Coating implements with material supply – Material flows through porous tool – Wick feed from within reservoir to tool
Reexamination Certificate
1998-05-26
2001-02-06
Walczak, David J. (Department: 3751)
Coating implements with material supply
Material flows through porous tool
Wick feed from within reservoir to tool
C401S198000
Reexamination Certificate
active
06183155
ABSTRACT:
The invention concerns an implement for applying a liquid to a support by means of an applicator element.
Such an implement is known from DE 41 15 682 and will now be described with reference to FIG.
11
.
Provided within a casing
2
is a divider wall
4
, above which a supply of freely movable liquid
6
is accommodated in the casing. Above the liquid
6
is a volume of air
7
which increasingly replaces the liquid as it is discharged.
At its lower end the casing
2
has a tapering front portion
8
with a through opening in which is held a wick
10
terminating in a writing tip
12
serving as an applicator element. Extending laterally beside the wick
10
through the front portion
8
is a vent bore
14
. A storage means
16
of capillary material which closely embraces the wick
10
is accommodated in the space between the front portion
8
and the divider wall
4
. The wick
10
completely fills an opening
18
provided in the divider wall
4
so that only the wick
10
projects into the liquid
6
.
The capillarities of the wick
10
and the storage means
16
are matched to each other in such a way that the capillarity of the storage means
16
is less than that of the wick
10
. It will be appreciated that the wick
10
does not involve a uniform degree of capillarity as it has larger and smaller spacings between its fibers or includes statistically distributed pores.
The important consideration is that the mean capillarity of the wick
10
in the region of the opening
18
is greater than the mean capillarity of the storage means
16
. That ensures that, when passing the implement over a support which is to be written upon with the writing tip
12
, liquid is sucked by capillary action through the wick
10
out of the supply of liquid in the casing
2
on to the support and at the same time air passes into the interior of the casing through the larger pores in the wick
10
, within the opening
18
, in order to replace the liquid which has been discharged in the writing operation. Because the storage means
16
involves a lower level of capillarity or larger capillaries in comparison with the capillaries of the wick
10
which serve for the feed of air to the liquid
6
, the storage means
16
which is directly in contact with the wick
10
is not sucked full with liquid so that its volume is available as a buffer volume if liquid is urged out of the supply of liquid into the wick for example due to thermal expansion of the air volume
7
. In that way the implement of
FIG. 11
is extremely leak-proof in spite of a very large supply of liquid.
A particularity of that device is that the liquid to be applied to a support has to flow through the entire wick
10
, which naturally gives rise to a high level of flow resistance which limits the amount of ink issuing from the writing tip
12
. In practical operation that has the result from time to time that, when writing quickly or when quickly applying liquid, the implement does not give a satisfactory writing or application trace or image on the support.
It is an object of the invention to improve a liquid applicator implement as mentioned above as to permit a satisfactory applying of a liquid to a support under widely varying conditions and using considerably different liquids.
A solution of this object is provided with an implement for applying liquid to a support including; a container for a freely movable liquid; a capillary storage means for temporarily receiving liquid upon a change in air pressure and/or temperature of the environment; an applicator element formed as a writing, drawing or brush tip or a print element; a capillary air inlet for compensation of liquid taken from the container; charaterized in that a passage for conveying bridges partially or entirely over the distance between the container with liquid and the applicator element which passage is not directly in communication with the storage means and is of a lower capillary than that of the storage means.
In the implement according to the invention the liquid does not have to cover a long distance through a medium with a high level of capillarity, but is passes through a passage of low capillarity directly to the applicator element which therefore can be of a correspondingly short configuration and which no longer has a high level of flow resistance in regard to the liquid to be applied to a support, even with a high degree of capillarity.
Accordingly even large amounts of liquid can be applied to the support in a short time with the implement according to the invention, that is to say it is possible to write quickly, print very fast and so on.
Appended subclaims are directed toward advantageous embodiments of the inventive implement.
REFERENCES:
patent: 535588 (1895-03-01), Horton
patent: 1166896 (1916-01-01), Garvey
patent: 3873218 (1975-03-01), Yoshida
patent: 3922100 (1975-11-01), Saito
patent: 4496258 (1985-01-01), Tanaka et al.
patent: 4671692 (1987-06-01), Inaba
patent: 5556215 (1996-09-01), Hori
patent: 2754338 (1979-06-01), None
patent: 39 03 606 (1989-02-01), None
patent: 7907389 (1979-10-01), None
patent: WO 92/20530 (1992-11-01), None
International Search Report; dated Feb. 21, 1997.
German Patent Abstract; p. 2451; WILA-GMA—Heft 47 vom 21.1.
Oppenheimer Wolff & Donnelly LLP
Walczak David J.
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