SEAT CUSHION FOR CHAIR AND SEAT FOR CHAIR INCLUDING SAME

Abstract

 A seat cushion for a chair, according to the present invention, has a plurality of cushion grooves, which are deformed by the seat load of a user, formed in the center portion of the lower surface thereof, wherein the plurality of cushion grooves comprise a plurality of main cushion grooves spaced at equal intervals from each other and arranged in a plurality of rows in the front-back direction and left-right direction, and a plurality of sub-cushion grooves connecting each of the plurality of main cushion grooves and shaped in straight lines having a narrower width and a shallower depth than those of the main cushion grooves, thereby offering the advantage of improving seating comfort with a simple structure.

Description

[Technical Field]

[0001] The present disclosure relates to a seat cushion for a chair and a seat for a chair including the same, and more specifically, to a seat cushion for a chair, which has a plurality of cushion grooves deformed by a seat load of a user formed in a central portion of a lower surface thereof to improve a sitting feeling with a simple structure.

[Background Art]

[0002] Generally, a sponge applied to a seat for a chair generates a sitting feeling with only material characteristics and shape without a separate structure that improves the sitting feeling. When a sponge with a uniform thickness is applied to the seat for a chair, there is a problem that the user feels that a shape of a central portion of the sponge is relatively raised due to a structure of the human body when the user sits on the seat for a chair, thereby causing the user to feel uncomfortable.

[0003] To solve such a problem, when the shape of the central portion of the sponge is formed concavely, there is a problem that a shape of an exterior of the seat for a chair is easily deformed and its thickness is reduced, thereby lowering cushioning strength.

[0004] In addition, the cushioning strength of the seat for a chair can be controlled by adjusting the physical properties of the sponge, but there is a limit to controlling the optimal physical properties of the sponge for the optimal cushioning strength of the seat for a chair.

[0005] Korean Patent Registration No. 10-2073647 (2020.02.05.) (hereinafter referred to as "related art") discloses a "SEAT CUSHION FOR CHAIR" that is fastened to an upper portion of a seat frame for a chair to allow a user to sit comfortably.

[0006] The related art is composed of a memory foam, an elastic body, and a stopper spring. The memory foam forms an outer cushion. The elastic body is inserted into an accommodation portion formed at a lower portion of the memory foam, is formed of a softer elastic material than the memory foam, and has a plurality of fastening holes provided at both side portions to form an inner cushion. The stopper spring is fastened to the fastening holes of the elastic body, and outer springs are formed relatively large and long based on the center so that both sides of the seat cushion are higher than the center to support thighs when the user sits and prevent legs from spreading, thereby improving the sitting feeling of the user.

[0007] However, since, in the related art, the configuration for improving the sitting feeling is composed of the memory foam, the elastic body, and the stopper spring, there is a problem that an assembly time and a cost are increased due to a complicated structure.

[Technical Problem]

[0008] The present disclosure is directed to providing a seat cushion for a chair, which has a plurality of cushion grooves deformed by a seat load of a user formed in a central portion of a lower surface thereof, thereby improving a sitting feeling with a simple structure, and a seat for a chair including the same.

[0009] Objects of the present disclosure are not limited to the above-described objects, and other objects that are not mentioned will be able to be clearly understood by those skilled in the art from the following description.

[Technical Solution]

[0010] To achieve the above object, a seat cushion for a chair according to the present disclosure has a plurality of cushion grooves deformed a seat load of a user formed in a central portion of a lower surface thereof. The plurality of cushion grooves includes a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of main cushion grooves are disposed in a plurality of rows in a front-rear direction and left-right direction and are spaced an equal interval from each other. The plurality of sub-cushion grooves each connect one of the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a straight shape with narrower widths and smaller deep than the plurality of main cushion grooves.

[0011] Vertical thicknesses from upper ends of the plurality of main cushion grooves to an upper end of the seat cushion may range from 30 to 40 mm.

[0012] Depths of the plurality of main cushion grooves may be greater than half of the vertical thickness of the seat cushion.

[0013] The plurality of main cushion grooves and the plurality of sub-cushion grooves may be symmetrical in a left-right direction with respect to a central portion of the seat cushion in the left-right direction. The plurality of sub-cushion grooves may be disposed diagonally to be closer to the central portion of the seat cushion in the left-right direction forward.

[0014] The plurality of main cushion grooves may include a plurality of first main cushion grooves, a plurality of second main cushion grooves, and a plurality of third main cushion grooves. The plurality of first main cushion grooves may be disposed to be spaced apart from each other in the front-rear direction in the central portion of the seat cushion in the left-right direction. The plurality of second main cushion grooves may be spaced apart from the plurality of first main cushion grooves in a left direction. The plurality of second main cushion grooves may be disposed to be spaced apart from each other in the front-rear direction. The plurality of third main cushion grooves may be spaced apart from the plurality of first main cushion grooves in a right direction. The plurality of third main cushion grooves may be disposed to be spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves may include a plurality of first sub-cushion grooves and a plurality of second sub-cushion grooves. The plurality of first sub-cushion grooves may each connect one of the plurality of first main cushion grooves to one of the plurality of second main cushion grooves. The plurality of second sub-cushion grooves may each connect one of the plurality of first main cushion grooves to one of the plurality of third main cushion grooves.

[0015] The plurality of first sub-cushion grooves may be disposed diagonally. A front end of each of the plurality of first sub-cushion grooves may be connected to one of the plurality of first main cushion grooves. A rear end of the plurality of first sub-cushion grooves may be connected to one of the plurality of second main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of first sub-cushion grooves is connected. The plurality of second sub-cushion grooves may be disposed diagonally. A front end of each of the plurality of second sub-cushion grooves may be connected to one of the plurality of first main cushion grooves. A rear end of the plurality of second sub-cushion grooves may be connected to one of the plurality of second main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of second sub-cushion grooves is connected.

[0016] The plurality of main cushion grooves may further include a plurality of fourth main cushion grooves and a plurality of fifth main cushion grooves. The plurality of fourth main cushion grooves may be spaced apart from the plurality of second main cushion grooves in the left direction. The plurality of fourth main cushion grooves may be disposed to be spaced apart from each other in the front-rear direction. The plurality of fifth main cushion grooves may be spaced apart from the plurality of third main cushion grooves in the right direction. The plurality of fifth main cushion grooves may be disposed to be spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves may include a plurality of third sub-cushion grooves and a plurality of fourth sub-cushion grooves. The plurality of third sub-cushion grooves may each connect one of the plurality of second main cushion grooves to one of the plurality of fourth main cushion grooves. The plurality of fourth sub-cushion grooves may each connect one of the plurality of third main cushion grooves to one of the plurality of fifth main cushion grooves.

[0017] The plurality of third sub-cushion grooves may be disposed diagonally. A front end of each of the plurality of third sub-cushion grooves may be connected to one of the plurality of second main cushion grooves. A rear end of the plurality of third sub-cushion grooves may be connected to one of the plurality of fourth main cushion grooves disposed in a row immediately behind one of the plurality of second main cushion grooves to which a front end of each of the plurality of third sub-cushion grooves is connected. The plurality of fourth sub-cushion grooves may be disposed diagonally. A front end of each of the plurality of fourth sub-cushion grooves may be connected to one of the plurality of third main cushion grooves. A rear end of the plurality of fourth sub-cushion grooves may be connected to one of the plurality of fifth main cushion grooves disposed in a row immediately behind one of the plurality of third main cushion grooves to which a front end of each of the plurality of fourth sub-cushion grooves is connected.

[0018] The number of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves may be one less than the number of each of the plurality of first main cushion grooves, the plurality of second main cushion grooves, and the plurality of third main cushion grooves. Main cushion grooves disposed at foremost portions of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves may be disposed to be spaced apart from main cushion grooves disposed second from the front of each of the plurality of first main cushion grooves, the plurality of second main cushion grooves and the plurality of third main cushion, in the left-right direction.

[0019] The plurality of main cushion grooves may be formed as circular grooves.

[0020] The plurality of main cushion grooves may be formed as polygonal grooves.

[0021] An insertion groove may be formed in a lower surface of the seat cushion. A seat plate supporting the seat cushion may be inserted into the insertion groove. The plurality of cushion grooves may be formed in an upper surface of the insertion groove.

[0022] An edge groove may be formed in an edge of an upper surface of the insertion groove. An edge protrusion formed at an edge of an upper surface of the seat plate may be inserted into the edge groove. The plurality of cushion grooves may be formed inside the edge groove of the upper surface of the insertion groove.

[0023] To achieve the above object, a seat for a chair according to the present disclosure includes a seat cushion and a seat plate. A plurality of cushion grooves deformed by a seat load of a user are formed in a central portion of a lower surface of the seat cushion. The seat plate supports the seat cushion. The plurality of cushion grooves includes a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of main cushion grooves are disposed in a plurality of rows in a front-rear direction and left-right direction and are spaced apart from each other at equal intervals. The plurality of sub-cushion grooves each connect one of the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a straight shape with narrower widths and smaller deep than the plurality of main cushion grooves.

[0024] An insertion groove may be formed in a lower surface of the seat cushion. The seat plate may be inserted into the insertion groove. The plurality of cushion grooves may be formed in an upper surface of the insertion groove.

[0025] Detailed matters of other embodiments are included in a detailed description and accompanying drawings.

[Advantageous Effects]

[0026] Since the seat cushion for a chair according to the present disclosure has the plurality of cushion grooves deformed by the seat load of the user formed in the central portion of the lower surface thereof, the plurality of cushion grooves include a plurality of main cushion grooves and a plurality of sub-cushion grooves, and the plurality of sub-cushion grooves are formed to have narrower widths and smaller depths than the plurality of main cushion grooves, as the plurality of main cushion grooves and the plurality of sub-cushion grooves are deformed by the user's weight when the user is in a state of sitting on the seat for a chair, the entire shape of the seat cushion is not excessively deformed when the inner walls of the plurality of main cushion grooves and the inner walls of the plurality of sub-cushion grooves are tilted, thereby improving the sitting feeling, and it is possible to prevent the user from feeling that the part of the seat, which is in direct contact with the user, collapses through the difference in vertical depths between the plurality of main cushion grooves and the plurality of sub-cushion grooves, thereby improving the sitting feeling over the entire area of the seat.

[0027] Effects of the present disclosure are not limited to the above-described effects, and other effects that are not mentioned will be able to be clearly understood by those skilled in the art from the following description.

[Description of Drawings]

[0028] 

FIG. 1 is a perspective view illustrating a chair on which a seat cushion for a chair according to an embodiment of the present disclosure is installed.

FIG. 2 is a rear perspective view of FIG. 1.

FIG. 3 is an exploded perspective view illustrating a seat illustrated in FIGS. 1 and 2.

FIG. 4 is a perspective view illustrating a seat cushion for a chair according to the embodiment of the present disclosure.

FIG. 5 is a bottom perspective view of FIG. 4.

FIG. 6 is a bottom view of FIG. 4.

FIG. 7 is a cross-sectional view along line A-A in FIG. 6.

FIG. 8 is a cross-sectional view illustrating a vertical thickness of the seat cushion and depths of a plurality of main cushion grooves, which are illustrated in FIG. 5.

FIG. 9 is a cross-sectional view along line B-B in FIG. 6 and a view illustrating deformation of the seat cushion for a chair according to the embodiment of the present disclosure when a seat load of a user acts on a seat for a chair.

<Description of reference numerals>

[0029] 

1: chair, 11: first main cushion groove

12: second main cushion groove 13: third main cushion groove

14: fourth main cushion groove 15: fifth main cushion groove

21: first sub-cushion groove 22: second sub-cushion groove

23: third sub-cushion groove 24: fourth sub-cushion groove

30: insertion groove 35: edge groove

111: seat cushion 112: seat plate

112A: edge protrusion

[Mode for Invention]

[0030] Hereinafter, a seat cushion for a chair and a seat for a chair including the same according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. In the following description, terms related to top, down, front, rear, left, and right directions follow top, down, front, rear, left, and right directions illustrated in FIGS. 1 and 4 to 6.

[0031] FIG. 1 is a perspective view illustrating a chair on which a seat cushion for a chair according to an embodiment of the present disclosure is installed, FIG. 2 is a rear perspective view of FIG. 1, and FIG. 3 is an exploded perspective view illustrating a seat illustrated in FIGS. 1 and 2.

[0032] Referring to FIGS. 1 to 3, a chair 1 on which a seat cushion 111 for a chair according to an embodiment of the present disclosure is installed may include a chair main body 100, an adjustment device 200, a leg part 300, a backrest post 400, and armrest parts 510 and 520.

[0033] The chair main body 100 may include a seat 110, a backrest 120, and a headrest 130. The seat 110, the backrest 120, and the headrest 130 may be formed in a substantially quadrangular shape.

[0034] The seat 110 may extend in a front-rear direction. The seat 110 may be a part on which a user sits. The seat 110 may support a user's buttocks and a thigh of each of two legs of the user.

[0035] A rear portion of an upper surface of the seat 110, which is a portion that supports the user's buttocks, may be formed to be slightly recessed downward, and a front portion thereof, which is a portion that supports the two thighs of the user, may be formed to be inclined to be close to a lower side as it goes forward.

[0036] The backrest 120 may extend vertically and extend so that a lower end portion is positioned in front of an upper end portion. The lower end portion of the backrest 120 may be hinge-coupled to the backrest post 400. Here, the hinge may include a horizontal axis that extends in a left-right direction. The backrest 120 may be formed of a separate structure separated from the seat 110.

[0037] The headrest 130 may extend vertically. The headrest 130 may be coupled to a front surface of the upper end portion of the backrest 120. The headrest 130 may be formed integrally with the backrest 120, and the headrest 130 may be coupled to the front surface of the upper end portion of the backrest 120 to rotate about the horizontal axis extending in the left-right direction.

[0038] The seat 110 may include the seat cushion 111 and a seat plate 112. The seat cushion 111 may be disposed above the seat plate 112. The seat cushion 111 may be formed of a material having cushion strength to provide a cushioning feeling to the user, and the seat plate 112 may be formed of a material harder than the seat cushion 111 to support the seat cushion 111.

[0039] The seat 110 may further include a fiber material cover (not illustrated). The fiber material cover may cover the seat cushion 111 and the seat plate 112 from an upper side of the seat cushion 111 so that a central portion of the fiber material cover may cover an upper surface of the seat cushion 111 and an edge portion of the fiber material cover may cover an edge portion of a lower surface of the seat plate 112.

[0040] The backrest 120 may be a part that supports the user's back. The backrest 120 may include a backrest cushion 121 and a backrest frame 122. The backrest cushion 121 may be disposed in front of the backrest frame 122. The backrest cushion 121 may be formed of a material having cushion strength to provide a cushioning feeling to the user, and the backrest frame 122 may be formed of a material harder than the backrest cushion 121 to support the backrest cushion 121.

[0041] The backrest frame 122 may include a backrest plate 123 and a lumbar 124.

[0042] The backrest plate 123 may support back and waist loads of the user. A flexible backrest connector 700 may be disposed on a rear surface of the backrest plate 123. The backrest connector 700 may connect the backrest plate 123 of the backrest frame 122 to a backrest slider (not illustrated) coupled to a front surface of an upper end portion of the backrest post 400 to slide vertically. The backrest connector 700 may be formed of a soft material that may be deformed by the user's load and may move the backrest frame 122 in a direction in which the user's load is applied.

[0043] When the user sits on the chair 1, a lower end portion of the backrest plate 123 may be disposed to face the user's waist. The lumbar 124 may be coupled to a rear surface of the lower end portion of the backrest plate 123 to support a load of the user's waist.

[0044] The headrest 130 may be a part that supports the user's head. The headrest 130 may include a headrest cushion 131 and a headrest plate 132. The headrest cushion 131 may be disposed in front of the headrest plate 132. The headrest cushion 131 may be formed of a material having cushion strength to provide a cushioning feeling to the user, and the headrest plate 132 may be formed of a material harder than the headrest cushion 131 to support the headrest cushion 131.

[0045] The seat cushion 111, the backrest cushion 121, and the headrest cushion 131 may be formed of the same material, and the seat plate 112, the backrest frame 122, and the headrest plate 132 may be formed of the same material. For example, the seat cushion 111, the backrest cushion 121, and the headrest cushion 131 may be formed of a sponge, and the seat plate 112, the backrest frame 122, and the headrest plate 132 may be formed of a plastic harder than the sponge.

[0046] The sponge may be a polyurethane foam sponge. Specifically, the sponge may be formed by stirring a main raw material, a foaming agent, a dispersant, a catalyst, and water and then foaming the mixture. Here, at least one of toluene-2.4-diisocyanate (TDI) and methylene dipara-phenylen isocyanate (MDI) may be used as the main raw material. In addition, the foaming agent may be an organic foaming agent such as a nitroalkane, an aldoxime, an activated ethylene compound, a water-containing compound, a cyclic compound, a tertiary alcohol, a 4-membered ring carbonyl compound, or the like, and an inorganic foaming agent such as CCl₂F, CCl₃F, a boric acid, an aluminum hydroxide, or the like. In addition, as the catalyst, dabco, stannic octiate, dibutyl dilauret, and a tertiary amine may be used.

[0047] The seat cushion 111 is not necessarily formed of a sponge and may be formed of a soft material similar to the sponge. That is, the seat cushion 111 may be formed of a soft material that may be deformed by the seat load of the user. For example, the seat cushion 111 may be formed of a latex, a memory foam, or the like.

[0048] The seat plate 112 and the headrest plate 132 may be formed to be slightly flexible and may be slightly deformed by the load of the user who sits on the chair 1.

[0049] In particular, the backrest plate 123 may be formed of an elastic body and elastically deformed by the user's load acting on the backrest 120, thereby improving the sitting feeling of the user who sits on the chair 1.

[0050] The adjustment device 200 may be disposed under the seat 110. The adjustment device 200 may be coupled to a lower side of the seat plate 112 of the seat 110. The adjustment device 200 may adjust a height of the chair main body 100 and may also adjust an angle of the backrest post 400 in the front-rear direction.

[0051] The adjustment device 200 may include two levers 210 and 220 manipulated by the user. Among the two levers 210 and 220, a first lever 210 may be a lever disposed to protrude at a right side of the adjustment device 200 to adjust the height of the chair main body 100 by the user's manipulation, and the second lever 220 may be a lever disposed to protrude at a left side of the adjustment device 200 to adjust an angle of the backrest post 400 in the front-rear direction by the user's manipulation.

[0052] A cylinder device 350 for adjusting the height of the chair main body 100 may be installed at the center of the leg part 300. The cylinder device 350 may be disposed vertically. The cylinder device 350 may include a cylinder and a piston rod. The cylinder may be inserted into a hole formed to vertically pass through the center of the leg part 300 and coupled to the center of the leg part 300, and the piston rod may be coupled to the cylinder to move vertically and rotate horizontally. An upper end of the piston rod may be coupled to the adjustment device 200. When the user sits on the seat 110 of the chair main body 100 and pulls the first lever 210 upward, the piston rod may be drawn out of the cylinder through the hole formed in the upper end of the cylinder and moved upward, thereby allowing the user to adjust the height of the chair main body 100.

[0053] The leg part 300 may be disposed under the adjustment device 200. The leg part 300 may support the adjustment device 200. The leg part 300 may include a plurality of leg main bodies 310 disposed radially. In the present embodiment, the plurality of leg main bodies 310 are formed as five leg main bodies, but may be formed as three or more leg main bodies. A wheel 320 may be rotatably coupled to an end of each of the plurality of leg main bodies 310.

[0054] The backrest post 400 may support the backrest 120. An upper portion of the backrest post 400 may extend vertically, and lower portion of the backrest post 400 may be bent forward from a lower end of the upper portion of the backrest post 400 and extended forward. An upper end of the backrest post 400 may be disposed under an upper end of the backrest 120. The upper end of the backrest post 400 may be disposed under an upper end of the backrest plate 123. A left-right width of the backrest post 400 may be formed to be narrower than a left-right width of the backrest 120. The left-right width of the backrest post 400 may be formed to be narrower than a left-right width of the backrest plate 123. The upper portion of the backrest post 400 may be disposed to face the center of the backrest 120 in the left-right direction of the rear surface of the backrest 120. The upper portion of the backrest post 400 may be disposed to face the center of the backrest plate 123 in the left-right direction of the rear surface of the backrest plate 123.

[0055] The armrest parts 510 and 520 may support left and right arms of the user. The armrest parts 510 and 520 may include a left armrest part 510 that supports the left arm of the user and a right armrest part 520 that supports the right arm of the user. The left armrest part 510 and the right armrest part 520 may be formed in the same structure.

[0056] The left armrest part 510 may include a left armrest post 511 and a left armrest 512.

[0057] An upper portion of the left armrest post 511 may extend vertically, and a lower portion of the left armrest post 511 may be bent to the right from a lower end of the upper portion of the left armrest post 511 and extended to the right. A lower end of the left armrest post 511 may be coupled to a left side of a lower end portion of the backrest post 400.

[0058] The left armrest 512 may be a portion that substantially supports the left arm of the user. A left pad, which is the uppermost component of the left armrest 512, may be in contact with the left arm of the user. The left armrest 512 may have a left rod coupled to a lower side of the left pad. The left rod may be inserted into the left armrest post 511 through a hole formed in an upper end of the left armrest post 511 to be drawn out of and inserted into the left armrest post 511 by the user's manipulation to adjust a height. In addition, the left pad may be formed so that a position in the front-rear direction is adjusted with respect to the left rod.

[0059] An upper portion of the right armrest post 521 may extend vertically, and a lower portion of the right armrest post 521 may be bent to the left from a lower end of the upper portion of the right armrest post 521 and extended to the left. A lower end of the right armrest post 521 may be coupled to a right side of the lower end portion of the backrest post 400.

[0060] The right armrest 522 may be a portion that substantially supports the right arm of the user. A right pad, which is the uppermost component of the right armrest 522, may be in contact with the right arm of the user. The right armrest 522 may have a right rod coupled to a lower side of the right pad. The right rod may be inserted into the right armrest post 521 through a hole formed in an upper end of the right armrest post 521 to be drawn out of and inserted into the right armrest post 521 by the user's manipulation to adjust a height. In addition, the right pad may be formed so that a position in the front-rear direction is adjusted with respect to the right rod.

[0061] FIG. 4 is a perspective view illustrating a seat cushion for a chair according to the embodiment of the present disclosure, FIG. 5 is a bottom perspective view of FIG. 4, FIG. 6 is a bottom view of FIG. 4, and FIG. 7 is a cross-sectional view along line A-A in FIG. 6.

[0062] Referring to FIGS. 3 to 7, a plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 deformed by the seat load of the user may be formed in a central portion of a lower surface of the seat cushion 111. The plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 may include a plurality of main cushion grooves 11, 12, 13, 14, and 15 and a plurality of sub-cushion grooves 21, 22, 23, and 24.

[0063] The plurality of main cushion grooves 11, 12, 13, 14, and 15 may be disposed in a plurality of rows in the front-rear direction and the left-right direction and may be spaced apart from each other at equal intervals. In the present embodiment, the plurality of main cushion grooves 11, 12, 13, 14, and 15 may be formed as circular grooves.

[0064] The plurality of sub-cushion grooves 21, 22, 23, and 24 may connect the plurality of main cushion grooves 11, 12, 13, 14, and 15. The plurality of sub-cushion grooves 21, 22, 23, and 24 may be formed in a straight shape with narrower widths and smaller depths than the plurality of main cushion grooves 11, 12, 13, 14, and 15. The plurality of sub-cushion grooves 21, 22, 23, and 24 may be disposed diagonally.

[0065] The plurality of main cushion grooves 11, 12, 13, 14, and 15 may be formed as circular grooves, and the plurality of sub-cushion grooves 21, 22, 23, and 24 may formed as straight grooves disposed diagonally so that a central portion of an upper surface of the seat cushion 111 may be pressed while an exterior of the seat cushion 111 is maintained.

[0066] However, the plurality of main cushion grooves 11, 12, 13, 14, and 15 are not necessarily formed as circular grooves. That is, the plurality of main cushion grooves 11, 12, 13, 14, and 15 may be formed as polygonal grooves such as triangular grooves, quadrangular grooves, pentagonal grooves, or hexagonal grooves as long as they are formed to have greater widths and greater depths than the plurality of sub-cushion grooves 21, 22, 23, and 24.

[0067] The plurality of main cushion grooves 11, 12, 13, 14, and 15 and the plurality of sub-cushion grooves 21, 22, 23, and 24 may be symmetrical in the left-right direction with respect to the center of the seat cushion 111 in the left-right direction. The plurality of sub-cushion grooves 21, 22, 23, and 24 may be disposed diagonally to be closer to the center of the seat cushion 111 in the left-right direction forward.

[0068] The plurality of main cushion grooves 11, 12, 13, 14, and 15 may include a plurality of first main cushion grooves 11, a plurality of second main cushion grooves 12, a plurality of third main cushion grooves 13, a plurality of fourth main cushion grooves 14, and a plurality of fifth main cushion grooves 15. However, the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may not be formed in the central portion of the lower surface of the seat cushion 111, and only the plurality of first main cushion grooves 11, the plurality of second main cushion grooves 12, and the plurality of third main cushion grooves 13 may be formed therein.

[0069] The plurality of first main cushion grooves 11, the plurality of second main cushion grooves 12, and the plurality of third main cushion grooves 13 may be formed in the same number. In the present embodiment, the number of each of the plurality of first main cushion grooves 11, the plurality of second main cushion grooves 12, and the plurality of third main cushion grooves 13 is five.

[0070] The number of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be the same. The number of each of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be one less than the number of each of the plurality of first main cushion grooves 11, the plurality of second main cushion grooves 12, and the plurality of third main cushion grooves 13. In the present embodiment, the number of each of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 is four.

[0071] Main cushion grooves disposed at foremost portions of each of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be disposed to be spaced apart from main cushion grooves disposed second from the front of each of the plurality of first main cushion grooves 11, the plurality of second main cushion grooves 12, and the plurality of third main cushion grooves 13, in the left-right direction.

[0072] The plurality of first main cushion grooves 11 may be disposed to be spaced apart from each other in the front-rear direction in the central portion of the seat cushion 111 in the left-right direction.

[0073] The plurality of second main cushion grooves 12 may be spaced apart from the plurality of first main cushion grooves 11 in a left direction. The plurality of second main cushion grooves 12 may be disposed to be spaced apart from each other in the front-rear direction.

[0074] The plurality of third main cushion grooves 13 may be spaced apart from the plurality of first main cushion grooves 11 in a right direction. The plurality of third main cushion grooves 13 may be disposed to be spaced apart from each other in the front-rear direction.

[0075] The plurality of fourth main cushion grooves 14 may be spaced apart from the plurality of second main cushion grooves 12 in the left direction. The plurality of fourth main cushion grooves 14 may be disposed to be spaced apart from each other in the front-rear direction.

[0076] The plurality of fifth main cushion grooves 15 may be spaced apart from the plurality of third main cushion grooves 13 in the right direction. The plurality of fifth main cushion grooves 15 may be disposed to be spaced apart from each other in the front-rear direction.

[0077] The plurality of sub-cushion grooves 21, 22, 23, and 24 may include a plurality of first sub-cushion grooves 21, a plurality of second sub-cushion grooves 22, a plurality of third sub-cushion grooves 23, and a plurality of fourth sub-cushion grooves 24. However, the plurality of third sub-cushion grooves 23 and the plurality of fourth sub-cushion grooves 24 may not be formed in the central portion of the lower surface of the seat cushion 111, and only the plurality of first sub-cushion grooves 21 and the plurality of second sub-cushion grooves 22 may be formed therein.

[0078] The plurality of first sub-cushion grooves 21 may each connect one of the plurality of first main cushion grooves 11 to one of the plurality of second main cushion grooves 12. The plurality of first sub-cushion grooves 21 may be disposed diagonally between the plurality of first main cushion grooves 11 and the plurality of second main cushion grooves 12.

[0079] The plurality of second sub-cushion grooves 22 may each connect one of the plurality of first main cushion grooves 11 to one of the plurality of third main cushion grooves 13. The plurality of second sub-cushion grooves 22 may be disposed diagonally between the plurality of first main cushion grooves 11 and the plurality of third main cushion grooves 13.

[0080] The plurality of third sub-cushion grooves 23 may connect the plurality of second main cushion grooves 12 to the plurality of fourth main cushion grooves 14. The plurality of third sub-cushion grooves 23 may be disposed diagonally between the plurality of second main cushion grooves 12 and the plurality of fourth main cushion grooves 14.

[0081] The plurality of fourth sub-cushion grooves 24 may connect the plurality of third main cushion grooves 13 to the plurality of fifth main cushion grooves 15. The plurality of fourth sub-cushion grooves 24 may be disposed diagonally between the plurality of third main cushion grooves 13 and the plurality of fifth main cushion grooves 15.

[0082] A front end of each of the plurality of first sub-cushion grooves 21 may be connected to one of the plurality of first main cushion grooves 11. A rear end of each of the plurality of first sub-cushion grooves 21 may be connected to one of the plurality of second main cushion grooves 12 disposed in a row immediately behind one of the plurality of first main cushion grooves 11 to which the front end of each of the plurality of first sub-cushion grooves 21 is connected.

[0083] A front end of each of the plurality of second sub-cushion grooves 22 may be connected to one of the plurality of first main cushion grooves 11. A rear end of each of the plurality of second sub-cushion grooves 22 may be connected to one of the plurality of third main cushion grooves 13 disposed in a row immediately behind one of the plurality of first main cushion grooves 11 to which the front end of each of the plurality of second sub-cushion grooves 22 is connected.

[0084] A front end of each of the plurality of third sub-cushion grooves 23 may be connected to one of the plurality of second main cushion grooves 12. A rear end of each of the plurality of third sub-cushion grooves 23 may be connected to one of the plurality of fourth main cushion grooves 14 disposed in a row immediately behind one of the plurality of second main cushion grooves 12 to which the front end of each of the plurality of third sub-cushion grooves 23 is connected.

[0085] A front end of each of the plurality of fourth sub-cushion grooves 24 may be connected to one of the plurality of third main cushion grooves 13. A rear end of each of the plurality of fourth sub-cushion grooves 24 may be connected to one of the plurality of fifth main cushion grooves 15 disposed in a row immediately behind one of the plurality of third main cushion grooves 13 to which the front end of each of the plurality of fourth sub-cushion grooves 24 is connected.

[0086] Meanwhile, an insertion groove 30 may be formed in the lower surface of the seat cushion 111. The seat plate 112 supporting the seat cushion 111 may be inserted into the insertion groove 30. The plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 may be formed in an upper surface of the insertion groove 30.

[0087] An edge groove 35 may be formed on an edge of the upper surface of the insertion groove 30. In this case, an edge protrusion 112A may be formed at an edge of the upper surface of the seat plate 112. The edge protrusion 112A formed on the edge of the upper surface of the seat plate 112 may be inserted into the edge groove 35. In this case, the plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 may be formed inside the edge groove 35 of the upper surfaces of the insertion groove 30.

[0088] However, the insertion groove 30 and the edge groove 35 are not necessarily formed in the lower surface of the seat cushion 111 and may not be formed therein.

[0089] FIG. 8 is a cross-sectional view illustrating a vertical thickness of the seat cushion and depths of a plurality of main cushion grooves, which are illustrated in FIG. 5.

[0090] Referring to FIG. 8, vertical thicknesses T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, and 15 to the upper end of the seat cushion 111 may range from 30 to 40 mm. When the vertical thicknesses T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, and 15 to the upper end of the seat cushion 111 are smaller than 30 mm, there may be a problem that the user feels boundaries of the plurality of main cushion grooves 11, 12, 13, 14, and 15 when sitting on the seat 110, and when the vertical thicknesses T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, and 15 to the upper end of the seat cushion 111 are greater than 40 mm, there may be a problem that the user may not feel an increase in cushioning strength due to the plurality of main cushion grooves 11, 12, 13, 14, and 15 when sitting on the seat 110.

[0091] Depths T2 of the plurality of main cushion grooves 11, 12, 13, 14, and 15 may be greater than half of the vertical thickness T of the seat cushion 111. In the present embodiment, since the vertical thickness T of the seat cushion 111 may be 63.86 mm and the depth T2 of each of the plurality of main cushion grooves 11, 12, 13, 14, and 15 may be 33.86 mm, the vertical thicknesses T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, and 15 to the upper end of the seat cushion 111 may be 30 mm. However, since the vertical thickness T of the seat cushion 111 may be changed to various thicknesses of 50 to 70 mm depending on the specifications of the chair, the depths T2 of the plurality of main cushion grooves 11, 12, 13, 14, and 15 are not necessarily formed to be greater than half of the vertical thickness T of the seat cushion 111 and may be changed to various depths within the range in which the vertical thicknesses T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, and 15 to the upper end of the seat cushion 111 ranges 30 to 40 mm.

[0092] FIG. 9 is a cross-sectional view along line B-B in FIG. 6 and a view illustrating deformation of the seat cushion for a chair according to the embodiment of the present disclosure when a seat load of a user acts on a seat for a chair. Here, the second sub-cushion groove 22 is described as an example, but deformation may occur in the main cushion grooves 11, 12, 13, 14, and 15 and the sub-cushion grooves 21, 22, 23, and 24 that are disposed under the seat cushion 111 on which the seat load of the user acts.

[0093] Referring to FIG. 9, when the seat load of the user acts on the upper side of the seat cushion 111 as indicated by the arrow, the lower portion of the seat cushion 111 is in a stationary state due to friction between the lower surface of the seat cushion 111 and the seat plate 112 and the upper portion of the seat cushion 111 is in a movable state in a direction of the seat load of the user, and at this time, the cushion groove (here, the second sub-cushion groove 22) formed in the lower surface of the seat cushion 111 may be deformed as indicated by the dashed line so that the user may feel soft.

[0094] In addition, the plurality of main cushion grooves 11, 12, 13, 14, and 15 may easily deform the central portion of the seat cushion 111 by the weight of the user who sits on the seat 110, and the plurality of sub-cushion grooves 21, 22, 23, and 24 may be deformed in a direction in which the user sits when pressed by the weight of the user who sits on the seat 110 so that inner walls of the plurality of sub-cushion grooves 21, 22, 23, and 24 tilt, and the inner walls tilt by the width of each of the plurality of sub-cushion grooves 21, 22, 23, and 24, and the deformation of the entire seat cushion 111 increases accordingly, thereby allowing the user to feel the improvement in sitting feeling. Since the deformation of the plurality of main cushion grooves 11, 12, 13, 14, and 15 and the plurality of sub-cushion grooves 21, 22, 23, and 24) occurs on the lower surface of the seat cushion 111, the exterior of the seat cushion 111 does not change, and thus the user may feel comfortable.

[0095] As described above, in the seat cushion 111 for a chair according to the embodiment of the present disclosure, since the plurality of sub-cushion grooves 21, 22, 23, and 24 are formed to have narrower widths and smaller depths than the plurality of main cushion grooves 11, 12, 13, 14, and 15, when the user sits on the seat 110 of the chair 1, the plurality of main cushion grooves 11, 12, 13, 14, and 15 and the plurality of sub-cushion grooves 21, 22, 23, and 24 are deformed by the weight of the user, and when the inner walls of the plurality of main cushion grooves 11, 12, 13, 14, and 15 and the inner walls of the plurality of sub-cushion grooves 21, 22, 23, and 24 are tilted, the overall shape of the seat cushion 111 is not excessively damaged, thereby improving the sitting feeling. In addition, through the difference in the vertical depths of the plurality of main cushion grooves 11, 12, 13, 14, and 15 and the plurality of sub-cushion grooves 21, 22, 23, and 24, it is possible to prevent the user from feeling that the part of the seat, which is in direct contact with the user, collapses, thereby improving the sitting feeling over the entire area of the seat 110.

[0096] Those skilled in the art to which the present disclosure pertains will be able to understand that the present disclosure can be carried out in other specific forms without changing the technical spirit or essential features thereof. Accordingly, it should be understood that the above-described embodiments are illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts thereof should be construed as being included in the scope of the present disclosure.

[Industrial applicability]

[0097] The present disclosure provides a seat cushion for a chair, which has a plurality of cushion grooves deformed by a seat load of a user formed in a central portion of a lower surface thereof, thereby improving a seating feeling with a simple structure, and a seat for a chair including the same.

Claims

1. A seat cushion for a chair, which has a plurality of cushion grooves deformed a seat load of a user formed in a central portion of a lower surface thereof,
wherein the plurality of cushion grooves include:

a plurality of main cushion grooves disposed in a plurality of rows in a front-rear direction and a left-right direction and spaced an equal interval from each other; and

a plurality of sub-cushion grooves each connecting one of the plurality of main cushion grooves and formed in a straight shape with narrower widths and smaller depths than the plurality of main cushion grooves.

2. The seat cushion of claim 1, wherein vertical thicknesses from upper ends of the plurality of main cushion grooves to an upper end of the seat cushion ranges from 30 to 40 mm.

3. The seat cushion of claim 2, wherein depths of the plurality of main cushion grooves is greater than half of the vertical thickness of the seat cushion.

4. The seat cushion of claim 1, wherein the plurality of main cushion grooves and the plurality of sub-cushion grooves are symmetrical in a left-right direction with respect to a central portion of the seat cushion in the left-right direction, and
the plurality of sub-cushion grooves are disposed diagonally to be closer to the central portion of the seat cushion in the left-right direction forward.

5. The seat cushion of claim 4, wherein the plurality of main cushion grooves include:

a plurality of first main cushion grooves disposed to be spaced apart from each other in the front-rear direction in the central portion of the seat cushion in the left-right direction;

a plurality of second main cushion grooves spaced apart from the plurality of first main cushion grooves in a left direction and disposed to be spaced apart from each other in the front-rear direction; and

a plurality of third main cushion grooves spaced apart from the plurality of first main cushion grooves in a right direction and disposed to be spaced apart from each other in the front-rear direction, and

the plurality of sub-cushion grooves include:

a plurality of first sub-cushion grooves each connecting one of the plurality of first main cushion grooves to one of the plurality of second main cushion grooves; and

a plurality of second sub-cushion grooves each connecting one of the plurality of first main cushion grooves to one of the plurality of third main cushion grooves.

6. The seat cushion of claim 5, wherein the plurality of first sub-cushion grooves each has a front end connected to one of the plurality of first main cushion grooves and a rear end connected to one of the plurality of second main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of first sub-cushion grooves is connected and is disposed diagonally, and
the plurality of second sub-cushion grooves each has a front end connected to one of the plurality of first main cushion grooves and a rear end connected to one of the plurality of third main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of second sub-cushion grooves is connected and is disposed diagonally.

7. The seat cushion of claim 5, wherein the plurality of main cushion grooves further include:

a plurality of fourth main cushion grooves spaced apart from the plurality of second main cushion grooves in the left direction and disposed to be spaced apart from each other in the front-rear direction; and

a plurality of fifth main cushion grooves spaced apart from the plurality of third main cushion grooves in the right direction and disposed to be spaced apart from each other in the front-rear direction, and

the plurality of sub-cushion grooves further include:

a plurality of third sub-cushion grooves each connecting one of the plurality of second main cushion grooves to one of the plurality of fourth main cushion grooves; and

a plurality of fourth sub-cushion grooves each connecting one of the plurality of third main cushion grooves to one of the plurality of fifth main cushion grooves.

8. The seat cushion of claim 7, wherein the plurality of first sub-cushion grooves each has a front end connected to one of the plurality of first main cushion grooves and a rear end connected to one of the plurality of second main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of first sub-cushion grooves is connected and is disposed diagonally,

the plurality of second sub-cushion grooves each has a front end connected to one of the plurality of first main cushion grooves and a rear end connected to one of the plurality of third main cushion grooves disposed in a row immediately behind one of the plurality of first main cushion grooves to which a front end of each of the plurality of second sub-cushion grooves is connected and is disposed diagonally,

the plurality of third sub-cushion grooves each has a front end connected to one of the plurality of second main cushion grooves and a rear end connected to one of the plurality of fourth main cushion grooves disposed in a row immediately behind one of the plurality of second main cushion grooves to which a front end of each of the plurality of third sub-cushion grooves is connected and is disposed diagonally, and

the plurality of fourth sub-cushion grooves each has a front end connected to one of the plurality of third main cushion grooves and a rear end connected to one of the plurality of fifth main cushion grooves disposed in a row immediately behind one of the plurality of third main cushion grooves to which a front end of each of the plurality of fourth sub-cushion grooves is connected and is disposed diagonally.

9. The seat cushion of claim 7, wherein the number of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves is one less than the number of each of the plurality of first main cushion grooves, the plurality of second main cushion grooves, and the plurality of third main cushion grooves, and
main cushion grooves disposed at foremost portions of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves are disposed to be spaced apart from main cushion grooves disposed second from the front of each of the plurality of first main cushion grooves, the plurality of second main cushion grooves and the plurality of third main cushion, in the left-right direction.

10. The seat cushion of claim 1, wherein the plurality of main cushion grooves are formed as circular grooves.

11. The seat cushion of claim 1, wherein the plurality of main cushion grooves are formed as polygonal grooves.

12. The seat cushion of claim 1, wherein an insertion groove into which a seat plate supporting the seat cushion is inserted is formed in a lower surface of the seat cushion, and
the plurality of cushion grooves are formed in an upper surface of the insertion groove.

13. The seat cushion of claim 12, wherein an edge groove into which an edge protrusion formed at an edge of an upper surface of the seat plate is inserted is formed in an edge of the upper surface of the insertion groove, and
the plurality of cushion grooves are formed inside the edge groove of the upper surface of the insertion groove.

14. A seat for a chair, comprising:

a seat cushion having a plurality of cushion grooves deformed a seat load of a user formed in a central portion of a lower surface thereof; and

a seat plate supporting the seat cushion,

wherein the plurality of cushion grooves include:

a plurality of main cushion grooves disposed in a plurality of rows in a front-rear direction and a left-right direction; and

a plurality of sub-cushion grooves each connecting one of the plurality of main cushion grooves and formed in a straight shape with narrower widths and smaller depths than the plurality of main cushion grooves.

15. The seat of claim 14, wherein an insertion groove into which the seat plate is inserted is formed in a lower surface of the seat cushion, and
the plurality of cushion grooves are formed in an upper surface of the insertion groove.

Drawing