Tip - Patent US5716065 - Tandem bicycle

A tandem bicycle which includes a bicycle and a rear cycle unit coupled to the seat tube of the bicycle by a coupling, the rear cycle unit including a top tube, a down tube, a bottom bracket, a seat tube, a saddle and post assembly, a seat stay and bottom fork assembly, a free wheel, a crank and pedal assembly, and a handlebar, wherein the top tube and down tube of the rear cycle unit are respectively comprised of two sections pivotably connected together and secured in the operative position by a lock pin so that the rear cycle unit can be collapsed when not in use; a disk is mounted on the crank and pedal assembly and turned by it; an adjustable damper is mounted on the seat tube and down tube of the rear cycle unit and controlled by an adjustment screw to give a damping force to the disk.