Writing implement

Details Writing implement Writing implement

1987-01-28

1988-10-11

Apley, Richard J.

Coating implements with material supply

Material flows through porous tool

401198, 401199, 401206, 401260, 401292, B43K 800

Patent

active

047767189

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

As in the case of the small tube writing implement described, for example, in DE-OS 30 23 189, in the case of this implement, liquid ink, via a small tube, is applied to the writing pad. In the small tube, a wire shaped or wick shaped writing element is arranged that, together with the interior wall of the small tube, forms ink feeding ducts. Said writing wick projects over the end of the small tube located on the outside and, together with it, forms the writing point. It can be slid axially in the small tube against the effect of a spring element. The spring element has the effect that the writing point in any writing postion remains in contact with the writing pad. By means of the axial movement of the writing wick that occurs automatically during the writing, impurities are removed from the small tube. In addition, the pump effect that occurs when the writing point is placed on the pad supports this effect.
In the case of the writing implement according to DE-OS 30 23 189, this spring element consists of an ink permeable plastic-foam cushion or similar device.
This plastic-foam cushion has two disadvantages.
On the one hand, the restoring force of the cushion decreases in the course of the usage period, whereby the operatability of the writing implement may be impaired.
On the other hand, a plastic-foam cushion of the density that is required for the purpose of elasticity has only a limited ink permeability.
In order to achieve, in the case of writing implements of this type, a better capacity for open storage than in the case of the known small-tube writing implements, unpigmented inks must be used instead of pigmented inks. It is known that the latter have a much better covering capacity than unpigmented ink types. In order to nevertheless achieve by means of these ink types a comparable blackening and covering capacity of the produced lines, a more intensive ink delivery is required. However, this more intensive ink delivery, in the case of the writing implement disclosed in DE-OS 30 23 189, is not ensured, mainly as a result of the plastic-foam cushion.


SUMMARY OF THE INVENTION

The present invention is therefore based on the objective of improving the flow of ink in the case of writing implements of this type, and particularly of achieving a higher delivery with respect to the amount of ink relative to the writing path.
In general, this objective is achieved by means of an improvement of the flow of ink into the area of the inner end of the writing implement.
The individual measures are the object of the claims and are in the following explained in detail by means of two embodiments that are shown in the drawing.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an axial sectional view of a writing implement developed according to the invention in the area of the writing point with an outlined closing cap according to a first embodiment;
FIG. 2 is a partial axial sectional view corresponding to the representation according to FIG. 1 of a writing implement according to the invention according to a second embodiment, but without a closing cap;
FIG. 3 is a radial sectional view along the Line III--III in FIG. 1;
FIG. 4 is a radial sectional view along the Line IV--IV in FIG. 1;
FIG. 5 is a radial sectional view along the Line V--V in FIG. 5; and
FIG. 6 is a radial sectional view along the Line VI--VI in FIG. 1.


DETAILED DESCRIPTION OF THE DRAWINGS

In the drawing, only the elements are shown that are required for the understanding of the invention.
Not shown is the ink reservoir located in the rear part of the casing 10, from which the liquid ink, by means of an ink conducting means 11, is transported into the front area of the writing point on the basis of the capillary effect of the ink-conducting means.
A mounting 19 with a coaxially press-in sheath 20 is inserted into the front end of the casing 10. The sheath 20, at one end, receives the front end of the ink-conducting means 11 and, at the other end, carries the writing wick 30 disposed in the small writing tube 32.

REFERENCES:
patent: 2029152 (1936-01-01), Bonkowski
patent: 3113336 (1963-12-01), Langnickel
patent: 3221360 (1965-12-01), Seeman
patent: 3680968 (1972-08-01), Schwartzman et al.
patent: 3832071 (1974-08-01), Chaney
patent: 4145148 (1979-03-01), Fukuoka
patent: 4364684 (1982-12-01), Kohno et al.
patent: 4496258 (1985-01-01), Tanaka et al.

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