BICYCLE "MAXI" Russian patent published in 1995 - IPC

FIELD: biotransport, sports, tourist and road bicycles. SUBSTANCE: bicycle has front steerable wheel whose diameter is smaller than that of rear driving wheel with driving sprocket; it has also free-wheeling clutch, brake and chain tensioning mechanisms, bottom bracket-and-saddle unit installed on seat tube for free displacement along tube and separate locks to prevent turning of saddle pillar in tube and to set saddle in position corresponding to road profile. Each crank has base with extension lock. Extension can be moved to provide minimum length of crank within 220-200 mm and maximum length within 340-360 mm. Driving sprocket has more than 70 teeth and driven sprocket, mot more than 15. Diameter of driving wheel is not less than 710 mm, and that of steerable wheel is not less than 350 mm. Saddle pillar and bottom bracket unit guide are connected by flexible or rigid member which can be freely shifted along seat tube with oval cross section. Device can be used in bicycles, tricycle, velomobiles and mopeds. EFFECT: enlarged operating capabilities. 6 cl, 11 dwg