Bic Corporation

Ronald S Rukan

Barry W Chadwick

Albert D'Addario

Russell McCulloch

Frank Hart

Albert D'addario

A pressurized writing device comprising an ink tube having a first end and second end, a writing tip at the first end, an end plug at the second end, a pressurizing system. The pressurizing system applies a force to a writing medium in the ink tube to force the writing medium out the writing tip pressurization system includes, a compressible ink driving member. The compressibility of the ink driving member assures a secure seal of the writing medium in the ink tube. Additionally, the compressibility permits the ink driving member to wipe ink off the interior surface of the ink tube as ink is expended. Ink residue in the ink tube is thus minimized. In a preferred embodiment, the ink driving member is spherical to facilitate manufacture of the ink driving member and assembly of the writing instrument. The spherical shape also enhances the sealing and wiping effects of the compressible ink driving member.

Pressurized writing instrument employing a compressible piston member

A writing device generally including a uniformly cylindrical main body partially filled with a writing medium such as ink. A writing tip is inserted into a first end of the main body and a first sealing member is inserted into the second end thereof. The first sealing member is located in the main body near the second end. A pressurized gas such as nitrogen is disposed in the body between the ink and the first sealing member. Alternatively, a gas forming system may be provided in the main body to continually produce a gas as the ink is depleted to maintain pressure therein. A second sealing member is inserted into the second end of the main body to provide a dual seal gas pressurized system.

Double seal system for pressurized writing device

A writing instrument is disclosed having a barrel defining an internal passage including an ink reservoir. A venting mechanism is positioned at least partially within the internal passage of the barrel adjacent an anterior end portion thereof. The venting mechanism includes an elongated body defining an axial bore therethrough in communication with the ink reservoir, and a plurality of spaced apart fins peripherally surrounding the elongated body and defining a plurality of annular channels between the fins. Each of the fins defines a groove thereon to interconnect the annular channels. The writing instrument further includes a point support member supporting a writing point and positioned adjacent an anterior end portion of the venting mechanism and defining an axial bore aligned with the axial bore of the venting mechanism. A first ink supply rod is disposed within the axial bore of the venting mechanism and has a posterior end portion in communication with the ink reservoir to convey ink from the ink reservoir to an anterior portion of the venting mechanism. A second supply rod conveys ink from a posterior end portion disposed within the bore in the venting mechanism and contacting the first supply rod to an anterior end portion disposed within the bore of the point support member, to the writing point. A circuitous air path is provided to vent the ink reservoir at the posterior end portion to the writing tip portion.

Fillerless writing instrument

The subject invention is directed to a cartridge for a writing instrument. In particular, the writing instrument includes a surface against which the cartridge abuts. The cartridge includes a tubular body for containing ink which has a front end including an applicator for applying the ink, and a plug member disposed at least partially in a rear end of the tubular body of the cartridge. The plug member includes a path for permitting airflow into the tubular body, and a flange for cushioning the cartridge against the abutment surface of the writing instrument so as to inhibit separation of the ink from the ink applicator and absorb pressure exerted upon the ink applicator during writing.

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Simpsonville, SC, United States of America

Ronald S Rukan