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Dec. 31, 1946.
Filed June 12
Patented Dec. 31, 1946
2,413,457" _ ‘ i Q
Roy D. Heymann, New Hartford, Conn, assignor,
by mesne assignments, to Animal Trap Com
pany ofrAmerica, Lititz, Pa... a corporation, of
ApplicationJune 12, 1943, Serial No. 490,578
3 Claims.
This invention is concerned particularly with
the manufacture, from so-calledsynthetic rubber
or'arti?cial rubber, of self-sealing cells for con;
taining liquid fuel; although it is not limited to
that ?eld. Its purpose is‘, to provide relatively
inexpensive and easily constructed forms for use
in, the building of such cellsv and vfor analogous
((31. 18-45)
‘ tion, for withdrawal piece-meal from the form,
and of being afterwards reassembled for repeated
use. Such forms, however, are very expensive to
build, and they are large and heavy, running to
. a weight ofv 1,000 pounds or more when designed
for it, I will now brie?y describe the present usual
for making cells of large dimensions. They 'are
also unable to withstand the effect of heat used
for'curing the sheet material and warp. Thus,
even though capable of repeated use, the number
of usesi'sverylimited, as warping prevents dis
assembled pieces from being correctly put to
gether-and alters the dimensions and shape of
procedure of making, puncture-sealing cells and. ‘
the entire form.
Having regard to the, purposes above indicated,
but without intending thereby to limitthe scope
of the invention or the protection hereby claimed
vForms of the other type 'are'made of plaster of
the formsemployed in connection therewith, as
background, before describing the present in 15 Paris’cast’in molds'to therequired contours and
The tanks in which the fuel supply of airplanes
and some other self-propelled war engines is con
tained, are provided with linings or inner con
tainers made of materials which are capable of 20
closing punctures caused by bullets and projec
tiles. Generally the material of which such lin
ings or containers are made is one of the so
called synthetic or arti?cial rubber compositions
which are largely inert to the action of gasoline
and oils. In the case of large tanks a number
of separate containers or cells are placed within
the tank structure in intercommunication. The
term “cell” is here used as a generic term to
They also are expensive to make
and are even heavier than the wooden forms.
They are incapable of repeated'use, for each form
must be broken up after the cell has been cured
in order to permit removal from the cell, and
once broken the form is useless and the material
is worthless.
In accordance with the present invention, I
have provided forms made of pulp material to
serve the purpose indicated. The pulp used may
_ be of any of the grades and compositions suitable
for making paper. It may be composed of vari
able proportions of chemical and mechanical
pulp,_ for instance from 30% to 40% of chemical
include all units which are used either singly or 30 pulp and 70% to 60% of mechanical pulp.
The pulp is cast in a hollow foraminous mold,
in multiple as the primary containers for gaso
being delivered to the mold in a water suspension
lene, etc., in the environment indicated. Such
containing enough water to make it ?ow freely.
cells may have more or less irregular shapes and
It is continuously supplied to the mold under a
contours suited to the limitations of the spaces
pressure head, while the water continuously seeps
in which they are located. They are customarily
through the multitudinous perforations in the
built out of strips or sheets of the rubber com
lining of the mold and through the accumula
position in plastic condition, laid on the exterior
tion of ?bers on the inner surface of the mold
of a form which has the required contours of a
lining until the walls of the casting have been
given cell, so as to envelop the form. Adjacent
built up to a thickness suf?cient to withstand the
edges of the component sheets and pieces are
forces applied in building up a tank cell. , Owing
overlapped, or abutted and overlaid by tapes, to
to the pressure applied to the entering pulp, and
_make a continuous fabric. The plastic structure
the impedance to escape of water through the
thus fabricated is cured under heat to elastic
small perforations in the mold walls, ?bers are
?rmness while still surrounding the form.
In most cases the cells made in this way en 45 lodged against all of the interior surfaces of the
mold to nearly uniform thickness throughout.
velop the forms except for an opening of smaller
Such thickness is determined and regulated by
dimensions than those of the largest side or the
the length of time that pulp is delivered. When
cross section of the form, wherefore the form can
enough pulp has been thus delivered‘ to make
not be withdrawn as a unit from the ?nished cell
but must be dismembered into parts small enough 50 walls of the desired thickness, the pulp supply
is shut off and air admitted under su?icient pres
to pass through the opening. Previously two
sure to compact the deposited ?bers and expel
types of forms capable of being reduced to dis
free water.
connected pieces have been used. The forms of
If desired, the air supply may be continued
one of these types are made of wooden sections
capable of being taken apart, without destruc 55 long enough, and may be heated additionally, to
evaporate the residual water while the pulp
deposition remains in the mold. Or the pulp
casting may be removed while still damp and
otherwise dried. It will be understood that the
molds provided for this use are sectional and
built of a su?icient number of disconnectible
values required for the cell to be made on the
This form, like those previously used, must be
removed in fragments after the tank cell has
arranged to permit disassembling and removal
been completed and cured. But little loss or
waste is involved in thus destroying the form.
The fragments can be returned to the beater for
reconversion to pulp or, if this is not feasible,
from the casting without injury to the latter.
they, can be applied to other uses as, for in
parts with parting lines‘ between them suitably
The pulp is beaten su?iciently to make a uni 10 stance, fuel torgenerate steam power or heat.
form suspension of ?bers and water and to
They are much less expensive to make than
hydrate the ?bers enough to cause them to mat
forms of comparable dimensions of the prior
and felt together ?rmly in the mold. 'Dif?erent
types and have only a small fraction of the
degrees of hydration may’ be imparted to’ the
weight of such forms.
different kinds of ?bers in the mixture. Precise 15
details of duration of beating are not of the es
WhatI claim and desire to secure by Letters
Patent is‘: '
sence of this invention, ‘for considerably wide
1. A form for use in the manufacture of self
variations are possible, and any ?bers and modes
sealing tank cells, consisting of a unitary hollow
of treatment which will produce ?rm, tough and
body‘ of felted ?bers such as are suitable for
strong castings, are within the scope of the in 20 making paper.
2. A hollow form constructed of interfelted
The result of the procedure thus described is a
paper pulp ?bers with the dimensions and con
hollow form, of which a typical example is shown
tours of the interior of a prescribed self-sealing
in the drawing.
In the drawing-—
tank cell, therwalls of said form being integrally
Figure 1 is a perspective view of the exemplary 25 united at their junctions by the 'constituent fi
bers of the structure and being of suitable thick
Figure 2 is a cross section thereof on the line
ness and stiffness to support sheets of vulcaniz
2-2 of Figure 1.
able composition and to withstand Without per
The form as a whole is designated by the ref
manent de?ection the pressures applied to effect
erence letter a. It, may have‘ an opening by at 30 adhesion of- overlapping portions of such‘ sheets.
any point desired in any of. its walls, or‘ maybe ,
3. A form for use in the fabrication of hollow
made, without any opening. The dimensions,
‘articles of vulcanizable compositiomsaid form»
proportions and contours of the form are com
' consisting of a unitary hollow body of felted
plemental to the interior dimensions, etc., of the
?bers such as are suitable for making’ paper. ‘L
mold in, which it is cast, and may be of any‘ 35
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