Patent ID: 6827362
Filing Date: 2004-12-07
Classification: B62M

Abstract:
A two-wheel drive bicycle, comprising:a main frame, said main frame including a steering head, a seat tube, a cross bar and a hollow downtube, said cross bar having a first end and a second end, said first end of said cross bar being connected to said steering tube and said second end of said cross bar being connected to said seat tube, said hollow downtube having a first end and a second end, said first end of said hollow downtube being connected to said steering head; a main drive mechanism, said main drive mechanism including a housing, a driving spindle, at least one driven ring gear, a first driven shaft and a second driven shaft, said housing being connected to said main frame, said driving spindle being rotatably connected to said housing and slidingly engaged with said at least one driven ring gear, said first driven shaft being rotatably connected to said housing and selectively engaged with said at least one driven ring gear, and said second driven shaft being rotatably connected to said housing and selectively engaged with said at least one driven ring gear; a front fork, said front fork including a hollow fork tube having a first end and a second end, said first end of said hollow fork tube being pivotally connected to said steering head; a front wheel, said front wheel being rotatably connected to said front fork proximate said second end of said hollow fork tube; a rear frame, said rear frame including a seat stay and a hollow chain stay, said seat stay having a first end and a second end, said first end of said seat stay being connected to said seat tube, said hollow chain stay having a first end and a second end, said first end of said hollow chain stay being connected to said housing and said second end of said hollow chain stay being connected to said second end of said seat stay; a rear wheel, said rear wheel being rotatably connected to said rear frame proximate said second end of said chain stay; a front wheel drive mechanism, said front wheel drive mechanism including a first shaft means rotatably positioned inside of said hollow downtube and a second shaft means rotatably positioned inside said hollow fork tube, said first shaft means having a first end operably coupled to said first driven shaft and a second end, said second shaft means having a first end operably coupled to said second end of said first shaft means and a second end operably coupled to said front wheel; and a rear wheel drive mechanism, said rear wheel drive mechanism including a third shaft means rotatably positioned inside of said hollow chain stay, said third shaft means having a first end operably coupled to said second driven shaft and a second end operably coupled to said rear wheel.