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Патент USA US2114708

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2,114,758
Patented Apr. 19, 1938
UNITED STATES PATENT OFFECE
2,114,708
MEANS FOR MANUFACTURING FOOTWEAR
David Gordon Gash, Balaclava, Victoria,
Australia
Application April 23, 1936, Serial No. 75,997
In Australia April 26, 1935
2 Claims. (C1. liti-_42)
cementing together both the parts to be con
last the closure of the sections under pressure
effects a positive conforming of the unvulcanized
rubber to the shape of the last and selected pres
sure sole and heel plate to bring the moulded
shoe or boot to the condition of being cooked in UX
a vulcanizer or other practical apparatus.
A further important feature embodied in the
invention is that the soles .and heels are com
posed of a rubber having a substantially harder
composition than that of the upper while the sole
joined and the lining of canvas or the like which
may have formed thereon a tread of desired con
This invention has reference to a method of
and means for manufacturing footwear and has
been devised to provide footwear which is mould
ed in lieu of being constructed in various parts
5 to form the completed shape.
It has been the .accepted practice in the manu
facture of footwear particularly when moulding
rubber or like resilient shoes or boots to form the
same in various sections which are united by
necessitated costly and tedious operations while
in the finished product the parts had a tendency
to disunite more particularly the sole from the
15 upper canvas.
The main object of the present invention is
to provide a method of manufacturing footwear
particularly rubber boots and shoes in one com
plete unitary structure and wherein the above
disadvantages and defects are obviated, the ñn
20
ished article being of the necessary resiliency and
having the quality and durability to withstand
normal use without becoming misshapen, which
is a detrimental feature of leather footwear, while
the normal shape of the shoe or boot conforms to
the shape of the foot when removed therefrom.
With the above object in view the» present in*
vention consists in moulding footwear in one
complete structure and wherein the last or core
30 which is of a standard shape is ñrstly coated with
uncured rubber after which the sole and heel
portion is shaped on the last by pressure whereby
the form may be cooked in a vulcanizer with the
resultant moulded product being a boo-t or shoe
35 formed in one complete unit of the desired shape
and size.
An important feature embodied in my inven
tion is that during the application of the un
cured rubber to thel last or core it may be suit
40 ably coloured and shaped to a desired configura
tion, while the sole and heel may be constructed
of rubber having less resiliency or elasticity than
the material employed for the upper.
Another important feature embodied in my
45 invention is the provision of means for moulding
a shoe or boot by the method described and by
the employment of said means moulding the said
footwear in one complete structure of a desired
shape the means preferably comprising a mould
50 constructed in two correspondingly shaped sec
tions between which may seat a last or core of
selected size while a selected pressure plate is
associated with said sections to seat therebe
tween and over the base of the last or core where
55 by .after the rubber or material is coated on said
figuration.
The invention will be hereinafter more par
ticularly described with reference to the accom
panying drawing showing a mould for carrying 15
out the method according to the invention and
in which:
Figure 1 is a plan view of one section of the
mould having the core and sole pressure plate
positioned therein.
Figure 2 is a plan view of the co-acting section
of the mould.
Figure 3 is a sectional elevation of the assem
bled mould sections with the core and sole pres
sure plate in position.
Figure 4 is an elevation of the core or last
of the mould.
I
Figure 5 is a sectional elevation through line
5_5 of Figure 4.
Figure 6 is an elevation of the sole and heel
pressure plate.
Figure ’7 is a sectional elevation through line
'l-‘I of Figure 6.
According to one form of carrying my inven
tion into practical effect with the method pre#
viously described I provide a lnould comprising
two co-acting sections IIJ each section being hol
5
lowed to form `a recess II therein adapted to re
ceive with a predetermined clearance one side or
portion of a correspondingly shaped last or core
I 2 which conforms to a standard shape. Formed
adjacent the base of the recess II in each sec.
tion IIJ is an extended recess I3 adapted to re
ceive a sole and heel pressure plate I4 this latter
recess I3 being slightly deeper than the recess 45
II shaped to receive the last I2 for the purpose
of providing a welt on the moulded shoe or boot.
The back of the pressure plate I4 for form
ing the sole and heel is formed With oppositely
disposed tapered cam surfaces I5 extending out 50
wardly from each edge and converging in the
approximate centre of said plate I4, correspond
ingly tapered cam surfaces I5 being provided on
the adjacent edges of the moulding sections IU.
Such tapered surfaces I5 and I6 are for the pur 55
2
2,114,708
pose of facilitating the entry of the pressure
plate M when the last i2 is in position and is
coated with uncured rubber ll the said pressure
plate Iii being forced in a direction parallel to
the interface between the sections into correct
position when the two sections Ill of the mould
after the product has been vulcanized.
The effective surface or recess II of the mould
section Iii may be provided with projections or
indentations 23 in order to impart to the exterior
of the shoe a desired pattern or configuration
are assembled.
and similarly the last l2 may be provided with in
In order to prevent the last I2 from being
forced out of position when the sections I0 of
dentations 24 on the back of the heel in order
that the interior of the moulded product may
have gripping means formed thereon such as a 10
10 the mould are being assembled I provide one or
more keyways or grooves I8 on the upper or po
plurality of spaced projections.
sitioning portion of the last i2 which keyways
With the last I2 having the coating of uncured
i8 are adapted to engage with projecting keys
rubber Il of suitable composition and uncured
or ridges i9 formed on the mould section lo. The
hardened sole and heel applied thereto in the op
erative position and the pressure plate I4 in
serted into the section IU of the mould, the co
acting section Ii! of the mould is then placed in
kcyways i3 and keys i9 are preferably made with
inter-fitting inclined cam faces so as to guide the
core into its proper position when the mould sec
tions are moved together to close the mould.
The core is then held firmly in its proper position
20 by interengagement of 'the cam faces of the keys
and keyways until the mould is opened.
Conveniently positioned on the adjacent faces
of the co-acting sections ill of the mould I pro
vide small channels 2l) which extend to the edge
25 of the mould sections Iâ] these channels 28 be
ing for the purpose of permitting the discharge
of excess material that is forced from the mould
during operation.
Vso
position where eyelets (not shown) are inserted
A separate mould may be made for each last
l2 with pressure plate ld but it is preferable to
incorporate a pair of right and left lasts I2 and
position and pressure applied thereto thereby
forcing the sole and heel pressure plate I4 down
wardly and at the same time inwardly against 20
the sole of the last i2. While the co-acting sec
tions I0 of the mould are held together under
pressure suitable fastening means associated with
said sections iii are brought into operation, the
said fastening means preferably comprising a piv 25
otal bolt 25 adapted to engage projecting lugs
26 on the opposite section Iû of the mould. The
mould is then placed in a suitable vulcanizer
pressure plates M in the one section l0 as illus
(not shown) for a period su?licient to cook the
uncured rubber Il after which the mould is re 30
moved and opened, and the core or last I2 re
moved from the vulcanized rubber shoe or boot as
trated in the accompanying drawing.
the case may be.
In building up a last I2 the said last I2 is re
35 moved from divided sections i@ of the mould
and coated with a layer of uncured rubber I1
of predetermined thickness; any portion of the
coating of rubber may be suitably covered or have
a pattern imparted thereto, a coating of rubber
The shoe is then dressed and prepared to re
move any excess material formed at the joint 35
of the mould sections i@ and suitable eyelets (not
shown) incorporated in the front of the shoe for
lacing purposes, the tongue (not shown) of the
shoe being inserted and fixed to the upper by the
40 of harder composition if desired being applied to
lower eyelets.
the sole of the last I2 for the purpose of forming
the sole and heel of the boot or shoe. The last
I2 is then placed in position in one of the corre
spondingly shaped recesses i I formed on each in
45 ternal side of the co-acting sections IE of the
mould.
The pressure plate I4 is then inserted into the
mould section I5) carrying the last l2, in the re
cess I3 directly below the bottom of the last i2
50 but owing to the thickness of the uncured rubber
Il’ this pressure plate Iii is prevented from being
correctly positioned without pressure being ap
plied thereto, but due to the taper I6 on the back
face of the pressure plate ifi the entry of said
55 plate Iii into the mould section Iâl is made pos
sible. The interaction between the inclined faces
It of the mould on the inclined faces I5 on the
pressure plate forces the pressure plate toward
In order to obtain a predetermined thickness
of the sole of the shoe varying sized pressure sole
plates I4 are provided for the purpose. DoWel
pins 2l and co-acting dowel openings 28 are also
the core member I2 as the mould sections move
60 toward each other until the pressure plate occu
pies its correct position within the cavity of the
mould.
The surface of the heel and sole plate I4 ad
jacent the bottom of the last I2 may beof de
65 sired formation according to requirements and
may have formed thereon projections 2l or the
like for imparting a desired tread on the sole of
the iînished product.
Should it be desired the heel section 22 of un
70 cured rubber El may be stamped out and placed
adjacent the heel of the last i2 prior to the in
sertion of the heel pressure plate Ill and reinforc
ing fabric (not shown) is incorporated with the
uncured rubber lll forming the upper of the shoe
75 in order to prevent fracture of the rubber at a
40
provided on the mould sections IB to ensure cor
45
rect alignment.
It will be understood that the product obtained
by the method herein described has the natural
appearance of a standard shaped last and from
appearance is identical with a leather shoe hav 50
ing a Welted sole thereon.
What I claim as my invention and desire to
secure by Letters Patent is:--
p
1. A mould for forming one-piece rubber shoes,
which comprises a pair of mould sections having 55
recesses therein cooperating to form a cavity when
the mould is closed and having core positioning
portions, and a unitary core member having a
core portion in the shape of a shoe last adapted
to be spaced from both mould sections when in 60
position in the closed mould and a positioning
portion integral with said core portion, said core
positioning portions of both the core member and
the mould sections comprising interñtting ridges
and grooves with inclined cam faces adapted to 65
move said core portion into proper position rela
tive to the mould sections when the mould sec
tions are moved together to close the mould.
2. A mould for forming one-piece rubber shoes,
which comprises a pair of mould sections having 70
recesses therein cooperating to form a cavity
when the mould is closed and having core posi
tioning portions, a unitary core member having
a core portion in the shape of a shoe last adapted
to be spaced from both mould sections when in 75
2,114,708
position in the closed mould and a positioning
portion integral with said core portion, said core
positioning portions of both the Core member and
the mould sections comprising interñtting ridges
and grooves with inclined cam faces adapted to
move said core portion into proper position rela
tive to the mould sections when the mould sec
3
tions are moved together to close the mould, and
eJ sole pressure plate in said cavity opposite the
bottom of said core, said sole pressure plate and
mould sections having coasting cam faces to force
said plate toward said core when the mould 5
sections are moved together to close the mould.
DAVID GORDON GASH.
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