CARTRIDGE PEN Russian patent published in 1999 - IPC

FIELD: writing devices. SUBSTANCE: cartridge pen has a knock-down case, replaceable stem composed of two detachable components-writing cartridge consisting of an external casing accommodating a capillary tube with a writing end-piece on one end and a hollow filling cylinder with dye, the cylinder has a hole. A ring-shaped inner stick is made inside one of the casing halves, and an end-piece with a sharp tip for piercing the cylinder at pen filling and a hole for penetration of dye to the capillary tube is made on the other end of the writing cartridge. The replaceable cartridge uses sealant, and the body of the writing cartridge has an annular shoulder for rest on the annular internal flange. The filling cylinder hole is closed with material featuring a property of one-sided passing of dye. The other end of the cylinder is made for piercing of it by the cartridge end-piece. The cartridge and cylinder are joined by screwing together of two halves of the pen. EFFECT: enhanced reliability in use. 3 cl, 1 dwg