Modular adjustable front wheel drive bicycle frame
OwnerJames E.S. Parkerinventor
Life of this patent
Estimating the term…
Abstract
A front wheel drive recumbent bicycle frame and bicycle are described wherein the wheelbase is adjustable between a fully extended position and a fully retracted position by adjusting the length of a telescoping main tube. The main tube of the bicycle frame rises as it extends rearwardly relative to both a flat underlying surface and a line drawn from the front dropouts to rear dropouts. Accordingly, the adjustment of the wheelbase also changes several important bicycle parameters including the head tube angle, trail, and backrest angle.
Claims17
A bicycle frame assembly for a front wheel drive front steering recumbent bicycle, the bicycle frame comprising:
- a front triangle assembly including a pair of front fork blades terminating in front dropouts, and a control tube having a bottom bracket mount at a forwardmost control tube end;
- and
- a main frame having (i) a head tube pivotally coupled to the front triangle assembly, (ii) a pair of rear stays terminating at rear dropouts at a rear stay back end, (iii) a front tube having a front tube front end and a front tube back end, the front tube front end being attached to the head tube and (iv) a telescoping main tube assembly with a main tube front end fixedly attached to the front tube back end and a main tube back end attached to the rear stays, the main tube assembly extending rearwardly and upwardly at a main tube angle relative to an imaginary line passing through centers of the front and rear dropouts, and the main tube assembly being fixedly adjustable between a fully retracted length and a fully extended length.
A front wheel drive and front steerable recumbent bicycle comprising:
- a frame assembly including,
- (i) a front triangle assembly including a pair of front fork blades terminating in front dropouts, and a control tube having a bottom bracket mount at a forwardmost control tube end;
- and
- (ii) a main frame having a head tube pivotally coupled to the front triangle assembly, a pair of rear stays terminating at rear dropouts at a rear stay back end, a front tube having a front tube front end and a front tube back end, the front tube front end being attached to the head tube;
- a main tube assembly having a fixedly adjustable length with a main tube front end fixedly attached to the front tube back end and a main tube back end attached to the rear stays, the main tube assembly extending rearwardly and upwardly at a main tube angle relative to an imaginary line passing through centers of the front and rear dropouts;
- a front wheel secured to the front dropouts;
- a rear wheel secured to the rear dropouts;
- a handlebar attached to the control tube;
- a drivetrain with a crankset mounted to the bottom bracket mount, a gearset coupled to the front wheel and a chain extending between the gearset and the crankset;
- and
- a seat coupled to the main frame;
- wherein the wheelbase, head tube angle and trail are changed simultaneously by changing the fixedly adjustable length.
Dependencies are inferred from the claim text.