radial quad directional synchronized motion hinge with integrated spring tension
grabcad
This one-piece radial hinge automatically returns to closed position and is ideal for robotic claws or retractable blade propellers. Sized around small bolt dimensions, it can be made smaller if needed. Its continuous "living hinges" allow compact versions, with the unique feature of being normally-closed. Replacing up to 16 regular hinges and springs, this single part prints as a whole entity, designed for nylon SLS printing, with potential adjustments for other mediums. For amusement, try spinning the hinge on a square shaft while attached to weights via string, observing centripetal force-induced opening and closing motion at varying speeds of rotation.
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