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Expansion Crank / Crank Design

Expansion Crank
Expansion Crank

The motivation of design
it is easy to cause pain in upper waist, lower back (bone spur in back), cramp in sole and damage to the knees for cyclists with leg shortening distance up to 3mm or above. Since they can’t move their patellofemoral joint freely, the joint connecting hip and thigh, will indirectly affecting the ability to stretch knees and lead to the above sport injuries mentioned.

Feature of design
We have added spring to alter the structure of the crank. This design helps to eliminate the distance automatically for users with leg shortening problem so as to greatly reduce sport injuries.

University

Oriental Institute of Technology University

Oriental Institute of Technology University
New Taipei City, Taiwan

Design

Oriental Institute of Technology

Oriental Institute of Technology
University
New Taipei City, Taiwan

Hsieh,Chen-yu Chen,Yi-Hsiang Wu,Chao-chen