Chair

Abstract

Provided is a chair in which, when the front-rear angle of a backrest part is adjusted, a backrest part frame is bent to prevent a waist rest from falling off from the waist of a user, the entire backrest part can support the load of the user, and the load applied to the backrest part can be dispersed to improve the seating feeling. To this end, the chair of the present invention comprises: a backrest frame for supporting a backrest; a back plate column coupled to the lower end of the backrest frame by a hinge and capable of rotating back and forth with the lower end as a rotation center; a back plate slider coupled to a portion of the back plate column higher than the hinge so as to be capable of sliding up and down; and a back plate connector for connecting the backrest frame and the back plate slider, the back plate connector moving the backrest frame in the direction in which the load of the user acts.

Description

Technical Field

[0001] The present invention relates to a chair, and more particularly to a chair with a backrest tilted backwards. Background Art

[0002] Generally speaking, a chair with a backrest that tilts backward allows a user to tilt (tilting; adjusting the front-rear angle of the backrest) while leaning the back against the backrest after sitting on the chair.

[0003] Korean Patent Gazette No. 10-1980343 (publication date: August 28, 2019) (hereinafter referred to as "the prior art") discloses a "chair with improved lumbar support", which is a chair with a backrest tilted backward as described above.

[0004] The above-mentioned prior art includes a rear seat frame as a supporting structure of the above-mentioned backrest portion, and the above-mentioned rear seat frame includes a lumbar support (Lumbar) as a structure for supporting the waist of the user.

[0005] However, in the above-mentioned prior art, when the user leans his back against the backrest and tilts, the shape of the backrest does not change and tilts backward as it is. Therefore, when the user sits on the chair and performs the above-mentioned tilting operation, even if the user leans with his waist against the above-mentioned waist support, the angles of the legs and buttocks remain unchanged, and only the back moves.

[0006] In this case, since the waist is separated from the lumbar support and a gap is generated, the lumbar support cannot support the user's waist, and only a part of the back contacts the backrest, so there is a problem that pressure is applied only to the part contacting the back. Summary of the invention

[0007] Technical issues

[0008] The technical problem of the present invention is to provide a chair, in which the backrest frame bends when the front and rear angle of the backrest is adjusted, thereby preventing the lumbar support from falling off the user's waist, and then the entire backrest can support the user's load and disperse the user's load applied to the backrest, thereby improving the sitting feeling.

[0009] Another technical problem of the present invention is to provide a chair, wherein when the backrest portion is tilted backward, the lumbar support cover applies force downward, so that the lumbar support can push the user's lumbar spine.

[0010] Another technical problem of the present invention is to provide a chair, which enables the backrest to move together when the user moves his body left and right, so that the backboard and the user's body can move organically without separation.

[0011] The technical problems of the present invention are not limited to the above problems, and those skilled in the art can clearly understand other problems not mentioned from the following description.

[0012] Solutions to the problem

[0013] In order to solve the above problem, the chair of the present invention includes a backrest frame, a back panel column, a back panel slider and a back panel connector. The backrest frame supports the backrest. The back panel column is connected to the lower end of the backrest frame by a hinge. The back panel column can rotate forward and backward with the lower end as the rotation center. The back panel slider is connected to the portion of the back panel column higher than the hinge in a manner that it can slide up and down. The back panel connector connects the backrest frame and the back panel slider. The back panel connector enables the backrest frame to move in the direction in which the user's load acts.

[0014] The backplane connector may be formed of a soft material that can be deformed by a load from the user.

[0015] A connector insertion portion may be formed protrudingly on the front surface of the back panel slider. An insertion space with an opening on the front surface may be formed on the connector insertion portion. The back panel connector may include a connector ring, a rear connector and a front connector. A through hole may be formed in the connector ring in a front-to-rear through-hole, and the front end of the connector insertion portion is inserted into the through hole. The rear end of the rear connector may be inserted into the insertion space. The front end of the rear connector may protrude forward of the connector insertion portion and be disposed in the through hole. The front connector may be combined with the front end of the connector ring. The front connector may be fastened to the front end of the rear connector. The front connector may be fastened to the backrest frame.

[0016] An insertion groove into which the front end portion of the rear connector is inserted may be formed on the rear surface of the front connector.

[0017] A first fastening groove leading to the center of the insertion space may be formed in the back panel slider. A second fastening groove leading to the front-rear direction may be formed in the center of the front connector. A third fastening groove leading to the front-rear direction may be formed in the center of the rear connector. The third fastening groove may be formed such that the diameter of the rear end portion is larger than the diameter of the front end portion. The chair of the present invention may also include an inner fastening component and an outer fastening component. The inner fastening component may include a first head and an inner rod. The first head may contact the rear surface of the back panel slider. The inner rod may protrude from the front surface of the first head. The inner rod may be inserted into the rear end portion of the third fastening groove by passing through the first fastening groove. The outer fastening component may include a second head and an outer rod. The second head may contact the front surface of the front connector. The outer rod may protrude from the rear surface of the second head. The outer rod may be inserted into the third fastening groove and fastened to the inner rod by passing through the second fastening groove.

[0018] A second head cover surrounding the second head may be protrudingly formed at the center of the front surface of the front connector.

[0019] A first flange inserted into the insertion groove may be formed on the front end outer circumferential surface of the rear connector in a radially protruding manner. A second flange may be formed on the front end outer circumferential surface of the connector ring in a radially protruding manner. A third flange insertion groove may be formed on the front end inner circumferential surface of the connector ring. A third flange may be formed on the rear end outer circumferential surface of the front connector in a radially protruding manner. The third flange may be inserted into the third flange insertion groove.

[0020] The front connector may be provided with a fourth fastening groove extending in the front-rear direction. The fourth fastening groove may be provided for a fastening member fastened to the backrest frame to pass through. A fastening groove may be formed on the front surface of the rear connector. The fastening groove may be provided for the end of the fastening member to be inserted.

[0021] An insertion groove having a vertical length longer than that of the back plate slider may be formed on the front surface of the upper end of the back plate column. A sliding engagement protrusion may be formed on the rear surface of the back plate slider. A sliding engagement groove having a vertical length longer than that of the sliding engagement protrusion and for inserting the sliding engagement protrusion may be formed in the insertion groove of the back plate column. Sliding protrusions may be formed on the left and right sides of the sliding engagement protrusion, respectively, and the sliding protrusions are inserted into the sliding grooves formed on the left and right sides of the sliding engagement groove respectively and are arranged in a manner capable of moving up and down.

[0022] The backrest frame may include a backrest plate, a lumbar support and a lumbar support cover. The backrest plate may be combined with the back plate connector. The lumbar support may be provided on the front surface of the lower end portion of the backrest plate. The lumbar support may support the waist of the user. The lumbar support cover may be combined with the rear surface of the lower end portion of the backrest plate. The lumbar support cover may support the waist load of the user applied to the lumbar support. A hinge joint portion connected by the hinge may be protrudingly formed at the central lower end in the left-right direction of the lumbar support cover.

[0023] The hinge joint may be formed to protrude downward relative to a lower end of the backrest plate.

[0024] The hinge joint may be formed of an elastic body.

[0025] The backrest plate may be formed of an elastic body. The backrest plate may be formed with a plurality of slits extending in the front-rear direction and in the left-right direction.

[0026] The backrest portion may further include a backrest pad. The backrest pad may be arranged on the front surface of the backrest board. The backrest pad may have a buffering force. The lumbar support may be arranged between the backrest pad and the backrest board.

[0027] A plurality of rigid reinforcement ribs may be protrudingly formed on a front surface of an upper end portion of the backrest plate at a portion higher than the lumbar support.

[0028] When the user tilts the back panel column backward while leaning his back against the backrest, the back panel slider can slide downward, and the backrest frame rotates around the hinge as the rotation center while bending, so that the upper part moves backward and the lower part moves forward.

[0029] Specific details of other embodiments are included in the detailed description and accompanying drawings.

[0030] Effects of the Invention

[0031] In the chair of the present invention, when tilted (adjusting the front and rear angle of the backrest), the lumbar support portion moves forward to fill the space between the waist, so that the entire body contacts the backrest to distribute the load without applying local pressure, thereby having the effect of improving the sitting feeling.

[0032] Furthermore, in the chair of the present invention, when tilted, the back panel connector causes the backrest frame to move in the direction of the user's load, so that the left and right sides of the backrest can always be in contact with the user's back. When working or moving the body on the chair, the body moves with the backrest, thereby also having the effect of improving the sitting feel.

[0033] Furthermore, in the chair of the present invention, when the user is tilted, the lumbar support cover applies force downward due to the bending angle of the backrest plate, thereby also having the effect that the lumbar support pushes the user's lumbar spine.

[0034] Furthermore, in the chair of the present invention, when the chair is tilted, the backrest naturally descends and moves together with the back, thereby also having the effect of preventing clothes from rolling up due to friction with the backrest.

[0035] The effects of the present invention are not limited to the above-mentioned effects, and those skilled in the art can clearly understand other effects not mentioned from the description of the scope of protection claimed for the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a front perspective view showing a chair according to an embodiment of the present invention.

[0037] Figure 2 The figure is a rear perspective view of a chair showing an embodiment of the present invention.

[0038] Figure 3 2 is an exploded view of the main structure of a chair according to an embodiment of the present invention.

[0039] Figure 4 To briefly show Figures 1 to 3 A side cross-sectional view of the backrest is shown.

[0040] Figure 5 To show Figures 1 to 3 A front perspective view of the backrest frame and back panel posts are shown.

[0041] Figure 6 To show Figures 1 to 3 A rear perspective view of the backrest frame and back panel posts shown.

[0042] Figure 7 To show specifically Figure 4 A side view of the backrest frame is shown.

[0043] Figure 8 An exploded perspective view showing the upper end of the backplane column, the backplane slider and the backplane connector.

[0044] Fig. 9 for Figure 8 Rear perspective view of .

[0045] Fig.10 It is a side cross-sectional view showing a state in which the backrest frame is connected to the upper end of the back plate column through the back plate slider and the back plate connector.

[0046] Fig.11 An exploded perspective view showing the lower end of the backrest frame and the back panel pillar.

[0047] Fig.12 for Fig.11 Rear perspective view of .

[0048] Fig.13 It is a side cross-sectional view showing a state where the lower end of the backrest frame is connected to the back plate pillar by a hinge.

[0049] Fig.14 This figure shows the effect when the back plate pillar is tilted backward while the user leans his back against the backrest.

[0050] Description of Reference Numerals

[0051] 120: backrest 121: backrest cushion

[0052] 122: Backrest frame 123: Backrest board

[0053] 123A: Rigid reinforcement rib 124: Lumbar support cover

[0054] 125: Lumbar support 126: Slit

[0055] 127: hinge joint 400: back plate column

[0056] 410: Insertion groove 415: Sliding joint groove

[0057] 600: back plate slider 615: sliding joint protrusion

[0058] 616: Sliding protrusion 620: Connector insertion portion

[0059] 621: Insertion space 622: First fastening groove

[0060] 700: Backplane connector 710: Connector ring

[0061] 711: Through hole 715: Second flange

[0062] 716: third flange insertion slot 720: rear connector

[0063] 722: third fastening groove 725: first flange

[0064] 727: Fastening groove 730: Front connector

[0065] 731: Insertion groove 732: Second fastening groove

[0066] 733: Second head cover 735: Third flange

[0067] 737: Fourth fastening groove 740: Inner fastening member

[0068] 741: first head 742: inner rod

[0069] 750: External fastening member 751: Second head

[0070] 752: Outer rod H: Hinge DETAILED DESCRIPTION

[0071] Hereinafter, a chair according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0072] Figure 1 To illustrate a front perspective view of a chair according to an embodiment of the present invention, Figure 2 The figure is a rear perspective view of a chair showing an embodiment of the present invention.

[0073] Reference Figure 1 and Figure 2 The chair 1 of the embodiment of the present invention may include a chair body 100 , an adjustment device 200 , a leg portion 300 , a back column 400 , and armrest portions 510 , 520 .

[0074] The chair body 100 may include a seat portion 110, a backrest portion 120, and a headrest portion 130. The seat portion 110, the backrest portion 120, and the headrest portion 130 may be substantially square.

[0075] The seat portion 110 may extend forward and backward. The seat portion 110 may be a portion where a user sits. The seat portion 110 may support the user's buttocks and the thighs of each leg of the user.

[0076] In the upper surface of the seat portion 110, the rear portion as a portion supporting the user's buttocks can be slightly concave toward the lower side, and the front portion as a portion supporting the user's thighs on both sides can be tilted in a manner that moves closer to the lower side as it moves forward.

[0077] The backrest portion 120 extends up and down, and the lower end portion can extend in a manner that is located forward relative to the upper end portion. The lower end portion of the backrest portion 120 can be hinged (H, see Fig.13 ) is combined with the back plate pillar 400. The hinge H may include a horizontal axis (not shown) extending in the left-right direction. The backrest portion 120 may be formed as a separate structure separated from the seat portion 110.

[0078] The headrest portion 130 may extend up and down. The headrest portion 130 may be combined with the front surface of the upper end portion of the backrest portion 120. The headrest portion 130 may be formed as one piece with the backrest portion 120, and the lower end portion may be combined with the front surface of the upper end portion of the backrest portion 120 in a manner that allows rotation about a horizontal axis (not shown) extending in the left-right direction as the rotation center.

[0079] The seat portion 110 may include a seat cushion 111 and a seat plate 112. The seat cushion 111 may be disposed on the upper side of the seat plate 112. The seat cushion 111 may be formed of a material having a cushioning force to provide a cushioning feeling to the user, and the seat plate 112 may be formed of a material harder than the seat cushion 111 to support the seat cushion 111.

[0080] The backrest 120 may be a portion that supports the back of the user. The backrest 120 may include a backrest pad 121 and a backrest frame 122. The backrest pad 121 may be disposed in front of the backrest frame 122. The backrest pad 121 may be formed of a material having a cushioning force to provide a cushioning feeling to the user, and the backrest frame 122 may be formed of a material harder than the backrest pad 121 to support the backrest pad 121.

[0081] The backrest frame 122 may include a backrest plate 123, a lumbar support 125 (see Figure 4 and Figure 5 ) and lumbar support cover 124.

[0082] The backrest board 123 can support the back and waist load of the above-mentioned user. The rear surface of the backrest board 123 can be connected to the backboard connector 700 (see Figure 3 )combined.

[0083] When the user sits on the chair 1, the lower end of the backrest board 123 may be arranged to face the waist of the user. The lumbar support 125 may be arranged on the front surface of the lower end of the backrest board 123 to support the waist of the user. The lumbar support 125 may be in the shape of a plate with a concave front surface and a convex rear surface so as to surround the waist of the user. The lumbar support cover 124 may be combined with the rear surface of the lower end of the backrest board 123 to support the waist load of the user applied to the lumbar support 125.

[0084] The headrest portion 130 may be a portion that supports the head of the user. The headrest portion 130 may include a headrest pad 131 and a headrest board 132. The headrest pad 131 may be disposed in front of the headrest board 132. The headrest pad 131 may be formed of a material having a cushioning force to provide a cushioning feeling to the user, and the headrest board 132 may be formed of a material harder than the headrest pad 131 to support the headrest pad 131.

[0085] 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.

[0086] The seat plate 112 and the headrest plate 132 are formed to have slight flexibility and can be slightly deformed by the load of a user sitting on the chair 1 .

[0087] In particular, the backrest board 123 is formed of an elastic body and is elastically deformed by the load of the user acting on the backrest portion 120 , thereby improving the sitting feeling of the user sitting on the chair 1 .

[0088] The adjusting device 200 may be disposed at the lower side of the seat portion 110. The adjusting device 200 may be coupled to the lower side of the seat plate 112 of the seat portion 110. The adjusting device 200 may adjust the height of the chair body 100 and the front-rear angle of the back plate column 400.

[0089] 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 a lever protruding from the right side of the adjustment device 200 and adjusting the height of the chair body 100 through the operation of the user, and the second lever 220 may be a lever protruding from the left side of the adjustment device 200 and adjusting the front-rear angle of the back plate column 400 through the operation of the user.

[0090] A cylinder device 350 for adjusting the height of the chair body 100 may be provided at the center of the leg 300. The cylinder device 350 may be provided vertically. The cylinder device 350 may include a cylinder and a piston rod. The cylinder may be inserted into a hole formed in the center of the leg 300 in a vertically penetrating manner and coupled to the center of the leg 300, and the upper end of the piston rod may be coupled to the adjustment device 200. When the user pulls the first lever 210 upward while sitting on the chair body 100, the piston rod may be pulled out of the cylinder through the hole formed at the upper end of the cylinder and move upward, thereby allowing the user to adjust the height of the chair body 100.

[0091] The leg 300 may be disposed at the lower side of the adjusting device 200. The leg 300 may support the adjusting device 200. The leg 300 may include a plurality of leg bodies 310 disposed radially. In the present embodiment, the plurality of leg bodies 310 are formed as 5, but may also be formed as 3 or more. The wheel 320 may be rotatably coupled to the respective ends of the plurality of leg bodies 310.

[0092] The back plate column 400 may support the backrest portion 120. The upper portion of the back plate column 400 may extend long in the up-down direction, and the lower portion of the back plate column 400 may be bent forward from the upper lower end of the back plate column 400 and extend forward. The upper end of the back plate column 400 may be disposed at a position lower than the upper end of the backrest portion 120. The upper end of the back plate column 400 may be disposed at a position lower than the upper end of the backrest board 123. The left-right width of the back plate column 400 may be formed to be narrower than the left-right width of the backrest portion 120. The left-right width of the back plate column 400 may be formed to be narrower than the left-right width of the backrest board 123. The upper portion of the back plate column 400 may be disposed opposite to the left-right center of the backrest portion 120 in the rear surface of the backrest portion 120. The upper portion of the back plate column 400 may be disposed opposite to the left-right center of the backrest board 123 in the rear surface of the backrest board 123.

[0093] The armrests 510 and 520 may support the left and right arms of the user. The armrests 510 and 520 may include a left armrest 510 for supporting the left arm of the user and a right armrest 520 for supporting the right arm of the user. The left armrest 510 and the right armrest 520 may be formed of the same structure.

[0094] The left armrest portion 510 may include a left armrest column 511 and a left armrest 512 .

[0095] The upper portion of the left handrail column 511 may extend vertically, and the lower portion of the left handrail column 511 may be bent to the right from the upper lower end of the left handrail column 511 and extend to the right. The lower end of the left handrail column 511 may be combined with the left side of the lower end portion of the back plate column 400.

[0096] The left armrest 512 may be a portion that actually supports the user's left arm. The left cushion, which is the top structure of the left armrest 512, may be in contact with the user's left arm. In the left armrest 512, the lower side of the left cushion may be combined with a left rod. The left rod may be inserted into the left armrest column 511 through a hole formed at the upper end of the left armrest column 511, and the height may be adjusted by pulling it out of or inserting it into the left armrest column 511 through the operation of the user. Furthermore, the left cushion may also be configured to adjust the front-rear position relative to the left rod.

[0097] The upper portion of the right handrail column 521 may extend vertically, and the lower portion of the right handrail column 521 may be bent to the left from the upper lower end of the right handrail column 521 and extend to the left. The lower end of the right handrail column 521 may be combined with the right side of the lower end portion of the back plate column 400.

[0098] The right armrest 522 may be a portion that actually supports the right arm of the user. The right cushion, which is the top structure of the right armrest 522, may be in contact with the right arm of the user. In the right armrest 522, the lower side of the right cushion may be combined with the right rod. The right rod may be inserted into the inside of the right armrest column 521 through a hole formed at the upper end of the right armrest column 521, and the height may be adjusted by pulling it out or inserting it into the right armrest column 521 through the operation of the user. In addition, the right cushion may also be configured to adjust the front and rear position of the right rod.

[0099] Figure 3 2 is an exploded view of the main structure of a chair according to an embodiment of the present invention.

[0100] Reference Figure 3 The lower end of the back plate column 400 is arranged to rotate with a horizontal axis (not shown) extending in the left-right direction as the rotation center, so that the back plate column 400 can rotate and tilt (adjust the front and rear angle) with the lower end as the rotation center.

[0101] That is, the adjusting device 200 may include a pair of inclined bridges 250 extending in the front-to-back direction, the lower end of the backplate column 400 can be combined with the rear end of the inclined bridge 250 in a manner of rotating around a horizontal axis (not shown) as the rotation center, and the front end of the inclined bridge 250 can be combined with the adjusting device 200.

[0102] A hole may be formed at the rear end of the tilt bridge 250, and the lower end of the back plate column 400 may be rotatably coupled to the hole via a horizontal shaft (not shown) extending in the left-right direction. The hole may be formed by extending forward and backward.

[0103] On the other hand, when the user sits on the chair 1 and leans the back against the backrest 120 and tilts the back plate column 400 backward, the backrest frame 122 may bend while keeping the backrest 120 close to the user's back and waist.

[0104] To this end, the lower end of the backrest frame 122 can be connected by a hinge H (see Fig.13 ) is combined with the back panel column 400, and the upper end of the backrest frame 122 can be combined with the upper end of the back panel column 400 through the back panel slider 600 and the back panel connector 700.

[0105] The back panel slider 600 can be coupled to a portion of the back panel column 400 that is higher than the hinge H in a manner that allows it to slide up and down, and the back panel connector 700 can connect the back panel slider 600 and the backrest frame 122 .

[0106] When the user leans the back plate column 400 backward while leaning the back against the backrest 120, the back plate slider 600 can slide downward, so that the backrest frame 122 rotates around the hinge H as the rotation center while bending, so that the upper and lower parts of the backrest 120 can be kept in close contact with the user's back and waist. In this case, the back plate connector 700 can move the backrest frame 122 in the direction of the user's load to keep the left and right sides of the backrest 120 in close contact with the user's back and waist.

[0107] As such, when the user tilts the backrest 120, in order to enable the backplane connector 700 to move the backrest frame 122 in the direction in which the user's load is applied, the backplane connector 700 is preferably formed of a soft material that can be deformed by the user's load. That is, when the user tilts the backrest 120, the backplane connector 700 is deformed by the user's load and can move the backrest frame 122 in the direction in which the user's load is applied.

[0108] Will refer to Fig.14 The effect when the user performs a tilting operation on the backrest portion 120 will be described in detail later. Hereinafter, the detailed structures of the backrest portion frame 122 , the backboard slider 600 , and the backboard connector 700 will be described first.

[0109] Figure 4 To briefly show Figures 1 to 3 A side cross-sectional view of the backrest shown, Figure 5 To show Figures 1 to 3 The front perspective view of the backrest frame and backboard column shown, Figure 6 To show Figures 1 to 3 The back perspective view of the backrest frame and backboard column shown, Figure 7 To show specifically Figure 4 A side view of the backrest frame is shown.

[0110] Reference Figures 4 to 7 As described above, the backrest frame 122 may include a backrest plate 123 , a lumbar support 125 , and a lumbar support cover 124 .

[0111] The front surface of the backrest board 123 can be combined with the backrest pad 121 having a buffering force. The rear surface of the backrest board 123 can be combined with the above-mentioned backboard connector 700. The outside of the backboard board 123 is covered with a fiber material cover, and the backboard board 123 can be set in the above-mentioned fiber material cover.

[0112] The lumbar support cover 124 may be combined with the rear surface of the lower end of the backrest board 123. The front surface of the lumbar support cover 124 may be combined with a lumbar support 125 for supporting the waist of the user, and the lumbar support 125 may be provided on the front surface of the lower end of the backrest board 123. The lumbar support 125 may be provided between the back cushion 121 and the backrest board 123 to support the waist of the user leaning on the back cushion 121. The lumbar support 125 may be combined with the lumbar support cover 124 through a hole formed at the lower end of the backrest board 123. The lumbar support cover 124 may be combined with the rear surface of the lower end of the backrest board 123 to support the waist load of the user applied to the lumbar support 125.

[0113] The lower end of the waist support cover 124 in the left-right direction may be formed with a hinge H (see Fig.13 ) is connected to the backrest 120. The hinge joint 127 may be formed to protrude downward relative to the lower end of the backrest plate 123. The hinge joint 127 is formed of an elastic body, so when the user tilts the backrest 120, it can be elastically deformed.

[0114] A plurality of rigid reinforcement ribs 123A may be protrudingly formed on the front surface of the upper end of the backrest board 123. The plurality of rigid reinforcement ribs 123A may be formed on a portion of the front surface of the upper end of the backrest board 123 that is higher than the lumbar support 125. The lumbar support 125 may be provided on the front surface of the lower end of the backrest board 123, which is a portion of the front surface of the backrest board 123 where the plurality of rigid reinforcement ribs 123A are not formed.

[0115] The plurality of rigid reinforcing ribs 123A can provide the backrest board 123 with strength sufficient to support the load of the user's back, and can also provide the backrest board 123 with strength sufficient to bend elastically due to the load of the user's back.

[0116] The multiple rigid reinforcing ribs 123A may include a circular rib formed in the center of the front surface of the backrest plate 123, a first arc-shaped rib surrounding the outside of the above-mentioned circular rib, a second arc-shaped rib surrounding the outside of the above-mentioned first arc-shaped rib, a plurality of lattice ribs formed on the entire front surface of the upper end portion of the backrest plate 123, and a plurality of straight ribs radially arranged and connecting the above-mentioned circular rib, the above-mentioned first arc-shaped rib, the above-mentioned second arc-shaped rib and the above-mentioned multiple lattice ribs.

[0117] The backrest board 123 is formed of an elastic body, so it can be elastically deformed when the user leans on the backrest 120. A plurality of slits 126 extending in the front-rear direction and in the left-right direction are formed in the backrest board 123, so the backrest board 123 can be easily deformed by the back and waist load of the user.

[0118] Figure 8 The exploded perspective view is to show the upper end of the backplane column, the backplane slider and the backplane connector. Fig. 9 for Figure 8The back stereogram of Fig.10 It is a side cross-sectional view showing a state in which the backrest frame is connected to the upper end of the back plate column through the back plate slider and the back plate connector.

[0119] Reference Figures 8 to 10 , the backplane slider 600 can be combined with the front surface of the upper end of the backplane column 400 in a manner that it can slide back and forth. An insertion groove 410 for inserting the backplane slider 600 can be formed on the front surface of the upper end of the backplane column 400. The upper and lower lengths of the insertion groove 410 can be formed to be longer than the upper and lower lengths of the backplane slider 600. The backplane slider 600 can slide up and down within a range until the upper end of the backplane slider 600 contacts the upper side in the insertion groove 410 and the lower end of the backplane slider 600 contacts the lower side in the insertion groove 410.

[0120] The backplane slider 600 may be in the shape of a rectangle that is long from top to bottom. A sliding joint protrusion 615 may be formed protrudingly on the rear surface of the backplane slider 600. The edge of the sliding joint protrusion 615 is in the shape of a rectangle that is long from left to right, and a plurality of spaces may be formed inside the sliding joint protrusion 615.

[0121] A sliding coupling groove 415 into which the sliding coupling protrusion 615 is inserted may be formed in the insertion groove 410 of the back plate column 400. The vertical length of the sliding coupling groove 415 may be formed to be longer than the vertical length of the sliding coupling protrusion 615. The back plate slider 600 may move up and down within a range until the upper end of the sliding coupling protrusion 615 contacts the upper side in the sliding coupling groove 415 and the lower end of the sliding coupling protrusion 615 contacts the lower side in the sliding coupling groove 415.

[0122] Sliding protrusions 616 and 617 may be formed on the left and right sides of the sliding coupling protrusion 615, respectively. The sliding protrusions 616 and 617 may include a first sliding protrusion 616 formed on the left side of the sliding coupling protrusion 615 and a second sliding protrusion 617 formed on the right side of the sliding coupling protrusion 615. A pair of first sliding protrusions 616 may be formed on the left side of the sliding coupling protrusion 615, but at least one first sliding protrusion 616 is formed on the left side of the sliding coupling protrusion 615. A pair of second sliding protrusions 617 may be formed on the right side of the sliding coupling protrusion 615, but at least one second sliding protrusion 617 may be formed on the right side of the sliding coupling protrusion 615.

[0123] Preferably, sliding grooves (not shown) are formed on the left and right sides of the sliding coupling groove portion 415 , respectively, and the sliding protrusions 616 , 617 are inserted into the above-mentioned sliding grooves and are arranged in a manner of being able to move up and down.

[0124] A connector insertion portion 620 may be formed protrudingly on the front surface of the backplane slider 600. An insertion space 621 with an opening on the front surface may be formed on the connector insertion portion 620. The connector insertion portion 620 may be cylindrical with an opening on the front surface. The longitudinal section of the connector insertion portion 620 may be elliptical. However, the longitudinal section of the connector insertion portion 620 may be circular or polygonal.

[0125] A first fastening groove 622 leading to the center of the insertion space 621 may be formed in the back plate slider 600 .

[0126] The backplane connector 700 may include a connector ring 710, a rear connector 720, and a front connector 730. The connector ring 710, the rear connector 720, and the front connector 730 may have a shape corresponding to the connector insertion portion 620. That is, the longitudinal cross-sectional shape of each of the connector ring 710, the rear connector 720, and the front connector 730 may be an ellipse.

[0127] The connector ring 710 may be formed with a through hole 711 penetrating from front to back into which the front end of the connector insertion portion 620 is inserted.

[0128] The rear end portion of the rear connector 720 may be inserted into the insertion space 621 of the connector insertion portion 620 . The front end portion of the rear connector 720 may protrude forward of the connector insertion portion 620 and be disposed in the through hole 711 of the connector ring 710 .

[0129] The front connector 730 may be coupled to the front end portion of the connector ring 710. The front connector 730 may be fastened to the front end portion of the rear connector 720. An insertion groove 731 into which the front end portion of the rear connector 720 is inserted may be formed at a rear surface of the front connector 730.

[0130] A second fastening groove 732 extending in the front-rear direction may be formed at the center of the front connector 730. A third fastening groove 722 extending in the front-rear direction may be formed at the center of the rear connector 720. The third fastening groove 722 may be formed such that the diameter of the rear end portion 722A is larger than the diameter of the front end portion.

[0131] The connector ring 710, the rear connector 720, the front connector 730 and the backplane slider 600 may be fastened by the inner fastening member 740 and the outer fastening member 750. That is, the backplane connector 700 may be fastened to the backplane slider 600 by the inner fastening member 740 and the outer fastening member 750.

[0132] The inner fastening member 740 may include a first head portion 741 and an inner rod portion 742. The first head portion 741 may contact the rear surface of the back plate slider 600. The inner rod portion 742 may be protruded from the front surface of the first head portion 741. The inner rod portion 742 may pass through the first fastening groove 622 and be inserted into the rear end portion 722A of the third fastening groove 722.

[0133] The outer fastening member 750 may include a second head 751 and an outer rod 752. The second head 751 may contact the front surface of the front connector 730. The outer rod 752 may be protruded from the rear surface of the second head 751. The outer rod 752 may be inserted into the third fastening groove 722 by passing through the second fastening groove 732 and fastened to the inner rod 742.

[0134] A thread may be formed on the inner circumferential surface of the inner rod portion 742 , and a thread engaged with the thread formed on the inner circumferential surface of the inner rod portion 742 may be formed on the outer circumferential surface of the outer rod portion 752 .

[0135] The inner rod portion 742 and the outer rod portion 752 may be fastened within the rear end portion 722A of the third fastening groove 722 .

[0136] A second head cover 733 surrounding the second head 751 may be protruded at the center of the front surface of the front connector 730. A second fastening groove 732 may be formed at the center of the inner space of the second head cover 733 in a manner extending in the front-rear direction.

[0137] The inner circumferential surface of the second head cover 733 may be formed as a first curved surface that is recessed backward, and the rear surface of the second head 751 may be formed as a second curved surface that is convex backward matching the first curved surface.

[0138] A first flange 725 may be formed on the outer peripheral surface of the front end of the rear connector 720 to protrude in the radial direction, and the first flange 725 is inserted into an insertion groove 731 formed on the rear surface of the front connector 730 .

[0139] A second flange 715 may be formed on the outer peripheral surface of the front end of the connector ring 710 to protrude in the radial direction. A third flange insertion groove 716 (see Fig.10 ).

[0140] A third flange 735 may be formed to protrude radially from the rear end outer circumferential surface of the front connector 730 . The third flange 735 may be inserted into the third flange insertion groove 716 .

[0141] The front connector 730 may be formed with a fourth fastening groove 737 in a manner extending in the front-rear direction. A fastening member (e.g., a bolt, not shown) fastened to the back plate 123 of the backrest frame 122 may pass through the fourth fastening groove 737. A fastening groove 727 may be formed on the front surface of the rear connector 720. The end of the fastening member passing through the fourth fastening groove 737 may be inserted into the fastening groove 727. That is, the back plate connector 700 may be fastened to the back plate 123 of the backrest frame 122 by the fastening member.

[0142] The fourth fastening groove 737 may be provided at an outer side relative to the second head cover 733. The fourth fastening groove 737 and the fastening groove 727 may be provided in plural numbers. In the present embodiment, the fourth fastening groove 737 and the fastening groove 727 may be provided in a pair, respectively.

[0143] Fig.11 1 is an exploded perspective view showing the lower end of the backrest frame and the backboard column. Fig.12 for Fig.11 The back stereogram of Fig.13 It is a side cross-sectional view showing a state where the lower end of the backrest frame is connected to the back plate pillar by a hinge.

[0144] Reference Figures 11 to 13 As described above, a hinge joint portion 127 may be protrudingly formed at the lower end of the lumbar support cover 124 and connected to the back plate pillar 400 through the hinge H.

[0145] The hinge joint 127 can be divided into two parts, including a left hinge joint 127A disposed on the left side and a right hinge joint 127B disposed on the right side.

[0146] A pair of first hinge protrusions 128 spaced apart from each other in the left-right direction may be formed on the lower rear surface of the left hinge joint 127A. First hinge holes 128A communicating left and right may be formed on the pair of first hinge protrusions 128, respectively.

[0147] A pair of second hinge protrusions 129 spaced apart from each other in the left-right direction may be formed on the lower rear surface of the right hinge joint 127B. Second hinge holes 129A communicating left and right may be formed on the pair of second hinge protrusions 129, respectively.

[0148] A first hinge groove 420 into which the pair of first hinge protrusions 128 are inserted and a second hinge groove 430 into which the pair of second hinge protrusions 129 are inserted may be formed on the front surface of the back plate column 400. The first hinge groove 420 and the second hinge groove 430 may be disposed left and right.

[0149] A first insertion protrusion 421 inserted between the pair of first hinge protrusions 128 may be formed in the first hinge groove 420. First coupling protrusions 422 may be formed on the left and right sides of the first insertion protrusion 421, and the first coupling protrusions 422 are inserted into the first hinge holes 128A respectively formed in the pair of first hinge protrusions 128 and rotatably coupled to the pair of first hinge protrusions 128.

[0150] A second insertion protrusion 431 inserted between the pair of second hinge protrusions 129 may be formed in the second hinge groove 430. Second coupling protrusions 432 may be formed on the left and right sides of the second insertion protrusion 431, and the second coupling protrusions 432 are inserted into the second hinge holes 129A respectively formed in the pair of second hinge protrusions 129 and rotatably coupled to the pair of second hinge protrusions 129.

[0151] A pair of first hinge protrusions 128, a pair of second hinge protrusions 129, a first coupling protrusion 422 formed on the left and right sides of the first insertion protrusion 421, and a second coupling protrusion 432 formed on the left and right sides of the second insertion protrusion 431 may be actual structures coupled by the hinge H.

[0152] The effect of the chair according to the embodiment of the present invention constructed as described above is observed as follows.

[0153] Fig.14 This figure shows the effect when the back plate pillar is tilted backward while the user leans his back against the backrest.

[0154] Reference Fig.13 and Fig.14 When the user leans the back plate column 400 backward while leaning the back against the backrest 120, the back plate slider 600 slides downward, so that the backrest frame 122 rotates around the hinge H as the rotation center and bends, so that the upper part moves backward and the lower part moves forward. Therefore, the user's back can be kept in close contact with the upper part of the backrest 120, and the user's waist can also be kept in close contact with the lower part of the backrest 120.

[0155] Furthermore, when the user leans his back against the backrest 120 and the back plate column 400 is lowered and tilted backward, the back plate connector 700 is deformed by the load acting on the back plate connector 700 and the backrest frame 122 moves in the direction along which the user's load acts. Therefore, the left and right sides of the backrest 120 can be kept in close contact with the user's back.

[0156] As described above, in the chair 1 of the embodiment of the present invention, when tilted (adjusting the front and rear angle of the backrest), the lower part of the backrest 120 serving as a lumbar support portion moves forward to fill the space between the waist, so that the entire body contacts the backrest 120 to disperse the load without applying local pressure, thereby improving the sitting feeling.

[0157] Furthermore, in the chair 1 of the embodiment of the present invention, when tilted, the back panel connector 700 causes the backrest frame 122 to move in the direction of the user's load, so that the left and right sides of the backrest 120 can always be in contact with the user's back. When working or moving the body on the chair, the body moves with the backrest 120, thereby improving the sitting feel.

[0158] Furthermore, in the chair 1 of the embodiment of the present invention, when tilted, the lumbar support cover 124 applies force in the downward direction due to the bending angle of the backrest board 123, so that the lumbar support 125 can push the lumbar spine of the user.

[0159] Furthermore, in the chair 1 according to the embodiment of the present invention, when tilted, the backrest portion 120 naturally descends and moves together with the back, thereby preventing clothes from rolling up due to friction with the backrest portion 120 .

[0160] Those skilled in the art to which the present invention belongs will appreciate that the present invention can be implemented in other specific forms without changing the technical concept or essential features of the present invention. Therefore, the above-mentioned embodiments should be understood to be illustrative and not restrictive in all aspects. The scope of the present invention is indicated by the attached invention claims rather than the above detailed description, and all changes or deformations derived from the meaning, scope and equivalent concepts of the invention claims should be interpreted as included within the scope of the present invention.

[0161] Industrial Applicability

[0162] The present invention provides a chair, wherein when the front and rear angle of the backrest is adjusted, the backrest frame bends to prevent the lumbar support from falling off the waist of the user, thereby enabling the entire backrest to support the load of the user and dispersing the load of the user applied to the backrest, thereby improving the sitting feeling.

Claims

1. A chair, characterized in that: include: A backrest frame, used for supporting a backrest; The back plate column is connected to the lower end of the backrest frame by a hinge and can rotate forward and backward with the lower end as the rotation center; A back panel slider is coupled to a portion of the back panel column that is higher than the hinge in a manner that allows it to slide up and down; as well as A back panel connector is used to connect the backrest frame and the back panel slider. The back plate connector moves the backrest portion frame in a direction in which a load of a user acts.

2. The chair according to claim 1, characterized in that: The backplane connector is formed of a soft material that can be deformed by a load from the user.

3. The chair according to claim 2, characterized in that: A connector insertion portion is protrudingly formed on the front surface of the backplane slider, and an insertion space with a front surface opening is formed in the connector insertion portion. The above-mentioned backplane connector includes: The connector ring is formed with a through hole in a front-to-back through manner, and the front end portion of the connector insertion portion is inserted into the through hole; a rear connector, the rear end of which is inserted into the insertion space, and the front end of which protrudes forward of the connector insertion portion and is disposed in the through hole; and The front connector is combined with the front end of the connector ring, fastened to the front end of the rear connector, and fastened to the backrest frame.

4. The chair according to claim 3, characterized in that: An insertion groove into which the front end portion of the rear connector is inserted is formed on the rear surface of the front connector.

5. The chair according to claim 4, characterized in that: A first fastening groove leading to the center of the insertion space is formed on the back plate slider. A second fastening groove extending in the front-rear direction is formed at the center of the front connector. A third fastening groove extending in the front-rear direction is formed at the center of the rear connector. The third fastening groove is formed such that the diameter of the rear end portion is larger than the diameter of the front end portion. The above chairs also include: an inner fastening member, comprising a first head portion and an inner rod portion, wherein the first head portion contacts the rear surface of the back plate slider, and the inner rod portion is protrudingly formed on the front surface of the first head portion and is inserted into the rear end portion of the third fastening groove by passing through the first fastening groove; and The outer fastening component includes a second head and an outer rod. The second head contacts the front surface of the front connector. The outer rod is protruding from the rear surface of the second head and is inserted into the third fastening groove by passing through the second fastening groove and fastened to the inner rod.

6. The chair according to claim 5, characterized in that: A second head cover surrounding the second head is protrudingly formed at the center of the front surface of the front connector.

7. The chair according to claim 5, characterized in that A first flange inserted into the insertion groove is formed on the front end outer peripheral surface of the rear connector protruding in the radial direction. A second flange is formed on the outer peripheral surface of the front end of the connector ring and protrudes in the radial direction, and a third flange insertion groove is formed on the inner peripheral surface of the front end of the connector ring. A third flange is formed on the rear end outer peripheral surface of the front connector to protrude in the radial direction and is inserted into the third flange insertion groove.

8. The chair according to claim 5, characterized in that The front connector is provided with a fourth fastening groove extending in the front-rear direction and through which a fastening member fastened to the backrest frame passes. A fastening groove into which the distal end of the fastening member is inserted is formed on the front surface of the rear connector.

9. The chair according to claim 1, characterized in that: An insertion groove having a vertical length longer than that of the back plate slider is formed on the front surface of the upper end of the back plate column. A sliding engagement protrusion is formed on the rear surface of the back plate slider. A sliding coupling groove portion is formed in the insertion groove of the back plate column, the vertical length of which is longer than the vertical length of the sliding coupling protrusion portion and into which the sliding coupling protrusion portion is inserted. Sliding protrusions are formed on the left and right sides of the sliding engagement protrusion portion, respectively. The sliding protrusions are inserted into the sliding grooves formed on the left and right sides of the sliding engagement groove portion, respectively, and are provided in a manner capable of moving up and down.

10. The chair according to claim 1, characterized in that The backrest frame comprises: a backrest plate, coupled to the backrest connector; A lumbar support, disposed on the front surface of the lower end of the backrest plate, for supporting the user's waist; and a lumbar support cover, which is combined with the rear surface of the lower end of the backrest plate and is used to support the lumbar load of the user applied to the lumbar support, A hinge joint portion connected by the hinge is protrudingly formed at the lower end of the center in the left-right direction of the waist support cover.

11. The chair according to claim 10, characterized in that The hinge joint is formed of an elastic body and is formed to protrude downward relative to the lower end of the backrest plate.

12. The chair according to claim 10, characterized in that The backrest plate is formed of an elastic body. The back plate is formed with a plurality of slits extending in the front-rear direction and in the left-right direction.

13. The chair according to claim 10, characterized in that The backrest portion further comprises a backrest pad provided on the front surface of the backrest plate and having a buffering force. The lumbar support is arranged between the backrest cushion and the backrest board.

14. The chair according to claim 10, characterized in that A plurality of rigid reinforcement ribs are protrudingly formed on a front surface of an upper end portion of the backrest plate at a portion higher than the lumbar support.

15. The chair according to claim 1, characterized in that When the user tilts the back panel column backward while leaning his back against the backrest, the back panel slider slides downward, and the backrest frame rotates around the hinge as the rotation center while bending, so that the upper part moves backward and the lower part moves forward.

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