Coating implements with material supply – Material flows through porous tool – Wick feed from within reservoir to tool
Utility Patent
1999-01-26
2001-01-02
Recla, Henry J. (Department: 3751)
Coating implements with material supply
Material flows through porous tool
Wick feed from within reservoir to tool
C401S205000, C401S209000, C401S216000
Utility Patent
active
06168336
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a ballpoint pen for ink. Particularly, the invention relates to a ballpoint pen in which the ink is freely received in the shaft of the ballpoint pen or is received in a cartridge. The ballpoint pen includes a supply wick, a compensating body and a writing tip with a ball, wherein the ball is fastened and rotatably mounted in a tube, and wherein the tube has a continuous ink duct.
2. Description of the Related Art
The ballpoint pens in question are particularly those which are directly filled with liquid ink, i.e., low viscosity ink. The ink to be used can be manufactured on the basis of water or alcohol and may be freely present in the ballpoint pen. The proposed ballpoint pen can preferably be used as a manual writing utensil or also as a writing or drawing insert in registering devices, plotters, or other automatic or mechanical recording devices or mechanical units.
Such a directly filled ballpoint pen usually is composed of a shaft and/or a cartridge in which the ink is contained and which serves simultaneously as a holder as well as a reservoir, a liquid supply system connected or connectable to the reservoir and possibly a compensating system and a writing tip and possibly a closing cap and further parts.
Ballpoint pens of this type are known in principle. For example, DE-OS 44 34 164 describes and illustrates various writing inserts for ink writing utensils with different writing tips which include a supply system as well as a compensating system. In the ballpoint pen tip shown, for example, in
FIG. 1
of DE-OS 44 34 164, the writing ball is mounted in a thin tube. Placed in the wall of the tube is a wick or needle in order to improve the highly capillary ink flow up to the ball.
Particularly when the ballpoint pens are manufactured on an industrial scale, it has been found that tips of this type are relatively expensive. In addition, the ink systems have the tendency to easily dry or clog in the tip area.
German patents 23 07 620 and 806 413 disclose additional ballpoint pens of the above-described type which include capillary pin-shaped inserts in the supply area, so that a good flow of the writing medium is ensured. In German patent 23 07 620, a cartridge is provided as the writing medium reservoir and in German patent 806 413, the ink is directly filled into the shaft.
The disadvantages of these writing utensils are particularly to be seen in the fact that they have no compensating systems, as in the case of German patent 23 07 620, or only very insufficient compensating systems, as is the case in German patent 806 413, and, therefore, have the tendency to leak particularly in the case of pressure variations. In addition, the ink discharge may take place irregularly if the end portions of the intermediate wicks do not sufficiently absorb or discharge the ink.
These known ballpoint pens are also not suitable or only insufficiently suitable for the use of small balls to carry out fine strokes or lines.
SUMMARY OF THE INVENTION
Therefore, it is the primary object of the present invention to provide a directly filled ballpoint pen which is also suitable for relatively small balls, wherein the ballpoint pen can be manufactured in a simple, inexpensive and economical manner, wherein the ballpoint pen can receive a large ink volume and the ink volume can be properly and completely used up, and wherein the ballpoint pen still compensates pressure variations well and writes reliably over long periods of time.
In accordance with the present invention, the ink duct of the ballpoint pen is constructed as a free throughbore and does not have any additional core bodies or ink conductors, and the supply wick extends axially completely through the compensating body in the area of the compensating chamber.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of the disclosure. For a better understanding of the invention, its operating advantages, specific objects attained by its use, reference should be had to the following descriptive matter in which there are described preferred embodiments of the invention.
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Kolb Horst
Thost Horst
J. S. Staedtler GmbH & Co.
Kueffner Friedrich
Prunner Kathleen J.
Recla Henry J.
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