Patent ID: 6976551
Filing Date: 2005-12-20
Classification: B62M

Abstract:
1. A pedal- and motor-assist power system for a bicycle which has, at least one drive wheel, and a bicycle frame with front and rear ends, said system comprising: a) a pedal section comprising: b) a sprocket section having a chain-and-sprocket drive connection to said drive wheel; c) a motor section; d) a speed-reducing gear section connecting to said motor section and having a gear section drive output; e) a power assist drive section comprising a power assist drive member concentrically mounted around said crank shaft and having a power-assist drive connection between the gear section drive output and the sprocket section; f) said system being characterized in that the sprocket section has a first pedal overrunning drive connection with said pedal section and the power-assist drive connection has a second overrunning drive connection; whereby said bicycle is able to operate in four operating modes, namely: g) said power-assist drive member having a fixed drive connection to the sprocket section and the power-assist-overrunning drive connection is between the power-assist drive member and the gear section drive output.