archimides hand with spring for auto-reset (close) & auto-open

grabcad

This is a prosthetic arm, which consists of three claws.The shape which is influenced by the spiral of Archimides , the hand can be very easily gripping anything merely touching an object , the hand opens as well has been reset by the spring located internally of two elements, thus firmly holding anything. Τhis idea is both hands functional without having to press a button with the other hand !!!!