Improved cross groove for screw head screw plate (Machine-translation by Google Translate, not legally binding)

摘要

Improved cross-groove for screw head with metal thread whose head is of tapered shape with a wide conical hollow centered on it and whose cone bottom with a wide angle of taper at the apex is sufficiently distanced from the throat of the screw to avoid weakening the robustness of the assembly characterized in that in the solid sectors determined by the spaces between the usual four grooves, two recesses are punched, which following the general conicity of the central void have a double sector with a frustoconical surface and because the head of the screwdriver in addition to the penetrating projections in the cross of grooves base of the lace in the head of the thyme has conical protruding nerves so that penetrating in the intermediate incoming precincts increase the adhesion surface between screwdriver and thyme being this adhesion sufficient so that the set of both elements can be handled by r the operator with any inclination when the thyme is threaded into the corresponding hole in the threaded plate without any of these inclinations being able to detach the screwdriver screw if necessary. (Machine-translation by Google Translate, not legally binding)