Патент USA US2591417

April 1, 1952
A. >ELMENDORF
2,591,414
FORM FOR USE IN MAKING CEMENT--FIBER BOARDS
Filed Aug. 5 .
1950
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Patented Apr. l, 1952
2,591,414
UNITED STA-TES PATENT
2,591,414.`
FORM Fo?-usEÍIN MAK-iïNdfcEMEÑTA ‘
FIBER Bomans
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1
t The present invention relates to` forms' or
molds particularly adapted for use in a continuous
process of making so-called‘cement-,fiber board,
although it is not confined to‘ that specific use.
The primary purpose of the inventiontis to
permit wood or other organic flbers‘that maybe
several inches long and are coated with _a Port
land cement or gypsum binder to be fashioned
into board material of predetermined width `and
indefinite length which is cut into individual
panel lengths; each panel remaining-‘in an _indi
vidual form until cured or set. In this way every
panel may be of uniform texture from one end
to the other and, after being molded,` it is pro
tected >against damage until it becomes> >strong
the forms arranged end to end to‘ create a> single, “l
long trough-like form; Fig. 5 is a side `view, on
the same scaleas Figs. 1-3, showing fragments
of two of the forms which meet in Fig. 4; Fig. `6
is an> end view of a fragmentV of a form provided
with aI wear-resisting lining; and Fig. v'I is an end
view of `a fragment of another modified form.
Each form is composed of a flat bottom wall I
and two »parallel side walls, 2 `and 3. The side
walls are preferably 'sturdy‘ledges or bars and
are somewhatv shorter` than` the bottom wall.
In the arrangement shown the side walls termi
nate at equal distances from> the ends of the bot
tom wall. Therefore,` when two of the forms are
placedend to end,fregardless of which end of one
meetsthe other form,'sirnilar` slots or gaps, 4, 4,
respectively, appear inthe side walls of the com
and-hard. Due to the nature of the forms used
heretofore for such products there have always
been large variations in the texture and density
posite form,V directly opposite each other. The
of the individual boards or panels at their'4 ends
bottom ,wall isxpreferably rabbeted transversely
and edges; Aand therefore such boards have »not 20 beyond the ends of the side walls, as at 5, so that
been- commercially satisfactory.
‘
In carrying Vout my invention I construct a
whentwo forms vare placed‘end to end, the slots 4
are, inH effect, continued down into the 'bottom
wall of the composite mold. Withthis arrange
ment the saw teeth may project down below the
lower lface Vof the mat duringthe sawing‘opera
form- _composed of only a bottom Wall fand two
parallel side walls, so` that the mold cavity is
open-at> the top and at both ends. Anynumber
of forms may be placed end to end to provide a
troughof any desired length. The forms are so
In the under side‘of the bottom wall are rab
constructed that the continuous sheet mayîbe
betsA 'that reduce> the marginali portions la; at
cut across the width thereof by rapidly `moving
opposite sides, in thickness over widths equal to
saws’at the meeting lines of consecutive forms, 30 the" widths ofthe side' walls; thereby jleaving in
thereby leaving in each individual form an in
tact the large‘central part `Il’ that is ‘just as wide
dividual panel with perfect, square end edge
asV the internal width of the form. The part vIb
faces. These forms may then be Vplaced in
may therefore'be `regarded as` a downward-pro
stacks, with each form serving'as a caul to com
jection on' the‘bottom‘wall adapted toenter a
press the panel in the next lower forin until it
i like `.form whenl'the two forms are set One-on the
has a predetermined thickness which is main
other; and the‘marginal portions la may bere
tained until the ñnal setting and hardening of
garded` as >shoulders‘on the ¿upper of two forms,
the binder.V
adaptedvto rest on top ofi the side walls of the
The various features of novelty whereby the
under form.
.
present invention is characterized will herein 40
The. height' of the ‘sidewalls is equal to the
after be pointed out with particularity in‘ the
thickness of the panel'to be'molded, plus the
claims-but, for a full understanding of the‘in
thicknessof the> downward projection Ib. There-J
vention and of its objects and’advantages‘, refer
fore,.when‘a form’is nested in another, the effec
ence may-be had to the following detailedlde
tive mold cavity in the lower form has exactly
tions.
scription` taken in connection with the >accom
panying drawing, wherein:
.Figure 1 is an end View of one-of my improved
forms or molds-with the center broken out; Fig.
2 is a top plan view of such form, broken out at
both- the longitudinal and transverse centers;
Fig. .3' is `an end view of two forms that have been
filled and are positioned one upon the‘other to
start' the building of a stack, only a fragment of
each form being shown; Fig. 4 is a top plan view
showing. on a much smaller scale, a plurality of
M
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. the same' cross-sectional shape and area as doesU
the’ product- to bemade;^V andthe bottom of the
upper form' constitutes acaul to‘bearçdo'wn on
and effect the" desiredco‘mpression 'of `a rudi
mentary panel inthe lower form.The molds- are‘inte‘nded to vbe `placed end tov
end in a machine that moves‘th‘e composite form
lengthwisey while a, continuous mat of cement
coated -ñbersis built- up therein; 1 Then,` 4as each
individual:formureaches' a predetermined posi
tion, the mat is severed transversely between*
2,591,414
4
3
I claim:
that form and the next one. The freed form
may then be removed and an Vempty form be
added at the trailing end` of the line of forms.
1. An open ended form for use in manufac
turing cement-fiber board, consisting of a bot
tom wall having square ends and two parallel
Each form so removed carries a rudimentary
side walls that are somewhat higher than the
thickness of the board to be produced, the side
panel with it. Then, when the removed forms
are stacked upon each other, the iinal shaping
of the panels completes itself. The panels are
taken out of the forms only when they have be
walls being slightly shorter than the bottom
wall, the bottom Ywall having on> _the yunder side a
downwardly protruding portion as wide as the
come firm and hard.
VBecause cements, such as Portland cement 10 distance between the side walls; and the thick
ness of said protruding portion being equal to
and gypsum, set due to the formation of crystals
the difference between the height of the side
from an aqueous solution thereof, there has been
walls and the thickness of said board.
a generally accepted belief that cement "fiber
2. A form as set forth in claim 1, wherein each
board, using such cements, cannot be made com
mercially as continuous mats which are then cut 15 side wall is symmetrically disposed with respect
to the bottom wall, whereby, whenever two forms
into panel lengths; for the reason that substan
are set end to end and filled with cement-fiber
` tial setting of the cement, beforesetting, was
mixture, there is in each composite side wall a
deemed essential. I have found, however, that
slot directly opposite the slot in the other com
by using my long, slotted form and a rapidly
moving saw, panel-length sections may be cut 20 posite wall, thereby permitting a saw to be moved
crosswise of the forms through the slots to sever
a board that Vextends through both forms.
3. An open-ended form for use in manufac
At the time a panel is severed from the mat it
turing cement „fiber board, consisting of a bot
should be substantially thicker than the fin
ished product. In Fig. 3 the rudimentary’panel 25 tom wall having square ends and two side walls
each of which is slightly shorter than the bottom
A in the upper form is shown as'being> thick
off squarely and cleanly as soon as they have been
molded into shape.
wall whereby, when two such forms are placed
enough to protrude a little through the top of
end to end, a, slot is created between each side
the form. The panel A1 in the lower form,- on
wall in one form and the near end of thecor
the other hand, has been compressed to give >it
the thickness which the finished product is in 30 responding side wall in the other form ata time
when the two bottom walls are touching each
tended to have. WhenV a third form is added to
other to form a continuous wall, wherein the
the stack, panel A will be compressed thereby -to
under side of the bottom wall is shaped to fit
the same thickness as panel A1. Since only the
over the top and down both the inner and outer
end edges of the panels l_are left exposed when
molds containing panels are stacked, cement 35 sides of the side walls of a like mold when two
such molds are placed one on top of the other.
mortar may be trowelled into such edges, pref
erably immediately after stacking; thereby pre
4. An open-ended form for use in manufac
` turing cement fiber board, consisting of albottom
venting undue loss of moisture while setting and
wall and two side walls each of which is slightly
leaving the edge facesv less fibrous than before.
The form is preferably made of wood and, to 40 shorter than the bottom wall whereby, when two
such forms are placed end to end, a slot is
created between each side wall in one form and
the corresponding wall in the other form at the
concrete form work. On the other hand, the' in
time the two bottom walls are contacting each
terior of the form, especially the bottom wall,
may have its inner surfaces composed of a hard 45 other, wherein the bottom wall containsV in the
facilitate 4the removal of panels therefrom, the
inner surfaces may be oiled as in conventional
top, beyond the ends of the `side walls, trans
plastic, such as a phenol-formaldehyde overlay,
that does not adhere >to the cement. In Fig. 6
verse rabbets for creating downward extensions
of the slots between the opposed ends-of the two
there is such a lining or overlay 6 on all'interior
`
' If desired, the form may be so constructed that
meeting forms.
surfaces of the form.
the bottomk wall constitutes a tie between the two
sidev walls of the next lower form in a stack.
Thus, as shown in Fig. 7, the top of each side
wall is cut away along the outer edge over a
substantial width, as at 1a, thereby leaving an 55
upstanding rib 1b along the inner edge. Each
part 8a of the bottom wall, corresponding to part
The following references are of record in the
ñle of this patent;
Number
296,825
downwardly projecting rib 8°, that is just as wide
and as deep as the excision in the top of the 60
overlying side wall.- When forms are stacked
the parts 8a rest on ribs 1b of the next lower form,
while ribs 8° rest on the depressed vsurfaces ‘Ia
613,085
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It will therefore-be seen that I have created a 6
novel form or 'mold >that‘makes possible the pro
duction of cement-liber board panels in a unique
.
Name
`
.
Smith __ _________ __ Oct. 25,Y 1898
841,749
Wells et al. __ _____ __ Jan. 22,1907
855,084
Zurbuch ___ ______ __ May 28, 1907
855,633
Herring __'____'____’__ June 4, -1907
928,078
Spear _______ ______`_ July 13, 1909
1,019,250
Herzberg et al _____ __ Mar. 5, 1912
1,111,567
Murguiondo ____`___ Sept. 22,1914
Number
along with the further fact that each panel may
remainA in an individual mold until it is» a fm
75
Date
Du Pu§7 __________ __ Apr. 15, y1884:
Ruppel _____ _____ __ Nov'. 24, 1925
FOREIGN PATENTS
due to the fact that the panels are not molded
individually but as part of a continuous mat,
'
Hayward _-__;_____"Sept. 27, 1904
1,562,519
throughout the length of the panel; this being
_
771,011
and eiiîcient way, and insures that the texture at
the ends of each panel is the same as elsewhere
ished product.
,
UNITED STATES PATENTS
Ia in the first species, has along its outer edge a
of the latter form.
Y
ARMIN ELMENDQRF.
REFERENCES CITED
Country
'
t
Y
' Date
__
‘
7,670
France __________ __ Nov. 18, »1845-
1,371
V29,9041
Great Britain _ ___________ __ 1884
Germany ________ __ Dec. 23, 1884