PROBLEM TO BE SOLVED: To provide a wheelchair which can be prevented from a backward movement by the action of a user by a simple structure when the user tries to sit on the wheel chair.SOLUTION: A wheelchair comprises a movable base plate 40 for changing a position into an ordinary position or a brakable position in accordance with a load at the instant when a user sits on a seating portion 4. A braking cam member 43 is rotatably mounted on the movable base plate 40 so that, when the user sits on the seating portion 4, the movable base plate 40 takes an ordinary position and the braking cam member 43 leaves a main wheel 2, whereas, when the user leaves the seating portion 4, the movable base plate 40 takes the brakable position and a body portion 43A of the braking cam member 43 comes into forced contact with an outer circumference of the main wheel 2, and when the main wheel 2 begins to rotate backward, a protrusion 43B of the braking cam member 43 comes into forced contact with the outer circumference of the main wheel 2 and the main wheel 2 is braked.COPYRIGHT: (C)2014,JPO&INPIT【課題】簡易な構造で、使用者が着座等しようとする際に、使用者の動作によって後方へ動いてしまうことを確実に防止することができる車いすを提供する。【解決手段】使用者が着座部4に着座した際の荷重に従って、通常位置又は制動可能位置に位置変換する可動ベース板40を備え、該可動ベース板40には、制動用カム部材43が回動自在に取り付けられており、使用者が着座部4に着座したときは、該可動ベース板40が通常位置となって該制動用カム部材43が主車輪2と離開し、一方、使用者が着座部4から離れたときは、該可動ベース板40が制動可能位置となり、該制動用カム部材43の本体部43Aが該主車輪2の外周面に圧接し、さらに該主車輪2が後方へ回り始めると、該制動用カム部材43の突出部43Bが該主車輪2の外周面に圧接し、該主車輪2が制動される。【選択図】図5
