| 摘要 |
Provided is a chair in which a biasing force that acts on a back can be greatly changed even if the stroke of a moving member is small, thereby enabling the whole device to be compact, and in which the biasing force that acts on the back can be adjusted steplessly and with a light force. A biasing force transmission member (41) reverses the biasing force of a biasing means that acts on a tip portion of the biasing force transmission member (41) which is a point of effort (Q) with with a point abutting a fulcrum member (49) working as a fulcrum (P) for a lever, transmits the biasing force to a base end of the biasing force transmission member (41) which is a point of load (R) in order to bias the back in a direction in which the back will be upright, and moves the fulcrum member (49) along a side edge of the biasing force transmission member (41) on a pressure receiving side in order to be able to adjust the biasing force that acts on the back. |
