Chair

Abstract

A chair has a support structure, a backrest supported rotatably with respect to the support structure around a first axis extending in a widthwise direction of the support structure and displaceable to an inclined state inclined rearward from an initial state, a regulating part that regulates rotation around the first axis of the backrest, a return-part that returns the backrest in the inclined state to the initial state, a first-operation-member that allows a seated person to operate the regulating part, a second-operation-member that allows the seated person to operate the return-part, and a base-member that supports the first-operation-member and the second-operation-member, the base-member extends in the widthwise direction, the first-operation is supported by a first-support-part provided on one end side in the widthwise direction of the base-member, and the second-operation-member is supported by a second-support-part provided on other end side in the widthwise direction of the base-member.

1 . A chair comprising:
 a support structure;   a backrest that is supported rotatably with respect to the support structure around a first axis extending in a widthwise direction of the support structure and that is displaceable to an inclined state tilted rearward from an initial state;   a regulating part configured to regulate rotation of the backrest around the first axis;   a return part configured to return the backrest in the inclined state to the initial state;   a first operation member configured to allow a seated person to operate the regulating part;   a second operation member configured to allow the seated person to operate the return part; and   a base member configured to support the first operation member and the second operation member,   wherein the base member extends in the widthwise direction,   the first operation member is supported by a first support part provided on one end side of the base member in the widthwise direction, and   the second operation member is supported by a second support part provided on other end side of the base member in the widthwise direction.   
     
     
         2 . The chair according to  claim 1 , wherein the base member has a rod shape extending in the widthwise direction. 
     
     
         3 . The chair according to  claim 2 , wherein the base member is a shaft portion having a second axis extending in the widthwise direction, and
 the first operation member and the second operation member are coaxially disposed on the second axis.   
     
     
         4 . The chair according to  claim 3 , wherein the return part comprises:
 a spring configured to bias the backrest in the inclined state in a direction of returning to the initial state; and   an adjustment portion that is linked to the second operation member and that is configured to adjust a biasing force of the spring,   the base member is rotatable around the second axis,   the first operation member is rotatable around the second axis relative to the base member, and   the second operation member is fixed to the base member not to be rotatable around the second axis relative to the base member.   
     
     
         5 . The chair according to  claim 1 , wherein the regulating part and the return part are disposed with the base member sandwiched therebetween when seen in the widthwise direction. 
     
     
         6 . The chair according to  claim 5 , wherein the backrest has two sidewalls disposed at an interval in the widthwise direction,
 the first operation member is supported by the sidewall disposed on one side in the widthwise direction, and   the second operation member is supported by the sidewall disposed on other side in the widthwise direction.   
     
     
         7 . The chair according to  claim 1 , wherein the base member has an intermediate portion between the first support part and the second support part, and
 both end portions of the intermediate portion in the widthwise direction are supported by two flange portions provided on the chair.