JP2005102983A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide chair having a simple structure and adjusted according to the body shape of a user for appropriate rocking effect. <P>SOLUTION: The chair comprises a chair body 2 with a seat part 5 as a rocking part and a backrest part 6, and a support body 4 for supporting the chair body 2 at a leg part 3. The support body 4 has a torsion bar 42 as an elastically deformable elastic support part. The leg part 3 is connected to part of the torsion bar 42, and the seat part 5 and the backrest part 6 are connected to the torsion bar 42 in such a way that the leg part 3 can be brought close to or separated from the torsion bar 42 when the leg part 3 is connected. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a swingable chair.

As a means for swinging the backrest and / or seat of the chair as a single unit with respect to the leg, a torsion bar is provided on the support connected to the upper side of the leg of the chair, and the end of the torsion bar In addition, there is known a structure in which a backrest portion and a seat portion are connected with a direction orthogonal to the length direction of the torsion bar as a front-rear direction. With such a chair, the torsion bar is twisted by the user sitting and the backrest part is urged backwards or the back part of the seat is urged downward, and the backrest part and the seat part are tilted and the urging is released. By doing so, it is possible to return from the tilted state to the initial state. (Hereinafter referred to as Conventional Example 1) (Patent Documents 1 and 2)
On the other hand, from the viewpoint of ergonomics, it is also known that the back portion and the seat portion of the chair swing with respect to the leg portion with a certain relationship instead of being integrated. As a typical example, a support body connected to the upper side of the leg portion is provided with a link mechanism for interlocking the backrest portion and the seat portion. In the case of such a chair, when the user sits and urges the backrest part backward, the seat part also tilts at a certain rate as the backrest part tilts backward, and the urging is released. As a result, both the backrest and the seat return from the tilted state to the initial state. (Hereinafter referred to as Conventional Example 2) (Patent Document 3)
No. 7-50986 JP-A-10-113244 Japanese Patent Laid-Open No. 11-253263

  However, in the chair as in Conventional Example 1, the swing mechanism can be mounted on the chair with a very simple configuration, but the swing width cannot be adjusted to obtain an appropriate swing effect according to the body shape of the user. There is.

  On the other hand, the chair as in Conventional Example 2 can be equipped with a swing mechanism that can flexibly respond to the seating posture of the user, but it is necessary to incorporate a link mechanism in the support body, which not only complicates the structure. In addition, since the space for the lower limbs is narrowed, there is a problem that it is restricted in terms of usability and design.

  Therefore, in view of the above problems, the present invention has a first object to configure a chair that is simple and can be adjusted so as to obtain an appropriate swinging effect according to the body shape of the user. In addition, the chair can be swung with respect to the legs with a certain relationship, not as a single unit, but with a plurality of swinging parts (for example, a backrest and a seat) that are simpler in structure. The second purpose is to do.

(Basic principle)
In order to achieve the above object, the present invention focuses on the characteristics of the torsion bar in the conventional example 1 and the like. (Note that this characteristic does not apply only to the torsion bar, and can be applied to other coil springs, for example. Details will be described later.)
Generally, when one end of a torsion bar is fixed and a specific torsional moment is applied to the other end, the torsion angle is directly proportional to the length of the torsion bar. In other words, the longer the torsion bar, the greater the torsion angle for the same load. This is substantially the same for the relationship between the interval and the torsion angle when an arbitrary part of the torsion bar is fixed and a load is applied to the other arbitrary part. That is, it can be said that the swinging width can be adjusted by making the point to which the load is applied to the torsion bar fixed partly variable in the length direction of the bar.

  Further, when attention is paid to the case where a load is applied to a plurality of points that differ in the length direction with respect to a torsion bar that is partially fixed, the following relationship holds regarding the relationship between the torsion angles at each point.

  FIG. 1 shows a case where a torsional moment in the same direction is applied to two different points in the length direction of the torsion bar T with one end fixed. It is assumed that a point A which is a part of the torsion bar T (an end portion in FIG. 1) is fixed to a support body (not shown).

  Now, point B, which is an arbitrary position in the longitudinal direction of torsion bar T, and point C, which is in the same direction as point B and further away from point A, are determined, and torsional moment MB is applied to point B. Further, the torsional moment MC is applied to the point C.

First, when the torsional moment MB is applied only to the point B, the torsion angle RB at the point B and the torsion angle RC at the point C become substantially equal values. At this time, the shear stress between point B and point C is substantially zero. (State in FIG. 1A) Further, when the torsional moment MC is applied to the point C in the same direction as the torsional moment MB with respect to the point B, the torsion angle RC at the point C further increases. (State of FIG. 1 (b))
Next, when the torsional moment MC is applied only to the point C, the torsion angle RB at the point B and the torsion angle RC at the point C are values proportional to the distance from the point A, respectively. That is, the torsion angle RB at point B and the torsion angle RC at point C are substantially equal. (The state of FIG. 1C) Further, when the torsional moment MB is applied to the point B in the same direction as the torsional moment MC with respect to the point C, the torsion angle RB at the point B and the torsion angle RC at the point C are both approximately. Increase by equal torsion angle. (State of FIG. 1 (d))
In other words, when a load is applied to a plurality of points that differ in the length direction with respect to a torsion bar that is partially fixed, the load is swung more greatly at a point farther from the point where the torsion bar is fixed, regardless of the weight distribution. In addition, it can be said that the load applied to one point affects the swinging width at another point with a certain relationship.

  On the other hand, as shown in FIG. 2, with both ends A and A ′ of the torsion bar T being fixed, a point C that is a central portion and points B and B that are respectively positioned between the ends A and A ′ and the point C Even when a load in the same direction is applied to each other, the torsion angle RC at the point C is always larger than the torsion angles RB and RB ′ at the points B and B ′. In this case, even if the load applied to the point C is 0, the torsion angle at the point C is always at least slightly larger than the torsion angles RB and RB ′ at the points B and B ′ due to the rigidity of the torsion bar T itself. It becomes.

  In the present invention, the above basic principle is applied to a swing mechanism of a chair.

In any of the above cases, it is important that the swinging width of the swinging part depends on the distance between the point where the torsion bar is fixed and the point where the swinging part is connected to the torsion bar. It is.
(Application to the present invention)
In order to solve the above-mentioned problems, the present invention comprises a chair body provided with a swinging portion and a support body that supports the chair body on a leg portion, and the support body is an elastically deformable elastic support portion. And the leg portion is connected to a part of the elastic support portion, while the swinging portion is connected to the elastic support portion so that the position thereof can be adjusted. In such a case, in order to adjust the swinging width of the swinging part, by changing the point where the swinging part is connected to the elastic support part, What is necessary is just to change the distance with a connection point with a rocking | fluctuation part, and it can make a rocking | fluctuation width adjustable according to a user's body shape, though it is a very simple structure.

  In that case, if the support is provided with a first stopper portion that allows the elastic support portion to be elastically deformed only in one direction in an unloaded state, it can only swing in one direction, and further, If the support is provided with a second stopper portion that restricts swinging beyond a certain angle, excessive tilting of the swinging portion can be prohibited, so that it more closely matches the characteristics of the chair. .

  Also, the elastic support portion is a rod-like body that can be twisted and restored in the rotational direction about the axis as a center line, that is, a torsion bar, and the leg portion and the swinging portion are respectively connected to different portions in the length direction of the rod-like body. For example, sliding means etc. can be used to adjust the position of the connecting point of the swinging part to the elastic support part, and the lower leg space can be further improved by arranging a torsion bar directly under the seat surface of the chair. It can also be widely used.

Furthermore, if the cross-sectional shape of the rod-shaped body is a polygon, it is possible to achieve both the smooth adjustment of the position and the rotation suppression of the connecting portion when a load is applied to the rocking body.
In such a chair, it is preferable that the swinging portion is specifically a backrest portion or a seat portion.

  On the other hand, a chair body provided with a plurality of swing parts and a support body that supports the chair body on the leg part, the support body comprising an elastic support part that can be elastically deformed, While the portion is connected to a part of the elastic support portion, the plurality of swinging portions can be chairs respectively connected to different portions of the elastic support portion. If this is the case, the positional relationship of the plurality of oscillating parts is different between the unloaded state and the loaded state, and a certain oscillating part always has an oscillating width as compared with other oscillating parts. It is possible to have a relationship that is large.

In particular, if the plurality of swinging portions are a backrest portion and a seat portion, a certain interlocking function can be provided to the backrest portion and the seat portion, although the configuration is very simple.
Preferably, the elastic support portion is a rod-like body that can be torsionally deformed and returned in the rotational direction about the axis as a center line, and the backrest portion is separated from the connection position of the seat portion with respect to the connection position of the leg portion. As long as it is connected at the position, the backrest portion always tilts more than the seat portion when a load is applied, and the feeling of use is improved.

  Alternatively, the plurality of swinging parts may be lumbar support parts located on the backrest part and the user's waist part. In that case, in particular, the elastic support portion is a rod-like body that can be twisted and restored in the rotational direction about the axis as a center line, and the backrest portion is more than the connection position of the lumbar support portion with respect to the connection position of the leg portion. For example, the lumbar support portion may protrude from the backrest portion as the backrest portion tilts more greatly as long as it is connected at a separated position.

Furthermore, if at least one of the plurality of oscillating portions is connected to the elastic support portion so that the position of the oscillating portion is adjustable, the oscillating portion is oscillated with respect to a specific oscillating portion or each oscillating portion according to the body shape of the user. The moving width can be adjustable.
(Definition of terms)
In the present specification, the following terms are used as concepts defined respectively.

  The “backrest portion” is a concept including not only the backrest body located on the back of the user but also a back support rod for supporting the backrest body.

  The “seat portion” is a concept that includes not only the seat body but also a seat receiving portion that supports the seat.

  “Tilt” is a concept indicating a state in which when a certain load is applied to the swinging part, the swinging part is moved relative to the support part from the initial state.

  “Oscillation width” is a concept used to relatively compare the degree of degree of tilting of the oscillating part when a constant load is applied to the oscillating part.

  As described above, the present invention includes a chair body provided with a swinging portion and a support body that supports the chair body on the leg portion, and the support body includes an elastic support portion that can be elastically deformed. The leg portion is connected to a part of the elastic support portion, while the swinging portion is a chair that is connected to the elastic support portion so that the position of the swinging portion can be adjusted. By changing the point where the swinging part is connected to the elastic support part, the distance between the connection point of the elastic support part with the leg part and the connection point of the swinging part may be changed. The swing width can be adjusted according to the body shape of the user while having a simple configuration.

  Further, the present invention comprises a chair body provided with a plurality of swinging parts, and a support body that supports the chair body on the leg part, and the support body comprises an elastic support part that can be elastically deformed. The leg portion is connected to a part of the elastic support portion, while the plurality of swinging portions are respectively connected to different portions of the elastic support portion, so that the plurality of swinging portions are in an unloaded state. It is possible to have a relationship in which the positional relationship is different from each other in a state where a load is applied, and a certain rocking portion always has a larger rocking width than other rocking portions.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

In the following description, with respect to a plurality of symmetrically existing portions, L and R symbols are added after the symbols attached to the drawings such as “arm portions 41L and 41R”, for example.
(First embodiment)
3 to 7 show an application of the technology according to the present invention to a chair in which the entire chair body swings and the swing width thereof can be adjusted.

The chair 1 includes a chair body 2 on which a user sits, a leg portion 3, and a support body 4 that supports the chair body 2 on the leg portion 3.
The chair body 2 has a seat portion 5 and a backrest portion 6, both of which are molded as a single body. A slide rail 51 extending in the left-right direction is provided on the lower surface of the seat portion 5. Further, rotation support shafts 52 for pivotally supporting the chair body 2 so as to be rotatable are provided at both left and right end portions of the seat portion 5.

The slide rail 51 is a long cylindrical body, and the shape of the hole 511 corresponds to the cross-sectional shape of the slide support 46 described later.
The leg 3 is of the type normally found in office swivel chairs, and is composed of upright columns 31 and leg blades 32 extending radially from the lower ends of the columns 31, and the upper ends of the columns 31 are The leg blade 32 is rotatable.

  The support body 4 is connected to the upper end of the column 31 of the leg 3 and has arm portions 41L and 41R extending upward in the left-right direction, and further connecting the upper ends of the arm portions 41L and 41R to each other. And the position adjustment rod 43 is provided in parallel.

  The torsion bar 42 is a rod-shaped rectangular parallelepiped formed by overlapping a plurality of leaf springs, and is firmly fixed so as not to rotate with respect to the arm portions 41L and 41R of the support 4. In the present invention, the torsion bar 42 functions as an elastic support portion.

  The position adjustment rod 43 is a rod-shaped body having a circular cross-sectional shape, and penetrates the arm portions 41L and 41R of the support body 4 in a rotatable manner. In addition, in the middle region of the position adjusting rod 43, male screws 431L and 431R having a predetermined width are cut in two symmetrical directions. The traveling directions of the male threads 431L and 431R are opposite to each other (that is, if 431L is a right-hand thread, 431R is a left-hand thread). Furthermore, a knob 432 is provided at one end of the position adjustment rod 43 for the user to perform a rotation operation.

Further, two slide supports 46L and 46R are provided, which respectively hold the torsion bar 42 and the position adjusting rod 43 and are slidable to the left and right.
A surface 461 (see FIG. 4) corresponding to the torsion bar 42 of the slide supports 46L and 46R corresponds to a cross-sectional shape (in this case, a substantially rectangular shape) of the torsion bar 42. Further, female screws 462L and 462R are cut at portions of the slide supports 46L and 46R that hold the position adjusting rod 43, and are engaged with male screws 431L and 431R provided on the position adjusting rod 43.

  By providing the slide support in this manner, when the user rotates the knob 432 to rotate the position adjustment rod 43, the slide supports 46 </ b> L and 46 </ b> R screwed with the position adjustment rod 43 are connected to the torsion bar 42. It moves symmetrically in the length direction, that is, in the left-right direction. For example, when the knob 432 is rotated clockwise in FIG. 5 (F1), the left and right slide supports 46L and 46R are separated from each other (E1L and E1R), and conversely when the knob 432 is rotated counterclockwise ( F2) The left and right slide supports 46L, 46R are close to each other (E2L, E2R).

  On the other hand, the chair body 2 is provided with rotation support shafts provided at both left and right ends of the seat portion 5 with respect to the bearing portions 48 provided at positions substantially coaxial with the torsion bars 42 at the upper ends of the arm portions 41L and 41R of the support body 4. The slide rail 51 provided on the lower surface of the seat portion 5 is supported by holding slide supports 46L and 46R provided on the upper portion of the support body 4 so as to be movable left and right. .

  In the chair having such a configuration, when the user sits and puts weight on the backrest portion 6 of the chair body 2, a torsional load is applied to the torsion bar 42 via the slide rail 51 and the slide supports 46L and 46R on the lower surface of the seat portion 5. Is added. The torsion angle at this time varies depending on distances lL and lR (see FIG. 7) from both ends of the torsion bar 42 fixed to the arm portions 41L and 41R of the support 4 to the slide supports 46L and 46R. That is, the torsion angle of the torsion bar 42 increases as the distances lL and lR increase. That is, the swinging width of the chair body 2 can be reduced as the slide supports 46L and 46R are brought closer to both ends of the torsion bar 42 by rotating the knob 432 (FIG. 6A). The state of FIG. 7 (a)) and the greater the distance between the two, the larger the swinging width (the states of FIG. 6 (b) and FIG. 7 (b)).

The torsion bar 42 has a substantially rectangular cross-sectional shape, and the surface corresponding to the torsion bar 42 of the slide supports 43L and 43R is formed as a rectangular hole corresponding to the cross-sectional shape of the torsion bar 42. Even when a load is applied and tilted, the slide supports 43L and 43R can be firmly held against the torsional stress of the torsion bar.
(Second embodiment)
8 to 10 show the application of the technique according to the present invention to a chair in which the backrest 6 and the seat 5 swing together. The present embodiment is characterized in that the seat portion 5 and the backrest portion 6 are fixedly connected to the torsion bar 42, respectively.

The chair 1 includes a chair body 2 on which a user sits, a leg portion 3, and a support body 4 that supports the chair body 2 on the leg portion 3.
The chair body 2 has a seat portion 5 and a backrest portion 6, both of which are separate bodies.
The seat portion 5 includes a seat 53 and a seat receiver 54, and rotation support portions 541 for rotatably supporting the entire seat portion 5 with respect to the support body 4 are provided at both left and right end portions of the seat receiver 54. Yes. In addition, two ribs 542 and 542 are provided at positions slightly closer to the center than the left and right ends, and the ribs 542 and 542 are each provided with a hole 543 penetrating in the left-right direction.

The backrest portion 6 has a backrest main body 61 and a back support rod 62 that supports the backrest body 61, and the back support rod 62 extends to the lower surface of the seat portion 5. A hole 621 penetrating in the left-right direction is provided on the side located on the lower surface of the seat portion.
The holes 543 and 621 have shapes corresponding to the cross-sectional shape of the torsion bar 42 described later.

The legs 3 are the same as those in the first embodiment.
The support body 4 is connected to the upper end of the column 31 of the leg 3 and has arm portions 41L and 41R extending upward in the left-right direction, and further connecting the upper ends of the arm portions 41L and 41R to each other. Is provided.

  The torsion bar 42 is a rod-shaped rectangular parallelepiped formed by overlapping a plurality of leaf springs, and is firmly fixed so as not to rotate with respect to the arm portions 41L and 41R of the support 4. In the present invention, the torsion bar 42 functions as an elastic support portion.

  On the other hand, the chair body 2 is provided with rotational support shafts provided at both left and right ends of the seat support 54 with respect to the bearing portions 48 provided at positions substantially coaxial with the torsion bars 42 at the upper ends of the arm portions 41L and 41R of the support body 4. 52, and the torsion bar 42 passes through the holes 543 provided in the ribs 542 and 542 of the seat receiver 54, respectively, and the points 421L and 421R are provided symmetrically slightly inward from both ends of the torsion bar 42. (See FIG. 9).

  On the other hand, with respect to the back support rod 62, the torsion bar 42 passes through the hole 621, and is fixed at points 422L and 422R provided symmetrically on the inner side of the points 421L and 421R.

In the chair having such a configuration, when a user sits and puts weight on the back of the backrest 6 and the seat 5 of the chair body 2, the torsion bar 42 is twisted at points 421L, 421R, 422L, and 422R, respectively. A load is applied.
At this time, the torsion angle at the points 422L and 422R is always larger than that at the points 421L and 421R regardless of the distribution of the load applied to each. This is because the distance from both ends of the torsion bar 42 fixed to the arm portions 41L and 41R of the support 4 is long. Therefore, in such a chair, the back seat interlocking system that allows the swinging width of the backrest portion to be larger than the swinging width of the seat portion can be realized with the simple configuration as described above. . (Interlocking of the swinging width R1 of the seat portion and the swinging width R2 of the backrest portion in FIG. 10)
In addition, this invention is not limited to the aspect described in said each embodiment, A various deformation | transformation is possible.

  In the first embodiment, the swinging portion is a combination of the backrest portion and the seat portion, but the swinging width of the swinging portion can be adjusted in the first embodiment. Since it is the main focus, it is possible to replace each part of the chair with the swinging part. As a typical and preferred example, for example, the swinging part may be only the back part of the chair, but it may also be applied to an armrest, a headrest, a lumbar support that supports the user's waist, or a combination thereof. If so, the swinging width of each part can be adjusted with a simple mechanism.

  In the second embodiment, the backrest and the seat portion are shown to be interlocked, but various combinations of the interlocking portions are conceivable.

  For example, if the backrest and the headrest provided at the top of the backrest are interlocked and adjusted so that the headrest protrudes slightly forward when the backrest is tilted deeply, the user's head can be held stably. Can do.

  Also, if the backrest part and the lumbar support part are interlocked so that the lumbar support part protrudes slightly forward when the backrest part is tilted, the lumbar support part is only on the user's waist when the backrest part is tilted. You can do something like that.

  If the footrest is provided in front of the chair and the backrest and the footrest are interlocked so that the footrest rises when the backrest is tilted, the user can take a more relaxed posture.

  Further, it can be considered that the above interlocking mechanism is realized at a time. In that case, three or more swinging portions are connected to the elastic support portion. If it is desired to individually adjust the swing width of each swing portion, a position adjustment rod may be provided for each swing portion.

  When the backrest and the seat are interlocked, the backrest and the seat need not necessarily be separated and independent. For example, even if the chair has a shell structure integrated with the back seat, if the connecting part between the backrest body and the back support bar can be changed in angle or position, the difference in swinging width of each back seat can be adjusted by the connecting part. it can.

In addition, since the present invention uses a simple mechanism, it is relatively easy to add an additional function. For example,
In relation to the bearing of the arm portion and the rotation support shaft of the seat portion, it is possible to limit the range in which the chair body swings by providing a claw on one side and a contact of the claw on the other side. In that case, if there is a claw and a claw contact so that the torsion bar can be elastically deformed only in one direction in the no-load state, the chair body will always swing only backward, Excessive tilting of the chair body can be prohibited if the pawl and the pawls are prevented from swinging beyond a certain angle. Further, it is possible to add a lock mechanism that maintains the state in which the swinging portion is tilted by the swinging mechanism.

  The first embodiment and the second embodiment can be combined. That is, if a plurality of swinging portions are connected to an elastic support portion, and if one or more of the swinging portions are attached to the elastic support portion so that the position thereof can be changed, The distribution of the swinging width of each swinging part can be freely adjusted.

  In the embodiment, the torsion bar is formed as a rod-shaped rectangular parallelepiped by overlapping a plurality of leaf springs, but is not limited to this and may be composed of a single rod material.

In the above embodiments, both ends of the torsion bar are fixed portions, but the vicinity of the center of the torsion bar can be fixed. In that case, both ends of the torsion bar are free ends, so if you have a plurality of swinging parts, the one connected to the vicinity of both ends of the torsion bar is more unique while matching the swinging of other swinging parts It can be swung. For example, when one of a plurality of swinging parts is a chair body with a backrest and a seat integrated, and the other is an armrest, and the armrest is connected to the vicinity of both ends of the torsion bar, the user can integrate the chair body and the armrest together. As a result, it is possible to freely swing only the armrest while swinging freely.
Furthermore, the elastic support part does not necessarily need to be a torsion bar. For example, even when a part of the spiral spring or the coil spring is fixed and the swinging part is connected to the other part, the same effect can be obtained depending on the elastic force of the spring and the setting of the connecting place.

  The leg portion can be applied not only to the rotary chair type but also to any form.

  In addition, various applications are possible without departing from the spirit of the present invention.

FIG. 5 is a basic conceptual diagram showing a torsion angle when a torsion moment is applied to a torsion bar. FIG. 5 is a basic conceptual diagram showing a torsion angle when a torsion moment is applied to a torsion bar. FIG. 5 is a basic conceptual diagram showing a torsion angle when a torsion moment is applied to a torsion bar. FIG. 5 is a basic conceptual diagram showing a torsion angle when a torsion moment is applied to a torsion bar. It is a basic conceptual diagram showing a torsion angle when both ends of a torsion bar are fixed and a torsion moment is applied to the center part. It is a disassembled perspective view showing the whole structure of 1st embodiment. It is a disassembled perspective view explaining the structure of the principal part in 1st embodiment. It is a fragmentary detailed view explaining the operation situation of the principal part in a first embodiment. It is a schematic side view explaining the use condition in 1st embodiment. It is a fragmentary detailed view explaining the use condition in a first embodiment. It is a disassembled perspective view showing the whole structure of 2nd embodiment. It is a partial detail drawing explaining the structure of the principal part in 2nd embodiment. It is a schematic side view explaining the use condition in 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Chair 2 ... Chair main body 3 ... Leg part 4 ... Support body 5 ... Swing part (seat part)
6 ... Oscillating part (backrest part)
42 ... Elastic support (torsion bar)

Claims (11)

A chair body provided with a swinging part, and a support body that supports the chair body on the leg part,
The support includes an elastic support that can be elastically deformed,
While the leg is connected to a part of the elastic support,
The swinging portion is a chair that is connected to the elastic support portion so as to be close to or separated from a position where the leg portion is connected to the elastic support portion. The elastic support part is a rod-shaped body that can be twisted and restored in the rotational direction with the axis as a substantially center line,
The leg portion and the swinging portion are respectively connected to different portions in the length direction of the rod-shaped body.
The chair according to claim 1. The chair according to claim 2, wherein the rod-like body has a polygonal cross-sectional shape. The chair according to claim 1, 2, 3 wherein the swinging part is a backrest part. The chair according to claim 1, wherein the swinging portion is a seat portion. A chair body provided with a plurality of swing parts, and a support body that supports the chair body on the leg part,
The support includes an elastic support that can be elastically deformed,
While the leg is connected to a part of the elastic support,
The plurality of swinging portions are chairs formed by connecting the elastic support portions to different positions from the positions where the leg portions are connected to the elastic support portions. The chair according to claim 6, wherein the plurality of swinging parts are a backrest part and a seat part. The elastic support part is a rod-shaped body that can be twisted and restored in the rotational direction with the axis as a substantially center line,
The backrest part is connected to the connecting position of the leg part at a position separated from the connecting position of the seat part,
The chair according to claim 7. The backrest portion includes a backrest main body positioned on the user's back and a lumbar support portion positioned on the user's waist, and the plurality of swinging portions are the backrest main body and the lumbar support portion. The listed chair. The elastic support part is a rod-shaped body that can be twisted and restored in the rotational direction with the axis as a substantially center line,
The backrest part is connected to the connecting position of the leg part at a position separated from the connecting position of the lumbar support part.
The chair according to claim 7. At least one of the plurality of swinging parts is connected to the elastic support part so that the position thereof can be adjusted.
The chair according to claim 6, 7, 8, 9, 10.

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