chair

Abstract

To provide a chair provided with a backrest which ensures rigidity as the backrest and can suitably achieve an appearance of knitting a vertical belt and a lateral belt.SOLUTION: In a chair, a backrest base part 1 of a backrest body F is provided with a plurality of vertical belt area parts 11 and lateral belt area parts 12. A connecting part (R1, R2) has a substantially rectangular shape with constitutions of the vertical belt area part 11 and the lateral belt area part 12 and is constituted of a first connecting part R1 where a groove h1 which is a pair of upper and lower partitioning elements for visually partitioning a boundary part with a vertical belt part 111 is disposed and a second connecting part R2 where a groove h2 which is a pair of right and left partitioning elements for visually partitioning a boundary part with a lateral belt part 121 is disposed. The first connecting part R1 and the second connecting part R2 are alternately arranged in each vertical belt area part 11 and each lateral belt area part 12 in a vertical direction and a lateral direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] 2. Description of the Related Art Chairs having a backrest body integrally formed from synthetic resin have been known (see, for example, Patent Document 1).

[0003] The backrest must have a certain degree of rigidity in order to withstand the weight of the user. Also, since the backrest is a part that is particularly visible to the user, it is desirable for it to have a good appearance. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-119219 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in light of the above-mentioned circumstances, and its object is to provide a chair with a backrest that can preferably achieve an appearance of woven vertical and horizontal bands while at least ensuring the rigidity of the backrest. [Means for solving the problem]

[0006] That is, the present invention has the following configuration.

[0007] The invention described in claim 1 is a chair equipped with a backrest having a backrest main body integrally formed from a synthetic resin, the backrest main body having a backrest surface and a plurality of vertical band parts extending in the up-down direction arranged at regular intervals in the left-right direction, and a plurality of horizontal band parts having a backrest surface and extending in the left-right direction arranged at regular intervals in the up-down direction, the backrest base having a lattice-like appearance formed by these vertical band parts and horizontal band parts, the vertical band parts being vertical band parts with exposed left and right end edges and connecting parts adjacent to the vertical band parts arranged alternately in the up-down direction, the horizontal band parts being vertical band parts with exposed left and right end edges and connecting parts adjacent to the vertical band parts arranged alternately in the up-down direction, The horizontal band portion having both exposed end edges and the connecting portion adjacent to the horizontal band portion are alternately arranged in the left-right direction, the connecting portion is substantially rectangular and serves as both the configuration of the vertical band portion and the configuration of the horizontal band portion, the multiple connecting portions are composed of a first connecting portion having a pair of upper and lower partition elements arranged therein that can visually separate the boundary portion with the vertical band portion, and a second connecting portion having a pair of left and right partition elements arranged therein that can visually separate the boundary portion with the horizontal band portion, and the first connecting portion and the second connecting portion are alternately arranged in the up-down direction and the left-right direction in each vertical band portion and each horizontal band portion. The upper and lower partition elements are grooves extending in the left-right direction, and the left and right partition elements are grooves extending in the up-down direction. It's a chair.

[0008] The invention described in claim 2 is a chair equipped with a backrest having a backrest main body integrally formed from a synthetic resin, the backrest main body having a backrest surface and a plurality of vertical band parts extending in the up-down direction arranged at regular intervals in the left-right direction, and a plurality of horizontal band parts having a backrest surface and extending in the left-right direction arranged at regular intervals in the up-down direction, the backrest base part having a lattice-like appearance formed by these vertical band parts and horizontal band parts, the vertical band parts being vertical band parts with exposed left and right end edges and connecting parts adjacent to the vertical band parts arranged alternately in the up-down direction, the horizontal band parts being vertical band parts with exposed left and right end edges and connecting parts adjacent to the vertical band parts arranged alternately in the up-down direction, The horizontal band portion having both exposed end edges and the connecting portion adjacent to the horizontal band portion are alternately arranged in the left-right direction, the connecting portion is substantially rectangular and serves as both the configuration of the vertical band portion and the configuration of the horizontal band portion, the multiple connecting portions are composed of a first connecting portion having a pair of upper and lower partition elements arranged therein that can visually separate the boundary portion with the vertical band portion, and a second connecting portion having a pair of left and right partition elements arranged therein that can visually separate the boundary portion with the horizontal band portion, and the first connecting portion and the second connecting portion are alternately arranged in the up-down direction and the left-right direction in each vertical band portion and each horizontal band portion. the backrest body comprises left and right side frame portions, an upper frame portion connecting the upper portions of the left and right side frame portions, a lower frame portion connecting the lower portions of the side frame portions, and an intermediate connecting portion connecting the left and right side frame portions while forming a cavity between the lower frame portion and the intermediate connecting portion, the peripheral portion of the backrest base is connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion, the side edges of the horizontal belt portion are connected to the left and right side frame portions, the upper edge of the vertical belt portion is connected to the upper frame portion, and the lower edge of the vertical belt portion is connected to the intermediate connecting portion, and the horizontal band portion, a side partition element capable of visually separating the left and right side frame portions from the horizontal band portion is provided, an upper partition element capable of visually separating the upper frame portion from the vertical band portion is provided at the boundary between the upper frame portion and the vertical band portion, and a lower partition element capable of visually separating the intermediate connecting portion from the vertical band portion is provided at the boundary between the intermediate connecting portion and the vertical band portion, the side partition element being a step or groove extending in the up-down direction, the upper partition element being a step or groove extending in the left-right direction, and the lower partition element being a step or groove extending in the left-right direction. It's a chair.

[0009] The invention described in claim 3 is a chair described in claim 1 or 2, in which the vertical belt portion, the horizontal belt portion, and the first and second connecting portions each have a backrest surface facing forward, and each of these backrest surfaces is set in a position that coincides with a virtual backrest surface that is approximately flush with the chair.

[0010] The invention described in claim 4 is a chair as described in claim 1, wherein the backrest main body comprises left and right side frame portions, an upper frame portion connecting the upper parts of the left and right side frame portions, a lower frame portion connecting the lower parts of the side frame portions, and an intermediate connecting portion connecting the left and right side frame portions while forming a cavity between the lower frame portions, and wherein the peripheral portion of the backrest base is connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion.

[0011] The invention described in claim 5 is such that side edges of the horizontal band portion are connected to the left and right side frame portions, and an upper edge of the vertical band portion is connected to the upper frame portion, 5. The chair according to claim 4, wherein the lower end edge of the vertical belt portion is connected to the intermediate connecting portion.

[0012] The invention described in claim 6 is a chair described in claim 5, in which a side partition element is provided at the boundary between the left and right side frame portions and the horizontal band portion, which can visually separate the left and right side frame portions and the horizontal band portion, an upper partition element is provided at the boundary between the upper frame portion and the vertical band portion, which can visually separate the upper frame portion and the vertical band portion, and a lower partition element is provided at the boundary between the intermediate connecting portion and the vertical band portion, which can visually separate the intermediate connecting portion and the vertical band portion.

[0013] The invention described in claim 7 is the chair described in claim 6, wherein the side partition element is a step or groove extending in the vertical direction, the upper partition element is a step or groove extending in the left-right direction, and the lower partition element is a step or groove extending in the left-right direction.

[0014] The invention described in claim 8 is a chair described in claims 1, 2, 3, 4, 5, 6 or 7, wherein the backrest base has the vertical band portions arranged at six points at a regular interval in the left-right direction and the horizontal band portions arranged at eight points at a regular interval in the up-down direction.

[0015] The invention described in claim 9 is the chair described in claim 1, 2, 3, 4, 5, 6, 7 or 8, in which the seat is disposed on a support base and the backrest is supported by the support base via a back support member. Effect of the Invention

[0016] As described above, according to the present invention, it is possible to provide a chair equipped with a backrest that can preferably achieve the appearance of woven vertical and horizontal bands while at least ensuring the rigidity of the backrest. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] XX line end view in FIG. 3. [Figure 9] An enlarged view of part Z in Figure 8. [Figure 10] 4 is an end view of line YY in FIG. 3. [Figure 11] An enlarged view of part W in FIG. [Figure 12] FIG. 2 is a perspective view of the embodiment (with the back cover attached). [Figure 13] FIG. 1 is a perspective view of the embodiment (with back cover attached); [Figure 14] FIG. [Figure 15] FIG. [Figure 16] FIG. 4 is a perspective view of the front engagement member in the embodiment as viewed from the rear side. [Figure 17] FIG. 4 is a front perspective view of a rear engagement member in the embodiment; [Figure 18] FIG. [Figure 19] FIG. [Figure 20] FIG. 13 is an explanatory diagram seen from the rear for illustrating a manner in which the front engagement member and the cover main body (front cover portion) are attached in this embodiment. [Figure 21]FIG. 13 is an explanatory diagram for explaining a manner in which the rear engagement member and the cover main body (rear cover portion) are attached to each other in the embodiment, as viewed from the front side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, one embodiment of the present invention will be described with reference to FIGS.

[0019] In this embodiment, the present invention is applied to a swivel chair for business use (hereinafter simply referred to as a "chair") suitable for use in an office or the like.

[0020] The chair comprises legs A, a support base B supported so as to be rotatable with respect to the legs A, a seat C disposed on the support base B, and a backrest E supported so as to be tiltable backward with respect to the support base B via a back support D.

[0021] The backrest E has a backrest body F integrally formed from synthetic resin and a back cover G that covers the backrest body F. The backrest E can be used in two different ways: with the backrest base 1 exposed to the outside, and with the back cover G covering the backrest body F so as to conceal the backrest base 1.

[0022] <<Backrest body F>> The backrest main body F comprises left and right side frame portions 2 extending in the vertical direction, an upper frame portion 3 connecting the upper parts of the left and right side frame portions 2, a lower frame portion 4 connecting the lower parts of the left and right side frame portions 2, an intermediate connecting portion 5 connecting the left and right side frame portions 2 while forming a cavity kd between the lower frame portion 4, and a backrest base 1 having a backrest surface m and whose peripheral portion is connected to the left and right side frame portions 2, the upper frame portion 3, and the intermediate connecting portion 5.

[0023] The backrest body F has left and right side frame parts 2, an upper frame part 3, a lower frame part 4, an intermediate connecting part 5, and a backrest base part 1, which are integrally formed from synthetic resin. The backrest body F has a frame part W with a cavity kd formed therein by the left and right side frame parts 2, the lower frame part 4, and the intermediate connecting part 5.

[0024] <Left and right side frame parts 2> The left and right side frame portions 2 are frame-like and have a generally "L" shape in a side view. The component portion of the left side frame portion 2 located between the upper frame portion 3 and the intermediate connecting portion 5 and the component portion of the right side frame portion 2 located between the upper frame portion 3 and the intermediate connecting portion 5 are set so as to gradually separate from each other toward the bottom in a front view (so as to gradually move closer to each other toward the top). Each of the left and right side frame portions 2 is in the shape of a strip extending in the vertical direction. Each of the left and right side frame portions 2 is formed so that the left and right width dimension gradually becomes shorter toward the top in a front view. The thickness dimension in the front-rear direction of the left and right side frame portions 2 is set to be longer than the thickness dimension of the backrest base portion 1.

[0025] <Top frame part 3> The upper frame portion 3 is frame-shaped and extends substantially horizontally in the left-right direction when viewed from the front. The upper frame portion 3 is in the shape of a band extending in the left-right direction. The upper frame portion 3 has a substantially equal vertical width over substantially the entire left-right area. The thickness dimension of the upper frame portion 3 in the front-rear direction is set to be longer than the thickness dimension of the backrest base portion 1.

[0026] <Lower frame part 4> The lower frame portion 4 forms a main portion that connects the lower portions of the left and right side frame portions 2 and connects to the back support body D. The lower frame portion 4 is provided with a back support body connecting portion 41 having a recessed shape that is open forward and is used for connecting to the rear ends of the pair of support arms d1 in the back support body D.

[0027] The back support connecting portion 41 includes a flat upper wall portion 411 disposed on the rear portion of the back support D, left and right side wall portions 412 extending downward from the upper wall portion 411 and disposed outside the support arm d1 of the back support D, a rear wall portion 413 extending downward from the rear edge of the upper wall portion 411 and disposed on the rear end edge side of the back support D, and a bottom wall portion 414 extending forward from the lower end edge of the rear wall portion 413. The rear wall portion 413 is formed with a screw insertion hole n through which a screw (not shown) that is screwed into the back support D can be inserted. In addition, a recessed portion 415 for accommodating the head of the screw is provided on the back side of the rear wall portion 413, and the recessed portion 415 is adapted to be closed by a concealing cap P.

[0028] <Intermediate connection part 5> The intermediate connecting portion 5 is disposed between the portions of the left and right side frame portions 2 that are tilted forward in side view. The intermediate connecting portion 5 is in the shape of a band extending in the left-right direction. The intermediate connecting portion 5 has a substantially equal vertical width over substantially the entire left-right area. The intermediate connecting portion 5 extends in the left-right direction and has a curved shape that is convex downward in front view. The front-rear thickness dimension of the intermediate connecting portion 5 is set to be longer than the front-rear thickness dimension of the backrest base portion 1 and shorter than the front-rear thickness dimension of the left and right side frame portions 2.

[0029] <Backrest base 1> The backrest base 1 is integrally connected to a frame portion surrounding its periphery, namely, a rectangular frame portion constituted by left and right side frame portions 2, an upper frame portion 3, and an intermediate connecting portion 5.

[0030] The backrest base 1 is composed of multiple vertical band sections 11, each having a backrest surface m and extending in the vertical direction, arranged at regular intervals in the left-right direction, and multiple horizontal band sections 12, each having a backrest surface m and extending in the left-right direction, arranged at regular intervals in the vertical direction, and these vertical band sections 11 and horizontal band sections 12 form a lattice-like appearance.

[0031] The vertical band portion 11 is formed by vertical band portions 111 with both left and right end edges exposed and connecting portions (first connecting portion R1 and second connecting portion R2) adjacent to the vertical band portions 111, which are arranged alternately in the up-down direction. In this embodiment, the backrest base 1 has six vertical band portions 11 arranged approximately parallel to each other at regular intervals in the left-right direction. On the left and right sides of the vertical band portions 111, adjacent through holes are provided that penetrate in the front-rear direction.

[0032] The left-right width of the vertical band portion 111 in the vertical band portion 11 and the top-bottom width of the horizontal band portion 121 in the horizontal band portion 12 are substantially the same.

[0033] Of the multiple vertical belt portions 111, the upper edge of the uppermost vertical belt portion 111 is connected to the lower edge of the upper frame portion 3. At the boundary between the upper frame portion 3 and the vertical belt portions 111, a step portion h4 extending in the left-right direction is provided as an upper partition element that can visually separate the upper frame portion 3 and the vertical belt portions 111.

[0034] Of the multiple vertical belt portions 111, the lower edge of the vertical belt portion 111 located at the bottom is connected to the upper edge of the intermediate connecting portion 5. At the boundary between the intermediate connecting portion 5 and the vertical belt portions 111, a step portion 5 extending in the left-right direction is provided as a lower partition element that can visually separate the intermediate connecting portion 5 and the vertical belt portions 111.

[0035] The horizontal band portion 12 is formed by horizontal band portions 121 with both upper and lower end edges exposed and connecting portions (first connecting portion R1 and second connecting portion R2) adjacent to the horizontal band portions 121, which are arranged alternately in the left-right direction. In this embodiment, the backrest base 1 has eight horizontal band portions 12 arranged approximately parallel to each other at regular intervals in the left-right direction. Adjacent to the top and bottom of the horizontal band portion 121 are through-holes that penetrate in the front-rear direction.

[0036] Of the multiple horizontal bands 121, the outer edge of the horizontal band 121 located on the outermost side is connected to the inner edges of the left and right side frame portions 2. At the boundaries between the left and right side frame portions 2 and the horizontal bands 121, step portions h3 extending in the vertical direction are provided as side partition elements that can visually separate the left and right side frame portions 2 and the horizontal bands 121.

[0037] Next, the connecting portions (first connecting portion R1 and second connecting portion R2) that can constitute both the vertical band portion 11 and the horizontal band portion 12 in the backrest base portion 1 will be described in detail.

[0038] The connecting portion (first connecting portion R1 / second connecting portion R2) is substantially rectangular and serves as both the vertical band portion 11 and the horizontal band portion 12. The multiple connecting portions (first connecting portion R1 / second connecting portion R2) are composed of a first connecting portion R1 in which a groove h1 extending substantially linearly in the left-right direction is disposed as a pair of upper and lower partition elements that can visually separate the boundary portion with the vertical band portion 111 when viewed from the front, and a second connecting portion R2 in which a groove h2 extending substantially linearly in the up-down direction is disposed as a pair of left-right partition elements that can visually separate the boundary portion with the horizontal band portion 121 when viewed from the front.

[0039] The first connecting portions R1 and the second connecting portions R2 are alternately arranged in the up-down and left-right directions in each vertical band portion 11 and each horizontal band portion 12 with the vertical band portions 111 or the horizontal band portions 121 interposed therebetween.

[0040] More specifically, with regard to each vertical band portion 11, the vertical band portion 11 in the left-right center (fourth from the left and right) is alternately arranged in the following order from the upper frame portion 3 side toward the intermediate connecting portion 5 side: vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111.

[0041] On the other hand, the vertical band portions 11 on the left and right (third from the left and third from the right) of the vertical band portion 11 in the left-right center are alternately arranged in the following order from the upper frame portion 3 side to the intermediate connecting portion 5 side: vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111, first connecting portion R1, vertical band portion 111, second connecting portion R2, vertical band portion 111.

[0042] More specifically, with regard to each horizontal band portion 12, the horizontal band portion 12 in the vertical center (fifth from the top and bottom) is alternately arranged in the following order from the left side frame portion 2 side to the right side frame portion 2 side when viewed from the front: horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121.

[0043] On the other hand, the horizontal band portions 12 adjacent above and below (fourth from the top and fourth from the bottom) the horizontal band portion 12 in the vertical center are alternately arranged in the following order from the left side frame portion 2 side to the right side frame portion 2 side when viewed from the front: horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121, second connecting portion R2, horizontal band portion 121, first connecting portion R1, horizontal band portion 121.

[0044] The vertical belt portion 111, the horizontal belt portion 121, and the first and second connecting portions R1 and R2 each have a backrest surface m facing the front. The vertical belt portion 111, the horizontal belt portion 121, and the first and second connecting portions R1 and R2 each have a backrest surface m that faces the front. The backrest surfaces m of the vertical belt portion 111, the horizontal belt portion 121, and the first and second connecting portions R1 and R2 are set at positions that match the imaginary backrest surface S that is substantially flush. Note that the position of the imaginary backrest line S shown in Figs. 9 and 11 is shown shifted slightly forward from the backrest surface m for ease of viewing. In other words, the backrest base 1 is set to be substantially flush, except for the grooves h1 and h2 formed in the first and second connecting portions R1 and R2.

[0045] The rear side of the backrest base 1 has an appearance based on the same configuration as the front side, except that it does not have a backrest surface m.

[0046] Next, the back cover G attached to the backrest body F will be described in detail.

[0047] <<Back cover G>> The back cover G comprises a downward-facing bag-shaped cover body 6 having an opening K at its lower end into which the backrest body F is inserted, and a front engagement member 7 and a rear engagement member 8 attached to the front and rear inner surfaces of the cover body 6 near the opening K. The front engagement member 7 and the rear engagement member 8 engage with the intermediate connection portion 5 of the backrest body F, enabling the lower portion of the cover body 6 to be positioned relative to the backrest body F.

[0048] The back cover G is attached to the backrest body F with the cover body 6 left open downward. In other words, the back cover G is used with the opening K of the cover body 6 left open downward without closing the opening K with an opening closing means such as a fastener or a hook.

[0049] <Cover body 6> The cover body 6 is formed by disposing a sheet-like cushioning material (not shown) on the inner side of the skin material J. The cover body 6 is mainly made of the skin material J, which is a stretchable material. The cover body 6 includes a front cover part 61 located in front of the backrest body F, and a rear cover part 62 located behind the backrest body F. The front cover part 61 and the rear cover part 62 are sewn together or integrally connected at their left and right side edges and at their upper edges so that an opening K is formed only at the lower end part.

[0050] <Front engagement member 7> The front engaging member 7 is made of synthetic resin. The front engaging member 7 includes a front engaging member main body 71 having an upright plate shape, a plurality (three) of first engaging portions 72 protruding from the front engaging member main body 71, and a plurality (two) of first positioning protrusions 73 protruding from the front engaging member main body 71 and capable of engaging with a plurality of first through holes k1 formed in the backrest main body F.

[0051] [Front engagement member body 71] The front engagement member body 71 is in the form of a flexible plate that stands upright and extends in the left-right direction. The front engagement member body 71 is flexible when engaging with or disengaging from the backrest body F. The rear surfaces of the upper part and the vertically intermediate part of the front engagement member body 71 are adapted to be brought into contact with the front surface of the intermediate connecting part 5 of the backrest body F and the front surface of the lowermost vertical belt part 111 connected to the intermediate connecting part 5. The rear surface of the lower part of the front engagement member body 71 is adapted to face the cavity kd of the backrest body F.

[0052] The front engagement member main body 71 is formed with first interference avoidance holes 711 each having a horizontally elongated rectangular shape for avoiding interference with the front engagement portion 822 of the second engagement portion 82 of the rear engagement member 8. The first interference avoidance holes 711 are provided in two locations, on the left and right. The first interference avoidance holes 711 are formed between a plurality of first engagement portions 72 arranged at regular intervals in the left-right direction.

[0053] A first sewn portion 712 that is sewn to the cover body 6 is provided at the lower portion of the front engaging member body 71. The first sewn portion 712 is disposed below the first engaging portion 72 of the front engaging member body 71. The lower end portion of the front cover portion 61 of the cover body 6 is sewn to the first sewn portion 712.

[0054] The lower end of the front cover part 61 covers the lower edge of the front engaging member main body 71 from the front side, with the end portion st being located on the rear side of the lower part of the front engaging member main body 71. The portions of the lower end of the front cover part 61 located on the front and rear sides of the first sewn part 712 are sewn together to the first sewn part 712.

[0055] [First engaging part 72] The first engagement portion 72 is flexible enough to be engaged with the portion constituting the backrest main body F, i.e., the lower edge of the intermediate connecting portion 5, which projects rearward from the front engagement member main body 71. The first engagement portion 72 is flexible enough to be temporarily displaced relative to the front engagement member main body 71. The first engagement portion 72 is hook-shaped and includes a first lower engagement portion 721 extending rearward from the front engagement member main body 71 and a rear engagement portion 722 standing upright from the extended end of the first lower engagement portion 721.

[0056] The first engagement portion 72 cooperates with the front engagement member main body 71 to hold the lower end portion of the intermediate connecting portion 5 from below.

[0057] The first engagement portion 72 of the front engagement member 7 and the second engagement portion 82 of the rear engagement member 8 are disposed at positions where they do not interfere with each other.

[0058] [First positioning protrusion 73] The first positioning protrusion 73 can engage with an opening edge of a rectangular first through hole k1 penetrating in the front-rear direction, which is formed on the intermediate connecting portion 5 of the backrest body F. In this embodiment, the first positioning protrusions 73 are disposed at two locations, left and right, on the front engagement member body 71.

[0059] The first positioning protrusion 73 has an upward U-shape. More specifically, the first positioning protrusion 73 includes left and right standing walls 731 and a connecting wall 732 connecting the lower ends of the left and right standing walls 731. The outer surface portions of the left and right standing walls 731 and the lower surface portion of the connecting wall 732 of the first positioning protrusion 73 engage with the opening edges of the first through holes k1 formed at the corresponding positions, thereby positioning the front engagement member 7 with respect to the backrest body F.

[0060] The first through hole k1 is constituted by the intermediate connecting portion 5, the left and right vertical band portions 111 whose lower ends are connected to the intermediate connecting portion 5, and the horizontal band portion 121.

[0061] The first positioning projection 73 of the front engaging member 7 and the second positioning projection 83 of the rear engaging member 8 are disposed at positions where they do not interfere with each other.

[0062] <Rear engaging member 8> The rear engaging member 8 is made of synthetic resin. The rear engaging member 8 includes a rear engaging member main body 81 having an upright plate shape, a plurality (two) of second engaging portions 82 protruding from the rear engaging member main body 81, and a plurality (four) of second positioning protrusions 83 protruding from the rear engaging member main body 81 and capable of engaging with a plurality of second through holes k2 formed in the backrest main body F.

[0063] [Rear engagement member body 81] The rear engaging member body 81 is in the form of a flexible plate that stands upright and extends in the left-right direction. The rear engaging member body 81 is flexible when engaging with or disengaging from the backrest body F. The front surfaces of the upper part and the vertical middle part of the rear engaging member body 81 are adapted to be in contact with the rear surface of the intermediate connecting part 5 of the backrest body F and the rear surface of the lowermost vertical belt part 111 connected to the intermediate connecting part 5. The front surface of the lower part of the rear engaging member body 81 is adapted to face the cavity kd of the backrest body F.

[0064] The rear engagement member main body 81 is formed with second interference avoidance holes 811 in a horizontally elongated rectangular shape for avoiding interference with the rear engagement portion 722 of the first engagement portion 72 of the front engagement member 7. The second interference avoidance holes 811 are provided in three locations: in the center and on the left and right. The second interference avoidance holes 811 are formed between two second engagement portions 82 arranged side by side at a fixed interval in the left-right direction and on the outer sides of the two second engagement portions 82.

[0065] A second sewn portion 812 that is sewn to the cover body 6 is provided at the lower part of the rear engaging member body 81. The second sewn portion 812 is disposed below the second engaging portion 82 of the rear engaging member body 81. The lower end of the rear cover portion 62 of the cover body 6 is sewn to the second sewn portion 812.

[0066] The lower end of the rear cover part 62 covers the lower edge of the rear engaging member main body 81 from the rear side, with a terminal end portion st being located on the front side of the lower part of the rear engaging member main body 81. The portions of the lower end of the rear cover part 62 located on the front and rear sides of the second sewn part 812 are sewn together to the second sewn part 812.

[0067] [Second engaging part 82] The second engaging portion 82 is flexible enough to engage with the portion constituting the backrest main body F, i.e., the lower edge of the intermediate connecting portion 5, which protrudes forward from the rear engaging member main body 81. The second engaging portion 82 is flexible enough to be temporarily displaced relative to the rear engaging member main body 81. The second engaging portion 82 is hook-shaped and includes a second lower engaging portion 821 extending forward from the rear engaging member main body 81 and a front engaging portion 822 erected from the extending end of the second lower engaging portion 821.

[0068] The second engaging portion 82 cooperates with the rear engaging member main body 81 to hold the lower end of the intermediate connecting portion 5 from below.

[0069] The second engagement portion 82 of the rear engagement member 8 and the first engagement portion 72 of the front engagement member 7 are disposed at positions where they do not interfere with each other.

[0070] [Second positioning protrusion 83] The second positioning protrusion 83 can engage with the opening edge of a rectangular second through hole k2 penetrating in the front-rear direction, which is formed on the intermediate connecting portion 5 of the backrest main body F. In this embodiment, the second positioning protrusions 83 are provided at two locations spaced apart from each other in the left-right central portion of the rear engaging member main body 81, and at the left and right end portions of the rear engaging member main body 81, respectively.

[0071] The second positioning protrusion 83 has an upward U-shape. More specifically, the second positioning protrusion 83 includes left and right standing walls 831 and a connecting wall 832 connecting the lower ends of the left and right standing walls 831. The outer surfaces of the left and right standing walls 831 and the lower surface of the connecting wall 832 of the second positioning protrusion 83 engage with the opening edge of a second through hole k2 formed at the corresponding position, thereby positioning the rear engagement member 8 with respect to the backrest body F.

[0072] The two second through holes k2 formed in the left-right middle of the backrest body F are composed of the intermediate connecting part 5, the left and right vertical belt parts 111 whose lower ends are connected to the intermediate connecting part 5, and the horizontal belt part 121. The two second through holes k2 formed on both the left and right sides of the backrest body F are composed of the intermediate connecting part 5, the side frame part 2, the vertical belt part 111 whose lower ends are connected to the intermediate connecting part 5, and the horizontal belt part 121.

[0073] The second positioning projection 83 of the rear engagement member 8 and the first positioning projection 73 of the front engagement member 7 are disposed at positions where they do not interfere with each other.

[0074] The chair described above has a backrest surface m and first and second connecting portions R1, R2, which have grooves h1, h2 as partition elements that are positioned and extend in different directions, and are arranged alternately in the vertical and horizontal directions in each vertical band portion 11 and each horizontal band portion 12.Therefore, it is possible to provide a chair equipped with a backrest main body F that can ideally achieve the appearance of woven vertical and horizontal bands.

[0075] Furthermore, with the above-described chair, it is possible to provide a chair having a configuration in which the back cover G can be suitably attached to the backrest main body F.

[0076] As described above, the chair according to this embodiment includes a backrest E having a backrest body F integrally formed from synthetic resin. The backrest body F includes a backrest base 1 having a lattice-like appearance formed by the vertical band parts 11 and the horizontal band parts 12, each having a backrest surface m and extending in the vertical direction, arranged at regular intervals in the left-right direction. The vertical band parts 11 and the horizontal band parts 12 form a lattice-like appearance. The vertical band parts 11 are formed by vertical band parts 111 with both left and right end edges exposed and connecting parts adjacent to the vertical band parts 111, which are arranged alternately in the vertical direction. The horizontal band parts 12 are formed by horizontal band parts 121 with both upper and lower end edges exposed and connecting parts adjacent to the horizontal band parts 121, which are arranged alternately in the left-right direction.

[0077] The connecting portion is substantially rectangular and serves as both the vertical band portion 11 and the horizontal band portion 12, and the multiple connecting portions are composed of a first connecting portion R1 in which a linear groove h1 extending in the left-right direction is disposed as a pair of upper and lower partition elements capable of visually separating the boundary portion with the vertical band portion 111, and a second connecting portion R2 in which a linear groove h2 extending in the up-down direction is disposed as a pair of left-right partition elements capable of visually separating the boundary portion with the horizontal band portion 121. The first connecting portion R1 and the second connecting portion R2 are disposed alternately in the up-down direction and the left-right direction in each of the vertical band portions 11, 12 and each of the horizontal band portions 12.

[0078] Therefore, with this embodiment, it is possible to provide a chair equipped with a backrest E that can satisfactorily achieve an appearance of woven vertical and horizontal bands while ensuring the rigidity of the backrest E.

[0079] In other words, since the backrest main body F is integrally formed from synthetic resin, it has excellent design freedom that can ensure the rigidity of the backrest E.

[0080] In addition, the first connecting portion, which also serves as the vertical band portion 11 and the horizontal band portion 12, has a groove h1 that visually separates the boundary portion with the vertical band portion 111, and the second connecting portion, which also serves as the vertical band portion 11 and the horizontal band portion 12, has a groove h2 that visually separates the boundary portion with the horizontal band portion 121. Therefore, it is possible to provide the user with a backrest E that has a suitable appearance, as if the horizontal bands and vertical bands were woven, without excessively impairing the rigidity of the backrest main body F.

[0081] Furthermore, since the upper and lower partition elements are grooves h1 extending in the left-right direction, and the left and right partition elements are grooves h2 extending in the up-down direction, it is possible to preferably provide a partition line that is easily visible on the outer surface of the backrest main body F.

[0082] Each of the vertical belt portion 111, the horizontal belt portion 121, and the first and second connecting portions R1 and R2 is provided with a backrest surface m facing forward, and each of these backrest surfaces m is set at a position that coincides with a virtual backrest surface S that is approximately flush with the surface.

[0083] This allows the backrest base 1 to have a suitable design and also provides the user with a smooth backrest surface m that is unlikely to give the impression of unevenness.

[0084] The backrest main body F comprises left and right side frame parts 2, an upper frame part 3 connecting the upper parts of the left and right side frame parts 2, a lower frame part 4 connecting the lower parts of the left and right side frame parts 2, and an intermediate connecting part 5 connecting the left and right side frame parts 2 with a cavity kd formed between the lower frame part 4. The peripheral part of the backrest base 1 is connected to the left and right side frame parts 2, the upper frame part 3, and the intermediate connecting part 5.

[0085] As a result, a backrest main body F having a suitable structure for supporting the peripheral portion of the backrest base 1 is realized.

[0086] The side edges of the horizontal belt portion 121 are connected to the left and right side frame portions 2, the upper edge of the vertical belt portion 111 is connected to the upper frame portion 3, and the lower edge of the vertical belt portion 111 is connected to the intermediate connecting portion 5. As a result, the upper and lower exposed edges of the horizontal belt portion 121 can be provided near the left and right side frame portions 2, and the left and right exposed edges of the vertical belt portion 111 can be provided near the upper frame portion 3 and the intermediate connecting portion 5, making it possible to form a backrest base 1 with excellent design.

[0087] A step h3 serving as a side partition element that can visually separate the left and right side frame portions 2 and the horizontal band portion 121 is provided at the boundary between the left and right side frame portions 2 and the horizontal band portion 121. A step h4 serving as an upper partition element that can visually separate the upper frame portion 3 and the vertical band portion 111 is provided at the boundary between the upper frame portion 3 and the vertical band portion 111. In addition, a groove h5 serving as a lower partition element that can visually separate the intermediate connector portion 5 and the vertical band portion 111 is provided at the boundary between the intermediate connector portion 5 and the vertical band portion 111.

[0088] As a result, the left and right side frame portions 2, the upper frame portion 3, and the intermediate connecting portion 5 can be visually separated from the backrest base 1 by the steps h3, h4 and the groove h5, which contributes to the creation of a neat and desirable external appearance.

[0089] The side partition element is a step h3 extending in the vertical direction, the upper partition element is a step h4 extending in the left-right direction, and the lower partition element is a groove h5 extending in the left-right direction, so that suitable partition elements are provided depending on the location.

[0090] The backrest base 1 has vertical bands 11 arranged at six positions at regular intervals in the left-right direction, and horizontal bands 12 arranged at eight positions at regular intervals in the up-down direction. Therefore, the relatively wide vertical bands 11 and horizontal bands 12 form the backrest base 1 that is easily visible to the user.

[0091] The seat C is placed on the support base B, and the backrest E is supported by the support base B via the back support member D. This gives the chair excellent freedom in designing the shape of the backrest body F.

[0092] It should be noted that the present invention is not limited to the embodiment described above in detail.

[0093] Of course, the backrest may be of a type in which no back cover is attached to the backrest body.

[0094] It goes without saying that the widths of the vertical band portions and the horizontal band portions and the number of the portions arranged in parallel can be freely set without departing from the spirit of the present invention.

[0096] The backrest surfaces of the vertical band portions, the horizontal band portions, and the first and second connecting portions do not have to be set at positions that coincide with an imaginary backrest surface that is substantially flush with one another.

[0097] The backrest base may be supported in any manner.

[0099] Furthermore, the specific configuration of each part is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0100] E…Backrest F…Backrest body 1...Backrest base m…backrest surface 11...Vertical band section 12...Horizontal band section 111…Horizontal belt 121…Vertical belt section R1…First connecting part (connecting part) R2: Second connecting part (connecting part) h1... Groove (upper and lower partition element) h2...Groove (left and right partition element)

Claims

1. A chair with a backrest having a backrest main body integrally formed from a synthetic resin, the backrest main body having a backrest surface and a plurality of vertical band parts extending in the up-down direction arranged at regular intervals in the left-right direction, and a plurality of horizontal band parts having a backrest surface and extending in the left-right direction arranged at regular intervals in the up-down direction, the backrest base having a lattice-like appearance formed by the vertical band parts and the horizontal band parts, The vertical band portion is formed by vertical band portions having exposed left and right end edges and connecting portions adjacent to the vertical band portions, the connecting portions being arranged alternately in the up-down direction, The horizontal band portion is formed by horizontal band portions having both upper and lower end edges exposed and connecting portions adjacent to the horizontal band portions being arranged alternately in the left-right direction, The connecting portion has a substantially rectangular shape and serves as a configuration of both the vertical band portion and the horizontal band portion, The plurality of connecting portions are configured by a first connecting portion in which a pair of upper and lower partition elements capable of visually separating a boundary portion with the vertical band portion are arranged, and a second connecting portion in which a pair of left and right partition elements capable of visually separating a boundary portion with the horizontal band portion are arranged, the first connecting portion and the second connecting portion are arranged alternately in the up-down direction and the left-right direction in each vertical band portion and each horizontal band portion, A chair in which the upper and lower partition elements are grooves extending in the left-right direction, and the left and right partition elements are grooves extending in the up-down direction.

2. A chair with a backrest having a backrest main body integrally formed from a synthetic resin, the backrest main body having a backrest surface and a plurality of vertical band parts extending in the up-down direction arranged at regular intervals in the left-right direction, and a plurality of horizontal band parts having a backrest surface and extending in the left-right direction arranged at regular intervals in the up-down direction, the backrest base having a lattice-like appearance formed by the vertical band parts and the horizontal band parts, The vertical band portion is formed by vertical band portions having exposed left and right end edges and connecting portions adjacent to the vertical band portions, the connecting portions being arranged alternately in the up-down direction, The horizontal band portion is formed by horizontal band portions having both upper and lower end edges exposed and connecting portions adjacent to the horizontal band portions being arranged alternately in the left-right direction, The connecting portion has a substantially rectangular shape and serves as a configuration of both the vertical band portion and the horizontal band portion, The plurality of connecting portions are configured by a first connecting portion in which a pair of upper and lower partition elements capable of visually separating a boundary portion with the vertical band portion are arranged, and a second connecting portion in which a pair of left and right partition elements capable of visually separating a boundary portion with the horizontal band portion are arranged, the first connecting portion and the second connecting portion are arranged alternately in the up-down direction and the left-right direction in each vertical band portion and each horizontal band portion, The backrest body includes left and right side frame portions, an upper frame portion connecting the upper portions of the left and right side frame portions, a lower frame portion connecting the lower portions of the side frame portions, and an intermediate connecting portion connecting the left and right side frame portions with a cavity formed between the lower frame portions, The peripheral portion of the backrest base is connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion; The side edges of the horizontal band portion are connected to the left and right side frame portions, An upper end edge of the vertical band portion is connected to the upper frame portion, A lower end edge of the vertical belt portion is connected to the intermediate connecting portion, A side partition element capable of visually separating the left and right side frame portions from the horizontal band portion is provided at a boundary between the left and right side frame portions and the horizontal band portion, An upper partition element capable of visually separating the upper frame portion and the vertical band portion is provided at a boundary between the upper frame portion and the vertical band portion, a lower partition element is provided at a boundary between the intermediate connecting portion and the vertical band portion to visually separate the intermediate connecting portion and the vertical band portion; The side partition element is a step or groove extending in the vertical direction, The upper partition element is a step or groove extending in the left-right direction, A chair in which the lower partition element is a step or groove extending in the left-right direction.

3. A chair as described in claim 1 or 2, wherein each of the vertical belt portion, the horizontal belt portion, and the first and second connecting portions is provided with a backrest surface facing forward, and each of these backrest surfaces is set at a position that coincides with a virtual backrest surface that is approximately flush with the surface.

4. The backrest body includes left and right side frame portions, an upper frame portion connecting the upper portions of the left and right side frame portions, a lower frame portion connecting the lower portions of the side frame portions, and an intermediate connecting portion connecting the left and right side frame portions with a cavity formed between the lower frame portions, 2. The chair according to claim 1, wherein the peripheral edge of the backrest base is connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion.

5. The side edges of the horizontal band portion are connected to the left and right side frame portions, An upper end edge of the vertical band portion is connected to the upper frame portion, 5. The chair according to claim 4, wherein the lower end edge of the vertical belt portion is connected to the intermediate connecting portion.

6. A side partition element capable of visually separating the left and right side frame portions from the horizontal band portion is provided at a boundary between the left and right side frame portions and the horizontal band portion, An upper partition element capable of visually separating the upper frame portion and the vertical band portion is provided at a boundary between the upper frame portion and the vertical band portion, 6. The chair according to claim 5, further comprising a lower partition element at a boundary between the intermediate connector and the vertical belt, the lower partition element being capable of visually separating the intermediate connector from the vertical belt.

7. The side partition element is a step or groove extending in the vertical direction, The upper partition element is a step or groove extending in the left-right direction, 7. The chair according to claim 6, wherein the lower partition element is a step or groove extending in the left-right direction.

8. A chair as described in claims 1, 2, 3, 4, 5, 6 or 7, wherein the backrest base has the vertical band portions arranged at six locations at regular intervals in the left-right direction and the horizontal band portions arranged at eight locations at regular intervals in the up-down direction.

9. 9. The chair according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the seat is disposed on a support base and the backrest is supported by the support base via a back support member.

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