Chair

Abstract

The present disclosure relates to a chair. In a chair, a support surface tilts the pelvis of a seated user. The rigid column includes a lower end and an upper end. An elastic body is arranged on the lower side of the support surface and generates a restoring force in all radial directions of the support surface according to an inclination angle of the support surface. The adjusting mechanism adjusts the magnitude of the restoring force of the elastic body. The rotary table is mounted on the upper side of the base and rotates around a height-direction shaft due to power. The support column is composed of a plurality of support columns mounted on the upper side of the rotating table, supports the support surface at the upper ends of the plurality of support columns when the support surface is inclined, and has different lengths in the height direction. The motor generates the power.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a chair. BACKGROUND

[0002] Japanese Unexamined Patent Application Publication No. 2003-235917 (JP 2003-235917 A) discloses a chair that induces movement of a user's torso by changing a support surface in an entire circumferential direction in a state in which the support surface is fixed to be inclined in a predetermined direction. Further, JP 2003-235917 A discloses a chair that generates inclination of a support surface in accordance with an inclination of a user by connecting a base and the support surface by a universal joint. SUMMARY

[0003] However, in the chair according to JP 2003-235917 A, the inclination of the support surface is fixed, and thus, it is expected that only a muscle for making a specific posture of the user is tightened. Further, in the chair, the inclination of the support surface is determined by the posture of the user, and thus, it is expected that the degree of activity of the muscle with respect to the inclination is limited. Therefore, the chair according to JP 2003-235917 A has a problem that it is not possible to activate a plurality of anti-gravity muscles required for maintaining a posture of the user while the user is not aware of the movement.

[0004] The present disclosure provides a chair that makes it possible to activate a plurality of anti-gravity muscles required for maintaining a posture of a user while the user is not aware of the movement.

[0005] One aspect of the present disclosure relates to a chair including a base, a support surface, a rigid column, an elastic body, an adjustment mechanism, a rotary table, a plurality of support columns, and a motor. The support surface is configured to incline a pelvis of a seated user. The rigid column includes a lower end portion fixed to the base and an upper end portion fixed to the support surface, such that the support surface is able to incline in all radial directions. The elastic body is disposed on a lower side of the support surface and is configured to generate a restoring force in all radial directions of the support surface in accordance with an inclination angle of the support surface. The adjustment mechanism is disposed between the elastic body and the base. Also, the adjustment mechanism is configured to adjust a magnitude of the restoring force of the elastic body. The rotary table is installed on an upper side of the base and is configured to rotate around a height direction axis due to a power. The plurality of support columns are installed on an upper side of the rotary table, are configured to support the support surface at upper end portions of the plurality of support columns when the support surface is inclined, and have different height direction lengths, and the motor is configured to generate the power.

[0006] In the chair of the above aspect, the elastic body can be a spring made of a metal, or can be a tubular member composed of a high elastic body.

[0007] In the chair of the above aspect, the elastic body can be arranged between the support surface and the adjustment mechanism so as to generate the restoring force in all radial directions of the support surface according to the inclination angle of the support surface, so that the central axis of the elastic body coincides with the central axis of the rigid column.

[0008] In the chair of the above aspect, the elastic body or multiple elastic bodies can be arranged in the circumferential direction of the rigid column between the support surface and the adjustment mechanism so as to generate the restoring force in all radial directions of the support surface according to the inclination angle of the support surface.

[0009] In the chair of the above aspect, the adjustment mechanism may be configured to adjust the magnitude of the restoring force of the elastic body by moving a surface of the adjustment mechanism along the rigid column, the surface of the adjustment mechanism abutting against the elastic body.

[0010] In the chair of the above aspect, the rigid column may include a D-shaped cut portion and a male thread portion arranged on the lower side of the D-shaped cut portion. The adjustment mechanism may include a support portion and a nut portion, the support portion including a through hole, the D-shaped cut portion being arranged in the through hole, and the nut portion being arranged around the male thread portion by a threaded connection. The elastomer may be arranged between the bearing surface and the support portion. The support portion may be attached to the rigid column in a state where the D-shaped cut portion is arranged in the through hole and the support portion is capable of moving along the D-shaped cut portion. The adjustment mechanism may adjust the magnitude of the restoring force of the elastomer by adjusting the amount of screwing of the nut portion relative to the male thread portion and moving the support portion along the D-shaped cut portion.

[0011] The chair in the above aspect may include a controller configured to increase or decrease a rotation speed of the motor.

[0012] With the chair of the above aspect, it is possible to induce effective trunk motion of a user sitting on the chair and reduce the load while allowing the user to maintain their posture.

[0013] The chair of the present disclosure enables activation of multiple anti-gravity muscles required to maintain the user's posture while the user is unaware of the movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals represent like elements, and wherein:

[0015] Figure 1 is a perspective view showing an exemplary configuration of a chair according to a first embodiment of the present disclosure;

[0016] Figure 2 is a side view showing an exemplary configuration of a support mechanism of a chair according to the first embodiment;

[0017] Figure 3 is a side view showing an exemplary configuration of a coupling column mechanism of a support mechanism of a chair according to the first embodiment;

[0018] Figure 4 is a side view showing an exemplary configuration of a support column of a chair according to the first embodiment;

[0019] Figure 5 is a diagram showing an exemplary configuration of a power transmission mechanism of a chair according to a first embodiment;

[0020] Figure 6 is a side view showing an exemplary configuration of a coupling column mechanism of a support mechanism of a chair according to a second embodiment of the present disclosure;

[0021] Figure 7 is a sectional view showing an exemplary configuration of a coupling column mechanism of a support mechanism of a chair according to a second embodiment;

[0022] Figure 8 is a side view showing an exemplary configuration of a coupling column mechanism of a support mechanism of a chair according to a third embodiment of the present disclosure;

[0023] Figure 9 is a top view showing an exemplary configuration of a coupling column mechanism of a support mechanism of a chair according to a third embodiment;

[0024] Figure 10 is a plan view showing an exemplary configuration of springs of a chair according to a third embodiment; and

[0025] Figure 11 is a plan view showing an exemplary configuration of springs of a chair according to a third embodiment. DETAILED DESCRIPTION

[0026] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the accompanying drawings, the same elements are represented by the same reference characters, and for the sake of clarity, repeated descriptions are omitted as needed.

[0027] First, we will use Figures 1 to 5 The configuration of the chair 100 according to the first embodiment will be described. Figure 1 : is a perspective view showing an exemplary configuration of a chair according to the first embodiment. Figure 1 As shown, the chair 100 includes a base 1 , a support surface 2 , a support mechanism 3 , a power transmission mechanism 4 , a motor 5 and a controller 6 .

[0028] The base 1 is a basic structure on which the components of the chair 100 are mounted. The support surface 2 is a support surface on which the user sits. The support surface 2 tilts the pelvis of the seated user.

[0029] The support mechanism 3 is a mechanism that is interposed between the base 1 and the support surface 2 and supports the support surface 2. When the user is not sitting on the support surface 2, the support mechanism 3 keeps the support surface 2 in a reference state. For example, the reference state is a state in which the support surface 2 is parallel to the horizontal plane (xy plane). When the user sits on the support surface 2, the support mechanism 3 allows the support surface 2 to tilt relative to the reference state, and further allows the direction of tilt to change over time around the height direction (z-axis direction). Specifically, the support mechanism 3 includes Figure 2 The structure shown.

[0030] Figure 2 1 is a side view showing an exemplary configuration of the support mechanism 3 of the chair 100 according to the first embodiment. Figure 2 As shown, the support mechanism 3 includes a coupling column mechanism 31, a rotating platform 32 and a plurality of support columns, namely, a support column 33a, a support column 33b and a support column 33c.

[0031] The connecting column mechanism 31 is a column mechanism that connects the base 1 and the supporting surface 2. Specifically, the connecting column mechanism 31 includes Figure 3 The structure shown. Figure 3 1 is a side view showing an exemplary configuration of the coupling column mechanism 31 of the support mechanism 3 of the chair 100 according to the first embodiment. Figure 3 As shown, the coupling column mechanism 31 includes a rigid column 311 , a ball joint 312 , a spring (elastic body) 313 and a jack (adjustment mechanism) 314 .

[0032] Rigid column 311 is a rigid member made of steel or the like that is difficult to elastically deform. Rigid column 311 includes a lower end fixed to base 1 . Furthermore, rigid column 311 includes an upper end fixed to support surface 2 , enabling support surface 2 to tilt in all radial directions. It is preferred that the central axis of rigid column 311 coincide with the center or center of gravity of support surface 2 .

[0033] The upper end of the rigid column 311 is fixed to the support surface 2 via a ball joint 312. This prevents translation of the support surface 2 (i.e., movement of the support surface 2 in the xy directions) while allowing freedom in the tilt angle of the support surface 2. The ball joint 312 is mounted very close to the upper surface of the support surface 2 (i.e., the location of the user's pelvis), thereby minimizing the amount of translational movement of the support surface 2 when tilting. Preferably, the center of rotation of the ball joint 312 is located within the support surface 2, for example, by drilling a hole through the bottom side of the support surface 2.

[0034] Spring 313 is arranged on the underside of support surface 2. Spring 313 is arranged between support surface 2 and jack 314 so as to generate a restoring force in all radial directions of support surface 2 according to the tilt angle of support surface 2. This restoring force is the force that acts to restore spring 313 after elastic deformation. A reference is provided for the predetermined amount of restoring force generated by spring 313, and spring 313 is arranged according to this reference. Specifically, spring 313 is arranged so that the amount (value) of the restoring force generated by spring 313 varies within a certain range between the tilt directions of support surface 2. In other words, spring 313 is arranged so that the amount of restoring force generated by spring 313 is approximately the same regardless of the tilt direction of support surface 2. In the first embodiment, spring 313 is arranged between support surface 2 and jack 314, so that rigid column 311 is arranged inside spring 313, and the central axis of spring 313 coincides with the central axis of rigid column 311. Preferably, the number of windings of spring 313 is set so that the amount of restoring force generated from spring 313 varies within a certain range between the tilting directions of support surface 2. In addition, for spring 313, a reaction force generating mechanism such as a shock absorber may be used.

[0035] Jack 314 is positioned between spring 313 and base 1. Rigid column 311 is inserted into jack 314. Jack 314 adjusts the magnitude of the restoring force of spring 313. Jack 314 can increase or decrease the initial value of spring 313 by moving the surface of jack 314 in the height direction, which abuts against spring 313. Jack 314 can adjust the magnitude of the restoring force against tilting of support surface 2 by applying pressure to spring 313.

[0036] The support surface 2 is allowed to tilt only around the pitch axis (y axis) and the roll axis (x axis). The spring 313 is coupled to the support surface 2, and the spring 313 is coupled to the jack 314 so that the support surface 2 does not rotate around the yaw axis (z axis).

[0037] In the chair 100, other elastic bodies may be used instead of the springs 313 as long as the isotropy of the restoring force against the tilt of the support surface 2 is substantially ensured. For example, a tubular elastomer may be used instead of the springs 313 made of metal.

[0038] Furthermore, in the chair 100, the length of the rigid column 311 may be adjustable so that the height of the support surface 2 can be adjusted according to the user's body shape. In that case, the chair 100 needs to include a mechanism capable of adjusting the length of the rigid column 311, independent of the jack 314 as an adjustment mechanism for adjusting the restoring force of the spring 313, and needs to include a configuration that enables the restoring force to be adjusted over the entire range in which the length of the rigid column 311 can be adjusted.

[0039] Will return to Figure 2 Description. The rotating table 32 includes a rotating portion 321, a gear portion 322, and a rotating base portion 323. The rotating portion 321 is, for example, a disc-shaped member, and is mounted on the rotating base portion 323 so as to rotate around the height direction (z-axis direction) axis as the gear portion 322 rotates. The gear portion 322 is, for example, a pulley interlocked with the rotating portion 321, and has an outer peripheral surface provided with teeth, to which a belt or the like for receiving power from the power transmission mechanism 4 is attached. In addition, the rotating table 32 includes a perforated portion (not shown) through which the coupling column mechanism 31 passes.

[0040] The support columns 33a, 33b and 33c are columnar members provided on the surface of the upper side (positive side of the z-axis) of the rotating portion 321 of the rotating table 32. When the user sits on the support surface 2 and the support surface 2 is tilted, the support columns 33a, 33b and 33c support the support surface 2 at the upper ends of the support columns 33a, 33b and 33c, respectively. A plurality of support columns, namely, the support columns 33a, 33b and 33c, are provided at regular intervals along a circle on the surface of the upper side of the rotating portion 321, but the place where each support column, namely, the support column 33a, 33b and 33c is provided may be set. Specifically, the support columns 33a, 33b and 33c include Figure 4 The structure shown.

[0041] Figure 4 This is a side view illustrating an exemplary configuration of support columns 33a, 33b, and 33c of chair 100 according to the first embodiment. Support column 33a includes an upper end portion 331a and a length adjustment portion 332a. Upper end portion 331a is, for example, a spherical member and supports support surface 2 when support surface 2 is tilted. By employing a spherical member as upper end portion 331a, rotating table 32 can be rotated with minimal resistance even when the user's load on support surface 2 is concentrated in the tilting direction. Length adjustment portion 332a is, for example, a screw-type member and adjusts the length of support column 33a.

[0042] Support column 33b has the same structure as support column 33a. That is, support column 33b includes an upper end portion 331b and a length adjustment portion 332b. Furthermore, support column 33c also has the same structure as support column 33a. That is, support column 33c includes an upper end portion 331c and a length adjustment portion 332c.

[0043] Will return to Figure 2Description. The height length of each of the multiple support columns (i.e., support column 33a, support column 33b, and support column 33c) is determined so that when the user is seated, the support surface 2 is tilted at a predetermined angle from the reference state. In order to produce the tilt, at least one of the multiple support columns (i.e., support column 33a, support column 33b, and support column 33c) is adjusted to be shorter in height than the other support columns in support column 33a, support column 33b, and support column 33c. For example, support column 33b is adjusted to be shorter in height than support column 33a. In other words, the length of support column 33b is adjusted so that the distance Lb between the upper end 331b of support column 33b and the lower side of support surface 2 is greater than the distance La between the upper end 331a of support column 33a and the lower side of support surface 2. In addition, support column 33b is adjusted to be shorter in height than support column 33c. The direction and angle of the allowable tilt of the support surface 2 are determined by the respective lengths of the support columns 33a, 33b and 33c. In addition, it is preferred that the upper end 331a of the support column 33a and the upper end 331c of the support column 33c contact the lower side of the support surface 2.

[0044] Will return to Figure 1 The power transmission mechanism 4 is composed of, for example, a belt and a pulley, or a chain and a sprocket, and transmits the power generated by the motor 5 to the rotating table 32 of the support mechanism 3. Specifically, the power transmission mechanism 4 includes Figure 5 The structure shown.

[0045] Figure 5 1 is a diagram showing an exemplary configuration of the power transmission mechanism 4 of the chair 100 according to the first embodiment. Figure 5 As shown, the power transmission mechanism 4 includes a motor 5 rotating at a reduction ratio of 25:1, an 11-tooth pulley, a 40-tooth pulley, a 28-tooth pulley, and a gear portion 322 of a rotating table 32 having 47 teeth, all of which are connected via a belt. In the power transmission mechanism 4, a high reduction ratio is required for very slow rotation, and therefore, a very high reduction ratio, i.e., a total reduction ratio of 1260:1, is employed.

[0046] Will return to Figure 1 Description. The motor 5 is, for example, an electric motor and generates power by rotating. The controller 6 controls the rotation of the motor 5. For example, the controller 6 can increase or decrease the rotation speed of the motor 5. The controller 6 can switch between increasing and decreasing the rotation speed of the motor 5 at predetermined intervals.

[0047] Next, exemplary actions of the chair 100 according to the first embodiment will be described. A user sits on the support surface 2 of the chair 100. In this case, the support surface 2 is supported by a plurality of support columns, that is, the support columns 33a, 33b, and 33c of the support mechanism 3. In a case where at least one of the plurality of support columns, that is, the support columns 33a, 33b, and 33c is shorter in length than the other support columns among the support columns 33a, 33b, and 33c, tilting of the support surface 2 is allowed. The direction and the angle of the allowed tilting of the support surface 2 are determined in accordance with the respective lengths of the plurality of support columns, that is, the support columns 33a, 33b, and 33c.

[0048] Also, the user operates the controller 6. The controller 6 controls the rotation of the motor 5 based on the user's operation. The motor 5 generates power based on the control of the controller 6, and transmits the generated power to the rotating stage 32 of the support mechanism 3 through the power transmission mechanism 4. The rotating portion 321 of the rotating stage 32 rotates around the height direction axis based on the transmitted power, and rotates the plurality of support columns, that is, the support columns 33a, 33b, and 33c mounted thereto in the same direction. Thereby, the direction in which the support surface 2 is allowed to tilt changes over time.

[0049] As described above, the chair 100 tilts the pelvis of the user in all radial directions of the support surface 2. The user activates the erector spinae muscle, which is a deep muscle of the trunk, so that the head position, that is, the line of sight is stabilized by the chair 100, and performs an involuntary movement so that the tilting of the pelvis is canceled. Therefore, when the user is just sitting, the chair 100 can induce the trunk movement by a movement that is an involuntary movement but is an active movement. That is, when the user is just sitting on the chair 100, a plurality of anti-gravity muscles required to maintain the posture of the user can be activated while the user is not aware of the movement.

[0050] Further, in order to activate the erector spinae muscle that does not initially generate a large displacement amount, the tilting angle of the support surface 2 can be small, and the small tilting angle suppresses excessive movement of the head. Therefore, in the chair 100, the tilting of the support surface 2 is unlikely to hinder desk work while sitting, such as typing with a personal computer or writing, and thus, the user can use the time for daily sitting work as health time without a change.

[0051] Furthermore, in the above concept, the inclination of the pelvis is important, and it is preferable that the user not move in the translation direction. Therefore, in the above configuration, a mechanism that allows only a change in the posture angle is required. The chair 100 includes a configuration in which the upper end portion of the rigid column 311 of the coupling column mechanism 31 is fixed to the support surface 2 by the ball joint 312. Therefore, the chair 100 avoids the translation of the support surface 2 (i.e., the movement of the support surface 2 in the xy direction), and imparts the freedom of the inclination angle of the support surface 2. That is, it is possible to allow only a change in the posture angle without moving in the translation direction.

[0052] Furthermore, when the posture angle is completely free, the inclination is biased in one direction due to the habit of the sitting posture of the sitter, so that the bad posture is worsened. Therefore, the support surface needs to receive a restoring force corresponding to the inclination. The necessary size of the restoring force differs depending on the weight of the user and the habit of the posture, and therefore, it is desirable that the restoring force can be easily adjusted and the load on the user can be adjusted while the user maintains the posture. The chair 100 includes a mechanism that adjusts the size of the restoring force using the spring 313 and the jack 314 of the coupling column mechanism 31. Therefore, the chair 100 can reduce the load while the user maintains the posture.

[0053] Next, the configuration of the chair 200 according to the second embodiment will be described using Figure 6 and Figure 7 . The chair 200 basically includes the same configuration as the chair 100 according to the first embodiment (the base 1, the support surface 2, the support mechanism 3, the power transmission mechanism 4, the motor 5, and the controller 6). However, the chair 200 includes an adjustment mechanism that adjusts the size of the restoring force of the spring 313 and is different from the adjustment mechanism of the chair 100 according to the first embodiment. Specifically, the chair 200 includes a coupling column mechanism 41 in the support mechanism 3 instead of the coupling column mechanism 31 compared to the chair 100. The configuration of the coupling column mechanism 41 of the support mechanism 3 of the chair 200 is specifically shown in Figure 6 and Figure 7 .

[0054] Figure 6 is a side view showing an exemplary configuration of the coupling column mechanism 41 of the support mechanism 3 of the chair 200 according to the second embodiment. Figure 7 is a cross-sectional view showing an exemplary configuration of the coupling column mechanism 41 of the support mechanism 3 of the chair 200 according to the second embodiment.

[0055] As Figure 6 and Figure 7As shown, the coupling column mechanism 41 of the chair 200 includes a rigid column 411 in place of the rigid column 311, and includes a support portion 4121 and a nut portion 4122 in place of the jack 314, in comparison with the coupling column mechanism 31 of the chair 100. Further, the coupling column mechanism 41 of the chair 200 includes the ball joint 312 and the spring 313, similarly to the coupling column mechanism 31 of the chair 100.

[0056] In addition to the above-described configuration of the rigid column 311, the rigid column 411 further includes a D-shaped cut portion 4111 and a male screw portion 4112 arranged on a lower side of the D-shaped cut portion 4111.

[0057] The support portion 4121 and the nut portion 4122 constitute an adjustment mechanism that adjusts the magnitude of the restoring force of the spring 313. The support portion 4121 includes a through-hole into which the D-shaped cut portion 4111 is inserted. The support portion 4121 is attached to the rigid column 411 in a state in which the D-shaped cut portion 4111 is inserted into the through-hole and the support portion 4121 is movable along the D-shaped cut portion 4111. The nut portion 4122 is disposed around the male screw portion 4112 by screwing. By adjusting the amount of screwing with respect to the male screw portion 4112, the nut portion 4122 moves the support portion 4121 along the D-shaped cut portion 4111, thereby adjusting the magnitude of the restoring force of the spring 313.

[0058] Next, the configuration of the chair 300 according to the third embodiment will be described using Figure 8 The chair 300 includes the same configurations as the chair 100 according to the first embodiment (the base 1, the support surface 2, the support mechanism 3, the power transmission mechanism 4, the motor 5, and the controller 6), but the configuration of the coupling column mechanism 31 of the support mechanism 3 is different.

[0059] Figure 8 is a side view showing an exemplary configuration of the coupling column mechanism 31 of the support mechanism 3 of the chair 300 according to the third embodiment. In the chair 100 according to the first embodiment, a single spring 313 is arranged, but in the chair 300 according to the third embodiment, a plurality of springs 313 are arranged as shown in Figure 8 A reference is provided for a predetermined amount of restoring force generated from the plurality of springs 313, and each of the plurality of springs 313 is arranged in accordance with the reference. Specifically, each of the plurality of springs 313 is arranged such that the total amount (total value) of the restoring force generated from the plurality of springs 313 varies within a certain range between the inclination directions of the support surface 2. In other words, each of the plurality of springs 313 is arranged such that the total amount of the restoring force generated from the plurality of springs 313 is substantially the same regardless of the inclination direction of the support surface 2. For example, each of the plurality of springs 313 is arranged as shown in Figure 9

[0060] Figure 9 ​3 is a top view showing an exemplary configuration of the coupling column mechanism 31 of the support mechanism 3 of the chair 300 according to the third embodiment. Figure 9 As shown, a plurality of springs 313 are arranged along a circle (shown by a dotted line in the figure) in the circumferential direction of the rigid column 311. The number of arranged springs 313 is not limited to Figure 9 The number of springs 313 may be four, or may be more than four. Preferably, the number of springs 313 arranged is three or more, because at least the support surface 2 can be supported as a flat surface. More preferably, the plurality of springs 313 are arranged at regular intervals in the circumferential direction of the rigid column 311.

[0061] Figure 10 and Figure 11 Each of them is a plan view showing an exemplary arrangement of the springs 313 of the chair 300 according to the third embodiment. Figure 10 As shown, the plurality of springs 313 are arranged symmetrically around the axis of the rigid column 311. Figure 10 In the embodiment, the change in the sum of the predetermined amount of restoring forces generated by the plurality of springs 313 may exceed a certain range between the case where the support surface 2 is tilted in the direction in which the springs 313 are present and the case where the support surface 2 is tilted in the direction in which the springs 313 are absent (i.e., in the direction of the gaps between the plurality of springs 313). Therefore, when the plurality of springs 313 are arranged in a symmetrical manner around the axis of the rigid column 311, it is preferable to arrange a sufficient number of springs 313 so that the change in the sum of the restoring forces is within a certain range. In addition, as Figure 11 As shown, it is preferable that each of the plurality of springs 313 is arranged on the opposite side of the gap in the direction in which the spring 313 does not exist, so that the spring 313 is not symmetrical around the axis of the rigid column 311 .

[0062] The present disclosure is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit.

Claims

1. A chair characterized by include: base; a support surface configured to tilt the pelvis of a seated user; a rigid column comprising a lower end fixed to the base and an upper end fixed to the support surface so that the support surface can tilt in all radial directions; an elastic body arranged on a lower side of the support surface and configured to generate a restoring force in all radial directions of the support surface according to an inclination angle of the support surface; an adjustment mechanism, disposed between the elastic body and the base and configured to adjust the magnitude of the restoring force of the elastic body; a rotating table mounted on an upper side of the base and configured to rotate around a height-direction axis due to power; a plurality of support columns installed on an upper side of the rotating table, configured to support the support surface at upper ends thereof when the support surface is inclined, and including different height-direction lengths; and An electric motor configured to generate said power.

2. The chair according to claim 1, characterized in that The elastic body is a spring made of metal.

3. The chair according to claim 1, wherein: The elastic body is a tubular component made of elastomer.

4. The chair according to any one of claims 1 to 3, characterized in that The elastic body is arranged between the support surface and the adjustment mechanism to generate the restoring force in all radial directions of the support surface according to the inclination angle of the support surface, so that the central axis of the elastic body coincides with the central axis of the rigid column.

5. The chair according to any one of claims 1 to 3, characterized in that The elastic body or the plurality of elastic bodies are arranged between the support surface and the adjustment mechanism in the circumferential direction of the rigid column so as to generate the restoring force in all radial directions of the support surface according to the inclination angle of the support surface.

6. The chair according to any one of claims 1 to 3, characterized in that The adjustment mechanism is configured to adjust the magnitude of the restoring force of the elastic body by moving a surface of the adjustment mechanism along the rigid column, the surface of the adjustment mechanism abutting against the elastic body.

7. The chair according to any one of claims 1 to 3, characterized in that: The rigid post includes a D-shaped cut portion and a male threaded portion disposed on a lower side of the D-shaped cut portion; The adjustment mechanism includes a support portion and a nut portion, the support portion includes a through hole, the D-shaped cutting portion is arranged in the through hole, and the nut portion is arranged around the male thread portion through a threaded connection; The elastic body is arranged between the bearing surface and the support portion; The support portion is attached to the rigid post in a state where the D-shaped cut portion is disposed in the through hole and the support portion is movable along the D-shaped cut portion; and The adjustment mechanism is configured to adjust the magnitude of the restoring force of the elastic body by adjusting the screwing amount of the nut portion relative to the male thread portion and moving the support portion along the D-shaped cut portion.

8. The chair according to any one of claims 1 to 3, characterized in that Also included is a controller configured to increase or decrease the rotational speed of the motor.

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