Note: Descriptions are shown in the official language in which they were submitted.
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¦Backqround of the invention
The present invention is with respect to foo~wear with a
Il molded, as for example injection molded, outsole and having an
: I upper stitched to insole covering the top side of the outsole,
: ~ and with an outwardly running lower edge trimmed back after
molding of the outsole. The invention is furthermore with
~¦respect to a process for producing such a piece of footwear
l¦in the case of which the upper is stitched together from
I I!clicked out pieces of material, and then the insole is stitched
to the upper and, lastly, after putting on a last,the upper
~of the shoe produced on these lines has the outsole molded on
iit.
There are a number of different sorts of shoes with molded
llon soles. In the case of sorts of shoes in which the lower edge
15 ¦1 of the upper is turned inwards, as is normally the case, there
is on the one hand a shortcoming inasfar as,before molding the
sole, the upper has to be skived and rough scoured because
ilotherwise the sole will not be strongly adhesively joined to~the
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¦¦ upper. Such working steps undertaken by hand are responsible
¦ in every case for irregular processing. Furthexmore, on puttin~ ¦
on the adhesive or cement, there is the danger, if the worker
l does not take great care, of getting some of it on parts of
! the upper which are later not covered by the molded sole and
¦ any such undesired adhesive will have to be taken off later
11 (if at all possible) in a further working step. Further trouble
on producing such footwear is likely in connection with lasting:
I If the shoe top part is not completely truly and regularly
lasted, the outcome will be a lower quality.
In the prior art flexible footwear (that is to say footwear
whose outwardly turned edges of the uppers are joined to the
outsole) has been produced with molded outsoles (see German
!¦ OffenlecJun~sschrift specification 2,830,605), in ~he case of
I which a generally stiff midsole with the function of an insole
is joined to the upper at its outwardly ~urned edge and then
the ou~sole is molded on the midso:le. There are a number of
¦~ troubles wi-th such a process: On the one hand, because the mid-
~I sole is generally stiff, it is hard to get the shoe regularly
¦ lasted for molding, while on the other hand after molding the
j midsole has t~ be trimmed back together with the edge of the
¦ upper. Because the material to be trimmed here is generally
¦ thick, heavy machines have to be used for tri~min~. Furthermore,
Il scouring is frequently necessary~ On using heavy trimming
25 1¦ machines, there is the further danger of damage to specially
produced embossed patterns and a loss of ~uality in this
respect as well. Lastly, in prior art footwear with a midsole,
there is a shortcoming inasmuch as the molded on outsole is
I only adhesively joined to the midsole, that is to say the
30 ¦1 outsole is only fixed to the upper by way of the stitching
between the upper and the midsole. Such stitches are, however,
of limited strength.
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¦ General outline of the invention
One purpose of the present invention is that of designing
I a style of shoe with a molded outsole which is free of the
¦ shortcomings noted in connection with the prior art and which
¦ more specially may be regularly lasted, is responsible for a
strong adhesive joln of the outsole on the upper and makes
possible simple finishing operationson the shoe once the
¦ outsole has been molded.
l For effecting this purpose and further purposes in the
10 ~ invention, a shoe of the sort noted at the start i5 SO designed
that the insole has a size answering to the edge of the last
where the upper part of the last and the sole part of the last
come togetherl and the outer limit of the insole is fixed to
the point at which the upper and the outwardly directed edge
on the same come together,and furthermore the outsole is molded
¦directly onto a lower face of the lower edge of the upper, such
Imolding being undertaken for example by injection molding or
¦by casting,
; ~ It will be seen from this that, unlike known shoes of the
20 I flexible footwear style,in the shoe of the present invention ¦
the insole only goes as far as the line at which the upper
¦and the outwardly running edge thereon come together. This is
¦responsible for the very useful effect that the molded shoe
l sole is directly joined with the leather of the upper itself
¦ and furthermore, generally, molding is on the flesh side of
t the leather, where no roughing or scouring of the leather will
be necessaryO Nevertheless, more specially on using an adhesion
¦¦promoter, the sole will be very strongly joined adhesively to
~the outwardly turned edge or flange of the upper. After casting
)¦or molding the sole on the shoe of the present invention it is
then only necessary for the leather of the upper to be trimmed
back to si~e, a simple ~ork1ny tep only needing light tools.
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¦ Furthermore, no scouring or the like is necessary so that
there is no danger of damaging the sole. Furthermore, because
the insole only goes as far as the line where the upper and
the edge of the upper come together, there is the useful
5 ¦ effect that the size of the insole is quite the same as that
¦¦ of the last. Because of this, the shoe or other piece of
¦ footwear may be lasted very regularly for molding the outsole,
because the machine worker undertaking the lasting operation
has the chance of guiding himself exactly by the edge (normally
~0 present at the lower part of the last) limi~ing the sole face
or area. In fact, it is only necessary for the outer limit
¦ of the insole to be lined up with this edge on the last, this
¦ being a specially simple operation if the insole is made of
¦ highly flexible material with only a low dégree of stretch,
15 ¦ because if the shoe parts are wrongly lasted, it will be
¦ simple to make out the position o the last edge through the
flexible materia~. The use of the very flexible insole further-
more is responsible for the useful effect that all in all a
1¦ very flexible shoe lower part is produced, something which ¦
20¦¦ has not been true so far with all flexible footwear~ this
¦¦ being more specially because of the normally great thickness
¦¦ of the midsole and furthermore because of the frequently used
¦¦ adhesive between the insole and the midsole.
¦~ It may be seen from this that this shoes of the present
251! invention are di-fferent to prior art shoes so far inasfar as
Il they are much better(and more specially more exactly)processed
¦¦ while on the other hand offering a high degree of flexibility.
Furthermore, it is possible for a relatively large amount
~ of material be saved in respect of the midsole, because in fact
30¦¦ an insole is, in any case, normally used in addition and as
a backup.
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I The insole may be made of a number oE different ma-terials.
Specially good wearing properties are produced if the insole
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is made of leather and is backed up under it by backing
1~ material which may not be or only partly be stretched, more
~l specially textile material and which is best fixed to the full
lower face of the insole. I
l~ It is furthermore possiblel as part of the present invention, ¦
11 to have ornamental stitching at the lower edge of the upper,
¦¦ such stitching being evenly spaced from the outer limit of
~¦ ~he lower edge and only going through the upper, a special line
¦¦ of stitching running along such stitching for fixing the insole ¦
il to the upper. Such ornamental stitching may be simply produced,
makes for a good-looking shoe and, at the same time, may be
simply used as a marking for stitching the insole in position. Il
I By a careful selection of the position of the ornamental stit- ¦
¦ ching it will be covered over under the structure by the cast~-on ¦
outsole so that there is no danger of water making its way
through the stitching.
'¦ The comfort of shoes of the present invention for the wearer
20 1l may be stepped up if, in the known way, a backing, made for
example of felt, other non-woven material or the likel is put
~in posltion in the molded outsole under and next to the insole.
I This backing is responsible for specially useful effects in
llthe shoe or other footwear of the present invention because
Inormally a highly flexible insole is used.
¦~ More specially on using such a highly flexible insole, the
j molded outsole may have upwardly or downwardly curved parts
¦forming a foot seat or bed and which may be simply produced by ~1 1
¦Imolding on the outsole. For this purpose~ it is only necessary
30 1I for the lower side of the last used on casting or molding to
have inwardly or outwardly curved parts.
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¦ A piece of footwear of the present invention may be
¦ produced in a number of different ways, in which respect the
upper will be stitched toge-ther fror;lclicked pieces o~ mate- ¦
rial and then stitched to the insole, whereafter, lastly,
after lasting,the outsole is molded onto the shoe top part
so produced. In the present invention a special way of
producing such a shoe is put forward which is characterized
in that before fixing the insole in position, the stitched
together upper has an ornamental line of stitching or marking
produced marking the inner limit of the outwardly turned
edge of the upper and keeping an unchanging distance from
the outer limit of the lower edge of the upper and then the
insole is stitched to the upper by way of its outer edge
l ~long this ornamental line of stitches or marking and then
when the top part of the shoe is then put on the last, it is
so lined up in relationto the lasl that the outer edge of the
insole is running along an edge oll the sole side of the last.
Such an operation is responsible on the one hand for the
~ useful effect that the ornamental stitching or marking may
201¦ be produced at quite the desired positionl that is to say
¦¦ so as to bQ dependent on the position of the limit of the
I¦ lower edger because the limit o~ the lower edye is produced
Ii by the stamping cut quite exactly. ~long the ornamental
¦I stitching or marking, the insole may then be quite exactly
25¦l stitched into position without any trouble. The stitched-in
¦ insolel together with the limit at the lower side of the last
~ then makes possible trouble-free and completely regular lasting
¦ of the top part of the shoe for molding so that the molded
¦ outsole will be seated in generally ~uite the same position
30 ¦ on the upper or top shoe part on each and every shoe or
other piece of footwear produced.
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List of fiqures and detailed account of workinq example
¦ of the invention
Further detailst developments and useful effects of the
invention will be seen from the account now to be given of
one preferred working example of a piece of footwear - in
the present case a shoe as part of the invention.
Figure 1 is a cross-section through the vamp part of a
l shoe of the present invention and the ~old used
I I for producing it.
1011 Figure 2 is a cross-section on the same lines as figure 1 -~
j' after the shoe has been taken from the last and
trimmed to size.
The shoe of the present invention has, as will readily
be seen from figure 1 t a normal upper 1 at whose lower end
151 an insole 2 is stitchedt there furthermore being a backing 3, ¦
for example of felt, other non woven material or the like,
¦ and a molded (in the present case,cast) outsole 4.
¦~ As is the case with the prior art flexible shoes, the
~¦ upper 1 has an outwardly turned lower edge 5 or flange which,
20 I in the present working example, has two ornamental Iines of
stitching 6 only running through the lower edge 5. However,
j the stitching may be generally coarse.
¦¦ The insole 2 is in the shoe of the present inve~tion only
¦¦ of such a size that its outer limit 7 ls at the position a
251'1 where the upper 1(in the limited sense of the word)and the
lower edge 5 come together. In other words,it is at the
transition between upper and upper edge. The insole is stitched
¦ along its outer limit 7 by stitching 9 to position 8 where
Il the upper 1 and the lower edge 5 come together and the stit-
30 ching 9 ~a, may be seen from figure 2 ) i ~ lin d up as 'ruly as
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¦¦ possible on the shoe outer face with the inner stitching
¦ of ornamental stitchings 6
Insole 2 is made up of a material which, while being asflexible or soft as possible, is not able to be stretched,
and for example may be made up of a top piece of leather
¦ backed up with non-stretch material under it, as for example
textile materialr the backing of textile material being
l joined with the top leather over its full lower side.
¦ It will furthermore be seen from the figure that the
molded outsole 4 has a specially formed top side acting as
a foot seat or bed in which respect there is only one upwardly
curved part 10 like a ball.
¦ It is furthermore to be noted that the edge 5 of the
upper 1 in the shoe of the present invention is placed right
against the material of the molded (for example CASt) outsole
4. The outcome of this is that the outsole 4 may readily
be joined without any trouble to the lower side 11 of edge
5 and, for this reason, with the rest of the upper 1. On the
l one hand, the lower side 11 of edge 5 is normally in any case
20 ¦¦ rough, because it is normally the flesh side of the material.
¦ On the other hand r without any danger of fauling the upper
¦ over the part onto which the sole is to be moldedl the lower
fac'e 11 of the edge 5 may be skived or coated with a substance
l for promoting adhesion.
25 1 It will be seen from the account giverl so far that the
shoe of the present invention makes do without any midsole
at all so that it is very much more flexible than known flexible
shoes and on the other hand the adhesion between the upper and
the outsole is increased: in point of fact,in known shoes of
the present sort, the join between the sole and the upper is
11 only produced by way of the stitching between the midsole and
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I the upper.
Il An account will now be given of way of producing the
¦! shoe of the present invention.
ll Firstly the upper 1 is produced by stitching together
¦l its separate stamped-out parts, the edge S, as may be seen
from figure 1, being made somewhat broader than is in fact
necessary, having in mind the form of the completed shoe
(figure 2). Nextly, at least one line of ornamental stitching
¦ 6 - or possibly only a marking - is produced running parallel
10 II to the outer limit 12 of edge 5 on the upper 1; ornamental
st-~tching may for example be produced using a foot with a
¦¦ stop. Then a stamped or clicked out insole 2 is stitched
along its outer limit 7 in the stitched-together, formed
upper in such a way that the line 9 of stitching is run exactly
15 l¦ along one of the lines 6 of ornamental stitching, which, at ~ -
Il this stage, has the function of a marking, or the stitches
¦¦ are produced along a special marking. The shoe top part so
produced and made up of the upper l and insole 2 is then put
I¦ on a last 13 (figure 1~, having on its lower side inwardly ¦
20 ~¦ and outwardly curved parts 14 fox making the desired form
of foot seat or bed. On placing the top part 1 and 2 on the
last 13, care has to be taken to see that the outer limit 7
¦¦ of the insole 2 is completely parallel to the lower edge 15, ¦
¦l which is normally present on a last, as will be clearly seen
1 in figure 1. The shoe top part now on its last is then placed
in a mold, whichr as may be seen from figure 1, is made up
of two moving side parts 16 and 17 and a vertically moving
floor part 18 and two side keepers 19 and 20. The motion of the
!I mold parts isl in this respect, such that the floor part 18
30 1' is moved upwards, after the last 13 has been put in the mold,
into the position of figure 1 and at the same time side parts
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16 and 17 are moved inwards, the edge 5 having its part runnin~
I¦ out past the outsole 4 resting on the top of the side parts
!¦ 16 and 17. Lastly, -the side keepers 19 and 20 are then moved
Il into the position to be seen in figure 1, only one ~otion in
5 ¦1 a downward direction or a mixed motion downwards and inwards
taking place. A mixed motion inwards and downwards is best,
because in this case the top shoe part 1, 2 on its last may
be more simply moved into the mold. ~fter shutting the mold,
by way of a pipe (not fisured) the material for the outsole,
as for example polyurethane or vinyl foam material is injected
or teemed into the mold space 21 where it is cured or, if
necessary, foamed. Before moving the last 13 with the shoe top
part made up of the upper 1 and the insole 2, into the mold,
l it is furthermore possible for a backing 3 to be placed on the
1 insole and fi~ed in position in some way or other, for e~ample
by way of adhesive which is only put on in dots. Once the
outsole 4 is hard enough, the mold :is opened and it is then
¦ only necessary for the parts of the edge 5 running out past
¦I the outer limit 22 of the sole 4 to be trimmed back, for example
j using a knife so that the shoe is then completed.
~ hen the material for forming the outsole 4 is run into
the mold hollow 21, it has the effect of forcing the backing
3 and, for this reason, the insole 2 against the lower side 23
Il of last 13 so that any inwardly and outwardly curved parts of
1! the last lower side will be responsible for forming e~ual and
Il opposite curved parts on the top side o~ the outsole 4.
¦I For getting better adhesion of the outsole 4 on the edge 5,
the same may be produced with an adhesion promoter or adhesive
I on its lower side before shutting the mold.
¦1 It is lastly to be pointed out that the outsole 4 can
naturally enough be of any desired design, it only being
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¦¦ necessary for the inner walls of the mold hollow 21 to be
! given the necessary form. For example the outer limit 22
~l of the sole may be profiled without any chance of damage
I¦ because after taking the outsole from the mold, only a
5 ¦I generally thin and soft outwardly running strip has to be
cut of the edge 5 of upper 1. Furthermore, with respect
. ¦ to the mold, the figures are naturally only diagrammatic
and details of the mold design will be dependent on the
special form of the upper and the sole. ¦~
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