Indian ink drawing pen - flexible ink container has reinforcements compensating against collapse

摘要

The pen has a bubble (10) consisting of thin, very flexible material, to act as ink container. The open end of the bubble is pushed sealed via a broad ring (9), onto a conical section (1). The other bubble end is sealed. The bubble is contained in a barrel section (4) with a small bore (8), for pressure compensation. The bubble also has a reinforcement (11) to avoid its collapse in a longitudinal direction. Alternatively, the pen may have an ink container of rigid material, but without a compensation channel. The rigid container has a bubble of thin, very flexible material, which is connected to the outside via a small bore. The bubble contains a reinforcement and is able to compensate by inflating when a low pressure, is applied by the flowing out of the ink.