Patent ID: 6106180
Filing Date: 2000-08-22
Classification: B43K

Abstract:
A handwriting or ink applying device comprising:a casing (1);a writing tip (4) at the front end of the casing for writing or drawing on a surface;a chamber (6, 7) disposed in the casing (1) for containing writing liquid, wherein the chamber (6, 7) communicates with the rear end of the writing tip (4) to supply ink thereto;a bubble (8) comprised of flexible, nonelastic material disposed in the chamber (6, 7) and sealed against the writing liquid in the chamber (6, 7), the bubble interior being in communication with the ambient air;a flexible storage container (2) disposed in the casing (1) for holding a supply of writing liquid, wherein the storage container (2) is sealed against the ambient air and flexes in response to ambient pressure; anda valve (15) disposed between the chamber (6, 7) and the container (2);wherein, as the supply of writing liquid in the chamber (6, 7) falls, the bubble (8) expands in response to the pressure difference between the ambient air and the pressure in the chamber (6, 7) to open the valve (15) and admit writing liquid from container (2) to the chamber (6, 7), and as the writing liquid fills up the chamber (6, 7), the bubble (8) contracts in response to the pressure difference between the ambient air and the pressure in the chamber (6, 7) and closes the valve (15) when the liquid reaches a predetermined level.