D. Braun, S. Kim, Variable Stiffness Mechanisms for low Energy Cost Stiffness Modulation, US Patent Application 17/506,164, 2021.
This patent describes a variable-stiffness floating spring mechanism that can change stiffness without altering the energy stored in the spring. The design allows amplification of human output and supports augmentation of physical performance beyond natural human capability.
Why it matters: Conventional stiffness modulation often requires significant energy input and limits practical use in human augmentation. This invention enables low-cost stiffness control while enhancing human strength and mobility, paving the way for more capable exoskeletons and assistive devices.