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Патент USA US2136371

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. Nov. 15, 1938.
L‘ A, BROOKE
FOUNTAIN PEN
Filed Oct. 2, 1936
3
. 55%
‘2,136,371
2,136,371
Patented Nov. 15, 1938
UNITEDSTATES
,
».
PATENT OFFICE
- i 2,136,371‘
. FOUNTAIN- PEN
Lloyd A. l3rooke, Washington, D‘. C;
' lapplicationvoctober 2, 1936, Serial No. 103,760
'
f4 Claims. (01. (120-450)‘
form and carries the feed-plug '! which acts in
the usual manner to support and carry the pen
eration in the simplest form possible, of an op-_ point nib '8 and is of the usual shape- adjacent to
the nib.’ The feed-plug ‘I is ?tted with the con
eratable, perfectly performing ‘fountain pen, car
The invention relates to‘ a new and unique
method or principle in the construction and op-'
D
rying a very large volume of‘ink.
I
~
' The means by ‘which this new and unique meth- ‘
0d 'of ' controlling‘ a ‘very much larger volume‘ of '
ink in the ink chamber of a fountain pen than
has been here-to-fore ‘possible, consists general
10
‘ly‘ of:
-
‘
'
or more narrow canals ID, as required, ending ‘at
the'nib end in the usual manner at l2. The duct’
9 at its upper end terminates in the vertical wall
at I3 of an enlarged cylindrical head l4 on the
upperend of the feed-plug ‘I. The head [4 is 10
A feed plug, the-drum like shaped head of
seated on the connection 6 at I5~and is of a
which is cylindrical with'a ?at or concave top;
diameter such as to form a canal [6 with the in
side of the barrel or ink chamber, of compara
tively small surface area. The head l4 must be
the‘height and diameter of which, in its proper
relation to the side wall of the barrel ink cham
'-‘ her is such, that it provides varound the cylin
drical head of the feed plug, a circular canal
open at the top, and continuously'?lled with ink
by the ink chamber; but so stably controlled by
the height and diameter of the cylindrical feed
plug head in its relation to the side wall of the
barrel ink chamber, that the air pressure and the
head of the very large volume of liquid in the
ink chamber is so controlled by the canal men
tioned as to provide and allow a steady flow of ink
at a low pressure to the longitudinal feed duct,
in the feed plug, leading from this canal through
the cylindrical wall of the feed plug to the pen
point, and may be used to the last drop of ink
in the ink chamber without flooding.
By this proper adjusted construction of the
30
height and diameter of the cylindrical head of
the feed plug to the side wall of the barrel ink
chamber, any practical large body of ink can be
perfectly controlled so as to prevent ?ooding.
The practical limit is that ink volume that does
not make the pen too- heavy for the writer to use
comfortably.
The invention is illustrated in the accompany
ing drawing, in which:
40
ventional rectangular ink feed-duct 9 having two , CH
Fig. 1 is a sectional elevation of the pen, in the
closed position.
Fig. 2 is a cross section of the pen with cap
removed, the section being taken on the line 2-—2
of Fig. 1.
A practical embodiment of the invention is dis
4.5
closed in the drawing, in which similar numer
als of reference indicate corresponding parts
throughout the several views as follows:-—|
The barrel I, ink chamber, may or may not be
50 formed of a transparent material. The writing
end of the barrel l is externally threaded to re
ceive the cap 2 and is internally threaded to re
ceive the connection 6 or, the joint may be made
by friction and secured by any suitable means.
The connection 6 is, in general, of the usual
55
designed of the proper height and diameter in§l5
relation to the side wall of the barrel, ink cham
bar, to meet the desired conditions and is ?tted,
with-a ?at or concaved top at IT. ~ As an example
for a pen designed to hold an ink column of five‘
inches in height the height of the head should be 20
about ?ve-sixteenths of an inch from shoulder 13
to top of head; the canal l6 between the head [4
and the wall of the barrel I may vary from about
one and one-half hundredths of an inch up to
about three hundredths of an inch in width with 25
satisfactory results.
The arrangement thus formed, creates a meth
od whereby larger ink volumes, here-to-fore
found impossible to provide and operate prop
erly, can be supplied, supported, and give 'a 30
smooth continuous perfect performance.
This
method of control of the large volume of ink is
unique in that it allows the handling of a head
up to (5) five inches in height with a capacity
of at least (6) six cubic centimeters, more ink
than could be carried in the largest practical
sized pen, as well as allowing the use of the
last drop of ink with perfect'performance. The
friction set up in the small canal of liquid at
IS; the arrangement of the duct end at l3; the 40
enlarged properly designed head l4, and the
capillary attraction in the rigid side walls of the
barrel or ink chamber, combined, react and over
come su?iciently the action of the ink head and
the pressure due to the necessary air space 45
above the maximum ink height, including any
increase in air pressure due to the warmth of the
writer’s hand.
_
From the foregoing description taken in con
nection with the accompanying drawing it is 50
thought the construction, operation and advan
tages of the invention over those of the prior art
will be apparent to those, skilled in the art.
What I claim is:
-
1. In a fountain pen, a barrel having an ink 65
2
2,136,371
chamber, a feed plug immovably held in one
end of said barrel, a pen nib held in place by said
plug, said plug having a cylindrical head of a
greater diameter than that of the body of the
plug and being located within the barrel the
side wall of which head is approximately paral
lel to the adjacent wall of the barrel and spaced
slightly therefrom to leave an annular capillary
space between the plug and the barrel, said plug
10 having a duct with canals, the outer end of which
duct terminates adjacent said nib and the inner
end of which duct opens through the side only
of said head into said capillary space below the
top of said head.
15
2. In a fountain pen, a barrel having an ink
chamber, a feed plug immovably held in one end
of said barrel, a pen nib held in place by said
plug, said plug being composed of a body having
a cylindrical head located in the ink chamber,
the adjacent wall of the barrel surrounding said
head being also cylindrical and being spaced
from the adjacent wall of the head a relatively
slight distance thereby forming with the head
an annular capillary space alongside the head
from one end thereof to the other, said plug
having a ‘duct along its upper side with canals
whose outer end terminates adjacent said nib
and whose inner end terminates in an opening
through the top side of the head only adjacent
30 the outer end of the head.
3. In a fountain pen, a barrel having an ink
chamber of relatively large capacity, a tubular
member having a bore of lesser diameter than
that of the barrel and having one end shoul
co Li dered and threaded into the outer end of the
barrel, a feed plug comprising a body of two
diameters, that part of lesser diameter consti
tuting a shank ?tted immovably in said tubular
member and that part of greater diameter con
stituting a head the side wall of which is cylin
drical and extends into the outer end of the bar
rel in close proximity thereto throughout the
length of said head thereby to provide an an
nular capillary space, a pen nib held in place by 5
said plug, said plug having a duct along its top
side, with canals, whose outer end terminates
adjacent said nib and whose inner end termi
nates at the commencement of said head, said
head having a side opening only adjacent the 10
inner end of said portion of lesser diameter and
registering with said duct.
4. In a fountain pen, a barrel having an ink
chamber of relatively large capacity, a tubular
member having a bore of lesser diameter than
that of the barrel and having one end shoul
dered and threaded into the outer end of the
barrel, 2, feed plug comprising a body of two
diameters, that part of lesser diameter consti
tuting a shank ?tted immovably in said tubular
member and that part of greater diameter con
stituting a head the side Wall of which is cylin
drical and extends into the outer end of the
barrel in close proximity thereto throughout the
length of said head thereby to provide an an
nular capillary space, a pen nib held in place
by said plug, said plug having a duct along its
top side, with canals, whose outer end termi
nates adjacent said nib and whose inner end
terminates at the commencement of said head,
said head having a side opening only adjacent
the inner end of said portion of lesser diameter
and registering with said duct, the cross—sec
tional area of said duct being greater than the
width of the capillary space measured from the
outside of the head to the adjacent inside sur
face of said barrel.
LLOYD A. BROOKE.
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