A foldable multipurpose bicycle comprising:
- a foldable main frame;
- a handlebar assembly mounted foldably on said main frame;
- a seat assembly having a saddle mounted removably on said main frame;
- a left pedal assembly mounted foldably on said main frame;
- a right pedal assembly mounted foldably on said main frame;
- a front wheel assembly having a front wheel of a standard diameter mounted removably on said main frame;
- a rear wheel assembly having a rear wheel of said standard diameter mounted removably on said main frame;
- a front brake assembly mounted on a front portion of said bicycle;
- a rear brake assembly mounted foldably on a rear portion of said bicycle;
- a float assembly mounted removably on said main frame;
- a propeller assembly mounted removably on said main frame, said propeller assembly being comprised of:
- a pipe structure including a vertical pipe, an upper horizontal pipe secured to and communicating with an upper end of said vertical pipe, and a lower horizontal pipe secured to and communicating with a lower end of said vertical pipe;
- a propeller having a horizontal rotating shaft journalled on an end of said lower horizontal pipe, and a plurality of propeller blades fixed on said rotating shaft;
- a drive shaft extending through said vertical pipe of said pipe structure;
- a wheel axle socket mounted rotatably within said upper horizontal pipe and adapted to be sleeved rigidly on a wheel axle;
- a first pair of interconnecting bevel gears respectively fixed on said drive shaft and said wheel axle socket for transferring rotation therebetween;
- a second pair of interconnecting bevel gears respectively fixed on said drive shaft and said rotating shaft of said propeller for transferring rotation therebetween;
- and
- a pair of generally parallel rudder cables adapted to be fixed separately on a steering column at an end thereof and fixed separately on said vertical pipe of said pipe structure at the other end thereof, said rudder cables being interdisposed with sufficient tension between said steering column and said vertical pipe of said pipe structure to enable said upper and lower horizontal pipes to rotate about said vertical pipe by rotating said handlebar assembly;
- whereby, said handlebar assembly can drive said lower horizontal pipe of said pipe structure and hence said rotating shaft of said propeller to rotate about said vertical pipe of said pipe structure while said left and right pedal assemblies can drive said propeller blades of said propeller to rotate;
- two quick-release lock mechanisms for locking releasably said front wheel and said rear wheel respectively on said main frame;
- and
- a wheel connecting rod assembly mounted removably on said bicycle for attaching said front and rear wheels rotatably to center of said main frame when said bicycle is folded;
- whereby, when said float assembly and propeller assembly are removed from said main frame, the remaining parts of said bicycle form a bicycle for riding on land;
- when said front and rear wheels are removed from said main frame, the remaining parts of said bicycle can be adjusted to form a hydro-bicycle for riding on smooth surfaced water, so that said propeller assembly propels said hydro-bicycle by rotating said left and right pedal assemblies and varies the advancing direction of said hydro-bicycle by rotating said handlebar assembly;
- when said bicycle is idle, said float assembly and propeller assembly may be removed from said main frame and the remaining parts of said bicycle are collapsible to form a wheel-like small unit.