Coating implements with material supply – Bifurcate pointed nib tool – Including reservoir and feeder
Patent
1995-12-04
1998-07-07
Bratlie, Steven A.
Coating implements with material supply
Bifurcate pointed nib tool
Including reservoir and feeder
401231, 401233, 401236, 401266, B43K 800, B43K 104
Patent
active
057758280
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a writing implement and, more particularly, to a writing implement that feeds the tip of a nib with ink contained in an ink tank to write characters and the like on a sheet of writing paper by bringing the tip of the nib into contact with the writing paper.
BACKGROUND ART
A fountain pen is a generally known writing implement provided with a nib formed by processing a metal plate. As shown in FIG. 19, a nib 1 for a fountain pen is pressed in a neck tube 3 so as to be in contact with the surface of the end a feed tube 2. A slit 1a is formed in the nib 1 from the middle part to the tip 1b. The feed tube 2 is provided with an ink feed groove 2a in its surface in contact with the nib 1. The ink feed groove 2a extends to the base end of the feed tube 2 and communicates with the interior of an ink tank 4 detachably mounted on the end of the neck tube 3 opposite Nit 1.
The ink contained in the ink tank 4 flows through the ink feed groove 2a to the slit 1a of the nib 1 and the slit 1a guides the ink to the tip 1b. Thus, the tip 1b of the nib 1 is put in contact with a sheet of writing paper to write characters and the like on the sheet of writing paper.
As shown in FIG. 21, the feed tube 2 is provided with an air vent groove 2b communicating with the interior of the ink tank 4, and collector grooves 2c. As shown in FIGS. 22 and 23, the air vent groove 2b communicates with an air vent groove 2e by means of a connecting groove 2d. As the ink contained in the ink tank 4 is consumed through the nib 1, a quantity of air corresponding to a consumption of the ink flows through the air vent groove 2e, the connecting groove 2d and the air vent groove 2b into the ink tank 4 in bubbles to enable the ink to flow smoothly from the ink tank 4 to the nib 1.
The collector grooves 2c communicate with the interior of the ink tank 4 by means of the ink groove 2a. The ink forced to flow out of the ink tank 4 by the expansion of air in the ink tank 4 is stored in the collector grooves 2c.
The nib 1 must be in close contact with the feed tube 2 with the slit 1a in alignment with the ink feed groove 2a because the ink is transferred from the ink feed groove 2a of the feed tube 2 to the slit 1a of the nib 1 by capillarity. However, it is difficult, in view of manufacturing tolerance, to put the nib 1 in close contact with the feed tube 2 with the slit 1a in alignment with the ink feed groove 2a and, in most cases, the slit 1a is slightly dislocated from the correct position relative to the ink feed groove 2q as shown in FIG. 20.
If the slit 1a is dislocated relative to the ink feed groove 2a, a gap 5 is formed between the nib 1 and the feed tube 2 and the gap 5 is filled up with the ink by capillarity and the ink is fed from the ink feed groove 2a of the feed tube 2 through the gap 5 to the slit 1a of the nib 1. If writing is interrupted and the fountain pen is left unused for a while, the ink filling up the gap 5 dries and the dry ingredients of the ink accumulate in the gap 5.
If the dry ingredients of the ink accumulate in the gap 5, the dry ingredients of the ink block the flow of the ink from the ink feed groove 2a to the slit 1a of the nib 1 and, consequently, it is impossible to write with the fountain pen after the same has been left unused for a while.
Nibs proposed to solve such a problem are disclosed in Japanese Utility Model Laid-open Nos. 2-36485 and 58-45093. The nib disclosed in Japanese Utility Model Laid-open No. 2-36585 is formed by folding a plate in two, and has an ink passage formed between the overlapping portions of the folded plate to feed the ink to the tip thereof. The nib disclosed in Japanese Utility model Laid-open No. 58-45093 is formed by superposing a metal plate and a synthetic resin plate one on top of the other, and has an ink passage formed between the metal plate and the synthetic resin plate to feed the ink to the tip thereof.
Since the ink passage of the nib disclosed in Japanese Utility Model Laid-open Nos. 2-36485 or 58-45093, not like the ink p
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Bratlie Steven A.
Kabushiki Kaisha Pilot
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