Abstract: The present invention relates to an impedance modulation device for an orthotic application. The device includes a high-stiffness loading spring, a low-stiffness return spring, a shaft having an output connector, and an engagement mechanism. When the engagement mechanism engages the shaft, the device exhibits a high stiffness at the output connector, and wherein when the engagement mechanism disengages the shaft, the device exhibits a low stiffness at the output connector.

Abstract: The present invention relates to an impedance modulation device for an orthotic application. The device includes a high-stiffness loading spring, a low-stiffness return spring, a shaft having an output connector, and an engagement mechanism. When the engagement mechanism engages the shaft, the device exhibits a high stiffness at the output connector, and wherein when the engagement mechanism disengages the shaft, the device exhibits a low stiffness at the output connector.

Abstract: A multi-fingered underactuated mechanical grasping system driven by a single actuator, yet can grasp objects spanning a wide range of size, shape, and mass. A member for moving a link relative to a base acts in parallel to a direction of compliance of a joint between the link and the base. The joint has a plurality of degrees of freedom. The number of members for moving links in the grasping system is less than the number of degrees of freedom in the grasping system.

Abstract: A mechanical grasping system that is both simple to fabricate and operate and robust. A multi-fingered hand may be driven by a single actuator, yet can grasp objects spanning a wide range of size, shape, and mass. The hand may be constructed using polymer-based Shape Deposition Manufacturing, with joints formed by elastomeric flexures and actuator and sensor components embedded in tough rigid polymers. The passively compliant, adaptive hand has superior robustness properties, able to withstand large impacts without damage and capable of grasping objects in the presence of large positioning errors, appropriate for use in unstructured and/or human environments.