To enhance variability of a set position in a longitudinal direction and in a height direction of a seat on which a rider is seated and enhance load bearing of a frame bearing the seat.SOLUTION: A bicycle frame structure comprises a rear tube 5 extending obliquely upward, from a vicinity of a place on which feet of a rider 100 are put toward a rear side, in which one end of a left U-shaped pipe material 151 and one end of a right U-shaped pipe material 152 are fixed at the same height to a middle between an upper end and a lower end of the rear tube 5; the other end of the left U-shaped pipe material 151 and the other end of the right U-shaped pipe material 152 are fitted to each other to constitute a seat support tube 15 in a nearly rectangle shape in a planar view supporting a placed seat 17; one end of a left support stay 161 and one end of a right support stay 162 are fixed at the same height to the rear tube 5; the other end of the left support stay 161 is fixed to a lower side of the left U-shaped pipe material 151; and the other end of the right support stay 162 is fixed to a lower side of the right U-shaped pipe material 152.SELECTED DRAWING: Figure 3
【課題】運転者が座るシートの前後方向と高さの設定位置の可変性を高めると共に、シートを支持するフレームの耐荷重性を高める。【解決手段】運転者100の足が配置される付近から後方に向かって斜め上向きに延びるリアチューブ5を有し、左コ字形パイプ材151の一端と右コ字形パイプ材152の一端とが同一高さでリアチューブ5の上端と下端の途中に固定され、左コ字形パイプ材151の他端と右コ字形パイプ材152の他端とが相互に嵌合されて、載置されるシート17を支持する平面視略矩形のシート支持チューブ15を構成し、左支持ステー161の一端と右支持ステー162の一端とが同一高さでリアチューブ5に固定されると共に、左支持ステー161の他端が左コ字形パイプ材151の下側に固定され、右支持ステー162の他端が右コ字形パイプ材152の下側に固定される自転車用フレーム構造。【選択図】図3
BICYCLE FRAME STRUCTURE AND MOTORIZED BICYCLE
自転車用フレーム構造及び原動機付自転車
2024-07-31
Patent
Electronic Resource
Japanese