This paper presents a novel flexible pivot with large angular range and small center shift. It is conceived to provide the inter-phalangeal rotational degrees of freedom of the fingers of a new bio-inspired robotic hand, simultaneously removing friction and backlash from the mechanism. The specifically developed mathematical model shows that the proposed solution meets all design requirements. Preliminary tests carried out on a prototype show an accurate matching between the model and the real behavior. The advantages offered by the new flexible pivot can be extended to any robotic application where frictionless, zero-backlash, compact and easy to manufacture pivots are required for pure rotation over long angular strokes.

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