U.S. patent number 3,744,923 [Application Number 05/178,367] was granted by the patent office on 1973-07-10 for pen with improved ventilation for its ink reservoir.
Invention is credited to Edward Bok.
United States Patent |
3,744,923 |
Bok |
July 10, 1973 |
PEN WITH IMPROVED VENTILATION FOR ITS INK RESERVOIR
Abstract
Writing or drafting pen of the type having an ink reservoir, a
vent system upwardly extending from the lower end of the pen to the
top of said pen and in said pen a supply source of vapor to prevent
the clogging up of said vent system with dried ink.
Inventors: |
Bok; Edward (Badhoevedorp,
NL) |
Family
ID: |
42238818 |
Appl.
No.: |
05/178,367 |
Filed: |
September 7, 1971 |
Foreign Application Priority Data
|
|
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|
|
Sep 8, 1970 [NL] |
|
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7013334 |
Nov 3, 1970 [NL] |
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7016060 |
Dec 14, 1970 [NL] |
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7018180 |
Jan 26, 1971 [NL] |
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7101029 |
Jun 16, 1971 [NL] |
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7108297 |
Jun 23, 1971 [NL] |
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7108645 |
Jul 23, 1971 [NL] |
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7111159 |
Aug 13, 1971 [NL] |
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7111433 |
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Current U.S.
Class: |
401/265;
401/258 |
Current CPC
Class: |
B43K
8/18 (20130101); B43K 8/16 (20130101); B43K
23/12 (20130101); B43K 5/1845 (20130101) |
Current International
Class: |
B43K
23/00 (20060101); B43K 23/12 (20060101); B43K
5/00 (20060101); B43K 8/00 (20060101); B43K
5/18 (20060101); B43K 8/16 (20060101); B43k
005/04 (); B43k 001/10 () |
Field of
Search: |
;401/258-260,223,198,199,165 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Charles; Lawrence
Claims
I claim:
1. A pen, comprising:
a barrel,
an ink reservoir within said barrel,
a pen point at the lower end of said barrel and in communication
with said ink reservoir via capillary tubing,
venting means extending upwardly from the lower end of said
revervoir, and
a buffer within the lower end of said venting means for collecting
ink received from said reservoir, said buffer comprising a
plurality of separated, non-capillary channels.
2. A pen as in claim 1, including a second buffer within said
venting means comprising a plurality of narrow channels and a
communication chamber interposed between said buffer and said
second buffer.
3. A pen as in claim 2, wherein said buffer further comprises a
bottom member provided with a central venting channel.
4. A pen as in claim 3, whereby said venting means includes an ink
absorber comprising a plurality of capillary passages.
5. A pen as in claim 4, wherein said ink absorber includes a liquid
vaporizable under room temperature.
6. A pen as in claim 5, wherein said barrel comprises upper and
lower sections, said upper section comprising an exchangeable ink
reservoir and the upper portion of said venting means.
7. A pen as in claim 6, including a cap of flexible material
positioned to seal off said upper portion of said venting means,
said cap including a longitudinally extending portion capable of
being punctured but normally being closed.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
Drafting or scribing pens are conventially provided with an ink
reservoir, a writing point communicant with the reservoir and a
vent channel for the ventilation of this ink reservoir.
Major difficulties have occurred in the clogging up with dried up
ink of this vent channel with eventually a complete sealed off pen
interior. As a result differences in temperature of the pen
interior cause an irregular ink pressurization of the ink in the
pen point with unavoidable and unallowable leaking of ink in the
form of droplets out of such writing point.
A periodic cleaning of such vent channel is difficult and time
consuming and whereby, due to such cleaning proces, too easily
dried up ink particles might collect in the ink reservoir and more
or less might disturb the carrying off of ink through the ink
passage of the pen point.
SUMMARY OF THE INVENTION
According to the present invention the pen barrel is provided with
an ink reservoir and a vent system, which upwardly extends from the
lower end of the pen to the top of said pen, in said vent system a
buffer for the collection of ink, forced therein from the ink
reservoir, said buffer having a plurality of buffer channels with a
maximum contact surface between the venting air and the ink and
thereby acting as the main supply source of vapor, which vapor
prevents , in combination with a seal-off structure for said vent
system, the clogging up of said vent system with dried up ink.
Furthermore, a multi channeled ink absorber is positioned in said
vent system on top of said buffer for the collection therein of
ink, which is expelled from the buffer channels, said buffer and
ink absorber being part of an exchangeable throw-away buffer unit,
which unit as the lower part of a divisible vent system is located
in the lower part of said pen. Furthermore, an exchangeable
throw-away ink reservoir with the upper part of said vent system
located therein and being the the upper part of said pen.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an enlarged vertical sectional view of the pen according
to the invention;
FIG. 2 is a transverse sectional view of the pen taken along
section line 2--2;
FIG.3 is a vertical sectional view of the upper end of the pen
according to FIG. 1 with a protective cap connected thereto;
FIG. 4 is a transverse sectional view of the pen of FIG.3 taken
along section line 4--4;
FIG. 5 is in part a side view and vertical sectional view of the
exchangeable ink reservoir of the pen according to FIG. 1;
FIG. 6 is a detail of the sealing-off structure for the pen tip of
a drafting pen; and
FIG. 7 is a detail of the sealing-off structure for a pen nib,
which is provided with a fibrous pen tip.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1 pen 10 is shown. This pen consists of barrel 12 with nib
14 and tip 16, ink reservoir 18, which by means of a screw thread
is connected to barrel 12, vent system 20 and protective cap
22.
The vent system 20 consists of buffer unit 24, which with a slight
press fit is secured in the interior of barrel 12, and the vent
tube 26 provided with sealing-off cap 28, which combination is part
of the ink reservoir 18.
The buffer unit 24 consists of 30 with buffer channels 32, bottom
34, which is attached to this unit and which is provided with
central vent channel 36, ink absorber 38 for the absorbtion of ink
40, which is expelled from the buffer channels 32 and ink lock 42,
which consists of a plurality of narrow capillary channels 44.
By means of buffer unit 24 the cleaning wire 46, together with
cleaning wire weight 48, is displaceably enclosed in chamber 50 of
pen nib 14. The cleaning wire 46 is thereby longitudinally
displaceable in the ink passage 52 of pen tip 16 and whereby its
weight 48 comprises seal valve 54 which, if resting upon the bottom
56 of pen nib 14, accomplishes the sealing off of ink passage
52.
The tip 16 is part of pen nib 14, which is made of synthetic
material and is provided with sealing-off flanges 58 and 60. If
protective cap 22 is attached to barrel 12, pen tip 16 is located
in chamber 62 of cap 22 with the established sealing-off of this
chamber by means of said flanges 58 and 60, which are urged against
the inner wall 64 of chamber 62.
Furthermore, as a result of the urging of seal rim 66 of cap 22
against the lower end 68 of barrel 12, a second seal is obtained.
During non-use of the pen 10, this combination of seals provides an
effective sealing-off of the ink passage 52 of pen tip 16.
Ink reservoir 18 contains bottom piece 70, which in upward
direction is displaceable over vent tube 26. This displacement is
accomplished by means of upper end 72 of buffer unit 24 whereby the
connection between bottom 70 and sidewall 74 of the ink reservoir
18 is broken by connecting the ink reservoir 18 and the interior of
barrel 12.
Cap 28 is made of flexible material and is provided with a
centrally disposed puncturable opening.
Protective cap 22 is provided with a puncturing vent pin 78
provided with venting groove 80 and jacket 82. Cap 22 is securable
to the upper end of ink reservoir 18 when the pen 10 is being used,
as seen in FIG. 3. In this position vent pin 78 extends through
puncture 76 whereby via buffer unit 24, vent tube 26, vent groove
80 of pin 78 and vent openings 86 in the side-wall 84 of cap 22
established communication between the interior of pen 10 and the
outer atmosphere is established.
In FIG. 6 pen tip 16' is part of a drafting pen and whereby flanges
58' and 60' are part of pen nib 14'.
In FIG. 7 pen tip 16' is a fibrous product. Within the scope of the
invention other structures for the pen tip are possible.
* * * * *