US Patent 11548261 Structure with selectively variable stiffness

A stiffness control and systems for the same are disclosed herein. A first plate and a second plate can be connected with rigid support, a hydraulic actuator and a high roughness surface. Upon actuation, the actuator can force the high roughness surface against the first plate, thus increasing rigidity through hydraulic pressure against the first plate and the second plate. Thus, the stiffness of the surface can be altered in a variable and reversible fashion.