JP2008253654A - Cloth spring type chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cloth spring type chair, preventing a user from feeling resistance even in rising. <P>SOLUTION: In this cloth spring type chair, a fabric is continuously stretched from a backrest to a seating surface to form a body support surface 13, the upper half part of the backrest and both right and left edges of the front half part of the seating surface are locked on the right and left opposite frame rods, the lower half part of the backrest and both right and left edges of the rear half of the seating surface are made as free edges 31 which are not locked on the frame rods, a frame rod 36 for locking the backrest is rockably joined to a body frame 22 by pins, and the angle of inclination of a fixed backrest 28 to a fixed seating surface 30 is controlled to increase or decrease. In the thus constructed chair, (1) a lumber support 33 is stretched in the back of the free backrest 32 of the lower half part, the edge of which is a free edge, between rocking frame rods 36, and (2) a back-up sheet 35 is stretched in the rear of the free seating surface 39 of the rear half part, the edge of which is a free edge, between the frame rods 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chair such as a seat, a chair, and a wheelchair.

  A body support surface that supports the body by stretching an elastic fabric with a tensile stress of 120 to 600 (N / 5cm) when stretched continuously from the backrest to the seating surface between the frame heel and the frame heel facing the chair. The left and right ends of the elastic fabric at the upper half of the backrest and the front half of the seating surface are a frame ridge facing the left and right and a fixed edge locked to the frame ridge, and the lower half of the backrest A cloth spring-type chair is known in which the left and right edges of the elastic fabric are free edges that are not locked to the frame collar in the latter half of the seat surface (see, for example, Patent Document 1).

  In this cloth spring type chair, the space between the back of the elastic fabric and the seat is free, and when the weight acts and the latter half of the seat sinks, the back rest is preferred to lift, so the second half of the seat The body does not sink significantly, and the seating surface and backrest follow each other as it moves, allowing it to expand and contract, free movement is not constrained, giving it a sense of release, and the second half of the elastic fabric seat surface The part sinks moderately and a step occurs between the first half part and the hook part is caught in the step. For this reason, there is no unnatural posture such as slipping forward in the buttocks, sitting in the sacrum, or sitting in the zuccoche, reducing the load on the body during use, and feeling no pain There is an advantage that the body is stably supported for a long time.

JP 2006-296706 A

  The cloth spring-type chair is made swingable by pin-joining a frame collar for locking the upper half of the backrest of the elastic fabric to the chair body frame 22, and the inclination angle of the upper half of the backrest with respect to the seating surface. When the reclining chair is adjustable and adjustable, and when trying to get up lying down on its body support surface, the continuous part between the backrest and seating surface of the free elastic fabric sinks greatly, and it is difficult to get up This is a problem.

  Therefore, an object of the present invention is to obtain a cloth spring type chair that does not feel resistance even when trying to get up from a lying posture.

In the cloth spring type chair according to the present invention, (a) a body support surface 13 that supports the body is constructed by stretching a continuous fabric 12 from a backrest to a seat surface between a frame heel and a frame heel facing each other. (B) In the upper half of the backrest and the front half of the seating surface, the left and right edges of the fabric 12 are the frame ridges facing the left and right and the fixed edges 14 and 14 locked to the frame ridges. C)
In the lower half of the backrest and the rear half of the seat surface, the left and right edges of the fabric 12 are free edges 31 and 31 that are not locked to the frame collar, and (d) the end edges are the free edges 31. On the back side of the free backrest 32 in the lower half, a lumbar support 33 is stretched between swinging frame rods 36, 36 facing left and right, and (e) the latter half in which the end edge is a free edge 31 The first feature is that the pack-up seat 35 is stretched between the frame flanges 11a and 11b facing the left and right sides of the free seating surface 39.

  The second feature of the cloth spring type chair according to the present invention is that, in addition to the first feature described above, (f) a frame rod 36 that locks the edge of the fabric 12 in the upper half of the backrest includes a chair body. (G) The inclination angle α of the fixed back 29 of the upper half with respect to the fixed seat 30 of the front half where the end edge of the fabric 12 is locked to the frame ridge 11. Is that it can be adjusted.

  The third feature of the cloth spring type chair according to the present invention is that, in addition to any of the first and second features, (F) the fixed edge 14 of the fabric 12 that is locked to the frame rod 11 (36). Is formed into a bag-shaped cavity 15, (i) an edge trim 16 is inserted into the bag-shaped cavity 15, and (nu) a screw thread is inserted into the frame collar 11 (36) that locks the fixed edge 14 of the fabric 12. The insertion hole 20 is formed, and (l) the rim 16 is overlapped with the frame ridge 11 (36), and the fabric 12 is overlapped with the frame ridge 11 (36) via the rim 16 The edge rod 16 is joined to the frame rod 11 by the screw member 17 penetrating the frame rod 11 (36), and (W) the end portion 18 of the screw member is the back side of the body support surface 13 of the frame rod 11 It is in the point protruding on the back.

The fourth feature of the cloth spring type chair according to the present invention is that, in addition to any of the first, second and third features, (f) the air permeability of the fabric 12 is 150 cc / cm ² · sec or more. There is a point.

  The fifth feature of the cloth spring chair according to the present invention is that, in addition to any of the first, second, third and fourth features, (i) the left and right frame rods 11a and 11b face each other. It exists in the point whose tensile stress at the time of 10% expansion | extension of the fabric 12 in the width direction of a chair is 120-600 (N / 5cm).

  The sixth feature of the cloth spring type chair according to the present invention is that, in addition to any of the first, second, third, fourth and fifth features, (t) the main body frame 22a and the main body frame facing left and right Each of the rocking rods 23a and 23b is pin-joined to each of 22b, and (b) the left and right rocking rods 23a and 23b are pin-joined. 24, the tip of the swing rod opposite to the pin joint point 25 between the swing rod 23 and the main body frame 22 is a free end 26, and (i) a fixed seat surface on the free end 26 The frame collars 11 that lock the fixed edges 14 of the 30 fabrics are joined together. (E) The left and right body frames 22a and 22b are swung in the direction in which the left and right rocking rods 23a and 23b face each other. The width of the body support surface 13 between the two is in a point where expansion / contraction can be adjusted.

In the present invention (Claim 1), even when the intermediate portion 38 between the fixed seat surface 30 and the fixed backrest 29 of the fabric 12 constituting the body support surface 13 is in a free state where the edges are not locked, Since the reaction force from the lumbar support 33 on the back side of the free backrest 32 and the pack-up seat 35 on the back side of the free seating surface 39 acts, the free intermediate portion 38 does not sink.
When the free seating surface 39 sinks while sitting down on the body support surface 13, the pack-up seat 35 pushes up the free seating surface 39, and the fixed backrest 29 becomes the preferred way to lift the free seating surface 39. There is no particular sinking.
When the free backrest 32 is depressed due to drowning, the lumbar support 33 is pushed back, so that it is not greatly depressed.
And in the free seat surface 39 and the free backrest 32, since the edge of the fabric becomes the free edge 31 which is not latched by the frame collar, it stretches and vibrates following the body which moves like a swing. Gives a sense of liberation without being constrained by free movements.
Furthermore, since a slight step (step) is generated between the free seating surface 39 and the fixed seating surface 30 that sinks while sitting down, and the buttocks are caught, the sacrum sitting forward, An unnatural posture such as sitting in the zukoke is not forced, and the body is stably supported for a long time.
In addition, even if there are gaps or steps between the fixed seat surface 30 and the pack-up seat 35, the pack-up seat 35 and the lumbar support 33, and the lumbar support 33 and the fixed backrest 29, the fabric 12 that is continuous above them. Because it is covered with, it does not feel those gaps or steps.

In particular, in the upper half of the backrest, a frame collar 36 that locks the edge of the fabric 12 is pin-coupled to the chair body frame 22 so as to be swingable, and the edge of the fabric 12 is locked to the frame collar 11. When the inclination angle α of the fixed back 29 of the upper half with respect to the fixed seat 30 is adjustable, the edge is not locked when trying to get up from a lying posture. Although the weight concentrates on the free backrest 32 and the free seating surface 39, the weight tends to sink greatly. In the present invention, the lumbar support 33 on the back side of the free backrest 32 and the back-up seat 35 on the backside of the free seating surface 39 are counteracted. Because the force acts, it does not sink greatly and it is easy to get up.
Therefore, according to the present invention (Claim 2), a cloth spring type reclining chair can be obtained in which the body is stably supported over a long period of time and is comfortable to sit on, and is easy to get up from a lying position.

In the present invention (Claim 3), the edge guard 16 overlaps the frame collar 11 (36), and the fabric 12 overlaps the frame collar 11 (36) via the edge collar 16 to support the body. Since the module is configured and joined to the frame rod 11 (36) together with the edge rod 16 by the screw member 17, the screw member 17 is removed and replaced or washed as needed to keep the body support surface 13 clean at all times. I can do it.
Since the end portion 18 of the screw member 17 for fixing the body supporting surface module to the frame flange 11 (36) protrudes from the back surface of the frame flange 11 (36) which is the back side of the body supporting surface 13, the protruding end thereof. The beauty and feel of the body support surface 13 are not impaired by the portion 18.

In the present invention (Claim 4), since the air permeability is constituted by the porous fabric 12 having a flow rate of 150 cc / cm ² · sec or more, the body support surface 13 does not feel stuffiness, and the fabric 12 is in such a manner. Even if it is porous, the free backrest 32 and the free seating surface 39 will not sink and it will not be difficult to get up.

  In the present invention (Claim 5), since the tensile stress at the time of 10% elongation of the fabric 12 constituting the body support surface 13 is 120 to 600 (N / 5 cm), the free backrest 32 and the free seating surface 39 sink. The frame rods 11a and 11b have a moderate cushioning property and are tensioned with the fabric 12 at the free ends 26 and 26 of the swing rods 23a and 23b that are pin-joined and face to the left and right. When the two are joined, the stretchability of the fabric 12 is promoted by the bending and swinging of the swinging rods 23a and 23b, so that a cloth spring type chair excellent in cushioning properties can be obtained.

In the present invention (Claim 6), the frame rods 11a and 11b facing each other with the fabric 12 stretched are joined to the free ends 26 and 26 of the rocking rods 23a and 23b facing each other by being pin-joined. According to the weight applied to the support surface 13, it can be swung by a tension acting on the fabric 12.
For this reason, when a strong tension is applied to the fabric 12, the screw member 17 also swings around the pin joint 24 between the swinging rods integrally with the rim 16, the frame rod 11 and the swinging rod 23. The bending stress applied to the screw member 17 due to the tension is absorbed and relaxed by the work such as the swinging rocking rod.
Therefore, it is not necessary to use thick and heavy members for the frame rod 11 and the edge rod 16 as well as the screw member 17, and the chair frame can be reduced in weight.

For the elastic fabric 12, an elastic yarn having a breaking elongation of 60% or more and an elastic recovery rate of 90% or more after 15% elongation, for example, a polyether ester fiber yarn may be used.
The elastic fabric 12 may be a woven or knitted fabric in which the length direction of the elastic yarn is directed in the width direction of the chair. It may have a heavy structure.
The elastic fabric 12 may be woven or knitted with a normal spun yarn or multifilament yarn, which is a non-elastic yarn, with its length direction directed toward the depth direction of the chair.
In particular, in the knitted fabric, a weft insertion knitted fabric in which elastic yarns are knitted in a straight line may be used.
The elastic fabric 12 may be tailored so as to be continuous from the backrest 29 to the seating surface 30 by stitching a plurality of fabrics.

1 and 2 show an embodiment of the present invention applied to a wheelchair.
The body support surface 13 is constituted by an elastic fabric 12 that is continuous from the fixed backrest 29 to the fixed seating surface 30.
A swing frame rod 36 is directly inserted into the bag-like cavity 15 of the fixed edge 14 in the fixed back 29 of the elastic fabric 12.
An edge trim 16 is inserted into the bag-like cavity 15 of the fixed edge 14 on the fixed seat surface 30 of the elastic fabric 12. The edge trim 16 is placed on the frame collar 11, and the edge trim 16 from the back side of the fixed seat 30. And the frame rod 11 is screwed.
The left and right facing frame rods 11a and 11b are rigidly connected to the free ends 26 and 26 of the swinging rods 23a and 23b that are pin-joined to the left and right facing body frames 22a and 22b.
The left and right rocking rods 23a and 23b are pin-joined at the intermediate portions of the pin joint points 25a and 25b between the free ends 26 and 26 and the main body frames 22a and 22b. The swing rods 23a and 23b are swung to expand and contract the width between the left and right body frames 22a and 22b, so that the wheelchair can be folded (see FIG. 3).
The upper and lower ends of the swing rod 23 with the pin junction 24 as a boundary are branched, and the branch rods 23e and 23f at the upper end thereof are rigidly connected to the front and rear ends of the frame rod 11, and The branch rod is pin-joined to the front end and the rear end of the main body frame 22 (see FIG. 1).

  The swing frame rod 36 is pin-coupled to the main body frame 22 so as to be swingable, and can adjust the inclination angle α of the fixed backrest 29 with respect to the fixed seat surface 30. In FIG. 2, reference numeral 37 indicates a damper (hydraulic cylinder) that relaxes the swing of the swing frame rod 36.

Between the fixed back 29 of the edge of the elastic fabric 12 and the fixed seat 30 is a free edge 31 that is not gripped by either the frame rod 11 or the swing frame rod 36. On the back side of the free backrest 32 sandwiched between the left and right free edges 31a and 31b, a lumbar support 33 is spanned between the left and right swing frame rods 36 and 36. On the back side of the free seating surface 39 sandwiched between the left and right free edges 31a and 31b, a reinforcing elastic fabric 34 is stretched between the left and right swing frame rods 36 and 36 to form a pack-up seat 35. Yes.
Both left and right edges of the reinforcing elastic fabric 34 are bag-like cavities, similar to the fixed seat surface 30 gripped by the frame collar 11 of the elastic fabric 12 from the fixed back 29 to the fixed seat 30. An edge trim is inserted into the bag-like cavity and is screwed to the frame collars 11a and 11b together with the edge trim.

On the fixed seat surface 30, the elastic fabric 12 is folded back to be double.
The pack-up seat 35 is set at a position deeper than the double fixed seat surface 30 as a cushioning material that regulates the body support surface 13 with the waist down to a required sink.
The extension force Fb at the time of 10% extension in the width direction of the pack-up seat 35 is weaker than the extension force Ff at the time of 10% extension in the width direction of the fixed seat surface 30 (Ff> Fb). The stretching force Ff of the elastic fabric 12 on the seat surface 30 is 0.3 to 0.9 times (Fb = 0.3 Ff to 0.9 Ff).

A spacer 19 is sandwiched between the overlapping rim 16 and the frame 11 (FIGS. 4 and 5).
By replacing the spacer 19, the distance between the frame rod 11 and the fabric 12, that is, the height of the body support surface 13 can be adjusted.
In addition, regardless of the cross-sectional shape of the overlapping frame rod 11 and edge trimming 16, the contact surface of the spacer 19 with the frame collar 11 or edge trimming 16 is the same as the peripheral surface shape of the frame collar 11 or edge trimming 16. By simply processing into the same shape, the frame rod 11 and the edge trimming rod 16 can be substantially brought into surface contact via the spacer 19.
If it demonstrates with a specific example, as shown in FIG.5 (b), (c), and (d), when the pipe of circular cross section is used for the frame rod 11 and the edge rod 16, those overlapping states are a line point (corollary). ) Although it is in a contact state, if both ends of the spacer 19 are cut into an arc shape in accordance with the circumferential surface of the pipe having the circular cross section, the circumferential surfaces of the frame rod 11 and the edge trimming rod 16 are in surface contact with the spacer 19. The frame rod 11 and the edge trimming rod 16 are brought into a substantially stable surface contact state via the spacer 19.
Accordingly, since the screw member 17 is a thin screw and does not require the use of a thick bolt, the chair frame can be reduced in weight, and the thick screw insertion hole 20 and the screw hole 28 can be formed in accordance with the bolt. It does not have to be provided on the rim 16.

The spacer 19 can be in rigid contact with either the frame rod 11 or the edge rod 16 (FIG. 5-b).
However, in order to adjust the height of the body support surface 13, it is desirable to remove the screw member 17 between the frame rod 11 and the edge trimming rod 16 and sandwich the spacer 19 so that it can be inserted and removed (FIGS. 5-c and 5). -D).
In particular, in order to reduce the weight of the chair frame, it is recommended to use a pipe for the spacer 19 (FIG. 5-d).
The spacer 19 can be sandwiched between the frame rod 11 and the edge rod 16 at a predetermined interval (FIG. 4).

The frame rod 11 is provided with a screw insertion hole 20, and the screw material 17 that passes through the insertion hole 20 and is inserted from the frame rod 11 into the edge trim 16 is screwed to the edge trim.
As described above, when the screw insertion hole 20 is drilled in the frame rod 11 and the screw material 17 is inserted into the insertion hole 20 and the edge trimming rod 16 is screwed and fixed to the frame rod 11, the fabric tensioning operation is efficiently performed. Can be done.

The spacer 19 is not necessarily provided with an insertion hole into which the screw material 17 is inserted.
That is, as shown in FIG. 5A, a gap is provided by loosening the screw member 17 between the frame rod 11 joined by the screw member 17 without using the spacer 19 and the edge rod 16, and the spacer 19 is provided in the gap. After that, the screw member 17 can be strongly tightened to bring the spacer 19 into close contact with the frame rod 11 and the edge trimming rod 16.

At the fixed edge 14 of the fabric, the edge trimming bar 16 is positioned outside the frame collar 11 and the edge trimming bar 16 in a direction inclined at an angle θ of 40 degrees to 80 degrees with respect to the body support surface 13 constituted by the fabric 12. And the shaft core wire 21 of the screw material may be inclined with respect to the body support surface 13 at the same angle as the inclination angle θ.
Then, the tension generated in the fabric 12 according to the weight applied to the body support surface 13 acts as a pressing force for crimping the edge trimming bar 16 to the frame bar 11, resulting in a strong bending stress on the screw member 17. It does not act, and it is not necessary to use a thick screw for the screw material 17.

The axial center line 21 of the screw member may be positioned within the same geometrical plane as the straight line 27 connecting the pin joint point 24 between the left and right swinging flanges 23a and 23b and the axial center line of the frame rod 11.
Then, the protruding portion of the screw member 17 from the frame rod 11 and the pin joint point 24 between the left and right rocking rods and the rocking force against the tension acting on the fabric 12 according to the weight applied to the body support surface 13 The direction of action of the reaction force generated at the pin joint 25 of the flange 23 and the frame 22 coincides in the geometric plane, and a strong bending moment acts on the screw member 17 due to the mismatch of the action directions of these reaction forces. Can be avoided.
In particular, when a spacer 19 having a contact surface with the frame rod 11 or the edge trim 16 having the same shape as the peripheral surface thereof is used, the bending moment due to the tension of the fabric 12 may act on the spacer 19. It does not act on the screw material 17.
In this respect also, it is not necessary to use a thick screw for the screw material 17.

For this purpose, the spacer 19 is either rigidly connected to the frame rod 11 or the edge rod 16, preferably bonded to the edge rod 16, adhered by an adhesive, or fused or welded by heat melting, and is integrated with the edge rod 16. It is desirable to do.
If the spacer 19 is integrated with either the frame rod 11 or the edge rod 16 as described above, there is no displacement of the screw material 17 or the spacer 19 when the edge rod 16 and the frame rod 11 are bonded. It can be done efficiently.

In order to prevent the bending moment due to the tension acting on the fabric 12 from acting on the screw member 17, the dimension (thickness e) of the spacer 19 from the frame rod 11 to the edge trim 16 is about the same as the thickness of the fabric 12. The contact surface of the spacer 19 with the frame rod 11 can maintain a concave curved surface having the same shape as the peripheral surface of the frame rod 11, and the spacer 19 contacts the edge trim 16. The surface can maintain a concave curved surface having the same shape as the peripheral surface of the rim 16 and is as short as possible as long as it is narrowed between the frame 11 and the rim 16 and the spacer 19 is not sheared or broken. (make it thin.
Specifically, the dimension (thickness e) of the spacer 19 from the frame rod 11 to the edge trim 16 may be 2 mm or less (around 1 mm).

  In order to reduce the weight of the chair frame, it is recommended to use pipes for the frame rod 11 and the edge rod 16 (FIG. 5). In that case, the screw hole 28 is provided in a member fitted in the cavity of the pipe. Although FIG. 5 shows an embodiment in which a tapping bolt is used as the screw material 17, the bolt can be used as the screw material 17 and can be projected from the rim 16. In that case, a nut is screwed onto the tip of the bolt protruding from the screw insertion hole 20 of the frame rod 11.

It is a perspective view of the cloth spring type reclining wheelchair concerning the present invention. It is a side view of the cloth spring type reclining wheelchair concerning the present invention. It is a front view of the body support surface of the cloth spring type chair concerning the present invention. It is a principal part front view of the body support surface of the cloth spring type chair which concerns on this invention. It is a principal part enlarged front view of the body support surface of the cloth spring type chair which concerns on this invention.

Explanation of symbols

11: Frame rod 12: Fabric 13: Body support surface 14: Fixed edge 15: Cavity 16: Edge trim 17: Screw material (screw)
18: Screw material end 19: Spacer 20: Screw insertion hole 21: Screw material shaft core line 22: Main body frame 23: Swing rod 24: Pin joint 25 between the rocking rods 25: Swing rod and frame Pin joint 26: Free end 27: Straight line 28: Screw hole 29: Fixed back 30: Fixed seat 31: Free edge 32: Free back 33: Lumber support 34: Reinforcement elastic fabric 35: Pack-up sheet 36: Swing frame 桿 37: Damper 38: Intermediate part 39: Free seat

Claims (6)

(I) A body support surface (13) for supporting the body is constructed by stretching a continuous fabric (12) from the backrest to the seating surface between the frame heel and the frame heel facing the left and right of the chair,
(B) In the upper half of the backrest and the front half of the seating surface, the left and right edges of the fabric (12) are the frame edges facing left and right and the fixed edges (14, 14) locked to the frame collar,
(C) In the lower half of the backrest and the latter half of the seating surface, the left and right edges of the fabric (12) are free edges (31, 31) that are not locked to the frame collar,
(D) On the back side of the free backrest (32) in the lower half where the end edge is a free edge (31), a lumbar support (33) is placed between the swinging frame rods (36, 36) facing left and right. It is being passed over
(E) The pack-up seat (35) is stretched between the frame ridges (11a, 11b) facing the left and right on the back side of the free seating surface (39) in the latter half part, the end edge of which is a free edge (31). Cloth spring type chair. (F) A frame collar (36) for locking the edge of the fabric (12) in the upper half of the backrest is pin-joined to the chair body frame (22) so as to be swingable.
(G) The inclination angle (α) of the fixed backrest (29) of the upper half portion with respect to the fixed seat surface (30) of the front half portion where the edge of the fabric (12) is locked to the frame rod (11) is adjusted. The cloth spring type chair according to claim 1, which is enabled. (H) The fixed edge (14) of the fabric (12) locked to the frame rod (11, 36) is a bag-like cavity (15),
(L) An edge trim (16) is inserted into the bag-shaped cavity (15),
(Nu) A screw insertion hole (20) is drilled in the frame rod (11, 36) for locking the fixed edge (14) of the fabric (12).
(Le) The rim (16) overlaps the frame ridge (11, 36), and the fabric (12) overlaps the frame ridge (11, 36) via the rim (16).
(E) The edge rod (16) is joined to the frame rod (11) by the screw material (17) penetrating the frame rod (11, 36).
The cloth spring type chair according to any one of claims 1 and 2, wherein an end portion (18) of the screw member protrudes from the back surface of the frame rod (11) which is the back side of the body support surface (13). . (F) The cloth spring type chair according to any one of claims 1, 2 and 3, wherein the air permeability of the fabric (12) is 150 cc / cm ² · sec or more. (Iv) The above-mentioned item wherein the tensile stress at 10% elongation of the fabric (12) in the width direction of the chair where the left and right frame rods (11a) and (11b) face each other is 120 to 600 (N / 5 cm). Cloth spring type chair according to any one of 2, 2, 3 and 4. (T) Oscillating rods (23a, 23b) are pin-bonded to the body frame (22a) and the body frame (22b) facing left and right,
(L) These left and right swing rods (23a, 23b) are pin-joined,
(G) The swing rod that is on the opposite side of the pin joint point (25) between the swing rod (23) and the body frame (22) with the pin joint point (24) between the left and right swing rods as a boundary. The tip is a free end (26),
(Tsu) A frame rod (11) for engaging the fixed edge (14) of the fabric of the fixed seat surface (30) is joined to the free end (26),
(E) The width of the body support surface (13) between the left and right body frames (22a, 22b) is adjusted to expand and contract by swinging in the direction in which the left and right swing rods (23a) and the swing rod (23b) face each other. A cloth spring type chair according to any of the preceding claims 1, 2, 3, 4 and 5.

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