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Патент USA US2411743

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Nov. 26, 1946.`
Filed sept. 2o, 1944
2 sheets-sheet 2
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Patented Nov. 26, 1946
Application September 20, 1944, Serial No. 554,921
2 Claims. (Cl. 144-281)
The invention relates to apparatus for molding
articles and more particularly to new and useful
means for molding plastic-bonded plywood or
other plastic-bonded sheet material by fluid pres
’ contact with the material to be molded, it being
most desirable to avoid air pockets and lack of
contact throughout the surface. vThis operation
has heretofore involved considerable difficulty in
fitting the bag to the mold and material. The bag
has necessarily required a large mouth or open
Objects and advantagesof the invention will be
ing to enable it to be drawn over the mold and
set forth in part hereinafter and in part will be
material, especially where the articles to be
obvious herefrorn, or may be learned by practice
molded constitute large objects such as the wing
with the invention, the same being realized and
or fuselage of an airplane. The matter of en
attained by means of the instrumentalities and
casing or sheathing the mold and article in the
combinations pointed out in the appended claims.
bag has been a difficult and awkward operation
The invention consists in the novel parts, con
and the necessarily loose fit obtained by the use of structions, arrangements, combinations' and im
a bag having an opening large enough to encase
provements herein shown and described.
such objects has led to looseness in the ultimate
The accompanying drawings, referred tc herein
flt and the use of an undesirably large amount of
and constituting a part hereof, illustrate one em- I
extra material. In order to put the bag about
bodiment of the invention, and together with the
the mold and article it has been necessary to drag,
description, serve to explain the principles of the
pull and stretch the bag along, under and over
20 the same. Also it is difficult to wrap the bag or
Of the drawings:
parts thereof about the mold and articles to in
Fig. l is a transverse section of _a mold equipped
sure complete coverage,
with devices embodying the invention;
Moreover, great difficulty has been encountered
in effecting a complete closure and seal ofthe bag»
Fig. 3 is a similar view of another modiflcation;
about the mold and article in order to proceedl
Fig, 4 is a fragmentary plan view of the mold 25 with the molding operation. The molding opera
shown in Fig. l;
tion entails application of fluid pressure and heat
Figs. 5, 6 and 7 are enlarged cross-sectional de_
to the exterior of the bag while Vpermitting the in
tails of a vform of fastening device used with the
terior thereof to exhaust to atmosphere or a lower
Fig. 2 is a similar view of a modified form;
invention; and
Fig. 8 is an enlarged fragmentary plan ,view
showing the fastener in place.
The invention is directed to providing new and
improved means for closing the flexible casings
pressure zone, all as more fully disclosed in said
Vidal et al. patent, for example. _ Where the bag
is not tightly closed, heat and moisture penetrate
such closures and frequently impair or loosen the
mold or the article being. molded or bonded. Sim
or bags utilized in the molding of plastic-bonded
ilarly, where a close and accurate fit between the
plywood, veneer or other fabric or plicated mate 35 bag and the enclosed article is not obtained, the
rial when same is molded into various shapes and
heat and pressure sometimes cause the poorly
articles by means of fluid pressure applied throughA
fitted portion of the bag to stretch across de
a flexible membrane which lies between the source
pressed surfaces in the enclosed article and thus
of fluid pressure and the article being molded.
weaken or break the bag at such point, causing
The invention is applicable, for example, to the 40 .destruction of the bag and of the articles there
method of molding disclosed in the patent to E. L.
Vidal et al., No. 2,276,004, dated March 10, 1942,
Objects of the invention are to provide devices
but it will be understood that the invention is not
for improving the fit of bags or membranes in~
limited to the particular process and apparatus
such molding operations; and to provide com-l
disclosed in said patent, but may be applied gen 45 pletely fluid-tight closuresr4 thereof which can
erally to molding operations and apparatus of the ¿ be quickly and eiliciently“ closed and opened
type broadly referred to above.
throughoutl the entire length‘or breadth of the
In such molding operations it is common to lay
These features of the invention permit
‘ mold.
or place the veneers or other plies of material, in
insertiôn and withdrawal of the articles
ter-larded with thermo-plastic or thermo-setting 50 rapid
being molded; avoid the necessity for overlapping
resin, against the surface of the male or female
and wrapping bags or layers thereof about such
mold and then encase the mold and material to be
articles and molds; permit the shaping of the
molded within a flexible membrane such as a
bag to the mold and Aarticle so that a c_lose and
rubber bag. The bag ~is then preferably exhausted
accurate fit is obtained automatically upon clo
so as to bring the membrane thereof into intimate 55
"animee ï
sure. The invention also leads to great economy
in the amount of rubber or other fabric yused for
the bag membrane and also avoids breakage or
rial, which sheet is permanently and hermetically
and application of heat and pressure and other
bonded by plastic or other means to the plane
surfaces || I. Thus it will be apparent that the
closure members 3 and 4 may be drawn together
by suitable slide fastening means so that the
entire blanket I|0 will be closed and sealed over
rupture of such membranes through handling
The invention broadly comprises the applica
tion to such molding bags or membranes of a
ñexible slide fastener or closure such as that
shown and described, for example, in my Patent
No. 2,355,816, dated August 15, 1944. Such clo
sure, being made of rubber or other fiexible ma
teriai, can be formed integrally with the edges
` of the bag or membrane it is desired to close and,
and about the molds |00 and |03 and the envelop
ing article or material |00 to be molded.
The embodied means for effecting the slide
fastening closure comprises the two major fiexible
rubber bodies or strips 3 and d adapted to be
operably engaged in interlocking longitudinal
relationship. Each of- said strips il and d extends
throughout the length of the opening to be closed,
because of its flexible nature, the closure will 15 is made of relatively thick but pliable and yield
conform lexactly to the shape to be taken by the
bag or membrane against the mold and article
within it. Because of the fact that such closure
can be of indefinite length, the opening of the
bag can be made throughout its length or breadth
or both, thereby permitting same to be laid fully
open for the easy insertion of the material to
i be molded within the mold (female) or readily
able rubber, preferably of about theconsistency
- of automobile tire rubber or slightly softer. Each
of said strips is therefore inherently iiexible
throughout its length and- thus is adapted to
conform to the-‘shape of the container or of the
contents thereof. The strip 3 (Fig. 5) is formed
as a solid rubber body having a flat base portion
5 which tapers to a relatively thin side edge por
brought around the exterior of a male mold, as '_ tion or strip 0. The flat base 5 is adapted to be
the case may be.
25 seated on and vulcanized to the outer surface of
It will be understood that the foregoing general
the membrane or blanket ||0, while preferably
description and the following- detailed description
an overlapping sealing strip l is contiguously
as well are exemplary and explanatory but are
sealed to the outer surface of membrane IIO and
not restrictive of the invention.
overlies the thinner portion 6 and is vulcanized
Referring now to the present preferred em 30 thereto so as to form a strong and fluid-proof and
bodiment illustrated by way of example in the
accompanying drawings, there is shown diagram
flexible connection between the strip body 3 and
the membrane I |0. Similarly body strip member
matically in Fig. l a form of mold |00 for shaping l
4 is permanently sealed and fastened to the mem
or molding part of the surface of an airfoil or
brane ||4 by `similar parts as will -be clear from
aircraft wing, for example. This mold may be 35 the drawings.
similar in principle to those shown in Vidal Pat
ent No. 2,276,004, British Patent 443,696v t0
Groves, and the like, and it is understood that
intermeshed and separably interlocked through
the generally rectangular base or> block |00_ hav
ing the concave portion |02 forming the lower
throughout the length of the member. The socket
The strip members 3 and 4 are adapted to be
out their length andtheir adjacent surfaces are
the detailed construction of said mold and the
suitably formed for this purpose. As will appear
part to be molded thereon constitute no part of 40 from Figs. 5 and 6,. the strip member 3 is the pri- ‘
the present invention -and are here shown as
mary female member of the closure pair,- its in
suggestive and illustrative only of the principle
"ner or meshing surface being formed with a
of the present invention. Said mold còmprises
groove or socket-like recessv I0 which extends
surface and tail and nose curves of the Wing.
A male mold block |03 may be seated within said
outer mold |02 and upon said male mold there
will be laid strips of veneer |04 which are suitably
or groove I0 is formed by an upper node or ridge
Il, the terminal edge of which is arcuate.
lower node or ridge underlies the socket |0 and
curves outwardly and upwardly from the interior
thereof to provide an upper terminal edge I3.
coated or impregnated with thermo-responsive 50 Said edge I3 and the opposite and adjacent ter
plastic material which acts under he'at and pres
minal edge I4 of the node || are spaced closer to
sure to bond and integrate and mold together
each other than the maximum cross-sectional di
- the various layers of veneer or other fabric ma
ameter of the socket I0 so that said socket has a
terial being so molded.
mouth or entrance smaller in cross-section than
In accordance with the invention, the molds
its interior section. The upper surface of the
|00 and |03 and the article |04 to be molded are
node I I is reversely curved at I5 to form 'a rounded
all encased within a fluid-tight membrane or
top for the member 3 which continues in a sub
' casing which, as shown, comprises the overlyingstantially uniform arc around the surface there
rubber blanket H0, the edges of which lie upon
ofrto form a re-entrant groove I6 along the back
the plane border surfaces ||I of the mold block 60 edge of the member 3 and at about the same level
|00. The peripheral edge of said blanket ||0 is
as the lower portion of the rsocket I0. 'I'he ta
provided with` a beaded closure member 3 formed ~ pered upper surface of the base member 5 extends
of rubber or other ñexible material, which mem
into the groove i6 as shown. The lower surface
ber is preferably' shaped ~ and constructed as
|'| of the lower node I2 curves downwardly and
shown and described in detail in my Patent No.
rearwardly to terminate at a slight shoulder I8
2,355,816. Said member preferably extends along
formed in the fiat base of the portion 5.
the entire periphery of the blanket ||0 and when
The strip I constitutes the primary male mem- '
said blanket is laid in the mold-covering >position
ber of the closure couple and its engaging or front
shown in Fig. 1, said closure member 3 is adapted
face is provided throughout its length with pro
to be engaged with the mating closure member 4
truding node 20 which is substantially circular in
which is fastened to the plane border surface | | |
cross-section throughout about three-fourths of
of the/block |00. As shown, said mating closure
its cross-sectional circumference and is shaped
member d is fastened to said border surface I||
and positioned so as to flt very tightly into the
of the block, being formed as an integral border
socket-portion I0 of the member 3. The rear or
ing part >of a sheet llt ofrubber or other mate
neck portion 2|` of the node 20 is narrower than
2,41 1,748
the maior-diameter of the .node and thus is `
adapted to conform to and nt tightly in the space
between the edges I3 and I4 of the member 3.
The face of member 4 above the node 20 is re
construction therefore greatly facilitates the /slld
i118 engagement and disengagement of the strip
members, while at the same time the sealing
actions of the flexible lip members 23 and 21
provides a unique sealing function in combina
tion with the main interlock as above described.
entrantly grooved to form an> arcuate socket 22
which is adapted to receive and intimately en
The invention provides means for joining and
gage the node portion Il of the member 3. The , closing togetherthe strips 3 and 4 of the closure
' portion of the member
of slide action and one important feature of the
tapered to form an overlapping and relatively
is the construction of slide means which
thin lip portion 23 which overlies the upper
will reduce to a minimum the friction and re
grooved surface I5 of the member 3 to a sub
sistance to such closures under all conditions- of
1 stantial extent. It will be noted that the termi
nal edge of the lip member 23 is in substantially
the same vertical plane as the terminal edge of
use of the device, while at thesame time pro
viding the maximum of tightness and compres
the node member 20. ’I'he upper surface' of the
llip portion 23 is rearwardly and downwardly
~so as `to provide and maintain an exceedingly
curved in an arc 2_4 roughly corresponding-in ‘
sion of the engaging parts of the closure strips
tight, and therefore effective, sealing closure.
For this purpose a rolling and compressing action
shape to that of the surface I5 of member 3 and
is preferably employed. As embodied the slide
being re-entrantly grooved at 25 along the rear
comprises a frame having a flat, generally rec
edge of the member 4, which groove merges with
tangular metal base piece 30 which overlies and
the rising surface of the tapered base 5 so as to - is spaced a short distance from the top of the
form a groove identical in shape with and atl
the same level as the groove i3 of the member 3
but .facing in the opposite direction, as will be
clear from the drawings.
The lower portion of the node 20 merges with
a reversely curved grooved portionl 23, the cross
sectional outline of which corresponds intimately
`with the node I2 of the member 3.- Below ‘the
groove 23 the member 4 curves` inwardly and
downwardly to form the relatively thin and flex
ible lip portion 21, the base of which is cc-exten
sive with the fiat base of portion 5. The inner
' outermost portion ofthe lip 23 of the strip mem
ber 4, said plate 30 thus lying parallel to the
base 5 and the face of the membranes I and 2.
Each of the four corners of the plate 33 is aper
tureq to receive a vertically-disposed pin 3I hav
ing an enlarged head 32 the base of which lies
flush against the top of the plate. Said pin ex
tends downwardly from the plate a sufficient dis
tanceto serve as an axle or -journal- for a roller
33 which is rotatable thereon. Said roller has
.an upper cylindrical portion, the top of which .
underlies the bottom surface of the plate 33 and
therebelow the surface of’the roller is curved as
shown in Fig.v 6, said curvature being such. that
f abut against the'shoulder I3 of member 3 when
the roller is circular in cross-section throughout
the strips are in their interlocked engagement,v
but of diminishing radius nearly to its bottom
as wm be clear from Figs.> 6 and '1.
portion where it again flares to terminate in a
When the strips 3 and 4 are inter-engaged as '
circular hub 35. Said hub has a roundedl edge
described and shown, the central node portion 40 ofl a thickness such that it fits intimately into
20 is tightly interlocked within the receiving
the groove 25 of the strip member 4 (or groove
socket 'I0 of the member 3. That is, it is neces
I'S of strip member 3 as the case may be) while
sary to force’ the member 20 into the vsocket I0
the rear curved portions 24 and I5 of the strip
between the constricting jaws I3 and I4 of the ~
members 4 and 3 respectively fit generally into
latter, the resiliency ofthe rubber permitting this 45 the
curved surfaces 34 of the rollers. It will be
action. At thev same time the lower node I2 and
that each of the rollers 33 at the
the upper node il of the member 3 are recessed
four corners of the plate 30 is identical in con
in the sockets 26 and 22 respectively of the mem
struction and that each of them is rotatable
ber 4 so that a firm union and interlocking closure
on its respective axle pin 3i as shown. VThe lower
isaiforded by these parts. In addition, however,
ends of said axle pins 3l are enlarged at 35 to be
the overlapping relatively thin and pliable lip 23
seated in conforming recesses at the base 35 of
embraces and overlies the entire joinder of thethe rollers and thereby act to rotatably support
strips. This lip member therefore forms an effec
said rollers as shown.
'tive seal to the entire closure or joint and. be
As will be clear from the drawings, movement ~
cause of its thin-ness and relative pliability, it is 55
of the slide 3_0 lengthwise of the strips 3 and 4
adapted to be forced tightly against the upper
cause the rollers to rotate due to the fric
surface I5 of member 3 when the closure is sub
tional engagement thereof with the outer or rear jeoted to external fluid force during the molding
edges I5 and 24 of the strips 3 and 4 respectively.
operation. That is, the fluid pressure exerted
rollers thus exert a cammingfan‘d squeezing
against fthe surfaces of the container or blanket
actionl upony the strips to force them toward
tends to compress and thereby tighten the closure
each other and into interlocking engagement as
of the entire joint and especially to' force the
overlying lip 23 tightly over and against the ' shown. The bottom hubs 35 of therollers travel
surface I5 and thereby effectively seal the entire - in the grooves I6 and 25 and thereby exert power
joint. _In a similar manner the underlying, rela 65 ful clamping and compressing action upon the
edge of lip 21 extends so as to underlie the curved
surface I1 of the portion I2 of member 2 and
tively thin tapered lip 21 performs alike function
for the lower portion of the closure as will be ob
vious from the foregoing taken in connection with
strips so as to- cause the interlocking nodes 20
and I2 and their respective socket portions to
be forced4 quickly and ñrmiy together. Due to
`the seating of the hubs 35 in said grooves, the
It will be noted‘that the engagement of node 70 slide is at all times intimately engaged with the ‘
strips 3 and 4 wherever it may be located along
II in the socket 22 and node i2 in socket 25
them and‘merely by pulling it lengthwise along
are relatively easily separated by transverse move
said strips it forces the unengaged strips to
mentl as there» is little or no interlocking action
gether as stated and shown. It will be recog
at these surfaces, the only true interlock being
between the socket I0 and the node 20. This 75 nized that by the'utilization of rolling friction, a`
relatively great compressive force can be >exerted upon the strips while at the same time assuring
easy operation of the slide along the strips under
- any and all conditions.
Moreover the provision ,
chains 60 and 6| are provided for this purpose.
Said chains preferably comprise links separated
by small beads 62.,Ä Each arm of the spacer mem
bei' 50 is apertured by a slot 53 ~the outer portion
of four such rollers, as shown. tendsV tomain 5 of which is narrow and which is enlarged termi
tain the movement of the slide rectilinear and
nally to permit passage of the link portion 60 of
even as it travels along the strips. thereby pre
the chain but is too small to admit passage of the
venting an‘ypossibilitypf jamming or tilting or ' bead members 62 thereof. Thus any pull on the
twisting vof the slide out of its desired trackway,
chains in either ldirection will. cause the follower while the -multiple rollers distribute the rolling 10 members 50 to slide along the strips. The chains
friction and thereby reduce the force required.
at one end are fixed to the slide plate 30, the lower
It will furtherbe understood that movement
ends 65 thereof being downwardly flanged at 66
v,of the slide in one direction will effect closure
to provide means for attachment of ythe endsv
and inter-engagement of the strips 3 and 4.
of said chains. The flanged portions 66 areap
~However, a reverse movement of the slide will 15 ertured at 61 in form similar to the apertures 53,
not automatically separate the strips,_ but will
there to receive the end link and bead of the
merely make their separation possible by hand. - chain as shown. Thus when the slide is pulled
Thus the closure of a bag. for instance, will re-`
upwardly, it pulls the chains 60 and 6| along with
main water-tight until it is actually opened.
it and in so doing causes the followers 50 to be
Means for facilitating sliding of the slide on the 20 -pulled along the strips to take up their spaced
vstrips is provided and same is constructed so as
positions along the taut chains. Preferably, the
to further reduce> any possibility of the slide tov
followers are provided in sets of pairs spaced by
tilt or assume an undesired angular position on
a single bead 62 thus providing a distribution of
the strips in either direction of movement there
gripping action at each pair of said followers.
along. As embodied a slide pull comprising a pair 25
The bottom ends of the strips 3 and 4 are pref- '
of looped cords 40 and 4| is provided, the ends of
-erably maintainedl permanently interlocked to
said cords being passed through a button or aper
gether and for this purpose an arcuate or U
tured handle member 42 and knotted at 43. The
shaped band 10 is tightly gripped about the ele
opposite ends of said cords are passed through
vated portions of the strips as shown in Fig. 8.
longitudinal slides 45 and 46 respectively formed 30 The terminal ends are tightly embedded into the
in the slide plate 30. Thus when it is desired
grooves |6 and 25 respectively of the two strips so
to pull -the slide upwardly to close the strips to
that said band 10 is tightly fixed and stationary
gether, the cord loops will slide to the upper ends
near the lower ends of said strips. The bottom
of the slots 45 and 46 and the pull will be exerted
ends of the chains 60 and 6| are fixed to said band
there substantially parallel to the plane of the
10 by ears ‘I5 which extend toward the sides of
slide 30 and the direction of desired movement.
said band and are provided with appropriate
- Conversely when it is desired to pull the slide
openings 16 to receive and hold the ends of said
downwardly in the opposite direction, the looped
chains as shown.
cords will slip to the bottom of the slots 45 and ~
Thus in the embodiment described above, it
46 and thus the pull will be exerted at the lower
will be seen that complete and rapid closure of
end of the slide and therefore more closely par
the molds and article to be molded may be ef
allel to the desired plane of movement. In other
fected simply by laying the properly shaped
' words, no tilting action is imparted to the. slide
blanket ||0 thereover and sealing same to the
or carriage in either direction of movement
mold block |00 by means of the slide fastener
4 thereof as would be the case if the point of ap
.plication of the pulling force were ñxed at the
center or at either end of the slide. Hence bind
ing or wedging of the slide on the strips is mate
rially reduced by this feature of the invention.
The invention provides additional means for
maintaining compact closure and security there
Aof throughout the length of the strips 3 and 4 over
which the slide 30 has been moved in the closing
direction., For this purpose a plurality of slide
following members 50 are provided, said members
being adapted to be drawn after the slide 30 and
to maintain the compactness of closure which has
been effected thereby. Said following members
50 are preferably substantially U-_shaped pieces of
operation 4described above. .Consequently the
blanket. ||0 may be accordingly shaped to oo_n
form to the mold and article without any slack
or wrinkles and without'requiring any close set
ting or manipulation during or after the appli
cation thereof. At the same time the closure ef
fected by the above-described means is fluid-tight
even under the pressures and temperatures yused
for the molding operation so that no danger of
leakage or rupture is involved.
Referring to the modification of the invention
shown in Fig. 2, the mold block |00, the molds
|02 and |03 and the article |04 to be molded are
substantially the same as those shown in Fig. 1.
However, with this form of the invention the
flat metal, the interior curvature of which con 60 closure members 3 and 4 are located along an
forms substantially to the exterior outline of the
intermediate line of the overlying blanket which
curved portions I5 and 24 of the strips 3 and 4
comprises two separate pieces |20 and |2|. The
when the latter are inter-engaged. Inwardly dis
edges of the piece |20 are sealed to the upper
posed tongues 5| and 52 are provided near the
border surface | || of the mold block as by an
'ends of the arms of the member 50 and extend 65 overlying metal or other hermetic sealing mem
ing into and travelling along the grooves I6 and '
ber |25, while the similar edges of the piece |2|
25 respectively, there acting to maintain the pres
are similarly> sealed by means |26. The closure
sure and compacting force originally exerted by
members 3 and 4 may and preferably do extend
the hubs 35 of the rollers 33 of the slide.
Means are provided for drawing the followers
50 after the slide and for maintaining same in
suitable spaced positions along the closed parts
of the strips 3 and 4. As embodied each of the
followers A50 is attached to ñexible cords or chains
along either side of the strips ,and as shown
throughout the length of the mold and blanket '
members |20 and |2| so that same may be laid
back to either side of the mold for the insertion »
of the mold |03 and its attached article |04.
When same have been inserted, the fiaps or pieces
|20' and |2| are laid over the top thereof and
the closures 3 and 4 are drawn together by means
9 A
The invention in its broader aspects is not lim
ited to the specinc mechanisms 'shown and de
will-be understood that the-iiexibility oi.' the fas
scribed but departures may be made therefrom
tener or closure means 3 or 4 permits a. continuity
within the scope or the accompanying claims
of the flexible and pliable nature of the members
|20 and l2l throughout their length so that same fà without departing from the principles oi' thé in
vention and without sacrificing its chief advan
- will conform even along the edges of the closure
to the surfaces to‘ be molded therewithin.Í Thus
What I claim is:
a completely tight and accurate iltting> oLthe
1. In ñuid pressure molding apparatus in com
membranes is assured throughout the length of
of the slide fastener as previously described. It "
the bag or membrane means, while a completely 10 binatlon,l a mold curved in at least two directions
and adapted to have material to be molded in
fluid-tight closure is effected in a position most
Contact therewith,\ a ilexible `huid-impervious
’envenient for insertion and removalof the mold
membrane positioned to cover said mold and ma
or articles to be molded. The work need not be
terial, the membrane being shaped and sized to'
dragged along in contact with the blanket or
conform closely to said mold and material, means
membrane during the closing and ñtting opera
for subjecting the face of the membrane remote
tions nor will the blanket or membrane be
from the mold and material to fluid pressure and
dragged or brought in contact with the fioor or
means for venting the opposite face thereof to
other surfaces while putting the assembly in the
a lower pressure, and an opening in said mem- .
autoclave for heating and application of pressure.
The minimum surface and quantity of material 20 brane, the edges of said opening being formed as
ilexible mating strips of yieldable material, and
for the ñuid-tight membrane’is providedby this
a slide member for joining said strips in a fluid
_and the first form of _the invention described
tight closure, said closure being substantially co
while a minimum of handling thereof isl entailed
extensive with one of the major axial dimensions
in both cases.
. Referring to the form of the invention shown 25 of the mold.
2. In iiuid pressure molding apparatus in com
in Fig. 3, same is there show-n as applied to a bag
like membrane which is wrapped around or com
pletely envelopes the mold and article to be mold-4
bination, a curved mold adapted to have mate
rial to be molded in contact therewith, a flexible
fluid-impervious bag for enclosing said mold and
ed, as in Fig. 2 of said Vidal patent. for example.
In this form the male mold i3lllis positioned'with 30 material, said bag being shaped and sized to con
form closely to the mold and material there
vthe materials I3! to be molded thereabout and
within, means for subjecting the face o1’ the bag
this assembly is surrounded by a bag or mem
remote from the mold and material to fluid pres
brane comprising a continuous blanket |35 which,
sure, means for venting the opposite face thereof
as shown, completely envelopes ,the mold and
article. The closure of said bag or envelope is 35 to a lower pressure, and an opening in said bag
substantially coextensive with» one of the major
eñected’by the closure members 3 and 4 provided
axialjdimensions of the mold, the edges of said
throughout the length of the opening or mouth of
opening being formed as flexible mating strips.,of
said bag, said opening and closure members pref
yieldable material joinable together in a fluid
erably _extending throughout the length of said
tight closure, said closure ~being continuous
bag. Here again the minimum amount of blanket
throughout the length of said opening and flexi
or membrane material is required to completely
bly movable with the walls of the bag in respect
envelope the mold and article and same may be
to the mold.
drawn tightly into conformity therewith by the
act of closing the bag as already described.
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