Cobb, Eben C.
Reduced functionality of the hamstring muscle creates a need for a device to assist in riding a bicycle. The project is to design a device to enable a person who has reduced usage of the hamstring muscle to ride a bicycle by aiding leg motion between the pedal angles of 180° to 225°. The device is for recreational cycling, and adaptable to a range of bicycles. Design concepts were made to store energy provided during the portion of the pedal stroke in which the user can provide power (0°-180°), so it could be utilized during the portion of the pedal stroke where the user cannot provide power due to their disability (180°-225°). The final design uses a pair of extension springs with a four stage pulley system to store energy and provide the range of motion for the pedal stroke.
Worcester Polytechnic Institute
Major Qualifying Project
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