Here is an early motorcycle which is an adaption of a bicycle. The motor is below the frame, and the gas tank is attached to the seat tube. The motor grabs the bicycle chain in front of the chainwheel, and takes over from the bike rider. It appears that the pedals would be furiously spinning as the motor drove the bike, so I don't know what the rider did with his feet. Maybe the motor didn't turn the pedals so fast that the rider could not keep his feet on the pedals. There is a throttle on the handlebar.
The worm gear shown in figure 4 indicates a large-order speed reduction to the motor's driving sprocket, suggesting that driven cranks might not exceed normal pedaling speeds. My product also drives the pedals, and this concern springs early to peoples' minds. In practice it's no different from fixed-gear or tandem designs featuring chain-driven pedals.
Posted by: todd | November 01, 2005 at 08:39 PM
Scratch that - I read the full disclosure and apparently the motor does not engage the cranks, while the cranks are useful in starting the motor: http://patimg1.uspto.gov/.DImg?Docid=US000575639&PageNum=5&IDKey=E451FEC06B4E&ImgFormat=tif
Posted by: todd | November 02, 2005 at 12:22 PM
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