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Priority to ES1977232458UpriorityCriticalpatent/ES232458Y/en
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Publication of ES232458YpublicationCriticalpatent/ES232458Y/en
Improved screw, essentially characterized in that the diametrical groove made in its head for its activation, presents from its half and on each side, a plane that does not face the opposite plane, so that. The vertical plane of the half of the groove corresponding to the radius of said diametral groove, is on the other side than the other vertical plane facing the groove, while on the opposite side of the groove facing the planes of each half as it remains described, there is a curved concave cavity so that the screwdriver located in the slot of the screw, only acts by exerting traction in the direction of tapping when resting on the opposite planes of the slot, and when turning in the other direction slips and escapes over the cavities curved concaves on the other side of the slot opposite the support planes. (Machine-translation by Google Translate, not legally binding)