Machine element or mechanism – Elements – Cranks and pedals
Patent
1992-02-06
1993-05-04
Braun, Leslie A.
Machine element or mechanism
Elements
Cranks and pedals
745942, 475331, G05G 114, F16H 128
Patent
active
052071197
ABSTRACT:
A pedal mechanism for a human propulsion vehicle such as a bicycle wherein the length of each of the pedal arm is increased during the power stroke and decreased during the return stroke of the rotation cycle. It comprises a pair of sun gears rigidly attached to the frame of the vehicle, each meshed to an adjacent planetary gear of identical diameter. A lever, radially projecting from each of the planetary gears, generate the alternative movement of the corresponding pedal arm. The levers also change the angular orientation of the pedal arms by moving them toward the power stroke zone, forcing the pedals arm to stay as long as possible in power stroke, thus giving the pedal mechanism no dead point. This pedal mechanism is very suitable for bicycle, especially mountain bicycles and racing bicycles where high power and efficiency are crucial.
REFERENCES:
patent: 518777 (1894-04-01), Carr
patent: 631208 (1899-08-01), Frazuer
patent: 4193324 (1980-03-01), Marc
patent: 4271719 (1981-06-01), King
patent: 4425824 (1984-01-01), Koch
patent: 4706516 (1987-11-01), Xi
patent: 4807491 (1989-02-01), Stuckenbrok
patent: 4882945 (1989-11-01), Trevizo
patent: 4960013 (1990-06-01), Sander
Braun Leslie A.
Greigg Edwin E.
Greigg Ronald E.
Ta Khoi Q.
LandOfFree
Pedal mechanism for a human propulsion vehicle does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pedal mechanism for a human propulsion vehicle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pedal mechanism for a human propulsion vehicle will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1968100