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Патент USA US2129409

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Sept 6, 1938-
A. s. A. DE MELO
Filed Dec. 30, 1936
Patented Sept. 6, 1938
Alfredo Silveira Avila de vMelo, Lisbon, Portugal
Application December 30, 1936, Serial No. 118,420
In Portugal September 2, 1936
5 Claims. (Cl. 120—61)
The present invention relates to containers for
writing ?uids or the like and particularly to con
tainers of the type in which attempt is made to
provide a body of writing ?uid of constantv depth
5 for the purpose of insuring the immersion to the
same extent of the point of a pen inserted into
the container from time to time.
The container or, as more commonly expressed,
the inkwell, which comprises subject matter of
10 the present invention includes, in addition to
the usual receptacle for writing ?uid or the like,
a ?oat which normally rests upon the surface of
the writing ?uid, the ?oat preferably having su?i
cient buoyancy to not only support its own weight
15 but to also support the weight of a pen resting
upon the same and the ?oat likewise being so
formed as to de?ne a small reservoir or pocket
for writing ?uid, quite apart from the main body
of writing ?uid in the container, into which the
20 pen may be clipped and in which it will always be
submerged to the same extent, regardless of the
volume or level of the liquid within the reservoir.
The novel inkwell may be designed and con
structed for use with pens of various sizes and.
25 Weights, but preferably is designed for use with
a pen of de?nite size and weight, which pen is
normally positioned with its point resting upon
the ?oat within the container but which may be
readily withdrawn at any time for writing pur
30 poses.
The invention not only provides means for en
suring that the point of a pen inserted therein
shall be immersed only to a predetermined con
stant depth, but so functions to render available
35 for use practically every portion of the body of
ink placed within the container, and this not
withstanding the fact that a very small volume
of ink indeed may remain in the container after
it has been in use some time Without re?lling,
40 the action of the ?oat being such as to force with
in the pen point receiving recess formed therein,
and thus render available for use, the last few
drops of writing ?uid remaining in the container.
the pen while at the same time preventing too
deep an immersion of the pen in the writing ?uid.
One embodiment of the invention has been
selected for disclosure by way of example, and
such embodiment is illustrated in the accompany- 5;
ing drawing, in which
Figure 1 is an axial section through the con
tainer and the enclosed ?oat, a pen being illus
trated in the position which it occupies when being
Figure 2 is a similar View but showing the pen
fully inserted and the ?oat in lowermost position,
with container practically empty of ?uid;
Figure 3 is-a section on line 3—3 of Figure 2;
Figure 4 is a top view of the container, the pen 15,
being omitted in both Figures 3 and 4; and
Figure 5 shows in vertical axial section the
cap or closure of the inkwell.
The containenas has been previously pointed
out, may be formed in various ways, but essen- 20
tially comprises a tubular portion or barrel H],
a bottom I I, preferably slightly. conical as shown,
and a removable top l2 the lower face of which
is also preferably slightly conical, to substantially
the same degree as is the bottom. The top I2 is 25
provided with a central aperture l3 for the in
sertion of a pen, such as the pen indicated at
M, and encircling this aperture and projecting
upwardly from the top I2 is a cylindrical ex
tension l5 provided interiorly with pen guiding 30
ribs I6 and exteriorly with threads I l for en
gagement with the interiorly threaded portion
of the top or closure cap 18 which is normally
positioned to close the container when not in
use. Preferably the container barrel H3 is cylin- 35
drical. Within. the container barrel is a ?oat 20
which may be formed in various Ways and of
different materials but in any case is preferably
so shaped in horizontal section as to be- substan
tially coextensive in area with a horizontal sec- 40
tion through the barrel it, the diameter of the
?oat being only slightly less than the inside di
ameter of thebarrel, to prevent binding of the
The container and ?oat may be varied widely
?oat within the barrel as it moves vertically with
the rise and. fall of the liquid level therein. The 45
in design and appearance, and the invention is
likewise not at all limited with respect to the type
of pen which may be employed. Thus the pen
may be of the fountain pen type or of the ordi
50 nary type without capacity for the storage of
cylindrical inner surface of the barrel i0 is pro
vided with grooves 2!, or the cylindrical outer
surface of the ?oat 20 may be provided with
vertical grooves, these grooves providing rela
tively restricted ?uid by-pass ducts around the 60
' 4
The invention is, however, particularly
suitable for use in conjunction with pens of the
fountain type, the point of any such pen, when
inserted Within the container, resting upon the
55 ?oat in such position as to facilitate charging of
?oat 20.
Centrally the ?oat is provided with an aperture
or recess 22 which extends entirely through the
same from top to bottom thereof and the axis of
which is aligned with the axis of the pen guiding 66
portion l5 of the container. A pen inserted
through the aperture IS in the container top will
be guided by ribs l 6 so that its point will enter the
vent the too rapid out?ow of ink in the event that
the container is overturned, it being possible for
recess 22 and the pen l4 illustrated in Figure 2
is shown in this position, with the annular lower
end surface 24 of the barrel resting upon an annu
through the aperture 22 formed centrally of the
?oat and this ?ow being at a relatively slow rate
owing to the fact that it is di?icult for air to ?ow
lar shoulder 25 of the ?oat, shoulder 25 encircling
the axis of recess 22. Radial grooves 26 maintain
the recess 22 in communication with the space
the ink to escape only around the ?oat 20 or
around the ?oat into the space between the ?oat
and the bottom of the container.
The ?oat 20 may be fabricated of metal or any
10 above the ?oat, even when the pen is positioned
material resistant to writing ?uids or the like and 10
the container itself may be conveniently formed of
The upper portion of recess 22 is generally,“ glass or composition. The entire container is in
as shown.
cylindrical, as shown, and the lower portion is
expensive to fabricate and is economical in the use
generally conical, terminating in a relatively re
of ink when used, the body of ink within the con
15 stricted port 2'! formed in the lower wall or bot
tainer having but little surface at any time ex 15
tom of the ?oat. In vertical transverse section posed to the air. When a pen such as indicated
therefore the recess 22 corresponds substantially at M is normally left in the position shown, a
to the general shape of the pen point 28, su?icient very small evaporation can take place, the lower
clearance being provided between the edges of the 7 end of the pen practically sealing off the upper
20 pen point and the inner surfaces of the'walls of end of recess 22. By shaping the bottom of the 20
recess 22 to ensure that the pen point, when at any
container as shown, and rendering the bottom of
‘time inserted, will not contact with the walls of the ?oat correspondingly conical, the last remain
the recess into which it extends, and quite re
ing drops of ?uid will tend to drain toward the
gardless of the angular relative relationship of port 21 in ?oat 20 so as to pass readily into recess
the pen and ?oat at the time of insertion. The
pen point 28 is likewise slightly shorter than
recess 22 so that notwithstanding the fact that
the ?oat 20 may move downwardly as the ink
level falls, to ?nally come to rest upon the bottom
of the container, the tip of the pen point cannot
at any time strike the container bottom and
thereby be injured, the lower end 24 of the pen
barrel coming to rest upon the shoulder 25 before
the tip of point 28 reaches the lower end of recess
The container may be of course ?lled with ink
until the upper surface of the ?oat is in contact
with the lower surface of the removable top l2.
Assuming the ink level to be indicated by the dot
40 and dash line 30, the ?oat 20 will occupy some
such position as indicated by the dotted lines 3|,
when the pen is at rest upon and is being sup
ported by the ?oat. Falling of the ink level has
no effect upon the extent of immersion of the ?oat
until the ?oat comes to rest upon the bottom of
the container. At all times prior to contact of
the ?oat with the bottom ll of the container,
and when the pen is positioned upon the ?oat,
the upper surface of the relatively small body of
ink within the recess 22 will be well up toward the
top of this recess, for instance at the level indi
cated by the dotted line 33 in Figure 2. Even when
the ?oat 20 comes to rest upon bottom I I as shown
in this ?gure, the level of the ink in recess 22 will
at ?rst be at the elevation indicated by the line 33,
practically all of the ink in the .container having
been forced into recess 22 by the action of the
?oat. Hence it is clear that the ?oat functions as
a piston, making available for use practically all
of the ink originally placed in the container, an
important advantage of the invention. Likewise
the rather closely ?tting ?oat 20 functions to pre
22 when the ?oat comes to rest on bottom I l.
Having thus described the invention, what is
claimed as new and desired to be secured by Let
ters Patent is:
l. A container for writing or like ?uids com
prising a tubular barrel and bottom, and a ?oat in
said barrel, the bottom surface of the ?oat being
adapted to bear upon substantially the entire area
of the bottom of the container when the con
tainer is substantially empty, and the ?oat having
a pen point receiving aperture therein opening to 35
the bottom of the ?oat into which the last re
maining ?uid will be forced by the ?oat when the
?oat reaches its lowermost position.
2. The combination set forth in claim 1 in
which the ?oat approximates, in horizontal sec 40
tion, the shape of the inside of the container, and
in which vertical grooves are formed in the con
tainer barrel for the purpose set forth.
3. A container for writing or like ?uids com
prising a tubular barrel and bottom, and a ?oat in
said barrel, the bottom surface of said ?oat being
adapted to bear upon substantially the entire area
of the bottom of the container when the container
is substantially empty, said ?oat having a pen
point receiving aperture therein opening to the
bottom of the ?oat, said aperture having a di
ameter insu?icient to receive the barrel of a pen,
and being longer than that portion of the pen
point which projects from the barrel of the pen.
4. The combination de?ned in claim 3, said
tubular barrel having guide means at its top for
removably supporting a pen with the axis thereof
vertically disposed.
5. The combination de?ned in claim 3, said
?oat being sufficiently buoyant to support the 60
weight of a pen.
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