Collapsible folding bicycle assembly

Claim 1

A folding bicycle comprising an elongated frame mechanism (14) extending in a front-to-rear direction at a slight downward angle; a front steering assembly comprising a front tube (5) having a pivotal connection (12) with the front end of said frame-mechanism, a post extending downwardly through said front tube, a wheel fork (3) attached to the lower end of said post, and two fold-down handle bars(7) swingably connected to the upper end of said post; a front ground wheel rotatably supported in said wheel fork, and a rear ground wheel rotatably supported at the rear end of the elongated frame mechanism; a seat assembly located substantially above the mid point of the frame mechanism, said seat assembly comprising a substantially vertical pipe (20) and a seat-support stem (18) extending within said pipe; an elongated reinforcement rod means (16) having one end thereof pivotably connected to the elongated frame mechanism (14) at a point near the frame mechanism front end, said reinforcement rod means extending upwardly and rearwardly, with its other end pivotably and detachably connected to said seat assembly pipe; an elongated arm means (15) having one end thereof pivotably connected to said front tube, said arm means extending rearwardly and downwardly, with its other end pivotably connected to said reinforcement rod means; an elongated support bar (21) having one end thereof affixed to said seat assembly pipe, said bar extending downwardly and rearwardly with the other end pivotably connected to the elongated frame mechanism at a point spaced rearwardly from the midpoint of the frame mechanism; said elongated frame mechanism comprising a sprocket shaft support means located in an upper edge area of the frame mechanism at a point substantially directly below the seat assembly pipe: said shaft support means comprising two hingely connected strut mechsnisms having pivot connections (at F and H) with longitudinally spaced portions of the frame mechanism; said frame mechanism including a hinge joint (at I) below said strut mechanisms; whereby, when the reinforcement rod means is detached from the seat assembly pipe the elongated frame mechanism can be folded at the aforementioned pivot connections and hinge joint so that the front end of the frame mechanism is brought relatively close to the rear end of the frame mechanism.