Chairs and their backs

Abstract

To increase a commodity value by securing necessary strength without reducing opening areas of punched holes in a back plate having many punched holes and enhancing a see-through feature by exposing both front and rear surfaces of the back plate.SOLUTION: In a back plate 2, groups of vertically long punched holes 21 are formed in multiple stages. Inclined surfaces 23, 24 are provided at side rims of each of the punched holes 21 by cutting edge parts. The inclined surfaces 23, 24 are symmetrical on both sides of a longitudinal center line 25. Since the visibility of the punched hole 21 is increased by the inclined surfaces 23, 24, a high see-through feeling, as if the back plate 2 is opened with a wide area, can be given to a person. Since the cross-sectional area of a strip portion 26 is not reduced much even after the inclined surfaces 23, 24 are provided, the strength required for the back plate 2 can be secured.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a chair and a backrest. [Background technology]

[0002] Chairs come in a variety of forms, and swivel chairs, which are commonly used in offices, consist primarily of a caster-equipped leg system, a seat, and a backrest, with optional accessories such as armrests, a headrest, and a hanger. Many swivel chairs also have a reclining function that allows the backrest to tilt backward. This reclining function allows the sitter to relax and continue using the chair for long periods of time.

[0003] One of the important elements in maintaining comfort in a chair is the fit, cushioning, and softness of the backrest, so the front of the backrest is made of cushioning material or mesh material is used to support the body. Mesh material has the advantage of being highly breathable, preventing stuffiness.

[0004] While constructing a backrest using a mesh structure is beneficial in terms of breathability, mesh materials do not necessarily fit well to the body, and because mesh materials are made of woven or knitted fabrics, there are also problems with limited design freedom.

[0005] So, the backrest is was exposed The chair is constructed from a synthetic resin back panel, which is attached to a frame material, and has numerous perforations (open holes) opening at the front and back of the back panel, thereby ensuring breathability while improving the fit to the occupant; an example of this is disclosed in Patent Document 1.

[0006] In Patent Document 1, rows of diamond-shaped holes are formed in multiple stages aligned in the left-right direction, and the holes adjacent to each other above and below are staggered so that they are offset left and right, so that the group of band plate portions that separate the adjacent holes forms a diagonal lattice pattern overall. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-112728 Summary of the Invention [Problem to be solved by the invention]

[0008] In this way, when a group of perforations is formed in an exposed back panel, increasing the size of each perforation increases the transparency (transparency) of the back panel, giving the impression of an excellent fit and improving the lightness of the seat. However, in reality, there is a limit to the size of the perforations due to strength requirements. Therefore, it would be ideal if the transparency could be increased without compromising strength. However, prior art such as Patent Document 1 does not address this issue, let alone provide such a technique.

[0009] Furthermore, since the back panel needs to be thick to a certain extent, dust can accumulate on the inside of the holes, which then needs to be wiped off with a rag or mop. However, as mentioned above, the size of the holes cannot be made too large, so there is a problem that the rag or mop does not reach the inside of the holes, which can result in insufficient wiping.

[0010] The present invention aims to improve this current situation. [Means for solving the problem]

[0011] The present invention has many configurations, and typical examples are specified in each claim. Of these, the invention of claim 1 is as follows: "Front and rear The back plate has a back plate on which the back plate is exposed. In front view A backrest having a number of perforations arranged in multiple rows and columns and a number of band plate portions arranged in multiple rows and columns alternately with the perforations, each of the perforations having left and right inner surfaces and an upper surface and a lower surface, a pair of inclined surfaces inclined with respect to the front and rear surfaces in a plan cross-sectional view are formed on both the left and right sides of each of the band plate portions so as to enter into punching holes located on the left and right sides of the band plate portion, and each of the inclined surfaces intersects with the inner surfaces of the punching holes; The pair of left and right inclined surfaces of each band plate portion are arranged apart on the left and right sides with the overlapping portion of the front surface and the rear surface sandwiched between them in a front view, and the thickness of each portion where the inclined surfaces are formed gradually decreases from front to back toward the inner surface of the punching hole. " The structure is as follows.

[0012] The invention of claim 2 is a development example of claim 1, " The pair of inclined surfaces on the left and right sides of each of the band plate portions are separated into the front and rear surfaces of the band plate portion. It is being formed.” The structure is as follows.

[0013] The invention of claim 3 is a development example of claim 2, "The back plate is curved so as to be concave toward the front in a plan view, In front view In the area on the left side of the vertical center line of the back panel, The inclined surface is formed on the front surface of the right side of the band plate portion and the rear surface of the left side of the band plate portion, In the area to the right of the vertical center line, The inclined surface is formed on the front surface of the left side of the recording plate and on the rear surface of the right side of the recording plate. " The structure is as follows.

[0014] The invention of claim 4 is any one of claims 1 to 3, " Each of the strip portions has The punched holes The upper and lower edges sandwiched between At least one of the The vertical cross-sectional view is inclined so as to fit into the hole. There is a sloped surface The structure is as follows.

[0015] The invention of claim 5 is a development example of the invention of claim 4, " In each of the strip portions The punched holes The upper and lower edges sandwiched between At least one of 、 When viewed from the side in longitudinal section, it has a mountain-shaped slope at the front and rear. Therefore, in claim 5, at least one of the upper edge and the lower edge of the punched hole is formed to have a mountain-shaped cross section.

[0016] The invention of claim 6 is any one of claims 1 to 5, "Each of the above-mentioned holes is above They are rectangular with a long side and are arranged in multiple rows and columns in the vertical and horizontal directions. The groups of holes arranged adjacent to each other vertically are staggered so that they are shifted to the left and right, Or, The groups of holes arranged adjacent to each other on the left and right are staggered so as to be vertically shifted, or to The group of holes lined up on the left and right to Both the group of holes arranged side by side are staggered. The structure is as follows.

[0018] The invention of claim 7 relates to a chair, and this chair comprises: "A seat seated by a seated person, Legs supporting the seat; The present invention relates to a method for manufacturing a semiconductor device according to any one of claims 1 to 6. Back Lean on me.” It is equipped with: [Effects of the Invention]

[0019] Now, when people look at the back of a chair, they usually look at it from a slightly oblique angle. square In this case, when the backrest is viewed from directly in front, the area of ​​the perforation comes into view as it is, but when viewed from an oblique direction, the perforation is hidden by the edge of the rim, so the apparent opening area becomes smaller.

[0020] In contrast to this, in the present invention, the edge of the band plate is cut out by an inclined surface, so that the phenomenon of the punching hole being hidden by the edge can be suppressed even when viewed from an oblique direction. Remove The opening of the hole widened Like In this state, the apparent transparency of the perforations becomes high.

[0021] And the slope is Strip sectionBecause it is formed on the edge, the necessary cross-sectional area can be secured in the band plate portion between adjacent perforations, ensuring the necessary strength for the back panel. Therefore, the present invention can suppress the phenomenon of perforations being hidden due to the edges of the perforations blocking the view, and the effect of widening the opening reduces obstruction, thereby improving the transparency while ensuring the necessary strength for the back panel. As a result, it gives people the impression of lightness, cushioning, and excellent fit, improving the product value.

[0022] Also, if there is an inclined surface, the hole will be wider. It was like This makes it easier for rags and mops to reach the inside of the holes when cleaning. Therefore, if dust adheres, it is easier to wipe it off. If the number of individual holes is increased while the size of each hole is made smaller, the smaller the hole size, the more difficult it becomes to wipe off dust. However, by providing an inclined surface as in the present invention, dust can be easily wiped off even if the hole size is small, so the size of the holes can be reduced while still taking measures against dust. Therefore, design freedom is improved.

[0023] While the front view of a chair is important, the rear view is also important because the rear is usually visible when a person is seated. Therefore, it is meaningful to provide an inclined surface only on the front or rear of the back panel, but providing it on both the front and rear as in claim 2 is particularly preferable because it improves the sense of transparency in both the front and rear views. Furthermore, providing inclined surfaces on both the front and rear makes it easier for rags and mops to reach the inner surfaces of the holes from both the front and rear when cleaning, so the invention of claim 2 is also beneficial in terms of cleanability.

[0024] Back panels are often curved so that they are concave forward in plan view to fit the shape of a person's back, and this shape improves the fit to the body, but when the back panel is curved in plan view, the appearance of the holes differs when viewed from the right and when viewed from the left.

[0025] Therefore, providing an inclined surface on only one of the left and right sides of a perforation would result in an unbalanced appearance and would not necessarily be good from a design perspective. On the other hand, providing an inclined surface on both the left and right sides of each perforation would likely result in the plate portion being thinner than necessary, especially when the perforations are spaced closely together.

[0026] In contrast, the present application claims 3 By adopting this configuration, the posture and arrangement of the inclined surfaces are symmetrical, resulting in a balanced design and an aesthetically pleasing appearance, while also providing the effect of creating a sense of transparency. 3 It can be said that this invention is highly practical.

[0027] Since chairs are shorter than a person's height, people look down at the backrest to see the contents. Therefore, the upper and lower edges of the holes are also visible to the public, but by adopting the structure of claim 4, the sense of transparency when viewed from above can be improved. In addition, dust tends to adhere to the underside of the holes, so dust can easily accumulate on the underside of the holes, especially around the Bottom surface The provision of an inclined surface is particularly beneficial in terms of dust removal.

[0028] The invention of claim 5 is, as mentioned above, Top or bottom The cross section is formed in a mountain shape (including a trapezoid), which improves the sense of transparency in both the front and back views, and in particular, providing inclined surfaces on both the front and back sides of the lower edge is effective in preventing dust from adhering and is preferable because it makes it easier to reach with a rag or mop when cleaning.

[0029] In the present invention, the shape and arrangement of the holes can be set arbitrarily. Vertical rectangle This gives a simple and calm impression, making it highly popular. Furthermore, the areas between adjacent holes become bands, making it possible to make the degree of deformation per unit area uniform in each part of the back panel. Therefore, the back panel can be deformed in response to the pressure of the user, ensuring a high level of fit and cushioning.

[0030] Furthermore, since the adjacent bands on the left and right are arranged in a staggered pattern in the vertical direction, the length of the bands is longer than when the groups of holes are arranged in a straight line vertically, making it easier to deform the back panel, thereby further improving the fit and cushioning.

[0031] The angle of the inclined surface (edge ​​recess angle) and width dimensions can be set according to the size of the punched hole, but generally, About 50° It can be said that setting it to 1 allows people to perceive the transparency, and is therefore realistic. [Brief explanation of the drawings]

[0032] [Figure 1] 1A and 1B are diagrams showing a chair according to an embodiment, in which (A) is a perspective view seen from the front, (B) is a side view, (C) is a plan view, and (D) is a perspective view seen from the rear. [Figure 2] FIG. 1 is a front perspective view with the seat portion omitted. [Figure 3] (A) is a rear perspective view of the back plate, and (B) is a side view of the back plate. [Figure 4] (A) is an exploded perspective view of the back portion seen from the rear, and (B) is an exploded perspective view of the back portion seen from the front. [Figure 5] FIG. [Figure 6] 5, (B) is a partial cross-sectional view seen from the VIB-VIB direction in FIG. 5, and (C) is a partial enlarged view of (A). [Figure 7] This is a view of the backrest from below. DETAILED DESCRIPTION OF THE INVENTION

[0033] Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the terms "front, back, left, right" are used to specify directions, but these directions are specified as viewed from a normally seated person. The front viewing direction is the direction facing the seated person.

[0034] (1) Chair Overview First, an overview of the chair will be described. The chair of this embodiment is applied to a swivel chair that is widely used in offices, etc. As shown in Figures 1 and 2, the chair has, as its main components, a seat 1, a back panel 2, a back frame 3 to which the back panel 2 is attached, and a leg assembly 4. The back panel 2 is made of a soft resin material such as elastomer. In this embodiment, the back panel 2 is synonymous with the backrest.

[0035] The leg device 4 has a group of branch legs equipped with casters (only some of the casters are shown in Figures 1(A) and 1(D)). As shown in Figure 2, a base body 6 is fixed to a leg support (gas cylinder) 5 located in the center, and a back frame 3 is connected to the base body 6 via a joint member 7 so as to be able to tilt backward. More precisely, a forward-facing portion 3a is provided integrally with the lower end of the back frame 3, and the forward-facing portion 3a is fixed to the joint member 7, which is connected to the base body 6 via left and right longitudinal support shafts 8 so as to be able to tilt backward.

[0036] The support shaft 8 is rotatably held by the base body 6 via a torsion bar, which is an example of spring means. Therefore, the chair of this embodiment is a reclining type in which the back panel 2 tilts backward against the elastic means. The seat 1 has a structure in which cushioning material is placed on an inner shell (not shown) and covered with a cover material, and the inner shell is attached to an outer shell 9 shown in FIG. 1(B). The outer shell 9 is connected to the base body 6 and the joint member 7 so that it can rotate relative to the base body 6. Therefore, when the back panel 2 tilts backward, the seat 1 tilts backward in conjunction with the back panel 2 (synchronized).

[0037] As shown in Figure 4, the back frame 3 has a vertically elongated back support column 10 located in the left-right middle, a horizontally elongated upper support 11 attached to the top end of the column so as to be able to pivot horizontally, and left and right lower supports 12 integrally provided at the bottom end of the column 10. The upper support 11 pivots horizontally against a spring built into the column 10. The column 10 and upper support 11 are made of synthetic resin, but aluminum die-cast products or processed sheet metal products can also be used.

[0038] For example, as shown in Figure 4, the upper support 11 has a portion facing left and a portion facing right from the axis of the back support 10, and both portions are connected integrally, with both left and right ends being free ends. The upper support 11 has a bow-like shape in a plan view, concave toward the front (convex toward the rear), and both left and right ends of the back panel 2 are connected to its left and right ends. Therefore, a large space is left between the upper support 11 and the back panel 2. The existence of this space allows the upper end of the back panel 2 to expand backward (concave) due to the pressure (body pressure) of the seated person.

[0039] A plate-shaped upper reinforcing member 13, which is elongated in the left and right directions, is integrally fixed to the rear surface of the upper end of the back panel 2 by insert molding or two-color molding, and the left and right ends of the upper reinforcing member 13 are connected to the upper support 11 via clip bodies 14. Upper boss portions 15 that overlap the upper support 11 are provided on both left and right ends of the upper reinforcing member 13 and protrude rearward.

[0040] 4, the lower support 12 has upper and lower surfaces that curve upwards in rear view, and the lower surface (i.e., the lower surface of the back frame 3) formed by the lower surfaces of the left and right lower supports 12 and the lower surface of the back support 10 also curves downwards. Therefore, the back frame 3 as a whole has an anchor-like shape.

[0041] 1(D), the lower support 12 extends forward so as to embrace the rear of the seat in a plan view. The width of the lower support 12 narrows toward the tip in plan and rear views.

[0042] Lower reinforcing members 16, each extending left and right, are integrally fixed to the rear surface of the lower end of the back panel 2 by insert molding or two-color molding, and the left and right ends of the lower reinforcing members 16 are fixed to the ends of the lower supports 12 with screws 17 (see Figure 3). The lower reinforcing members 16 have a three-dimensional structure with numerous ribs, making them rigid. Lower bosses 18, which fit into the lower supports 12, protrude rearward from the left and right ends of the lower reinforcing members 16. The upper and lower reinforcing members 13, 16 are made of synthetic resins such as polypropylene, nylon resin, and polycarbonate.

[0043] As can be seen from Figure 4, the back surface of the back frame 3 is covered with a center cover 19 and a side cover 20. That is, the center cover 19 covers the entire back support 10 and part of the lower support 12, and the side cover 20 covers the back surface of the front half of the lower support 12. By removing the side cover 20, an armrest device can be attached to the lower support 12.

[0044] The back panel 2 is strong enough to be easily flexibly deformed by the pressure of a seated person leaning against it. To facilitate this deformation, the back panel 2 has multiple rows of perforations 21 formed in it. The lower end of the back panel 2 is fixed to the lower support 12 so that it cannot be deformed, while the upper end of the back panel 2 is attached to both left and right ends of the upper support 11, which can pivot horizontally. Therefore, when a person sitting in the chair twists their upper body, the lower support 12 pivots horizontally, causing the back panel 2 to bend or bend backward in response to the twisting of the body, thereby elastically deforming. Therefore, the upper reinforcing member 13 can be elastically deformed (bending) by the pressure of the user.

[0045] The lower support 12 is raised to a position higher than the seat 1. Therefore, as shown in Figures 1(A) and 1(B), left and right raised portions 1a are formed at the rear of the seat 1. This increases the ability of the seat 1 to hold the user's lower back (buttocks).

[0046] (2) Features of the back panel Next, the back panel 2 will be described in detail, mainly with reference to Figures 5 to 7. The perforations 21 are formed as rectangles elongated in the vertical direction, and are aligned in the left-right direction in each row. When viewed from above, adjacent perforations 21 are offset in the left-right direction. That is, the perforations 21 are aligned in a straight line in the left-right direction and are staggered in the up-down direction. Therefore, the groups of band plate portions 26 located between adjacent perforations 21 are also aligned in a straight line in the left-right direction and are staggered in the up-down direction. The punched hole 21 has a rectangular shape when viewed from the front, and has left and right inner surfaces 21a, an upper inner surface, and a lower inner surface.

[0047] As shown in Figure 6(A)(C), band Plate portion 26 On both the left and right sides The front inclined surface 23 and the rear inclined surface 24 have a shape like a cut edge. , are formed in a state separated on the left and right when viewed from the front (back) are. The inclined surfaces 23 and 24 are inclined toward the punched hole 21 in a plan cross-sectional view and intersect with the inner surface 21 a of the punched hole 21 . In this case, the front inclined surface 23 is located at the side edge farther from the longitudinal center line 25 that divides the back panel 2 into left and right halves. Formed The rear inclined surface 24 is formed on the side edge closer to the longitudinal center line 25. formed are.

[0048] In short, the left side of the vertical center line 25 Area The front inclined surface 23 is the hole 21 On the left side The rear inclined surface 24 is provided in the hole 21. On the right side On the other hand, on the right side of the longitudinal center line 25 Area The front inclined surface 23 is the hole 21 On the right side The rear inclined surface 24 is provided in the hole 21. On the left side Therefore, the front inclined surface 23 and the rear inclined surface 24 of the adjacent holes 21 on the left and right are positioned approximately parallel to each other. do.

[0049] Vertical center line 25 The holes 21 and the strip portions 26 are alternately arranged in the The holes 21 are arranged but are located at the longitudinal center line 25. The left and right band plate parts 26 Regarding each Front inclined surface 23 but The rear inclined surface 24 is not provided.

[0050] In conclusion, the front inclined surface 23 and the rear inclined surface 24 are provided symmetrically with respect to the longitudinal center line 25. And, A strip portion 26 located at the longitudinal center line 25 for The front inclined surface 23 and the rear inclined surface 24 are formed on the inner surface of the hole 21. 21a The angle θ formed with respect to the inclined surfaces 23 and 24 is about 50 degrees. The width W of the inclined surfaces 23 and 24 is slightly larger than the thickness T of the back plate 2.

[0051] As shown in FIG. 6(B), the upper and lower edges of each perforation 21 Department Looking at the lower edge Part (upper edge of strip part 26) are provided with front and rear inclined surfaces 27, 28, Upper edge of punched hole 21 (lower edge of band plate portion 26) No inclined surface is provided. Lower edge of punched hole 21 The upper ends of the front and rear inclined surfaces 27, 28 intersect. The upper edge of the strip portion 26 is The cross section is formed in a mountain shape.

[0052] (3) Summary As described above, in this embodiment, Left and right sides of each band plate The inclined surfaces 23, 24 prevent the holes 21 from being hidden by the edges when a person looks at the back panel 2 from an oblique direction, and improve the transparency of the back panel 2 without excessively reducing the cross-sectional area of ​​the band panel portion 26. As a result, the back panel 2 is given the impression of having excellent fit and cushioning while maintaining the necessary strength, thereby improving the commercial value of the chair. As already mentioned, this is also useful for removing dust.

[0053] The inclined surfaces 23 and 24 are used to cut the edges. Toshi Therefore, the opening of the hole 21 is wide. Like This also contributes to improving the transparency of the back panel 2. Providing the inclined surfaces 23, 24 on both the front and back sides as in this embodiment is particularly preferable because it improves the transparency in both the front view and the back view.

[0054] In addition, as in this embodiment, the punched holes 21 Lower edge (upper edge of band plate 26) Inclined surfaces 27 and 28 are also provided. Can This not only contributes to improving the transparency but also prevents dust from adhering (accumulating), which is advantageous. Form This is more preferable in terms of preventing dust from adhering and facilitating wiping off.

[0055] In this embodiment, upper reinforcing member 13 is fixed to the rear surface of the upper part of back panel 2, but because upper reinforcing member 13 has a certain vertical width, perforations 21 are not open in the portion where upper reinforcing member 13 is fixed. However, because the group of perforations 21 extends to the left and right side edges of back panel 2, if the front surface of back panel 2 were simply made flat where upper reinforcing member 13 is located, a wide margin would be provided at the upper end of the front surface of back panel 2, which would cause an imbalance with the left and right sides and a deterioration in aesthetics.

[0056] In this regard, in this embodiment, as shown in Figures 5 and 7, rectangular recessed grooves (dummy grooves) 29 are formed in each of the upper row perforations 21 by extending the perforations 21 upward, making it appear as if the perforations 21 extend to the upper edge of the back panel 2. This maintains the strength of the upper end of the back panel 2 while creating a sense of spaciousness for the group of perforations 21, ensuring a beautiful appearance.

[0057] Although the embodiments of the present invention have been described above, the present invention can be embodied in a variety of other ways. For example, the shape of the perforations 21 is not limited to a vertically elongated rectangle, and various shapes such as a square or a vertically elongated oval can be adopted. Different shapes can also be combined. In the embodiment, the back frame has a single support pillar, but various shapes can be adopted, such as a square shape with left and right side frames or a Y-shape. [Industrial Applicability]

[0058] The present invention can be embodied in a chair, and therefore has industrial applicability. [Explanation of symbols]

[0059] 2 Back plate 3 Back Frame 10 Back strut 11 Upper Support 12 Lower support 13 Upper reinforcement member 16 Lower reinforcement member 21 Perforation 21a Inner surface 23 Front inclined surface 24 Rear slope 25 Vertical center line 26 Band part 27 Front slope of lower edge 28 Rear slope of lower edge 29 Groove

Claims

1. A backrest having a back panel with exposed front and rear surfaces, the back panel having a number of perforations arranged in multiple rows and columns when viewed from the front, and a number of band plate portions arranged in multiple rows and columns alternately with the perforations, each of the perforations having left and right inner surfaces and an upper surface and a lower surface, a pair of inclined surfaces inclined with respect to the front and rear surfaces in a plan cross-sectional view are formed on both the left and right sides of each of the band plate portions so as to enter into punching holes located on the left and right sides of the band plate portion, and each of the inclined surfaces intersects with the inner surfaces of the punching holes; The pair of left and right inclined surfaces of each of the band plate portions are arranged apart from each other on the left and right sides of the overlapping portion of the front surface and the rear surface when viewed from the front, and the thickness of each portion where the inclined surfaces are formed gradually decreases toward the inner surface of the punching hole. Chair back.

2. The pair of left and right inclined surfaces of each of the band plate portions are formed separately on the front and rear surfaces of the band plate portion, 2. The chair back of claim 1.

3. The back plate is curved so as to be concave forward in a plan view, In a front view, in an area on the left side of the longitudinal center line of the back plate, the inclined surface is formed on the front surface of the right side of the band plate portion and the rear surface of the left side of the band plate portion, and in a front view, in an area on the right side of the longitudinal center line, the inclined surface is formed on the front surface of the left side of the band plate portion and the rear surface of the right side of the band plate portion. A chair back according to claim 2.

4. Each of the strip plate portions has an inclined surface inclined in a longitudinal side view so as to fit into the perforation on at least one of the upper and lower edge portions sandwiching the perforation. A chair back according to any one of claims 1 to 3.

5. In each of the band plate portions, at least one of the upper and lower edge portions sandwiching the punched hole has a front and rear inclined surface that forms a mountain shape when viewed from the longitudinal side.

5. The chair back according to claim 4.

6. The holes are rectangular and are arranged in multiple rows and columns in the vertical and horizontal directions. The groups of perforations lined up adjacent to each other vertically are staggered so as to be shifted left and right, or the groups of perforations lined up adjacent to each other horizontally are staggered so as to be shifted up and down, or both the groups of perforations lined up vertically and the groups of perforations lined up horizontally are staggered. A chair back according to any one of claims 1 to 5.

7. A seat to be seated by a seated person, Legs supporting the seat; A backrest according to any one of claims 1 to 6; A chair equipped with:

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