Chair set and optional member

Abstract

A chair set formed to be stackable is provided. The chair set includes a chair and an optional member. The optional member is formed to allow a given object to be put in and taken out of it along an axis extending in a substantially up-down direction of the chair. The optional member includes an upper portion, a lower portion, and a fixing portion. In a stacked state in which a second chair is stacked on a first chair, a first optional member fixed to the first chair and a second optional member fixed to the second chair are stacked such that the upper portion of the second optional member partially overlaps above and with the first optional member and such that the lower portion of the second optional member overlaps with a front-side part of the first optional member.

What is claimed is: 
     
         1 . A chair set comprising: 
 a chair formed to be stackable; and   an optional member attached to the chair and capable of holding a given object,    the optional member allowing the given object to be put in and taken out of it along an axis extending in a substantially up-down direction of the chair,    the optional member including:    an upper portion including at least portions arranged to face each other with the axis therebetween, the upper portion forming an inlet/outlet through which the given object is put in and taken out;    a lower portion located below the upper portion, the lower portion being formed to cover at least one of a side surface or a bottom surface of the given object and also to be open at a front side and a rear side, in a front-rear direction of the chair, of a lower area below the upper portion; and   a fixing portion formed to fix the upper portion and the lower portion to the chair,    the chair being one of a first chair and a second chair,   the optional member being one of a first optional member and a second optional member, and   in a stacked state in which the second chair is stacked on the first chair, the first optional member fixed to the first chair and the second optional member fixed to the second chair being stacked such that the upper portion of the second optional member partially overlaps above and with the first optional member and such that the lower portion of the second optional member overlaps with a front-side part of the first optional member.   
     
     
         2 . The chair set according to  claim 1 , wherein 
       the chair includes a seat allowing a user of the chair to be seated thereon, and 
       a width of the upper portion in the substantially up-down direction is smaller than a first chair pitch, in the substantially up-down direction, between the seat of the first chair and the seat of the second chair in the stacked state. 
     
     
         3 . The chair set according to  claim 2 , wherein 
       the lower portion includes: 
 a bottom part extending in a left-right direction of the chair and being capable of supporting the bottom surface of the given object; and  
 a side part extending upward from at least one end, in the left-right direction, of the bottom part to be continuous with the upper portion. 
 
     
     
         4 . The chair set according to  claim 3 , wherein  
       the side part includes an overlapping area that overlaps with a front-side part of the upper portion of the optional member stacked immediately below, and 
       a width, in the front-rear direction, of the side part in the overlapping area is smaller than a second chair pitch, in the front-rear direction, between the seat of the first chair and the seat of the second chair in the stacked state. 
     
     
         5 . The chair set according to  claim 3 , wherein  
       the bottom part includes a body and an extension, the extension being coplanar with the body and extending rearward from the body, and 
       the extension is formed such that a width thereof, in the left-right direction, at at least its extending end is narrower than a width of the body in the left-right direction and such that the extension extends to a position where the extending end does not intersect with a plane connecting lower edges of front ends of the upper portions of the first optional member and the second optional member in the stacked state. 
     
     
         6 . The chair set according to  claim 1 , wherein 
       the chair includes a seat allowing a user of the chair to be seated thereon, and 
       the optional member is arranged in an area on a front-lower side of the seat so as to overlap at least partially with the seat in the substantially up-down direction. 
     
     
         7 . The chair set according to  claim 1 , wherein  
       the chair includes a seat allowing a user of the chair to be seated thereon,  
       the fixing portion includes a rotation axis extending in the substantially up-down direction,  
       the optional member is attached to the chair in a manner rotatable about the rotation axis so as to be moved between a storage position and a use position,  
       the storage position is a position in which, in the stacked state, the first optional member and the second optional member are stackable, and 
       the use position is a position in which the optional member is capable of holding the given object and in which the optional member and the seat do not overlap with each other in the substantially up-down direction. 
     
     
         8 . An optional member attachable to a chair formed to be stackable, the optional member being capable of holding a given object and allowing the given object to be put in and taken out of it along an axis extending in a substantially up-down direction of the chair, the optional member comprising: 
 an upper portion including at least portions arranged to face each other with the axis therebetween, the upper portion forming an inlet/outlet through which the given object is put in and taken out;    a lower portion located below the upper portion, the lower portion being formed to cover at least one of a side surface or a bottom surface of the given object and also to be open at a front side and a rear side, in a front-rear direction of the chair, of a lower area below the upper portion; and   a fixing portion formed to fix the upper portion and the lower portion to the chair,   the optional member being one of a first optional member and a second optional member,   the first optional member and the second optional member stacked on the first optional member being stacked such that the upper portion of the second optional member partially overlaps above and with the first optional member and such that the lower portion of the second optional member overlaps with a front-side part of the first optional member, and    a ratio of a dimension of the upper portion in the substantially up-down direction to a dimension of the optional member in the substantially up-down direction being 1/3 or less.