Patent ID: 6619871
Filing Date: 2003-09-16
Classification: B43K

Abstract:
A collector type writing instrument including:a point assembly with a writing point at the tip thereof, an ink tank for storing a low viscosity ink in a free-state ink condition, an ink feeder portion extended from the ink tank to the point assembly, and a collector disposed between the ink tank and the point assembly as an adjuster element for storing ink within a plurality of grooves when an inner pressure is adjusted, the writing instrument characterized in that: the ink tank is formed therein with a sectioning portion for substantially separating the ink tank and a snorkel having a tubular vent portion for establishing air communication between the front and rear spaces divided by the sectioning portion, an ink conduit of a size smaller than that of the vent portion is arranged in either the sectioning portion or the ink tank inner wall or both, the vent portion of the snorkel has front and rear openings, the rear opening is disposed, with respect to the axial direction, at a position more rearward than the ink conduit, and the arrangement is configured so that the following relations 1 and 2 hold: â€ƒTs>Isâ€ƒâ€ƒrelation 1:Tt>It,â€ƒâ€ƒrelation 2: â€ƒwhere â€˜Tsâ€™ is a total minimum cross-section of the vent portion, â€˜Ttâ€™ is a total distance of the vent portion, â€˜Isâ€™ is a total minimum cross-section of the ink conduit and â€˜Itâ€™ is a total distance of the ink conduit.