Folding tandem bicycle

Claim 1

A tandem bicycle comprising: a frontal body portion having a front flywheel coupled to a handlebar by a head tube for positionally stabilizing a front wheel, a frontal portion upper tube and a frontal portion lower tube respectively coupled to said head tube, said frontal portion upper tube and said frontal portion lower tube of said frontal body portion each having a pair of frontal sockets coupled to a respective forked end section of said frontal portion upper and lower tubes; an intermediate body portion having a first pair of upright tubes extending in a vertical direction parallel each to the other, an intermediate upper tube having a front end connected to said first pair of upright tubes and a rear end terminating in an upper tube forked end section coupled to a pair of intermediate sockets, a seat tube to support a saddle, and an intermediate portion lower tube extending parallel to said intermediate upper tube having a front end connected to said first pair of upright tubes and a rear end terminating in a lower tube forked end section having a pair of rear intermediate sockets; a rear body portion having a second pair of upright tubes extending in said vertical direction parallel each to the other and connected to said intermediate upper and lower tubes, a rear seat tube to support a rear saddle, a rear flywheel fastened to positionally stabilize a rear wheel; connection means for connecting the pair of frontal sockets to said first pair of upright tubes and the rear intermediate sockets to said second pair of upright tubes, said connection means including a pair of connecting devices wherein each connecting device includes a locating ring fixedly fastened internal one upright tube at either end, a sleeve fastened internal a respective upright tube spaced below said locating ring, said sleeve having a longitudinal slot formed therethrough and a locating notch extending from said longitudinal slot at a bottom section of said slot, a spring positioned internal said sleeve and a lock bolt inserted in said sleeve supported on said spring for locking a socket between said locating ring and said sleeve, and a knob member inserted through said longitudinal slot and connected to said lock bolt, said lock bolt being supported by said spring in a locking position to lock the respective socket in position or movable from said locking position to an unlocking position for permitting the respective socket to be disconnected from the respective upright tube by displacing said knob member along said longitudinal slot and inserting said knob into said locating notch; frontal transmission means for rotationally displacing said front wheel, said frontal transmission means including a front sprocket driven by a first set of pedals to rotate said front flywheel and said front wheel through a cable, said front sprocket having a series of sprocket teeth formed within a peripheral edge thereof, said front flywheel having a series of flywheel teeth formed around and within a peripheral edge thereof, said cable having two opposite ends respectively coupled with a cylindrical end member, each of said cylindrical end members having a toothed groove formed within a respective peripheral wall for mating engagement with the sprocket teeth or said front flywheel for permitting said front flywheel and said front wheel to be rotated as said front sprocket is rotated by said first set of pedals; and, rear transmission means for rotationally displacing said rear wheel, said rear transmission means including a rear sprocket driven by a second set of pedals to rotate said rear flywheel and said rear wheel by a chain coupling.