[0001] This invention lies within the scope of the technological sector of the shoe manufacturing
industry, being particularly involved in a manufacturing process for the kind of footwear
that may either be used for sports purposes or in combination with informal dress.
[0002] Usually the manufacture of this kind of footwear first entails a vamp being made,
with a mid-sole stitched to it, then the outer surface of the mid-sole being glued
to the vamp surface of a sole made of a material such as rubber.
[0003] A stiff inner insole, made either of plastic material (synthetic resin) or of pressed
cardboard or even wood which is usually called the heel-sole is initially inserted
inside the sole in such a way as to remain close to the upper surface of the afore-mentioned
sole.
[0004] The purpose of this insole or heel-sole, extending from the area of the footwear
corresponding to the heel to just beyond the plantar arch is to make the footwear
sufficiently rigid.
[0005] The edge of the sole is then stitched to the vamp to reinforce the join between the
component parts of the footwear.
[0006] Obviously the glueing of the mid-sole with its attached vamp, to the sole will require
a series of operations that will have a negative effect upon the overall manufacturing
costs of the footwear.
[0007] The glue does, in fact, have to be applied first to the upper surface of the sole,
and then to the outer surface of the mid-sole.
[0008] In the event that the type of glue being used, might have to be heated before sticking,
then both the sole and the mid-sole with its attached vamp, will have to be placed
in a stove for a previously determined length of time.
[0009] Subsequently the vamp is positioned above the sole, and the mid-sole is subjected
to a previously determined amount of pressure so that the glue will stick efficiently.
[0010] Lastly the edge of the vamp is stitched to the upper edge of the sole, thus finally
reinforcing the joining of the latter two parts.
[0011] The disadvantages caused by the complexity of this kind of procedure are obvious,
the main ones being those of the large number of operations entailed in the process
described.
[0012] The use of glues requires sophisticated equipment that has to be especially set up
and involves many hours of work, particularly while waiting for the glue to stick
and then for it to dry.
[0013] Finally it seems obvious that once the initial join has been made with the glue,
the sole and the vamp cannot easily be separated; another negative aspect of the process
described above being the fact that it is irreversible.
[0014] The aim of this invention is to propose a manufacturing process for sports shoes,
which by virtue of its being a technical procedure that is both easy and cheap to
manufacture, consists of a series of operations that are less complicated than those
of the previously described process, thus offering considerable improvements in the
production of said articles in terms of both the time and costs involved in their
manufacture. A further aim of this invention is to propose a procedure whereby each
of the operations being carried out is reversible.
[0015] The above-mentioned aim can be achieved by a manufacturing process for footwear,
of the kind consisting of a vamp, a mid-sole attached to said vamp once its lower
part is closed, and a sole which will initially be attached to said vamp by being
joined to said mid-sole, and later on by its edge being stitched to said vamp; this
process is characterised by the fact that it entails the following operations: the
manufacture of said vamp, the manufacture of said mid-sole and said sole respectively,
complete with parts that can be matched together thus joining or separating said sole
to the mid-sole, simply by means of pressure; the attaching by stitching of said mid-sole
to said vamp; the joining by simple pressure of said sole to said mid-sole with said
vamp attached to it; and the stitching of the edge of said sole to said vamp.
[0016] Those characteristics of this invention, which do not emerge in what has just been
said, are about to receive due explanation with close reference to the enclosed drawings
as follows:
- Fig. 1 is a diagram of a vamp, a mid-sole and a sole manufactured according to this
invention;
- Fig. 2 is a diagram of the vamp with the mid-sole attached to it;
- Fig. 3 is a diagram of a completed footwear;
- Fig. 4 is an enlarged view, A, of a part of Fig. 3;
- Fig. 5 is a diagram of a vamp, a mid-sole and a sole manufactured according to a
special process which is a variation of this invention;
- Fig. 6 is a diagram of the vamp with the mid-sole attached to it as in Fig. 5;
- Fig. 7 is a diagram of the completed footwear in Fig. 5;
- Fig. 8 is an enlarged view, B, of a part of Fig. 7.
[0017] With reference to the numbers in the above-mentioned figures, number 1 indicates
the footwear that we are proposing to manufacture by this process.
[0018] Figure 1, in particular, shows a vamp 2, a mid-sole 3, and the sole 4 of the footwear
1.
[0019] The vamp 2 has been manufactured according to known procedures from leather or some
other material that is usually used in the manufacture of footwears.
[0020] According to this procedure the mid-sole 3 is obtained by placing a number of seats
6 on one of its facings, in such a way that they are uniformly distributed over the
surface of the latter.
[0021] Consequently the mid-sole is attached by stitching to the lower edge of the vamp
2 and the facing of the seats 6 faces outwards.
[0022] The sole 4 is made of synthetic resin, and is obtained by pouring this material in
the liquid state into a suitably shaped die containing a stiffened inner insole 7,
or heel-sole, made from a material such as plastic.
[0023] A strip 5, with the same surface and shape as the mid-sole 3, is then made with
the raised layers 8, on one of its facings, corresponding to the seats 6.
[0024] The seats and the raised layers may obviously take on whatever shape proves best
on each separate occasion.
[0025] An example of this can be seen in the drawings where the seats and raised layers
shown are cylindrical-shaped.
[0026] The strip 5 then becomes a single integral part of the sole 4 during manufacture
of the latter, and the facing with the raised layers faces outwards.
[0027] This may, for example, be inserted inside the die used to make the sole, prior to
pouring in the material in its liquid state, and positioned immediately above the
insole, 7.
[0028] The next stage of the procedure entails attaching the sole 4 to the mid-sole 3, and
consequently also to the vamp 2, this being done by virtue of the joining together
of the two facings of the strip 5 and the mid-sole 3 respectively, featuring the
raised layers 8 and the seats 6, by inserting the latter inside said seats 6 through
the simple exertion of pressure.
[0029] Finally the edge of the sole 4 is stitched to the vamp 2 to fix the join.
[0030] In terms of a different manufacturing process shown in figures 5-8, the mid-sole
could be made from one of the two component parts of a velcro strip fastening (this
is not shown since it is known).
[0031] As is known velcro is a material consisting of two sides, which are correspondingly
paired by simple pressure, and which is used as a means of rapidly joining together
or separating strips of cloth or similar things.
[0032] The mid-sole 13 is made by cutting a corresponding surface from one of the two component
parts of the velcro, and it is then stitched to the vamp 12, with the lower part of
the vamp closed and with the facing to be matched to the remaining part of the velcro
facing outwards.
[0033] The strip 15, on the other hand, which has the same surface and shape as the mid-sole
13, is made from the other component side of the velcro strip and becomes a single
integral part of the sole 14 during its manufacture.
[0034] The strip 15 may, for example, be inserted inside the die used to make the sole,
prior to pouring in the material in its liquid state, and positioned immediately above
the plastic insole.
[0035] The next stage of the procedure entails the attaching of the sole 14 to the mid-sole
13 and consequently to the vamp 12, attached to it, this being done by joining together
the two sides of velcro 5 forming the mid-sole 13 and the strip 15, respectively,
by simply exerting pressure.
[0036] Finally, the edge of the sole 14 is stitched to the vamp 12 to fix the join.
[0037] Obviously this means that it is possible to join the two sides of velcro in a single
operation by the cutting of the two joined parts, which can then be separated later
on.
[0038] A further manufacturing process entails the manufacture of the mid-sole and the strip
with the use of polyurethane.
[0039] The polyurethane is attached to the sole and the two parts of polyurethane are joined
together by heating the afore-mentioned parts.
[0040] The advantages of the process described above are obvious, and may be summed up as
follows:
- Rapid execution of joining operations between sole, 4, and vamp 2. The latter parts
are rapidly and securely joined together by simply attaching the mid-sole to the strip
integral to the sole, by a slight exertion of pressure. In this way the glueing operations
to the upper surface of the sole and the mid-sole are eliminated, as are the heating
operations with the sole and vamp in the oven. What is more, the need for the mid-sole
and the sole to be subjected to pressure for a predetermined length of time has also
been eliminated. All this considerably reduces the manufacturing costs of the footwear.
- Joining operations between the vamp and the sole are practical and easy to carry
out. Regardless of whether joining operations between the two parts take place with
the raised layers and their corresponding seats, or by using the velcro strip or even
with polyurethane, it is a simple operation which does not involve any complicated
equipment to apply the glue with or high temperatures before the latter will stick.
Once the sole has been attached to the vamp, they are ready for subsequent operations
in the manufacture of the footwear. Furthermore, joining operations between the sole
and the vamp are not irreversible as is the case when glue is used. This means that
the vamp and the sole can still be separated before final stitching.
- Safety. The use of glues which are often toxic, is avoided in joining operations
between the vamp and the sole.
- Economic viability. The above-mentioned advantages will directly or indirectly result
in considerable savings in the overall costs of manufacturing the footwear.
[0041] The above description is intended to be seen purely for the purposes of an example
and is not binding.
[0042] Any variations is possible in the way the procedure is carried out or in the manufacturing
process for the joining together of the sole and the mid-sole, that may, for example,
be obtained by any method of fitting them together differing from the one that has
been described.
1) Process for the manufacturing of footwear, this footwear being of the kind consisting
of a vamp (2), a mid-sole (3), attached to said vamp (2), to close its lower part,
and a sole (4), which is initially to be attached to said vamp (2) by being joined
together to said mid-sole (3), and finally by its edge being stitched to said vamp
(2); the said process being characterised in that it entails the following stages: the manufacturing of said vamp (2); the manufacturing
of said mid-sole (3) and of said sole (4) respectively comprising parts (6, 8) which
are correspondingly matched so that said sole (4) can be joined to or separated from
the said mid-sole (3) by the simple exertion of pressure; the joining together by
stitching of said mid-sole (3) to said vamp (2); the attaching, by simple pressure,
of said sole (4) to said mid-sole (3), attached to said vamp (2); and the stitching
of the edge of said sole (4) to said vamp (2).
2) Process for the manufacturing of footwear, this footwear being of the kind consisting
of a vamp (12), a mid-sole (13), attached to said vamp (12) to close its lower part,
and a sole (14) which is initially to be attached to said vamp (12) by joining it
together to said mid-sole (13), and finally by the stitching of its edge to said vamp
(12); the said process being characterised in that it entails the following stages: the manufacturing of said vamp (12); the manufacturing
of said mid-sole (13) from one of the two parts that may be correspondingly matched
together, and of a strip (15) from the remainder of said parts; the joining together
by stitching of said mid-sole (13) to said vamp (12); the manufacturing of a sole
(14) with said strip (5) attached above it; the joining together of said sole (14)
and said vamp (12) after the matching of said strip (15) to said mid-sole (13); and
the stitching of the edge of said sole (14) to said vamp (12).
3) Process according to claim 1 characterised in that said parts (6, 8) consist of a number of seats (6) made on the facing of said mid-sole
(3) that will be facing outwards, and by a number of raised layers (8) corresponding
to said seats (6) made on the facing of a strip (5) that will be facing outwards and
which forms an integral part of and will be above said sole (4).
4) Process according to claim 2 characterised in that said mid-sole (13) and strip (15) are respectively made from the two sides that make
up a velcro strip fastening.
5) Process according to claim 2 characterised in that said mid-sole (13) and strip (15) are made by using polyurethane which is heated
at the moment of the joining of said mid-sole (13) to said strip (15).
6) Footwear made according to the method described in claim 1, the said footwear being
of the kind comprising a vamp (2), a mid-sole (3), attached to said vamp (2) to close
its lower part, and a sole (4) attached to said vamp (2) by joining together with
said mid-sole (3), and also by the stitching of its edge to said vamp (2); said footwear
(1) being characterised in that the said mid-sole (3) and said sole (4) are respectively completed by parts (6,
8) which may be correspondingly matched.
7) Footwear made according to the method described in claim 2, the said footwear being
of the kind comprising a vamp (12) a mid-sole (13) attached to said vamp (12) to close
its lower part, and a sole (14) attached to said vamp (12) by joining together with
said mid-sole (13) by the stitching of its edge to said vamp (12); the said footwear
being characterised in that said mid-sole (13) and said sole (14) are respectively made up of two corresponding
parts, which may be matched together.
8) Footwear according to claim 6 characterised in that said parts (6, 8) consist of a number of seats (6) made on said mid-sole (3), and
of a number of corresponding raised layers (8) made on a facing of a strip (5) which
forms an integral part of and will be above said sole (4).
9) Footwear according to claim 7 characterised in that said parts making up said mid-sole (13) and strip (15) are respectively made of the
two sides of a velcro strip fastening.
10) Footwear according to claim 7 characterised in that said parts making up said mid-sole (13) and strip (15) are made of polyurethane.