Chair seat cushion and chair seat containing 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 in which a plurality of cushion grooves that deform due to the seating load of a user are formed in the central portion of the lower surface, and the seating feeling is improved 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 with 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 bulge relatively, 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 to 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 aforementioned prior art consists of memory foam, an elastic body, and a stopper spring. The memory foam forms the outer cushion. The elastic body is inserted into a housing formed at the bottom of the memory foam and forms the inner cushion, being made of a softer elastic material than the memory foam and having multiple fastening holes on both sides. The stopper spring is fastened to the fastening holes of the elastic body, and when the center is used as the starting point, the outer spring is formed to be relatively large and long, so that both sides of the seat cushion are higher than the center, thereby supporting the user's thighs when seated and preventing their legs from spreading, thereby improving the user's seating comfort.

[0007] However, the aforementioned conventional technology, whose configuration for improving seating comfort consists of the memory foam, the elastic body, and the stopper spring, had the problem of increased assembly time and cost due to its complex structure. [Overview of the project] [Problems that the invention aims to solve]

[0008] The technical problem of the present invention is to provide a chair seat cushion and a chair seat including the same, which have multiple cushion grooves formed in the center of the lower surface that deform under the user's seating load, thereby improving seating comfort with a simple structure.

[0009] The technical problems of the present invention are not limited to those 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 problem]

[0010] To achieve the above objectives, the lower central portion of the chair seat cushion according to the present invention is formed with a plurality of cushion grooves that deform under the user's seating load. The plurality of cushion grooves consist of a plurality of main cushion grooves and a plurality of sub-cushion grooves. The plurality of main cushion grooves are arranged in multiple rows in the front-to-back and left-to-right directions, and are spaced equally apart from each other. The plurality of sub-cushion grooves connect the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a straight shape, narrower in width and less in depth than the plurality of main cushion grooves.

[0011] The vertical thickness from the upper end of the multiple 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 to be deeper than half the vertical thickness of the seat cushion.

[0013] The plurality of main cushion grooves and the plurality of sub-cushion grooves may be symmetrical with respect to the left-right center of the seat cushion. The plurality of sub-cushion grooves may be arranged diagonally, becoming closer to the left-right center of the seat cushion as they move forward.

[0014] The plurality of main cushion grooves may consist 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 in the center of the seat cushion in the left-right direction, spaced apart from each other in the front-rear direction. The plurality of second main cushion grooves can be separated to the left from the plurality of first main cushion grooves. The plurality of second main cushion grooves may be arranged spaced apart from each other in the front-rear direction. The plurality of third main cushion grooves can be separated to the right from the plurality of first main cushion grooves. The plurality of third main cushion grooves may be arranged spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves may consist 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 in a diagonal line. The front ends of the plurality of first sub-cushion grooves can each be connected to the plurality of first main cushion grooves. The rear ends of the plurality of first sub-cushion grooves can each be connected to the plurality of second main cushion grooves, which are 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. The plurality of second sub-cushion grooves may be arranged in a diagonal line. The front ends of the plurality of second sub-cushion grooves can each be connected to the plurality of first main cushion grooves. The rear ends of the plurality of second sub-cushion grooves can each be connected to the plurality of third main cushion grooves, which are 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.

[0016] The plurality of main cushion grooves may further comprise a plurality of fourth main cushion grooves and a plurality of fifth main cushion grooves. The plurality of fourth main cushion grooves are detachable to the left from the plurality of second main cushion grooves. The plurality of fourth main cushion grooves may be spaced apart from each other in the front-rear direction. The plurality of fifth main cushion grooves are detachable to the right from the plurality of third main cushion grooves. The plurality of fifth main cushion grooves may be spaced apart from each other in the front-rear direction. The plurality of sub-cushion grooves may further comprise 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 in a diagonal line. The front ends of the plurality of third sub-cushion grooves can each be connected to the plurality of second main cushion grooves. The rear ends of the plurality of third sub-cushion grooves can each be connected to the plurality of fourth main cushion grooves, which are located 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. The plurality of fourth sub-cushion grooves may be arranged in a diagonal line. The front ends of the plurality of fourth sub-cushion grooves can each be connected to the plurality of third main cushion grooves. The rear ends of the plurality of fourth sub-cushion grooves can each be connected to the plurality of fifth main cushion grooves, which are located 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.

[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. The foremost of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves may be spaced apart in the left-right direction from the 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 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 cushion. A seat plate that supports the seat 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 upper periphery of the insertion groove. A peripheral projection formed on the upper periphery of the seat plate can be inserted into the peripheral groove. The plurality of cushion grooves may be formed on the upper surface of the insertion groove, inside the peripheral groove.

[0023] To achieve the above objectives, the chair seat according to the present invention is composed of a seat cushion and a seat plate. A plurality of cushion grooves are formed in the center of the lower surface of the seat cushion, which deform under the user's seating load. 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-to-back direction and the left-to-right direction, and are spaced equally apart from each other. The plurality of sub-cushion grooves connect the plurality of main cushion grooves. The plurality of sub-cushion grooves are formed in a straight shape, narrower in width and less in depth 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] Further details of the embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0026] The chair seat cushion according to the present invention has a plurality of cushion grooves formed in the center of its lower surface that deform under the user's seating load. 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 to be narrower in width and not deeper than the plurality of main cushion grooves. Therefore, when a user is sitting on the chair seat, the plurality of main cushion grooves and the plurality of sub-cushion grooves deform under the user's weight, and as the inner walls of the plurality of main cushion grooves and the plurality of sub-cushion grooves tilt, the overall shape of the seat cushion is not excessively obstructed, thereby improving the seating comfort. Furthermore, the difference in vertical depth between the plurality of main cushion grooves and the plurality of sub-cushion grooves prevents the user from feeling that the part of the seat that directly touches their body is collapsing, thereby improving the seating comfort across the entire surface area of ​​the seat.

[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] It is a perspective view showing a chair provided with a seat cushion for a chair according to an embodiment of the present invention. [Figure 2] It is a rear perspective view of FIG. 1. [Figure 3] It is an exploded perspective view showing the seat plates shown in FIGS. 1 and 2. [Figure 4] It is a perspective view showing a seat cushion for a chair according to an embodiment of the present invention. [Figure 5] It is a bottom perspective view of FIG. 4. [Figure 6] It is a bottom view of FIG. 4. [Figure 7] It is a sectional view taken along line A-A of FIG. 6. [Figure 8] It is a sectional view showing the vertical thickness of the seat cushion shown in FIG. 5 and the depths of a plurality of main cushion grooves. [Figure 9] It is a sectional view taken along line B-B of FIG. 6 and a view showing the deformation of the seat 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.

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 vertical, front-rear, and left-right directions are based on the vertical, front-rear, and 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 Figures 1 to 3, a chair 1 equipped with a chair seat cushion 111 according to an embodiment of the present invention may 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 may include a seat (110), a backrest 120, and a headrest 130. The seat 110, backrest 120, and headrest 130 may be formed in a substantially rectangular shape.

[0033] The seat plate 110 can extend forward and backward. The seat plate 110 may be the part on which the user sits. The seat plate 110 can support the user's buttocks and the user's thighs.

[0034] Of the upper surface of the seat plate 110, the rear portion, which supports the user's buttocks, may be formed with a slight indentation downwards, and the front portion, which supports the user's thighs, may be formed with a slope that approaches downwards as it goes towards the front.

[0035] The back plate 120 may extend vertically, with its lower end positioned forward of its upper end. The lower end of the back plate 120 can be hinged to the back plate post 400. Here, the hinge may include a horizontal axis that is long from side to side. The back plate 120 may be formed as a separate structure from the seat plate 110.

[0036] The headrest 130 can extend vertically. The headrest 130 can be attached to the front of the upper end of the backrest 120. The headrest 130 may be formed integrally with the backrest 120, or its lower end may be rotatably attached to the front of the upper end of the backrest 120 with a horizontal axis that is long from left to right as the center of rotation.

[0037] The seat board 110 may include a seat board cushion 111 and a seat board plate 112. The seat board cushion 111 may be positioned above the seat board plate 112. The seat board cushion 111 is made of a material that has cushioning properties to provide the user with a cushioned feel, and the seat board plate 112 is made of a material that is harder than the seat board cushion 111 to support the seat board cushion 111.

[0038] The seat board 110 may further include a fiber material cover (not shown). The fiber material cover is placed over the seat board cushion 111 and the seat board plate 112 from above the seat board cushion 111, with the central part of the fiber material cover covering the upper surface of the seat board cushion 111, and the ends of the fiber material cover covering the lower ends of the seat board plate 112.

[0039] The backrest 120 may be the 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 positioned in front of the backrest frame 122. The backrest cushion 121 may be made of a cushioning material to provide the user with a cushioned feel, and the backrest frame 122 may be made of a harder material than the backrest cushion 121 to support the backrest cushion 121.

[0040] The backrest frame 122 may 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 backrest connector 700 made of a flexible material may be positioned on the rear surface of the backrest plate 123. The backrest connector 700 can connect the backrest plate 123 of the backrest frame 122 to a backrest slider (not shown) which is slidably mounted vertically to the front of the upper end of the backrest post 400. The backrest connector 700 is made of a soft material that is deformable by the user's load and can move the backrest frame 122 in the direction in which the user's load acts.

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

[0043] The headrest 130 may be the part that supports the user's head. The headrest 130 may include a head cushion 131 and a head plate 132. The head cushion 131 may be positioned in front of the head plate 132. The head cushion 131 may be made of a cushioning material to provide the user with a cushioning sensation, and the head plate 132 may be made of a harder material than the head cushion 131 to support the head cushion 131.

[0044] The seat cushion 111, back cushion 121, and head cushion 131 may be made of the same material, and the seat plate 112, back frame 122, and head plate 132 may also be made of the same material. For example, the seat cushion 111, back cushion 121, and head cushion 131 may be made of sponge, and the seat plate 112, back frame 122, and head plate 132 may be made of a plastic that is harder than the sponge.

[0045] The sponge may be a polyurethane foam sponge. Specifically, the sponge may be formed by foam molding after stirring a main raw material, a foaming agent, a dispersant, a catalyst, and water. Here, the main raw material can be at least one of TDI (Toluene-2,4-Diisocyanate) and MDI (Methylene Dipara-Phenylen Isocyanate). The foaming agent can be an organic foaming agent such as a nitroalkane, aldoxime, active ethylene compound, capture compound, cyclic compound tertiary alcohol, or 4-membered carbonyl compound, or an inorganic foaming agent such as CCl2F, CCl3F, boric acid, or aluminum hydroxide. The catalyst can be Dabco, stanus octiate, dibutyl dilaurate, or a tertiary amine.

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

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

[0048] In particular, the backrest plate 123 is made of an elastic material and can be elastically deformed by the user's load acting on the backrest 120, thereby improving the seating comfort of the user sitting in the chair 1.

[0049] The adjustment device 200 may be located on the underside of the seat plate 110. The adjustment device 200 can be coupled to the underside of the seat plate 112 of the seat plate 110. The adjustment device 200 can adjust the height of the chair body 100 and also adjust the front-to-back angle of the backrest post 400.

[0050] The adjustment device 200 may include two levers 210 and 220 operated by the user. Of the two levers 210 and 220, the first lever 210 may be positioned protruding from the right side of the adjustment device 200 and be used by the user to adjust the height of the chair body 100, and the second lever 220 may be positioned protruding from the left side of the adjustment device 200 and be used by the user to adjust the front-to-back angle of the backrest post 400.

[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 positioned vertically. The cylinder device 350 may include a cylinder and a piston rod. The cylinder may be inserted into a hole formed vertically through the center of the leg portion 300 and be coupled to the center of the leg portion 300, and the piston rod may be coupled to the cylinder so as to be vertically movable and horizontally rotatable. The upper end of the piston rod can be coupled to an adjustment device 200. When a user sits on the seat plate 110 of the chair body 100 and pulls the first lever 210 upward, the piston rod is pulled out from inside the cylinder through a hole formed at the upper end of the cylinder and is able to move upward, thereby allowing the user to adjust the height of the chair body 100.

[0052] The legs 300 may be positioned below the adjustment device 200. The legs 300 can support the adjustment device 200. The legs 300 may include a plurality of radially arranged suspension bodies 310. In this embodiment, the suspension bodies 310 are formed of five, but they can be formed of three or more. Wheels 320 can be rotatably attached to the end of each of the suspension bodies 310.

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

[0055] The left armrest portion 510 may 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 upper end of the left armrest post 511 and extend to the right. The lower end of the left armrest post 511 can be connected to the left side of the lower end of the backrest post 400.

[0057] The left armrest 512 may be the portion that substantially supports the user's left arm. The left pad, which is the uppermost component of the left armrest 512, is capable of contacting the user's left arm. A left rod can be coupled to the lower side of the left pad of the left armrest 512. The left rod is inserted into the left armrest post 511 through a hole formed at the upper end of the left armrest post 511 and its height can be adjusted by pulling it out or inserting it into the left armrest post 511 through operation by the user. The left pad may also be configured to be adjustable in a front-to-back position relative to the left rod.

[0058] The upper part of the right armrest post 521 can extend vertically, and the lower part of the right armrest post 521 can be bent to the left from the lower upper end of the right armrest post 521 and extend to the left. The lower end of the right armrest post 521 can be connected to the right side of the lower end of the backrest post 400.

[0059] The right armrest 522 may be the portion that substantially supports the user's right arm. The right-side pad, which is the uppermost component of the right armrest 522, is capable of contacting the user's right arm. A right-side rod can be coupled to the lower side of the right-side pad of the right armrest 522. The right-side rod is inserted into the right armrest post 521 through a hole formed at the upper end of the right armrest post 521 and its height is adjustable by pulling it out or inserting it into the right armrest post 521 by the user's operation. The right-side pad may also be configured to be adjustable in a front-to-back position relative to the right-side rod.

[0060] Figure 4 is a perspective view showing a chair seat cushion according to an embodiment of the present invention, Figure 5 is a bottom perspective view of Figure 4, Figure 6 is a bottom view of Figure 4, and Figure 7 is a cross-sectional view of Figure 6 along line AA.

[0061] Referring to Figures 3 to 7, a plurality of cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 that deform under the user's seating load may be formed in the center of the 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.

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

[0063] Multiple sub-cushion grooves 21, 22, 23, 24 can connect to multiple main cushion grooves 11, 12, 13, 14, 15, respectively. Multiple sub-cushion grooves 21, 22, 23, 24 may be formed in a straight shape, narrower in width and less in depth than the multiple main cushion grooves 11, 12, 13, 14, 15. Multiple sub-cushion grooves 21, 22, 23, 24 may be arranged in a diagonal pattern.

[0064] Multiple main cushion grooves 11, 12, 13, 14, and 15 are formed as circular grooves, and multiple sub-cushion grooves 21, 22, 23, and 24 are formed as straight grooves arranged in a diagonal pattern, allowing the center of the upper surface of the seat cushion 111 to be pressed while maintaining the outer shape of the seat cushion 111.

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

[0066] The multiple main cushion grooves 11, 12, 13, 14, 15 and the multiple sub-cushion grooves 21, 22, 23, 24 may be symmetrical with respect to the left-right center of the seat cushion 111. The multiple sub-cushion grooves 21, 22, 23, 24 may be arranged diagonally, becoming closer to the left-right center of the seat cushion 111 as they move forward.

[0067] The multiple main cushion grooves 11, 12, 13, 14, 15 may include multiple first main cushion grooves 11, multiple second main cushion grooves 12, multiple third main cushion grooves 13, multiple fourth main cushion grooves 14, and multiple fifth main cushion grooves 15. However, the multiple fourth main cushion grooves 14 and the multiple fifth main cushion grooves 15 may not be formed in the central lower surface of the seat cushion 111, and only the multiple first main cushion grooves 11, multiple second main cushion grooves 12, and multiple third main cushion grooves 13 may be formed therein.

[0068] The multiple first main cushion grooves 11, the multiple second main cushion grooves 12, and the multiple third main cushion grooves 13 may be formed in the same number as each other. In this embodiment, the number of each of the multiple first main cushion grooves 11, the multiple second main cushion grooves 12, and the multiple third main cushion grooves 13 is formed in the number of 5.

[0069] The number of multiple fourth main cushion grooves 14 and multiple fifth main cushion grooves 15 may be the same as the number of each other. The number of each of the multiple fourth main cushion grooves 14 and multiple fifth main cushion grooves 15 may be one less than the number of each of the multiple first main cushion grooves 11, multiple second main cushion grooves 12, and multiple third main cushion grooves 13. In this embodiment, the number of each of the multiple fourth main cushion grooves 14 and multiple fifth main cushion grooves 15 is formed as four.

[0070] The components positioned at the very front of each of the multiple fourth main cushion grooves 14 and multiple fifth main cushion grooves 15 may be spaced apart in the left-right direction from the components positioned second from the front of each of the multiple first main cushion grooves 11, multiple second main cushion grooves 12, and multiple third main cushion grooves 13.

[0071] Multiple first main cushion grooves 11 may be arranged in the center of the seat cushion 111 in the left-right direction, spaced apart from each other in the front-back direction.

[0072] Multiple second main cushion grooves 12 are separable from multiple first main cushion grooves 11 to the left. Multiple second main cushion grooves 12 may be arranged to be separated from each other in the front-rear direction.

[0073] The multiple third main cushion grooves 13 are spaced apart to the right from the multiple first main cushion grooves 11. The multiple third main cushion grooves 13 may be spaced apart from each other in the front-rear direction.

[0074] The multiple fourth main cushion grooves 14 are spaced apart to the left from the multiple second main cushion grooves 12. The multiple fourth main cushion grooves 14 may be spaced apart from each other in the front-rear direction.

[0075] The multiple fifth main cushion grooves 15 are spaced apart to the right from the multiple third main cushion grooves 13. The multiple fifth main cushion grooves 15 may be spaced apart from each other in the front-rear direction.

[0076] The multiple sub-cushion grooves 21, 22, 23, and 24 may include multiple first sub-cushion grooves 21, multiple second sub-cushion grooves 22, multiple third sub-cushion grooves 23, and multiple fourth sub-cushion grooves 24. However, the lower central portion of the seat cushion 111 may not have multiple third sub-cushion grooves 23 and multiple fourth sub-cushion grooves 24, and only multiple first sub-cushion grooves 21 and multiple second sub-cushion grooves 22 may be formed there.

[0077] Multiple first sub-cushion grooves 21 can connect multiple first main cushion grooves 11 and multiple second main cushion grooves 12, respectively. Multiple first sub-cushion grooves 21 may be arranged diagonally between multiple first main cushion grooves 11 and multiple second main cushion grooves 12.

[0078] Multiple second sub-cushion grooves 22 can connect multiple first main cushion grooves 11 and multiple third main cushion grooves 13, respectively. Multiple second sub-cushion grooves 22 may be arranged diagonally between multiple first main cushion grooves 11 and multiple third main cushion grooves 13.

[0079] Multiple third sub-cushion grooves 23 can connect multiple second main cushion grooves 12 and multiple fourth main cushion grooves 14, respectively. Multiple third sub-cushion grooves 23 may be arranged diagonally between multiple second main cushion grooves 12 and multiple fourth main cushion grooves 14.

[0080] Multiple fourth sub-cushion grooves 24 can connect multiple third main cushion grooves 13 and multiple fifth main cushion grooves 15, respectively. Multiple fourth sub-cushion grooves 24 may be arranged diagonally between multiple third main cushion grooves 13 and multiple fifth main cushion grooves 15.

[0081] The front ends of the multiple first sub-cushion grooves 21 can each be connected to the multiple first main cushion grooves 11. The rear ends of the multiple first sub-cushion grooves 21 can each be connected to the multiple second main cushion grooves 12, which are located in a row directly behind the multiple first main cushion grooves 11 to which the front ends of the multiple first sub-cushion grooves 21 are connected.

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

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

[0084] The front ends of the multiple fourth sub-cushion grooves 24 can each be connected to the multiple third main cushion grooves 13. The rear ends of the multiple fourth sub-cushion grooves 24 can each be connected to the multiple fifth main cushion grooves 15, which are located in a row directly behind the multiple third main cushion grooves 13 to which the front ends of the multiple 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 cushion 111. The seat plate 112 that supports the seat cushion 111 can be inserted into the insertion groove 30. Multiple cushion grooves 11, 12, 13, 14, 15, 21, 22, 23, and 24 may be formed on the upper surface of the insertion groove 30.

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

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

[0088] Figure 8 is a cross-sectional view showing the vertical thickness of the seat cushion and the depth of the multiple main cushion grooves shown in Figure 5.

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

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

[0091] Figure 9 shows a cross-sectional view of line BB in Figure 6 and the deformation of a chair seat cushion according to an embodiment of the present invention when the user's seating load is applied to the chair seat. Here, the second sub-cushion groove 22 is explained as an example, but deformation can occur in the main cushion grooves 11, 12, 13, 14, 15 and sub-cushion grooves 21, 22, 23, 24 located below the part of the seat cushion 111 that is subjected to the user's seating load.

[0092] Referring to Figure 9, when the user's seating load is applied to the upper side of the seat cushion 111 as indicated by the arrow, the friction between the lower surface of the seat cushion 111 and the seat plate 112 causes the lower part of the seat cushion 111 to stop, while the upper part of the seat cushion 111 becomes movable in the direction of the user's seating load. At this time, the cushion groove (in this case, the second sub-cushion groove 22) formed on the lower surface of the seat cushion 111 deforms as shown by the dashed line, making the user feel plush.

[0093] Furthermore, the multiple main cushion grooves 11, 12, 13, 14, and 15 facilitate deformation of the central part of the seat cushion 111 by the weight of the user sitting on the seat 110, and when the multiple sub-cushion grooves 21, 22, 23, and 24 are pressed by the weight of the user sitting on the seat 110, they deform in the direction the user is sitting, and the inner walls of the multiple sub-cushion grooves 21, 22, 23, and 24 tilt, but the inner walls tilt by the width of each of the multiple sub-cushion grooves 21, 22, 23, and 24, and the amount of deformation of the entire seat cushion 111 increases by that amount, allowing the user to experience an improved seating comfort. Since the deformation of the multiple main cushion grooves 11, 12, 13, 14, and 15 and the multiple sub-cushion grooves 21, 22, 23, and 24 occurs on the underside of the seat cushion 111, the external shape of the seat cushion 111 does not change, so the user can feel at ease.

[0094] As described above, in the chair seat cushion 111 according to the embodiment of the present invention, the multiple sub-cushion grooves 21, 22, 23, 24 are formed to be narrower in width and not deeper in depth than the multiple main cushion grooves 11, 12, 13, 14, 15. Therefore, when a user sits on the seat 110 of the chair 1, the multiple main cushion grooves 11, 12, 13, 14, 15 and the multiple sub-cushion grooves 21, 22, 23, 24 deform under the user's weight, and the inner walls of the multiple main cushion grooves 11, 12, 13, 14, 15 and the inner walls of the multiple sub-cushion grooves 21, 22, 23, 24 tilt, but the overall shape of the seat cushion 111 is not excessively obstructed, thus improving the seating comfort. Furthermore, the difference in vertical depth between the multiple main cushion grooves 11, 12, 13, 14, 15 and the multiple sub-cushion grooves 21, 22, 23, 24 prevents the user from feeling like the seat plate 110 is collapsing in the part that directly contacts their body, thereby improving the overall seating comfort across the entire surface area of ​​the seat plate 110.

[0095] A person with ordinary skill in the art to which the present invention pertains will understand that the present invention can be carried out in other specific forms without altering its technical idea or essential features. Therefore, the embodiments described above should be understood to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, which are set forth below, and all modifications or alterations derived from the meaning and scope of the claims and the concept of equivalents thereto should be interpreted as being within the scope of the present invention. [Industrial applicability]

[0096] The present invention provides a chair seat cushion and a chair seat including the same, which have multiple cushion grooves formed in the center of the lower surface that deform under the user's seating load, thereby improving seating comfort with a simple structure. [Explanation of symbols]

[0097] 1: Chair, 11: First main cushion groove 12: Second main cushion groove, 13: Third main cushion groove 14: 4th main cushion groove, 15: 5th 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 cushion, 112: Seat plate 112A: Peripheral projection

Claims

1. In a chair seat cushion having multiple cushion grooves formed in the center of its lower surface that deform under the user's seating load, The aforementioned multiple cushion grooves are Multiple main cushion grooves are arranged in multiple rows in the front-to-back and left-to-right directions, and are spaced equally apart from each other. The plurality of main cushion grooves are connected to each other, and the plurality of sub-cushion grooves are formed in a straight shape that is narrower in width and less in depth than the plurality of main cushion grooves, The plurality of main cushion grooves and the plurality of sub-cushion grooves are symmetrical with respect to the left-right center of the seat cushion. The aforementioned multiple sub-cushion grooves are arranged in a diagonal pattern, becoming closer to the center of the seat cushion in the left-right direction as they move forward. Chair seat cushion.

2. The chair seat cushion according to claim 1, wherein the vertical thickness from the upper end of the plurality of main cushion grooves to the upper end of the seat cushion is formed to be 30 to 40 mm.

3. The chair seat cushion according to claim 2, wherein the depth of the plurality of main cushion grooves is formed to be deeper than half the vertical thickness of the seat cushion.

4. The aforementioned multiple main cushion grooves are Multiple first main cushion grooves are arranged in the center of the seat cushion in the left-right direction, spaced apart from each other in the front-rear direction, A plurality of second main cushion grooves are arranged to the left of the plurality of first main cushion grooves and separated from each other in the front-rear direction, It includes a plurality of third main cushion grooves that are spaced to the right of the plurality of first main cushion grooves and spaced apart from each other in the front-rear direction, The aforementioned multiple sub-cushion grooves are A plurality of first sub-cushion grooves connecting the plurality of first main cushion grooves and the plurality of second main cushion grooves, The chair seat cushion according to claim 1, further comprising a plurality of second sub-cushion grooves connecting the plurality of first main cushion grooves and the plurality of third main cushion grooves, respectively.

5. The plurality of first sub-cushion grooves are arranged in a diagonal pattern, with their front ends connected to the plurality of first main cushion grooves and their rear ends connected to the plurality of second main cushion grooves located 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. The chair seat cushion according to claim 4, wherein the plurality of second sub-cushion grooves are each connected at their front ends to the plurality of first main cushion grooves, and their rear ends are each connected to the plurality of third main cushion grooves, which are 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 in a diagonal pattern.

6. The aforementioned multiple main cushion grooves are A plurality of fourth main cushion grooves are arranged to the left of the plurality of second main cushion grooves and separated from each other in the front-rear direction, The present invention further includes a plurality of fifth main cushion grooves, which are spaced to the right of the plurality of third main cushion grooves and spaced apart from each other in the front-rear direction, The aforementioned multiple sub-cushion grooves are A plurality of third sub-cushion grooves connecting the plurality of second main cushion grooves and the plurality of fourth main cushion grooves, The chair seat cushion according to claim 4, further comprising a plurality of fourth sub-cushion grooves connecting the plurality of third main cushion grooves and the plurality of fifth main cushion grooves, respectively.

7. The plurality of first sub-cushion grooves are arranged in a diagonal pattern, with their front ends connected to the plurality of first main cushion grooves and their rear ends connected to the plurality of second main cushion grooves located 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. The plurality of second sub-cushion grooves are each connected at their front ends to the plurality of first main cushion grooves, and their rear ends are each connected to the plurality of third main cushion grooves, which are 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 in a diagonal line. The plurality of third sub-cushion grooves are arranged in a diagonal pattern, with their front ends connected to the plurality of second main cushion grooves and their rear ends connected to the plurality of fourth main cushion grooves located 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. The chair seat cushion according to claim 6, wherein the plurality of fourth sub-cushion grooves are each connected at their front ends to the plurality of third main cushion grooves, and their rear ends are each 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 in a diagonal pattern.

8. The number of each of the aforementioned plurality of fourth main cushion grooves and plurality of fifth main cushion grooves is one less than the number of each of the aforementioned plurality of first main cushion grooves, plurality of second main cushion grooves, and plurality of third main cushion grooves. The chair seat cushion according to claim 6, wherein the forwardmost of each of the plurality of fourth main cushion grooves and the plurality of fifth main cushion grooves is positioned at a distance in the left-right direction from the second forward 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.

9. The chair seat cushion according to claim 1, wherein the plurality of main cushion grooves are formed as circular grooves.

10. The chair seat cushion according to claim 1, wherein the plurality of main cushion grooves are formed as polygonal grooves.

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

12. A peripheral groove is formed on the upper peripheral edge of the insertion groove into which the peripheral projection formed on the upper peripheral edge of the seat plate is inserted. The chair seat cushion according to claim 11, wherein the plurality of cushion grooves are formed on the upper surface of the insertion groove, inside the peripheral groove.

13. A seat cushion with multiple cushion grooves formed in the center of its lower surface that deform under the user's seating load, The seat plate includes a seat plate that supports the aforementioned seat cushion, The aforementioned multiple cushion grooves are Multiple main cushion grooves are arranged in multiple rows in the front-to-back and left-to-right directions, and are spaced equally apart from each other. The plurality of main cushion grooves are connected to each other, and the plurality of sub-cushion grooves are formed in a straight shape that is narrower in width and less in depth than the plurality of main cushion grooves, and the plurality of main cushion grooves and the plurality of sub-cushion grooves are symmetrical with respect to the left-right center of the seat cushion. The aforementioned multiple sub-cushion grooves are arranged in a diagonal pattern, becoming closer to the center of the seat cushion in the left-right direction as they move forward. Chair seat board.

14. An insertion groove is formed on the lower surface of the seat cushion into which the seat plate is inserted. The chair seat plate according to claim 13, wherein the plurality of cushion grooves are formed on the upper surface of the insertion groove.

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