PROBLEM TO BE SOLVED: To provide a 6-wheeled chair having a caster support shaft for a rear wheel (an auxiliary wheel) which is retained in the vertical state even when getting over a step, so that the wheelchair is turned with a reduced force.SOLUTION: In the 6-wheeled chair, the front wheels and the rear wheels (auxiliary wheels) of which are each provided with a caster, the rear wheels (the auxiliary wheels) are connected to the rear part of the leg body through a link mechanism 10 and a spring 10-3 so that even if the leg bodies are inclined by lifting the front wheels, the rear wheels (the auxiliary wheels) 9 are always retained in the vertical state. The link mechanism includes two sets of links provided between the auxiliary wheel support member and the rear end part of the leg body and between the auxiliary wheel support member and a main wheel support member. The spring is stretched between the auxiliary wheel support member and the wheel support member of the leg body rear end part, and the leg body is inclined against the spring by the link mechanism so that the front wheel side is floated from the ground surface, and the casters of the auxiliary wheels fitted to the auxiliary wheel support member are always retained in the vertical state by the action of the link mechanism and the spring.COPYRIGHT: (C)2010,JPO&INPIT【課題】段差を乗り越える際でも後輪(補助車輪)のキャスター支軸が垂直な状態を保持し、車いすの方向転換を平坦な場所と同様に僅かな力で行うことができる6輪型車いすの提供。【解決手段】前輪および後輪(補助車輪)がキャスター付きの6輪型車いすにおいて、前輪を持ち上げることによって脚体が傾斜しても後輪(補助車輪)9が常に垂直状態を保持されるようにリンク機構10とスプリング10-3を介して該後輪(補助車輪)を脚体後部に接続する。リンク機構は、補助車輪支持部材と脚体の後端部との間、および補助車輪支持部材と脚体後端部との間に設けた2組のリンクで構成し、スプリングは補助車輪支持部材と脚体後端部の車輪支持部材との間に掛け、脚体が前記リンク機構により前記スプリングに抗して傾斜して前輪側が接地面より浮上し、補助車輪支持部材に取付けられた補助車輪のキャスターがリンク機構とスプリングの作用により常に垂直に保持される。【選択図】図1
