US 6,439,592 B1 · Two-wheel drive two-wheeled vehicle

Abstract

The present invention is a fully functioning two-wheel drive bicycle and embodiments thereof. The drive train which supplies power to the front wheel is incorporated into a modified frame and comprises a rear wheel driven by the traditional chain or shaft mechanism and the front wheel driven by a series of rigid shafts or other internalized drive systems. The front wheel drive is adaptable to all bicycle frame geometries including the double diamond mountain bike and road bicycle frame, touring, commuter and comfort bicycles, BMX, trials bicycles, and recumbent and tandem bicycles. The drive train lengthens and shortens in parallel with the shock-absorbing front fork and rear suspension. An engagement clutch, a one-way hub, and torque limiting clutch are also disclosed.

Claims10

Dependent claims

A front fork assembly for a two-wheel drive two-wheel vehicle which includes a rear wheel drive assembly, a front wheel drive assembly, and a frame having a head tube, the front fork assembly comprising:

a neck tube configured to be disposed at least partially within the head tube;
said neck tube defining a cut away portion to permit a portion of the front wheel drive assembly to pass therethrough and to enable rotation of said neck tube around the portion of the front wheel drive assembly and having an upper end and a lower end;
a fork crown attached to the lower end of the neck tube;
a left fork member attached to said fork crown;
a right fork member attached to said fork crown opposite said left fork member;
said left fork member and said right fork member including a dropout at a distal end of each said fork member, said dropout attachable to a front wheel.

3 more elements

Dependencies are inferred from the claim text.

Two-wheel drive two-wheeled vehicle

Life of this patent

Two-wheel drive two-wheeled vehicle

Life of this patent

Abstract

Claims10