A two wheel semi-recumbent bicycle provided in several embodiments on which the rider sits elevated above the rear wheel on a high-back bucket style seat supported by an angled top tube. The position of the pedal crank assembly is forward and upward of the pedal crank position of conventional bicycles and downward and rearward of that normally associated with fully recumbent bicycles relative to the seat. The rider steers by way of long upwardly curved handlebars affixed to an elongated steering stem originating in a front steering head assembly. The steering stem extends upward and rearward terminating under the area of the rider's upper legs. One version of the semi-recumbent bicycle features a telescoping angled top tube supporting the seat at its upper end to allow both vertical and horizontal adjustment of the rider's position. Other embodiments are provided with removable seat and chain stays replaceable with stay of various lengths to effectively alter both the size and frame geometries of the bicycle. In another variation the seat stays are spring biased shock absorbers and the chain stays are pivotally attached to provide the rider with cushioned ride.
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 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.
A bicycle includes front and rear wheels, which are mounted respectively on front and rear ends of a bicycle frame. The bicycle frame has an inclined main tube that extends rearwardly and downwardly from a head tube to a seat tube. A drive sprocket is disposed on the main tube, and is located between the head tube and the seat tube. As such, the total length of the bicycle can be shortened.
The invention is a bicycle having adjustable orientation of the seat (6) and the pedals (4) with respect to the handle-bars (5). The bicycle comprising an x shaped frame comprised of a profile (31) and a rigid support member (32) that are rotatably connected to each other by a hollow pin (42). The rider of the bicycle can change the angle between the profile (31) and the rigid support member (32) to rotate about the hollow pin (42). The bicycle further comprises a seat (6), attached to the upper part of the rigid support member (32), a first toothed-wheel (33) attached to the frame (32) by means of a pin passing through the toothed-wheel (33) and the lower part of the rigid support member (32). The pin has a crank and pedal (4) attached to each of its ends. The bicycle also comprises a front gear and second toothed-wheel (7) attached to a pin that passes through the hollow pin (42) located between the seat (6) and the first toothed-wheel (33).
The two-wheeler in the form of a dandy horse is propelled by the user by pushing (walking) with his or her feet on the pavement. The dandy horse having a frame (1), a front and a back wheel (3, 4) rotationally mounted therein, a saddle (5) supported by the frame (1) and handlebars (6) supported on the frame (1) for the front wheel (3). The frame (1) consists of an upper longitudinal tube (7), and steering tube (9) with a front wheel fork (10), a saddle support tube (11) and a back wheel fork (12, 13) made of metal and/or plastic and/or a composite material
