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Патент USA US3093122

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`lune 11, 1963
3,093,l 13
Filed sept. 24, 1959
Andres S. Hey/:oso
Patented June 11, 1963
A better understanding of the invention will be ob
tained with the aid of the enclosed drawings, in which:
Andres S. Reynoso, Valdivia, Chile
FIG. l »is an enlarged perspective diagrammatic view
of a bichrornic nib according to the invention, adapted
Filed Sept. 24, 1959, Ser. No. 842,034
5 Ciairns. (Ci. 1Z0-42.16)
to be used in a fountain pen according to the invention;
FIG. 2 and FIG. 3 are transverse sections of the nib
shown in FIG. 1, taken along the lines II-II and III
The object of the present invention is to provide a
III; there being no scale relation in the drawings.
fountain pen which can write with two inks or writing
FIG. 4 is on a much larger scale, a diagrammatic lon
fluids `of different colors and, more especially, to provide
such a pen that allows writing to be carried out at will 10 gitudinal section of the bichromatic nib of FIG. l, the
plane of section being normal to the longitudinal separat
and at any moment, in either color of writing iluid or
ing wall of said nib;
ink, without need for any operation other than that
of rotating the fountain lpen within the fingers of the
FIG. 5 is a diagrammatic longitudinal section of the
fountain pen of the invention taken in a plane normal
hand through an arc of 180°.
Several attempts have been made to produce fountain 15 to the longitudinal separating wall of the nib;
FIG. 6 is a view showing another embodiment of one
of the ink sacs of the fountain pen of the invention; and
FIG. 7 shows, in section, a cap for the fountain pen, in
pens which write, at will, in two or more different colors
of ink. In some, different nibs are singly fed for each
color of ink, but this tends either to produce a rather
voluminous pen, or else ythe ink sacs have to` be too
dicating details of the improved clasp.
small. In other types, a single nib has been provided 20
and fed, as preselected, from two or three ink sacs, of
different colors, and the feeding is selectively controlled
by some valve device, which allows only the preselected
color of ink to feed the nib, at any one time. This
type of pen has the serious inconvenience that, at the
moment of changing one color of »ink for another, a
mixture of both ink colors takes place in the nib, and
this contaminated mixture has to be eliminated by Writing
with this pen, for a few moments, on some other Writ
ing surface which can be discarded.
In the fountain pen of the invention this drawback has
been eliminated, together with several other disadvan
tages, by the use of a double `or bichromatic pen nib of
The shape `of my nib may be visualized by imagining
a nib formed by the placing together of two ordinary
pen nibs, back to back with the points coinciding, but
with the nibs separated by a thin partition wall. The
usual slits at the end of conventional nibs are eliminated
and replaced by a thin capillary slot, or channel, along
the inside dorsal portion of each nib. This provides each
side of said nib with a suitable ink feeder.
The bichromatic nib will write on whichever side of
the point of the nib is in contact with a sheet of paper
30 or other writing surface, while said partition wall is kept
substantially parallel to the line of writing.
If we now
rotate the pen about its own axis for 180°, by merely
turning it within the fingers of the hand, the point fed
by the feeder that was previously uppermost, will now
special construction, which allows writing to be car
ried out continuously with one color of ink and permits 35 come in contact with the paper or writing surface, and
writing will immediately take place in the color that
writing to be carried out at any desired moment with
was loaded into the other sac which feeds this side of
the other color of ink by merely turning the pen within
the nib. Advantages of such a nib will be obvious by
the fingers of the hand, for 180° around its own longitudi
nal axis, after which the pen will immediately write in 40 merely -stating a couple of examples, as for instance, ease
of underlining in the text that was written, or making
the other color of ink or writing fluid, no mixing what
words stand out by using another color of ink, all of
soever of the two colors having taken place at any mo
which can be carried out with no loss of time. This
type of construction gives the nib, likewise, sufiicient solid
For ñlling the pen with two different colors or kinds
of ink or of writing liuid, novel and suitable means are 45 ity to permit carbon copies of the writing to be taken
at the same time, and this has not been possible with
provided, which allow it to be filled, without dipping the
nib in an ink bottle or other source, and thus no con
prior art pens other than the so-called “stylographs,” since
tamination of -ink colors can take place Within the nib.
the `known nibs have an excess of ñex-ibility. It will be
observed, in any case, that at no moment do the two
to provide a fountain pen which can be used to write al 50 ink colors come in contact with each other, neither have
It is, therefore, the principal object of >the invention,
ternatively with either of two colors of ink or> writing
any valves to be manually moved in order to obtain the
fluid, that is to say, a bichromatic fountain pen, which se
lectively uses one color of ink at a given moment, and
employs a single nib built as a unit.
change in color `of the writing.
Such a bichrornatic nib is shown in FIGS. l-4, where
in 11 is the thin partition wall of separation, 12 is one
It is another object of the invention, to provide im 55 of the nibs with its yback in contact with said partition
Wall, in the ycase of the figure, the upper one .and 13
proved means for filling 'such a fountain pen with inks
is .the other nib. All this part is manufactured 'as :a sin
or writing iluids of different colors without any inter
gle piece, and 14 indicates lthe «capillary grooves or ch-an
contamination of said inks or Writing fluids taking place,
nels which `are used instead of the -usu-al slit of ordinary
because the bichromatic nib is not dipped in an ink bot
tle or other source of ink or writing fluid when filling 60 nibs. Each partial nib has its own capillary groove or
channel. 15 indicates the writing point proper, land ‘has
the fountain pen, since the ink sacs of the fountain pen
the shape of `a very small ball with two opposed grooves.
of the invention can be filled independently of the foun
Seen from in front under 'a magnifying glass, the point
tain pen itself.
has a shapesomewhat similar to an upper case letter
And finally, another object of the invention is to pro 65 H. Tlhe writing point is made of some sui-table hand
vide an improved clasp for holding the fountain pen se
material, such as iridium or alloys having simi-lar prop
curely inside the edge of a pocket, which permits easy
placing of the fountain pen in such a position that the
The complete b-ichromatic nib is placed Within a plug
pen will be held securely and efficiently, and yet said
16 of desired shape. The thin partition wall may be
clasp has a much longer life than that of ythe clasps used 70 allowed slightly to protrude from the sides lof this plug,
in order that it may seat more ñrmly within a pen tip
at present, and this is obtained by means that are simple
17 which forms p-art of 'the pen case, and which has
and of low cost.
a protruding base with external screw threads 19 for
receiving a cooperating screwed part of the fbody proper
20 of the fountain pen.
Ink may be supplied to .the Ibichromatic nib by means
of any of the following arrangements.
In the first embodiment, each ink feeder comprises
the inking end 23, a groove 24 which forms with the
usual between thumb and middle finger, the index finger
may easily press on the push button part 35, and this
opens the clasp away from cap 32, and the pen will drop
easily into its place on .the side of the pocket, for ex
ample. On removing the hand, the clasp »closes firmly
due to the tension of spring 37. As a preferred con~
struction, this clasp may be provided with a small metal
corresponding nib groove 14, an ink delivering duct
disk or plaque 49, of any suitable or desired shape,
supplied through the tube 25, which ends in a suitable
which may serve as a base for decorative purposes, or
nipple 26 for receiving one end of a flexible ink sac 27. 10 for mounting thereon shields, emblems or other devices
One feeder' 23 fits between each side of the nib and
which will serve for personal adornment, or may ‘be
the tip 17, the fit being slightly conical in order that the
destined for advertising, identification, membership badges
feeder with its attached ink sac can easily 'be Withdrawn
or any other purpose of similar nature.
In this embodiment, when it is desired to
The embodiments disclosed ‘have been described by
fill each sac with ink or Writing fluid, of a Ágiven or
way of illustration and not of limitation, so that sev~
preselected color, the fountain pen is unscrewed at the
screwed joint 19, the corresponding ink sac is removed
together with its feeder, the feeder end is placed in the
eral modifications or variations may be introduced there
in without departing from the spirit and scope of the in
What is claimed is:
ink bottle or source and the sac compressed with the
fingers, much like filling an ordinary dropper, and thus 20
the sac will fill with the ink or fluid and, once filled,
1. A bichromatic fountain -pen for selectively writing
with either one of two different colors, comprising a uni~
the feeder is put back in its place in the fountain pen
and the pen body screwed back in its place. Thus at
no time has the bichromatic nib ybeen introduced in the
ink source, which would allow this same color of ink
to wet the inner surface of the other nib side which is
tary double nib, having the shape of two ordinary nibs
positioned back to back with a thin dividing wall there
beween, and provided on each side with a capillary groove
or channel, the Itip of said nib being in the form of a
small lball made of suitable hard .metal and fed on each
side by a sepanate iiuitd feeder, each feeder 'being con
nected to ‘a separate flexible sac for storing the writing
to work with the other color of ink or fluid. Conse
quently, no color contamination can take place.
1n a second embodiment, illustrated in FIG. 6, greater
fluid, anda casing encircling said nib, feeders and sacs.
rigidity is given to the inl: sac by placing over the sac 30
2. A ‘bichromatic fountain pen as in claim 1, character~
around the nipple 26, a thin metal ring 21 which car
ized by the fac-t that the ink feeders are dísmountable from
ries a thin metal strip 22 bent -to an acute angle at the
the remainder of the pen for cleaning purposes, and said
extreme upper end of the sac, as at 23, so that its end
flexible sacs may be factory prelilled, and are adapted to
portion 2S returns down the sac on its other side to
be operatively positioned on the feeder ends as needed.
about 3A of the length of ythe sac. This greater rigidity
3. A «bichromatic fountain pen as claimed in claim 1,
of the sac tends to facilitate the filling operation already
«characterized by the fact that each ink feeder together
described and may be preferred by many users of the
with its corresponding ink sac is removable as a unit from
the remainder of the pen for filling with ‘a writing fluid.
fountain pen of the invention. Filling is now done by
squeezing together metal strips 22, 28.
4. A bichrornatic fountain pen as in claim 3, charac
The fountain pen of the invention may be placed con 40 terized by the fact that each flexible sac is enclosed for
the greater part of its length Within a thin metallic strip.
ventionally within a pen case 20 which trnay have its
5. A bichromatic fountain pen for selectively writing
corresponding cap and, if desired, may have -a conven
with either one of two different colors of ink, said pen
tional clasp to hold it in place in the pocket or against
comprising a unitary double nib having the shape of two
a suitable portion of the wearing apparel. The pen may
ordinary nibs positioned iback to Iback, each of which is
be provided with suitable markings to indicate the colo-r
provided on its outwardly facing surface with a longitudi
of the ink Ior fluid that is available for use in a given
nally extending capillary feeding groove completely sepa
position of the pen, -by mere inspection. Such markings
will preferably be on the outside of the pen point of
rated ifrom the outwardly facing surface of the other,
the fountain pen.
The pen cap may, however, be made in »accordance
said nib terminating in a single ball to which said grooves
lead a separate fluid feeder for each groove, each fluid
feeder being connected to a separate ñexible supply sac
with another embodiment which also forms part of the
present invention. -It is well known that present day
clasps, of the laminated spring type, are yawkward when
for storing a writing fluid, and »a casing within which said
double nib, feeders and sacs are mounted.
putting the pen on the edge of a pocket, say, and it is `a
fact that said clasps get deformed very easily, open out, 55
References Cited in the tile of this patent
and even break away. This is overcome in the present
invention by means of a simple construction which is
indicated diagrammatically in FIG. 7, in longitudinal
At 31 we see a soft plastic insert which serves to pro
tect the nib when the cap closes the pen. One side 32
of the cap is shaped to an inclined plane, and the clasp
proper 33 is located against this plane, the clasp being
adapted :to pivot at 34 yon the side of Ithe cap, as seen
in the figure. At its upper end, the clasp termina-tes in 65
a push button 35. The insert 31 'holds in place a disk
36 which supports a spiral spring 37 compressed so that
its other end acts on the inner part of the clasp 33, to
keep the clasp 33 firmly pressed against «the cap 32. How
ever, when pocketing the fountain pen, holding it as 7 O
Greenfield __________ __ May 7,
Wilson ______________ __ Dec. 3,
Grzyb ______________ __ Dec. 12,
Hirth ________________ __ Ian. 24,
Salz ________________ __ July 14,
Wade et al. __________ __ lune 19,
Marshall ____________ __ Oct. 19,
Mott ________________ __ Nov. 5,
Rebas ______________ __ May 24,
Germany ____________ __ July 1, 1943
Switzerland __________ __ Sept. 15, 1950
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