Importance

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Abstract

A writing instrument includes a barrel, an ink reservoir, an ink outlet ring, a control valve, an ink absorbing sponge, a core seat, a nib and a cap. The barrel has an upper portion forming an upper barrel chamber of a larger external diameter, an intermediate section forming a lower barrel chamber, and a lower section forming a barrel channel of an even smaller internal diameter. The ink reservoir is adapted to receive ink. The control valve includes a valve seat, a valve cap, and a spring. The center of the valve seat has a seat hole passing through and communicated with a seat clearance of a smaller size at a lower end. An upper end of the valve seat is centrally provided with a projecting seat rod. A seat wing projects from a lower portion of the valve seat, with a seat post having the seat clearance disposed below. The ink absorbing sponge is adapted to absorb ink. The core seat has an upper section forming a hollow sponge chamber that is communicated with a core tube of a smaller size at a lower section. The nib has an intermediate section the external diameter of which corresponds to the core tube. The cap has an interior space shaped and sized to match those of the lower section of the barrel, and is provided with a cap stepped portion. The nib is inserted into the core tube, and the ink absorbing sponge is disposed in the sponge chamber.

First Claim