Waterproof shoe with sole or mid-sole formed on upper

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a waterproof shoe having an outsole or a midsole molded into the instep.

【0002】

[Conventional technology]

The outsole or undersole is properly attached to the insole of the assembly by stitching and against the instep (with a functional waterproof and breathable membrane lining) that fits the instep fixed shoe last. Direct injection molding to produce fully waterproof shoes is already known in the shoe manufacturing industry.

【0003】

In this configuration, there is a problem that the stitch for connecting the insole and the insole penetrates the functional membrane, so that the membrane allows water to permeate and impairs waterproofness.

【0004】

To solve these problems, the EP298360 has a breathable instep that is internally bonded to a lining that has a membrane that is permeable to vapors and impermeable to water, and an insole that is peripherally bonded to the instep and lining. , And a shoe made of a water-impermeable material and composed of an outsole that is injection-molded around the lower part of the insole and the instep end.

【0005】

The lower edge of the lining projects further below the instep, in which the instep is sewn to the instep on one side and to the insole and lining on the other side (a porous coupling member ( Especially mesh).

【0006】

As described above, since the material of the connecting member is porous, the outsole material, which is a liquid at the time of injection molding, can soak into all the stitch holes and close them.

【0007】

Usually, a polyester mesh band is used as the material of the connecting member. Such bands are almost inelastic and therefore cannot be fully stretched, especially at the heel and toe of the shoe.

【0008】

This is an obstacle in manufacturing and causes a lack of uniformity with subsequent channel formation and a lack of waterproofness, especially in the injection molding process.

【0009】

Shoes disclosed in US 5,505,011 are also known.

【0010】

The shoe has a breathable instep that is internally bonded to a lining with a vapor-permeable and water-impermeable membrane, and is sewn to the lower edge of the lining at the periphery and projects below the instep. It consists of an insole and an outsole made of a water-impermeable material that is injection molded around the lower part of the insole and the instep and lining edge areas.

【0011】

The lining and instep are glued together at their edge areas.

【0012】

This shoe is difficult to manufacture because the lining and instep have different elasticity, which leads to the formation of unpleasant wrinkles.

【0013】

In addition, problems related to lack of waterproofness have been pointed out. This is due to the inability of the instep to adhere at the same height along the entire perimeter of the lining.

【0014】

[Problems to be Solved by the Invention]

An object of the present invention is to provide a waterproof shoe in which an outsole or a lower sole is molded with respect to an instep cover. As a result, the above-mentioned inconvenience of the prior art is eliminated.

【0015】

An object of the present invention is to provide a shoe that has either a waterproof outsole or a waterproof and breathable outsole and can be conveniently manufactured.

【0016】

Another object of the present invention is to provide shoes of the same type that can compete with known shoes in terms of cost.

【0017】

[Means for solving problems]

The present invention is impervious to water, a breathable instep that internally binds to a lining with a membrane that allows vapors to permeate and does not allow water to permeate, and an insole that binds to the instep and the lining at the periphery. It consists of an outsole or bottom that is made of material and is injection molded directly around at least the perimeter of the bonded instep, lining and insole edge region, where the lower edge of the lining is from the instep. Also projecting downwards, the instep is replaced by a coupling member in the lower region, the coupling member consisting of a waterproof material that is adhesively compatible with the molding material of the outsole or bottom, and on one side. Provided are waterproof shoes characterized in that they combine with the instep and with the insole on the other side.

【0018】

The bonding element is composed of a sheet consisting of at least two layers, the first layer is made of a material that is on the lining side and is capable of sealing the membrane, and has a melting point lower than the temperature generated during molding. However, the second layer is made of a material compatible with the material of the fabric or outsole and has a higher melting point than the first layer to avoid melting caused by heat application during the process of manufacturing the upper part of the shoe. May have.

【0019】

The connecting elements may be stitched to the instep, the lining and the assembling bottom.

【0020】

The outsole is a composite with inserts that are individually formed and located at least on the toes, which are permeable to vapor with a packed bed made of a breathable material such as felt or porous material. A film that does not allow water to permeate, a protective layer that binds to the film and is made of a hydrolysis-resistant, water-repellent, breathable or porous material, and a ground plate having a through hole between the protective layer and the ground region are laminated. The membrane and the peripheral edge of the protective layer are sealed with a polyurethane mass of a ground plate, the outsole surrounds the insert, and the injection-molded portion that tightly binds the insert to the instep. Further constituent members may be provided.

【0021】

The outsole may consist of a single block of plastic material injection molded onto the instep. The outsole may consist of a ground plate that is bonded to the instep cover by injection molding at least one individually formed coupling bottom.

【0022】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the invention will be described based on the examples shown in FIGS. 1 to 3. As shown in FIG. 2, the shoe 10 comprises, for example, a breathable instep 11 made of unpigmented natural leather. The instep 11 includes a membrane 13 (usually foamed polytetrafluoroethylene) that is arranged on one side of the instep 11 and is permeable to vapor and impermeable to water, and a pad layer 14 (for example, open cell material or felt). , Combined with the inner fabric 15 and the laminated lining 12.

【0023】

Also, the lining 12 may lack at least one of layers 14 and 15 and / or may have layers of different materials.

【0024】

The lining 12 is bonded to the instep 11 by local adhesion so that breathability is not diminished through the membrane 13.

【0025】

The shoe 10 also includes an assembly insole 16 (preferably formed from a breathable or porous material such as woven, leather, felt, cellulosic material). It is peripherally coupled to the instep 11 and lining 12 as detailed below.

【0026】

The shoe 10 further includes an outsole, as shown by reference number 19 in FIG. This is described in detail below. The outsole 19 is injection molded directly around at least the edge region of the instep 11, and is formed of a material such as polyurethane at least in the region.

【0027】

As shown in FIG. 1, the lower edge of the lining 12 projects further downward than the instep 11. In this region, the instep 11 is replaced by the coupling member 20 (for sealing the membrane 13). The coupling member 20 is non-water permeable, coupling to the instep 11 on one side and to the insole 16 and lining 12 on the other side, making it compatible with respect to the adhesive bonding of the outsole 19 to the molding material. Formed of material.

【0028】

The bond is made by stitch seams 17 and 18. The seam 18 existing between the member 20, the lining 12 and the insole 16 is of the so-called Strobel type.

【0029】

As shown in FIG. 3, the connecting member 20 is composed of two layers of sheets. The first of the two layers, indicated by reference number 21, is on the lining 12 side and is made of a material that can seal the membrane 13 (eg polyurethane). The melting point is lower than the temperature during molding (80-100 ° C), for example about 60 ° C.

【0030】

The second layer 22 can be made of a woven or polymer compatible with the material of the outsole 19. Since it has a melting point higher than that of the first layer 21, it does not melt during the process of forming the upper portion of the shoe 10 with a last (not shown).

【0031】

The first layer 21 can be melted and bonded to the membrane 13 in such a step and in the step of actually injection molding the outsole 19.

【0032】

When the outsole 19 is injection molded, the pressure and heat of the molten polymer propel it to partially melt the member 20, especially the first layer 21, seal the lining 12, and the shoe 10 To be completely waterproof.

【0033】

Here, the outsole 19 is a composite. This is because it has insert 23 (formed separately). The insert 23 is located at least in the toe portion, and has a packed bed 24 made of a breathable material such as felt or a porous material, a membrane 25 that allows vapor to permeate and does not allow water to permeate, and a hydrolysis resistance that is bound to the membrane 25. A protective layer 26 made of a material having water repellency, breathability or perforation, and a grounding plate 27 having a through hole 28 between the protective layer 26 and the grounding region are laminated.

【0034】

The peripheral edges of the membrane 25 and the protective layer 26 are conveniently sealed by a polyurethane mass of the ground plate 27.

【0035】

The outsole 19 further includes a member 29 that surrounds the insert 23 and constitutes an injection molded portion that tightly couples the insert 23 to the instep 11.

【0036】

As a matter of course, when waterproofness is required only for the outsole 19, the outsole 19 may be formed of a single block of a plastic material such as polyurethane and injection molded with respect to the instep 11. Alternatively, it may be composed of a ground plate which is individually formed and is bonded to the instep 19 by injection molding of at least one connecting lower base.

【0037】

The shoe is perforated and / or breathable and is completed by, for example, an insole 30 made of leather. As described above, a shoe in which problems in the known technique are eliminated can be actually obtained.

【0038】

The shoe 10 is completely waterproof and is breathable in the area of the instep 11 and in the lower edges of the instep 11 and the lining 12, and in this case also in the ground plate 27. The outsole 19 is made of polyurethane (by the seal provided by at least partial melting of the coupling member 20 and the corresponding portion of the outsole 19 and / or the membrane 13), but in other cases when simple waterproofing is preferred. Alternatively, it may consist of a single block of other suitable plastic.

【0039】

[Effect of the invention]

According to the present invention, there is provided a waterproof shoe in which the outsole or the lower sole is molded so as to be waterproof and breathable with respect to the instep cover.

[Simple explanation of drawings]

[Figure 1]

In the present invention, it is an enlarged cross-sectional view of the state in which the components of the shoe before molding the outsole are combined.

[Figure 2]

It is an enlarged sectional view of the finished shoe of this invention.

[Fig. 3]

It is a detailed sectional view of one component of FIG.

[Explanation of symbols]

10 shoes 11 Instep 12 lining 13 membrane 14 pad layer 15 Internal fabric 16 insole 17 stitch seams 18 stitch seams 19 outsole 20 Joining member 21 First layer 22 Second layer 23 Insert 24 Filled layer 25 membrane 26 protective layer 27 Ground plate 28 Through hole 29 parts 30 insoles