Exchangeable pen for recording instruments - is designed with writing point and ink tank form one single constructional unit

摘要

The ink tank (1) has a pressure equalising hole above the liquid level. It is box-shaped, and a slightly inclined partition (7) is provided inside it between the ink and the hole (6). It leaves a hole (11) at its lower end, and an ink drip (12) is provided above the partition (7) between the hole (11) and the pressure equalising hole (6). A small capillary tube (2) is inserted into the tank, the tube being supported by small plugs (4) one end of the capillary tube (2") is open and is positioned near the corner of the ink tank, and the other end has a small plastics writing pen tip inserted into it.