FIELD: polygraphy.
SUBSTANCE: autopencil contains a tapered nose piece made integral with the hollow cylindrical tail part furnished with diametrically arranged through cut and a flange on its end, with outer diameter equal the nose piece taper base diameter. The tail part houses a lead holder with radial ledges that enter the tail part cylinder cuts and a lead. The tail part outer surface accommodates a helical cylinder spring fitted thereon having a closed coils and extending over the entire length from the nose piece taper base to the flange. The spring inner diameter allows a sliding contact with the tail part cylinder surface, while the lead holder radial ledges represent screw blades to engage with the spring coils.
EFFECT: simpler design, reliability and ease of use.
2 cl, 1 dwg
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