Chair with armrest

Abstract

A chair with armrest includes a support base supported by a leg, a seat that is pivotally fixed to the support base using an axle extending in a left and right direction, the rear part of the seat being rotatable upward and downward, an impelling unit that is provided at the support base and impels the seat at the rear of the axle upward, and an armrest provided to the support base. When the rear part of the seat rotates upward or downward, the height of the armrest does not change, and therefore arms or the like are not squeezed between the top plate of a desk and the armrest.

1 . A chair with an armrest, comprising:
 a support base supported by a leg;   a seat that is pivotally fixed to the support base using an axle extending in a left and right direction, a rear part of the seat being rotatable upward and downward;   an impelling unit that is provided at the support base and impels the seat at the rear of the axle upward; and   an armrest in which a lower part is connected to the support base, and an upper part stands upward from an exterior side of the seat.   
     
     
         2 . The chair with an armrest according to  claim 1 , wherein
 the support base has a shape that is spread forward in planar view and is inclined in a front upward in side view, and   the armrest is connected to a lateral side in a front part of the support base.   
     
     
         3 . The chair with an armrest according to  claim 2 , wherein
 the seat is pivotally fixed to a front part positioned above a rear part of the support base, and   the armrest is connected to a portion behind the axle in the support base.   
     
     
         4 . The chair with armrest according to  claim 1 , wherein
 the armrest includes an armrest fulcrum that has an inward L shape in planar view, and an elbow pad member fixed to an upper end surface of the armrest fulcrum, and   the armrest fulcrum passes from the support base to a lower part of the seat and stands upward from an exterior side of the seat.   
     
     
         5 . The chair with an armrest according to  claim 1 , wherein
 fitting convex portions divided into two-pronged ends are provided to one of an attachment target portion of the chair that attaches the armrest positioned at a side of the seat and an attachment portion attached to the attachment target portion of the armrest,   fitting concave portions divided into two-pronged ends are provided to another one of the attachment target portion and the attachment portion,   a width between external surfaces in the fitting convex portions gradually decreases toward a tip of the fitting convex portions,   a width between internal surfaces in the fitting concave portions gradually decreases toward the inside of the fitting convex portions,   the pair of the fitting convex portions and a reentrant portion positioned between the pair of the fitting convex portions are fitted to the pair of the fitting concave portions and a protrusion positioned between the pair of the fitting concave portions, and   the attachment portion and the attachment target portion are fastened by a fastening unit from a fitting direction of the fitting convex portions and the fitting concave portions.   
     
     
         6 . The chair with an armrest according to  claim 5 , wherein the attachment target portion of the chair is provided at a portion where a width of a component, whose width increases toward a front or a rear in planar view, is increased. 
     
     
         7 . The chair with armrest according to  claim 5 , wherein
 a screw hole is provided from an apical surface of the protrusion positioned between the pair of the fitting concave portions toward a basal portion of the protrusion,   a screw through hole is provided on a bottom surface of the reentrant portion positioned between the pair of the fitting convex portions, and   a screw passing through the screw through hole is screwed to the screw hole, thereby fastening the attachment portion of the armrest to the attachment target portion of the chair.   
     
     
         8 . The chair with an armrest according to  claim 5 , wherein, a guard portion that comes into contact with a neighboring portion of the attachment target portion in the chair is provided around the attachment portion in the armrest.