| 摘要 |
FIELD: polygraphy. ^ SUBSTANCE: pull-out core pencil has a casing with an inner channel furnished with diametrically arranged grooves along the said channel accommodating a writing rod with its end provided with a sleeve with radial ledges for sliding contact with the said channel grooves and a tip for extended end of the writing rod. The said rod can rotate inside the casing inner channel. The said channel accommodates a cylinder spring with closed coils all along its length and with an outer diameter allowing a sliding contact with the casing inner channel. The writing rod tail sleeve is arranged inside the said spring, the radial ledges being made as helical blades and arranged between the spring coils. The casing incorporates also with a plug that can turn around on the casing end. The plug and the tip are furnished with stops on inner end faces to rest upon the spring ends. ^ EFFECT: expanded application range. ^ 1 dwg |
