Patent ID: 7770682
Filing Date: 2010-08-10
Classification: B62K,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 drive section connecting to said motor section and having a 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 drive 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 tubular configuration with first and second power-assist member portions on opposite sides of the bicycle, said power-assist drive member and said crank housing being positioned concentrically around a center axis of said crank shaft; and h) said power-assist drive section comprising a length adjustable power-assist drive section comprising a power-assist mid-section positioned between said first and second power power-assist portions, and power-assist position adjustment member mounted to the power-assist mid-section so as to be movable to different positions along the power-assist mid-section in a manner that the distance between the two first and second power-assist portions, are adjustably spaced apart whereby the power-assist system could be used in bicycles having different width dimensions in a drive-section of the bicycle.