Chair

Abstract

A chair is disclosed. A chair of the present disclosure includes: a chair body having a base frame; a first support part provided at the base frame, and moving in response to user's movement while supporting the user's hips and back; and a second support part provided at the base frame, elastically supporting the first support part, and moving in coordination with a back support body of the first support part when the first support part is moved, wherein, through the interaction of the triple support parts, a wide range of posture changes is possible, and the center of gravity shifts in accordance with the user's posture, thereby maintaining the overall balance.

Description

BACKGROUNDTechnical Field

[0001] The present disclosure relates to a chair and, more specifically, a chair of which the position angle is automatically adjusted from a case in which a user performs intensive work to an angle at which the user can lie down and rest, by operating in response to the user's movement.Description of the Related Art

[0002] In general, office or student chairs are used together with desks in offices or homes for work or study, and they typically belong to a different technical field from seats installed in automobiles. The seat pan, which is one of the components of such an office chair, serves to support the user's buttocks.

[0003] In such chairs of the related art, the legs of the chairs are not fixed to the floor, so most of the chairs can be moved arbitrarily as a whole, including the legs, and these chairs have been proposed with various functions such as height adjustment, rotation, and backrest angle adjustment.

[0004] Recently, the amount of time that modern people spend sitting in chairs has gradually increased. Accordingly, when sitting in a chair for a long time, the load of the upper body is concentrated on the sacrum and hip joints, and pain and numbness are induced by the force applied to the hard rigid seat pan of the chair. As a result, users change the sitting posture to reduce the pain, thereby causing a poor posture to continue, which may result in strain on the lower back or cause diseases such as scoliosis. When the buttocks are pressed in close contact with the seat pan, seating becomes uncomfortable, metabolism cannot proceed smoothly, skin color changes, and keratin buildup occurs, which is detrimental to health and aesthetics.

[0005] According to existing chairs the part that supports the user's back and the part that supports the buttocks are not moved in a linked manner, so they are insufficient to provide ergonomic support for user's movement, and improvements in this regard are required.

[0006] Although a Curble chair has been disclosed in the related art, this is limited to being used as a floor chair in rooms or on the floor, or on existing chairs, and thus has limitations in being used as a general office chair or desk chair.

[0007] The above description is the background for helping understand the present disclosure and does not means the related art well known in the art.SUMMARY

[0008] Therefore, an objective of the present disclosure is to provide a chair of which the position angle is automatically adjusted from a case in which a user performs intensive work to an angle at which the user can lie down and rest, by operating in response to the user's movement.

[0009] According to an aspect of the present disclosure, there may be provided a chair that includes: a chair body having a base frame; a first support part provided at the base frame, and configured to move in response to user's movement while supporting the user's hips and back; and a second support part provided at the base frame, and configured to support the first support part and move in coordination with a back support body of the first support part when the first support part is moved, wherein the second support part supports rolling of a hip support body of the first support part and elastically supports the back support body of the first support part.

[0010] The first support part may include: the hip support body movably provided at the base frame and configured to support user's hips; the back support body connected to the hip support body, and supported by the second support part while supporting a user's back; and a rotation guide member rotatably coupled to the back support body, and configured to guide rotation of the first support part by being guided by a guide arm provided at the second support part.

[0011] The second support part may include: a base support body supporting the back support body; a connecting plate having one side coupled to the base frame and an other side connected to the base support body; a guide arm provided on the connecting plate and configured to guide movement of the back support body; and a first elastic support part provided at the base support body and configured to elastically support the back support body.

[0012] The chair may further include: a leg support part movably provided at the base frame and configured to support user's legs; and a center-of-gravity shifting part provided at the second support part and configured to control movement of a center of gravity of the first support part.

[0013] Further, according to another aspect of the present disclosure, there may be provided a chair that includes: a chair body having a base frame and a base support arm provided at the base frame; a first support part spaced apart from the base frame, and configured to move in response to user's movement while supporting the user's hips and back; and a second support part disposed between the base frame and the first support part, and configured to support the first support part and move in coordination with a back support body of the first support part when the first support part moves, wherein when the back support body and a base support body of the second support part tilt backward, the first support part and the second support part move forward.

[0014] The first support part may include: a base roller rotatably provided at the base support arm; and at least one base support roller rotatably provided at the base frame and configured to support a connecting plate of the second support part, and the second support part may further include a roller member provided at the base support body, connected to the base roller, and configured to prevent the base roller from disengaging from the base support body.

[0015] The chair may further include a lumbar support provided at the back support body and configured to support a user's back, wherein the lumbar support may prevent interference with the user's back by moving backward when the back support body tilts backward.

[0016] According to an aspect of the present disclosure, there may be provided a chair that includes: a chair body having a base frame; a first support unit disposed at the base frame and configured to support user's hips and back; and a second support unit provided at the base frame and configured to support the first support unit, wherein when the first support unit tilts backward, a region of the second support unit which supports user's hips moves forward.

[0017] The first support unit may include: a first hip support part disposed at an upper portion of the base and configured to support a region of the second support unit which supports user's hips; a first back support part connected to the first hip support part and configured to support to the user's back; and a first elastic support part provided at the first back support part and configured to be elastically supported by the second support unit in a region corresponding to the first back support part when the first back support part tilts backward.

[0018] The second support unit may include: a second hip support part movably supported by the base frame and coupled with the first hip support part; a second back support part rotatably coupled to the chair body and connected to the second hip support part; and a stopper provided at the second hip support part and configured to restrict movement of the second hip support part.

[0019] The second hip support part may include: a second hip support body of which an upper portion is detachably coupled with a first hip support body of the first hip support part; and a second hip support frame movably coupled in a front-rear direction of the base frame and detachably coupled with the second hip support body, wherein the chair body may further include a body elastic support part provided at the base frame and elastically supporting movement of the second hip support frame.

[0020] The chair may further include a lumbar support part provided at a first back support part of the first support unit and configured to support a user's lumbar.

[0021] The embodiments of the present disclosure can provide a chair of which the position angle is automatically adjusted from a case in which a user performs intensive work to an angle at which the user can lie down and rest, by moving in response to the user's movements.

[0022] Further, since the hip support body and the back support body move in response to user's movement, it is possible to more efficient support the user's back and hip regions.

[0023] Furthermore, since when the first support part tilts, the second support part supports the first support part and is supported by the third support part, smooth movement can be achieved and tilting can also be smoothly achieved.

[0024] Further, when the back support body and the base support body tilt backward, the center of gravity shifts due to the forward movement of the center-of-gravity shifting part or, the first support part and the second support part, whereby it is possible to prevent the risk of the chair tipping over.BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a side view schematically showing a chair according to an embodiment of the present disclosure;

[0026] FIG. 2 is an exploded side view schematically showing the state in which a first support part shown in FIG. 1 has been separated from a second support part;

[0027] FIG. 3 is a view illustrating the operation of a lumbar support shown in FIG. 1 and schematically illustrating the state in which a support moving part has been operated and the lumbar support has been moved backward by rotation of a rotation guide member;

[0028] FIG. 4 is an enlarged view of the region of the lumbar support shown in FIG. 3;

[0029] FIG. 5 is another embodiment of the lumbar support shown in FIG. 3;

[0030] FIG. 6 is a view schematically illustrating the state in which the first support part and the second support part shown in FIG. 1 have been tilted backward;

[0031] FIG. 7 is view illustrating the operation of the present embodiment and schematically illustrating the process in which a back support body supported by a base support body is tilted;

[0032] FIG. 8 is a view schematically illustrating a center-of-gravity shifting part of the present embodiment;

[0033] FIG. 9 is a view schematically illustrating the operation of the center-of-gravity shifting part shown in FIG. 8;

[0034] FIG. 10 is a view schematically illustrating a support plate shown in FIG. 1;

[0035] FIG. 11 is a side view schematically illustrating a chair according to another embodiment of the present disclosure;

[0036] FIG. 12 is a view schematically illustrating the state in which a back support body and a base support body shown in FIG. 11 have been tilted backward, and a hip support body and a connecting plate have been moved forward; and

[0037] FIG. 13 is an enlarged view schematically illustrating the region of a base roller shown in FIG. 11.

[0038] FIG. 14 is a perspective view schematically showing a chair according to an embodiment of the present disclosure.

[0039] FIG. 15 is a rear perspective view of FIG. 14.

[0040] FIG. 16 is a right side view of FIG. 14.

[0041] FIG. 17 is a rear view of FIG. 14.

[0042] FIG. 18 is a view illustrating main parts of FIG. 14.

[0043] FIG. 19 is a left side view of FIG. 18.

[0044] FIG. 20 is a perspective view illustrating a first support unit and a lumbar support part shown in FIG. 18.

[0045] FIG. 21 is a front view of FIG. 20.

[0046] FIG. 22 is an enlarged perspective view illustrating a first elastic support part shown in FIG. 20.

[0047] FIG. 23 is a perspective view illustrating a second support unit shown in FIG. 18.

[0048] FIG. 24 is a right side view of FIG. 23.

[0049] FIG. 25 is an exploded perspective view illustrating the stopper part shown in FIG. 23.

[0050] FIG. 26 is a perspective view illustrating the configuration excluding the second hip support body shown in FIG. 23.

[0051] FIG. 27 is a plan view of FIG. 26.

[0052] FIG. 28 is a perspective view illustrating the configuration excluding the second lever and the third lever shown in FIG. 26.

[0053] FIG. 29 is an exploded perspective view illustrating that the second hip support frame shown in FIG. 28 has been separated from the base frame.

[0054] FIG. 30 is a perspective view illustrating the usage state of the present embodiment, that is, a user sitting on the chair.

[0055] FIG. 31 is a perspective view illustrating the user shown in FIG. 30 reclining backward.DETAILED DESCRIPTION

[0056] It is required to refer to the accompanying drawings exemplifying preferred embodiments of the present disclosure and the contents in the accompanying drawings to help sufficiently understand the present disclosure, the operational advantages of the present disclosure, and the objectives that are achieved by implementing the present disclosure.

[0057] Hereinafter, the present disclosure will be described in detail by describing exemplary embodiments of the present disclosure with reference to the accompanying drawings. Like reference numerals given in the drawings indicate like components.

[0058] FIG. 1 is a side view schematically showing a chair according to an embodiment of the present disclosure, FIG. 2 is an exploded side view schematically showing the state in which a first support part shown in FIG. 1 has been separated from a second support part, FIG. 3 is an operational view of a lumbar support shown in FIG. 1 and schematically shows the state in which a support moving part has been operated and the lumbar support has been moved backward by rotation of a rotation guide member, FIG. 4 is an enlarged view of the region of the lumbar support shown in FIG. 3, and FIG. 5 is another embodiment of the lumbar support shown in FIG. 3.

[0059] Further, FIG. 6 is a view schematically illustrating the state in which the first support part and the second support part shown in FIG. 1 have been tilted backward, FIG. 7 is view illustrating the operation of the present embodiment and schematically illustrating the process in which a back support body supported by a base support body is tilted, FIG. 8 is a view schematically illustrating a center-of-gravity shifting part of the present embodiment, FIG. 9 is a view schematically illustrating the operation of the center-of-gravity shifting part shown in FIG. 8, and FIG. 10 is a view schematically illustrating a support plate shown in FIG. 1.

[0060] As shown in the figures, a chair according to the present embodiment includes: a chair body 100 having a base frame 110; a first support part 200 provided at the base frame 110, and moving in response to user's movement while supporting the user's hips and back; a second support part 300 provided at the base frame 110, elastically supporting the first support part 200, and moving in coordination with a back support body 220 of the first support part 200 when the first support part 200 is moved; a third support part 400 connected to the second support part 300, elastically supporting a base support body 310 of the second support part 300; and a center-of-gravity shifting part 500 provided at the base frame 110 and the second support part 300 and controlling shifting of the first support part 200.

[0061] The chair body 100 includes, as shown in FIG. 1, a base frame 110, a support post 120 supporting the lower surface of the base frame 110, a plurality of support legs 130 provided at the support post 120, and a plurality of wheel members 140 provided at the plurality of support legs 130.

[0062] A leg support part provided at the chair body 100 extends forward from the chair body 100 and can support the user's leg region.

[0063] In the present embodiment, the leg support part includes a load sensor provided at the hip support body 210 or the base frame 110 and detecting a user's load, and a driving unit provided at the base frame 110, and extending the leg support member forward or returning it to its original position. In the present embodiment, the driving unit may include a known driving part including a cylinder or a motor.

[0064] In the present embodiment, the leg support part can be controlled to operate only when the first support part 200 tilts backward relative to the chair body 100.

[0065] The first support part 200 is provided at the base frame 110 and can move in response to user's movement while supporting the user's hips and back.

[0066] In the present embodiment, the first support part 200 includes, as shown in FIG. 1: a hip support body 210 movably provided at the base frame 110 and supporting user's hips; a back support body 220 connected to the hip support body 210 and supported by the second support part 300 while supporting a user's back; a rotation guide member 230 rotatably provided at the back support body 220 and guiding tilting of the back support body 220; and a support moving part 240 provided at the back support body 220 to be connected to the rotation guide member 230 and moving a lumbar support 221 provided at the back support body 220.

[0067] The hip support body 210 of the first support part 200 supports user's hips and, as shown in FIG. 1, includes a support plate 211 and a body hole 212 provided through the side walls of the hip support body 210 and supporting guide rollers 321 of the second support part 300 on the side walls of the hip support body 210.

[0068] In the present embodiment, the support plate 211, which directly supports user's hips, as shown in FIG. 10, includes a flat portion 211a and a curved portion 211b convexly curved from an end of the flat portion 211a toward the support leg 130.

[0069] In the present embodiment, when the first support part 200 tilts backward, the flat portion 211a that supports user's hips is placed on a connecting plate 320, so that the rotation guide member 230 can be smoothly engaged with a guide arm 330.

[0070] In the present embodiment, the flat portion 211a may be provided in a region adjacent to the back support body 220 of the first support part 200.

[0071] In the present embodiment, the curved portion 211b comes in contact with support rollers 241, guide rollers 321, a support plate 410, and support balls 343 and 423 of elastic support parts 340 and 420, which are disposed on the first support part 200, the second support part 300, and the third support part 400, and these rollers and elastic support structures move along or support the curved portion 211b, whereby movement of the hip support body 210 is guided stably. When a user adjust the tilt by tilting the back support body 220 backward, the curvature of the curved portion 211b allows the motion transmitted through the rotation guide member 230, the support moving part 240, and a guide arm 330 to be applied smoothly to the seat, so that the seat can move along a natural path in a complex manner rather than simply rotating.

[0072] In particular, the curved portion 211b, which is a main structure that transmits the load from the seat to the base roller 160 and the base support roller 170 formed on the base frame 110, as well as to a guide mechanism over the support post 120, and functions as a buffer that distributes the seating load so that it is not concentrated at a specific point. When a user applies weight, the load is stepwise distributed at the contact points between the curved portion 211b, the support rollers 241, and the guide rollers 321, and elastic springs 344 and 424 of the first elastic support part 340 and the second elastic support part 420 absorb the impact while deforming along the curvature of the curved portion. Accordingly, the instantaneous impact generated when seated is smoothly transmitted to the hip support body 210 and the entire support structure, thereby enhancing the overall stability and seating comfort of the chair.

[0073] Further, the curved surface shape of the curved portion 211b also serves as an initial contact surface where the tilt of the seat begins. For example, when the rotation guide member 230 or the support moving part 240 starts to lift or move the seat, they first come into contact with the forward sloped surface of the curved portion, which naturally forms the rotational center of the seat and helps initiate the tilting motion smoothly. This structure contributes to providing natural posture changes that match a user's body when the lumbar support 221 and the back support body 220 move together with a linkage mechanism.

[0074] Further, in the present embodiment, a pair of guide rollers 321 may be provided at the side wall of the hip support body 210, in which the body hole 212 is formed, as shown in FIG. 1. In the present embodiment, the pair of guide rollers 321 can support the hip support body 210 when the hip support body 210 tilts so that the hip support body 210 can stably tilt.

[0075] The back support body 220 of the first support part 200, which supports a user's back, can move together with the hip support body 210 in response to user's movement.

[0076] In the present embodiment, the lumbar support 221 that supports a user's lumbar region may be provided at the back support body 220, as shown in FIG. 1. In the present embodiment, the lumbar support 221 is moved backward by the support moving part 240 when the back support body 220 tilts backward, as shown in FIG. 7, whereby it is possible to minimize discomfort of a user's back due to pressing by the lumbar support 221 in a reclined position.

[0077] Further, in the present embodiment, the lumbar support 221 may be directly connected to the support moving part 240, as shown in FIG. 5, and operated thereby. That is, the connecting member 242, which connects the rotation guide member 230 and the pair of support rollers 241, is connected to the lumbar support 221 rather than the back support body 220, whereby it is possible to move the lumbar support 221 forward and backward.

[0078] The rotation guide member 230 of the first support part 200 is rotatably coupled to the back support body 220, and is supported by the guide arm 330 provided at the second support part 300 and can be moved together with the back support body 220 when the first support part 200 tilts backward.

[0079] In this embodiment, the rotation guide member 230 has a plurality of gear teeth, which can mesh with gear teeth provided at the guide arm 330.

[0080] Further, in the present embodiment, the rotation guide member 230 may be connected by the connecting member 242 to the plurality of support rollers 241 provided at the back support body 220.

[0081] The support moving part 240 of the first support part 200, as shown in FIG. 3, includes: a pair of support rollers 241, one of which is rotatably coupled to the upper end of the lumbar support 221 and the other of which is disposed higher; and a connecting member 242 that connects the pair of support rollers 241, the back support body 220, and the rotation guide member 230 and transmits the rotational force of the rotation guide member 230 to the lumbar support 221 to adjust the extent of protrusion of the lumbar support 221.

[0082] In the present embodiment, the rotational force of the rotation guide member 230 is transmitted to the connecting member 242, and the connecting member 242, as shown in FIG. 3, is connected to the upper end of the lumbar support 221, so it is possible to move the lumbar support 221 backward. Accordingly, in a reclined posture of a user, the protruding portion of the lumbar support 221 forward from the front of the back support body 220 is almost removed, whereby it is possible to prevent the discomfort of the user's back due to interference, that is, pressing by the lumbar support 221.

[0083] The second support part 300 is provided at the base frame 110 and elastically supports the first support part 200, and, when the first support part 200 is moved, as shown in FIG. 7, some components can move in coordination with the back support body 220 of the first support part 200.

[0084] In the present embodiment, the second support part 300, as shown in FIG. 1, includes: a base support body 310 that supports the back support body 220 of the first support part 200; a connecting plate 320 of which one side is coupled to the base frame 110 and the other side is connected to the base support body 310; a guide arm 330 that is provided at the connecting plate 320 and guides movement of the base support body 310 and movement of the back support body 220; a first elastic support part 340 that is provided at the base support body 310 and elastically supports the back support body 220, and a head support part 350 that is provided at the base support body 310 and supports a user's head.

[0085] The base support body 310 of the second support part 300 can be moved to tilt backward together with the back support body 220, as shown in FIG. 6.

[0086] The connecting plate 320 of the second support part 300 may have one side coupled to the base frame 110 and the other side on which the base support body 310 is provided to be inclined backward.

[0087] In the present embodiment, the connecting plate 320 may be directly connected to the base support body 310 and the base support body 310 may have elasticity, whereby the base support body 310 may be moved to tilt backward, or it may be connected to the back support body 220 through the guide arm 330.

[0088] Further, in the present embodiment, gear teeth are provided at the lower surface of the connecting plate 320, as shown in FIG. 2, and the gear teeth mesh with the driving gear 530 of the center-of-gravity shifting part 500. As a result, when the center of gravity is shifted and the driving gear 530 is operated, the chair body 100 can be moved backward, as shown in FIG. 9. In the present embodiment, the chair body 100 may be maintained at the position while the other components may be moved. Meanwhile, when the external force applied to the second support part 300 is removed in a reclined position, the hip support body 210 slides on the connecting plate 320, whereby the second support part 300 and the first support part 200 can be returned to their original positions before rotation.

[0089] Further, in the present embodiment, as shown in FIGS. 1 and 2, guide rollers 321 may be provided at the connecting plate 320. In the present embodiment, the guide rollers 321 are rotatably provided at the side of the connecting plate 320, so it is possible to stably and smoothly support the hip support body 210 when the first support part 200 tilts backward or returns to the original position. That is, in the present embodiment, the guide rollers 321 are arranged in contact with the region of the hip support body 210 having the body hole 212, so it is possible to support the hip support body 210. In the present embodiment, a pair of guide rollers 321 may be provided spaced apart on the side of the base frame 110.

[0090] The guide arm 330 of the second support part 300 is provided at the connecting plate 320 and may guide movement of the rotation guide member 230 and may also guide the base support body 310 to tilt backward when the first support part 200 tilts backward.

[0091] In the present embodiment, the guide arm 330 may be provided at both sides of the connecting plate 320, and may have gear teeth and mesh with the rotation guide member 230.

[0092] The first elastic support part 340 of the second support part 300, as shown in FIG. 3, is provided at the base support body 310 and can elastically support the back support body 220 that tilts.

[0093] In the present embodiment, the first elastic support part 340, as shown in FIG. 3, includes: a first support block 341 provided at the base support body 310; a first elastic support rod 342 rotatably coupled to the first support block 341; a first support ball 343 provided at the first elastic support rod 342 and supporting the back support body 220; and a first spring member 344 having one side provided at the base support body 310 and the other side connected to the first elastic support rod 342, and supporting the first elastic support rod 342.

[0094] In the present embodiment, before the back support body 220 tilts backward, the first support ball 343 of the first elastic support part 340 and the back support body 220 are spaced apart from each other, as shown by the dotted lines in FIG. 7. In this state, when user's load is applied to the back support body 220, the back support body 220 tilts backward, and when the load continues to be applied to the back support body 220, the back support body 220 comes into contact with the first support ball 343, and the elastic spring 344 contracts. As the load continues to be applied to the back support body 220, the first support ball 343 also comes into contact with the back base support body 310, so that the back support body 220 and the base support body 310 tilt backward together and can reach the solid-line state shown in FIG. 7. In this state, the second elastic spring 344 of the second support part 300 is also contracted.

[0095] The head support part 350 of the second support part 300 is provided at the upper portion of the base support body 310, as shown in FIG. 1, and can support a user's head or neck.

[0096] The third support part 400, as shown in FIG. 2, elastically supports the second support part 300, and, as shown in FIG. 2, includes a support plate 410 coupled to the connecting plate 320, and a second elastic support part 420 having one side coupled to the support plate 410 and the other side coupled to the base support body 310, and elastically supporting the base support body 310.

[0097] In the present embodiment, the second elastic support part 420, as shown in FIG. 1, includes: a second support block 421 provided at the support plate 211; a second elastic support rod 422 rotatably coupled to the second support block 421; a second support ball 423 provided at the second elastic support rod 422 and supporting the back support body 220; and a second elastic spring 424 having one side provided at the base support body and the other side connected to the second elastic support rod 422, and supporting the second elastic support rod 422.

[0098] When the user shifts the center of gravity of the chair by leaning backward or otherwise, the center-of-gravity shifting part 500 can move the center of gravity of the chair to correspond to the shifted center of gravity

[0099] In the present embodiment, the center-of-gravity shifting part 500, as shown in FIG. 8, includes: a first pressure sensor 510 provided at the connecting plate 320 and detecting pressure applied to the connecting plate 320; a second pressure sensor 520 provided at the connecting plate 320, spaced apart from the first pressure sensor 510, and detecting pressure applied to the connecting plate 320; and a driving gear 530 rotatably provided at the base frame 110 and moving the second support 300 by meshing with the gear teeth provided at the lower surface of the connecting plate 320.

[0100] In the present embodiment, the first pressure sensor 510, as shown in FIG. 8, is disposed between a guide roller 321 and a guide arm 330, and the second pressure sensor 520 may be disposed between the pair of guide rollers 321.

[0101] In the present embodiment, the driving gear 530 may be connected to and rotated by a driving unit, for example, a driving motor, provided at the base frame 110.

[0102] Although FIG. 9 illustrates the chair body 100 being moved, the present disclosure is not limited thereto, and the second support 300 may be configured to move.

[0103] FIG. 11 is a side view schematically illustrating a chair according to another embodiment of the present disclosure, FIG. 12 is a view schematically illustrating the state in which a back support body and a base support body shown in FIG. 11 have been tilted backward, and a hip support body and a connecting plate have been moved forward, and FIG. 13 is an enlarged view schematically illustrating the region of base rollers shown in FIG. 11.

[0104] A chair 1a according to the present embodiment, as shown in FIG. 11, differs from the above-described embodiment in that the structure is simplified and, safety is ensured by shifting the center of gravity in tilting using a mechanical mechanism.

[0105] A chair body 100a, as shown in FIG. 11, has a base support arm 150 protruding upward from the rear end of a base frame 110a, and a base roller 160 is rotatably coupled to the upper portion of the base support arm 150.

[0106] In the present embodiment, the structure in which the base roller 160 and the roller member 360 are connected to a connecting part can perform an anti-disengagement function to prevent the base support body 310 from disengaging when the base support body 310 tilts. Further, the base support body 310 can be naturally tilted by rolling friction between the base support body 310 and the base roller 160.

[0107] In the present embodiment, a plurality of base support rollers 170 is provided spaced apart on the upper surface of the base frame 110, as shown in FIG. 12, whereby the forward and backward movement of the connecting plate 320 can be guided.

[0108] The roller member 360 may be provided at the base support body 310 of the second support part 300 (300a), as described above.

[0109] The lumbar support 221 of the present embodiment and the above-described embodiment may be disposed with most of it behind the back support body 220, as shown in FIG. 14.

[0110] FIG. 14 is a perspective view schematically illustrating a chair according to an embodiment of the present disclosure, FIG. 15 is a rear perspective view of FIG. 14, FIG. 16 is a right side view of FIG. 14, FIG. 17 is a rear view of FIG. 14, FIG. 18 is a view illustrating main parts of FIG. 14, and FIG. 19 is a left side view of FIG. 18.

[0111] FIG. 20 is a perspective view illustrating a first support unit and a lumbar support part shown in FIG. 18, FIG. 21 is a front view of FIG. 20, FIG. 22 is an enlarged perspective view illustrating a first elastic support part shown in FIG. 20, FIG. 23 is a perspective view illustrating a second support unit shown in FIG. 18, FIG. 24 is a right side view of FIG. 23, and FIG. 25 is an exploded perspective view illustrating the stopper part shown in FIG. 23.

[0112] Further, FIG. 26 is a perspective view illustrating the configuration excluding the second hip support body shown in FIG. 23, FIG. 27 is a plan view of FIG. 26, FIG. 28 is a perspective view illustrating the configuration excluding the second lever and the third lever shown in FIG. 26, FIG. 29 is an exploded perspective view illustrating that the second hip support frame shown in FIG. 28 has been separated from the base frame, FIG. 30 is a perspective view illustrating the usage state of the present embodiment, that is, a user sitting on the chair, and FIG. 31 is a perspective view illustrating the user shown in FIG. 30 reclining backward.

[0113] As shown in these figures, a chair 1b according to the present embodiment includes: a chair body 1000 having a base frame 1100; a first support unit 2000 disposed on the base frame 1100 and supporting user's hips and back; a second support unit 3000 provided at the base frame 1100 and supporting the first support unit 2000; a lumbar support part 4000 provided at a first back support part 2200 of the first support unit 2000 and supporting a user's lumbar, and a lever part 5000 provided at the chair body 1000 and the second support unit 3000.

[0114] The chair body 1000, as shown in FIG. 15, includes: a base frame 1100; a support post 1200 supporting the lower surface of the base frame 1100; a plurality of support legs 1300 provided at the support post 1200; a plurality of wheel members 1400 provided at the plurality of support legs 1300; a base support arm 1500 provided behind the base frame 1100 and coupled with a second back support frame 3210 of the second support unit 3000 and a lumbar connecting link 4300 of the lumbar support part 4000; a body elastic support part 1600 provided at the base frame 1100 and elastically supporting movement of a second hip support frame 3120 of the second support unit 3000; a bending frame 1700 provided at the upper portion of the base frame 1100; a plurality of body support rollers 1800 coupled to the bending frame 1700 and supporting the side walls of the second hip support frame 3120; and a leg support part 1900 coupled to the front of the base frame 1100, and being lifted to support user's feet by the second hip support frame 3120 when the second hip support frame 3120 moves forward.

[0115] In the present embodiment, the body elastic support part 1600, which guides the second hip support frame 3120 to move in the longitudinal direction of the base frame, as shown in FIG. 15, includes a body elastic support body 1610 provided at the base frame 1100, a body elastic support shaft 1620 having one end coupled to the body elastic support body 1610, and a body spring 1630 coupled to the body elastic support shaft 1620.

[0116] The first support unit 2000, which directly supports user's back and hip regions, includes a first hip support part 2100 disposed at the upper portion of the base frame 1100 and supporting the region of the second support unit 3000 that supports user's hips, a first back support part 2200 connected to the first hip support part 2100 and supporting a user's back, and a first elastic support part 2300 provided at the first back support part 2200 and elastically supporting the second support unit 3000 in the region corresponding to the first back support part 2200 when the first back support part 2200 tilts backward.

[0117] The first hip support part 2100 of the first support unit 2000, which directly supports user's hips, as shown in FIG. 20, includes: a first hip support body 2110; a first support arm 2120 provided behind the first hip support body 2110; a lumbar support shaft 2130 provided at the first hip support body 2110 in the region where the first support arm 2120 is provided, and supporting the lumbar support part 4000; an anti-disengagement body 2140 provided at the side wall of the first hip support body 2110 and locking and supporting a stopper roller 3350 of a stopper part 3300; an anti-disengagement cover 2150 detachably coupled to the anti-disengagement body 2140 and blocking one side of a preventing hole 2141 provided at the anti-disengagement body 2140, and a first spring 2160 coupled to the lumbar support shaft 2130 and elastically supporting the first back support frame 2210.

[0118] In the present embodiment, the lower surface of the first hip support body 2110 can be supported on the upper portion of the second hip support body 3110 shown in FIG. 23 and can be locked and supported by the stopper roller 3350 of the stopper part 3300, whereby it can be prevented from disengaging.

[0119] The first back support part 2200 of the first support unit 2000 may be rotatably coupled to the lumbar support shaft 2130, as shown in FIG. 20.

[0120] In the present embodiment, the first back support part 2200, as shown in FIG. 20, includes a first back support frame 2210 rotatably coupled to the lumbar support shaft 2130, and a first back support body 2220 coupled to the first back support frame 2210.

[0121] In the present embodiment, a first lumbar protrusion hole may be provided at the first back support frame 2210, as shown in FIG. 22.

[0122] In the present embodiment, a second lumbar protrusion hole may be provided at the first back support body 2220, as shown in FIG. 1. In the present embodiment, the first lumbar protrusion hole 2211 and the second lumbar protrusion hole 2221 may communicate with each other so that, a lumbar support 4100 of the lumbar support part 4000 can move in the front-rear direction of the first back support body.

[0123] The first elastic support part 2300 of the first support unit 2000, as shown in FIG. 22, may be coupled to the rear of the first back support frame 2210 so that when the first back support frame 2210 tilts backward, the first back support body 2220 is smoothly supported by the second back support body.

[0124] In the present embodiment, the first elastic support part 2300, as shown in FIG. 22, includes a first elastic support shaft 2310 coupled to the upper rear of the first back support frame 2210, a first elastic support body 2320 rotatably coupled to the first elastic support shaft 2310, a first elastic spring 2330 having one side coupled to the first elastic support shaft 2310 and the other side supporting the inside of the first elastic support body 2320, and a first elastic support roller 2340 provided at the lower end of the first elastic support body 2320.

[0125] In the present embodiment, when the first back support part 2200 tilts toward the second back support part 3200 and comes into contact with the second back support frame 3210, the region of the first elastic support body 2320, to which the first elastic support roller 2340 shown in FIG. 22 is coupled, can move close to the first back support frame 2210 and elastically support the first back support part 2200.

[0126] The second support unit 3000 is provided at the base frame 1100, supports the first support part and, moves forward when the first back support part 2200 tilts backward, so the center of gravity shifts forward, whereby it is possible to prevent the chair body 1000 from tipping over.

[0127] In the present embodiment, the second support unit 3000, as shown in FIG. 26, includes a second hip support part 3100 that is movably supported on the base frame 1100 and to which the first hip support part 2100 is coupled, a second back support part 3200 rotatably coupled to the chair body 1000 and connected to the second hip support part 3100, and a stopper part 3300 provided at the second hip support part 3100 and restricting movement of the second hip support part 3100.

[0128] The second hip support part 3100 of the second support unit 3000, as shown in FIG. 25, includes a second hip support body 3110 and a second hip support frame 3120 detachably coupled to the lower portion of the hip support body and coupled to move in the front-rear direction of the base frame 1100.

[0129] In the present embodiment, as shown in FIG. 25, receiving grooves 3111 are respectively provided at both side walls of the second hip support body 3110, and the stopper part 3300 can be detachably coupled to receiving grooves 3111.

[0130] In the present embodiment, a plurality of first coupling members 3121 may be provided spaced apart at the upper portion of the second hip support frame 3120, as shown in FIG. 26. In the present embodiment, the plurality of first coupling members 3121 can be detachably coupled to the lower surface of the second hip support body 3110 using screws or bolts.

[0131] In the present embodiment, a moving guide hole 3122 may be provided in the second hip support frame 3120, as shown in FIG. 29. In the present embodiment, the moving guide hole 3122 may be provided in the longitudinal direction of the second hip support frame 3120, and may be provided as a pair spaced apart from each other. In the present embodiment, the body elastic support part 1600 may be exposed above the moving guide hole 3122, as shown in FIG. 28.

[0132] In the present embodiment, a pair of second coupling members 3123 may be provided spaced apart, behind the second hip support frame 3120, as shown in FIG. 29. In the present embodiment, the second coupling members 3123 may support the rear end of the body elastic support shaft 1620, as shown in FIG. 26. In the present embodiment, when the second hip support frame 3120 moves forward relative to FIG. 26, the body elastic support shaft 1620 may be exposed rearward of the second coupling members 3123 by the amount of movement of the second hip support frame 3120.

[0133] In the present embodiment, the second back support part 3200 of the second support unit 3000 has one side rotatably coupled to the base support arm 1500 and the other side rotatably coupled to the second hip support frame 3120, and can provide a force that can move the second hip support frame 3120 forward when the first back support part 2200 tilts backward, as shown in FIG. 16.

[0134] In the present embodiment, the second back support part 3200 includes a second back support frame 3210 of which the lower portion is rotatably coupled to the base support arm 1500, and a headrest 3220 provided at the upper end of the second back support frame 3210, as shown in FIG. 26.

[0135] In the present embodiment, a frame connecting link 3211 rotatably coupled to the second hip support frame 3120 may be provided at a lower end of the second back support frame 3210, as shown in FIG. 28. In the present embodiment, a first hole 3212 and a second hole 3213 may be provided at the second back support frame 3210, as shown in FIG. 28, a lumbar connecting link 4300 of the lumbar support part 4000 may be inserted into the first hole 3212 and a lumbar cover 4200 of the lumbar support part 4000 may be inserted into the second hole 3213. The lumbar cover 4200 inserted in the second hole 3213 may protrude rearward of the second back support frame 3210, as shown in FIG. 31.

[0136] Further, in the present embodiment, at the lower portion of the second back support frame 3210, as shown in FIG. 28, a sliding guide hole 3214 may be provided so that the lower portion of the second back support frame 3210 slides relative to the base support arm 1500.

[0137] In the present embodiment, the stopper 3300 of the second support unit 3000 is provided at the second hip support body 3110 and is locked and supported by the preventing hole 2141 of the anti-disengagement body 2140, whereby it is possible to prevent the second hip support body 3110 from disengaging.

[0138] In the present embodiment, the stopper 3300, as shown in FIG. 25, may include: a stopper body 3310 detachably coupled to the receiving groove 3111 of the second hip support body 3110 by screws or bolts; a stopper shaft 3320 with both ends coupled to the inner wall of the stopper body 3310; a stopper spring 3330 coupled to the stopper shaft 3320 to be extendable and contractible; a moving block 3340 movably coupled to the stopper shaft 3320 and elastically supported by the stopper spring 3330; and a stopper roller 3350 rotatably coupled to the moving block 3340 and locked and supported by the preventing hole 2141 of the anti-disengagement body 2140.

[0139] In the present embodiment, the moving block 3340 may be provided as a pair spaced apart from each other, as shown in FIG. 25, and the pair of moving blocks 3340 can be elastically supported by the stopper spring 3330.

[0140] The lumbar support part 4000, as shown in FIG. 20, is provided at the first back support part 2200 and can support a user's lumbar.

[0141] In the present embodiment, the lumbar support part 4000 includes: a plurality of lumbar supports 4100 protruding forward from the first back support body 2220, as shown in FIG. 1; a lumbar cover 4200 disposed behind the first back support frame 2210, supporting the plurality of lumbar supports 4100 to prevent the lumbar supports from disengaging, and protruding rearward of the second back support frame 3210 when the first back support frame 2210 tilts backward, as shown in FIG. 31; and a lumbar connecting link 4300 provided at a lower portion of the lumbar cover 4200 and rotatably coupled to the first support arm 2120, as shown in FIG. 20.

[0142] The lumbar pad 4100 is positioned between the first back support part 2200 and the first hip support part 2100, and is configured to actively respond to changes in a user's spinal curvature. The lumbar supports 4100 are controlled through the interaction of the first back support frame 2210, the first back support body 2220, the lumbar cover 4200, and the lumbar connecting link 4300, and particularly, implements an asymmetric curvature support mechanism that provides different support points, depending on the inclination of the first back support part 2200 and the posture of the seat.

[0143] In a standard sitting posture, the first back support frame 2210 is maintained nearly vertical, and in this case, the lumbar supports 4100 are pulled relatively forward by the link hole 4310 of the lumbar connecting link 4300, the first hole 3212 of the first back support frame, and the frame connecting link 3211. This forward pulling action causes the lumbar supports 4100 to move slightly upward and support a position somewhat higher than the center of the back support body 2220, thereby primarily supporting the thoracic region (middle and upper regions) rather than the lumbar region. That is, in the standard sitting posture, stable close-contact support force is provided to a user's upper back, thereby reducing fatigue when sitting for a long time.

[0144] In contrast, when the first back support part 2200 is reclined backward, the change in its inclination is transmitted to the entire first back support frame 2210, and accordingly, the movement of the lumbar connecting link 4300, which is linked to the sliding guide hole 3214, is shifted rearward and downward to the first back support frame 2210. Further, the restoring force of the elastic support roller 2340 and the first elastic support spring 2330 of the first elastic support part 2300 changes the rotational center of the back support body 2220, whereby the lumbar supports 4100 move along a path for moving lower and further rearward compared the previous position. As a result, when the first back support part 2200 is reclined, the lumbar supports 4100 move to a position where they directly support the lower portion of a user's spine, that is, the area where the lumbar curvature is formed.

[0145] This asymmetric behavior is not simple vertical movement, but a variable support mechanism produced by the combined action of the rotational center of the first back support frame 2210, the inclination of the sliding guide hole 3214, the link arrangement of the lumbar connecting link 4300, and the mechanical reaction force of the elastic support part 2300. Therefore, when a user takes a resting posture by reclining the chair, the lumbar supports 4100 naturally move to a position where they intensively support to the lumbar region, in the standard sitting posture, they transition a position where they stably supports the thoracic region.

[0146] In this embodiment, the lumbar connecting link 4300, as shown in FIG. 10, has a link hole 4310, and may be coupled to the first support arm through the link hole 4310. Further, in this embodiment, the link hole 4310 is formed in a curved shape, so it is possible to guide the lumbar connecting link 4300 to rotate along a semi-elliptical path.

[0147] The lever part 5000 includes a first lever 5100 provided at the first hip support part 2100, as shown in FIG. 2, and includes a second lever 5200 and a third lever 5300 provided at the second hip support part 3100, as shown in FIG. 27.

[0148] The embodiments of the present disclosure can provide a chair of which the position angle is automatically adjusted from a case in which a user performs intensive work to an angle at which the user can lie down and rest, by moving in response to the user's movement.DESCRIPTION OF REFERENCE NUMERALS1, 1a, 1b: chair

[0150] 100, 100a: chair body 110, 110a: base frame

[0151] 111: flat portion 112: curved portion

[0152] 120: support post 130: support leg 140: wheel member 150: base support arm

[0153] 160: base roller 170: base support roller

[0154] 200, 200a: first support part 210: hip support body

[0155] 211: support plate 211a: flat portion

[0156] 211b: curved portion 212: body hole

[0157] 220: back support body 221: lumbar support

[0158] 230: rotation guide member 240: pad moving part

[0159] 241: support roller 242: connecting member

[0160] 300: second support part 310: base support body

[0161] 320: connecting plate 321: guide roller

[0162] 330: guide arm 340: first elastic support part

[0163] 341: first support block 342: first elastic support rod

[0164] 343: first support ball 344: first elastic spring

[0165] 350: head support part 360: roller member

[0166] 400: third support part 410: support plate

[0167] 420: second elastic support part 421: second support block

[0168] 422: second elastic support rod 423: second support ball

[0169] 424: second elastic spring 500: center-of-gravity shifting part

[0170] 510: first pressure sensor 520: second pressure sensor

[0171] 530: driving gear

[0172] 1000: chair body 1100: base frame

[0173] 1200: support post 1300: support leg

[0174] 1400: wheel member 1500: base support arm

[0175] 1600: body elastic support part 1610: body elastic support body

[0176] 1620: body elastic support shaft 1630: body spring

[0177] 1700: bending frame 1800: body support roller

[0178] 1900: leg support part 2000: first support unit

[0179] 2100: first hip support part 2110: first hip support body

[0180] 2120: first support arm 2130: lumbar support shaft

[0181] 2140: anti-disengagement body 2141: preventing hole

[0182] 2150: anti-disengagement cover 2160: first spring

[0183] 2200: first back support part 2210: first back support frame

[0184] 2211: first lumbar protrusion hole 2220: first back support body

[0185] 2221: second lumbar protrusion hole 2300: first elastic support part

[0186] 2310: first elastic support shaft 2320: first elastic support body

[0187] 2330: first elastic spring 2340: first elastic support roller

[0188] 3000: second support unit 3100: second hip support part

[0189] 3110: second hip support body 3111: receiving groove

[0190] 3120: second hip support frame 3121: first coupling member

[0191] 3122: moving guide hole 3123: second coupling member

[0192] 3200: second back support part 3210: second back support frame

[0193] 3211: frame connecting link 3212: first hole

[0194] 3213: second hole 3214: sliding guide hole

[0195] 3220: headrest 3300: stopper part

[0196] 3310: stopper body 3320: stopper shaft

[0197] 3330: stopper spring 3340: moving block

[0198] 3350: stopper roller 4000: lumbar support part

[0199] 4100: lumbar support 4200: lumbar cover

[0200] 4300: lumbar connecting link 4310: link hole

[0201] 5000: lever part 5100: first lever

[0202] 5200: second lever 5300: third lever

[0203] The embodiments of the present disclosure can provide a chair of which the position angle is automatically adjusted from a case in which a user performs intensive work to an angle at which the user can lie down and rest, by moving in response to the user's movement.

Claims

1. A chair comprising:a chair body having a base frame;a first support part provided at the base frame, and configured to move in response to user's movement while supporting the user's hips and back; anda second support part provided at the base frame, and configured tosupport the first support part, andmove in coordination with a back support body of the first support part when the first support part is moved,wherein the second support part supports rolling of a hip support body of the first support part and elastically supports the back support body of the first support part.

2. The chair of claim 1, wherein the first support part includes:the hip support body movably provided at the base frame and configured to support user's hips;the back support body connected to the hip support body, and supported by the second support part while supporting a user's back; anda rotation guide member rotatably coupled to the back support body, and configured to guide rotation of the first support part by being guided by a guide arm provided at the second support part.

3. The chair of claim 1, wherein the second support part includes:a base support body supporting the back support body;a connecting plate having one side coupled to the base frame and another side connected to the base support body;a guide arm provided on the connecting plate and configured to guide movement of the back support body; anda first elastic support part provided at the base support body and configured to elastically support the back support body.

4. The chair of claim 1, wherein the chair body further includes:a leg support part movably provided at the base frame and configured to support user's legs; anda center-of-gravity shifting part provided at the second support part and configured to control movement of a center of gravity of the first support part.

5. A chair comprising:a chair body having a base frame and a base support arm provided at the base frame;a first support part spaced apart from the base frame, and configured to move in response to user's movement while supporting the user's hips and back; anda second support part disposed between the base frame and the first support part, and configured tosupport the first support part, andmove in coordination with a back support body of the first support part when the first support part moves,wherein when the back support body and a base support body of the second support part tilt backward, the first support part and the second support part move forward.

6. The chair of claim 5, wherein the chair body further includes:a base roller rotatably provided at the base support arm; andat least one base support roller rotatably provided at the base frame and configured to support a connecting plate of the second support part, andthe second support part further includes a roller member provided at the base support body, connected to the base roller, configured to prevent the base roller from disengaging from the base support body.

7. The chair of claim 5, further comprising a lumbar support provided at the back support body and configured to support a user's back,wherein the lumbar support prevents interference with the user's back by moving backward when the back support body tilts backward.

8. A chair comprising:a chair body having a base frame;a first support unit disposed at the base frame and configured to support user's hips and back; anda second support unit provided at the base frame and configured to support the first support unit,wherein when the first support unit tilts backward, a region of the second support unit which supports user's hips moves forward.

9. The chair of claim 8, wherein the first support unit includes:a first hip support part disposed at an upper portion of the base and configured to support a region of the second support unit which supports user's hips;a first back support part connected to the first hip support part and configured to support to the user's back; anda first elastic support part provided at the first back support part and configured to be elastically supported by the second support unit in a region corresponding to the first back support part when the first back support part tilts backward.

10. The chair of claim 9, wherein the second support unit includes:a second hip support part movably supported by the base frame and coupled with the first hip support part;a second back support part rotatably coupled to the chair body and connected to the second hip support part;and a stopper provided at the second hip support part and configured to restrict movement of the second hip support part.

11. The chair of claim 10, wherein the second hip support part includes:a second hip support body of which an upper portion is detachably coupled with a first hip support body of the first hip support part; anda second hip support frame movably coupled in a front-rear direction of the base frame and detachably coupled with the second hip support body,wherein the chair body further includes a body elastic support part provided at the base frame and elastically supporting movement of the second hip support frame.

12. The chair of claim 8, further comprising a lumbar support part provided at a first back support part of the first support unit and configured to support a user's lumbar.

13. The chair of claim 7, wherein the lumbar support primarily supports a thoracic region when the first support part is reclined rearward, and supports a lumbar region when the first support part is returned to an original position.

14. The chair of claim 1, further comprising a lumbar support provided at the back support body and configured to support a user's back,wherein the lumbar support prevents interference with the user's back by moving backward when the back support body tilts backward.

Images