Abstract: This invention aims to remedy the risks associated with finger injuries when accidentally closing doors and windows and where victims are usually small children. It consists of the implementation of a preventive and safe device that operates in a similar fashion like a spiral notebook, thus preventing the fingers from being accidentally inserted in the rabbet between the leaf and the frame. This device consists of two parts: a strip fixed on the internal surface of the leaf and coils that penetrate through openings in channels made in the frame. When the leaf is closed, the coils use the channels in the frame; when opened, the coils come out of the channels and thus prevent the fingers from being inserted in the rabbet between the leaf and the frame.