This paper presents the design and prototyping of an inherently compliant lightweight hand mechanism. The hand mechanism itself has 15 degrees of freedom and five fingers. Although the degrees of freedom in each finger are coupled, reducing the number of independent degrees of freedom to 5, the 15 degrees of freedom of the hand could potentially be individually actuated. Each joint consists of a novel flexing mechanism that is based on the loading of a compression spring in the axial and transverse direction via a cable and conduit system. Currently, a bench top version of the prototype is being developed; the three joints of each finger are coupled together to simplify the control system. The current control scheme under investigation simulates a control scheme where myoelectric signals in the wrist flexor and extensor muscles are converted in to x and y coordinates on a control scheme chart. Static load-deformation analysis of finger segments is studied based on a 3-dimensional model without taking the stiffener into account, and the experiment validates the simulation.

Issue Section:
Technical Papers
Keywords:
artificial limbs, electromyography, prototypes, medical control systems, High Degree of Freedom, Hand Mechanism, Compliant Lightweight Mechanism
Topics:
Cables, Compression, Deformation, Degrees of freedom, Design, Grasping, Motors, Springs, Stress, Weight (Mass), Control systems, Engineering prototypes, Artificial limbs, Signals
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 by American Society of Mechanical Engineers
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