening and closing internal gas and an opening/closing guide  45  for operating the gas opening/closing pin  44  are provided on an upper side of the piston rod  43 , and an end of a cable  61  is connected to the gas opening/closing pin  44  and the opening/closing guide  45 . 
     The cable  61  may be connected to the manipulation portion  60  through at least one link  62 . 
     Therefore, when the manipulation portion  60  is manipulated, the at least one link  62  may be operated by the manipulation portion  60 , and thus the cable  61  may be pulled to move gas filled in the gas spring  41  and thus to vertically move the piston rod  43  by pressure of the gas. In addition, when force pulling the cable  61  is removed, the position of the piston rod  43  is fixed. 
     In another example, a hydraulic cylinder or a pneumatic cylinder having a length variable using the pressure of a fluid or air may be used as a holding unit instead of the gas spring  41 . The gas spring  41  may be implemented by well-known technology, and thus a detailed description thereof will not be presented here. 
     In the current embodiment, gas injected into the cylinder  42  applies pressure to the piston rod  43  to push the piston rod  43 , and then the protrusion  16  provided on the main body frame  15  and the protrusion  26  provided on the upper plate frame  25  are moved away from each other, thereby moving the upper plate frame  25  away from the main body frame  15 . 
     Conversely, when the gas is discharged from the inside of the cylinder  42 , the piston rod  43  is moved into the cylinder  42 , and the distance between the protrusions  16  and  26  is decreased. Thus, the upper plate frame  25  is placed close to the main body frame  15 . In this case, since both ends of the main body frame  15  are inserted into accommodation portions  27  located on both sides of the upper plate frame  25 , the height of the upper plate  20  may be decreased with respect to the main body  11 . 
     Hereinafter, operations for adjusting the height of the sink  10  will be described. 
     Detailed manipulation operations are as follows. If the manipulation portion  60  is manipulated by a user, manipulation force is transmitted from the manipulation portion  60  to the gas spring  41  through the at least one link  62  and the cable  61 . That is, it may be understood that in a state in which the manipulation portion  60  is pushed, the length of the gas spring  41  is variable. In other words, in a state in which the manipulation portion  60  is pushed, the upper plate  20  is moved upward away from the main body  11  by pressure of gas filled in the gas spring  41 . 
     In detail, when it is intended to raise the upper plate  20 , the manipulation portion  60  is pushed, and when it is intended to lower the upper plate  20 , the upper plate  20  is pushed downward in a state in which the manipulation portion  60  is pushed. 
     In addition, during height adjustment, the handle  70  provided on the upper surface  20  at a position close to the manipulation portion  60  may be used. That is, while pushing the manipulation portion  60 , the handle  70  may be raised or lowered for height adjustment. 
     Furthermore, in the current embodiment, the main body frame  15  and the upper plate frame  25  are described as having a flat plate shape. However, a truss structure formed by bars may be used as a frame supporting the upper plate  20 . 
       FIG. 6  is a perspective view illustrating a sink according to a second embodiment of the present disclosure,  FIG. 7  is a front view illustrating the sink of the second embodiment of the present disclosure,  FIG. 8  is a side view illustrating the sink of the second embodiment of the present disclosure, and  FIG. 9  is a perspective view illustrating a connecting member according to the second embodiment of the present disclosure. 
     The current embodiment is the same as the first embodiment except for the shape of an upper plate  20 , the configuration of a connecting member  30 , and the arrangement of a holding unit  40 . Therefore, in the following description, only characteristic parts of the current embodiment will be described, and descriptions of the same parts as those in the first embodiment will be substituted with previous descriptions. 
     Referring to  FIGS. 6 to 9 , a front portion of the upper plate  20  of the current embodiment may protrude forward more than a main body. A manipulation portion may be provided on a lower surface of the front portion of the upper plate  20 . 
     A user may hold the upper plate  20  and adjust the height of the upper plate  20  while pressing the manipulation portion  60 . Although not shown in the drawings, a handle may be further provided on a side of the upper plate  20 . 
     A shield wall  24  may be formed on a lower surface of the upper plate  20  in a downward direction. Owing to the shield wall  24 , a gap between the upper plate  20  and the main body  11  may not be exposed in a state in which the height of the upper plate  20  is increased. 
     The sink  10  of the current embodiment may further include the connecting member  30  supporting the upper plate  20  and connected to the holding unit  40 . 
     The connecting member  30  may include a first connecting member  31  rotatably connected to the main body  11 , and a second connecting member  32  rotatably connected to the upper plate  20 . 
     The first connecting member  31  may be rotatably connected to the second connecting member  32 . 
     An extension portion  33  may be provided on the upper plate  20  such that the first connecting member  31  and the second connecting member  32  may have short lengths, and each of the first connecting member  31  and the second connecting member  32  may be connected to the extension portion  33 . 
     The first connecting member  31  and the second connecting member  32  may cross each other inside the main body  11  and may thus approximately form an ‘X’ shape when viewed from a side. 
     An end of the first connecting member  31  is coupled to a first coupling portion  110  provided on the main body  11 , and the other end of the first connecting member  31  is coupled to a first movement portion  130  slidable on a first movement frame  120  provided on the upper plate  20 . First coupling portions  110  and first movement frames  130  may be provided on both sides of the main body  11  and both sides of the upper plate  20  according to the number of first connecting members  31 . 
     The first coupling portion  110  includes: a first horizontal portion  111  coupled to the main body  11  using a screw or link; and a first vertical portion  112  extending upward from a side of the first horizontal portion  111  and coupled to the end of the first connecting member  31 . In addition, the end of the first connecting member  31  is rotatably hinged to a lateral surface of the first vertical portion  112 . That is, the end of the first connecting member  31  is rotatably coupled to the first vertical portion  112  using a first hinge pin  113  inserted through the first connecting member  31  and the first vertical portion  112 . 
     First movement frames  120  may be provided respectively on both sides of the upper plate  20 . The first movement frame  120  includes: a first upper surface portion  121  having an upper surface coupled to the lower surface of the upper plate  20 ; and a first lateral surface portion  122  extending downward from a side of the first upper surface portion  121 ; and a first lower surface portion  123  extending inward from an end portion of the first lateral surface portion  122 . A lateral side of the first movement frame  120  approximately has a ⊏-shape formed by the first upper surface portion  121 , the first lateral surface portion  122 , and the first lower surface portion  123 . In addition, an outer surface of the first movement portion  130  is slidable in a space formed by the first upper surface portion  121 , the first lateral surface portion  122 , and the first lower surface portion  123  of the first movement frame  120 . 
     The other end of the first connecting member  31  is hinged to a lateral surface of the first movement portion  130  such that when the first movement portion  130  slides along the first movement frame  120 , the inclination of the first connecting member  31  may vary. In other words, since the first connecting member  31  is hinged to the first vertical portion  112  and the first movement portion  130 , the angle of the first connecting member  31  is varied with respect to the upper plate  20  and the main body  11 . When the angle between the first connecting member  31  and the main body  11  is relatively large, the first movement portion  130  is relatively close to a front side of the first movement frame  120 , and when the angle between the first connecting member  31  and the main body  11  is relative small, the first movement portion  130  is relatively close to a rear side of the first movement frame  120 . While the other end of the first connecting member  31  slides, the end of the first connecting member  31  may rotate on the first coupling portion  110 . 
     An end of the second connecting member  32  is coupled to a second coupling portion  150  provided on the upper plate  20 , and the other end of the second connecting member  32  is coupled to a second movement portion  170  slidable on a second movement frame  160  provided on the main body  11 . Second coupling portions  150  and second movement frames  160  may be provided on both sides of the lower surface of the upper plate  20  and both sides of an upper surface of the main body  11  according to the number of second connecting members  32 . 
     The second coupling portion  150  includes: a second horizontal portion  152  having an upper surface coupled to the lower surface of the upper plate  20  using a screw or link; and a second vertical portion  151  extending downward from a side of the second horizontal portion  152  and coupled to the end of the second connecting member  32 . The end of the second connecting member  32  is rotatably hinged to a lateral surface of the second vertical portion  151 . That is, the end of the second connecting member  32  is rotatably coupled to the second vertical portion  151  using a hinge pin inserted through the second connecting member  32  and the second vertical portion  151 . 
     Second movement frames  160  may be provided respectively on both sides of the main body  11 . The second movement frame  160  includes: a second lower surface portion  161  having a lower surface coupled to the upper surface of the main body  11 ; a second lateral surface portion  162  extending upward from a side of the second lower surface portion  161 ; and a second upper surface portion  163  extending outward from an end portion of the second lateral surface portion  162 . A lateral side of the second movement frame  160  approximately has a ⊏-shape formed by the second lower surface portion  161 , the second lateral surface portion  162 , and the second upper surface portion  163 . In addition, a second movement portion  170  is provided on the second movement frame  160  and is slidable in a space formed by the second lower surface portion  161 , the second lateral surface portion  162 , and the second upper surface portion  163 . 
     The other end of the second connecting member  32  is hinged to a lateral surface of the second movement portion  170  such that when the second movement portion  170  slides along the second movement frame  160 , the inclination of the second connecting member  32  may vary. In other words, since the second connecting member  32  is hinged to the second vertical portion  151  and the second movement portion  170 , the angle of the second connecting member  32  is varied with respect to the upper plate  20  and the main body  11 . 
     When the angle between the second connecting member  32  and the main body  11  is relatively large, the second movement portion  170  is relatively close to a front side of the second movement frame  160 , and when the angle between the second connecting member  32  and the main body  11  is relative small, the second movement portion  170  is relatively close to a rear side of the second movement frame  160 . While the other end of the second connecting member  32  slides, the end of the second connecting member  32  may rotate on the second coupling portion  150 . 
     In summary, the first coupling portion  110  and the second coupling portion  150  are symmetrically provided between the lower surface of the upper plate  20  and the main body  11 , and the first movement frame  120  and the second movement frame  160  are symmetrically provided between the lower surface of the upper plate  20  and the main body  11 . 
     In addition, the first coupling portion  110  and the second movement frame  160  coupled to the upper plate  20  may be provided in one piece, and the second coupling portion  150  and the first movement frame  120  coupled to the main body  11  may be provided in one piece. 
     In addition, unlike in the first embodiment in which the holding unit  40  is fastened between the main body frame  15  and the upper plate frame  25 , the holding unit  40  may be placed between the first and second connecting members  31  and  32 . The holding unit  40  may include a gas spring  41 . 
     In detail, a protrusion may be formed on a lateral surface of one of the first and second connecting members  31  and  32  to couple an end of the holding unit  40  to the protrusion, and a protrusion may be formed on a lateral surface of the other of the first and second connecting members  31  and  32  to couple the other end of the holding unit  40  to the protrusion, such that the holding unit  40  may be fastened between the protrusions. 
     When the length of the gas spring  41  is varied according to a user&#39;s manipulation, the first movement portion  130  and the second movement portion  170  may slide respectively on the first movement frame  120  and the second movement frame  160 . If pressing force applied to the manipulation portion  60  is released, adjustment of the height of the upper plate  20  may be stopped even when the upper plate  20  is being moved. In this manner, the height of the upper plate  20  may be diversely varied. 
     For example, when the upper plate  20  is moved downward, the length of the gas spring  41  may be shortened, and the second movement portion  170  may slide along the second movement frame  160  in a backward direction with reference to  FIG. 9 . In addition, upper end portions of the first and second connecting members  31  and  32  are moved downward such that the angles of the first and second connecting members  31  and  32  may decrease with respect to the main body  11 . 
     Conversely, when the upper plate  20  is moved upward, the manipulation portion  60  may be pushed to increase the length of the gas spring  41 , and the second movement portion  170  may slide forward along the second movement frame  160 . In addition, the upper end portions of the first and second connecting members  31  and  32  are moved upward such that the angles of the first and second connecting members  31  and  32  may increase with respect to the main body  11 . 
       FIG. 10  is a perspective view illustrating a sink according to a third embodiment of the present disclosure,  FIG. 11  is a front view illustrating the sink of the third embodiment of the present disclosure, and  FIG. 12  is a side view illustrating the sink of the third embodiment of the present disclosure. 
     The current embodiment is the same as the second embodiment except for the configuration of a connecting member  30 . Therefore, in the following description, only characteristic parts of the current embodiment will be described, and descriptions of the same parts as those in the second embodiment will be substituted with previous descriptions. 
     In the current embodiment, an extension portion  33  may provided on a main body  11 , and connecting members  31  and  32  may be connected to the extension portion  33 . That is, in the second embodiment, the extension portion  33  is provided on the upper plate  20 . In the current embodiment, however, the extension portion  33  may be provided on the main body  11 . 
     Furthermore, in the current embodiment, a holding unit  40  is spaced apart from a lower side of an upper plate  20  in parallel with the upper plate  20 . That is, a side of the holding unit  40  may be coupled to one of the first and second connecting members  31  and  32 , and the other side of the holding unit  40  may be coupled to the other of the first and second connecting members  31  and  32 . One and the other sides of the connecting member  30  may be coupled at the same height. 
     In the current embodiment, the first and second connecting members  31  and  32  may be provided inside a shield wall  24 . Since the first connecting member  31 , the second connecting member  32 , and the holding unit  40  are provided inside the shield wall  24 , an accommodation space inside the main body  11  may be more usefully used. 
     The holding unit  40  may include a level coil spring. 
       FIG. 13  is a perspective view illustrating a sink according to a fourth embodiment of the present disclosure.  FIG. 13A  illustrates a state in which an upper plate is at a lowermost position, and  FIG. 13B  illustrates a state in which the upper plate is at an highest position.  FIG. 14  is a cross-sectional view illustrating a sink table according to the fourth embodiment of the present disclosure, and  FIG. 15  is a cut-away view illustrating a cooking table according to the fourth embodiment of the present disclosure. 
     The current embodiment is the same as the first embodiment except for the configuration of an upper plate  20 . Therefore, in the following description, only characteristic parts of the current embodiment will be described, and descriptions of the same parts as those in the first embodiment will be substituted with previous descriptions. 
     In the current embodiment, the sink table  200  and the cooking table  300  may be raised independently of each other. That is, unlike in the first embodiment in which the sink table  200  and cooking table  300  are raised together, the sink table  200  and the cooking table  300  may be raised independently of each other. 
     In the current embodiment, the upper plate  20  may include a penetration portion through which the sink table  200  or the cooking table  300  passes. That is, the sink table  200  or the cooking table  300  may be moved upward through the penetration portion. The penetration portion may have the same shape as the shape of the sink table  200  or the cooking table  300 . 
     The sink table  200  may include a lift surface portion  201  and a shield wall  202  that form the outer side of the sink table  200 . In the drawings, the lift surface portion  201  has a tetragonal shape. However, the lift surface portion  201  is not limited thereto. For example, the lift surface portion  201  may have a circular or polygonal shape. 
     If the sink table  200  is lowered to a minimum height, the lift surface portion  201  and the upper plate  20  are placed at the same height without a height difference. However, the lift surface portion  201  may have a size that is greater than the penetration portion of the upper plate  20  not to expose a gap between a main body  11  and the lift surface portion  201 , and in this case, a height difference corresponding to the thickness of the lift surface portion  201  may be between the upper plate  20  and the lift surface portion  201 . 
     A sink bowl  210  is provided in a center region of the lift surface portion  201 , and a faucet  230  may be provided in a rear region of the lift surface portion  201  such that water may fall from the faucet  230  to the sink bowl  210 . A drain hole  240  may be provided in a lowermost surface of the sink bowl  210 , and the lowermost surface of the sink bowl  210  may have, but is not limited to, a flat shape or a curved shape. 
     A manipulation portion  60  may be provided on a side of the lift surface portion  201  to operate a holding unit  40 . In addition, a handle  70  may be provided on the lift surface portion  201  at a position close to the manipulation portion  60 . 
     The shield wall  24  may prevent a gap between the lift surface portion  201  and the upper plate  20  from being exposed when the height of the lift surface portion  201  is increased. 
     When the sink table  200  is lowered to a minimum height, a lower surface of the lift surface portion  201  may be brought into contact with and supported by a main body frame  15 . 
     In addition, sides of two or more holding units  40  may be coupled to the lower surface of the lift surface portion  201 , and the other sides of the two or more holding units  40  may be coupled to the main body frame  15 . The two or more holding units  40  may be symmetrically arranged around the sink bowl  210 . 
     Like the sink table  200 , the cooking table  300  may be independently raised, and the cooking table  300  may include a lift surface portion  301  and a shield wall  302 . In the drawings, the cooking table  300  is illustrated as having a tetragonal shape. However, the cooking table  300  is not limited thereto. For example, the cooking table  300  may have a circular or polygonal shape. 
     The operations and configurations of the lift surface portion  301  and the shield wall  302  are the same as the operations and configurations of the lift surface portion  201  and the shield wall  202  except for detailed configurations for implementing the function of the cooking table  300 . 
     In the current embodiment, portions of the upper plate  20  that are adjustable in height are referred to as the lift surface portions  201  and  301 . However, the portions may be understood as lift plates separate from the upper plate  20 . 
       FIG. 16  is a cutaway view illustrating a sink table  200  according to a fifth embodiment of the present disclosure,  FIG. 17  is a perspective view illustrating a connecting member  30  of the sink table  200  according to the fifth embodiment of the present disclosure,  FIG. 18  is a cutaway view illustrating a cooking table  300  according to the fifth embodiment of the present disclosure, and  FIG. 19  is a perspective view illustrating a connecting member  30  of the cooking table  300  according to the fifth embodiment of the present disclosure. 
     In the current embodiment, the sink table  200  and the cooking table  300  have the same structure as in the second and fifth embodiments except for the configuration of a connecting member  30  and the arrangement of a holding unit  40 . Therefore, in the following description, only characteristic parts of the current embodiment will be described, and descriptions of the same parts as those in the second and fifth embodiments will be substituted with previous descriptions. 
     In the current embodiment, a connecting member  30  may include a first connecting member  31  and a second connecting member  32  like in the second embodiment. Although the first and second connecting members  31  and  32  of the second embodiment are arranged in a front-to-rear direction, the first and second connecting members  31  and  32  of the current embodiment may be arranged in a left-to-right direction. 
     The connecting member  30  may include the first connecting member  31  rotatably connected to the sink table  200  and the cooking table  300 , and the second connecting member  32  rotatably connected to a main body frame  15 . 
     The first and second connecting members  32  may cross each other inside a main body  11  and may thus approximately form an ‘X’ shape when viewed from a front side. 
     Furthermore, in the current embodiment, a plurality of connecting members  30  may connect the main body  11  to the sink table  200 , and the main body  11  to the cooking table  300 . That is, in the current embodiment, a plurality of first connecting members  31  and a plurality of second connecting members  32  may connect the main body  11  to the sink table  200 , and the main body  11  to the cooking table  300 . 
     In addition, although both ends of the holding unit  40  are connected to the connecting member  30  in the second embodiment, an end of the holding unit  40  may be coupled to a shaft  190  connecting the plurality of second connecting members  32 , and the other end of the holding unit  40  may be coupled to a lower surface of a sink bowl  210  or a lower surface of lift surface portions  201  and  301 . 
     In addition, a gas spring coupling portion  191  may be provided on the lower surface of the sink bowl  210  or the lift surface portions  201  and  301 , and the other end of the holding unit  40  may be coupled to the gas spring coupling portion  191 . 
       FIG. 20  is a perspective view illustrating a sink according to a sixth embodiment of the present disclosure. 
     The current embodiment is the same as the second to fourth embodiments except for the configuration of an upper plate  20 . Therefore, in the following description, only characteristic parts of the current embodiment will be described, and descriptions of the same parts as those in the second to fifth embodiments will be substituted with previous descriptions. 
     In the current embodiment, the upper plate  20  includes a fixed upper plate  28  and a movable upper plate  29 . The fixed upper plate  28  is fixed to a main body  11 , and the movable upper plate  29  is coupled to the main body  11  in a vertically movable manner. 
     In addition, the fixed upper plate  28  may further include a lift surface portion  201 . 
     The movable upper plate  29  may function as a cooking table  300  as described above. 
     As described above, the sink  10  is configured such that the height of the upper plate  20  may easily be adjusted by simply manipulating a manipulation portion  60 , and thus even tall users may conveniently use the sink  10  without having to bend down for washing dishes and cooking. 
     While the height-adjustable sinks have been described according to the first to sixth embodiments, those of ordinary skill in the art may properly combine the first to sixth embodiments without departing from the scope of the present disclosure. 
     INDUSTRIAL APPLICABILITY 
     The present disclosure relates to a sink including a height adjusting device for users having different heights to easily adjust the height of the sink.