Inner shoe for ski boots

The inner shoe for ski boots comprises an upper provided with a perimetral border at the end associated with an inner sole. The inner sole is furthermore provided with at least one raised portion and at least one perimetral tab facing and connected to the border of the upper. Advantageously, the central raised portion of the inner sole defines a perimetral edge having a thickness approximately equal to that of the border provided on the upper.

BACKGROUND OF THE INVENTION 
The present invention relates to an inner shoe for ski boots. 
Inner shoes are currently known which are sewn and fitted on a last; the 
assembly initially entails the perimetral sewing of an inner insole, the 
insertion of the last, the application of an adhesive and the reactivation 
thereof by heating, the glueing of an inner sole by pressing and then the 
extraction from the last. 
The main disadvantage of such known types of shoes resides in the fact that 
they have very high costs due to the various processes required, which 
increase the production times of each individual shoe. 
As a partial solution to said disadvantages, a shoe is also known which has 
a strobel sewing on the perimetral border of the sole for fixing it to the 
upper. 
Though it does not require assembly on a last, this shoe has a less than 
optimum aesthetical appearance since the sewing of the inner sole is 
visible, and the shoe itself provides poor heat insulation. 
It is furthermore noted that the sewing defines, at the joined perimetral 
borders, a sharp edge which does not allow correct adaptation to the 
interior of the shell of the ski boot. 
SUMMARY OF THE INVENTION 
The main aim of the present invention is therefore to eliminate all of the 
disadvantages of the known types of inner shoes for ski boots. 
Within this main aim, another aim of the invention is to eliminate the 
disadvantages described above in known types, by devising an inner shoe 
for ski boots which is simple, rapid and economical to manufacture and 
which simultaneously provides an aesthetical appearance comparable to 
similar shoes obtained with the above mentioned more expensive prior art. 
Within the scope of these aims, an important object of the invention is to 
provide an inner shoe for ski boots which associates the previous 
characteristics to that of providing optimum heat insulation and the 
possibility of achieving in a simple, rapid and economic manner, 
characterizing aesthetical finishings for said shoe. 
Another important object is to provide an inner shoe which furthermore 
allows an optimum adaptation to the interior of the shell of the ski boot. 
The aim and the objects mentioned above and others which will become 
apparent hereinafter are achieved by an inner shoe for ski boots, 
comprising: 
an upper having an opening at its lower end; 
a perimetral border along said opening; 
an inner sole arranged for association with said upper and having a lower 
surface facing towards the exterior of said upper; 
at least one raised portion formed centrally of said inner sole arranged 
for insertion into the inner edge of said perimetral border and with a top 
surface facing towards the interior of said upper; 
at least one perimetral tab formed in said inner sole peripherally of said 
raised portion and having an upper surface facing the inside of said 
upper; 
wherein said perimetral border projects towards the inside of said upper to 
partially occlude said opening ;and 
wherein said upper surface of said perimetral tab is facing and connected 
to the lower surface of said perimetral border. In a further aspect of the 
present invention, the inner shoe comprises: 
an upper having a lower end with a sole opening; 
a peripheral border defined along said sole opening and projecting towards 
the inside of said upper; 
an inner sole arranged for association with said upper along the outer side 
of said perimetral border; 
an insole arranged for association with said upper along the inner surface 
of said perimetral border; 
a raised portion formed centrally of said insole and shaped substantially 
complementarily to the inner edge of said perimetral border for insertion 
thereinto; 
a perimetral tab defined peripherally of said insole by said raised portion 
thereof; wherein the outer surface of said raised insole portion is facing 
and connected to said inner sole; and 
wherein said perimetral tab of said insole is facing and connected to said 
inner surface of said perimetral border whereas the perimetral edge of 
said inner sole is facing and connected to a complementarily recessed 
outer portion of said perimetral border.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
With reference to the above described figures, the inner shoe 1, 
particularly usable for ski boots, consists of an upper 2 having, at the 
end 3 associable with an inner sole 4, a perimetral border 5. 
Said perimetral border 5 protrudes approximately perpendicular to the outer 
lateral surface 6 of the upper 2, said border partially occluding the 
opening 7 provided at the end 3 of the upper 2. 
The inner sole 4, which can be moulded, heat-formed, electrically formed at 
high frequency or made by hand with the most suitable materials, with or 
without a lining, is provided with a raised portion 8 shaped 
complementarily with respect to the opening 7 defined on the upper 2. 
This raised portion 8 has a perimetral edge 9 with thickness approximately 
equal to that of said perimetral border 5, its surface 10 facing towards 
the inside of the upper 2 being possibly provided with the most suitable 
configuration depending on the structure of the foot. 
At the surface 11 of the inner sole 4 facing towards the outside of the 
upper 2, a plurality of knurlings is provided, adapted to increase the 
grip to the inside of the ski boot shell, in said inner sole there being 
defined, on the plane of arrangement of the surface 11, a perimetral tab 
12 with width approximately equal to that of said perimetral border 5. 
The assembly of the upper 2 to the inner sole 4 can occur without the 
insertion of the last, it being sufficient to insert, practically 
coupling, the raised portion 8 in the opening 7 of the upper, causing the 
perimetral tab 12 to mate with the perimetral border 5. 
The coupling between said tab 12 and border 5 can be effected for example 
with chain stitching or with another type of stitching, by means of a 
suitable sewing machine, preferably of the type having an oscillating arm 
13. The lining of the shoe on the border 5 is preferably performed with 
zig-zag stitching so as to improve the aesthetics. Naturally, the coupling 
between the border 5 and the tab 2 can be effected by glueing. 
It has thus been observed that the invention achieves the intended aims, an 
inner shoe for ski boots having been obtained which can be assembled in a 
rapid and simple manner which entails for the latter a very modest cost. 
The shoe thus obtained also has a good aesthetical appearance and optimum 
heat insulation, of a greater degree than that obtainable with known 
stitched shoes. 
The shoe is furthermore provided with a good coupling between the inner 
sole and the upper, this allowing the optimum adaptation thereof to the 
interior of the shell of the ski boot. 
Moreover, the possibility of applying to the upper's inner soles having the 
surfaces 10 and 11 with different or specific configurations, depending, 
for example, on the shape of the foot, allows the achievement of an 
optimum fit for the user, as well as a desirable aesthetical finish for 
the shoe. 
Naturally, the invention is susceptible to numerous modifications and 
variations, all of which are within the scope of the same inventive 
concept. 
FIG. 3 illustrates a further aspect of the shoe according to the invention, 
in which the edge of the perimetral border 205 of the upper 202 has an 
abutment 203 for the accommodation of the perimetral tab 212 of the inner 
sole 204. In this manner a double reference is achieved for the assembly 
of the inner sole 204 and the upper 202 and most of all both the outer 
surface and the inner surface of the shoe are absolutely free from raised 
portions. 
FIG. 4 illustrates yet another embodiment of the shoe, in which the edge of 
the perimetral border 305 of the upper 302 is also provided with an 
abutment 303. The inner sole 304, in this case, couples to the upper 302 
at the abutment 303. The inner sole comprises, inside the upper 302, an 
insole 306 having a raised portion 308 shaped complementarily with respect 
to the opening defined by the edge of the perimetral border 305 of the 
upper 302. The insole 306 can be rigidly associated with the upper in 
different manners, for example by means of a single stitching which joins 
the insole, the vamp and the insole, or by glueing or other known means. 
Advantageously, the insole 306 can be extractable from the shoe and in this 
case the sewing affects only the inner sole and the upper, and can be 
arranged inside said shoe and coupled to the upper by means of coupling 
means or simply by employing the raised portion 308 which is shaped 
complementarily with respect to the opening of the vamp. 
Naturally, all the materials, as well as the dimensions of the individual 
components, may be any according to the specific requirements.