A folding recumbent bicycle wherein a bicycle of recumbent design includes a three-section main frame which folds at two hinged locations; a steering bar which folds at a hinged location and handlegrip members which fold to lie along the steering bar; and a seat and backrest which fold down essentially parallel to the main frame member. Forward and rear seat support members may each include a box-like storage compartment.

A process for building recumbent bicycles to fit their riders. The first step is to build an adjustable recumbent bicycle frame designed for adjustability in the location of all the major elements of the bicycle; including position and angle of seat, position of wheels and pedals or other foot power means, position and caster angle of steering axis and position of handlebars or other steering means. Then individual riders or classes of riders test the adjustable frame model, and work out configurations that fit their body build and style of riding. Finally, lighter weight less adjustable or non-adjustable bicycle frames are built, copying the measurements between the elements of the adjustable frame bicycle, as configured when tested. One unique aspect of the present invention is that the adjustable frame utilized provides for both vertical and longitudinal adjustment between the bicycle seat and the rear wheel. Thus this parameter can be ergonomically optimized. Then the positioning of the front wheel and its steering geometry can be optimized. Finally the position of the foot pedal mechanism and handlebars can be optimized for the rider with respect to the other components.

A recumbent cycle whose seat can be quickly repositioned on the frame to provide for adjustable spacing between the seat and the pedal assembly. The seat has a rod which extends rearwardly from the backseat portion thereof at a location near the upper portion of the back seat and the rod is slidably received in a tubular portion of the frame. in one embodiment, the tubular portion of the frame has an aperture extending therethrough, and the rod portion of the seat has a spaced apart series of apertures extending therethrough, any one of which can be brought into alignment with the aperture in the tubular portion. A hand-removable U-shaped clip is provided to secure the seat in a predetermined position relative to the frame by inserting a leg of the clip through the aperture in the tubular portion and an aligned aperture in the rod. In another embodiment, the tubular portion is provided with a hand operated, quick release latching mechanism to secure the rod of the seat in a desired position relative to the tubular portion of the frame. The seat is provided with a pair of spaced apart, downwardly facing C-shaped brackets which partly surround and engage a sleeve that is affixed to a horizontal support bar portion of the frame and which are slideable along the horizontal support bar portion.

An apparatus including a wheel chair, with a horizontal mount positioned between upper and lower horizontal framework members of the wheel chair, with a yoke member secured to the mount positioned interiorly of the wheel chair framework. A bicycle structure includes a forward and rear wheel mounted within a framework, with the framework further including drive crank mounted to the frame of the bicycle adjacent an upper tubular extent of the framework, and wherein the bicycle includes a rearwardly directed boss member securable to the yoke of the wheel chair, wherein the boss member is spaced above a lower contact portion of a rear wheel of the bicycle a predetermined distance greater than a spacing of the yoke relative to a bottom contact surface of a forward wheel assembly of the wheel chair to elevate a forward end of the wheel chair in securement to the bicycle.

A semi-recumbent bicycle allows the rider to sit on a high-backed seat elevated above a rear wheel in a semi-recumbent position with his legs extending forward and angling downward to a pedal crank assembly. The bicycle includes an elongated relatively large hollow main frame or frame member connecting a front steering assembly and front wheel at the front end of the bike to the rear wheel and the seat at the rearward end of the bike. The pedal crank assembly is positioned in the area of the steering assembly above the front wheel. The elongated main frame member has at least one large hollow area, and an access opening with attached door to render the hollow area a convenient integral lockable storage compartment for items such as tools, books, bicycle helmets, and groceries for example. The major portion of the storage compartment is positioned centrally between the front and rear wheels in order to assist in preventing heavy cargo from causing the bicycle to exhibit poor handling characteristics due to improper weight distribution.