FIELD: polygraphy.
SUBSTANCE: design contains a case with a diamond or hard-alloy tip, where the apex of the tip lies on the longitudinal axis of the symmetry of the case. Tip is formed in the form of an incorrect pyramid with different areas of borders and the apex angle, number of faces are from 3 to 10, apical feeding angle of the whole incorrect pyramid lies in the interval from 45° to 130°, relation of the height of the tip to the length of the case lies in the interval from 0.006 to 0.16, in this situation the case is provided with a cylindrical shank, and the relation of the diameter of the shank to the diameter of the case lies in the interval of from 0.8 to 1.2, relation of the length of the shank to the length of the case lies in the interval of from 0.8 to 0.32.
EFFECT: optimisation of the impact effect on a hard surface, improving and simplification and cheapening the design, widening the nomenclature of production, increasing the quality of the image obtained.
3 dwg
