Seat cushion for a chair and seat for a chair including the same

Abstract

The seat cushion for a chair according to the present invention has a plurality of cushion grooves formed in the central portion of the lower surface and deformed by the seating load of the user. The plurality of cushion grooves are arranged in a plurality of rows in the front-rear direction and the left-right direction, respectively, and include a plurality of main cushion grooves spaced apart from each other at equal intervals, and a plurality of sub-cushion grooves that connect the plurality of main cushion grooves and are formed in a linear shape with a width narrower and a depth not deeper than that of the plurality of main cushion grooves. Thus, it has the advantage of improving the seating feeling with a simple structure.

Description

Technical Field

[0001] The present invention relates to a seat cushion for a chair and a seat for a chair including the same, and more particularly, to a seat cushion for a chair having a plurality of cushion grooves formed in the central portion of the lower surface thereof and deformed by the seating load of a user, and having an improved seating feeling with a simple structure.

Background Art

[0002] Generally, the sponge applied to the seat of a chair generates a seating feeling only by the characteristics and form of the material without another structure for improving the seating feeling. When a sponge having a uniform thickness is applied to the seat of a chair, when a user sits on the seat of the chair, due to the structure of the human body, the shape of the central portion of the sponge is felt to be relatively swollen, and the user feels inconvenience.

[0003] In order to solve such a problem, when the shape of the central portion of the sponge is made concave, there is a problem that the external shape of the chair seat is easily deformed, the thickness is reduced, and the cushioning force is lowered.

[0004] Also, although the cushioning force of the chair seat can be adjusted by adjusting the physical property values of the sponge, there is a limit in adjusting the optimal physical property values of the sponge for the optimal cushioning force of the chair seat.

[0005] Korean Registered Patent Publication No. 10-2073647 (February 5, 2020) (hereinafter referred to as "the prior art") discloses a "seat cushion for a chair" that is fastened to the upper part of a seat frame for a chair so that a user can sit comfortably.

[0006] The prior art is composed of a memory foam, an elastic body, and a stopper spring. The memory foam forms an external cushion. The elastic body is inserted into a receiving portion formed at the lower part of the memory foam, and is made of an elastic material softer than the memory foam, with a plurality of fastening holes provided on both sides to form an internal cushion. The stopper spring is fastened to the fastening holes of the elastic body. When starting from the center, the size of the outer spring is relatively large and long, so that both sides of the seat plate cushion are higher than the center, and when the user sits down, the thighs are supported and the feet are prevented from spreading, thereby improving the user's sitting feeling.

[0007] However, since the configuration for improving the sitting feeling of the prior art is composed of the memory foam, the elastic body, and the stopper spring, there are problems of increased assembly time and cost due to the complex structure.

Summary of the Invention

Problems to be Solved by the Invention

[0008] The technical problem of the present invention is to provide a seat plate cushion for a chair and a seat plate for a chair that have a plurality of cushion grooves formed in the central part of the lower surface and deformed by the user's sitting load, and have a simple structure and improved sitting feeling.

[0009] The technical problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Means for Solving the Problems

[0010] In order to achieve the above object, a plurality of cushion grooves that deform under the seating load of the user are formed in the central portion of the lower surface of the seat cushion for a chair according to the present invention. The plurality of cushion grooves are composed of a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of main cushion grooves are arranged in a plurality of rows in the front-rear direction and the left-right direction, respectively, and are spaced apart from each other at equal intervals. The plurality of sub-cushion grooves connect the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a linear shape that is narrower in width and not deeper than the plurality of main cushion grooves.

[0011] The vertical thickness from the upper ends of the plurality of main cushion grooves to the upper end of the seat cushion may be formed to be 30 to 40 mm.

[0012] The depth of the plurality of main cushion grooves may be formed deeper 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 symmetric about the center in the left-right direction of the seat cushion. The plurality of sub-cushion grooves may be arranged obliquely closer to the center in the left-right direction of the seat cushion as going forward.

[0014] The plurality of main cushion grooves may be composed of 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 arranged at intervals in the front-rear direction at the center in the left-right direction of the seat plate cushion. The plurality of second main cushion grooves may be spaced apart from the plurality of first main cushion grooves to the left side. The plurality of second main cushion grooves may be arranged at intervals in the front-rear direction. The plurality of third main cushion grooves may be spaced apart from the plurality of first main cushion grooves to the right side. The plurality of third main cushion grooves may be arranged at intervals in the front-rear direction. The plurality of sub-cushion grooves may be composed of a plurality of first sub-cushion grooves and a plurality of second sub-cushion grooves. The plurality of first sub-cushion grooves can connect the plurality of first main cushion grooves and the plurality of second main cushion grooves respectively. The plurality of second sub-cushion grooves can connect the plurality of first main cushion grooves and the plurality of third main cushion grooves respectively.

[0015] The plurality of first sub-cushion grooves may be arranged diagonally. The front ends of the plurality of first sub-cushion grooves can be respectively connected to the plurality of first main cushion grooves. The rear ends of the plurality of first sub-cushion grooves can be respectively connected to the plurality of second main cushion grooves arranged in the row directly behind the plurality of first main cushion grooves to which the front ends of the plurality of first sub-cushion grooves are connected. The plurality of second sub-cushion grooves may be arranged diagonally. The front ends of the plurality of second sub-cushion grooves can be respectively connected to the plurality of first main cushion grooves. The rear ends of the plurality of second sub-cushion grooves can be respectively connected to the plurality of third main cushion grooves arranged in the row directly behind the plurality of first main cushion grooves to which the front ends of the plurality of second sub-cushion grooves are 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 to the left. The plurality of fourth main cushion grooves may be arranged 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 to the right. The plurality of fifth main cushion grooves may be arranged spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves may further include a plurality of third sub-cushion grooves and a plurality of fourth sub-cushion grooves. The plurality of third sub-cushion grooves can connect the plurality of second main cushion grooves and the plurality of fourth main cushion grooves respectively. The plurality of fourth sub-cushion grooves can connect the plurality of third main cushion grooves and the plurality of fifth main cushion grooves respectively.

[0017] The plurality of third sub-cushion grooves may be arranged diagonally. The front ends of the plurality of third sub-cushion grooves can be respectively connected to the plurality of second main cushion grooves. The rear ends of the plurality of third sub-cushion grooves can be respectively connected to the plurality of fourth main cushion grooves arranged in the row directly behind the plurality of second main cushion grooves to which the front ends of the plurality of third sub-cushion grooves are connected. The plurality of fourth sub-cushion grooves may be arranged diagonally. The front ends of the plurality of fourth sub-cushion grooves can be respectively connected to the plurality of third main cushion grooves. The rear ends of the plurality of fourth sub-cushion grooves can be respectively connected to the plurality of fifth main cushion grooves arranged in the row directly behind the plurality of third main cushion grooves to which the front ends of the plurality of fourth sub-cushion grooves are connected.

[0018] The number of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves may be formed to 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. Those arranged at the forefront of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves may be arranged at a distance in the left-right direction from those arranged second from the front among each of the plurality of first main cushion grooves, the plurality of second main cushion grooves, and the plurality of third main cushion grooves.

[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 on the lower surface of the seat plate cushion. A seat plate for supporting the seat plate cushion can be inserted into the insertion groove. The plurality of cushion grooves may be formed on the upper surface of the insertion groove.

[0022] A peripheral groove may be formed on the peripheral edge of the upper surface of the insertion groove. A peripheral protrusion formed on the peripheral edge of the upper surface of the seat plate can be inserted into the peripheral groove. The plurality of cushion grooves may be formed inside the peripheral groove on the upper surface of the insertion groove.

[0023] In order to achieve the above object, the seat plate for a chair according to the present invention is composed of a seat cushion and a seat plate. A plurality of cushion grooves that deform under the seating load of the user are formed at the center of the lower surface of the seat cushion. The seat plate supports the seat cushion. The plurality of cushion grooves are composed of a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of main cushion grooves are arranged in a plurality of rows in the front-rear direction and the left-right direction, respectively, and are spaced apart from each other at equal intervals. The plurality of sub-cushion grooves connect the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a linear shape that is narrower in width and not deeper than the plurality of main cushion grooves.

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

[0025] In addition, specific matters of the embodiments are included in the detailed description and the drawings.

Effect of the Invention

[0026] The seat cushion for a chair according to the present invention has a plurality of cushion grooves that deform under the seating load of the user formed at the center of the lower surface. The plurality of cushion grooves include a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of sub-cushion grooves are formed so as to be narrower in width and not deeper than the plurality of main cushion grooves. Therefore, when the user is sitting on the seat plate of the chair, while the plurality of main cushion grooves and the plurality of sub-cushion grooves are deforming under the weight of the user, when the inner walls of the plurality of main cushion grooves and the inner walls of the plurality of sub-cushion grooves are inclined, the overall shape of the seat cushion is not overly inhibited. Thus, the seating comfort can be improved. Due to the difference in the vertical depth between the plurality of main cushion grooves and the plurality of sub-cushion grooves, the user does not feel a sense of collapse in the part of the seat plate that directly touches the body, and there is an effect that the seating comfort over the entire area of the seat plate can be improved.

[0027] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0029] Hereinafter, a seat cushion for a chair according to an embodiment of the present invention and a seat plate for a chair including the same will be described with reference to the drawings. In the following description, terms related to the up-down, front-back, left-right directions are based on the up-down, front-back, left-right directions shown in FIGS. 1 and 4 to 6.

[0030] FIG. 1 is a perspective view showing a chair provided with a seat cushion for a chair according to an embodiment of the present invention, FIG. 2 is a rear perspective view of FIG. 1, and FIG. 3 is an exploded perspective view showing the seat plates shown in FIGS. 1 and 2.

[0031] Referring to FIGS. 1 to 3, the chair 1 provided with the seat cushion 111 for a chair according to an embodiment of the present invention can include a chair body 100, an adjustment device 200, legs 300, a backrest post 400, and armrests 510 and 520.

[0032] The chair body 100 can include a seat (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 rectangular shape.

[0033] The seat 110 can extend in the front-rear direction. The seat 110 can be a portion where the user sits. The seat 110 can support the user's buttocks and the thighs of both of the user's legs.

[0034] Among the upper surface of the seat 110, the rear portion that is the portion supporting the user's buttocks may be formed to be slightly recessed downward, and the front portion that is the portion supporting both of the user's thighs may be formed to be inclined so as to approach downward as it goes forward.

[0035] The backrest 120 can extend vertically and can extend such that the lower end portion is located in front of the upper end portion. The lower end portion of the backrest 120 can be hinged to the backrest post 400. Here, the hinge can include a horizontally long axis extending in the left-right direction. The backrest 120 may be formed as a separate structure separated from the seat 110.

[0036] The headrest 130 can extend vertically. The headrest 130 can be coupled to the front surface of the upper end portion of the backrest 120. The headrest 130 may be formed integrally with the backrest 120, and the lower end portion of the headrest 130 may be rotatably coupled to the front surface of the upper end portion of the backrest 120 with a horizontally long axis extending in the left-right direction as the rotation center.

[0037] The seat plate 110 can include a seat plate cushion 111 and a seat plate plate 112. The seat plate cushion 111 may be disposed above the seat plate plate 112. The seat plate cushion 111 is formed of a material having a cushioning force and can provide a cushioning feeling to the user, and the seat plate plate 112 is formed of a material harder than the seat plate cushion 111 and can support the seat plate cushion 111.

[0038] The seat plate 110 can further include a fiber material cover (not shown). The fiber material cover is covered from above the seat plate cushion 111 to the seat plate cushion 111 and the seat plate plate 112, and the central portion of the fiber material cover can cover the upper surface of the seat plate cushion 111, and the end portion of the fiber material cover can cover the lower surface end portion of the seat plate plate 112.

[0039] The back plate 120 can be a portion that supports the user's back. The back plate 120 can include a back plate cushion 121 and a back plate frame 122. The back plate cushion 121 may be disposed in front of the back plate frame 122. The back plate cushion 121 is formed of a material having a cushioning force and can provide a cushioning feeling to the user, and the back plate frame 122 is formed of a material harder than the back plate cushion 121 and can support the back plate cushion 121.

[0040] The back plate frame 122 can include a backrest plate 123 and a lumbar support 124.

[0041] The backrest plate 123 can support the load on the user's back and waist. A flexible material back plate connector 700 may be disposed on the rear surface of the backrest plate 123. The back plate connector 700 can connect the backrest plate 123 of the back plate frame 122 and a back plate slider (not shown) slidably coupled up and down to the front surface of the upper end of the back plate post 400. The back plate connector 700 is formed of a soft material deformable by the user's load and can move the back plate frame 122 in the direction in which the user's load acts.

[0042] When the user sits on the chair 1, the lower end of the backrest plate 123 may be disposed opposite to the waist of the user. The lumbar support 124 is coupled to the rear surface of the lower end of the backrest plate 123 and can support the load on the user's waist.

[0043] The headrest 130 may be a portion that supports the head of the user. 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 is formed of a material having a cushioning force and can provide a cushioning feeling to the user, and the headrest plate 132 is formed of a material harder than the headrest cushion 131 and can support the headrest cushion 131.

[0044] 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 sponge, and the seat plate 112, the backrest frame 122, and the headrest plate 132 may be formed of plastic harder than the sponge.

[0045] 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 performing foam molding. Here, at least one of TDI (Toluene-2,4-Diisocyanate) and MDI (Methylene Dipara-Phenylen Isocyanate) can be used as the main raw material. And as the foaming agent, organic foaming agents such as nitroalkane, aldoxime, active ethylene compound, scavenging compound, cyclic compound tertiary alcohol, 4-membered ring carbonyl compound, and inorganic foaming agents such as CCl2F, CCl3F, boric acid, aluminum hydroxide can be used. And as the catalyst, Dabco, stannous octoate, dibutyl dilaurate, tertiary amine can be used.

[0046] The seat plate cushion 111 does not necessarily have to be formed of sponge, and may be formed of a soft and fluffy material similar to the sponge. That is, the seat plate cushion 111 may be formed of a soft and fluffy material that can be deformed by the seating load of the user. For example, the seat plate cushion 111 may be formed of latex or memory foam or the like.

[0047] The seat plate 112 and the headrest plate 132 are formed to be slightly flexible and can be slightly deformed by the load of the user sitting on the chair 1.

[0048] In particular, the backrest plate 123 is formed of an elastic body and can be elastically deformed by the load of the user acting on the backrest 120, thereby improving the sitting feeling of the user sitting on the chair 1.

[0049] The adjusting device 200 may be disposed below the seat plate 110. The adjusting device 200 can be coupled to the lower side of the seat plate 112 of the seat plate 110. The adjusting device 200 can adjust the height of the chair body 100 and can also adjust the front-rear angle of the backrest post 400.

[0050] The adjustment device 200 can include two levers 210 and 220 that are operated by a user. Among the two levers 210 and 220, the first lever 210 may be protrudingly arranged on the right side of the adjustment device 200 and be a lever for adjusting the height of the chair body 100 by the operation of the user, and the second lever 220 may be protrudingly arranged on the left side of the adjustment device 200 and be a lever for adjusting the front-rear angle of the backrest post 400 by the operation of the user.

[0051] A cylinder device 350 for adjusting the height of the chair body 100 may be provided at the center of the leg portion 300. The cylinder device 350 may be vertically arranged. The cylinder device 350 can include a cylinder and a piston rod. The cylinder can be inserted into a hole formed vertically through the center of the leg portion 300 and can be coupled to the center of the leg portion 300, and the piston rod may be coupled to the cylinder so as to be movable up and down and rotatable in the horizontal direction. The upper end of the piston rod can be coupled to the adjustment device 200. When the user pulls the first lever 210 upward while sitting on the seat plate 110 of the chair body 100, the piston rod can move upward while being drawn out of the cylinder through a hole formed at the upper end of the cylinder, whereby the user can adjust the height of the chair body 100.

[0052] The leg portion 300 may be arranged below the adjustment device 200. The leg portion 300 can support the adjustment device 200. The leg portion 300 can include a plurality of leg bodies 310 arranged radially. In this embodiment, the plurality of leg bodies 310 are formed of five, but it is possible if three or more are formed. Wheels 320 can be rotatably coupled to the ends of each of the plurality of leg bodies 310.

[0053] The backrest post 400 can support the backrest 120. The upper part of the backrest post 400 can extend vertically in the up and down direction, and the lower part of the backrest post 400 can be bent forward from the lower end of the upper part of the backrest post 400 and extend forward. The upper end of the backrest post 400 may be disposed below the upper end of the backrest 120. The upper end of the backrest post 400 may be disposed below the upper end of the backrest plate 123. The left - right width of the backrest post 400 may be formed narrower than the left - right width of the backrest 120. The left - right width of the backrest post 400 may be formed narrower than the left - right width of the backrest plate 123. The upper part of the backrest post 400 may be disposed opposite to the center in the left - right direction of the rear surface of the backrest 120. The upper part of the backrest post 400 may be disposed opposite to the center in the left - right direction of the rear surface of the backrest plate 123.

[0054] The armrests 510 and 520 can support the user's left and right arms. The armrests 510 and 520 can include a left armrest 510 that supports the user's left arm and a right armrest 520 that supports the user's right arm. The left armrest 510 and the right armrest 520 may be formed with the same structure.

[0055] The left armrest 510 can include a left armrest post 511 and a left armrest 512.

[0056] The upper part of the left armrest post 511 can extend vertically, and the lower part of the left armrest post 511 can be bent to the right from the lower end of the upper part of the left armrest post 511 and extend to the right. The lower end of the left armrest post 511 can be coupled to the left side of the lower end portion of the backrest post 400.

[0057] The left elbow rest 512 can be a part that substantially supports the user's left arm. The left pad, which is the uppermost component of the left elbow rest 512, can be in contact with the user's left arm. The left elbow rest 512 can have a left rod coupled to the lower side of the left pad. The left rod is inserted into the inside of the left elbow rest post 511 through a hole formed at the upper end of the left elbow rest post 511, and can be pulled out or inserted within the left elbow rest post 511 by the user's operation, so that the height can be adjusted. Also, the left pad may be configured such that its front-rear position is adjustable with respect to the left rod.

[0058] The upper part of the right elbow rest post 521 can extend vertically, and the lower part of the right elbow rest post 521 can be bent leftward from the lower end of the upper part of the right elbow rest post 521 and extend leftward. The lower end of the right elbow rest post 521 can be coupled to the right side of the lower end part of the back plate post 400.

[0059] The right elbow rest 522 can be a part that substantially supports the user's right arm. The right pad, which is the uppermost component of the right elbow rest 522, can be in contact with the user's right arm. The right elbow rest 522 can have a right rod coupled to the lower side of the right pad. The right rod is inserted into the inside of the right elbow rest post 521 through a hole formed at the upper end of the right elbow rest post 521, and can be pulled out or inserted within the right elbow rest post 521 by the user's operation, so that the height can be adjusted. Also, the right pad may be configured such that its front-rear position is adjustable with respect to the right rod.

[0060] FIG. 4 is a perspective view showing a seat cushion for a chair according to an embodiment of the present invention, 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 taken along line A-A of FIG. 6.

[0061] Referring to FIGS. 3 to 7, a plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, 24 that deform under the seating load of the user may be formed at the central portion of the lower surface of the seat plate cushion 111. The plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, 24 may include a plurality of main cushion grooves 11, 12, 13, 14, 15 and a plurality of sub-cushion grooves 21, 22, 23, 24.

[0062] The plurality of main cushion grooves 11, 12, 13, 14, 15 are arranged in a plurality of rows in the front-rear direction and the left-right direction, respectively, and can be spaced apart from each other at equal intervals. In this embodiment, the plurality of main cushion grooves 11, 12, 13, 14, 15 may be formed as circular grooves.

[0063] The plurality of sub-cushion grooves 21, 22, 23, 24 can connect the plurality of main cushion grooves 11, 12, 13, 14, 15, respectively. The plurality of sub-cushion grooves 21, 22, 23, 24 may be formed in a linear shape that is narrower in width and not deeper than the plurality of main cushion grooves 11, 12, 13, 14, 15. The plurality of sub-cushion grooves 21, 22, 23, 24 may be arranged diagonally.

[0064] The plurality of main cushion grooves 11, 12, 13, 14, 15 are formed as circular grooves, and the plurality of sub-cushion grooves 21, 22, 23, 24 are formed as linear grooves arranged diagonally, enabling the pressing of the central portion of the upper surface of the seat plate cushion 111 while maintaining the outer shape of the seat plate cushion 111.

[0065] However, the plurality of main cushion grooves 11, 12, 13, 14, 15 do not necessarily have to be formed as circular grooves. That is, as long as the plurality of main cushion grooves 11, 12, 13, 14, 15 are formed wider and deeper than the plurality of sub-cushion grooves 21, 22, 23, 24, they may be formed as polygonal grooves such as triangular grooves, quadrilateral grooves, pentagonal grooves, hexagonal grooves, etc.

[0066] The plurality of main cushion grooves 11, 12, 13, 14, 15 and the plurality of sub-cushion grooves 21, 22, 23, 24 may be symmetric about the left-right center of the seat plate cushion 111. The plurality of sub-cushion grooves 21, 22, 23, 24 may be arranged obliquely closer to the left-right center of the seat plate cushion 111 as going forward.

[0067] The plurality of main cushion grooves 11, 12, 13, 14, 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, in the central part of the lower surface of the seat plate cushion 111, the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may not be formed, 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.

[0068] 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 as each other. In this 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 formed as 5.

[0069] The number of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be formed in the same number as each other. The number of each of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be formed by a number 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 this embodiment, the number of each of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 is formed as 4.

[0070] Those arranged at the foremost positions of the plurality of fourth main cushion grooves 14 and the plurality of fifth main cushion grooves 15 may be arranged at a distance from each other in the left-right direction from those arranged second from the front in front 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, respectively.

[0071] The plurality of first main cushion grooves 11 may be arranged at intervals from each other in the front-rear direction at the center in the left-right direction of the seat plate cushion 111.

[0072] The plurality of second main cushion grooves 12 can be separated from the plurality of first main cushion grooves 11 to the left. The plurality of second main cushion grooves 12 may be arranged at intervals from each other in the front-rear direction.

[0073] The plurality of third main cushion grooves 13 can be separated from the plurality of first main cushion grooves 11 to the right. The plurality of third main cushion grooves 13 may be arranged at intervals from each other in the front-rear direction.

[0074] The plurality of fourth main cushion grooves 14 can be separated from the plurality of second main cushion grooves 12 to the left. The plurality of fourth main cushion grooves 14 may be arranged at intervals from each other in the front-rear direction.

[0075] The plurality of fifth main cushion grooves 15 can be separated from the plurality of third main cushion grooves 13 to the right. The plurality of fifth main cushion grooves 15 may be arranged at intervals from each other in the front-rear direction.

[0076] The plurality of sub-cushion grooves 21, 22, 23, 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 at the center of the lower surface of the seat plate cushion 111, and only the plurality of first sub-cushion grooves 21 and the plurality of second sub-cushion grooves 22 may be formed.

[0077] The plurality of first sub-cushion grooves 21 can connect the plurality of first main cushion grooves 11 and the plurality of second main cushion grooves 12 respectively. The plurality of first sub-cushion grooves 21 may be arranged obliquely between the plurality of first main cushion grooves 11 and the plurality of second main cushion grooves 12.

[0078] The plurality of second sub-cushion grooves 22 can connect the plurality of first main cushion grooves 11 and the plurality of third main cushion grooves 13 respectively. The plurality of second sub-cushion grooves 22 may be arranged obliquely between the plurality of first main cushion grooves 11 and the plurality of third main cushion grooves 13.

[0079] The plurality of third sub-cushion grooves 23 can connect the plurality of second main cushion grooves 12 and the plurality of fourth main cushion grooves 14 respectively. The plurality of third sub-cushion grooves 23 may be arranged obliquely between the plurality of second main cushion grooves 12 and the plurality of fourth main cushion grooves 14.

[0080] The plurality of fourth sub-cushion grooves 24 can connect the plurality of third main cushion grooves 13 and the plurality of fifth main cushion grooves 15 respectively. The plurality of fourth sub-cushion grooves 24 may be arranged obliquely between the plurality of third main cushion grooves 13 and the plurality of fifth main cushion grooves 15.

[0081] The front ends of the plurality of first sub-cushion grooves 21 can be respectively connected to the plurality of first main cushion grooves 11. The rear ends of the plurality of first sub-cushion grooves 21 can be respectively connected to the plurality of second main cushion grooves 12 arranged in the row immediately behind the plurality of first main cushion grooves 11 to which the front ends of the plurality of first sub-cushion grooves 21 are connected.

[0082] The front ends of the plurality of second sub-cushion grooves 22 can be respectively connected to the plurality of first main cushion grooves 11. The rear ends of the plurality of second sub-cushion grooves 22 can be respectively connected to the plurality of third main cushion grooves 13 arranged in a row directly behind the plurality of first main cushion grooves 11 to which the front ends of the plurality of second sub-cushion grooves 22 are connected.

[0083] The front ends of the plurality of third sub-cushion grooves 23 can be respectively connected to the plurality of second main cushion grooves 12. The rear ends of the plurality of third sub-cushion grooves 23 can be respectively connected to the plurality of fourth main cushion grooves 14 arranged in a row directly behind the plurality of second main cushion grooves 12 to which the front ends of the plurality of third sub-cushion grooves 23 are connected.

[0084] The front ends of the plurality of fourth sub-cushion grooves 24 can be respectively connected to the plurality of third main cushion grooves 13. The rear ends of the plurality of fourth sub-cushion grooves 24 can be respectively connected to the plurality of fifth main cushion grooves 15 arranged in a row directly behind the plurality of third main cushion grooves 13 to which the front ends of the plurality of fourth sub-cushion grooves 24 are connected.

[0085] On the other hand, an insertion groove 30 may be formed on the lower surface of the seat plate cushion 111. The seat plate 112 that supports the seat plate cushion 111 can be inserted into the insertion groove 30. The plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, 24 may be formed on the upper surface of the insertion groove 30.

[0086] A peripheral groove 35 may be formed on the peripheral edge of the upper surface of the insertion groove 30. In this case, a peripheral protrusion 112A may be formed on the peripheral edge of the upper surface of the seat plate 112. The peripheral protrusion 112A formed on the peripheral edge of the upper surface of the seat plate 112 can be inserted into the peripheral groove 35. In this case, the plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, 24 may be formed inside the peripheral groove 35 on the upper surface of the insertion groove 30.

[0087] However, the insertion groove 30 and the peripheral groove 35 do not necessarily have to be formed on the lower surface of the seat plate cushion 111, and may not be formed.

[0088] FIG. 8 is a cross-sectional view showing the vertical thickness of the seat plate cushion shown in FIG. 5 and the depths of a plurality of main cushion grooves.

[0089] Referring to FIG. 8, the vertical thickness T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, 15 to the upper end of the seat plate cushion 111 may be formed to be 30 to 40 mm. When the vertical thickness T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, 15 to the upper end of the seat plate cushion 111 is less than 30 mm, there is a problem that the boundaries of the plurality of main cushion grooves 11, 12, 13, 14, 15 can be felt when the user sits on the seat plate 110. When the vertical thickness T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, 15 to the upper end of the seat plate cushion 111 is greater than 40 mm, there may be a problem that the increase in the cushioning force due to the plurality of main cushion grooves 11, 12, 13, 14, 15 cannot be felt when the user sits on the seat plate 110.

[0090] The depth T2 of the plurality of main cushion grooves 11, 12, 13, 14, 15 may be formed deeper than half of the vertical thickness T of the seat plate cushion 111. In this embodiment, the vertical thickness T of the seat plate cushion 111 is formed to be 63.86 mm, the depth T2 of each of the plurality of main cushion grooves 11, 12, 13, 14, 15 is formed to be 33.86 mm, and the vertical thickness T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, 15 to the upper end of the seat plate cushion 111 may be formed to be 30 mm. However, since the vertical thickness T of the seat plate cushion 111 can be variously changed to 50 - 70 mm according to the specifications of the chair, the depth T2 of the plurality of main cushion grooves 11, 12, 13, 14, 15 does not necessarily have to be formed deeper than half of the vertical thickness T of the seat plate cushion 111, and can be variously changed within the range where the vertical thickness T1 from the upper ends of the plurality of main cushion grooves 11, 12, 13, 14, 15 to the upper end of the seat plate cushion 111 is formed to be 30 - 40 mm.

[0091] FIG. 9 is a sectional view taken along line B - B of FIG. 6 and shows the deformation of the seat plate cushion for a chair according to an embodiment of the present invention when a seating load of a user acts on the seat plate of the chair. Here, the second sub - cushion groove 22 will be described as an example, but deformation can occur in the main cushion grooves 11, 12, 13, 14, 15 and the sub - cushion grooves 21, 22, 23, 24 located below the portion of the seat plate cushion 111 where the seating load of the user acts.

[0092] Referring to FIG. 9, when a seating load of a user acts on the upper side of the seat plate cushion 111 as shown by the arrow, due to the friction between the lower surface of the seat plate cushion 111 and the seat plate 112, the lower part of the seat plate cushion 111 is in a stationary state, and the upper part of the seat plate cushion 111 is in a state where it can move in the direction of the seating load of the user. At this time, the cushion groove (here, the second sub - cushion groove 22) formed on the lower surface of the seat plate cushion 111 deforms as shown by the two - dot chain line, and can make the user feel a softness.

[0093] In addition, the plurality of main cushion grooves 11, 12, 13, 14, 15 can facilitate the deformation of the central portion of the seat cushion 111 due to the weight of the user sitting on the seat plate 110. When the plurality of sub-cushion grooves 21, 22, 23, 24 are pressed by the weight of the user sitting on the seat plate 110, while deforming in the direction in which the user sits, the inner walls of the plurality of sub-cushion grooves 21, 22, 23, 24 are inclined. However, the inner walls are inclined by the width of each of the plurality of sub-cushion grooves 21, 22, 23, 24, and accordingly, the overall deformation amount of the seat cushion 111 increases, and the user can experience an improvement in the sitting comfort. Since such deformation of the plurality of main cushion grooves 11, 12, 13, 14, 15 and the plurality of sub-cushion grooves 21, 22, 23, 24 occurs on the lower surface of the seat cushion 111, the external shape of the seat cushion 111 does not change, so the user can feel comfort.

[0094] As described above, in the seat cushion 111 for a chair according to the embodiment of the present invention, since the plurality of sub-cushion grooves 21, 22, 23, 24 are formed to be narrower in width and not deeper than the plurality of main cushion grooves 11, 12, 13, 14, 15, when the user is sitting on the seat plate 110 of the chair 1, while the plurality of main cushion grooves 11, 12, 13, 14, 15 and the plurality of sub-cushion grooves 21, 22, 23, 24 are deforming due to the weight of the user, when the inner walls of the plurality of main cushion grooves 11, 12, 13, 14, 15 and the inner walls of the plurality of sub-cushion grooves 21, 22, 23, 24 are inclined, the overall shape of the seat cushion 111 is not excessively inhibited, so the sitting comfort can be improved. In addition, due to the difference in the vertical depth between the plurality of main cushion grooves 11, 12, 13, 14, 15 and the plurality of sub-cushion grooves 21, 22, 23, 24, it is possible to prevent the user from feeling a sense of collapse in the portion of the seat plate 110 that directly touches the body, and thus improve the sitting comfort over the entire area of the seat plate 110.

[0095] Those with ordinary knowledge in the technical field to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea and essential features. Therefore, it must be understood that the embodiments described above are illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims described later rather than the above detailed description, and it must be construed that all changes or modified forms derived from the meaning and scope of the claims and the equivalent concept thereof are included in the scope of the present invention.

Industrial Applicability

[0096] The present invention provides a seat plate cushion for a chair, in which a plurality of cushion grooves that are deformed by the seating load of a user are formed in the central part of the lower surface, and the seating feeling is improved with a simple structure, and a seat plate for a chair including the same.

Explanation of Signs

[0097] 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: Peripheral groove 111: Seat plate cushion, 112: Seat plate 112A: Peripheral protrusion

Claims

1. In a seat plate cushion for a chair, in which a plurality of cushion grooves that are deformed by the seating load of a user are formed in the lower central portion, the plurality of cushion grooves include: a plurality of main cushion grooves that are arranged in a plurality of rows in the front-rear direction and the left-right direction, respectively, and are spaced apart from each other at equal intervals; and a plurality of sub-cushion grooves that connect the plurality of main cushion grooves respectively and are formed in a linear shape that is narrower in width and not deeper than the plurality of main cushion grooves. A seat plate cushion for a chair.

2. The vertical thickness from the upper ends of the plurality of main cushion grooves to the upper end of the seat plate cushion is formed to be 30 to 40 mm. The seat plate cushion for a chair according to Claim 1.

3. The depth of the plurality of main cushion grooves is formed deeper than half of the vertical thickness of the seat plate cushion. The seat plate cushion for a chair according to Claim 2.

4. The plurality of main cushion grooves and the plurality of sub-cushion grooves are symmetric about the center in the left-right direction of the seat plate cushion, and the plurality of sub-cushion grooves are arranged in a slant such that they are closer to the center in the left-right direction of the seat plate cushion as they go forward. The seat plate cushion for a chair according to Claim 1.

5. The plurality of main cushion grooves include: a plurality of first main cushion grooves that are arranged spaced apart from each other in the front-rear direction at the center in the left-right direction of the seat plate cushion; a plurality of second main cushion grooves that are spaced apart from the plurality of first main cushion grooves to the left and are arranged spaced apart from each other in the front-rear direction; and a plurality of third main cushion grooves that are spaced apart from the plurality of first main cushion grooves to the right and are arranged spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves include: a plurality of first sub-cushion grooves that connect the plurality of first main cushion grooves and the plurality of second main cushion grooves respectively; and a plurality of second sub-cushion grooves that connect the plurality of first main cushion grooves and the plurality of third main cushion grooves respectively. The seat plate cushion for a chair according to Claim 4.

6. The plurality of first sub-cushion grooves are respectively connected to the front ends of the plurality of first main cushion grooves, and the rear ends are respectively connected to the plurality of second main cushion grooves arranged in the row immediately behind the plurality of first main cushion grooves to which the front ends of the plurality of first sub-cushion grooves are connected, and are arranged in a slant. The front ends of the plurality of second sub-cushion grooves are respectively connected to the plurality of first main cushion grooves, and the rear ends are respectively connected to the plurality of third main cushion grooves arranged in a row directly behind the plurality of first main cushion grooves to which the front ends of the plurality of second sub-cushion grooves are connected, and are arranged diagonally. The seat cushion for a chair according to claim 5.

7. The plurality of main cushion grooves include a plurality of fourth main cushion grooves spaced apart from the plurality of second main cushion grooves to the left and 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 to the right and spaced apart from each other in the front-rear direction. The seat cushion for a chair according to claim 5 further includes The plurality of sub-cushion grooves include a plurality of third sub-cushion grooves respectively connecting the plurality of second main cushion grooves and the plurality of fourth main cushion grooves, and a plurality of fourth sub-cushion grooves respectively connecting the plurality of third main cushion grooves and the plurality of fifth main cushion grooves. The seat cushion for a chair according to claim 5.

8. The front ends of the plurality of first sub-cushion grooves are respectively connected to the plurality of first main cushion grooves, and the rear ends are respectively connected to the plurality of second main cushion grooves arranged in a row directly behind the plurality of first main cushion grooves to which the front ends of the plurality of first sub-cushion grooves are connected, and are arranged diagonally. The front ends of the plurality of second sub-cushion grooves are respectively connected to the plurality of first main cushion grooves, and the rear ends are respectively connected to the plurality of third main cushion grooves arranged in a row directly behind the plurality of first main cushion grooves to which the front ends of the plurality of second sub-cushion grooves are connected, and are arranged diagonally. The front ends of the plurality of third sub-cushion grooves are respectively connected to the plurality of second main cushion grooves, and the rear ends are respectively connected to the plurality of fourth main cushion grooves arranged in a row directly behind the plurality of second main cushion grooves to which the front ends of the plurality of third sub-cushion grooves are connected, and are arranged diagonally. The front ends of the plurality of fourth sub-cushion grooves are respectively connected to the plurality of third main cushion grooves, and the rear ends are respectively connected to the plurality of fifth main cushion grooves arranged in a row directly behind the plurality of third main cushion grooves to which the front ends of the plurality of fourth sub-cushion grooves are connected, and are arranged diagonally. The seat cushion for a chair according to claim 7.

9. The number of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves is formed by a number that 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. Those arranged at the foremost positions of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves are arranged at a distance from the second ones arranged from the front in the left-right direction among the plurality of first main cushion grooves, the plurality of second main cushion grooves, and the plurality of third main cushion grooves. The seat cushion for a chair according to claim 7.

10. The plurality of main cushion grooves are formed as circular grooves. The seat cushion for a chair according to claim 1.

11. The plurality of main cushion grooves are formed as polygonal grooves. The seat cushion for a chair according to claim 1.

12. An insertion groove into which a seat plate for supporting the seat cushion is inserted is formed on the lower surface of the seat cushion. The plurality of cushion grooves are formed on the upper surface of the insertion groove. The seat cushion for a chair according to claim 1.

13. A peripheral groove into which a peripheral protrusion formed on the upper surface periphery of the seat plate is inserted is formed on the upper surface periphery of the insertion groove. The plurality of cushion grooves are formed inside the peripheral groove on the upper surface of the insertion groove. The seat cushion for a chair according to claim 12.

14. A seat cushion having a plurality of cushion grooves formed in the central part of the lower surface that are deformed by the seating load of the user, A seat plate for supporting the seat cushion, and includes The plurality of cushion grooves are A plurality of main cushion grooves arranged in a plurality of rows in the front-rear direction and the left-right direction respectively, and spaced apart from each other at equal intervals, A seat for a chair including a plurality of sub-cushion grooves that connect the plurality of main cushion grooves respectively and are formed in a linear shape that is narrower in width and not deeper than the plurality of main cushion grooves.

15. An insertion groove into which the seat plate is inserted is formed on the lower surface of the seat cushion, The plurality of cushion grooves are formed on the upper surface of the insertion groove, and the seat plate for a chair according to claim 14.

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