chair

Abstract

To provide a chair capable of preventing the seat surface and backrest from getting dirty and maintaining a clean state even when installed outdoors. [Solution] The chair according to the present invention comprises a seat plate having a seat surface and extending in a first direction, first and second side walls provided at both ends of the seat plate in the first direction and having a plate-like shape, and a cover that covers the seat surface and can be opened and closed by moving back and forth. Each of the first and second side walls extends in a second direction intersecting with the first direction and has an edge surface that is curved in the extension direction, and the cover is supported by the edge surfaces of the first and second side walls and is configured to be slidable. Each slat constituting the cover is engaged with each other by a curved portion in a second direction perpendicular to the first direction, but the structure is such that water ingress is prevented by reversing the direction of the curve. Also, the edge surfaces of the first and second side walls have grooves to drain rainwater that falls on both ends of the cover.

Description

[Technical field]

[0001] The present invention relates to a chair, and more particularly to a chair for outdoor use. [Background technology]

[0002] There are many benches installed outdoors in parks, public facilities, large private facilities, etc. When the seat of an outdoor bench is dirty or wet after rain, it is impossible to sit on it as it is. Patent Document 1 describes a bench in which the upper seat board is attached so that it can be freely raised and lowered, with its rear end as the center of rotation, between a laid-down position in which it covers the top surface of the lower seat board, and an upright position in which it rests against the front of the backrest.This means that even if the seat of the bench is wet after it has rained, a dry seat can be presented where the seat is located by simply changing the position of the upper seat board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-250654 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the chair described in Patent Document 1, simply lifting the upper seat board is not sufficient for sitting on, as rain and dust can get in through the gap between the upper and lower seat boards due to the wind. In addition, when sitting down, the upper seat board is lifted onto the back of the bench, but the upper seat board gets in the way and the back of the upper seat board is not clean enough. Generally, chairs and benches (long benches) installed outdoors are not provided with covers, and the seat and back become dirty due to exposure to wind and rain. For this reason, when using the chair, paper or cloth may be laid or covered on the chair before sitting, which is time-consuming. In addition, the chair itself may deteriorate and be damaged due to being exposed to wind and rain for a long time. What is needed is a chair that can prevent the seat and back from getting dirty and can be kept sufficiently clean even when placed outdoors. [Means for solving the problem]

[0005] The chair according to the present invention comprises a seat plate having a seat surface and extending in a first direction, first and second side wall portions each having a plate-like shape and provided at both ends of the seat plate in the first direction, and a cover that covers the seat surface and can be opened and closed by moving back and forth. Each of the first and second side wall portions extends in a second direction intersecting the first direction and has an edge surface having a shape curved in the extension direction, and the cover is slidably supported on the edge surfaces of the first and second side wall portions. In the chair according to the present invention, the seat is covered with a cover that can be opened and closed to prevent the seat from becoming dirty or deteriorating. The cover is supported slidably on the edge surfaces of the first and second side walls provided at both ends of the seat, so that the cover can be opened and closed smoothly along the edge surfaces. Furthermore, when the cover is closed, the seat, as well as the back panel or the inner surfaces of the first and second side walls, can be prevented from being exposed to the elements, and can be kept clean.

[0006] The chair according to the present invention may further include first and second guide rails joined and fixed to the first and second side wall portions, respectively, and having a substantially L-shape. The ceiling portions of the first and second guide rails cover a part of the edge surfaces of the first and second side wall portions, respectively, and gaps for guiding the cover may be formed between the edge surface of the first side wall portion and the first guide rail, and between the edge surface of the second side wall portion and the second guide rail. In the chair of the present invention, a cover is placed in the gap formed between the edge surface of the first side wall portion and the first guide rail, and between the edge surface of the second side wall portion and the second guide rail, and the cover is guided between these gaps, allowing the cover to move smoothly.

[0007] In addition, in the chair of the present invention, the cover includes a first slat and a second slat extending in the first direction and connected to each other in the second direction, the first slat having a first curved portion curved in the extension direction at one end side in the second direction and a second curved portion curved in the extension direction at the other end side in the second direction, the second slat having a third curved portion curved in the extension direction at one end side in the second direction and a fourth curved portion curved in the extension direction at the other end side in the second direction, the second curved portion being curved in the opposite direction to the curvature direction of the first curved portion, and the fourth curved portion being curved in the opposite direction to the curvature direction of the third curved portion, and the second slat may be connected to the first slat by hanging down so as to cover along the outer edge side of the second curved portion of the first slat at a fitting portion where the first slat and the second slat are fitted together. In the chair of the present invention, the second curved portion is curved toward the inside of the chair, so that the joint portion avoids a position where it is subjected to the flow of rainwater, and the rainwater jumps over the connection portion, thereby preventing water from entering through the connection portion.

[0008] In addition, in the chair of the present invention, the first slat may have a bottom protrusion having a curved surface on the bottom side of the end in the first direction, and an end protrusion having a convex shape on the side side of the end of the first slat, and when the cover is opened or closed, the bottom protrusion of the first slat abuts against the edge surface of the first side wall portion or the second side wall portion, and the end protrusion abuts against the inner wall surface of the first guide rail or the second guide rail and is guided thereby to move the cover. In the chair according to the present invention, the bottom projections support the weight of each slat and reduce friction when the cover is opened or closed, while the end projections prevent the slats from shifting horizontally when the cover is opened or closed and reduce friction when the cover is opened or closed.

[0009] In addition, the chair of the present invention may be characterized in that an edge surface of the first side wall portion or the second side wall portion has a groove portion for draining rainwater from the cover, and the bottom surface of the groove portion is inclined from the top to the bottom of the chair. Rainwater flowing in from both ends of the slats can be dropped into grooves provided on the edge surface of the first side wall or the second side wall and discharged to the outside, thereby preventing rainwater from flowing into the inside of the chair.

[0010] In addition, in the chair of the present invention, the cover is formed by connecting a plurality of slats, each of the plurality of slats has a curved portion curved in the extension direction at both ends in the second direction, the curved portions are connected to each other by fitting together, the plurality of slats include a top slat arranged to be located near the top of the cover when the cover is closed, and the curved portions provided on both ends in the second direction of the top slat may be curved in the same downward direction. Since the curved portions on both ends of the top slat are curved in the same downward direction, rainwater flows over the joints at both the front and rear, making it easier to prevent water seepage. Effect of the Invention

[0011] In the chair according to the present invention, the seat surface is covered with a cover that is openable and closable, thereby preventing the seat surface from becoming dirty or deteriorating. In addition, the cover is slidably supported on the edge surfaces of the first and second side walls provided at both ends of the seat plate, so that the cover can be opened and closed smoothly along the edge surfaces. Furthermore, when the cover is closed, the seat surface, as well as the back plate or the inner surfaces of the first and second side walls, can be prevented from being exposed to the elements, so that the entire interior of the chair that the person sitting in contact with can be kept clean. In particular, even when the chair is installed outdoors, the seat surface and backrest can be prevented from getting wet or dirty, so that a chair that is always clean can be provided. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic perspective view of a chair according to this embodiment, as viewed from the front side. [Diagram 2] FIG. 2 is a schematic perspective view of the chair according to this embodiment as viewed from the rear side. [Diagram 3] Fig. 3(a) is a schematic diagram of the chair according to this embodiment as viewed from the right side, and Fig. 3(b) is an enlarged view of part A at the lower end of the storage section in Fig. 3(a). [Figure 4] Fig. 4(a) is a diagram showing the internal structure of the right side of the chair according to the present embodiment. In particular, the diagram is partially cut away so that the mounting structure of the cover can be seen. Fig. 4(b) is a cross-sectional view taken along line IVb-IVb in Fig. 4(a). [Diagram 5] Fig. 5 is a diagram showing a schematic internal structure of the left side of the chair 1. In Fig. 5, a part of the diagram is cut away so that the attachment structure of the cover can be seen. [Figure 6] Figure 6 is a diagram for explaining a slat constituting the cover. Figure 6(a) is a schematic diagram of the slat. Figure 6(b) is a cross-sectional view taken along line VIb-VIb in Figure 6(a). [Figure 7] FIG. 7 is a schematic diagram of the cover as viewed obliquely from below. [Figure 8]FIG. 8 is a cross-sectional view taken along line VIIIb-VIIIb in FIG. [Figure 9] Fig. 9 is a cross-sectional view of the slat near the top of the cover, and Fig. 9 shows only the slat to be described. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Chairs according to some embodiments will be described below with reference to the drawings. In the following description, the same elements in the drawings will be given the same reference numerals, and duplicated descriptions will be omitted. In the description, terms indicating directions such as "upper", "lower", "right", "left", "front side", and "rear side" are convenient terms based on the state shown in the drawings.

[0014] FIG. 1 is a schematic perspective view of a chair according to this embodiment. The chair 1 according to this embodiment can have a plate-shaped seat plate 2 having a seat surface. The seat plate 2 extends in the left-right direction. In this embodiment, the left-right direction corresponds to the first direction. The chair 1 can also have a first side wall portion 3 attached to the right end of the seat plate 2, and a second side wall portion 4 attached to the left end of the seat plate 2 facing the first side wall portion. As shown in FIG. 1, the first side wall portion 3 has a plate-like shape, and the first edge surface 3k of the first side wall portion 3 can have a shape that is curved in the extension direction as it goes upward. Similarly, the second side wall portion 4 has a plate-like shape, and the second edge surface 4k of the second side wall portion 4 can have a shape that is curved in the extension direction as it goes upward. In addition, the rear side of the first edge surface 3k can have a shape that extends almost vertically to the ground surface, for example. Also, a back panel 5 may be provided at the back of Fig. 1. The seat panel 2, the back panel 5, the first side wall portion 3, and the second side wall portion 4 are components of an enclosed space, and may be made of a single plate or a composite material with no gaps.

[0015] Referring to FIG. 1, a first guide rail 15 and a second guide rail 16 having an approximately L-shape are joined and fixed to the first side wall portion 3 and the second side wall portion 4, respectively, and each ceiling portion covers a part of the first edge surface 3k and the second edge surface 4k of the side wall portion, and a gap for guiding the cover 6 is formed between the first edge surface 3k and the first guide rail 15, and between the second edge surface 4k and the second guide rail 16. The cover 6 can be opened and closed by moving along this gap. When the chair 1 is in use, the cover 6 can be moved to an open state. On the other hand, when the chair 1 is not in use, the cover 6 can be moved to a closed state to cover the seat panel 2, back panel 5, etc. A handle 7 can be provided on the cover 6 to make it easier to open and close the cover 6.

[0016] The cover 6 is provided to cover the inner surfaces of the seat 2, back 5, and first and second side walls 3 and 4 when the chair 1 is not in use. In particular, when the chair 1 is installed outdoors, the cover 6 can prevent the surfaces of the seat 2, back 5, etc. from getting wet with rain or getting dirty with dust and the like. The cover 6 can also prevent the chair 1 from being exposed to the elements and deteriorating, thereby enhancing the durability of the chair 1.

[0017] Further, the first side wall portion 3 and the second side wall portion 4 have legs 8 formed at their lower ends. The first side wall portion 3 and the second side wall portion 4 may each be provided with two legs.

[0018] 2 is a schematic perspective view of the chair according to this embodiment as viewed from the rear side. A storage section 10 can be provided on the rear side of the back panel 5. When the cover 6 is moved to the rear side of the back panel 5, the cover 6 can be stored in the storage section 10 by moving the cover 6 to the storage section 10 through an opening 11 provided at the top of the storage section 10.

[0019] Next, the storage section 10 will be described in detail. FIG. 3 is a schematic side view of the chair 1 as viewed from the right side. As shown in FIG. 3, the storage section 10 is composed of a first back panel 10a, a second back panel 10b facing the inside of the first back panel 10a, storage section side panels 10c (both left and right) constituting the left and right sides, and a storage section bottom panel 10d constituting the bottom, and a gap for storing the cover 6 is formed inside the storage section 10. An opening 11 for storing the cover 6 is provided on the upper side of the storage section 10. In this embodiment, the size of the opening 11 is designed to be slightly larger than the thickness of the cover 6. This makes it possible to make the gap between the opening 11 and the cover 6 as small as possible when storing the cover 6 in the storage section 10. In addition, the height of the storage section can be adjusted to approximately the upper end of the back panel. As a result, it is possible to prevent dust, rain, etc. from entering through the gap between the opening 11 and the cover 6.

[0020] To make the inside of the bench an airtight space, the back panel 5 and the second back panel 10b are joined at their tops, and the seat panel 2 extends backward and joins with the second back panel 10b. This prevents wind, rain, and dust from blowing up from under the chair 1 and entering the inside. As a result, the surfaces of the seat panel 2 and the back panel 5 can be prevented from getting wet or dirty with rainwater and dust.

[0021] 3(b), a storage section bottom plate 10d provided at the bottom of the storage section 10 can be provided with a plurality of storage section through holes 10e for draining rainwater or the like that has entered the storage section 10. This can prevent rainwater or the like from accumulating within the storage section 10.

[0022] Next, the mounting structure of the cover 6 will be described. Fig. 4 shows a schematic diagram of the mounting structure of the cover 6 of the chair 1. Fig. 4 shows the internal structure of the right side of the chair 1. Fig. 4(b) is a cross-sectional view taken along line IVb-IVb in Fig. 4(a). Fig. 5 shows a schematic diagram of the internal structure of the left side of the chair 1. Note that Figs. 4 and 5 show parts of the cover 6 and the first and second guide rails 15, 16 cut away for ease of understanding.

[0023] 4(a), the first edge surface 3k is composed of a first outer edge surface 3a, a first inner edge surface 3b, and a first edge surface groove 3c. A cover is disposed in the gap formed between the first inner edge surface 3b and the first guide rail 15. Similarly, on the left side of the chair, as shown in Figure 5, the second edge surface 4k consists of a second outer edge surface 4a, a second inner edge surface 4b and a second edge surface groove 4c, and a cover is arranged in the gap formed between the second inner edge surface 4b and the second guide rail 16. The cover is guided between the left and right gaps, allowing the cover to move smoothly. Additionally, the first and second guide rails 15, 16 restrict the upward movement of the cover, preventing it from coming off or being stolen. If the cover were to float upward and bend excessively outward, the fittings could come loose, but the guide rails restrict the upward movement, preventing this. Additionally, the protrusions on the ends of the slats abut against the inner wall of the guard rail, eliminating horizontal displacement of the cover and preventing rainwater and dust from entering the chair from both ends.

[0024] The first edge groove 3c in FIG. 4(a) functions to drop rainwater therein and discharge it to the outside. The width of the first edge groove 3c can be about 20mm to 50mm, and the depth of the groove can be about 20mm to 60mm. The bottom surface of this groove is inclined from the top to the bottom of the chair, so that rainwater flowing in from the slats can drop and be discharged to the outside. The width of the first outer edge surface 3a and the first inner edge surface 3b on both sides of the groove can be, for example, about 10mm to 40mm. The first outer edge surface 3a and the first inner edge surface 3b can also be configured as plates. FIG. 5 shows the structure of the left side wall, which has the same structure as the right side wall described above.

[0025] Additionally, rail-shaped thin metal plates 12 are embedded in the first inner edge surface 3b to guide and support the bottom projections 17 installed on each slat. The bottom projections 17 and the metal plates 12 that receive them reduce friction in the direction of gravity, allowing the cover 6 to move smoothly when opening and closing.

[0026] Next, a detailed structure of the individual metal plates and slats that make up the cover 6 will be described. The cover has a flexible structure in which multiple slats are connected in the second direction. The slats can be made of, for example, a metal material. 6 is a diagram showing one of the slats as viewed from below, with a bottom projection 17 on the bottom side of the end. In addition, a neck protrudes from the center of each end to form an end projection 13. When the cover is opened or closed, the bottom projection 17 comes into contact with the first inner edge surface 3b and the second inner edge surface 4b, and the end projection 13 comes into contact with the inner wall surfaces of the first guide rail 15 and the second guide rail 16, thereby guiding the cover 6 as it moves. The bottom projections 17 may be positioned several centimeters inward from both ends of each slat 14. The bottom projections 17 may have a curved surface with a predetermined curvature at the tip thereof. In this embodiment, the bottom projections 17 have a hemispherical shape. The bottom projections 17 may be made of a metal such as stainless steel. The bottom projections 17 support the weight of each slat and reduce friction when the cover is opened or closed. The end projections 13 prevent the slats from shifting horizontally when the cover is opened or closed, and reduce friction when the cover is opened or closed.

[0027] In Fig. 6(a), when the cover 6 is closed, the upper curved portion 50 of the slat faces upward and the lower curved portion 60 of the slat faces downward. The upper curved portion 50 of the slat rolls backward and the lower curved portion 60 of the slat rolls forward. Fig. 6(b) is a cross-sectional view taken along the line VIb-VIb of Fig. 6(a).

[0028] Next, the structure of the cover will be described. Figure 7 is a schematic diagram of the cover 6 as seen diagonally from below (inside the chair). Both ends of the slats are structured so that the center protrudes and rainwater runs off from both sides of the end protrusions 13. Figure 8 is a cross-sectional view taken along line VIIb-VIIb in Figure 7. Bottom protrusions 17 that support the direction of gravity can be installed at the ends directly below the upper curved parts of each slat.

[0029] The cover is composed of multiple slats arranged in the second direction. All slats can be of the same structure, but as described later, the slats near the top of the cover when closed can be of a different structure. Here, the structure of a normal slat is described. FIG. 8 is a cross-sectional view taken along line VIIb-VIIb in FIG. 7. The second slat 14b, which is one of the normal slats, consists of a straight portion and curved portions at both ends. It is curved in the upward extension direction (second direction), and the downward extension direction is curved in the opposite direction. In addition, in the first joint portion 20, the second slat upper curved portion 50b of the second slat 14b can be curved until the extension direction changes by about 180 degrees by wrapping the first slat lower curved portion 60a of the first slat 14a from the outside. In the second joint portion 30, the second slat lower curved portion 60b of the second slat 14b can be curved until the extension direction changes by about 360 degrees by entering inside the third slat upper curved portion 50c of the third slat 14c. In addition, in both the first joint portion 20 and the second joint portion 30, the curvature ratios of the curved portions of the adjacent slats can be made close to each other to come into surface contact. Surface contact can better prevent rainwater from entering.

[0030] 8, the lower curved portion 60a of the first slat is curved toward the inside of the chair to form a joint. This allows the joint to avoid a position where rainwater flows and allows the rainwater to jump over the joint, reducing water seepage from the joint. In addition, the cover 6 into which the multiple slats 14 are fitted has a simple structure with the minimum number of curved and straight sections required to connect the slats together, and compared to commercially available shutters, the structure has fewer bends in the second direction (vertical direction). This results in a structure with fewer irregularities that impede the flow of rainwater, and the vertical flow of rainwater is resisted by the bent sections and flows horizontally, reducing the amount of water that falls on both ends of the cover 6. As a result, the chair can be designed to prevent water from entering the interior, and the interior of the chair can be kept clean.

[0031] FIG. 9 is a cross-sectional view of the slats near the top when the cover 6 is closed. For the sake of explanation, FIG. 9 shows only the slats near the top. When the cover 6 is closed, it is necessary to cover the front of the chair 1 and cover the back panel 5 from the top to a little below the top end to protect the inside of the chair from wind, rain, and dust. Although it is possible to unify the structure of all the slats of the cover 6, it is also possible to have a structure in which the fourth slat 14d and the fifth slat 14e are suspended from the top slat 14f near the top as shown in FIG. 9. In this structure, the curved portions of the slats 14f near the top at both ends in the second direction are curved in the same direction toward the inside of the chair. The curved portions at both ends of the top slat 14f are curved in a different direction from, for example, the second slat 14b shown in FIG. 8. In addition, the curved portions at both ends are structured to wrap the curved portions of the adjacent fourth slat 14d and fifth slat 14e from the outside.

[0032] If only the slats 14f near the top are configured to be folded inward at both the front and rear as shown in FIG. 9, rainwater will jump over the joints at both the front and rear, making it easier to prevent water intrusion. In addition, the inclination of the front and rear slats is greater near the top, but the greater the inclination of the connection, the deeper the fit. This makes it possible to better prevent water from entering the interior of chair 1 through the slat joint near the top.

[0033] When the top slat is used, the curvature direction of the joint of the slat behind the top slat will be reversed in the left-right direction in Figure 8. The inside and outside directions of the chair are the same.

[0034] To make it easier to open and close, a separation plate can be provided in the center of the bench to separate it into two shutters. Depending on the length of the bench, it is also possible to have a structure with three or more shutters. The separator may have a structure including a groove or the like, similar to the first side wall 3 and the second side wall 4.

[0035] While the principles of the present invention have been illustrated and described in preferred embodiments, it will be recognized by those skilled in the art that the invention may be modified in arrangement and detail without departing from such principles. The invention is not limited to the specific constructions disclosed in the present embodiments. We therefore claim all modifications and changes that come within the scope and spirit of the following claims. [Explanation of symbols]

[0036] 1 Chair 2 Seat board 3 First side wall 3k 1st edge 3a First outer edge 3b First inner edge 3c First edge groove 4 Second side wall 4k 2nd edge 4a Second outer edge 4b Second inner edge 4c Second edge groove 5 Back plate 6 Cover 7 Toride 8 legs 10 Storage area 10a 1st back plate 10b 2nd back plate 10c Storage section side panel 10d Storage bottom plate 10e Storage section through hole 11 Opening 12 metal plate 13 End protrusion 14 Slats 14a 1st slat 14b 2nd slat 14c 3rd slat 14d 4th slat 14e 5th slat 14f Top slat 15 First guide rail 16 Second guide rail 17 Bottom protrusion 20 First mating part 30 Second mating part 50 Slat upper curved part 50a First slat upper curved portion 50b Second slat upper curved portion 50c Third slat upper curved part 60 Slat lower curved part 60a Lower curved part of first slat 60b Lower curved portion of second slat

Claims

1. A seat plate having a seat surface; The seat includes a first side wall portion and a second side wall portion each having a plate-like shape and provided at both ends of the seat plate, and a cover that covers the seat surface and can be opened and closed by moving diagonally forward and backward, Each of the first side wall portion and the second side wall portion has an edge surface that extends obliquely upward from the front and has a curved shape that is convex upward as it extends, the cover is slidably supported on the edge surfaces of the first side wall portion and the second side wall portion, The cover is formed by connecting a plurality of slats, Each of the plurality of slats has a curved portion provided at both ends in a width direction intersecting with a length direction of the slat, and the curved portions are fitted and connected to each other, the plurality of slats include a top slat arranged to be located near a top of the cover when the cover is closed; A chair characterized in that the curved portion of the top slat is curved towards the seat of the chair.

2. The device further includes a first guide rail and a second guide rail joined and fixed to the first side wall portion and the second side wall portion, respectively, and having a substantially L-shape, The chair described in claim 1, characterized in that the ceiling portions of the first guide rail and the second guide rail cover a portion of the edge surfaces of the first side wall portion and the second side wall portion, respectively, and gaps for guiding the cover are formed between the edge surface of the first side wall portion and the first guide rail, and between the edge surface of the second side wall portion and the second guide rail.

3. The cover includes a first slat and a second slat connected to each other; The first slat has an upper curved portion at one end side in a first width direction intersecting with a longitudinal direction of the first slat, A lower curved portion is provided on the other end side in the first width direction, The second slat has an upper curved portion at one end side in a second width direction intersecting with the longitudinal direction of the second slat, and has a lower curved portion at the other end side in the second width direction, The first slat lower curved portion is curved in a direction opposite to a curved direction of the first slat upper curved portion, The second slat lower curved portion is curved in a direction opposite to a curved direction of the second slat upper curved portion, The chair described in claim 1, characterized in that at the fitting portion where the first slat and the second slat are fitted together, the second slat is connected to the first slat by hanging the second slat upper curved portion of the second slat so as to cover along the outer edge side of the first slat lower curved portion of the first slat.

4. The device further includes a first guide rail and a second guide rail joined and fixed to the first side wall portion and the second side wall portion, respectively, and having a substantially L-shaped configuration; The first slat has a bottom surface protrusion having a curved surface on a bottom surface side of an end portion of the first slat in a longitudinal direction, and an end surface protrusion having a convex shape on a side surface side of the end portion of the first slat, The chair described in claim 3, characterized in that when the cover is opened or closed, the bottom protrusion of the first slat abuts against the edge surface of the first side wall portion or the second side wall portion, and the end protrusion abuts against the inner wall surface of the first guide rail or the second guide rail and is guided thereby while the cover moves.

5. a groove portion for draining rainwater from the cover is provided on an edge surface of the first side wall portion or the second side wall portion; 2. The chair according to claim 1, wherein the bottom surface of the groove is inclined from the top to the bottom of the chair.

6. A seat plate having a seat surface, a first side wall portion and a second side wall portion each having a plate-like shape and provided at both ends of the seat plate; a cover that covers the seat surface and can be opened and closed by moving diagonally forward and backward; a first guide rail and a second guide rail joined and fixed to the first side wall portion and the second side wall portion, respectively, and having a substantially L-shape; Each of the first side wall portion and the second side wall portion has an edge surface that extends obliquely upward from the front and has a curved shape that is convex upward as it extends, the cover is slidably supported on the edge surfaces of the first side wall portion and the second side wall portion, The cover includes a first slat and a second slat connected to each other; The first slat has an upper curved portion at one end side in a first width direction intersecting with a longitudinal direction of the first slat, and a lower curved portion at the other end side in the first width direction, The second slat has an upper curved portion at one end side in a second width direction intersecting with the longitudinal direction of the second slat, and has a lower curved portion at the other end side in the second width direction, The first slat lower curved portion is curved in a direction opposite to a curved direction of the first slat upper curved portion, The second slat lower curved portion is curved in a direction opposite to a curved direction of the second slat upper curved portion, At a fitting portion where the first slat and the second slat are fitted together, the second slat is connected to the first slat by hanging the second slat upper curved portion of the second slat so as to cover an outer edge side of the first slat lower curved portion of the first slat, The first slat has a bottom surface protrusion having a curved surface on a bottom surface side of an end portion of the first slat in a longitudinal direction, and an end surface protrusion having a convex shape on a side surface side of the end portion of the first slat, A chair characterized in that, when the cover is opened or closed, the bottom protrusion of the first slat abuts against the edge surface of the first side wall portion or the second side wall portion, and the end protrusion abuts against the inner wall surface of the first guide rail or the second guide rail and is guided thereby while the cover moves.

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