< Topic >The wheelchair rises and the tilt slant face on the tilt slant face going back suddenly offers the back space prevention device of the prevention possibility, wheelchair the occasion where it advances immediately after the halting and the halt in the middle which advances.SolutionsAt the same time the hub itself in 11 and the hub itself rotary possibility desorption possibly the axis the spiral shellfish is adjusted the installation screw which is formed by the peripheral face in the inner skin of 12 which facilities is done and the hub itself, in order the pawl tooth ring 13 where the pawl tooth was formed to the inner skin and the pawl tooth and the stop gearwheel which gearing is done is formed, stops and from gearwheel possesses the check ring section which extending facilities is done in the same axis, for the crevice to be formed by axial direction in the peripheral face of the check ring section, the axis to become revolution possible the Inlaying it has with the hub component which possesses the stop gearwheel ring 14 which is put. Furthermore, in order that it is installed in the hub component, it possesses the aperture edge aperture on the side which opposes with the hub component, advance and retreat Interpolation facilities it is possibly done in the shell 22 which is installed in axis 12 and the crevice, in the shell 22 in the top and bottom it is provided in the pin 24 which facilities is done and the shell in order the frame to pass 25 which possesses the cord hole and the cord hole, having with the stop component which possesses the control cord 26 which, is concatenated to the pin it becomes.< Choice figure >Drawing 3【課題】車椅子が上り傾斜面を前進する途中で停止及び停止直後に前進する際に傾斜面上を急に後退することを防止可能な、車椅子の後退防止装置を提供する。【解決手段】ハブ本体11と、ハブ本体に回転可能且つ脱着可能に貫設された軸体12と、ハブ本体の内周面に螺合する装着ネジが外周面に形成され、つめ歯が内周面に形成されたつめ歯リング13と、つめ歯と噛合する止め歯が形成され、止め歯から同軸に延設された制限リング部を有し、制限リング部の外周面に軸方向に凹部が形成され、軸体が回転可能となるように嵌挿された止め歯リング14とを有するハブ部材とを備える。さらに、ハブ部材に取り付けられ、ハブ部材と対向する側に開口した開口端を有し、軸体12に装着されたシェル22と、凹部に進退
