Refill for ball-point pen - has reserve cylinder with own writing point connected to refill tube by sleeve

摘要

The ballpoint pen refill has a reserve cylinder(1) on the end facing away from the writing point(4, 5) covered by a protective cap(8). The reserve cylinder is sealed at its free end by an intermediate wall fitted with a ventilation bore(7). The container holding the reserve ink supply is located within the area of the refill's other end and the reserve cylinder(1) is attached to the second writing point by a connecting sleeve(10).