Coating implements with material supply – Bifurcate pointed nib tool – Including reservoir and feeder
Reexamination Certificate
1995-02-22
2001-06-19
Bratlie, Steven A. (Department: 3751)
Coating implements with material supply
Bifurcate pointed nib tool
Including reservoir and feeder
C401S199000, C401S227000, C401S228000, C401S229000
Reexamination Certificate
active
06247866
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for producing feeding ducts for writing liquids, particularly for fountain pen nibs, and a duct obtained by the method.
BACKGROUND OF THE INVENTION
Ink ducts are known for the nib of a fountain pen. Such ducts generally consist of a plastic cylindrical element and are provided with a plurality of circumferential grooves, defining respective fins, and with a longitudinal groove approximately 1 mm deep and 0.1-0.15 mm wide providing the channel through which ink is fed to the nib.
The longitudinal groove in question, which doesn't extend along the entire length of the duct and substantially ends at the juncture of the application zone of the nib, is formed during the moulding operation by positioning a laminar insert, of corresponding dimensions, internally of the mold.
These known ink ducts present certain drawbacks, and in particular:
a constructionally laborious method of fashioning the longitudinal groove, due to the small dimensions of the laminar insert, which can become displaced during injection of the plastic material; and
a certain difficulty in utilizing multiple impression moulds, likewise due to the small dimensions of the laminar inserts which are subject to varying pressures.
BRIEF DISCUSSION OF THE PRIOR ART
FR-A-1570203 relates to an absorbing element consisting of two half portions to be connected through capillary systems to the support for a nib and to a reservoir.
EP-A-0380696 relates to a reservoir for storing ink temporarily in accordance with the variation of the pressure and temperature in an ink tank.
Fr-A-2310226 relates to a plastic nib for a fountain pen, provided with a longitudinal capillary.
SUMMARY OF THE INVENTION
The aim of the present invention is to produce a feeding duct for writing liquid in a simple, easy and cheap way.
According to the invention such an aim is attained through a method of producing feeding ducts for writing liquids, particularly for fountain pen nibs, wherein the duct consists of a substantially cylindrical element having a plurality of circumferential grooves serving to create respective fins, of a support for a nib and of a connecting means to an ink reservoir. The feeding duct has two distinct portions disposed symmetrically in relation to a longitudinal plane, and each portion has a longitudinal recess extending along the entire length of the portion apart from the front end thereof. The portions combine so that the recess of the portion form a groove when the two portions are secured one to another.
The present invention also has a feeding duct comprising a substantially cylindrical element having a plurality of circumferential grooves, which create respective fins, of a support for a nib and of a connecting means for an ink reservoir. The feeding duct formed from two distinct portions, disposed symmetrically in relation to a longitudinal plane, which can be secured one to another, and each portion is provided with a longitudinal recess extending along the entire length of the portion apart from the front end thereof. The two portions attach so that the recess of the portions form a groove when the portions are secured one to another.
REFERENCES:
patent: 5087144 (1992-02-01), Wada et al.
patent: 1214113 (1966-04-01), None
patent: 3931161 (1991-03-01), None
patent: 0380696 (1990-08-01), None
patent: 1570203 (1969-04-01), None
patent: 2310226 (1976-12-01), None
patent: 1183713 (1970-03-01), None
patent: 2122953 (1984-01-01), None
Bratlie Steven A.
Hoffman Wasson & Gitler
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