Collector type writing instrument

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 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,
• a clearance portion allowing for ink and air bubbles to move therethrough is provided between the collector and snorkel, by forming a spacer portion defining the size of the clearance portion,
• 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 an ink conduit, and
• the arrangement is configured so that the following relations 1 and 2 hold:
• Ts>Is relation 1:
• Tt>It, relation 2:
• where ‘Ts’ is a total minimum cross-section of the vent portion, ‘Tt’ is a total distance of the vent portion, ‘Is’ is a total minimum cross-section of the ink conduit and ‘It’ is a total distance of the ink conduit.

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 in the ink tank 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 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,
• a clearance portion allowing for ink and air bubbles to move therethrough is provided between the collector and the sectioning portion,
• the parts present from the sectioning portion to a rear end of the collector, except the ink tank, are integrally molded, fixed close to with a small enough gap therebetween or fixed in contact with at least one of the ink tank, sectioning portion, and collector while the parts present from the sectioning portion to the rear end of the collector, except the ink tank, are laid out so that ink will be able to spread and wet the surfaces of the parts other than the ink tank inner wall,
• 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:
• Ts>Is relation 1:
• Tt>It, relation 2:
• where ‘Ts’ is a total minimum cross-section of the vent portion, ‘Tt’ is a total distance of the vent portion, ‘Is’ is a total minimum cross-section of the ink conduit and ‘It’ is a total distance of the ink conduit.

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 snorkel which, integrally or as separate parts, includes a sectioning portion for substantially separating the ink tank, a vent portion for establishing air communication between the front and rear spaces is divided by the sectioning portion, and an ink conduit for establishing ink communication between the divided front tank and rear tank,
• 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:
• relation I :
• TS > Is
• relation 2 Tt > It,
• where ‘Ts’ is a total minimum cross-section of the vent portion, ‘Tt’ is a total distance of the vent portion. ‘Is’ is a total minimum cross-section of the ink conduit and ‘It’ is a total distance of the ink conduit.