Faculty Advisor

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

Date Accepted

April 2016


Mechanical Engineering

Project Type

Major Qualifying Project



Advisor Department

Mechanical Engineering