Chair set and optional parts

Abstract

To provide a technique for stacking chairs with optional parts attached to the chairs. [Solution] The optional part has an upper part, a lower part located below the upper part, and a fixing part that fixes the upper and lower parts to a stackable chair. The upper part has at least portions arranged opposite each other across an axis, forming an entrance for putting in and taking out a predetermined item. The lower part covers at least one of the side and bottom surfaces of the predetermined item, and the front and rear sides of the lower area of ​​the upper part in the fore-and-aft direction of the chair are open. In the stacked state, the first optional part and the second optional part are configured so that a portion of the upper part of the second optional part overlaps above the first optional part, and the lower part of the second optional part overlaps in front of the first optional part.

Description

[Technical Field]

[0001] The present disclosure relates to chair sets and optional components. [Background technology]

[0002] Patent Document 1 discloses a chair in which a container holder capable of holding containers such as plastic bottles is attached to a support part fixed to the seat so as to be positioned in an area above and to the left of the seat. The container holder rotates about a rotation axis of the support part that extends in the front-to-rear direction of the chair between a first position located to the right of the support part and overlapping the seat in the vertical direction, and a second position located to the left of the support part and not overlapping the seat in the vertical direction. The chair is vertically stackable when the container holder is in the second position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-55028 Summary of the Invention [Problem to be solved by the invention]

[0004] Stackable chairs can take on a wide variety of shapes depending on the environment and purpose in which they are used. Recently, there has been a trend toward attaching optional parts capable of holding containers such as plastic bottles to chairs of a wide variety of shapes. Therefore, there is a demand for chairs that can be stacked while still equipped with optional parts that can be attached to chairs of a wide variety of shapes.

[0005] An object of one aspect of the present disclosure is to provide a technique that allows chairs to be stacked while optional parts are attached to the chairs. [Means for solving the problem]

[0006] One aspect of the present disclosure is a chair set including stackable chairs and an optional part attached to the chair and configured to hold a predetermined object. The optional part is configured to allow the predetermined object to be placed in and removed along an axis extending substantially in the vertical direction of the chair. The optional part also has an upper part, a lower part, and a fixed part. The upper part has at least portions arranged opposite each other across the axis, forming an entrance for placing and removing the predetermined object. The lower part is located below the upper part. The lower part is configured to cover at least one of the side and bottom surfaces of the predetermined object, and to leave the front and rear sides of the lower region of the upper part open in the fore-and-aft direction of the chair. The fixed part is configured to fix the upper and lower parts to the chair. In a stacked state in which the second chair is stacked above the first chair, the first optional part fixed to the first chair and the second optional part fixed to the second chair are configured so that a part of the upper part of the second optional part overlaps above the first optional part, and the lower part of the second optional part overlaps in front of the first optional part. The first chair and the second chair are chairs. The first optional part and the second optional part are optional parts.

[0007] In this configuration, when the second chair is stacked above the first chair, the second optional part is also stacked above and in front of the first optional part, so the chairs can be stacked with the optional parts still attached to them.

[0008] In one aspect of the present disclosure, the chair may have a seat configured to allow a user of the chair to sit on it. The width of the upper part in the approximately vertical direction may be less than a first chair pitch in the approximately vertical direction between the seat of the first chair and the seat of the second chair in the stacked state.

[0009] With this configuration, chairs with optional parts attached can be stacked at the same vertical height as when chairs without optional parts attached are stacked individually.

[0010] In one aspect of the present disclosure, the lower portion may have a bottom portion and side portions. The bottom portion extends in the left-right direction of the chair and is configured to be able to support the bottom surface of a predetermined object. The side portions extend upward from at least one left-right end of the bottom portion and connect to the upper portion.

[0011] With this configuration, the bottom and side surfaces of the specified object are supported by the bottom and side portions, so the specified object can be held more stably than in a configuration in which the lower portion only has side portions or a bottom portion.

[0012] In one aspect of the present disclosure, the side sections may have overlapping regions in the generally vertical direction that are configured to overlap the front of the upper section in the stacked state. The front-to-rear width of the overlapping regions of the side sections may be less than a second chair pitch in the front-to-rear direction between the seats of the first chair and the second chair in the stacked state.

[0013] With this configuration, chairs with optional parts attached can be stacked with the same width in the front-to-back direction as when chairs without optional parts attached are stacked individually.

[0014] In one aspect of the present disclosure, the bottom portion may have a main body portion and an extension portion. The extension portion extends on the same plane as the main body portion and extends rearward from the main body portion. The extension portion may be configured such that at least the left-right width of the extending tip portion is narrower than the left-right width of the main body portion, and the extension portion may extend to a position where the tip portion does not intersect with a plane connecting the lower edges of the front ends of the upper portions of the first optional component and the second optional component in a stacked state.

[0015] According to this configuration, it is possible to increase the area of ​​the bottom portion for supporting the bottom surface of a predetermined object while suppressing the influence on stacking of the first optional part and the second optional part.

[0016] In one aspect of the present disclosure, the chair may have a seat configured to allow a user of the chair to sit on it, and the optional component may be disposed in a front region and a lower region of the seat such that at least a portion of the optional component overlaps the seat in a substantially vertical direction.

[0017] With this configuration, in the stacked state, the first optional part attached to the first chair can easily be accommodated in the area below the seat of the second chair positioned above.

[0018] In one aspect of the present disclosure, the chair may have a seat configured to allow a user of the chair to sit on it. The fixed part may have a rotation axis extending in a substantially vertical direction. The optional part may be rotatably attached to the chair so as to be displaceable between a storage position and a use position around the rotation axis. The storage position may be a position where the first optional part and the second optional part are stackable in a stacked state. The use position may be a position where a predetermined object can be held and where the optional part and the seat do not overlap in a substantially vertical direction.

[0019] With this configuration, the optional parts can be displaced to a storage position, making it possible to stack chairs with the optional parts attached, while the optional parts can be displaced to a usage position, improving the ease of taking in and out specified items.

[0020] One aspect of the present disclosure is an optional part that can be attached to a stackable chair. The optional part is capable of holding a predetermined object and is configured to allow the predetermined object to be inserted and removed along an axis extending generally in the vertical direction of the chair. The optional part also includes an upper part, a lower part, and a fixed part. The upper part has at least portions arranged opposite each other across the axis and forms an entrance for inserting and removing the predetermined object. The lower part is located below the upper part. The lower part is configured to cover at least one of the side and bottom surfaces of the predetermined object and to leave the front and rear sides of the lower region of the upper part open in the front-to-rear direction of the chair. The fixed part is configured to fix the upper and lower parts to the chair. A first optional part and a second optional part stacked above the first optional part are configured such that a portion of the upper part of the second optional part overlaps above the first optional part and the lower part of the second optional part overlaps in front of the first optional part. The first optional part and the second optional part are the optional parts. The ratio of the length dimension of the upper part in the approximately vertical direction to the length dimension of the optional part in the approximately vertical direction is 1 / 3 or less.

[0021] In this configuration, the second optional part can be stacked above and in front of the first optional part, so when an optional part is attached to a chair, the chair can be stacked with the optional part still attached. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a front view showing a chair set with optional parts in a use position or a storage position. [Figure 2] FIG. 10 is a plan view showing a chair set with optional parts in a use position or a storage position. [Figure 3] A left side view showing multiple chairs stacked together. [Figure 4]4A is an enlarged perspective view of the optional part attached to the chair in the storage position, as seen from the left front. FIG. 4B is an enlarged perspective view of the optional part attached to the chair in the use position, as seen from the left front. [Figure 5] FIG. 10 is an enlarged perspective view of the optional part attached to the chair in the storage position, seen from diagonally rear right. [Figure 6] FIG. 10 is an enlarged perspective view of the optional part attached to the chair in the use position, seen from diagonally rear right. [Figure 7] Figure 7A is a front view of the optional part. Figure 7B is a plan view of the optional part. Figure 7C is a bottom view of the optional part. Figure 7D is a right side view of the optional part. Figure 7E is a left side view of the optional part. Figure 7F is a rear view of the optional part. [Figure 8] FIG. 1 is a perspective view showing a state in which multiple chair sets are stacked. [Figure 9] FIG. 10 is a left side view showing a state in which a plurality of optional parts are stacked. [Figure 10] Fig. 10A is a side view showing a state in which a plurality of chair sets are stacked on a chair cart and the stacking height, and Fig. 10B is a diagram showing the loading space when chair sets are stacked on a chair cart. [Figure 11] FIG. 10 is an enlarged perspective view of the optional part of the first modified example in a storage position fixed to a chair, as viewed obliquely from the rear right. [Figure 12] FIG. 10 is an enlarged perspective view of the optional part of the first modified example in a use position fixed to a chair, as seen obliquely from the rear right. [Figure 13] FIG. 10 is a perspective view showing a state in which multiple chair sets equipped with optional parts of the first modified example are stacked. [Figure 14] FIG. 10 is a perspective view showing a chair set of a second modified example. [Figure 15] FIG. 15 is a perspective view showing a state in which a plurality of chair sets shown in FIG. 14 are stacked. [Figure 16] FIG. 10 is a perspective view showing a chair set of a third modified example. [Figure 17]FIG. 17 is a perspective view showing a state in which a plurality of chair sets shown in FIG. 16 are stacked. [Figure 18] FIG. 10 is a perspective view showing a chair set of a fourth modified example. [Figure 19] FIG. 19 is a perspective view showing a state in which a plurality of chair sets shown in FIG. 18 are stacked. [Figure 20] FIG. 10 is a perspective view showing a chair set of a fifth modified example. [Figure 21] FIG. 21 is a perspective view showing a state in which a plurality of chair sets shown in FIG. 20 are stacked. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Configuration] [1-1. Overall structure] The chair set 1 shown in Figures 1 and 2 includes a chair 2 and an optional part 3. Figures 1 and 2 show two chair sets 1 arranged side by side. In this embodiment, the chair set 1 further includes an optional attachment member 4. The optional part 3 is configured to be attachable to the chair 2 via the optional attachment member 4. As will be described in detail later, in this embodiment, the optional attachment member 4 is configured to be detachable from the chair 2. In the following explanation, the up-down direction, front-back direction, and left-right direction are expressed based on a user seated normally in the chair 2.

[0024] [1-2. Chair] As shown in FIGS. 1 and 2, the chair 2 includes a right leg 10, a left leg 20, a connecting rod 30, a seat 40, and a backrest 50.

[0025] The right leg 10 and the left leg 20 are formed by bending and welding tubular metal pipes, and are supports that support the seat 40 and the backrest 50. The right leg 10 is located below the seat 40 on the right side and has a right front pillar 11, a right rear pillar 12, and a right lower pillar 13. The right front pillar 11 is located in the front of the right leg 10 and extends vertically. The right rear pillar 12 is located in the rear of the right leg 10 and extends vertically. The right lower pillar 13 is located below the right leg 10 and connects the lower ends of the right front pillar 11 and the right rear pillar 12, and is located along the floor on which the chair 2 is placed.

[0026] The left leg 20 is located below and to the left of the seat 40 and has a front-left pillar 21, a rear-left pillar 22, and a lower-left pillar 23. The front-left pillar 21 is located at the front of the left leg 20 and extends vertically. The rear-left pillar 22 is located at the rear of the left leg 20 and extends vertically. The lower-left pillar 23 is located at the bottom of the left leg 20 and connects the lower ends of the front-left pillar 21 and the rear-left pillar 22, and is disposed along the floor surface on which the chair 2 is placed.

[0027] The connecting rod 30 is a tubular metal pipe that extends in the left-right direction from the right front pillar 11 or the left front pillar 21 of the chair 2, and connects the right front pillar 11 and the left front pillar 21 together. The seat portion 40 is substantially rectangular and is configured so that a user can sit on it. The backrest 50 is generally rectangular and is configured to be able to support the back of a seated user.

[0028] As shown in Figure 3, the chair 2 described above is configured to be stackable. Specifically, as shown in Figures 1 and 2, the right leg 10 and left leg 20 of the chair 2 spread outward as they go downward, and the distance between them is wider in the left-right direction on the rear pillars 12, 22 side than on the front pillars 11, 21 side. This makes it possible to stack chairs 2 of the same shape.

[0029] Stacking here refers to multiple chairs 2 of the same shape being piled up at intervals smaller than the height and width of the chair 2. Specifically, one chair 2 is stacked above another chair 2 so that the seat 40 and backrest 50 of the other chair 2 overlap above the seat 40 and in front of the backrest 50 of the other chair 2. Hereinafter, the state in which another chair 2 is stacked above a chair 2 will be referred to as a stacked state. For ease of explanation, the multiple stacked chairs 2 will be referred to as the first chair 2, the second chair 2, and so on, using the same reference numerals, from bottom to top.

[0030] [1-3. Optional parts] As shown in Figures 1, 2, 4A, and 4B, in this embodiment, the optional part 3 is attached to the right front pillar 11 and connecting rod 30 of the chair 2 via the optional attachment member 4. The optional part 3 is attached to the chair 2 so as to be rotatable about a rotation axis B that extends in a substantially vertical direction and that is provided on a fixing part 33 (described later). Note that the substantially vertical direction includes the vertical direction and a direction slightly tilted from the vertical direction. Specifically, the optional part 3 rotates relative to the optional attachment member 4 attached to the chair 2 so as to be displaced between a storage position shown by the solid line in Figure 4A and a use position shown by the dotted line in Figure 4A and in Figure 4B.

[0031] The storage position is a position where, in a stacked state, the optional part 3 fixed to the first chair 2 and the optional part 3 fixed to the second chair 2 can be stacked. Hereinafter, for ease of explanation, the stacked optional parts 3 will be referred to as the first optional part 3, the second optional part 3, and so on, using the same reference numerals, from bottom to top.

[0032] The optional part 3 is configured to be able to hold a predetermined object 5 shown in Fig. 4B. In this embodiment, the optional part 3 is a cup holder that holds a beverage such as a cup or a plastic bottle, which is an example of the predetermined object 5. The above-mentioned use position is a position where the optional part 3 can hold the predetermined object 5.

[0033] In this embodiment, the optional part 3 in the storage position is located in the front area and below the seat 40 of the chair 2 so that a portion of the optional part 3 substantially overlaps the seat 40 in the vertical direction. The optional part 3 in the use position is located in the front area of ​​the right front pillar 11 of the chair 2 so that it does not substantially overlap the seat 40 of the chair 2 in the vertical direction and does not interfere with a chair 2 of another chair set 1 that is placed next to it.

[0034] As shown in Figures 5 and 6, the optional part 3 has an axis A that extends substantially in the vertical direction. The optional part 3 shown in Figure 5 is in the storage position, and the optional part 3 shown in Figure 6 is in the use position. The optional part 3 is configured to allow a predetermined object 5 to be inserted and removed along the axis A. As shown in Figures 4A to 7F, the optional part 3 includes an upper part 31, a lower part 32, and a fixing part 33. The optional part 3 shown in Figures 7A to 7F is in the storage position.

[0035] The upper portion 31 is plate-shaped and has an annular shape extending in the circumferential direction around the axis A. As an example, the upper portion 31 is substantially cylindrical, and the cross section perpendicular to the axis A is substantially circular. In this embodiment, the axis A is a central axis passing through the center of the upper portion 31. The upper portion 31 opens substantially in the vertical direction, forming an entrance for putting in and taking out a predetermined object 5.

[0036] The lower part 32 is located below the upper part 31. The lower part 32 covers part of the side and bottom of the predetermined object 5, and is configured so that the front and rear sides of the lower region S of the upper part 31 shown in Figures 7D and 7E are open when the optional part 3 is in the storage position. In this embodiment, the lower part 32 has a bottom part 321 and two side parts 322.

[0037] The bottom portion 321 is plate-shaped and is located below the upper portion 31 with a gap therebetween. When viewed from above, the bottom portion 321 extends in a direction perpendicular to the axis A so as to cover a partial area of ​​the opening of the upper portion 31. Specifically, when the optional part 3 is in the storage position, the bottom portion 321 extends in the left-right direction and does not cover the areas in front and behind the opening of the upper portion 31 when viewed from above. The bottom portion 321 supports the bottom surface of a predetermined object 5.

[0038] The bottom 321 has a main body 323 and an extension 324. The main body 323 extends in the left-right direction when the optional component 3 is in the storage position, and is a generally rectangular shape with long sides extending in the left-right direction and short sides extending in the front-rear direction when viewed from above. The extension 324 is flush with the main body 323 and extends rearward from the main body 323. The extension 324 is formed so that the left-right width of the extending tip is narrower than the left-right width of the main body 323. In this embodiment, the extension 324 is generally trapezoidal in shape and extends from the rear end of the main body 323 so that its left-right width gradually narrows toward the rear.

[0039] Each side portion 322 is plate-shaped, extends upward from each left-right end of the main body 323 of the bottom portion 321, and connects to the upper portion 31. That is, each side portion 322 connects the upper portion 31 and the bottom portion 321. The two side portions 322 face each other across the axis A and are aligned in the left-right direction when the optional part 3 is in the storage position.

[0040] 7A and 7F, the lower portion 32 is formed in a substantially U-shape when viewed from the front-to-rear direction. Furthermore, as shown in FIGS. 7D and 7E, the upper portion 31 and the lower portion 32 are arranged in a substantially T-shape when viewed from the left-to-right direction. As a result, the right side, left side, and part of the lower side of the lower region S of the upper portion 31 are covered by the lower portion 32, and the front side and rear side are open.

[0041] The fixing portion 33 is a portion for fixing the upper portion 31 and the lower portion 32 to the chair 2. In this embodiment, the fixing portion 33 extends substantially perpendicularly to the outer surface of the side portion 322 from the side portion 322 located on the right side when the optional component 3 is in the storage position and from a part of the upper portion 31 above the side portion 322, and the extending tip portion is fixed to the option mounting member 4. Then, when the option mounting member 4 is attached to the chair 2, the upper portion 31 and the lower portion 32 are fixed to the chair 2 by the fixing portion 33.

[0042] In this embodiment, the fixed portion 33 has the rotation axis B as described above. The fixed portion 33 is fixed to the option mounting member 4 from below using, for example, an axle pin. The axle pin penetrates the fixed portion 33 in a substantially vertical direction and is inserted into the option mounting member 4, and functions as the rotation axis B. As a result, the fixed portion 33 is fixed to the option mounting member 4 so as to be rotatable around the rotation axis B.

[0043] [1-4. Optional mounting parts] The option mounting member 4 is a member for mounting the option part 3 to the chair 2. As shown in FIGS. 5 to 7F, the option mounting member 4 includes a first holding portion 41, a second holding portion 42, a connecting portion 43, and a locking portion 44.

[0044] The first holding portion 41 and the second holding portion 42 are portions for holding the chair 2. In this embodiment, the first retaining portion 41 is capable of holding the right front pillar 11 of the chair 2. The first retaining portion 41 is a plate-like member extending generally vertically, and its cross section perpendicular to the vertical direction is generally U-shaped. In other words, the first retaining portion 41 covers part of the outer surface of the right front pillar 11 and has an open rear end that allows the right front pillar 11 to pass through. Specifically, the first retaining portion 41 holds the right front pillar 11 so that it faces the outer surface of the right front pillar 11 from the front, left, and right. The gap between the inner surfaces of the left and right walls that make up the first retaining portion 41 is approximately the same length as the outer diameter of the right front pillar 11, or slightly larger than the outer diameter of the right front pillar 11. In other words, the first retaining portion 41 is shaped so that the right front pillar 11 fits snugly inside, or can be inserted with some play.

[0045] In this embodiment, the second holding portion 42 can hold the connecting rod 30 of the chair 2. The second holding portion 42 is located above and to the left of the first holding portion 41. The second holding portion 42 is plate-shaped and extends in the left-right direction, and its cross section perpendicular to the left-right direction is formed in a substantially U-shape. In other words, the second holding portion 42 covers a portion of the outer circumferential surface of the connecting rod 30 and has an open shape at the bottom to allow the connecting rod 30 to pass through. Specifically, the second holding portion 42 holds the connecting rod 30 so as to face the outer circumferential surface of the connecting rod 30 from the front, above, and rear. In other words, the second holding portion 42 is formed to hook onto the connecting rod 30. The distance between the inner surface of the front wall and the inner surface of the rear wall that constitute the second holding portion 42 is approximately the same length as the outer diameter of the connecting rod 30 or slightly larger than the outer diameter of the connecting rod 30. That is, the second holding portion 42 is formed so that the connecting rod 30 fits snugly therein, or so that the connecting rod 30 can be inserted therein with some play.

[0046] The connecting portion 43 is a portion that connects the first holding portion 41 and the second holding portion 42. In this embodiment, each of the retaining portions 41, 42 is fixed to the rear surface of the connecting portion 43, for example, by a bolt or the like. The connecting portion 43 has a thickness in the front-to-rear direction and is configured so that an axle pin or the like that functions as the rotation axis B of the fixing portion 33 of the optional component 3 can be inserted in a substantially vertical direction. In other words, the connecting portion 43 of the option mounting member 4 also serves to fix the fixing portion 33 so that it can rotate around the rotation axis B. In the connecting portion 43, the first holding portion 41 is disposed on the right side, the second holding portion 42 is disposed on the upper side, and the fixing portion 33 is disposed on the lower left side. In this embodiment, the lower left portion of the connecting portion 43 is notched in a substantially rectangular shape, and the fixing portion 33 is disposed in the notched portion.

[0047] In this embodiment, the locking portion 44 is configured to lock the positions of the first holding portion 41 relative to the right front pillar 11 and the second holding portion 42 relative to the connecting rod 30, as well as the position of the optional component 3 in the use position. The locking portion 44 has a first portion 443 extending from a first end 441 to a second end 442 and a second portion 444 extending forward from the first end 441, and is formed in a generally L-shape. The locking portion 44 is fixed at a generally central portion of the first portion 443 to the rear surface of the connecting portion 43 using a pivot pin 445 so as to be positioned between the first holding portion 41 and the fixing portion 33 of the optional component 3 when viewed from the rear. The pivot pin 445 functions as a rotation axis extending in the front-rear direction. The locking portion 44 is rotatable about the pivot pin 445 between an unlocked position shown in FIG. 5 and a locked position shown in FIG. 6.

[0048] The unlocked position is the position of the locking part 44 when the optional part 3 is placed in the storage position, and is a position where the first part 443 extends in the vertical direction and the second part 444 is placed below the connecting part 43 with a gap therebetween. The locked position is the position of the locking part 44 when the optional part 3 is placed in the use position, and is a position where the first part 443 extends in the horizontal direction and the second part 444 is placed on the left side of the connecting part 43 with the fixing part 33 of the optional part 3 sandwiched therebetween.

[0049] When the locking portion 44 is in the locked position, the second end 442 of the first portion 443 can close the rear opening of the first holding portion 41, and the second portion 444 can fix the position of the optional component 3 in the use position. Specifically, when the locking portion 44 is in the locked position, the locking portion 44, the first holding portion 41, and the second holding portion 42 can sandwich the right front pillar 11 and the connecting rod 30 from the front and rear directions. This fixes the position of the optional mounting member 4 relative to the chair 2. Furthermore, when the locking portion 44 is in the locked position, the fixing portion 33 of the optional component 3 in the use position can be sandwiched from the left and right directions between the second portion 444 and a part of the connecting portion 43. This fixes the position of the optional component 3 relative to the optional mounting member 4 (i.e., the chair 2).

[0050] [2. How to attach optional mounting parts to the chair] Next, a procedure for attaching the option mounting member 4 to the chair 2, to which the option part 3 is fixed, will be described with reference to FIGS. 4A to 6. FIG.

[0051] First, the second holding part 42 is positioned behind the connecting rod 30, and the connecting rod 30 is passed through the open part of the second holding part 42 so that the upper wall of the second holding part 42 abuts against the connecting rod 30, thereby attaching the second holding part 42 to the connecting rod 30. At this time, the optional part 3 is in the stored position, the locking part 44 is in the unlocked position, and the first holding part 41 is positioned approximately in front of the right front pillar 11.

[0052] Next, rotate the option mounting member 4 downward around the connecting rod 30, and pass the right front pillar 11 through the open part of the first holding part 41 so that the front wall of the first holding part 41 abuts against the right front pillar 11, thereby attaching the first holding part 41 to the right front pillar 11. As a result, the option mounting member 4 with the optional part 3 fixed thereto is attached to the chair 2 in the state shown in Figures 4A and 5.

[0053] Next, as shown in FIG. 4A, the optional component 3 is shifted from the storage position to the use position. Then, as shown in FIG. 6, the locking portion 44 is shifted from the unlocked position to the locked position. This causes the first end 441 of the locking portion 44 to abut against the right front column 11 from behind. At this time, the front walls of the first retaining portion 41 and the second retaining portion 42 abut against the right front column 11 and the connecting rod 30 from the front. As a result, the right front column 11 and the connecting rod 30 are sandwiched between the first retaining portion 41, the second retaining portion 42, and the locking portion 44, restricting movement of the optional mounting member 4 relative to the right front column 11 and the connecting rod 30 in the front-to-back, up-down, and left-to-right directions.

[0054] Additionally, the second portion 444 of the locking portion 44 abuts against the fixing portion 33 of the optional part 3 from the left side. As a result, the fixing portion 33 of the optional part 3 is sandwiched from the left and right between the second portion 444 and a part of the connecting portion 43, restricting movement of the optional part 3 in the rotational direction around the rotation axis B. In this way, the optional part 3 in the use position is fixed to the chair 2 via the option mounting member 4.

[0055] To remove the option mounting member 4 with the optional part 3 fixed thereto from the chair 2, simply reverse the above steps. Specifically, the locking part 44 is shifted from the locked position to the unlocked position. Next, the optional part 3 is shifted from the use position to the storage position. Next, the option mounting member 4 is rotated upward around the connecting rod 30 to remove the first holding part 41 from the right front column 11. Finally, the second holding part 42 is moved rearward to remove it from the connecting rod 30. In this way, the removal of the option mounting member 4 from the chair 2 is completed.

[0056] [3. Stacking chair sets] Next, stacking of the chair set 1 will be described with reference to FIGS. As shown in Fig. 8, the chair set 1 described above is configured to be stackable when the optional parts 3 attached to the chairs 2 via the option attachment members 4 are in the storage position. In other words, the chairs 2 can be stacked while the optional parts 3 remain attached to the chairs 2 via the option attachment members 4. Fig. 9 does not show stacked chairs 2, but shows an example of a stacked state in which the first to third optional parts 3 are stacked. Fig. 3 also shows a state in which the first to third chairs 2 are stacked individually.

[0057] In a stacked state in which the second chair 2 is stacked above the first chair 2, the first optional part 3 fixed to the first chair 2 and the second optional part 3 fixed to the second chair 2 are stacked in the state described below. When the first optional part 3 and the second optional part 3 are in the storage position, a part of the upper part 31 of the second optional part 3 overlaps above the first optional part 3, and the lower part 32 of the second optional part 3 overlaps in front of the first optional part 3. In this embodiment, when in the stacked state, the first optional part 3 and the second optional part 3 also overlap such that the part of the upper part 31 of the first optional part 3 that is forward of the side parts 322 is inserted between the two side parts 322 of the second optional part 3. The third chair 2 and the third optional part 3, and any chairs 2 and optional parts 3 that overlap thereafter, are stacked in the same manner.

[0058] In this embodiment, in the stacked state, the first chair pitch WA1 and the first optional pitch WA2 are approximately the same value. Also, in the stacked state, the second chair pitch WB1 and the second optional pitch WB2 are approximately the same value.

[0059] The first chair pitch WA1 is the pitch when the chairs 2 are stacked individually, and is the pitch in the approximately vertical direction between the seat 40 of the first chair 2 and the seat 40 of the second chair 2 when they are stacked. As shown in FIG. 3, the first chair pitch WA1 is, for example, the pitch in the approximately vertical direction between the top surfaces of the seats 40 of the chairs 2 when they are stacked. The second chair pitch WB1 is the pitch when the chairs 2 are stacked individually, and is the pitch in the front-to-back direction between the seat 40 of the first chair 2 and the seat 40 of the second chair 2 when they are stacked. As shown in FIG. 3, the second chair pitch WB1 is, for example, the pitch in the front-to-back direction between the front ends of the seats 40 of the chairs 2 when they are stacked.

[0060] The first optional pitch WA2 is the pitch in the approximately vertical direction between the bottom 321 of the first optional part 3 and the bottom 321 of the second optional part 3 in the stacked state. As shown in Fig. 9, the first optional pitch WA2 is, for example, the pitch in the approximately vertical direction between the lower surfaces of the bottoms 321 of the optional parts 3 in the stacked state. Furthermore, the second optional pitch WB2 is the pitch in the front-to-rear direction between the bottoms 321 of the first optional part 3 and the bottoms 321 of the second optional part 3 in the stacked state. As shown in Fig. 9, the second optional pitch WB2 is, for example, the pitch in the front-to-rear direction between the front ends of the bottoms 321 of the optional parts 3 in the stacked state.

[0061] This allows the chairs 2 with the optional parts 3 attached to be stacked at a height and width that are the same as the vertical height and front-to-back width when the chairs 2 without the optional parts 3 attached are stacked individually.

[0062] In this embodiment, the optional parts 3 are configured to satisfy the conditions described below so that the chair set 1 can be stacked as described above. 9, the upper part 31 of the optional part 3 is configured such that the width WA3 in the approximately vertical direction is less than the first chair pitch WA1. Furthermore, the side part 322 of the optional part 3 is configured such that the width WB3 in the front-to-rear direction in the overlapping region is less than the second chair pitch WB1. The overlapping region is a region of the side part 322 that is configured to overlap in front of the upper part 31 in the approximately vertical direction of the side part 322 in the stacked state.

[0063] In addition, the extension portion 324 of the bottom 321 of the optional part 3 is configured to extend to a position where its tip does not intersect with the plane P1 connecting the lower edges of the front ends of the upper parts 31 of the first optional part 3 and the second optional part 3 in the stacked state.

[0064] Furthermore, it is preferable that the ratio of the length dimension of the upper portion 31 in the approximately vertical direction to the length dimension of the optional part 3 in the approximately vertical direction is 1 / 3 or less. As shown in Fig. 10A, the chair set 1 can be stacked and stored above the chair cart 6 used to stack and store the chairs 2. As described above, when the optional parts 3 are in the storage position, the chair set 1 can be stacked at a height and width that are the same as the vertical height and front-to-back width when a single chair 2 without the optional parts 3 attached is stacked. Therefore, the chair set 1 can be stacked and stored on the chair cart 6 with the same loading space and loading height as the loading space and loading height shown in Fig. 10B when a single chair 2 is stacked on the chair cart 6.

[0065] [4. Effects] According to the embodiment described above in detail, the following effects can be obtained. (4a) In this embodiment, the first optional part 3 and the second optional part 3 in the storage position are configured so that, in the stacked state, a portion of the upper portion 31 of the second optional part 3 overlaps above the first optional part 3, and the lower portion 32 of the second optional part 3 overlaps in front of the first optional part 3. As a result, when the second chair 2 is stacked above the first chair 2, the second optional part 3 is also stacked above and in front of the first optional part 3. This allows the chairs 2 to be stacked with the optional parts 3 attached to them. As a result, the optional parts 3 do not need to be removed when stacking and storing the chairs 2, thereby reducing the effort and time required to remove the optional parts 3.

[0066] (4b) In this embodiment, the lower portion 32 has the bottom portion 321 and the side portions 322, and the bottom surface and side surfaces of the predetermined object 5 are supported by the bottom portion 321 and the side portions 322. Therefore, the predetermined object 5 can be held more stably than in a configuration in which the lower portion has only the bottom portion or the side portions.

[0067] (4c) In this embodiment, the optional part 3 is configured such that the width WA3 of the upper part 31 in the approximately vertical direction is less than the first chair pitch WA1, and the width WB3 of the overlapping area of ​​the side parts 322 in the front-to-back direction is less than the second chair pitch WB1. Therefore, chairs 2 with optional parts 3 attached can be stacked at the same height and width as the vertical height and front-to-back width when chairs 2 without optional parts 3 attached are stacked individually. In other words, the impact of optional parts 3 on the stacking of chairs 2 can be suppressed.

[0068] (4d) In this embodiment, the bottom 321 of the optional part 3 has a main body 323 and an extension 324. The extension 324 is configured so that its tip extends to a position where it does not intersect with the plane P1. This makes it possible to increase the area of ​​the bottom 321 for supporting the bottom surface of the specified object 5 while suppressing the effect on stacking of the first optional part 3 and the second optional part 3 when the first chair 2 and the second chair 2 are stacked.

[0069] (4e) In this embodiment, the optional part 3 in the storage position is located in the front area and below the seat 40 of the chair 2, so that a portion of the optional part 3 overlaps the seat 40 in the approximately vertical direction. Therefore, in the stacked state, the first optional part 3 attached to the first chair 2 is easily stored in the area below the seat 40 of the second chair 2 located above. In other words, in the stacked state, the optional part 3 is less likely to protrude into the area outside the chair 2. Therefore, when the chair set 1 is stacked and stored on the chair cart 6, it is possible to prevent the loading dimensions from becoming too large.

[0070] (4f) In this embodiment, the optional part 3 is configured to be rotatable around the rotation axis B of the fixing part 33 relative to the option mounting member 4 attached to the chair 2 so as to be displaceable between a storage position and a use position. The optional part 3 in the use position is located in the front region of the right front pillar 11 of the chair 2 so as not to overlap the seat 40 of the chair 2 in the vertical direction. Therefore, the optional part 3 can be displaced to the storage position to enable stacking of the chair 2 with the optional part 3 attached, while the optional part 3 can be displaced to the use position to improve the ease of taking in and out a predetermined item 5.

[0071] 5. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0072] (5a) In the above embodiment, the upper part 31 of the optional part 3 is generally cylindrical (i.e., annular), and the cross-sectional shape perpendicular to the axis A is generally circular. However, the shape of the upper part is not limited to this. For example, the upper part may be cylindrical, the cross-sectional shape perpendicular to the axis A being generally elliptical or generally polygonal.

[0073] Furthermore, for example, the upper portion may not be annular, but may be configured to partially cover the side surface of the predetermined object 5 in the circumferential direction, with portions arranged to face each other across the axis A. Specifically, the upper portion may have a shape that has a portion that is partially open in the circumferential direction, such as a substantially C-shape, or a shape in which two arc-shaped members are arranged to face each other.

[0074] (5b) In the above embodiment, the optional part 3 was a cup holder that holds a beverage such as a cup or a plastic bottle, which is an example of the predetermined object 5. However, for example, the optional part may be a small item holder that can store small items used around a chair, which is an example of the predetermined object.

[0075] (5c) In the above embodiment, the lower portion 32 has a bottom portion 321 and two side portions 322, and is configured to be substantially U-shaped when viewed from the front-to-rear direction. However, the configuration of the lower portion is not limited to this. For example, the lower portion may have a bottom portion and one side portion, and be configured to be substantially L-shaped when viewed from the front-to-rear direction. In this case, the side portion extends upward from either the left or right end of the bottom portion and connects to the upper portion.

[0076] Also, for example, the lower part may have only side parts extending downward from the upper part, i.e., no bottom part. Also, for example, the lower part may have only a bottom part, i.e., no side parts. When the lower part has only a bottom part, the upper part and the lower part may be connected by a fixing part.

[0077] (5d) In the above embodiment, the upper part 31, the bottom part 321, and the side parts 322 of the optional part 3 are plate-shaped. However, for example, the upper part, the bottom part, and the side parts may be rod-shaped or wire-shaped.

[0078] (5e) In the above embodiment, the upper portion 31 of the optional part 3 is configured such that the width WA3 in the vertical direction is less than the first chair pitch WA1 so that the first chair pitch WA1 and the first option pitch WA2 are approximately the same value in the stacked state. Also, the side portion 322 of the optional part 3 is configured such that the width WB3 in the front-to-back direction in the overlapping region is less than the second chair pitch WB1 so that the second chair pitch WB1 and the second option pitch WB2 are approximately the same value in the stacked state. However, the first option pitch WA2 and the second option pitch WB2 relative to the first chair pitch WA1 and the second chair pitch WB1 in the stacked state are not limited to this.

[0079] For example, in the stacked state, the upper part of the optional parts may be configured such that the width WA3 in the approximately vertical direction is approximately the same as or slightly larger than the first chair pitch WA1, so that only the first option pitch WA2 is slightly larger than the first chair pitch WA1. In this case, the vertical height is likely to be higher than when the chairs 2 are stacked alone, but the chairs 2 can be stacked with the optional parts attached to them.

[0080] Also, for example, in the stacked state, the side portions of the optional parts may be configured so that the width WB3 in the front-to-back direction in the overlapping area is approximately the same as or slightly larger than the second chair pitch WB1 so that only the second option pitch WB2 is slightly larger than the second chair pitch WB1. In this case, the width in the front-to-back direction is likely to be larger than when the chairs 2 are stacked alone, but the chairs 2 can be stacked with the optional parts attached to them.

[0081] Also, for example, in the stacked state, the first optional pitch WA2 may be slightly larger than the first chair pitch WA1, and the second optional pitch WB2 may be slightly larger than the second chair pitch WB1. That is, in the stacked state, the upper portion of the optional part may have a width WA3 in the approximately vertical direction that is approximately the same as or slightly larger than the first chair pitch WA1, and the side portion of the optional part may have a width WB3 in the front-to-back direction in the overlapping region that is approximately the same as or slightly larger than the second chair pitch WB1. Even in this case, the chair 2 can be stacked with the optional parts attached to it.

[0082] (5f) In the above embodiment, the bottom 321 has a main body 323 and an extending portion 324, and the extending portion 324 is generally trapezoidal. However, the shape of the extending portion is not limited to this. For example, the extending portion may have other shapes in which the width of the extending tip in the left-right direction is narrower than the width of the main body in the left-right direction, such as a generally triangular shape, a generally semicircular shape, or a rectangular shape whose overall width in the left-right direction is narrower than the width of the main body in the left-right direction. Also, for example, the bottom may have only a main body, i.e., no extending portion.

[0083] (5g) In the above embodiment, the optional part 3 in the storage position is located in the front and lower region of the seat 40 of the chair 2 so that a portion of the optional part 3 substantially overlaps the seat 40 in the vertical direction. However, the position of the optional part in the storage position is not limited to this. For example, the optional part in the storage position may be located in a position where it does not substantially overlap the entire seat 40 in the vertical direction, or may be located so that it substantially overlaps the entire seat 40 of the chair 2 in the vertical direction.

[0084] (5h) In the above embodiment, the optional part 3 was detachably attached to the chair 2 via a detachable optional attachment member 4. However, for example, as shown in FIGS. 11 and 12, the optional part 3 of a first modified example may be fixed to the chair 2 via a fixed optional attachment member 4a. The optional attachment member 4a may include a first holding portion 41, a second holding portion 42, a connecting portion 43, a locking portion 44a, and a rear wall portion 45. Note that the first holding portion 41, the second holding portion 42, and the connecting portion 43 have the same configuration as the optional attachment member 4 of the above embodiment, and therefore the same reference numerals are used and description thereof will be omitted.

[0085] The locking portion 44a is configured to lock the position of the optional component 3 in the use position. The locking portion 44a has a first portion 443a extending from a first end 441a to a second end 442a and a second portion 444a extending forward from the first end 441a, and is formed in a generally L-shape. The locking portion 44a is fixed to the rear surface of the connecting portion 43 by using a pivot pin 445a, near the second end 442a, so that the locking portion 44a is positioned between the first holding portion 41 and the fixing portion 33 of the optional component 3 when viewed from the rear. The pivot pin 445a functions as a rotation axis extending in the front-rear direction. The locking portion 44a is rotatable about the pivot pin 445a between an unlocked position shown in FIG. 11 and a locked position shown in FIG. 12. Similar to the locking portion 44 of the above embodiment, when the locking portion 44a is in the locked position, the second portion 444a can fix the position of the optional part 3 in the use position.

[0086] The rear wall 45 is a plate-like member that closes the rear opening of the first holding portion 41 and covers the area of ​​the rear surface of the connecting portion 43 above the second end 442a of the locking portion 44. Similar to the option mounting member 4 of the above embodiment, the rear wall 45 is fixed to the rear surface of the connecting portion 43 with bolts or the like after the second holding portion 42 is attached to the connecting rod 30 and the first holding portion 41 is attached to the right front pillar 11. This allows the rear wall 45, the first holding portion 41, and the second holding portion 42 to sandwich the right front pillar 11 and the connecting rod 30 from the front and rear directions, fixing the position of the option mounting member 4a relative to the chair 2. Therefore, the option component 3 of the first modified example is fixed to the chair 2 by the option mounting member 4a so that it cannot be easily removed.

[0087] In this way, when the fixed option mounting member 4a is used to fix the option part 3 to the chair 2, it is possible to prevent theft of the option part 3. Furthermore, as shown in Fig. 13, the chair set 1a including the chair 2, the option part 3, and the option mounting member 4a can also be stacked with the option part 3 attached to the chair 2, similar to the chair set 1 of the above embodiment.

[0088] (5i) In the above embodiment, the optional part 3 was rotatable relative to the option mounting member 4 attached to the chair 2 around the rotation axis B, which extends substantially in the vertical direction and is provided on the fixing part 33. However, the optional part may be fixed so that its position does not change relative to the chair 2.

[0089] For example, as shown in Fig. 14, a chair set 1b of a second modified example may include a chair 2, an optional part 3b, and an optional mounting member 4b. The optional part 3b may have a fixed part 33b that does not have a rotation axis and is fixed so that its position does not change relative to the optional mounting member 4b attached to the chair 2. The optional part 3b includes an upper part 31, a lower part 32, and a fixed part 33b. Note that the upper part 31 and the lower part 32 have the same configuration as the optional part 3 of the above embodiment, so the same reference numerals are used and a description thereof will be omitted.

[0090] The fixing portion 33b extends rearward from the upper portion 31, and the tip of the extending portion is fixed to the option mounting member 4b. When the option mounting member 4b is attached to the chair 2, the upper portion 31 and the lower portion 32 are fixed to the chair 2 by the fixing portion 33b.

[0091] Similar to the above-described option mounting member 4a, the option mounting member 4b includes, for example, a first holding portion 41, a second holding portion 42, a connecting portion 43, and a rear wall portion 45. The fixing portion 33b of the above-described option part 3b is fixed to the front surface of the connecting portion 43.

[0092] The optional part 3b is positioned in the front region and lower region of the seat 40 of the chair 2 so as not to overlap the seat 40 in the vertical direction. At this time, the optional part 3b is arranged so that the bottom 321 of the lower part 32 extends in the left-right direction. In other words, the optional part 3b is fixed to the chair 2 so as to be capable of holding a predetermined object 5 and to be stackable. For this reason, as shown in FIG. 15, a chair set 1b including the optional part 3b and the option mounting member 4b can also be stacked with the optional part 3b attached to the chair 2, similar to the chair sets 1 and 1a described above.

[0093] (5j) In the configurations of the above embodiment and the first and second modified examples, the optional parts 3, 3b are attached to the right front pillar 11 and the connecting rod 30 of the chair 2 via the optional attachment members 4, 4a, 4b. However, the positions at which the optional parts are attached to the chair 2 and the method of attaching the optional parts to the chair 2 are not limited to this.

[0094] For example, the optional part may be attached to the left front column 21 and the connecting rod 30 via an optional attachment member. When the optional attachment member holds the left front column 21 and the connecting rod 30, the optional attachment member is configured such that the first holding portion 41, locking portions 44, 44a, and optional parts 3, 3b are mirror images of the connecting portion 43 in the optional attachment members 4, 4a, 4b of the above embodiment and the first and second modified examples.

[0095] Also, for example, as shown in Figure 16, in the chair set 1c of the third modified example, the optional part 3c may be positioned in the rear and lower region of the seat 40 of the chair 2c so as not to overlap the seat 40 in the vertical direction, and may be directly fixed to the left leg 20 of the chair 2c.

[0096] Specifically, the chair set 1c includes a chair 2 and an optional part 3c. The optional part 3c includes an upper part 31, a lower part 32c, and a fixed part 33c. The lower part 32c has a bottom part 321c and one side part 322c, and is formed in a generally L-shape when viewed from the front-to-rear direction. The bottom part 321c is located below the upper part 31 with a gap therebetween and extends in the left-right direction. The side part 322c extends upward from the left end of the bottom part 321c and connects to the upper part 31. The fixed part 33c is located on the right side of the upper part 31 and extends forward from the upper part 31, with its extending tip fixed to the left rear column 22 of the left leg 20.

[0097] As described above, the optional part 3c is positioned in the rear and lower region of the seat 40 of the chair 2 so as not to overlap the seat 40 in the vertical direction. At this time, the optional part 3c is arranged so that the bottom 321c of the lower part 32c extends in the left-right direction. In other words, the optional part 3c is fixed to the chair 2 so as to be capable of holding a predetermined object 5 and to be stackable. For this reason, as shown in FIG. 17, the chair set 1c including the optional part 3c can also be stacked with the optional part 3c attached to the chair 2, similar to the chair sets 1, 1a, and 1b described above.

[0098] In the chair set 1c of the third modified example, the optional part 3c is fixed to the rear left pillar 22 of the left leg 20 of the chair 2c. However, for example, the optional part may be fixed to the rear right pillar 12 of the right leg 10 of the chair 2c. In this case, the optional part is configured such that the upper part 31 and the lower part 32c are mirror images of the fixed part 33c.

[0099] Also, for example, as shown in Figure 18, in the chair set 1d of the fourth modified example, the optional part 3c may be positioned in the rear and upper region of the seat 40 of the chair 2 so as not to overlap the seat 40 in the vertical direction, and may be fixed directly to the backrest 50 of the chair 2.

[0100] Specifically, the chair set 1d includes a chair 2 and an optional part 3c. The fixed part 33c of the optional part 3c has an extending tip portion fixed to the left end of the backrest 50.

[0101] As described above, the optional part 3c is positioned in the rear and upper region of the seat 40 of the chair 2 so as not to overlap the seat 40 in the vertical direction. At this time, the optional part 3c is arranged so that the bottom 321c of the lower part 32c extends in the left-right direction. In other words, the optional part 3c is fixed to the chair 2 so as to be capable of holding a predetermined object 5 and to be stackable. For this reason, as shown in FIG. 19, the chair set 1d including the optional part 3c is also stackable with the optional part 3c attached to the chair 2, similar to the chair sets 1, 1a to 1c described above.

[0102] In the chair set 1d of the fourth modified example, the optional part 3c is fixed to the left end of the backrest 50 of the chair 2. However, for example, the optional part may be fixed to the right end of the chair 2. In this case, the optional part is configured such that the upper part 31 and the lower part 32c are mirror images of the fixed part 33c.

[0103] Furthermore, for example, as shown in FIG. 20, in a chair set 1e of a fifth modified example, an optional part 3e may be provided directly on the tip of an armrest 60 (described later) that is provided on a chair 2e. Specifically, the chair set 1e includes a chair 2e and two optional parts 3e. Similar to the chair 2 described above, the chair 2e includes a right leg 10, a left leg 20, a connecting rod 30, a seat 40, and a backrest 50, as well as two armrests 60. The chair 2e is configured to be stackable.

[0104] Each armrest 60 is provided on the right leg 10 and the left leg 20, and is arranged in the left region above the seat 40 of the chair 2e and in the right region above the seat 40 so as not to overlap the seat 40 in the vertical direction. Each armrest 60 has a support part 61 and an armrest receiving part 62. Each support part 61 is provided so as to extend upward on the left rear column 22 of the left leg 20 and the right rear column 12 of the right leg 10. Each armrest receiving part 62 is provided at the upper end of each support part 61 so as to extend forward and expand in the horizontal direction.

[0105] Each optional part 3e is formed so that the upper part 31 is connected to the tip of each armrest support 62. That is, the part of the upper part 31 connected to each armrest support 62 functions as a fixing part. The optional part 3e is positioned at the tip of each armrest support 62 of the chair 2e so as not to overlap the seat 40 of the chair 2e in the vertical direction. At this time, the optional part 3e is arranged so that the bottom 321 of the lower part 32 extends in the horizontal direction. That is, the optional part 3e is attached to the chair 2e so that it can hold a predetermined object 5 and is stackable. Therefore, as shown in FIG. 21, a chair set 1e including the optional part 3e can also be stacked with the optional part 3e attached to the chair 2e, similar to the chair sets 1, 1a to 1d described above.

[0106] In the chair set 1e of the fifth modified example, the optional part 3e is provided on each armrest 60. However, for example, the optional part 3e may be provided on only one of the two armrests 60. In this case, the armrest 60 that does not have the optional part 3e may or may not be present.

[0107] (5k) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0108] [6. Technical Ideas Disclosed in the Present Specification] [Item 1] A chair set comprising stackable chairs and an optional part attached to the chairs and configured to be able to hold a predetermined object, The optional part is configured to allow the predetermined object to be taken in and out along an axis extending substantially in the vertical direction of the chair, The optional parts are: an upper portion having at least portions arranged to face each other across the axis and forming an entrance for inserting and removing the predetermined object; a lower portion located below the upper portion, the lower portion covering at least one of the side and bottom surfaces of the predetermined object, and configured such that the front and rear sides of the lower region of the upper portion in the front-to-rear direction of the chair are open; a fixing portion configured to fix the upper portion and the lower portion to the chair; In a stacked state in which a second chair is stacked above a first chair, a first optional part fixed to the first chair and a second optional part fixed to the second chair are configured such that a part of the upper part of the second optional part overlaps above the first optional part, and the lower part of the second optional part overlaps in front of the first optional part, the first chair and the second chair are the chairs, The chair set, wherein the first optional part and the second optional part are the optional parts.

[0109] [Item 2] The chair set according to item 1, The chair has a seat configured to allow a user of the chair to sit on it, A chair set in which the width of the upper portion in the approximately vertical direction is less than a first chair pitch in the approximately vertical direction between the seat of the first chair and the seat of the second chair in the stacked state.

[0110] [Item 3] The chair set according to item 2, The lower portion has a bottom portion extending in the left-right direction of the chair and configured to be able to support the bottom surface of the specified object, and a side portion extending upward from at least one end of the bottom portion in the left-right direction and connecting to the upper portion.

[0111] [Item 4] The chair set according to item 3, the side portion has an overlapping region in the substantially vertical region that is configured to overlap a front of the upper portion in the stacked state, A chair set, wherein the front-to-back width of the overlapping area of ​​the side portion is less than a second chair pitch in the front-to-back direction between the seat of the first chair and the seat of the second chair in the stacked state.

[0112] [Item 5] The chair set according to item 3 or 4, the bottom portion has a main body portion and an extension portion that extends on the same plane as the main body portion and extends rearward from the main body portion, The extension portion is configured so that the left-right width of at least the extended tip is narrower than the left-right width of the main body portion, and so that in the stacked state, the tip extends to a position where it does not intersect with a plane connecting the lower edges of the front ends of the upper portions of the first optional part and the second optional part.

[0113] [Item 6] A chair set according to any one of items 1 to 5, The chair has a seat configured to allow a user of the chair to sit on it, The optional part is arranged in a front region and a lower region of the seat so that at least a portion of the optional part overlaps with the seat in the approximately vertical direction.

[0114] [Item 7] A chair set according to any one of items 1 to 6, The chair has a seat configured to allow a user of the chair to sit on it, the fixed portion has a rotation axis extending in the substantially vertical direction, the optional part is attached to the chair rotatably about the rotation axis so as to be displaceable between a storage position and a use position, the storage position is a position where the first optional part and the second optional part can be stacked in the stacked state, The use position is a position where the specified object can be held and where the optional part and the seat do not overlap in the approximately vertical direction.

[0115] [Item 8] An optional part that can be attached to a stackable chair, The chair is configured to be capable of holding a predetermined object and to allow the predetermined object to be taken in and out along an axis extending in a substantially vertical direction of the chair, an upper portion having at least portions arranged to face each other across the axis and forming an entrance for inserting and removing the predetermined object; a lower portion located below the upper portion, the lower portion covering at least one of the side and bottom surfaces of the predetermined object, and configured such that the front and rear sides of the lower region of the upper portion in the front-to-rear direction of the chair are open; a fixing portion configured to fix the upper portion and the lower portion to the chair; Equipped with a first optional part and a second optional part stacked above the first optional part are configured such that a part of the upper portion of the second optional part overlaps above the first optional part, and such that a lower portion of the second optional part overlaps in front of the first optional part; the first optional part and the second optional part are optional parts, An optional part, wherein the ratio of the length dimension of the upper part in the approximately vertical direction to the length dimension of the optional part in the approximately vertical direction is 1 / 3 or less. [Explanation of symbols]

[0116] 1,1a~1e...chair set, 2,2e...chair, 3,3b,3c,3e...optional parts, 4,4a,4b...optional mounting parts, 5...predetermined items, 6...chair trolley, 10...right leg body, 11...right front column, 12...right rear column, 13...right lower column, 20...Left leg body, 21...Left front column, 22...Left rear column, 23...Left lower column, 30...Connecting rod, 31...Upper part, 32,32c...Lower part, 33,33b,33c...Fixing part, 40...Seat part, 41...First holding part, 42...Second holding part, 43...Connecting part, 44,4 4a...locking portion, 45...rear wall portion, 50...backrest, 60...armrest, 61...support portion, 62...armrest support portion, 321, 321c...bottom portion, 322, 322c...side portion, 323...main body portion, 324...extension portion, 441, 441a...first end portion, 442, 442a...second end portion, 445, 445a...axis pin, A...axis line, B...rotation axis, P1...plane, S...lower region, WA1...first chair pitch, WA2...first optional pitch, WB1...second chair pitch, WB2...second optional pitch.

Claims

1. A chair set comprising stackable chairs and an optional part attached to the chairs and configured to be able to hold a predetermined object, The optional part is configured to allow the predetermined object to be taken in and out along an axis extending substantially in the vertical direction of the chair, The optional parts are: an upper portion having at least portions arranged to face each other across the axis and forming an entrance for inserting and removing the predetermined object; a lower portion located below the upper portion, the lower portion covering at least one of the side and bottom surfaces of the predetermined object, and configured such that the front and rear sides of the lower region of the upper portion in the front-to-rear direction of the chair are open; a fixing portion configured to fix the upper portion and the lower portion to the chair; In a stacked state in which a second chair is stacked above a first chair, a first optional part fixed to the first chair and a second optional part fixed to the second chair are configured such that a part of the upper part of the second optional part overlaps above the first optional part, and the lower part of the second optional part overlaps in front of the first optional part, the first chair and the second chair are the chairs, The chair set, wherein the first optional part and the second optional part are the optional parts.

2. 2. The chair set of claim 1, The chair has a seat configured to allow a user of the chair to sit on it, A chair set in which the width of the upper portion in the approximately vertical direction is less than a first chair pitch in the approximately vertical direction between the seat of the first chair and the seat of the second chair in the stacked state.

3. 3. The chair set according to claim 2, The lower portion has a bottom portion extending in the left-right direction of the chair and configured to be able to support the bottom surface of the specified object, and a side portion extending upward from at least one end of the bottom portion in the left-right direction and connecting to the upper portion.

4. 4. The chair set according to claim 3, the side portion has an overlapping region in the substantially vertical region that is configured to overlap a front of the upper portion in the stacked state, A chair set, wherein the front-to-back width in the overlapping region of the side portion is less than a second chair pitch in the front-to-back direction between the seat of the first chair and the seat of the second chair in the stacked state.

5. A chair set according to claim 3 or claim 4, the bottom portion has a main body portion and an extension portion that extends on the same plane as the main body portion and extends rearward from the main body portion, The extension portion is configured so that the left-right width of at least the extended tip is narrower than the left-right width of the main body portion, and so that in the stacked state, the tip extends to a position where it does not intersect with a plane connecting the lower edges of the front ends of the upper portions of the first optional part and the second optional part.

6. A chair set according to any one of claims 1 to 4, The chair has a seat configured to allow a user of the chair to sit on it, The optional part is arranged in a front region and a lower region of the seat so that at least a portion of the optional part overlaps with the seat in the approximately vertical direction.

7. A chair set according to any one of claims 1 to 4, The chair has a seat configured to allow a user of the chair to sit on it, the fixed portion has a rotation axis extending in the substantially vertical direction, the optional part is attached to the chair rotatably about the rotation axis so as to be displaceable between a storage position and a use position, the storage position is a position where the first optional part and the second optional part can be stacked in the stacked state, The use position is a position where the specified object can be held and where the optional part and the seat do not overlap in the approximately vertical direction.

8. An optional part that can be attached to a stackable chair, The chair is configured to be capable of holding a predetermined object and to allow the predetermined object to be taken in and out along an axis extending in a substantially vertical direction of the chair, an upper portion having at least portions arranged to face each other across the axis and forming an entrance for inserting and removing the predetermined object; a lower portion located below the upper portion, the lower portion covering at least one of the side and bottom surfaces of the predetermined object, and configured such that the front and rear sides of the lower region of the upper portion in the front-to-rear direction of the chair are open; a fixing portion configured to fix the upper portion and the lower portion to the chair; Equipped with a first optional part and a second optional part stacked above the first optional part are configured such that a part of the upper portion of the second optional part overlaps above the first optional part, and such that a lower portion of the second optional part overlaps in front of the first optional part; the first optional part and the second optional part are optional parts, An optional part, wherein the ratio of the length dimension of the upper part in the approximately vertical direction to the length dimension of the optional part in the approximately vertical direction is 1 / 3 or less.

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