JP7620463B2 - chair - Google Patents

Description

The present invention relates to a chair.

Chairs have been known in the past in which a downward-facing, bag-shaped back cover is attached to the backrest body (back frame) (see, for example, Patent Document 1).

Some of these types of back covers have an opening at the bottom end for attaching to the backrest body. As shown in Patent Document 1, in conventional back covers, the opening is generally closed with an opening closing means (connecting means) such as a zipper or hook after the backrest body is stored inside.

However, with this type of configuration, the excess ends that are generated when fasteners, hooks, etc. are provided tend to get in the way, and special measures are often required to conceal the excess ends from the outside in an attractive way.

Moreover, when attaching the back cover to the backrest body, the task of connecting the zippers and hooks that are spaced apart from each other can be time-consuming, and it cannot necessarily be said that the installation work can be done quickly.

JP 2013-059405 A

The present invention was made in light of the above circumstances, and aims to provide a chair that has at least a structure that allows the back cover to be conveniently attached to the backrest body.

That is, the present invention has the following configuration.

The invention described in claim 1 is a chair equipped with a backrest having a backrest body and a back cover that covers the backrest body, the back cover comprising a cover body in the shape of a downward-facing bag with an opening at the lower end into which the backrest body is inserted, and a front engagement member and a rear engagement member attached to the front and rear inner surfaces of the cover body near the opening, the front engagement member having a first engagement portion that protrudes rearward and can engage with the lower edge of the part that constitutes the backrest body, and the rear engagement member having a second engagement portion that protrudes forward and can engage with the lower edge of the part that constitutes the backrest body. the first engagement portion and the second engagement portion are arranged at positions where they do not interfere with each other , the front engagement member comprises a front engagement member main body shaped like an upright plate, a plurality of the first engagement portions protruding from the front engagement member main body, and a first sewn portion which is located below the first engagement portions on the front engagement member main body and sewn to the cover main body, and the rear engagement member comprises a rear engagement member main body shaped like an upright plate, a plurality of the second engagement portions protruding from the rear engagement member main body, and a second sewn portion which is located below the second engagement portions on the rear engagement member main body and sewn to the cover main body .

The invention described in claim 2 is a chair equipped with a backrest having a backrest body and a back cover that covers the backrest body, the back cover comprising a cover body in the shape of a downward-facing bag with an opening at the lower end into which the backrest body is inserted, and a front engagement member and a rear engagement member attached to the front and rear inner surfaces of the cover body near the opening, the front engagement member having a first engagement portion that protrudes rearward and can engage with the lower edge of a portion that constitutes the backrest body, the rear engagement member having a first engagement portion that protrudes forward and engages with the lower edge of the portion that constitutes the backrest body, a second engagement portion that can engage with the edge of the backrest, the first engagement portion and the second engagement portion being arranged in a position where they do not interfere with each other, the backrest main body comprising 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, an intermediate connecting portion connecting the left and right side frame portions while forming a cavity between the lower frame portions, and a backrest base having a backrest surface and whose peripheral portion is connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion, and the part that constitutes the backrest main body is the intermediate connecting portion .

The invention described in claim 3 is a chair as described in claim 1, wherein the first engagement portion is hook-shaped and includes a first lower engagement portion extending rearward from the front engagement member main body and a rear engagement portion erected from the extended end of the first lower engagement portion, and the second engagement portion is hook-shaped and includes a second lower engagement portion extending forward from the rear engagement member main body and a front engagement portion erected from the extended end of the second lower engagement portion.

The invention described in claim 4 is the chair described in claim 3, in which the front engagement member body is formed with a first interference avoidance hole for avoiding interference with the front engagement portion, and the rear engagement member body is formed with a second interference avoidance hole for avoiding interference with the rear engagement portion.

The invention described in claim 5 is a chair described in claim 1, 3 or 4, wherein a first positioning protrusion is protruded from the front engagement member main body, capable of engaging with a first through hole formed in the backrest main body, and a second positioning protrusion is protruded from the rear engagement member main body, capable of engaging with a second through hole formed in a position different from the first through hole in the backrest main body .

The invention described in claim 6 is a chair described in claims 1, 2, 3, 4, or 5, in which the front engagement member and the rear engagement member are made of synthetic resin.

The invention described in claim 7 is the chair described in claim 1, 2, 3, 4, 5 or 6, in which the cover body is mainly made of an elastic material.

As explained above, the present invention aims to provide a chair that has at least a structure that allows the back cover to be conveniently attached to the backrest body.

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. FIG. FIG. FIG. FIG. FIG. 4 is an end view of line XX in FIG. 3. FIG. 9 is an enlarged view of a portion Z in FIG. 8 . 4 is an end view taken along line YY in FIG. 3. FIG. 11 is an enlarged view of a portion W in FIG. FIG. FIG. 1 is a perspective view of the embodiment (with the back cover attached); FIG. FIG. FIG. 4 is a perspective view of the front engagement member in the embodiment as viewed from the rear side. FIG. 4 is a front perspective view of a rear engagement member in the embodiment; FIG. FIG. FIG. 13 is an explanatory diagram illustrating a mounting manner between the front engagement member and the cover main body (front cover portion) in the embodiment, as viewed from the rear. 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.

One embodiment of the present invention will be described below with reference to Figures 1 to 21.

In this embodiment, the present invention is applied to a swivel chair (hereafter simply referred to as "chair") suitable for use in an office or similar setting.

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 backwards with respect to the support base B via a back support D.

The backrest E has a backrest body F that is 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.

<<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.

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-shaped part W with a cavity kd formed inside by the left and right side frame parts 2, the lower frame part 4, and the intermediate connecting part 5.

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

<Upper frame portion 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.

<Lower frame portion 4>
The lower frame portion 4 constitutes 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 of the back support body D.

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 edge side of the back support D, and a bottom wall portion 414 extending forward from the lower 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 recess portion 415 for accommodating the head of the screw is provided on the back side of the rear wall portion 413, and the recess portion 415 is adapted to be closed by a concealing cap P.

<Intermediate connecting portion 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 a 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 a 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.

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

The backrest base 1 is made up of multiple vertical bands 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 bands 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 bands 11 and horizontal bands 12 form a lattice-like appearance.

The vertical band portion 11 is composed of 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. Adjacent through holes that penetrate in the front-to-rear direction are provided on the left and right sides of the vertical band portions 111.

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 approximately the same width.

Of the multiple vertical belts 111, the upper edge of the uppermost vertical belt 111 is connected to the lower edge of the upper frame 3. At the boundary between the upper frame 3 and the vertical belts 111, a step h4 is provided that extends in the left-right direction and serves as an upper partition element that visually separates the upper frame 3 from the vertical belts 111.

The lower edge of the vertical belt portion 111 located at the bottom of the multiple vertical belt portions 111 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 visually separates the intermediate connecting portion 5 from the vertical belt portions 111.

The horizontal band portion 12 is composed of horizontal band portions 121 with exposed upper and lower end edges 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-to-rear direction.

The outer edge of the horizontal band 121 located on the outermost side of the multiple horizontal bands 121 is connected to the inner edges of the left and right side frame parts 2. At the boundaries between the left and right side frame parts 2 and the horizontal bands 121, there are steps h3 extending in the vertical direction that serve as side partition elements that visually separate the left and right side frame parts 2 and the horizontal bands 121.

Next, we will provide a detailed description of the connecting parts (first connecting part R1 and second connecting part R2) that can form both the vertical band part 11 and the horizontal band part 12 in the backrest base part 1.

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

The first connecting portion R1 and the second connecting portion R2 are arranged alternately in the up-down and left-right directions in each vertical band portion 11 and each horizontal band portion 12 via the vertical band portion 111 or the horizontal band portion 121.

More specifically, the vertical bands 11 in the left-right center (fourth from the left and right) are arranged alternately in the following order from the upper frame 3 side toward the intermediate connecting portion 5 side: vertical band 111, first connecting portion R1, vertical band 111, second connecting portion R2, vertical band 111, first connecting portion R1, vertical band 111, second connecting portion R2, vertical band 111, first connecting portion R1, vertical band 111, second connecting portion R2, vertical band 111, first connecting portion R1, vertical band 111, second connecting portion R2, vertical band 111, first connecting portion R1, vertical band 111, second connecting portion R2, vertical band 111, first connecting portion R1, vertical band 111, first connecting portion R1, vertical band 111.

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 arranged alternately in the following order from the upper frame portion 3 side toward 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.

More specifically, the horizontal band portions 12 in the vertical center (fifth from the top and bottom) are arranged alternately in the following order from the left side frame portion 2 side to the right side frame portion 2 side in a front view: 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.

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 in a front view: 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.

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 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 approximately flush. Note that the position of the imaginary backrest line S shown in Figures 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 approximately flush, except for the grooves h1 and h2 formed in the first and second connecting portions R1 and R2.

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

Next, we will provide a detailed description of the back cover G that is attached to the backrest body F.

<<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.

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

<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 composed 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 have their left and right side edges and their upper edges sewn together or integrally connected together so that an opening K is formed only at the lower end part.

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

[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 in 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.

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

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

The lower end of the front cover part 61 covers the lower edge of the front engagement member main body 71 from the front side, with the end portion st located on the rear side of the lower part of the front engagement 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.

[First engagement portion 72]
The first engagement portion 72 is flexible enough to be engaged with a portion constituting the backrest body F, i.e., the lower edge of the intermediate connecting portion 5, which protrudes 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 erected from the extended end of the first lower engagement portion 721.

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

The first engagement portion 72 of the front engagement member 7 and the second engagement portion 82 of the rear engagement member 8 are positioned so as not to interfere with each other.

[First positioning protrusion 73]
The first positioning protrusion 73 can engage with the 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 protrusion 73 is disposed at two locations, left and right, on the front engagement member body 71.

The first positioning protrusion 73 has an upward U-shape. More specifically, the first positioning protrusion 73 has left and right standing walls 731 and a connecting wall 732 that connects 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 edge of a first through hole k1 formed at a corresponding position, thereby positioning the front engagement member 7 with respect to the backrest body F.

The first through hole k1 is composed of an intermediate connecting portion 5, left and right vertical band portions 111 whose lower ends are connected to the intermediate connecting portion 5, and a horizontal band portion 121.

The first positioning protrusion 73 on the front engagement member 7 and the second positioning protrusion 83 on the rear engagement member 8 are positioned so as not to interfere with each other.

<Rear Engagement 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.

[Rear engagement member body 81]
The rear engaging member body 81 is in the form of a flexible plate that is in an upright position 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.

The rear engagement member main body 81 is formed with a second interference avoidance hole 811 having a horizontally elongated rectangular shape to avoid interference with the rear engagement portion 722 of the first engagement portion 72 of the front engagement member 7. The second interference avoidance hole 811 is provided in three locations: the center and the left and right. The second interference avoidance hole 811 is formed between two second engagement portions 82 arranged side by side at a fixed interval in the left-right direction, and on the outside of each of the two second engagement portions 82.

A second sewn portion 812 that is sewn to the cover body 6 is provided at the bottom 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.

The lower end of the rear cover part 62 covers the lower edge of the rear engagement member main body 81 from the rear side, with the end portion st located on the front side of the lower part of the rear engagement 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.

[Second engagement portion 82]
The second engaging portion 82 is flexible enough to be engaged with a 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.

The second engagement portion 82 cooperates with the rear engagement member body 81 to hold the lower end of the intermediate connecting portion 5 from below.

The second engagement portion 82 of the rear engagement member 8 and the first engagement portion 72 of the front engagement member 7 are positioned so as not to interfere with each other.

[Second positioning protrusion 83]
The second positioning protrusions 83 can engage with the opening edges of rectangular second through holes k2 penetrating in the front-rear direction and formed on the intermediate connecting portion 5 of the backrest 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 body 81, and at the left and right end portions of the rear engaging member body 81, respectively.

The second positioning protrusion 83 has an upward U-shape. More specifically, the second positioning protrusion 83 has left and right standing walls 831 and a connecting wall 832 that connects 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.

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.

The second positioning protrusion 83 on the rear engagement member 8 and the first positioning protrusion 73 on the front engagement member 7 are positioned so that they do not interfere with each other.

The chair described above has a backrest surface m, and the first and second connecting parts R1, R2, which are partition elements with grooves h1, h2 that are different in position and extension direction, are arranged alternately in the up-down and left-right directions in each vertical band part 11 and each horizontal band part 12, so that it is possible to provide a chair with a backrest body F that can ideally achieve the appearance of woven vertical and horizontal bands.

Furthermore, with the above-mentioned chair, it is possible to provide a chair having a configuration that allows the back cover G to be conveniently attached to the backrest body F.

As described above, the chair according to this embodiment is equipped with a backrest E having a backrest body F and a back cover G that covers the backrest body F. The back cover G is equipped with a cover body 6 that is in the shape of a downward-facing bag and has an opening K at the lower end into which the backrest body F is inserted, and a front engagement member 7 and a rear engagement member 8 that are attached to the front and rear inner surfaces of the cover body 6 near the opening K. The front engagement member 7 is equipped with a first engagement portion 72 that can be engaged with the lower edge of the intermediate connection portion 5 that is a part that protrudes rearward and constitutes the backrest body F, and the rear engagement member 8 is equipped with a second engagement portion 82 that can be engaged with the lower edge of the intermediate connection portion 5 that is a part that protrudes forward and constitutes the backrest body F, and the first engagement portion 72 and the second engagement portion 82 are arranged in positions where they do not interfere with each other.

Therefore, this embodiment can provide a chair that has a configuration that allows the back cover G to be conveniently attached to the backrest body F.

In other words, by engaging the front engagement member 7 and the rear engagement member 8 with the intermediate connection portion 5 of the backrest body F, the back cover G can be attached appropriately.

In addition, the first engagement portion 72 of the front engagement member 7 and the second engagement member 82 of the rear engagement member 8 are positioned so that they do not interfere with each other, allowing the back cover G to be smoothly attached to the backrest body F.

The front engaging member 7 comprises a front engaging member main body 71 in the form of an upright plate, a plurality of first engaging portions 72 protruding from the front engaging member main body 71, and a first sewn portion 712 that is disposed below the first engaging portions 72 on the front engaging member main body 71 and sewn to the cover main body 6, while the rear engaging member 8 comprises a rear engaging member main body 81 in the form of an upright plate, a plurality of second engaging portions 82 protruding from the rear engaging member main body 81, and a second sewn portion 812 that is disposed below the second engaging portions 82 on the rear engaging member main body 81 and sewn to the cover main body 6.

As a result, the opening K is left open downwards without having to be closed by a fastener, hook or other opening closing means as in the past, and the cover body 6 can be properly attached to the backrest body F while maintaining a favorable appearance of the lower end of the cover body 6.

In other words, the lower edge of the cover body 6 is sewn to the sewn portion 712 of the front engaging member body 71, which is located below the first engaging portion 72, and is sewn to the sewn portion 812 of the rear engaging member body 81, which is located below the second engaging portion 82.

As a result, the appearance of the lower edges of the front cover part 61 and the rear cover part 62 of the cover body 6 can be appropriately adjusted based on the shape of the lower ends of the plate-shaped front engagement member body 71 and rear engagement member body 81.

The first engagement part 72 is hook-shaped and includes a first lower engagement part 721 extending rearward from the front engagement member main body 71 and a rear engagement part 722 erected from the extended end of the first lower engagement part 721, and the second engagement part 82 is hook-shaped and includes a second lower engagement part 821 extending forward from the rear engagement member main body 81 and a front engagement part 822 erected from the extended end of the second lower engagement part 821.

For this reason, the first engagement portion 72 and the second engagement portion 82 are adapted to suitably engage with the lower edge of the intermediate connection portion 5 of the backrest body F.

The front engagement member body 71 is formed with a first interference avoidance hole 711 to avoid interference with the front engagement portion 822 of the rear engagement member 8, and the rear engagement member body 81 is formed with a second interference avoidance hole 811 to avoid interference with the rear engagement portion 722 of the front engagement member 7.

This allows for a suitable configuration in which the rear engagement portion 722 of the first engagement portion 72 of the front engagement member 7 and the front engagement portion 822 of the second engagement member 82 of the rear engagement member 8 do not interfere with each other.

Moreover, because the interference avoidance is achieved by holes rather than notches, it is possible to provide a front engagement member main body 71 and a rear engagement member main body 81 that are plate-shaped and have excellent rigidity and are resistant to cracking even when bent while still having a certain degree of flexibility.

The front engaging member body 71 has a first positioning protrusion 73 that can engage with a first through hole k1 formed in the backrest body F, and the rear engaging member body 81 has a second positioning protrusion 83 that can engage with a second through hole k2 formed in a position different from the first through hole k1 in the backrest body F.

Therefore, the first through hole k1 and the second through hole k2, which are through holes formed in the backrest body F, can be used to appropriately position the front engagement member 7 and the rear engagement member 8 relative to the backrest body F. Therefore, the back cover G can be set at an appropriate position relative to the backrest body F.

The front engagement member 7 and the rear engagement member 8 are made of synthetic resin. This allows the front engagement member 7 and the rear engagement member 8 to be easily deformed when engaging and disengaging with the backrest body F.

The backrest 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, an intermediate connecting part 5 connecting the left and right side frame parts 2 while forming a cavity kd between the lower frame part 4, and a backrest base part 1 having a backrest surface m and whose peripheral part is connected to the left and right side frame parts 2, the upper frame part 3, and the intermediate connecting part 5. The part that constitutes the backrest body F is the intermediate connecting part 5 that is connected below the backrest base part 1.

This allows the backrest base 1 to be appropriately covered, while leaving the lower portions of the left and right side frame parts 2 and the lower frame part 4, which are located below the backrest base 1, exposed and not covered by the cover body 6, resulting in an appearance with excellent design.

The cover body 6 is mainly made of a stretchable material. Therefore, the stretchability of the cover body 6 can be used to suitably engage the front engagement member 7 and the rear engagement member 8 with the backrest body F.

The present invention is not limited to the embodiments described above.

The cover body needs only to be in the shape of a downward-facing bag with an opening at the bottom end through which the backrest body can be inserted, and the materials constituting the cover body can be freely selected and combined.

The front and rear engagement members may be attached to the cover body by a method other than sewing.

The area where the first engagement portion of the front engagement member and the second engagement portion of the rear engagement member can engage may be any part that constitutes the backrest body.

The first and second through holes with which the first and second positioning protrusions can engage may be any holes formed in the backrest body, and needless to say, are not limited to those shown in the above-mentioned embodiment.

The front and rear engagement members do not have to be made of synthetic resin, but may be made of metal or paper, for example.

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.

E: backrest F: backrest body G: back cover K: opening 6: cover body 7: front engagement member 8: rear engagement member 5: intermediate connection portion (part constituting the backrest body)
72...First engaging part 82...Second engaging part

Claims (7)

A chair comprising a backrest having a backrest body and a back cover for covering the backrest body,
The back cover includes a cover body having a downward-facing bag shape with an opening at a lower end into which the backrest body is inserted, and a front engagement member and a rear engagement member attached to the front and rear inner surfaces of the cover body near the opening,
The front engagement member has a first engagement portion that is protruded rearward and can engage with a lower edge of a portion that constitutes the backrest body,
The rear engagement member is provided with a second engagement portion that is protruded forward and can engage with a lower edge of a portion that constitutes the backrest body,
the first engaging portion and the second engaging portion are disposed at positions where they do not interfere with each other ,
the front engaging member includes a front engaging member main body having a standing plate shape, a plurality of the first engaging portions protruding from the front engaging member main body, and a first sewn portion that is provided below the first engaging portions on the front engaging member main body and sewn to the cover main body,
A chair in which the rear engaging member comprises a rear engaging member main body shaped like an upright plate, a plurality of the second engaging portions protruding from the rear engaging member main body, and a second sewn portion that is located below the second engaging portions on the rear engaging member main body and sewn to the cover main body . A chair comprising a backrest having a backrest body and a back cover for covering the backrest body,
The back cover includes a cover body having a downward-facing bag shape with an opening at a lower end into which the backrest body is inserted, and a front engagement member and a rear engagement member attached to the front and rear inner surfaces of the cover body near the opening,
The front engagement member has a first engagement portion that is protruded rearward and can engage with a lower edge of a portion that constitutes the backrest body,
The rear engagement member is provided with a second engagement portion that is protruded forward and can engage with a lower edge of a portion that constitutes the backrest body,
the first engaging portion and the second engaging portion are disposed at positions where they do not interfere with each other ,
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, 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, and a backrest base portion having a backrest surface and a peripheral portion connected to the left and right side frame portions, the upper frame portion, and the intermediate connecting portion;
A chair in which the part constituting the backrest main body is the intermediate connecting part . The first engagement portion is a hook-shaped portion including a first lower engagement portion extending rearward from the front engagement member main body and a rear engagement portion erected from an extended end portion of the first lower engagement portion,
2. The chair according to claim 1, wherein the second engagement portion is hook-shaped and comprises a second lower engagement portion extending forward from the rear engagement member main body and a front engagement portion erected from the extended end of the second lower engagement portion. a first interference avoidance hole for avoiding interference with the front engagement portion is formed in the front engagement member main body,
4. The chair according to claim 3, wherein the rear engagement member body is formed with a second interference avoidance hole for avoiding interference with the rear engagement portion. A first positioning protrusion that can be engaged with a first through hole formed in the backrest body is provided on the front engagement member body,
A chair as described in claim 1 , 3 or 4, wherein the rear engagement member main body has a second positioning protrusion protruding therefrom that can engage with a second through hole formed at a position different from the first through hole in the backrest main body. A chair according to claim 1, 2, 3, 4 or 5, in which the front and rear engagement members are made of synthetic resin. 7. The chair according to claim 1, 2, 3, 4, 5 or 6, wherein the cover body is mainly made of an elastic material.

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