Seat saved state display device, and chair or backrest cover including the same

Abstract

To provide a seat saved state display device allowing other people to recognize a seat saved state by representing that the seat is saved, in a simple configuration.SOLUTION: A seat saved state display device 14 provided on a chair 10 including a seat surface 11a and a backrest 13 and displaying that the chair 10 is saved as a seat, includes a movable bar 20 provided on the backrest 13 of the chair 10. The movable bar 20 is switchable between a standard position where the movable bar does not interfere with a person sitting on the seat surface 11a of the chair 10 and a tilted position where the movable bar is disposed on the seat surface 11a or at a position projecting above the seat surface 11a and interferes with a person trying to sit on the seat surface 11a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a seat occupation status display device and a chair or back cover equipped with the same. [Background technology]

[0002] For example, in facilities such as food courts, stadiums, and theaters, users may temporarily leave a seat they have reserved in order to order food, go to the restroom, take a break, etc. In such cases, it is common for users to keep the seat they reserved by placing a personal item such as a handkerchief on a table or seat to keep the seat even while they are away from the facility. Also, depending on the type of facility, a seat keeping system is known that has a function to display the fact that the user is away from the seat (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-94669 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional method of placing personal belongings on a table or seat to secure a seat is not desirable because there is a risk of theft of personal belongings. Also, introducing a new system with a display function would entail a high cost burden.

[0005] The present invention has been made in consideration of the above circumstances, and aims to provide a seat reservation status display device that can display, with a simple structure, that the seat is reserved and can be recognized by others. It is also an object of the present invention to provide a chair and a backrest cover equipped with the seat reservation status display device. [Means for solving the problem]

[0006] In order to solve the above problems, the seat reservation status display device of the present invention is A seat securing state display device is provided on a chair having a seat surface and a backrest portion, and displays that the chair is secured as a seat, A movable portion is provided on the backrest portion, The movable part is The chair is characterized by being switchable between a first position in which it does not interfere with a person sitting on the seat of the chair, and a second position in which it is positioned on the seat or at a position protruding above the seat and interferes with a person attempting to sit on the seat. Effect of the Invention

[0007] According to the present invention, when the movable bar is placed in the first position, it does not interfere with the seated person and can function as a chair. On the other hand, if a user of the chair temporarily leaves the seat after reserving the chair, the movable bar can be rotated to the second position to indicate that the chair has already been reserved by someone else and to allow others to recognize that the seat is reserved. Unlike the case of introducing a system, this effect can be achieved with a simple configuration of providing a position-switchable movable part in the backrest, and does not incur high cost burdens. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view showing a chair equipped with a seat securing state display device. [Diagram 2] 2 is an enlarged cross-sectional view of part X in FIG. 1, in which (a) shows a state in which the movable bar is disassembled, and (b) shows a state in which the movable bar is attached. [Diagram 3] 2A and 2B are enlarged views of part X in FIG. 1 as viewed from the side, in which (a) shows the movable bar in a reference position and (b) shows the movable bar in a reclined position. [Figure 4] FIG. 13 is a perspective view showing a backrest cover with a seat occupancy status display device. [Diagram 5] FIG. 13 is a perspective view showing the backrest cover with a part of the movable bar omitted. [Figure 6] FIG. 2 is a perspective view showing the backrest cover attached to the chair. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The seat securing state display device of the present invention will be described below with reference to the drawings. The seat securing state display device may be provided on the back of a chair or on a back cover attached to the back of a chair. The former will be described as the first embodiment, and the latter will be described as the second embodiment.

[0010] (First embodiment) 1, a chair 10 of the first embodiment has a seat 11 having a seat surface 11a, legs 12 supporting the seat 11, and a backrest 13 provided behind the seat 11. Note that the chair 10 is not limited to the configuration or shape shown in the figure, and may be provided with other parts such as armrests and a headrest, and the legs 12 may be a single leg or may be provided with casters.

[0011] The chair 10 is provided with a seat-occupied state display device 14 on its backrest portion 13. The seat-occupied state display device 14 has a movable bar 20 and a pivot mechanism 30 that pivotally supports the movable bar 20 so that the movable bar 20 can rotate.

[0012] The movable bar 20 is formed of any material such as metal or resin. The movable bar 20 has a horizontal section 21 extending laterally and a pair of arms 22, and the left and right ends of the horizontal section 21 and the upper ends of the arms 22 are connected to form a U-shape as a whole. The horizontal section 21 and the arms 22 may be provided integrally without a connecting portion, or may be connected to form an integral body. The horizontal section 21 extends horizontally along the upper side of the backrest 13. The arms 22 are provided on both sides of the backrest 13, extend along the sides of the backrest 13, and are parallel to each other. Such a state of the movable bar 20 is referred to as a reference position. The movable bar 20 corresponds to the movable section, and the reference position corresponds to the first position.

[0013] The pivot mechanism 30 is provided at the end of each of the pair of arms 22 opposite to the end connected to the cross member 21, and pivotally supports the pair of arms 22 to be rotatable relative to the side of the backrest 13. This rotation is restricted when the cross member 21 of the movable bar 20 is located above the seat surface 11a of the chair 10. In this first embodiment, as shown in FIG. 1, the movable bar 20 is horizontal and the rotation of the movable bar 20 is restricted when the cross member 21 is located above the seat surface 11a. The position where the movable bar 20 is thus tilted forward is defined as the tilted position. The movable bar 20 is pivotally supported by the pivot mechanism 30 so as to rotate within a range between the reference position and the tilted position. The tilted position corresponds to the second position.

[0014] The dimensions of the arms 22 of the movable bar 20 are set so that when the movable bar 20 is in the reclined position, the amount of protrusion from the front surface of the backrest is smaller than the amount of protrusion from the seat surface 11a. The amount of protrusion is preferably 30 cm or less, and more preferably 20 cm or less. By ensuring such an amount of protrusion, the movable bar 20 can be used without design changes even when the height of the backrest 13 is low. Also, if the amount of protrusion is too small, it becomes difficult to see that the seat is secured, so the amount of protrusion is preferably 5 cm or more, and more preferably 10 cm or more.

[0015] As shown in Figures 2 and 3, the pivot mechanism 30 has an axle 31 provided on the side of the backrest 13, and an axle mounting hole 33 provided in the arm 22 of the movable bar 20. As shown in Figure 2(a), the axle 31 protrudes laterally from the side of the backrest 13 and has an elliptical shape extending in the front-rear and horizontal directions. A retaining portion 32 is provided at the protruding end of the axle 31. The retaining portion 32 has an elliptical shape that is larger than the axle 31 over its entire circumference. The axle 31 and the retaining portion 32 are made of any material, such as metal or resin.

[0016] On the other hand, the shaft mounting hole 33 penetrates from the inside to the outside of the arm 22 in the same direction (left-right direction) as the extension direction of the cross section 21 of the movable bar 20. The shaft mounting hole 33 has a diameter slightly longer than the long axis length of the shaft 31. A recess 34 is provided on the outside opposite to the inside of the arm 22 (the side facing the side of the backrest 13). The shaft mounting hole 33 opens at the bottom of this recess 34. This opening is referred to as the outer opening 33a, and the opposite inner opening is referred to as the inner opening 33b.

[0017] The shaft 31 is inserted into the shaft mounting hole 33 by inserting the shaft 31 obliquely from the inner opening 33b of the shaft mounting hole 33, and the retaining portion 32 is disposed in the recess 34 as shown in FIG. 2(b). The retaining portion 32 is formed larger than the shaft 31, so that the retaining portion 32 is caught on the opening edge of the outer opening 33a of the shaft mounting hole 33. This prevents the shaft 31 from being removed and keeps it inserted in the shaft mounting hole 33. The shaft mounting hole 33 has an outer diameter slightly larger than the long axis length of the shaft 31, and there is a play between them. Therefore, the arm 22 in which the shaft mounting hole 33 is provided is rotatable around the center C of the shaft mounting hole 33.

[0018] As shown in FIG. 3, the shaft mounting hole 33 is provided with a pair of rotation restricting portions 35, 36 that protrude toward the center of the hole. The pair of rotation restricting portions 35, 36 have first abutting portions 35a, 36a that abut against the shaft portion 31 when the movable bar 20 is in the reference position, and second abutting portions 35b, 36b that abut against the shaft portion 31 when the movable bar 20 is in the reclined position. As shown in FIG. 3(a), when the movable bar 20 is in the reference position, in the first rotation restricting portion 35 located on the lower left side of the shaft portion 31, the first abutting portion 35a abuts against the shaft portion 31 at its lower left side, and in the second rotation restricting portion 36 located on the upper right side of the shaft portion 31, the first abutting portion 36a abuts against the shaft portion 31 at its upper right side. In this way, the first abutting portions 35a, 36a abut against the shaft portion 31, thereby restricting the movable bar 20 from rotating further to the right. The terms "left and right" and "up and down" used herein are based on the state shown in FIG. 3, and the same applies to the explanation in the next paragraph.

[0019] 3(b), in the laid-down position in which the movable bar 20 is placed by rotating leftward from the reference position, the second contact portion 36b of the second rotation restricting portion 36 located on the upper left side of the shaft portion 31 abuts on the upper left side of the shaft portion 31. Also, the second contact portion 35b of the first rotation restricting portion 35 located on the lower right side of the shaft portion 31 abuts on the lower right side of the shaft portion 31. As a result of the second contact portions 35b, 36b abutting on the shaft portion 31 in this manner, further rotation of the movable bar 20 in the leftward direction is restricted.

[0020] According to the chair 10 of the first embodiment, when the movable bar 20 is placed in the standard position, the movable bar 20 does not interfere with the person sitting on the chair, and therefore the chair 10 can function as such. When a user of the chair 10 temporarily leaves the chair after securing the chair 10 as a seat, the movable bar 20 is rotated to the reclined position. In the reclined position, the movable bar 20 is located above the seat surface 11a, and even if another user attempts to sit on the chair, the movable bar 20 interferes with the seat and the other user cannot sit on the chair. Therefore, the movable bar 20 placed in the reclined position indicates that the chair 10 has already been secured as a seat by another person, and the other person recognizes that the seat is secured.

[0021] When the user returns to his / her seat, he / she can use the chair 10 again by rotating the movable bar 20 from the reclined position back to the standard position. If the user leaves his / her seat not temporarily, he / she can leave the seat without operating the movable bar 20, and the movable bar 20 will remain in the standard position, and other people will recognize the chair 10 as an unoccupied seat.

[0022] Furthermore, if the movable bar 20 remains in the reclined position, the user cannot sit down because the movable bar 20 interferes with the seating, and if the user who has reserved the seat wishes to use the seat again, the movable bar 20 must be returned to the standard position. In other words, once the chair 10 is used, the movable bar 20 is placed in the standard position by the person who is about to sit down. Therefore, if the user simply leaves the chair 10 after using it without having to rotate the movable bar 20, it is indicated that the chair 10 is vacant.

[0023] Second embodiment As described above, the second embodiment is the backrest cover 40 (see FIG. 4). Here, the configuration different from the first embodiment will be mainly described. Note that, in the following description, "chair 50" has a seat portion 51, legs 52, and a backrest portion 53 like the chair 10 of the first embodiment, but unlike the chair 10 of the first embodiment, the backrest portion 53 is not provided with a device equivalent to the seat secured state display device 14.

[0024] As shown in Fig. 4, the backrest cover 40 of the second embodiment is attached to the backrest portion 53 of a chair 50 (see Fig. 6). The backrest cover 40 has a cover body 60 and a seat secured state display device 41. The seat secured state display device 41 includes an inner frame 70, a movable bar 80, and a pivot mechanism 90 that pivotally supports the movable bar 80 so that it can rotate.

[0025] The cover body 60 is formed in a bag shape so as to be attached to the backrest portion 53 of the chair 50, and has a substantially rectangular shape in a front view. An opening 61 is provided at the lower side of the four sides of the cover body 60, which communicates the inside and outside of the bag. The opening 61 is used to cover the backrest portion 53 with the cover body 60, or to remove the cover body 60 from the backrest portion 53. The cover body 60 is formed of any material, such as cloth, leather, resin, or nonwoven fabric. The cover body 60 may be provided with ventilation holes such as mesh. The size of the cover body 60 is set according to the size of the backrest portion 53 of the chair 50 to which it is to be attached, or it may be made stretchable so that it can be attached to chairs 50 having backrest portions 53 of different shapes, sizes, etc.

[0026] The inner frame 70 is provided inside the cover body 60. The inner frame 70 is formed of any material such as metal or resin. As shown in FIG. 5, the inner frame 70 has a horizontal frame portion 71 extending in the horizontal direction and a pair of vertical frame portions 72, and the left and right ends of the horizontal frame portion 71 are connected to the upper ends of the vertical frame portions 72 to form a U-shape as a whole. The horizontal frame portion 71 and the vertical frame portion 72 may be provided integrally without a connecting portion, or may be connected to each other to form an integral body. The inner frame 70 may be attached to the cover body 60 in any manner. For example, a frame insertion portion (not shown) may be provided on the inside of the upper side portion and the left and right sides of the cover body 60, and the inner frame 70 may be inserted into the frame insertion portion, or the inner frame 70 may be attached to the cover body 60 using a hook-and-loop fastener.

[0027] As shown in Fig. 4, the movable bar 80 is provided outside the cover body 60. The movable bar 80 is formed of any material such as metal or resin. The movable bar 80 has a horizontal section 81 extending laterally and a pair of arms 22, and the left and right ends of the horizontal section 81 are connected to the upper ends of the arms 82 to form an overall U-shape. The horizontal section 81 and the arms 82 may be provided integrally without a connecting portion, or may be connected to each other to form an integral body.

[0028] The horizontal portion 81 extends horizontally along the upper edge of the cover body 60 on the outside of the cover body 60. The horizontal portion 81 also extends parallel to the horizontal frame portion 71 of the inner frame 70, sandwiching the cover body 60 therebetween, and the two overlap vertically. The pair of arms 82 also extend parallel to the vertical frame portion 72 of the inner frame 70, sandwiching the cover body 60 therebetween, and the two overlap horizontally. This state of the movable bar 80 is referred to as the reference position. The movable bar 80 corresponds to the movable portion, and the reference position corresponds to the first position.

[0029] The pivot mechanism 90 is provided on the end of each of a pair of arms 82 of the movable bar 80 opposite to the end connected to the horizontal frame 81, and pivotally supports the pair of arms 82 rotatably relative to the vertical frame 72 of the inner frame 70. The pivot mechanism 90 has the same configuration as the pivot mechanism 30 of the movable bar 20 in the first embodiment. Therefore, the movable bar 80 is provided rotatably between a reference position and a reclined position in which the movable bar 80 is horizontal and the horizontal frame 81 is provided above the seat surface 51a. The reclined position corresponds to the second position.

[0030] In the second embodiment, the dimensions of the arms 82 of the movable bar 80 are set so that when the movable bar 80 is in the reclined position, the amount of protrusion from the front surface of the backrest is smaller than the amount of protrusion from the seat surface 51a. The amount of protrusion is preferably 30 cm or less, and more preferably 20 cm or less. By ensuring this level of protrusion, the backrest cover 40 can be attached to a chair 50 with a low backrest 53 without design changes. Also, if the amount of protrusion is too small, it becomes difficult to see that the seat is secured, so the amount of protrusion is preferably 5 cm or more, and more preferably 10 cm or more.

[0031] The backrest cover 40 of the second embodiment is attached to the backrest 53 of the chair 50 by using the opening 61 at the bottom side, as shown in Fig. 6. The chair 50 provided with the backrest cover 40 can function as a chair 50 by placing the movable bar 80 in the reference position, and by placing the movable bar 80 in the reclined position, it is indicated that the chair 50 has been secured by another person. Therefore, even for a chair 50 not provided with a seat secured state display device 14, the same effect as the chair 10 of the first embodiment can be obtained by attaching the backrest cover 40.

[0032] (Effects of the embodiment) The advantages of the above two embodiments can be summarized as follows.

[0033] (1) When the movable bar 20, 80 of the seat securing state display device 14, 41 is placed in the standard position, the movable bar 20, 80 is located at the upper edge of the backrest portion 13, 53 of the chair 10, 50, so that even if a person sits down and leans against the backrest portion 13, 53, the person's back does not interfere with the movable bar 20, 80. Therefore, the chair 10, 50 can function as it is without making the person sit down feel uncomfortable. On the other hand, if the movable bar 20,80 is placed in the reclined position, the movable bar 20,80 will be above the seat surface 11a,51a, and will interfere with the person trying to sit down, making it impossible for them to sit down. Therefore, if a user of the chair 10,50 temporarily leaves the chair 10,50 after securing it, the movable bar 20,80 is rotated to the reclined position. This indicates that the chair 10,50 has already been secured by someone else, and also allows the other person to recognize that the seat is secured.

[0034] (2) In order for a user of the chair 10,50 to sit down, the movable bar 20,80 must be placed in the reference position. Therefore, after using the chair 10,50, the user can simply leave the chair without having to rotate the movable bar 20,80, thereby indicating that the chair 10,50 is vacant.

[0035] (3) When the seat secured state display device 14 is provided on the chair 10 itself, the above functions and effects (1) and (2) can be realized with a simple configuration in which the U-shaped movable bar 20 is directly and rotatably supported on the backrest 13 of the chair 10. Also, when the seat secured state display device 41 is provided on the backrest cover 40, the above functions and effects (1) and (2) can be realized with a simple configuration in which the U-shaped movable bar 80 is rotatably supported on the inner frame 70 inside the cover body 60. Therefore, there is no need to incur high costs in order to realize these functions and effects.

[0036] (4) The backrest cover 40 makes it possible to install the seat secured state display device 41 on an existing chair 50, so that the seat secured state display device 41 can be installed on the chair 50 at low cost without having to purchase a new chair 10 equipped with a seat secured state display device 14.

[0037] (5) In the backrest cover 40, the inner frame 70 is provided, and the movable bar 80 is rotatably supported by the inner frame 70. Therefore, it is possible to improve the durability of the movable bar 80 that is repeatedly rotated.

[0038] (6) In the backrest cover 40, the inner frame 70 is configured to have a pair of vertical frame parts 72 and a horizontal frame part 71 connecting the upper ends of the vertical frame parts 72 and the horizontal frame part 71. Therefore, the cover body 60 is reinforced from the inside by the inner frame 70, and the strength of the backrest cover 40 can be ensured. In addition, when the movable bar 80 is placed in the reference position, the horizontal part 81 and the horizontal frame part 71 of the inner frame 70 overlap with the cover body 60 sandwiched between them, and the cover body 60 is pulled by the rotation of the movable bar 80, improving wrinkles and sagging that cause discomfort to the back. In addition, when the recessed part of the movable bar 80 and the horizontal frame part 71 overlap in this way, the backrest cover 40 can be easily handled when not attached to the chair 50.

[0039] The present invention is not limited to the above-described embodiments, and may adopt the following configurations, for example.

[0040] (a) The pivot mechanism 30,90 for the movable bar 20,80 may have any configuration as long as it is configured to pivotally support the movable bar 20,80 within a regulated range between the reference position and the reclined position. For example, the movable bar 20,80 may be pivotally supported so as to be freely rotatable, while a stopper that abuts against the movable bar 20,80 to prevent it from pivoting rearward from the reference position or toward the seat surface from the reclined position may be provided on the backrest 13 or the cover body 60. Also, the pivot configuration may be such that the play between the axle 31 and the axle attachment hole 33 is reduced to the extent that a certain force is required to pivot the movable bar 20,80, thereby preventing the movable bar 20,80 from being in the reference position from tipping over to the reclined position due to slight vibration.

[0041] (b) The rotation angle of the movable bar 20, 80 between the reference position and the reclined position is arbitrary. The reference position is sufficient as long as it is a position where the seated person does not interfere when sitting, and may be, for example, a state where it is located further back than the state illustrated in each embodiment. The reclined position is also sufficient as long as it is located above the seat surface 11a, 51a and interferes with the person who is trying to sit, and may be, for example, a state where it is located closer to the seat surface 11a, 51a than the state illustrated in each embodiment. The reclined position may be a position where the movable bar 20, 80 is located above the seat surface 11a, 51a.

[0042] (c) In each of the above embodiments, the U-shaped movable bar 20, 80 is the movable part, and the pair of arms 22, 82 are rotatably supported by the axis, and the movable bar 20 is switched between the reference position as the first position and the reclined position as the second position by rotating between the reference position and the reclined position. As long as this function can be realized, the movable part and the configuration for switching the movable bar 20 to the first position and the second position are arbitrary. For example, in the chair 10 of the first embodiment, a groove may be formed on the front surface of the backrest 13, and the position where the movable bar 20 is accommodated in the groove may be the first position, and the position where the movable bar 20 is pulled out forward from the groove may be the second position.

[0043] Also, a configuration may be adopted in which a rod-shaped member (corresponding to a movable part) extending along the backrest part 13, 53 is accommodated in a groove part provided on the front surface of the backrest part 13, 53, and the rod-shaped member is rotatably provided so as to fall forward. In this case, the state in which the rod-shaped member is accommodated in the backrest part 13, 53 is the first position, and the state in which it is tilted forward is the second position. This configuration can be realized even in the backrest cover 40 of the second embodiment, because it is possible to provide a recess for accommodating the rod-shaped member by forming the front surface part of the cover body 60 thick.

[0044] Alternatively, in the case of the chair 10 of the first embodiment, it is possible to adopt a configuration in which the backrest portion 13 is divided into two parts, front and rear, and the front part is provided rotatably so as to be tilted forward. In this case, the part of the backrest portion 13 that tilts forward functions as a movable part.

[0045] (d) In the chair 10 of the first embodiment, a groove may be formed on the upper edge or front side of the side of the backrest 13, and the movable bar 20 in the reference position may be configured to fit into the groove. This configuration eliminates the state in which the movable bar 20 protrudes outward from the backrest 13. This makes it easier to grasp the upper edge of the backrest 13 when moving the chair 10, and creates a neat appearance as if the movable bar 20 were part of the backrest 13.

[0046] (e) In the backrest cover 40 of the second embodiment, the cover body 60 is formed in a bag shape, but as long as it can be attached to the backrest portion 53 of the chair 50, the cover body 60 may be configured in a shape other than a bag, for example, in the shape of an apron or an apron. Also, a vertically extending slit may be provided in the rear portion of the cover body 60, and a zipper may be provided in the slit so that the cover can be attached to the backrest portion 53 while opening and closing it.

[0047] (f) In the above second embodiment, the backrest cover 40 is attached only to the backrest portion 53 of the chair 50, but it may also be a chair cover that is integrated with a seat cover that is placed over the seat portion 51.

[0048] (g) The backrest cover 40 of the second embodiment is provided with an inner frame 70 having a horizontal frame portion 71 and a pair of vertical frame portions 72, but it is sufficient for the inner frame 70 to have at least a pair of vertical frame portions 72. Even without the horizontal frame portions 71, the upper edge portion of the cover main body 60 is supported by the upper end portion of the backrest portion 53 of the chair 50, the backrest cover 40 can be kept covered over the backrest portion 53, and the vertical frame portions 72 can pivotally support the movable bar 80. [Explanation of symbols]

[0049] 10...chair, 11a...seat, 13...backrest, 14...seat securing state display device, 20...movable bar (movable part), 21...horizontal frame, 40...backrest cover, 41...seat securing state display device, 50...chair, 51a...seat, 53...backrest, 60...cover body, 70...inner frame, 71...horizontal frame, 72...vertical frame, 80...movable bar (movable part), 81...horizontal frame.

Claims

1. A seat securing state display device is provided on a chair having a seat surface and a backrest portion, and displays that the chair is secured as a seat, A movable portion is provided on the backrest portion, The movable part is The seat securing status display device is switchable between a first position that does not interfere with a person sitting on the seat of the chair and a second position that is positioned on the seat or at a position protruding above the seat and interferes with a person attempting to sit on the seat.

2. The seat securing state display device according to claim 1 is provided in the backrest of a chair, The movable portion is pivotally supported on the backrest portion, A chair that can be switched between the first position and the second position by rotating the movable part.

3. 3. The chair according to claim 2, wherein the movable portion is U-shaped, and both ends of the movable portion are rotatably supported by the backrest portion.

4. The chair according to claim 3 , wherein when the movable section is disposed at the second position, a horizontal portion of the movable section is disposed at a position along an upper side of the backrest section.

5. A seat back cover is provided with the seat securing state display device according to claim 1 and is placed over at least the backrest portion, A cover body that is placed over the backrest portion; an inner frame provided inside the cover body; Equipped with The movable portion is rotatably supported by the inner frame, The backrest cover is switched between the first position and the second position by rotating the movable part.

6. The inner frame has a pair of vertical frame portions provided on both left and right sides of the cover body, 6. The backrest cover according to claim 5, wherein the movable portion is U-shaped, and both ends of the movable portion are rotatably supported by the vertical frame portions.

7. The inner frame has a pair of vertical frame portions and a horizontal frame portion connecting upper ends of the vertical frame portions, The pair of vertical frame portions are provided on both left and right sides of the cover body, The backrest cover according to claim 5 , wherein the horizontal frame portion is disposed at a position along an upper side of the cover body.

8. The chair according to claim 7 , wherein when the movable part is disposed at the second position, a lateral portion of the movable part is disposed at a position along an upper side of the cover body.

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