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Патент USA US2409394

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(kt 15, 194-6-
1.. L. S>CHAFFER
2,409,393
‘
FLUID PRESS.
Filed July 29, 1943
2 Sheets-Sheet l
lNVENTDF-i.
1. ES LIE LASZLU E31: HAP-FER.
ATTDRN H‘ E.
-
Oct. 15, 1946.
‘
1.. L. SCHAFFER
"
' 2,409,393
FLUID muss
Filed July 29, ‘1943
' 2 Sheets-Sheét 2
‘
.
. Inventor:
/. ESL/E LASZLO ‘SCHAFFER
16
21
x
N
2,409,393
Patented Oct. 15, ‘1946
UNITED ‘STATES’ PATENT oFnca
‘FLUID rnnss’
I Leslie Laszlo‘Schaffer, Vancouver, British
Columbia, Canada
‘
‘ _Application July 29, 1943, Serial No. 496,635,
3 Claims. (Cl. 144-281)
V
2
closed at their ends. A partition or base 13, also
carried by the hinges I2, is located between the
casings I0 and II. Suitable means may be pro
vided for limiting the outward movement of the
casings, such as, for example, brackets 5 having
elongated slots 6 therein. Each bracket is piv-_
otally connected to the base l3 at l, ‘and. a
threaded pin 8 extends outwardly from the ad
'- Thisinvention relates to improvements in ?uid
presses.
‘
'
‘
j
' An ‘object of the present invention is the pro
vision of a1 ?uid press for forming and shaping
laminated
articles.
‘
'
'
'
Another object is the provision of a ?uid press
particularly for forming and gluing plywood ar
ticles, such as clips; ‘angles; fasteners; cabinet,
furniture and panel moldings, shaped parts; and
the like.
‘
1
jacent casing through the slot of the bracket
10 where it is held in place by a nut 9. If desired,
‘Another object is‘the provision of a press for
producing these articles without internal stresses,
bridging, misalinement, twisting or warping, or
in other words, articles which will always retain
their ‘proper shape.
‘
-
' the casing Ill may be mounted on brackets Ill
which retain said casing at an angle to the’hori
zontal. The casing ll may be closed over the
casing 10 with the partition or base l3 therebe
15 tween and they may be ?rmly held together by
- A further object islthe provision of a press for
any suitable locking ‘mechanism, such as by.
molding ‘thin laminations without splitting or
wrinkling them during the operation.
means of clamps I5 hingedly mounted on one
casing and ?tting over blocks l6 carried by the
other casing. As_ the apparatus between each
20 side of the partition or base [3 and the adjacent
which does not requireskilled operators.
casing is' the same, only one will be described in
Another object is the provision of apparatus
detail.
for veneering preshaped parts or articles,‘ ‘
A mold ll of the shape of the ?nished article
Yet another object is the provision of a press
is mounted on the surface of the partition or
of the nature described of, very'simple and in
25 base l3 facing the casing. This mold is of any
expensive construction.
1‘ '
i
>
"
practical shape, in this case it is V-shaped, and
With these and other objects-in view, the pres
it may project through and beyond one or both
ent inventionv consists essentially of a ?uid press
ends of the casing as shown in Figures 1 and 2.
for»molding laminated ‘articles, comprising a’
The casing and partition form a support for a
mold of the shape of the ?nished articles, means
for resiliently retaining a plurality of superposed 30 layer‘ I'll of a suitable ?exible material, such as
- A still further object is the provision of a press
laminations of bendable material with glue there- ‘
canvas, yieldably mounted thereon. The layer
between around the mold, and means for ?rmly
pressing the. laminations against the surface lof
the mold to impart the shape ofthe latter to the
laminations‘as they are pressed together, as more 35
which is connected to one side of the mold or to‘
in 4the following speci?cation and the accom
springs 20, anchored to the bottom of the casing
the partition adjacent the latter stretches across
to the opposite side of the casing and has slots
[9 for clearing the blocks 16 and‘clamps I5. The
fully described and illustrated by way of example ‘ ' layer extends to suitable yielding means, ‘such as
panying‘drawings, in which
‘a
or at any other suitable point. If desired, rollers
2| ‘may be provided at the outer side of the casing
in order to prevent the layer from having to move
around sharp corners. When the partition is in
‘
Figure 1 is a "front elevation of one form of '
press,
'
l
‘
Figure 2 is a plan view thereof,
' >
Figure‘B is ‘anenlarged cross section through‘
the vertical position shown in Figure 3, there is
the press when open and ready for’ loading,‘ ‘
. Figure 4 is a similar view with‘ the press closed,
a space between the mold and the layer.
'
A ?ller 22 of wood or other suitable material
Figure 5 diagrammaticallyillustrates a press 45 is located in the casing and a cavity‘ 23 of sub
stantially the‘same shape as the mold I1 is cut
for‘ applying one or more veneers‘ to a mold or '
core.
.I
,
therein.‘ The cavity -_is,'however, larger than the
.
, ‘Figures 1 to 4 illustrate a double press, but it
‘mold so that when the latter is placed in‘the
iscto be understood that this arrangement may
former, there is a space therebetween for hold:
50 ing a bag 24 formed ‘of a suitable ?uid-impervious
sistsof‘ two casings Ill and II connected together 7 ‘ ?exible material. The bag in this space will as
also beused in ‘a. single press.
The press con
sume substantially the shape of the cavity and
mold, and shoulders 25 on the ?ller extend over
at. their‘adjacent edges by' V-hinge‘s l2.‘ These
casings‘ are open‘ topped and for convenience,
the upper edges of the bag. The space between
may be‘formed from channel beams or half 'cylin-‘
dersof the desired-length and width“ whichare'
55
these shoulders?is equal approximately to the
3
2,409,293
width of the mold ll at the top thereof. Fluid
under pressure is supplied to the bag through a
pipe 26 which extends through the bottom of the
casing. If desired, a protective layer 21 of can
vas or the like may be placed over the top of the
bag. It is obvious that, in place of the bag 24, a
layer of ?uid-impervious material may be secured
to the inner surfaces of the shoulders 25 forming
a space above the surface of the cavity into which
the ?uid may be directed.
The molds in this press are designed to form
relatively long plywood angles and so the molds
are V-shaped in section and are fairly long.
In operation, the press is opened up, as shown
in Figure 3, that is, the casing II is moved about
the hinges 12 away from the casing H] as far as
the brackets 5 will permit. This causes the par
tition l3 to assume a vertical position and the
layers Hi to stretch out over the entrance to the
cavity 23. A plurality'of laminations 30 of bend
able material, ,say for example, wood, with glue
therebetween, are placed on each layer IS. The
laminations may or may not be encased in or
4
layer I 8, while pressing the laminations ?rmly
at the bending line, permits relative movement
of the laminations laterally away from the said
line so that all the laminations are intimately
5 retained together. This method maintains the
laminations in proper alinement and, consequent
ly prevents the development of internal stresses
which might later alter the shape of the ?nished
article. It also prevents “bridging” which is the
10 result of glue failure along the bending line. The
fact that the pressure is ?rst applied on the
bending line and a ?rm contact is maintained
thereon by layer 18 prevents the laminations from
separating from each other at any point. The
15 movement of the wood away from' the bending
line before the main pressure is applied elim
inates any possibility of this movement being
stopped by the pressure along the relatively large
sides of the V.
It will be noted that there is
20 very little strain on the bag at any point because
it is supported on all sides by the ?ller 22, shoul
ders 25, layer lBand the laminations on the mold.
The bag is emptied before the press is opened
covered by paper or other material. It is only
necessary to move the laminations inwardly to 25 and it is preferable to have a valve in the ?uid
supply line, which is closed (after the bag is de
wards the mold as far as they will go. This auto
?ated so that the latter will not materially rise
matically retains them in their proper positions.
in the cavity when the molded article is removed.
Then the casing II is closed over the casing it
Cold-setting or hot-setting glue may be used.»
with the partition therebetween and the unit
In
the latter case, the mold I1 is heated in any
locked in this position by means of the clamps 30
suitable manner, such as by means of an electric
l5. This loading is a very simple operation and
heating element 3|. A thermometer and a ther
may be done by anyone without any special
mostat may be provided for indicating and regu
training.
'
lating the temperature of the mold. The bag is
The action in each section of the press is the
same. During the ?rst part of the movement, the 35 spaced from the heated mold, by the laminations
side of the mold i1 bears against the laminations,
and the mold presses the laminations into the
to be ‘bent and the ?exible layer 18 and also the
layer 21, if used. consequentlyythe bag is not
liable to deterioration due to overheating because
cavity 23. Actually, the pressure is ?rst applied
it does not come into direct contact with the
to the laminations by the outermost part of the
heated
mold. In the right section of the press
mold, and this part presses them into the cavity. 40
the cavity 23 moves towards the mold [1, while
In other words, the ?rst and greatest pressure
in the left section thereof,v the latter moves
is directed along the main bending line of the
towards the former.
laminations, resulting in intimate contact here
While this press has beenshown with layers
before the ?uid pressure is applied. All this time,
I8, it may be used without them. In this case,
the layer I8 ?rmly presses the laminations against
the mold so that they cannot move out of place, 45 the laminations would have to be placed on the
?ller 22‘ over the cavity 23. In fact, they may be
and yet the yieldable support of the layer per
premolded into approximately their ?nal shape
mits the laminations to move relative to each
other and away from the bending line when they a before gluing. The mold I1 then presses said
laminations into the cavity and they are‘ pressed
are assuming their ?nal shape during this oper
ation. The necessity for this relative movement 50 against the former by the pressure of the bag.
This is not considered as satisfactory as the ?rst
may be illustrated by bending a gro’upof pages
described
method, since there is more likelihood
of a book. It will be noted that if the pages
of the laminations becoming displaced during
are kept against each other there is a relative
movement therebetween resulting in a bevel being 55 this operation and since the relative movement
of the laminations may not be su?icient to elim
formed at each side edge of the pages. With this
inate all the disadvantages of the systems where
V-shaped mold, the layer holds the laminations
in no such movement and no initial pressure on
most ?rmly at the point where they bend around
the bendingline is provided for.
the bottom relatively sharp corner of the V.
This -
The layer I8 is an important element in this
is very desirable and it results in the laminations
being pressed from this bending line towards 60 press. The resistance it offers causes the pres
sure ?rst to be, applied to the bending line as the
their sides. The layer l8 supporting and guiding
mold
moves towards the cavity. In fact, once the
the laminations continuously during the whole
layer has wrapped the laminations about the
loading and closing operation, prevents the dis
mold; the ?nal pressure may ‘be applied to said
placement, splitting, wrinkling and overlapping
laminations
in any suitable manner; although the
of the laminations, which would happen if they
?uid pressure is preferred.
were not so supported and guided continuouslyt
Figure 5 shows the press adapted for veneering
When the press is locked, the bag 24 (or the
wood molding or veneering'cores. In this modi
space beneath the layer covering the surface of
the casings are indicated by the numeral
the cavity) is ?lled with fluid under pressure. 70‘ ?cation
35 and are connected‘ together by a hinge 36
This exerts the same pressure over the entire
which supports a partition or base 31. The base
outer surface of the laminations bent around the
is adapted to receive one or more strips 38 pre
mold. As well known in hydraulics, the pressure
viously referred to as cores, which are tov be cov
is exerted at right angles to the ‘surface at_ all
ered with a- veneer. These cores are adapted to
points. Asthis pressure is‘ applied, the yielding 75 be
secured to the base by any suitable means and
2,409,393
6
mounted between the casings, a mould of the
shape of the ?nished article mounted on each
side of the base, a cavity in each casing adapted
to receive the mold on the base opposite its cas
ing, a layer of ?exible material positioned on op
posite sides of the base, each layer being con
nected at one of its ends to the base of each
mold and extending over the entrance to the cav
bag M, as previously described. The springs 4i]
ity, resilient means connected to the opposite end
tension the layer 39 and as the casings are closed,
of each layer to keep it taut, each of said layers
the layer exerts the initial pressure upon the 10 being adapted to receive between itself and its
veneer, forcing it into intimate contact with its
adjacent mold a plurality of superposed lamina
core 38, ready for the ?nal fluid pressure to be
tions of bendable material with glue therebetween
to be readily removable after the veneer is ap
plied, a layer 39 of flexible material is fastened
along one of its borders to‘ the base 37 and eX
tends over the remote side edge of each casing,
where it is held taut by springs as. The casings
are provided with fillers 4| de?ning cavities 42
and each cavity is preferably ?tted with an air
applied through the medium of the bag 44, in
?ated by steam, compressed air, or liquid.
What I claim as my invention is:
l. A fluid press for molding laminated articles,
and yieldably to press and hold against disalign
15 ment said laminations around the molding sur
faces of the molds as the latter are moved into
comprising two casings hingedly connected at
their adjacent upper corners, a base hingedly
mounted between the casings, a mold of the shape
of the ?nished article mounted on each side of
the base, a cavity in each casing adapted to re
ceive the mold on the base opposite its casing,
a layer of flexible material positioned on oppo
site sides of the base, each layer being connected
at one of its ends to the base of each mold and
extending over the entrance to the cavity, resil
ient means connected to the opposite end of each
layer to keep it taut, each of said layers being
adapted to receive between itself and the adja
cent mold a plurality of superposed laminations
of bendable material with glue therebetween and
yieldably to press and hold against disalignment
said laminations around the molding surfaces of
the cavities when the casings are brought to
gether with the base therebetween, a ?uid-imper
vious flexible bag lying on the surface of each
cavity, means for ?rmly holding the casings to
gether with the molds in the cavities, and means
for supplying fluid under pressure to the bag to
press the articles against the molds.
3; A ?uid press comprising a casing, a base
hingedly mounted on the casing at one side there
of, a mold mounted on the base, a cavity in the
casing adapted to receive the mold, a layer of
?exible material secured at one of its ends to
said base in close proximity to the mold and
stretching across the cavity, resilient means an
chored to a ?xed point and connected to the op
posite side of the layer to keep it taut, said layer
being adapted to receive and hold against dis
alignment bendable material between itself and
the molds as the molds are moved into the cav
the mold and yieldably to press said material
35
ities when the casings are brought together with
around the mold as the base is pivoted to move
the base therebetween, means within each cavity
the mold into the cavity, means within the cavity
capable of moving outwardly therefrom, means
capable of moving outwardly therefrom, means
for ?rmly holding the casings together, and means
for ?rmly holding the mold in position in the
for moving the movable means of the cavities 40 cavity, and means for moving the movable means
outwardly therefrom to press the articles against
within the cavity outwardly to press the material
the molds.
against the mold.
2. A fluid press for molding laminated articles,
comprising two casings hingedly connected at
their adjacent upper corners, a base hingedly
LESLIE LASZLO SCHAFFER.
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