Patent ID: 9605796
Date: 2017-03-28
CPC Classifications: A47C,F16M,G01M

Claim:
1. A posture holding chair comprising: a base onto which a substance is placed; a supporting member which is attached onto the base so that the supporting member freely swings centering on a pivot between a standby state where the supporting member does not support the substance and an active state where the supporting member supports the substance in an inclination state, the supporting member being positioned on a side of the base; and a swinging support member having a returning force for returning the supporting member to the standby state when the supporting member is inclined; wherein the swinging support member is structured by a swinging member that is supported on an oscillating shaft so as to freely rotate with respect to the oscillating shaft and that swings in conjunction with the supporting member, a biasing member for applying a biasing force to the swinging member in a direction of return of the supporting member to the standby state, a liquid pressure output member for outputting a liquid pressure in response to a weight of the substance placed on the base, the liquid pressure output member being positioned under the base; a displacement amount adjusting member, with which a point of action of the biasing force applied from the biasing member to the supporting member is moved in response to a liquid pressure outputted from the liquid pressure output member such that a distance from the oscillating shaft of the swinging member to the point of action changes; and a connecting member that bridges between the swinging member and the supporting member, and synchronizes the swinging member and the supporting member; wherein the biasing member is connected to a lower side of the swinging member with respect to the oscillating shaft, a long hole lengthwise in a vertical direction is formed on an upper side of the swinging member with respect to the oscillating shaft, a connection shaft is located in the long hole, the connection member is connected with the connection shaft, the point of action is the connection shaft, a coil spring is wound around the oscillating shaft, a fixed end of the coil spring is fixed to the swinging member, and a working end of the coil spring abuts the connection shaft and biases the connection shaft in a direction away from the oscillating shaft.