ES238428U - Useful to operate safety screws. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Useful for driving safety screws, which is designed to be functionally combined with a perimeter cavity in the shape of an equilateral triangle which, as a shroud for the screw, is concentric to a conical protrusion that does not extend beyond the plane of the screw head ; essentially it is characterized in that it consists of a kind of key whose work end is extended coaxially in an appendix whose lateral surface is determined by three curved-convex planes related to each other by other arcuate planes of considerable smaller radius, all this determining a cross section for such an appendix that is an equilateral triangle with rounded sides and vertices; a conical cavity with a rounded cusp is provided concentrically in the front of the appendix, which goes into the appendix without reaching the full height thereof and with the particularity of having an annular chamfer at the external edge of the appendix. Forming a flat front of approximately trapezoidal section with the start of the cavity. (Machine-translation by Google Translate, not legally binding)